Esp fly ash handling system for the fly ash handling for power plants, pneumatic conveyor system have worldwidely been appliedesp, bag filter, etc. Fly ash handling systems affect power plant availability through their. Characteristics of fly ash from thermal power plants and. Fly ash is captured and removed from the flue gases by economiser, airpreheater and electrostatic precipitator esp. Requirement of ash handling system in thermal power plants coal is.
Introduction in thermal power plants the ash handling practicescoal based solid waste are collected as i. Ash handling options for coalfired power plants power. Sankaran page 3 of 24 the main objectives of primary preparation are. There exists a direct correlation between ec and total salt concentration in fly ash. Operation and maintenance of coal handling system in thermal power plant j. Complete system can be distributed in four sub system. 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. Sep 26, 2017 dry bottom ash handling in pcf power plants. 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. Plant client ash handling system each unit capacity year of initial operati on brief description of system 6. Therefore, the ash can be conveyed by means of a pneumatic conveying system to the final silo figure 7.
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. Wet ash system is can be utilized for bottom ash handling with water impounded hopper and jet pumps for intermittent removal. Maintenance of ash handling plants and pneumatic conveying. 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. This system is suitable, where coal is to be transferred over shorter distance and space limitations exist.
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. Macawber beekays product profile includes jet pumping system for intermittent removal of bottom ash collected at furnace bottom of pf type boilers. 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. Physicochemical characteristics of fly ash samples from. Dry bottom ash handling techniques offer increased thermal. 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. 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.
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. Coal fly ash is an industrial byproduct produced from the burning of pulverized coal, during electricity generation in the thermal power plants. Storage capacity of bottom ash hopper permits sufficient maintenance time for sscc as well as reduces the extraction load on sscc. Complete systems or specific equipment andritz has the solution. Ash handling system in thermal power plant ash handling. Power plants are increasingly adopting dry fly ash disposal systems since the. Fly ash concrete is basically the same as regular concrete except some of the cement has been replaced with a material called fly ash. A coal based thermal power plant consists of large number of integrated. System comprises of water impounded refractory lined bottom ash hopper bah of adequate capacity with water seal trough and dip plates. Bottom ash conversion options and economics 6 conventional dewatering 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. 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. Pneumatic conveying systems are used to handle dry fly ash.
An overview of ash handling plant in energy technology. 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. Handling system for upcoming coal based thermal power. Thermal power plant pressure dense phase pneumatic ash plc. The operation of this system is very simple indeed. Fly ash, coalbased thermal power plants, disposal of fly ash, utilization of fly ash, waste material, resource material, environment i. Such ash can be a considerable environmental nuisance as well as being awkward to handle due to its abrasiveness and hydroscopic characteristics. 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. When the ash storage pond at tennessee valley authoritys tvas kingston fossil plant in harriman, tenn. Mechanical ash handling system bevcon wayors bulk made simple. Ash handling systems may employ different forms of pneumatic ash conveying or mechanical ash conveyors. Ash handling system are generally divided into three types fly ash handling system, bottom ash handling system and ash slurry disposal system.
Power plant engineering unit 02, coal, ash and dust. 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. However, reliable design of such system is not a trivial task and requires considerable amount of knowledge on product. Ash conveying systems densephase pneumatic conveying. The furnace bottom ash and economizer ash is conveyed to dewatering whereas the flyash is conveyed to storage soils. Dry ash collection at coal fired power plants and potential for wte. 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. 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. How works fly ash handling system in thermal power plant. 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. There are basically 2 types of ash handling processes undertaken by ahp. 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. Mac magaldi ash cooler fullydry bottom ash removal system. Watercooled screws or chain conveyors can be adapted easily for different furnace configurations and for any type of solid fuel being combusted.
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. A mechanical ash handling system is often the best choice for fluidized bed ash where headroom is restricted under. A simplified schematic of a hydraulic system is shown in fig. Plant ash extraction, conveyance and storage system this system consists of a bottom ash handling process and a flyash handling process. Coal and ash handling in thermal power plant mcqs with. Since low ash, high grade coal is reserved for metallurgical industries. 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. Pressurized pneumatic ash conveying may also be employed. Consequently, it is used widely as a thermal energy source and also as fuel for thermal power plants producing electricity 1. 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.
Ntpc is the largest thermal power generating company in the country and. Mallick principal coordinator assistant professor incharge of laboratory for bulk solids handling. Explaining ash handling systems for biomass to energy boilers. Working of ash handling system in thermal power plant. 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. Within sscc, a temperature of less than 60degc is always maintained by continuous water makeup and overflow system.
Coal handling plant coal unloading system conveyor system crushing system feeding system. Find details of companies offering ash handling systems at best price. Bop system include coal handling plant, ash handling plant, fuel oil handling. Power plant fly ash material handling system upgrade. Analysis of fly ash heavy metal content and disposal in three.
