The document discusses coal mill/pulverizers used in thermal power plants. It describes how pulverized coal is dried, ground, circulated, and classified within the mill to produce a fine powder that is then transported to the boiler burners. The main types of pulverizers discussed are ball tube mills, bowl mills, ball and race mills, and hammer mills. Key components like classifiers and grinding rolls are also explained. Condition monitoring, inspection, and test procedures help ensure the pulverizers operate efficiently to grind coal into a fine powder to fuel the boilers.
The document provides information on assessing the energy performance of boilers through testing. It discusses how boiler efficiency and evaporation ratio can decrease over time due to various factors like poor combustion, fouling, and deteriorating fuel/water quality. The purpose of performance testing is to determine the actual efficiency and compare it to design values in order to identify areas for improvement. Both direct and indirect testing methods are described as well as the necessary measurements, instruments, standards, and considerations involved in conducting the tests. Formulas are also provided for calculating efficiency using the indirect method by establishing heat losses from the boiler.
This document provides an overview of steam turbine maintenance for new executives. It covers the basic working principles of steam turbines, including how they convert high pressure steam into rotational energy. It also describes different turbine types like impulse and reaction turbines. The document outlines key components like blades and discusses velocity compounding. It details various losses in steam turbines and maintenance best practices for bearings, lubrication, alignments and other aspects.
Unit lightup synchronisation & shutdownNitin Mahalle
This document provides information about the start-up process for a 660 MW power generating unit at Adani Power Limited in Tiroda, India. It discusses the key steps in preparing boiler and turbine systems, warming up and rolling the turbine, synchronizing with the grid, and gradually loading the unit to full power. The start-up involves flushing the boiler, lighting the furnace, warming casings, rolling the turbine to operating speed, switching over steam flows, and cutting in coal mills in stages to ramp up load. Critical parameters are monitored at each stage to ensure safe and efficient start-up of the unit.
An air preheater is a heat exchanger that heats incoming combustion air by transferring heat from the flue gases before they are exhausted to the atmosphere. This improves boiler efficiency. There are two main types: recuperative, which uses stationary heat transfer surfaces, and regenerative, which uses rotating heat transfer surfaces. Proper operation and maintenance is important to minimize issues like air leakage, erosion, corrosion, plugging, and fouling that can reduce the air preheater's effectiveness over time. Regular inspection and cleaning helps maintain high performance.
1. Supercritical boilers operate above the critical pressure of water (221 bar), where there is no distinction between water and steam.
2. Operating above the critical pressure provides benefits like higher cycle efficiency, lower fuel consumption and emissions, and improved load change flexibility compared to subcritical boilers.
3. The key difference between subcritical and supercritical boilers is that supercritical boilers are drumless, with evaporation occurring in a single pass and flow induced by the feed pump rather than natural circulation.
The document discusses the key benefits and evolution of circulating fluidized bed combustion (CFBC) boiler technology. It provides details on the design and operation of CFBC boilers, including their furnace design, U-beam particle separator system, convection pass, and improved performance from two-stage particle separation. CFBC boilers offer benefits like high combustion efficiency, fuel flexibility, compact design, low emissions, and reduced maintenance costs compared to earlier boiler technologies.
Bowl Mill is driven by AC motor, coupled with flexible coupling to the worm shaft. The worm shaft drives worm gear, mounted on the Main Vertical Shaft. A bowl mounted on the top of the shaft rotates at a speed of 40 to 65 rpm. Hot primary air for drying and carrying pulverized coal, enters through insulated Mill side and Liner Assembly.
This document discusses heat rate audits in thermal power plants. It aims to identify causes of efficiency losses that increase heat rate. Some key points:
- Heat rate is the amount of heat input (fuel) required per unit of power generated and impacts generation costs. Lower heat rates reduce costs.
- Losses occur in the boiler, turbine, condenser/feedwater systems, circulating water system, and from electrical/steam auxiliaries.
- Common causes of higher heat rates include incomplete combustion, turbine erosion, condenser tube fouling, and electrical auxiliary inefficiencies.
- Tracking plant parameters and conducting monthly performance tests can identify losses and guide improvement efforts to lower heat rates.
Feedwater heaters are used in thermal power plants to pre-heat feedwater and improve cycle efficiency. They extract steam from various turbine stages and use it to heat incoming feedwater in stages. This reduces the amount of heat needed in the boiler and lowers the condenser pressure, improving efficiency. Feedwater heaters come in low-pressure and high-pressure varieties and utilize extracted steam in shell-and-tube or open heat exchangers. Their performance impacts the overall plant heat rate and emissions. Maintaining optimal temperatures and addressing issues like fouling or leaks is important for efficiency.
A boiler is a device that generates steam by transferring heat from burning fuel to water. There are two main types: fire-tube boilers where hot gases pass through tubes surrounded by water, and water-tube boilers where water passes through tubes surrounded by hot gases. Boilers have many applications including power generation, heating, and industrial processes. Key factors in boiler selection include required steam properties, size, cost, and fuel/water availability. Boilers are also classified based on design features such as tube layout, firing method, pressure, and circulation.
