In thermal power plants, coal is used as a fuel for generating electricity. Ash handling system in thermal power plant ash handling. In thermal power plants coal is generally used as fuel and hence the ash is produced as the byproduct of combustion. More than 100 million tons of fly ash is produced in the united states every year. Ash handling system power plant engineering amit mak youtube. The effect of fly ash on the environment can vary based on the thermal power plant where it is produced, as well as the proportion of fly ash to bottom ash in the waste product. A suitable sized grizzly is provided to separate any lump, which is collected in bypass chute and removed manually. Ash handling pneumatic conveying handling system from. Fly ash is considered a major global pollutant due to the. For years, wet bottom ash handling has been the standard for power plants throughout the world.
Fly ash system esp hopper transmitter vessel fly ash silo spout ash conditioner closeopen truck. It is nowadays used in cement, concrete and other cement based applications in india. A large quantity of ash, is produced in steam power plants using coal. These suppliers do maintain such systems and transport fly ash collected at the end of thermal power units. Selected information on ash handling plants from standard design criteria guidelines for balance of plant of 2 x 500 mw or above thermal power project published by central electricity authority, new delhi, india 110066, in september 2010 is given in this article. Working of ash handling system in thermal power plant. In fly ash handling system, the major objective is to collect and transport the fly ash from the ash hoppers of the esp to the fly ash silo or to the ash slurry making tank.
This is why each facility needs a dedicated ash handling system that can take care of ash generated from plant production in a smooth, efficient, and costeffective manner. Coal handling plants a complete details about chp equipments. The direct cost of electric energy produced by a thermal power station is the result of cost of fuel, capital cost for the plant, operator labour, maintenance, and such factors as ash handling and disposal. Fly ash disposal and management of bakreshwar thermal power plant bktpp, the 3rd largest tpp in west bengal has become a major issue of concern. The current paper discusses the problems associated with fly ash and its handling and mitigation measures. Conditions type transfer pressure transfer velocity pros cons dilutelean phase. Fly ash handling systems affect power plant availability through their. Pneumatic conveying systems are used to handle dry fly ash. Carbon in ash gives it a dark color, and as a result the ash becomes unsuitable for certain applications. Andritz offers complete solutions for biomass boiler ash handling. Requirement of ash handling system in thermal power plant s coal is generally used as fuel and hence the ash is produced as the byproduct of combustion. Bottom ash is most often conveyed in a hydraulic system in which the ash is entrained in a highflow, circulating water system and delivered to an ash pond or to dewatering storage bins.
Pdf troubleshooting in dry fly ash conveying systems. The plant was built in 1926 and at the time of its completion was the largest fossil fuel generating station of its kind in the world, capable of producing over 400,000 horsepower and 766 megawatts of electricity. Jun 23, 2015 as a result, power plants have thoroughly analyzed their production processes to find ways to minimize waste, achieve efficiency, promote environmentallyfriend procedures, and cut costs. Coarse ash material such as bottom ash is most often crushed in clinker grinders crushers prior to being transported in the ash conveyor system. Ash handling system free download as powerpoint presentation. Mechanical ash handling system bevcon wayors bulk made simple. Nov 14, 2012 ash handling system in thermal power plant pdf ash handling system in thermal power plant pdf 01 jun 2012 gulin supply mining and construction equipment for mineral handling. When it comes to ash handling, that means replacing water with another common medium. The pneumatic bed ash handling system, in general, consists of collection of bed ash from ba coolers supplied by others in water cooled surge hoppers. Maintenance of ash handling plants and pneumatic conveying. Pdf energy requirements for the developing countries in particular. The large ash particles are collected under the furnace in a waterfilled ash hopper, fly ash is collected in dust collectors with either an electrostatic precipitator or a baghouse. Thermal power plant pressure dense phase pneumatic ash plc control system.
Coal and ash handling in thermal power plant mcqs with. Demech provides variety of systems to handle bottom ash or bed ash generated by the solid fuel fired boilers. Ash handling options for coalfired power plants power. Mar 17, 2015 this is why each facility needs a dedicated ash handling system that can take care of ash generated from plant production in a smooth, efficient, and costeffective manner. The system for a large modern power station is illustrated in fig 10. Vacuum system includes conveying of fly ash from various fly ash hoppers up to the intermediate buffer surge hopper ish located near esp. Water used for bottom ash handling is recirculated from the dewatering bins. In plant handling it is referred to transferring coal from dead or live storage to the boiler. When the ash storage pond at tennessee valley authoritys tvas kingston fossil plant in harriman, tenn. It may be pumped into a disused quarry or transported from the power. In electrical systems and equipment third edition, 1992.
