Retrofit of all ash handling and storage systems for 2 x mwatt boilers including bottom ash, fly ash, pyrites, back pass and air heater ash positions. Complete system can be distributed in four sub system. This coal powder is blown into the power plants boiler, the carbon is consumed leaving molten particles rich in silica, alumina. Ash handling systems ducon supplies both wet and dry type ash systems for power plants. Water used for bottom ash handling is recirculated from the dewatering bins. It is nowadays used in cement, concrete and other cement based applications in india. Since inception this division, executed many ash handling plants of different types in major thermal power station in hungary, germany, austria. 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. A simplified schematic of a hydraulic system is shown in fig. Power plants are increasingly adopting dry fly ash disposal systems since the. Ash slurry system ash from boiler is transported to ash dump areas by means of sluicing type hydraulic system which consists of two types of systems. Firm has to submit performance certificate or copy of the repeat order from the same power plant as a proof of satisfactory execution of work. Fly ash concrete is basically the same as regular concrete except some of the cement has been replaced with a material called fly ash. Please check how we have adjusted our privacy policy in accordance with the european legislation.
What is the processor of ash handling system in thermal power plant boiler. Ash handling system in thermal power plant ash handling. Analysis of fly ash heavy metal content and disposal in three. V targets for fly ash utilization for thermal power station in operation as on 03. Plant client ash handling system each unit capacity year of initial operati on brief description of system 6. Ntpc is the largest thermal power generating company in the country and. Coal handling plant coal unloading system conveyor system crushing system feeding system. Fly ash handling systems affect power plant availability through their.
The thermal power plants have to use high ash, low grade coal. 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. Watercooled screws or chain conveyors can be adapted easily for different furnace configurations and for any type of solid fuel being combusted. Coal and ash handling systems in thermal power projects. Site 2 power plant has asias first 100% dry ash extraction system with transit ash storage silos and final storage in the form of ash mounds. Swapan basu, ajay kumar debnath, in power plant instrumentation and control handbook, 2015. 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. Wet ash system is can be utilized for bottom ash handling with water impounded hopper and jet pumps for intermittent removal. Coal fly ash is an industrial byproduct produced from the burning of pulverized coal, during electricity generation in the thermal power plants. In a typical fly ash handling system, the material that is generated as a result of combustion is captured by an electrostatic precipitator esp or a baghouse before.
Conveyors leading to crusher house have facility for manual stone picking, at a suitable. Since low ash, high grade coal is reserved for metallurgical industries. The furnace bottom ash and economizer ash is conveyed to dewatering whereas the flyash is conveyed to storage soils. Andritz offers complete solutions for biomass boiler ash handling. The thermal power plants ash generation has increased from about 40 million tonnes during. Very finely sized fly ash often accounts for the major portion of the material conveyed in an ash handling system. Generally indian coal contains about 30 to 45% ash.
The final component of a highquality ash handling system is the ash storage silo. Within sscc, a temperature of less than 60degc is always maintained by continuous water makeup and overflow system. Dry ash handling system in biomass plants magaldi ecobelt bio the magaldi ecobelt bio is a system for dry extraction, cooling and conveying of bottom ash produced by grate boilers burning biomass e. The hot ash from the furnace gets quenched as it enters into the water minimizing the clinker. When the ash storage pond at tennessee valley authoritys tvas kingston fossil plant in harriman, tenn. In a coal based thermal power plant, huge amount of ash is generated which has to be disposed off continuously. Power plant engineering unit 02, coal, ash and dust. There are basically 2 types of ash handling processes undertaken by ahp. Maintenance of ash handling plants and pneumatic conveying. Ntpc plants it is found that about 20% of the total ash is bottom ash and the balance 80% is fly ash. Almost all chp these days implies reactive maintenance with support of preventive maintenance. Fly ash from thermal power plants waste management and overview article pdf available in current science 10025. These benefits are why newer plants are considering adopting dry bottom ash handling.
Before coal is consumed in a power plant, it is first ground into a fine powder. Coal, fly ash, thermal power plant, electro static precipitator, combustion. Pressurized pneumatic ash conveying may also be employed. Jun 25, 2011 fly ash from thermal power plants waste management and overview article pdf available in current science 10025. Pulverized fuel ash commonly known as fly ash is a useful byproduct from thermal power stations using pulverized coal as fuel and has considerable pozzolonic activity. In a coal based thermal power plant, huge amount of ash is generated which has to be disposed off. An overview of ash handling plant in energy technology. A mechanical ash handling system is often the best choice for fluidized bed ash where headroom is restricted under. Therefore, the ash can be conveyed by means of a pneumatic conveying system to the final silo figure 7. Pneumatic conveying systems are used to handle dry fly ash.