This document summarizes a student's study of the boiler system at the NTPC Ramagundam thermal power station in India. Key points:
- The study examines how coal is combusted in the boiler to generate high-pressure steam, which is then used to power turbines and generate electricity.
- The NTPC plant uses high-pressure water tube boilers fueled by pulverized coal. It can generate 2600MW of power through 7 generating units.
- Boiler components like water walls, drums, and superheaters are discussed. Steam is generated at high pressures and temperatures before powering turbines.
- Boiler reliability is critical but failures can occur due to issues like poor design
The document provides details about the cooling and sealing system of a 247MVA turbo generator. It describes the generator specifications including rating, connection type, phases, rated speed, and insulation class. It then summarizes the need for generator cooling using hydrogen gas and water to minimize heat and ensure uniform temperature distribution. The rotor and stator cooling systems are explained along with specifications. Finally, the generator sealing system is outlined, which uses seal oil to prevent hydrogen leakage and maintain differential pressure between the oil and hydrogen.
This document discusses various operational aspects and emergencies that can occur in an atmospheric fluidized bed combustion (AFBC) boiler. It outlines important parameters to monitor such as bed height, air pressures, temperatures, and fuel sizes. It then describes several emergency conditions that can happen including low or high drum levels, high furnace pressure, high or low bed/furnace temperatures, tube failures, and flame failures. For each condition, it discusses potential causes, effects on the boiler, and recommended actions to address the problem.
The document discusses the components and operation of coal feeders and coal mills used in coal-fired power plants. It describes the technical details and constructional features of the coal feeder, which uses a gravimetric feeder to continuously weigh and proportionally control the rate of coal fed. It also details the components and functioning of bowl mills, which pulverize raw coal through centrifugal force and grinding rolls. The primary functions of the coal feeder and coal mill are to accurately meter and pulverize coal for efficient combustion in the plant boilers.
The bowl mill uses a motor and gear system to rotate a bowl at 40-65 rpm, grinding coal into a fine powder. Hot air enters to dry the coal while heavier debris falls out of the bowl. A grinding roller assembly applies pressure and can be adjusted, while vanes inside separate finer particles from coarser ones that are returned for further grinding. Discharge valves on top can isolate the mill from the boiler for maintenance.
The document summarizes the key components and working principle of a gas turbine power plant. It discusses how air is compressed in the compressor and mixed with fuel in the combustion chamber. The hot gases produced are used to power the turbine, which drives the generator to produce electricity. Around 66% of the power generated is used to run the compressor, with only 34% available for power generation.
importance of coal handling system, necessity and requirement of coal handling system, various transportation means, methods and equipment's, advantages and disadvantages of various methods, coal unloading videos.
This document provides information about the boiler drum and its functions:
1. The boiler drum separates steam and water mixtures, stores water, and reduces dissolved solids in steam through blowdown. It contains internals like turbo separators and screen dryers for separation.
2. The drum connects to downcomers, risers, feed lines, and superheater lines. Auxiliary lines include blowdown, chemical dosing, and instrumentation.
3. Proper fitting and alignment of internals is important for efficient steam separation and prevention of impurity carryover into steam.
This document discusses coal handling and combustion in thermal power plants. It begins by describing the different types of coal and methods of coal analysis. It then covers various aspects of coal handling including transportation, unloading, storage, and in-plant transfer systems. Specific equipment for crushing, conveying, and elevating coal are explained. The document concludes with a discussion of coal storage, preparation plants, and solid fuel combustion using different types of stokers.
Ash Handling System of a Thermal Power PlantAmay Jain
This document describes an ash handling system in a thermal power plant. It discusses the different components of the system including the bottom ash handling system, coarse ash handling system, fly ash handling system and ash slurry disposal system. Ash is generated during coal combustion and constitutes 30-40% of the total coal consumption. The ash handling system ensures the ash is properly managed, utilized or disposed of.
1. Pulverized coal is the most efficient way to burn coal for steam generation as it burns like gas and is easily ignited and controlled.
2. Pulverizers receive raw coal and pulverize it through processes of drying, grinding, circulation, and classification. Grinding occurs through impact, crushing, and attrition. Circulation air removes heavy particles and classification separates oversized particles.
3. Performance is measured by fineness, grindability, rejects, and capacity. Fineness indicates quality and is measured by particle size distribution. Grindability depends on coal properties like hardness. Rejects indicate foreign materials. Capacity depends on grinding mechanism and conditions.
classifications and working of mills in a power plantVVDVARAPRASAD
This document discusses coal flow and pulverization in a thermal power plant. It describes the role of different components like crushers, mills, and furnaces. It explains why pulverized fuel is used and classifications of mills based on speed. The key types of coal pulverizers - tube/ball mills, vertical spindle mills, and impact mills - are outlined. Performance indicators for mills include meeting load, achieving fineness, minimizing current/rejects, and balancing air/fuel flows.