Swapan basu, ajay kumar debnath, in power plant instrumentation and control handbook, 2015. 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. The environmental aspects are to be considered during planning and design stage of ash dyke it self. Ash handling system of a thermal power plant slideshare. This coal powder is blown into the power plants boiler, the carbon is consumed leaving molten particles rich in silica, alumina. Coal, fly ash, thermal power plant, electro static precipitator, combustion. 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. 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. The ash content of the coal used at the thermal power plants ranges from 3040%, with the average ash content around 38%. 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.
Since inception this division, executed many ash handling plants of different types in major thermal power station in hungary, germany, austria. Pdf the current scenario of thermal power plants and fly ash. 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. Once the ash mound has reached the prescribed height, it is sprayed with polymer layer and vegetation is grown on top of it. 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. Introduction coal is the only natural resource and fossil fuel available in abundance in india. Depending on the end use of coal, the chp facility processes coal to the correct size, making it suitable for boiler. Challenges of ash handling indian coal presents high ash content generally which tends to be inconsistent. Unless a substantial portion of this fly ash fmds some use.
Very finely sized fly ash often accounts for the major portion of the material conveyed in an ash handling system. Ppt on ash handling system click here to download ppt on ash handling system. 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. Stock of each type of ash available at ntpc stations as on 30. 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. On may 25, 2018, the new general data protection regulation gdpr enters into effect in all eu member states. Fly ash dry pneumatic transportation fly ash handling system. It suffers from the drawbacks that the power consumption is high and there is considerablewearofscrew. Almost all chp these days implies reactive maintenance with support of preventive maintenance. The total power consumption for the complete ash handling plant of two 2 units shall be worked out by using the following formula. A simple cycle gas turbine achieves energy conversion efficiencies from 20 to 35%. These benefits are why newer plants are considering adopting dry bottom ash handling.
Generally indian coal contains about 30 to 45% ash. 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. 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. 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. The hot ash from the furnace gets quenched as it enters into the water minimizing the clinker.
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. Bottom ash handling system macawber beekay, ash handling. Bottom ash is extracted from the trough continuously using high quality chains, sprockets and bars. A power point presentation on ash handling system made by me and my friends. Jun 25, 2011 fly ash from thermal power plants waste management and overview article pdf available in current science 10025.
Dry ash handling system in biomass plants magaldi group. Lay out of coal handling plant btps wt 1 wt 2 wt 3 b br house b b con. Please check how we have adjusted our privacy policy in accordance with the european legislation. Pdf fly ash from thermal power plants waste management.
In a coal based thermal power plant, huge amount of ash is generated which has to be disposed off continuously. 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 plant an overview sciencedirect topics. Dry bottom ash handling in pcf power plants youtube. In the thermal plants huge amount of the ash is produced,for coal combustion fly ash is the continuous by product. Combusting biomass in a boiler generates ash with high temperatures. Power plant engineering unit 02, coal, ash and dust handling system faculty. Before coal is consumed in a power plant, it is first ground into a fine powder. One important, but often overlooked factor of an efficient ash handling system, is its compatibility with your facility. Andritz ash handling systems include conveyors and other equipment necessary for removal of bottom ash and fly ash from the power boiler.
Ash handling division of eroterv started working in around year 1955. 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 what are the types of ash in thermal power plant. In thermal power plants coal is generally used as fuel and hence the ash is produced as the byproduct of combustion. Andritz offers complete solutions for biomass boiler ash handling. Development of condition based maintenance for coal handling. Operation and maintenance of coal handling system in thermal. Coal and ash handling systems in thermal power projects. Bottom ash the ash which is directly collected from bottom of boiler. Ash storage silos can be constructed for both fly ash and bottom ash applications. 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.
Coal handling plant of thermal power station seminar report. Fly ash from thermal power plants waste management and overview article pdf available in current science 10025. 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. Coarse ash material such as bottom ash is most often crushed in clinker grinders crushers prior to being transported in the ash conveyor system. The thermal power plants have to use high ash, low grade coal. Ntpc plants it is found that about 20% of the total ash is bottom ash and the balance 80% is fly ash. Coal handling plant can handle coal from its receipt to storage, reclamation, preparation until the final point of use in thermal power plant. V targets for fly ash utilization for thermal power station in operation as on 03. The thermal power plants ash generation has increased from about 40 million tonnes during. Environmental impact of thermal power plant in india and its. 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 a coal based thermal power plant, huge amount of ash is generated which has to be disposed off. Management of ash disposal guru nanak dev engineering. Differentiating between coal and impurities like hard lumps, stones etc. The final component of a highquality ash handling system is the ash storage silo. 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. 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. 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.
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