The initial process in coal based thermal power plant is coal handling. Ash handling system in thermal power plant coal handling plants. Our offered range of handling system is widely used in various industries like sugar industry, foundry industry and fertilizer industry. The ash content in superior grades of coal can be as low as 6 to 8 %, but can be as high as 45% in poor grades. Coal and ash handling in thermal power plant mcqs with answers. A university in the northeastern part of north dakota needed to upgrade their central heating system. Swapan basu, ajay kumar debnath, in power plant instrumentation and control handbook, 2015. Fly ash from thermal power plants waste management and overview. Ash handling systems ducon supplies both wet and dry type ash systems for power plants.
In a coal based thermal power plant, huge amount of ash is generated which has to be disposed off continuously. The ash content of the coal used at the thermal power plants ranges from 3040%, with the average ash. As the requirements and limitations of environmental protection, water resources and others, positive pressure pneumatic ash handling is widely used as ash handing method in chinas coalfired power plant. This is due to the different chemical makeup of the coal based on the geology of the area the coal is found and the burning process of the coal in the power plant. A typical ash handling system may employ vacuum pneumatic ash collection with ash conveying from several ash pick up stations and resulting in delivery to an ash storage silo for interim holding prior to load out for disposal or reuse.
Dry ash collection at coal fired power plants and potential for wte. The function of coal handling plant in thermal power read more ash handling system in thermal power plant. Coal handling plant can handle coal from its receipt to storage, reclamation, preparation until the final point of use in thermal power plant. Ash collected in economiser, primary air heater and secondary air heater hoppers drops continuously through suitable vertical pipe. Pneumatic conveying systems to transport fly ash in dry mode are extensively used in coal fired thermal power plants in india in large capacities due to the high. Plant ash extraction, conveyance and storage system this system consists of a bottom ash handling process and a flyash handling process. Thermal power generation, coal consumption and ash generation in india.
Power plant fly ash material handling system upgrade. Ash handling system are generally divided into three types fly ash handling system, bottom ash handling system and ash slurry disposal system. Coal and ash handling a university reduces maintenance and increases efficiency with a complete coal and ash handling system download pdf challenge. Vacuum system is generally adopted when the extraction distance is less, numbers of esp hoppers are more and plant layout demands twostage conveying.
Oct 15, 2017 types of ash handling system in power plant engineering 1. Introduction to thermal power plant general layout of thermal power plant site selection criterion of thermal power plant coal preparation coal storage ash handling. The winters in the region are long and cold requiring a 7 month heating season. Factors like availability of other resources like water, land etc. Ash produced in about 10 to 20% of the total coal burnt in the furnace. Thermal power plant pressure dense phase pneumatic ash plc. Combusting biomass in a boiler generates ash with high temperatures. Coal and ash handling systems in thermal power projects.
In the thermal plants huge amount of the ash is produced,for coal combustion fly ash is the continuous by product. Fly ash generated while burning of coal in thermal power plants can be utilised for. Ash handling system of coalfired power plant is a advanced, economic, environmental. What a plant is generating is the plant utilization factor. Requirement of ash handling system in thermal power plants coal is generally. Burning of pulverized coal in the furnace results in the generation of large quantity of ash.
Ash handling system in thermal power plant pdf 01 jun 2012 gulin supply mining and construction equipment for mineral handling. Fly ash is one of the residues generated in combustion, and comprises the fine particles that rise with the flue gases. Pdf fly ash from thermal power plants waste management and. Complete systems or specific equipment andritz has the solution.
Fly ash dry pneumatic transportation fly ash handling system. Fly ash handling system dilute phase dense phase vacuum hydraulic. Please send us the list of thermal power plants in india updated in pdf or excel format. Fly ash processing equipment feeco international inc. This ash either bottom or fly ash needs to be cooled andor processed to a form that can be transported from the power plant. Ash handling system backed by strong expertise and knowledge, we manufacture and present best quality ash handling systems. Ash handling systems may employ different forms of pneumatic ash conveying or mechanical ash conveyors. Coal and ash handling in thermal power plant mcqs with answers ahsan 071919 good information and some more info like size of coal and equipment descriptions or dictionary of these terms to be included.