This document discusses factors that affect mill performance in coal power plants. Key factors include input coal quality parameters like calorific value, volatile matter, moisture content, hardness, and silica/quartz content. Other important factors are the condition of grinding elements and operating parameters such as mill outlet temperature, primary air flow, mill differential pressure, and mill current. Maintaining these factors within design limits optimizes mill loading capacity and improves combustion stability and efficiency.
The document discusses the fuel firing system for boilers. It describes the fuel oil system and its components like fuel oil pumps, oil heaters, and filters. It also discusses atomization and different types of oil burners. Coal pulverizers like tube mills, bowl mills, and impact mills are described along with their components and operating principles. The importance of grindability index (HGI) in determining pulverizer performance is highlighted. Fineness is also discussed as a measure of pulverizer performance.
Zhengzhou Hengyang Industry Co., Ltd provides services related to rotary kiln systems for sponge iron production. They specialize in designing, manufacturing, installing, and providing operational support for rotary kilns and related equipment. The company offers training programs and innovative solutions to help plants reach their full potential. The document describes the raw material requirements, manufacturing process, and basic components involved in a typical coal-based rotary kiln system for producing sponge iron.
The document discusses the sintering process used at the Rourkela Steel Plant in India. It describes how iron ore fines, limestone, dolomite and other raw materials are blended and formed into nodules. These nodules are then processed through a sintering machine, where combustion of coke forms sintered agglomerates. The sinter is cooled, crushed, and screened before use as a raw material input for blast furnaces. Key aspects of the sinter plant like the mixer, nodulizer, sinter machine, cooler and screens are explained. Parameters that affect sintering quality like raw material chemistry and size, moisture content, and suction pressure are also summarized.
Nuvoco Vistas Corp. Ltd. (formerly Lafarge India Limited) has an established presence across all
major cities and towns in India. We respond to the needs driven by our customers, business
associates, shareholders, regional authorities and local communities. With our specialist solutions
under Cement, Aggregates and Concrete; we aim to enable and empower customers by bringing
innovation and ensuring sustainability to their construction.Nuvoco Vistas Corp. Ltd. (formerly Lafarge India Limited) has an established presence across all
major cities and towns in India. We respond to the needs driven by our customers, business
associates, shareholders, regional authorities and local communities. With our specialist solutions
under Cement, Aggregates and Concrete; we aim to enable and empower customers by bringing
innovation and ensuring sustainability to their construction.Nuvoco Vistas Corp. Ltd. (formerly Lafarge India Limited) has an established presence across all
major cities and towns in India. We respond to the needs driven by our customers, business
associates, shareholders, regional authorities and local communities. With our specialist solutions
under Cement, Aggregates and Concrete; we aim to enablesustainability and empower customers by bringing Nuvoco Vistas Corp. Ltd. (formerly Lafarge India Limited) has an established presence across all
major cities and towns in India. We respond to the needs driven by our customers, business
associates, shareholders, regional authorities and local communities. With our specialist solutions
under Cement, Aggregates and Concrete; we aim to enable and empower customers by bringing
innovation and ensuring sustainability to their construction.Nuvoco Vistas Corp. Ltd. (formerly Lafarge India Limited) has an established presence across all
major cities and towns in India. We respond to the needs driven by our customers, business
associates, shareholders, regional authorities and local communities. With our specialist solutions
under Cement, Aggregates and Concrete; we aim to enable and empower customers by bringing
innovation and ensuring sustainability to their construction.Nuvoco Vistas Corp. Ltd. (formerly Lafarge India Limited) has an established presence across all
major cities and towns in India. We respond to the needs driven by our customers, business
associates, shareholders, regional authorities and local communities. With our specialist solutions
under Cement, Aggregates and Concrete; we aim to enablesustainability and empower customers by bringing
innovation and ensuring sustainability to their Nuvoco Vistas Corp. Ltd. (formerly Lafarge India Limited) has an established presence across all
major cities and towns in India. We respond to the needs driven by our customers, business
associates, shareholders, regional authorities and local communities. With our specialist solutions
under Cement, Aggregates and Concrete; we aim to enable and empower customers by bringing
innovat
This document discusses analysis of pulverizers used in coal power plants. There are four main types of pulverizers that use different grinding mechanisms to reduce coal size. Proper pulverizer sizing is important to match capacity with furnace and mill sizes for different coal properties. Classifiers are also discussed which help ensure the optimal particle size distribution by returning oversized particles for further grinding while allowing undersized particles to the burners. Transport of pulverized coal involves considerations around carrier gas velocity, particle terminal velocity and concentration to avoid settling in the pipes.
This document provides information about the sintering process used in iron and steelmaking. It defines sintering as the agglomeration of iron ore fines into a porous mass through controlled combustion. It describes the main components and sections of a sinter plant, including raw material preparation, stockpiles, sinter machines, and product screening. It also explains the principles of sintering, where a permeable iron ore and additive mix is ignited to fuse particles together into agglomerates through heat generated within the mix.
The document discusses sinter making technology used in iron ore mining. It describes how iron ore fines generated during mining cannot be directly charged in blast furnaces due to size restrictions. Sintering is used to agglomerate the fines into a porous mass that meets size requirements. The key steps in sinter making include: 1) raw material preparation through crushing, mixing and granulation to produce a homogeneous mixture, 2) ignition of the mixture on a traveling grate where combustion of fuel preheats and agglomerates the fines into sinter.