Coarse ash material such as bottom ash is most often crushed in clinker grinders crushers prior to being transported in the ash conveyor system. Dry ash collection at coal fired power plants and potential for wte. 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. It suffers from the drawbacks that the power consumption is high and there is considerablewearofscrew. How works fly ash handling system in thermal power plant. Environmental impact of thermal power plant in india and its. Introduction coalbased thermal power plants have been a major source of power ge neration in india where about 57% of the total power obtained is from coalbased thermal power plants 1. Find details of companies offering ash handling systems at best price. Bottom ash conversion options and economics 6 conventional dewatering systems. Plc based hydro pneumatic ash handling system of any thermal plant of 110 mw or above capacity for a period of minimum 2 years during last 5 years ending 31. Consequently, it is used widely as a thermal energy source and also as fuel for thermal power plants producing electricity 1. Ash collected in economiser, primary air heater and secondary air heater hoppers drops continuously through suitable vertical pipe.
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. Such ash can be a considerable environmental nuisance as well as being awkward to handle due to its abrasiveness and hydroscopic characteristics. Complete systems or specific equipment andritz has the solution. In the thermal plants huge amount of the ash is produced,for coal combustion fly ash is the continuous by product. The ash content of the coal used at the thermal power plants ranges from 3040%, with the average ash content around 38%. Ash storage silos can be constructed for both fly ash and bottom ash applications. The energy efficiency of a conventional thermal power station is defined as saleable energy produced as a percent of the heating value of the fuel consumed.
In thermal power plants coal is generally used as fuel and hence the ash is produced as the byproduct of combustion. Introduction to thermal power plant general layout of thermal power plant site selection criterion of thermal power plant coal preparation coal storage ash handling electrostatic precipitator. This system is suitable, where coal is to be transferred over shorter distance and space limitations exist. 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. One important, but often overlooked factor of an efficient ash handling system, is its compatibility with your facility. The total power consumption for the complete ash handling plant of two 2 units shall be worked out by using the following formula.
Introduction coal is the only natural resource and fossil fuel available in abundance in india. Challenges of ash handling indian coal presents high ash content generally which tends to be inconsistent. Handling system for upcoming coal based thermal power. Combusting biomass in a boiler generates ash with high temperatures. There exists a direct correlation between ec and total salt concentration in fly ash. Stockyard management description in order to achieve a fully automated operation from a central control room the operator must know how much. In the thermal power plants maximum requirements of fuel is a coal. As more and more thermal power plants are being set up in the country to meet the ever increasing demand of power, it is estimated that 115120 million tonnes of fly ash will be genrated annually in the country even before the end of this centuryl. Ash handling systems may employ different forms of pneumatic ash conveying or mechanical ash conveyors. The environmental aspects are to be considered during planning and design stage of ash dyke it self. Fly ash dry pneumatic transportation fly ash handling system. Sankaran page 3 of 24 the main objectives of primary preparation are. Ash handling system what are the types of ash in thermal power plant.
Fly ash, coalbased thermal power plants, disposal of fly ash, utilization of fly ash, waste material, resource material, environment i. Coal and ash handling in thermal power plant mcqs with. Explaining ash handling systems for biomass to energy boilers. Development of condition based maintenance for coal handling. Storage capacity of bottom ash hopper permits sufficient maintenance time for sscc as well as reduces the extraction load on sscc. Introduction in thermal power plants the ash handling practicescoal based solid waste are collected as i. Ash handling options for coalfired power plants power. Lay out of coal handling plant btps wt 1 wt 2 wt 3 b br house b b con. Bop system include coal handling plant, ash handling plant, fuel oil handling. Characteristics of fly ash from thermal power plants and. Depending on the end use of coal, the chp facility processes coal to the correct size, making it suitable for boiler. However, reliable design of such system is not a trivial task and requires considerable amount of knowledge on product.
Ash handling plant an overview sciencedirect topics. Coal and ash handling in thermal power plant mcqs with answers ch ramakrishna 062216. The basic theory of condition based preventive maintenance is to propose routine inspection to identify any degradation in the integrity of the systems during their service life and to provide an early warning in order that remedial action can be taken. Power plant engineering unit 02, coal, ash and dust handling system faculty. Thermal power plant pressure dense phase pneumatic ash plc. Esp fly ash handling system for the fly ash handling for power plants, pneumatic conveyor system have worldwidely been appliedesp, bag filter, etc. This national resource has been gainfully utilized for manufacture of pulverized fuel ash lime bricks as a supplement to common burnt clay buildings bricks leading to. Pdf the current scenario of thermal power plants and fly ash. A simple cycle gas turbine achieves energy conversion efficiencies from 20 to 35%. 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. A trial operation showed that mixed fly and bottom ash from a coal fued power plant can be reused as raw material for cement production 6. Ash handling system are generally divided into three types fly ash handling system, bottom ash handling system and ash slurry disposal system. Dry bottom ash handling techniques offer increased thermal.