Report on minimisation of water requirement in coal based thermal power stations 2 system. Fly ash handling wherever products are burned it is necessary to have an energy efficient ash handling system, especially in a power station environment where large quantities of pulverized fuel ash pfa are created. Dense phase pneumatic pressure conveying system the dense phase pneumatic pressure conveying systems uses low volume, medium pressure air stream and relies. Pdf fly ash from thermal power plants waste management. In 2016 tp automation was contracted to upgrade the fly ash handling system at a local power plant.
The second meeting of the committee was held in cea, new delhi on 25. In a coal based thermal power plant, huge amount of ash is. A power point presentation on ash handling system made by me. A mechanical ash handling system is often the best choice for fluidized bed ash where headroom is restricted under.
The schenck process method of fly ash handling is clean, efficient and fully enclosed, with exceptional reliability and requiring minimum maintenance. At its dadri power station, ntpc has set up a unique. Fly ash generated while burning of coal in thermal power plants. Ash handling system what are the types of ash in thermal power plant. Such ash can be a considerable environmental nuisance as well as being awkward to handle due to its abrasiveness and hydroscopic. Pneumatic conveying system of fly ash in a thermal power plant. It is seen that appellants are installing pdfacs systems in the factories of thermal plants and contract for maintenance providing man power etc. Ash handling system of coalfired power plant is a advanced, economic, environmental science and technology. Ash handling system of a thermal power plant slideshare. The focus in these meetings was on reducing plant consumptive water requirement by use of dry cooling system for condenser cooling in thermal power plants.
Handling of ash is a problem because ash coming out of the furnace is too hot, it is dusty and irritating to handle and is accompanied by some poisonous gases 4. The system has to be selected based on many factors like type of boiler, size of boiler, amount of bottom ash generated, method of final handling etc. During dry fly ash handling they were troubleshoots in conveying systems. The design of the ash handling plant is dependent upon the method of ash disposal. Boilers burning pulverized coal pc have bottom furnaces. Nearly half of this fly ash is reused for purposes such.
After burning of coal, 40 % of total coal consumption is converted into. The entire water requirement of the ashhandling system may be met with circulating water where the plant does not have a cooling tower facilitythat is, for a oncethrough system in coastal stations using lake or river water, or seawater. Ash generated in power plant is about 30 40% of total coal consumption and hence the system is required to handle ash for its proper utilization or disposal. Thermal efficiency of a thermal power plant is the ratio of electrical energy generated to the chemical energy of fuel consumed. Need for mechanized ash handling systems mechanized ash handling systems developed as the size of coal fired boilers increased beyond the sizes permitting manual handling of large quantity of ash. The presented system included a tapered section in order to achieve. Ash handling plant an overview sciencedirect topics. It may be pumped into a disused quarry or transported from the power station for processing into building materials. Depending on the end use of coal, the chp facility processes coal to the correct size, making it suitable for boiler. May 07, 2014 requirement of ash handling system in thermal power plants coal is generally used as fuel and hence the ash is produced as the byproduct of combustion.
Systems that use impounded hoppers or submerged scrapper conveyors have traditionally handled ash using water as a primary medium. Electronic information systems of the open access for effective solution of both environmental and coal ash utilization issues v. Explaining ash handling systems for biomass to energy boilers. In addition to rotary dryers for drying fly ash, we can provide custom rotary kilns to accomplish the induration of fly ash for use in concrete products. Itc eligible on maintaining systems to collect fly ash. For a subcritical plant it is below 42% for a new plant. Very finely sized fly ash often accounts for the major portion of the material conveyed in an ash handling system. In fly ash handling system, the major objective is to collect and transport the fly ash from the ash hoppers of the esp to the fly ash silo or to the ash. Plant client ash handling system each unit capacity year of initial operati on brief description of system 6. Layout of ash handling plant or ash handling system in thermal power plant. It suffers from the drawbacks that the power consumption is high and there is considerablewearofscrew. Pneumatic conveying systems to transport fly ash in dry mode are extensively used in coal fired thermal power plants in india in large capacities due to the high ash content of indian coal and the increasing requirements of conveying fly ash in dry form.
Malikova national research university moscow power engineering institute, information and analytical centre ecology in power. Material handling we offer a complete line of material handling equipment both as standalone systems, as well as a complement to our processing equipment. This ash constitutes of 80% fly ash and 20% bottom ash. Pressurized pneumatic ash conveying may also be employed. Jun 25, 2011 download fulltext pdf download fulltext pdf.
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