This document provides design details for the pulverized coal preparation system for the IL&FS Cuddalore Power Project in India. It describes the system layout including 7 medium speed mills, 7 coal bunkers, and coal feeders for each boiler. It outlines the design criteria for mills, bunkers, feeders and explosion prevention. Calculations show the system can achieve 100% load with 5 operational mills for design coal and 6 mills for worst coal.
This document provides information about cement, including its chemistry, composition, types, manufacturing process, and key equipment used. Cement is made by heating limestone and other materials to form clinker, which is then ground with gypsum. The main steps are mining raw materials, crushing, grinding to a raw meal, pyroprocessing to form clinker, and final grinding of clinker to cement. Key equipment includes raw mills, kilns, preheaters, and ball mills.
This document summarizes a summer internship project on pollution from coal-based DRI plants. It provides background on DRI production, noting it is a method to produce solid iron from iron oxide without coking coal. DRI production in India has increased significantly in recent years. The document outlines the DRI process and inputs/outputs, identifying particulate matter, SO2, NOx, and CO as main pollutants. It discusses regulatory air pollution standards and water usage at DRI plants. In summary, it analyzes pollution sources from coal-based DRI production and the impact on the surrounding environment.
Pelletization of iron ores and the type of wear liners used in thier eqipmentsGulshan Kumar Singh
Now a days about 60% of iron ore converted to fines during mining, handling and transporting so pellet is a process of utilizing iron ore fines up to size of 0.15 microns. i investigate its process,equipment used in process, wear and other problems in them and its future scope
The document discusses stone mill/stone powder grinding mills which are used to finely grind materials with hardness less than 6 on the Mohs scale and humidity less than 6% into powders ranging from 325-3000 meshes. The mills can grind over 200 materials and have capacities from 0.4 to 12 tons per hour depending on the final size. They are more efficient than other mills, have longer lasting parts, are safe and reliable, can flexibly adjust the fineness of powders, and help reduce dust pollution and noise.
This document discusses properties of coal that are important for combustion, including swelling index, grindability, weatherability, sulfur content, heating value, and ash softening temperature. It then covers different methods of coal firing in steam power plants, including hand firing, stoker firing (overfeed and underfeed systems), and pulverized coal firing. Key advantages and disadvantages of different stoker types like chain grate, spreader, single retort, and multi-retort stokers are highlighted.
The document discusses factors that affect the generation of sinter return in the sintering process. It states that sinter return depends on the quality of input materials and the sintering process itself. The quality of input materials includes physical characteristics like particle size distribution and chemical characteristics of the iron ore fines. Maintaining the quality of inputs as per norms can minimize sinter return generation. The sintering process can also affect return generation if conditions like alumina content are not optimal. Proper particle sizes distribution of inputs and maintenance of good combustion in the sintering process help reduce return generation.
Similar to Coal mill pulverizer in thermal power plants (20)
The Sukhoi Su-35 is a heavily upgraded Russian multirole fighter jet based on the Su-27 Flanker design. It has enhanced avionics, radar, weapons, and engine capabilities that allow it to detect and engage multiple aerial targets simultaneously out to ranges of 400km. The Su-35 carries a large payload of air-to-air and air-to-ground weapons on 14 external hardpoints and has an internal 30mm cannon. It is powered by two upgraded AL-41F1S turbofan engines with thrust-vectoring capabilities.
The Tejas is India's indigenous light combat aircraft developed to replace the aging MiG-21 fighters. Key points:
- The Tejas is a single engine, single seat, highly maneuverable supersonic fighter aircraft.
- It has modern avionics including a glass cockpit and an active electronically scanned array radar.
- Variants include the Tejas Mk1, Mk1A, Mk2 for both air force and navy use, as well as trainers.
- The Tejas is intended to meet India's needs for an affordable, modern multi-role tactical fighter aircraft. Large-scale production of upgraded variants is planned to equip multiple air force squadrons.
Steam traps are automatic valves that allow condensate to pass while preventing the passage of steam. There are three basic types of steam traps: thermostatic traps which use temperature sensitivity, thermodynamic traps which use thermodynamic principles, and mechanical traps which use floats or other mechanisms. Thermostatic traps include bimetallic and bellows traps. Thermodynamic traps include disc and piston traps. Mechanical traps include float traps. Proper steam trap selection and installation is important for drainage of condensate in steam pipe lines and industrial processes. Infrared thermography can be used to monitor steam traps for leakage.
This document discusses the performance calculation and monitoring of feedwater heaters in thermal power plants. There are three key variables used to monitor feedwater heater efficiency: terminal temperature difference (TTD), drain cooler approach (DCA), and feedwater temperature rise (TR). The TTD measures how close the outlet water temperature is to the saturation temperature, and a higher TTD indicates poorer performance. The DCA measures how close the drain outlet temperature is to the inlet water temperature, and a higher DCA can cause damage. These variables are calculated and trended monthly to monitor heater performance and identify any issues.