Bottom ash is extracted from the trough continuously using high quality chains, sprockets and bars. Stock of each type of ash available at ntpc stations as on 30. Sep 26, 2017 dry bottom ash handling in pcf power plants. Differentiating between coal and impurities like hard lumps, stones etc.
The fly ash handling system transports the ashes pneumatically with the compressed air from blower or air compressor through proper pipeline to the ash silo. Ash handling system of a thermal power plant slideshare. Operation and maintenance of coal handling system in thermal power plant j. Operation and maintenance of coal handling system in thermal.
Wet ash handling system the free falling ash from boiler furnace is collected and stored in a w shaped water impounded bottom ash hopper provided below boiler furnace for its periodic removal twice in a shift of eight 8 hours per unit. Plant ash extraction, conveyance and storage system this system consists of a bottom ash handling process and a flyash handling process. They range in size from 300 cubic feet to 17,500 cubic feet, and are designed to work seamlessly with ash handling systems like the ones we have discussed. In typical thermal project of 2000mw capacity, the daily ash production will be about 2200 tonnes of bottom ash and about 1 tonnes of fly ash. Bottom ash handling system macawber beekay, ash handling. 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.
Aug 09, 2016 introduction to thermal power plant general layout of thermal power plant site selection criterion of thermal power plant coal preparation coal storage ash handling electrostatic precipitator. Mac magaldi ash cooler fullydry bottom ash removal system. The operation of this system is very simple indeed. 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. Mallick principal coordinator assistant professor incharge of laboratory for bulk solids handling. Ash handling division of eroterv started working in around year 1955. Unless a substantial portion of this fly ash fmds some use. Macawber beekays product profile includes jet pumping system for intermittent removal of bottom ash collected at furnace bottom of pf type boilers. With options varying from fly ash to bottom ash conveyors, and pneumatic versus mechanical ash handling systems, our experts are ready to help evaluate which application is best for your plant. Heat power 5th sem of coal fired power plant by repowering through pressurized pulverized coal combustion and waste heated feed water heating, journal of power technologies, in press. Coal handling plant can handle coal from its receipt to storage, reclamation, preparation until the final point of use in thermal power plant. When new power plants were being designed in the 1970s, the state of the art ash handling systems at the time were closed loop water recirculation systems that involved a tank farm thousands of feet away from the boiler. Once the ash mound has reached the prescribed height, it is sprayed with polymer layer and vegetation is grown on top of it. System comprises of water impounded refractory lined bottom ash hopper bah of adequate capacity with water seal trough and dip plates.
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. Fly ash is captured and removed from the flue gases by economiser, airpreheater and electrostatic precipitator esp. Dry bottom ash handling in pcf power plants youtube. In this paper, changchun hightech thermal power plant unit 2 25mw ash delivery system is taken as object describing the configuration and project delivery process of pneumatic ash handling system, according to the control performance requirements of the ash handling system unit designed to using siemens s7200 type plc for the control core of. The entire water requirement of the ash handling 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. Coal handling plant of thermal power station seminar report. A coal based thermal power plant consists of large number of integrated. Dry ash handling system thermal power plant duration. Pdf fly ash from thermal power plants waste management. In a typical fly ash handling system, the material that is generated as a result of combustion is captured by an electrostatic precipitator esp or a baghouse before the flue gases reach the stack. On may 25, 2018, the new general data protection regulation gdpr enters into effect in all eu member states.
Requirement of ash handling system in thermal power plants coal is. Power plant fly ash material handling system upgrade in 2016 tp automation was contracted to upgrade the fly ash handling system at a local power plant. Working of ash handling system in thermal power plant. 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. Disposal and utilization of fly ash to protect the environment. Coal handling plant of thermal power station seminar report pdf ppt download abstract. Andritz ash handling systems include conveyors and other equipment necessary for removal of bottom ash and fly ash from the power boiler. Ppt on ash handling system click here to download ppt on ash handling system. Power plant fly ash material handling system upgrade. A power point presentation on ash handling system made by me and my friends. For example, theres a story about a new 800 mw coalfired plant, located in germany, that is using a dry bottom ash handling technique known as drycon instead of traditional water. Pneumatic conveying systems for fly ash handling in thermal power plants short intensive training course 1011th april, 2015 organized by department of mechanical engineering thapar university, patiala contact dr. Management of ash disposal guru nanak dev engineering.
Physicochemical characteristics of fly ash samples from. Bottom ash the ash which is directly collected from bottom of boiler. Ash conveying systems densephase pneumatic conveying. This ash either bottom or fly ash needs to be cooled andor processed to a form that can be transported from the power plant. Dry ash handling system in biomass plants magaldi group. Mechanical ash handling system bevcon wayors bulk made simple.
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