The document describes a computerized maintenance management system (CMMS) and its functions. A CMMS maintains a database of information about an organization's maintenance operations to help workers perform their jobs more effectively. It enables management to schedule preventive maintenance, project costs and downtime, and analyze failures and resource usage. The CMMS has several key functional requirements including asset management, inventory management, work orders, job planning, resource planning, and reporting. It helps organizations achieve greater efficiency, minimize costs and downtime, and maximize asset usage.
Control valves are used to control conditions like flow, pressure, temperature, and liquid level by opening or closing in response to signals from controllers. The document discusses sizing, construction, and types of control valves. It covers topics like globe body design, ANSI standards for sizing and construction, end preparations, and tests conducted on control valves like hydrostatic shell tests and functional tests. Actuator types and positioners are also mentioned. Standards for sizing, testing, cavitation, and noise are listed.
Valves serve various functions in industrial plants including isolation, control, pressure relief, and preventing backflow. There are several types of valves that can be categorized based on their function, including isolation valves like gate valves, globe valves, and butterfly valves used for on/off service. Control valves like top-guided and cage-guided valves are used for modulating or throttling flow in response to process parameters. Pressure relief valves open automatically to protect against overpressure, while check valves allow flow in one direction and prevent reverse flow using swing check, tilt disc, and lift check designs.
Infrared thermography uses infrared sensors to detect abnormal temperatures that can indicate developing equipment problems. It allows for non-contact temperature measurement of moving, electrically hot, fragile, small, or remote targets. Infrared thermography creates images from the infrared light emitted by objects and converts it to a surface temperature map. It is useful for predictive maintenance across various applications including electrical equipment, mechanical systems, commercial buildings, and more.
The Mars Orbiter Mission (MOM), also called Mangalyaan, is an Indian Space Research Organisation (ISRO) Mars orbiter launched in 2013. It successfully entered Martian orbit in 2014. MOM's objectives are to demonstrate India's deep space capabilities and explore the Martian surface, atmosphere, and exosphere. It carries five scientific payloads including cameras and spectrometers weighing 15 kg total. MOM will search for methane on Mars, which could indicate signs of life. ISRO successfully launched MOM using its PSLV rocket and provides ground support from its control centers.
This document discusses lubricant oil analysis and wear debris analysis. It describes how analyzing machine lubricant oils and wear debris particles can help monitor equipment condition, identify abnormal wear or contamination issues, and provide early warnings of potential maintenance needs. Key information extracted from lubricant oil and wear debris analysis includes particle concentrations, types, shapes, sizes, and compositions which can indicate the wear mechanism and likely source of failure occurring within the machine. Together this information helps optimize machine performance, reduce downtime, and increase reliability.
This document discusses various types of wear mechanisms that can occur in machines. It defines 11 main types of wear: adhesive, abrasive, erosion, polishing, contact fatigue, corrosive, electro-corrosive, fretting, electrical discharge, cavitation, and false brinelling wear. For each type of wear, it describes the wear process and provides recommendations for both mechanical and lubricant-based prevention methods. Microscopic analysis of wear debris is also discussed as a way to determine the specific type of wear that occurred.
The document discusses different types of traditional silk sarees from various regions across India. It provides details on iconic silk sarees such as Banarasi, Kanjeevaram, Paithani, Mysore, Pochampalli and more. The document highlights the unique characteristics of each silk saree variety including the materials used, patterns, weaving styles and regions of origin.
This document discusses lubricating oil additives. It begins by introducing lubrication theory and the importance of selecting appropriate lubricants. It then discusses the basic purposes of lubricants to reduce friction and wear. The document focuses on the types and purposes of various lubricating oil additives, including: surface protective additives like antiwear and extreme pressure additives; performance enhancing additives like viscosity index improvers and pour point depressants; and lubricant protective additives like oxidation inhibitors and foam inhibitors. It concludes by discussing common elements in lubricating oil additives and their major end uses.
This document discusses lubricants used in thermal power plants. It begins by introducing the importance of selecting the proper lubricant and understanding lubrication theory. It then discusses the fundamentals of lubrication in reducing friction and wear. Different types of lubricating oils and their characteristics like viscosity and additives are explained. Common additives are outlined that improve performance by interacting with machine metals. Grease composition and characteristics are also covered. The document concludes by examining lubricant specifications for steam turbines and other thermal power plant equipment.
The Agni missile family consists of 5 missiles with ranges from 700-10,000 km that were developed by India. The Agni-I has a range of 700-1200 km and is in service with the Indian Army. The Agni-II has a range of 2000-2500 km. The Agni-III has been successfully tested multiple times and has a range of 3000-5500 km, covering most major Chinese cities. The Agni-IV and Agni-V are newer missiles still under development with extended ranges up to 5000+ km, giving India intercontinental reach.
Pressure relieving valves like safety valves and safety relief valves are used in thermal power plants to prevent overpressure in pressurized systems. There are different types including safety valves, safety relief valves, and power operated relief valves. Safety valves open fully at a set pressure while safety relief valves can open proportionally. Standards like ASME Section I provide requirements for safety valve installation, capacity, materials, and settings to ensure systems are properly protected from overpressure. Safety valves are part of defense-in-depth protection schemes used in power plants to prevent accidents.
This document discusses lubricant testing at thermal power plants. It describes the primary functions of lubricants as reducing friction, heat, and wear while protecting surfaces and removing contaminants. Regular lubricant testing is recommended to monitor equipment condition, ensure specifications are met, and reduce failure rates. Key tests described include particle counting, viscosity testing, acid number measurement, and analysis of additives, water content, and oxidation stability. Specific lubricant testing procedures and frequencies are outlined for steam turbines, mills, fans, pumps and other equipment. Factors that deteriorate lubricant quality like oxidation, thermal degradation, water accumulation and contaminants are also discussed.
Dissolved gas analysis (DGA) of transformer oil detects gases generated within oil-filled transformers that can indicate internal faults. Key gases include hydrogen, methane, ethylene and acetylene, which can identify thermal or electrical issues. DGA interpretation methods like the key gas method or IEC gas ratio method analyze individual and total dissolved combustible gas concentrations to evaluate transformer condition and risk of failure. Regular oil sampling per ASTM standards from the drain point helps assess the internal condition of transformers to support effective maintenance.
This document discusses fans used in thermal power plants. It describes the main types of fans used - forced draft fans, induced draft fans, primary air fans, and gas recirculation fans. It explains their purposes and characteristics. The key points are: forced draft fans supply air for combustion, induced draft fans exhaust flue gas, primary air fans supply air to coal pulverizers, and gas recirculation fans control steam temperature. Common damage mechanisms for power plant fans are erosion, corrosion, and vibration. Condition monitoring is important to predict failures.
TrustArc Webinar - 2024 Data Privacy Trends: A Mid-Year Check-InTrustArc
Six months into 2024, and it is clear the privacy ecosystem takes no days off!! Regulators continue to implement and enforce new regulations, businesses strive to meet requirements, and technology advances like AI have privacy professionals scratching their heads about managing risk.
What can we learn about the first six months of data privacy trends and events in 2024? How should this inform your privacy program management for the rest of the year?
Join TrustArc, Goodwin, and Snyk privacy experts as they discuss the changes we’ve seen in the first half of 2024 and gain insight into the concrete, actionable steps you can take to up-level your privacy program in the second half of the year.
This webinar will review:
- Key changes to privacy regulations in 2024
- Key themes in privacy and data governance in 2024
- How to maximize your privacy program in the second half of 2024
Paradigm Shifts in User Modeling: A Journey from Historical Foundations to Em...Erasmo Purificato
Slide of the tutorial entitled "Paradigm Shifts in User Modeling: A Journey from Historical Foundations to Emerging Trends" held at UMAP'24: 32nd ACM Conference on User Modeling, Adaptation and Personalization (July 1, 2024 | Cagliari, Italy)
Advanced Techniques for Cyber Security Analysis and Anomaly DetectionBert Blevins
Cybersecurity is a major concern in today's connected digital world. Threats to organizations are constantly evolving and have the potential to compromise sensitive information, disrupt operations, and lead to significant financial losses. Traditional cybersecurity techniques often fall short against modern attackers. Therefore, advanced techniques for cyber security analysis and anomaly detection are essential for protecting digital assets. This blog explores these cutting-edge methods, providing a comprehensive overview of their application and importance.
How RPA Help in the Transportation and Logistics Industry.pptxSynapseIndia
Revolutionize your transportation processes with our cutting-edge RPA software. Automate repetitive tasks, reduce costs, and enhance efficiency in the logistics sector with our advanced solutions.
Mitigating the Impact of State Management in Cloud Stream Processing SystemsScyllaDB
Stream processing is a crucial component of modern data infrastructure, but constructing an efficient and scalable stream processing system can be challenging. Decoupling compute and storage architecture has emerged as an effective solution to these challenges, but it can introduce high latency issues, especially when dealing with complex continuous queries that necessitate managing extra-large internal states.
In this talk, we focus on addressing the high latency issues associated with S3 storage in stream processing systems that employ a decoupled compute and storage architecture. We delve into the root causes of latency in this context and explore various techniques to minimize the impact of S3 latency on stream processing performance. Our proposed approach is to implement a tiered storage mechanism that leverages a blend of high-performance and low-cost storage tiers to reduce data movement between the compute and storage layers while maintaining efficient processing.
Throughout the talk, we will present experimental results that demonstrate the effectiveness of our approach in mitigating the impact of S3 latency on stream processing. By the end of the talk, attendees will have gained insights into how to optimize their stream processing systems for reduced latency and improved cost-efficiency.
INDIAN AIR FORCE FIGHTER PLANES LIST.pdfjackson110191
These fighter aircraft have uses outside of traditional combat situations. They are essential in defending India's territorial integrity, averting dangers, and delivering aid to those in need during natural calamities. Additionally, the IAF improves its interoperability and fortifies international military alliances by working together and conducting joint exercises with other air forces.
Support en anglais diffusé lors de l'événement 100% IA organisé dans les locaux parisiens d'Iguane Solutions, le mardi 2 juillet 2024 :
- Présentation de notre plateforme IA plug and play : ses fonctionnalités avancées, telles que son interface utilisateur intuitive, son copilot puissant et des outils de monitoring performants.
- REX client : Cyril Janssens, CTO d’ easybourse, partage son exp��rience d’utilisation de notre plateforme IA plug & play.
Measuring the Impact of Network Latency at TwitterScyllaDB
Widya Salim and Victor Ma will outline the causal impact analysis, framework, and key learnings used to quantify the impact of reducing Twitter's network latency.
Are you interested in dipping your toes in the cloud native observability waters, but as an engineer you are not sure where to get started with tracing problems through your microservices and application landscapes on Kubernetes? Then this is the session for you, where we take you on your first steps in an active open-source project that offers a buffet of languages, challenges, and opportunities for getting started with telemetry data.
The project is called openTelemetry, but before diving into the specifics, we’ll start with de-mystifying key concepts and terms such as observability, telemetry, instrumentation, cardinality, percentile to lay a foundation. After understanding the nuts and bolts of observability and distributed traces, we’ll explore the openTelemetry community; its Special Interest Groups (SIGs), repositories, and how to become not only an end-user, but possibly a contributor.We will wrap up with an overview of the components in this project, such as the Collector, the OpenTelemetry protocol (OTLP), its APIs, and its SDKs.
Attendees will leave with an understanding of key observability concepts, become grounded in distributed tracing terminology, be aware of the components of openTelemetry, and know how to take their first steps to an open-source contribution!
Key Takeaways: Open source, vendor neutral instrumentation is an exciting new reality as the industry standardizes on openTelemetry for observability. OpenTelemetry is on a mission to enable effective observability by making high-quality, portable telemetry ubiquitous. The world of observability and monitoring today has a steep learning curve and in order to achieve ubiquity, the project would benefit from growing our contributor community.
Fluttercon 2024: Showing that you care about security - OpenSSF Scorecards fo...Chris Swan
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2. 1.Introduction
Coal continues to play a predominant role in the
production of electricity in the world, A very large
percentage of the total coal is burned in pulverized
form.
Pulverized coal achieved its first commercial success
in the cement industry. At Wisconsin Electric Power
Company, the use of pulverized coal was also shown
to be a viable fuel for electrical power production after
World War I
Pulverized coal burns like gas, can be easily lighted
and controlled.
3. 2.Coal pulverizer/mill system
One of the critical power
plant components that is
relied upon to convert
the energy stored in coal
into electricity is the coal
pulverizer or mill.
The coal flow is
controlled by the feeder,
allowing coal to flow into
the pulverizer mill.
The pulverized coal and
air mixture is then
transport to the boiler
burner panels.
4. 3.Boiler
Boiler drum
Reheater
Final Super
Platen Super heater
heater LTSH
Economizer
Coal bunker
Wind Box
Secondary
PA duct
air duct
Furnace
Flue gas
APH duct Coal feeder
F D Fan P A Fan
Coal
Pulverizer
5. 4.Pulverizer
The pulverizer receives the raw coal and
reduces it to a very fine, specified size
consist, similar to face powder.
There are four primary principals involved
in pulverization:
• Drying
• Grinding
• Circulation
• Classification
6. 4.1.Drying
The coal that is passing through a
pulverizer is entrained by the use of hot air
usually from the air heater.
During the pulverization process the
surface area of the coal particles increases
dramatically exposing fresh coal to the
entrainment air.
The inherent and surface moisture of the
coal is reduced by the exposure to hot air.
7. 4.2.Grinding
There are three basic
types of grinding:
1. Impaction – where the
material to be ground is hit
or impacted by an outside
force
2. Crushing – where
material is forced between
two fixed objects
3. Attrition – where material
is ground by rubbing or
friction
8. 4.3.Circulation
The primary air, is the method of
circulating the coal through the pulverizer.
Circulating air is also important in allowing
for the removal of heavy material such as
pyrites, extraneous metal, etc. by
centripetal force that otherwise might
damage the grinding mechanisms.
9. 4.4.Classification
The circulating air is also
used to classify the
pulverized coal product
prior to carrying it to the
burners.
The classifier, located on
the top of a mill returns the
over-size material back to
the pulverizer but allows
the proper-sized material to
pass out of the mill to the
burners. classifiers are
critical in providing the
desired quality of pulverized
coal with the desired
fineness
10. 5.Types of Pulverizers
Speed Low Medium High
10 to 20 40 to 70 900 to
rpm rpm 1000 rpm
Type Ball tube Bowl Hammer
mill Ball & race mill
mill
Dominating Attrition Crushing Impact
principle
15. 10.Bowl Mill
Bowl mills are employed to pulverize the pre-crushed
raw coal to the required fineness before it is admitted
into the boiler furnace for combustion.
The mill output can be easily varied, as per the
turndown ratio from its minimum to maximum load.
Crushed raw coal at a controlled rate is fed into the
revolving bowl of the Bowl Mill.
Centrifugal force feeds the coal uniformly over the
replaceable grinding ring where independently spun
rolls exert the required grinding pressure. The rolls do
not touch the grinding ring even when the mill is
empty.
20. 13.1.Fineness
Fineness is an indicator of the quality of the pulverizer
action. Specifically, fineness is a measurement of the
percentage of a coal sample that passes through a set of
test sieves usually designated at 50, 100, and 200 mesh
A 70% coal sample passing through a 200 mesh screen
indicates optimum mill performance.
The mill wear and the power consumption are increased if
the 70% value is exceeded.
Values lower than 70% mean higher carbon loss and
increased fuel consumption.
In addition, coal retained on the 50 mesh screen should be
in the 1–2% range. Higher values indicate worn internals or
improper settings. Also, the higher percentages can cause
boiler slagging and high unburned carbon.
21. 13.2.Sieve distribution chart & Fineness testing
screen
- Plot of coal fineness on Fineness testing screen
Rosin and Rammler
22. 13.3.Mill capacity vs Grindability
Figure shows the
effect of coal
grindability (HGI)
and desired
fineness (percent
passing a 200
mesh screen) on
the mill capacity.
23. 13.4.Moisture and grindability
effects on mill capacity
Figure demonstrates how
moisture and grindability
affect pulverizer capacity.
The dashed line estimates
the increase in mill capacity
in going from a high-volatile
B bituminous coal with a 55
HGI, 12% moisture and a
desired mill output of 70%
through a 200 mesh screen
to a highvolatile B bituminous
coal with an HGI value of 60,
a moisture content of 14%
and the same fineness.
24. 13.5.Mill Rejects
The amount of pulverizer
rejects is one indication
of mill performance.
Pyrites are the common
mineral iron disulfide
(FeS2) that has a pale
brass-yellow color and
metallic luster.
However, it is not
economical to attempt to
grind and burn pyrites & Pyrite Scraper and Guard Assembly
rock.
26. 13.7.Logic tree – Mill Fineness
Decrease
in mill
fineness
SIEVE TEST RESULTS
70% THRU 200 MESH
99.2% THRU 50 MESH
Classifier Loss of Ring or Classifier Exceeding
Vane Roller Roller Vane Mill
position tension wear wear capacity
27. 14.Abrasion in pulverizer
In coal pulverization,
5–20% of the material
being crushed is abrasive
mineral. Coal is not
abrasive by itself. The
minerals in coal that are the
most abrasive are quartz
and pyrite, which cause a
abrasion or severe wear.
carbides in the metal part,
High chromium cast iron
materials are used for
improved abrasion
resistance.
Worn Journal Roll
28. 14.1.CHEMICAL COMPOSITION OF THE
INSERTS GRINDING ROLLS
This specification of high chrome white cast iron
inserts for making Insert Grinding Rolls.
CHEMICAL COMPOSITION OF THE INSERTS:
C = 2.6 – 3.0 %
Cr = 15.0 – 22.0 %
Mo = 1.0 – 2.0 %
W = 1.0 – 2.0%
Mn = 1.0 – 2.0 %
Si = 0.5 – 1.0 %
S = 0.1 % max
P = 0.1 % max
29. 15.Erosion in Pulverizer
Erosion by mineral
particles picked up in the
air stream carrying
pulverized coal through
the mill, classifier,
exhauster, and transport
pipe is a recognized
problem.
Erosion can produce
holes in steel liners and
deep depressions in large
section cast parts.
There has been success
in the industry using
ceramic materials.
Classifier cone with ceramic
30. 16.Startup Procedures
The startup procedures, in addition
to the controls and interlocks,
should follow the requirements of
NFPA 85.
31. 17.Condition Monitoring
The main technologies used in
condition monitoring are:
Vibration analysis ,
Lubricant Oil analysis
Particle count
Viscosity
Total acid measure
Condition of oil additives
Sediment in Lubricating Oils
Any other test recommended by OEM.
32. 18.Inspection
Following inspection parameters are critical for bowl
mill performance:
• Classifier internal condition
• Deflector ring length
• Inverted cone clearance
• Journal assembly condition
• Grinding roll-to-bowl clearance
• Spring pressure for rolls
• Pyrite scraper clearance
• Pyrite rejects chute and/or damper condition
• Feeder settings
• Air in-leakage sources
33. 19.Test code of Pulverizer:
:ASME PTC 4.2
The purpose of this code is to establish
procedures for conducting performance
tests to determine:
Capacity, Fineness of product, Raw coal feed,
Grindability, Moisture, Sizing, Power consumption and
Effect of changes in raw coal Characteristics on
product fineness, pulverizer capacity, and power
consumption.
Effect of changes in pulverizer component settings on
product fineness, pulverizer capacity, and power
consumption.
35. Logic tree – Mill Fineness
Decrease
in mill
fineness
SIEVE TEST RESULTS
Classifier Loss of Ring or Classifier Exceeding
Vane Roller Roller Vane Mill
position tension wear wear capacity