How works fly ash handling system in thermal power plant. 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. 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. Ash handling options for coalfired power plants power. Wet ash loading systems fly ash handling for coalfired power plants the fly ash is separated from the flue gas by esps or fabric filters. Ash handling system are generally divided into three types fly ash handling system, bottom ash handling system and ash slurry disposal system. Estimate operating conditions for a given conveying system and type of fly ash. Coal and ash handling systems in thermal power projects.
When it comes to ash handling, that means replacing water with another common medium. 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. The function of coal handling plant in thermal power read more. Bottom ash handling system macawber beekay, ash handling. Ash handling systems ducon supplies both wet and dry type ash systems for power plants.
In thermal power plants coal is generally used as fuel and hence the ash is produced as the byproduct of combustion. Bottom ash is removed from beneath the boiler using a mac magaldi ash cooler system. A complete details about coal handling plant equipments. 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. Fly ash dry pneumatic transportation fly ash handling system. Here is a breakdown of the key components to a suitable ash handling system for a biomass to energy generating plant. Find details of companies offering ash handling systems at best price. Ash handling plant an overview sciencedirect topics. The design of the ash handling plant is dependent upon the method of ash disposal. Ash conveying systems densephase pneumatic conveying. Complete system can be distributed in four sub system. Maintenance of ash handling plants and pneumatic conveying. Complete system can be distributed in four subsystem.
Swapan basu, ajay kumar debnath, in power plant instrumentation and control handbook, 2015. The system for a large modern power station is illustrated in fig 10. Therefore, the ash can be conveyed by means of a pneumatic conveying system to the final silo figure 7. 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. These benefits are why newer plants are considering adopting dry bottom ash handling. 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. Ntpc plants it is found that about 20% of the total ash is bottom ash and the balance 80% is fly ash. 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. Pdf troubleshooting in dry fly ash conveying systems. Fly ash from thermal power plants waste management and overview article pdf available in current science 10025.
Ash that falls to the bottom of the boilers combustion chamber commonly called a firebox is called bottom ash. Fly ash is a byproduct material being generated by thermal power plants from combustion of pulverised coal. Explaining ash handling systems for biomass to energy boilers. 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. 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. Proper utilization, or safe disposal, of such enormous amounts of fly ash is a challenge to engineers associated with power generation. Generally indian coal contains about 30 to 45% ash. 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. Fly ash handling systems affect power plant availability through their. Fly ash is considered a major global pollutant due. Transforming bottom ash into fly ash in coal fired power. Power plant fly ash material handling system upgrade.
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. Combusting biomass in a boiler generates ash with high temperatures. In a coal based thermal power plant, huge amount of ash is generated which has to be disposed off continuously. It is nowadays used in cement, concrete and other cement based applications in india. Fly ash handling in thermal power plants short intensive training course 1011th april, 2015. Dry ash collection at coal fired power plants and potential for wte. Technical knowledge the individual on the job should know and have.
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. When the ash storage pond at tennessee valley authoritys tvas kingston fossil plant in harriman, tenn. 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 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 simple cycle gas turbine achieves energy conversion efficiencies from 20 to 35%. Aug 12, 2015 contents ash disposal ash handling equipment ash handling systems ash discharge equipments site selection 3. 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. Coarse ash material such as bottom ash is most often crushed in clinker grinders crushers prior to being transported in the ash conveyor system. Disposal and utilization of fly ash to protect the environment. 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. 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.
The ash handling capacity of bottom ash handling system, economizer ash handling system, air preheater ash handling system and esp fly ash handling system should be adequately designed keeping in view the likely maximum ash content of the coal qualified boiler operation engineer boe should be engaged in boiler operation to ensure. 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. Ash handling system in thermal power plant ash handling. The initial process in coal based thermal power plant is coal handling. It suffers from the drawbacks that the power consumption is high and there is considerablewearofscrew. Depending on the end use of coal, the chp facility processes coal to the correct size, making it suitable for boiler. Our mission is to create energyefficient solutions and offer the best engineering service and products to our customer. Very finely sized fly ash often accounts for the major portion of the material conveyed in an ash handling system. Aug 05, 2018 what is the processor of ash handling system in thermal power plant boiler. 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. 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.
Ash produced in about 10 to 20% of the total coal burnt in the furnace. 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. High ash content is found to be in range of 30% to 50% in. 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. The material handling systems include coal handling system and ash handling system for thermal power plants and raw material handling.
Working of ash handling system in thermal power plant. Coal and ash handling in thermal power plant mcqs with answers. 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. 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.
System comprises of water impounded refractory lined bottom ash hopper bah of adequate capacity with water seal trough and dip plates. Pssn1001 perform operations of ash handling plant b. Complete systems or specific equipment andritz has the solution andritz offers complete solutions for biomass boiler ash handling. The system was in stalled at a 2x320 mw pc fired power plant in fiume santo e. 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. 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. Fly ash is captured and removed from the flue gases by economiser, airpreheater and electrostatic precipitator esp. 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. A simplified schematic of a hydraulic system is shown in fig. Management of ash disposal guru nanak dev engineering. Expression of interest for technology tieup for ash handling system.
In the thermal plants huge amount of the ash is produced,for coal. 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. Jun 25, 2011 fly ash from thermal power plants waste management and overview article pdf available in current science 10025. Within sscc, a temperature of less than 60degc is always maintained by continuous water makeup and overflow system. Coal and ash handling in thermal power plant mcqs with answers ch ramakrishna 062216. Coal fly ash is an industrial byproduct produced from the burning of pulverized coal, during electricity generation in the thermal power plants.
Pneumatic conveying systems are used to handle dry fly ash. Mechanical ash handling system bevcon wayors bulk made. 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. 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. Sep 30, 2018 working of ash handling system in thermal power plant. The total power consumption for the complete ash handling plant of two 2 units shall be worked out by using the following formula. Andritz offers complete solutions for biomass boiler ash handling. This ash either bottom or fly ash needs to be cooled andor processed to a form that can be transported from the power plant. The dense phase pneumatic pressure conveying systems uses low volume, medium pressure air stream and relies on a continuously expanding volume of air pushing cohesive slugs of material along the pipe.
Pdf fly ash from thermal power plants waste management. Bottom ash is extracted from the trough continuously using high quality chains, sprockets and bars. Pressurized pneumatic ash conveying may also be employed. Wet ash system is can be utilized for bottom ash handling with water impounded hopper and jet pumps for intermittent removal. It is, therefore, inevitable that power plant requires an efficient and reliable ash handling system. Coal handling plants a complete details about chp equipments. Ash handling system of coalfired power plant is a advanced, economic, environmental science and technology. How works fly ash handling system in thermal power plant in. What is the processor of ash handling system in thermal power plant boiler. Ash collected in economiser, primary air heater and secondary air heater hoppers drops continuously through suitable vertical pipe.
Storage capacity of bottom ash hopper permits sufficient maintenance time for sscc as well as reduces the extraction load on sscc. Fly ash or flue ash, also known as pulverised fuel ash in the united kingdom, is a coal combustion product that is composed of the particulates fine particles of burned fuel that are driven out of coalfired boilers together with the flue gases. Coal and ash handling in thermal power plant mcqs with. In the thermal plants huge amount of the ash is produced,for coal combustion fly ash is the continuous by product. During dry fly ash handling they were troubleshoots in conveying systems. Complete systems or specific equipment andritz has the solution. Coal handling plant consists of track hopper,feeders, conveyor system, roller screen, crusher, stacker reclaimer, compressor,dfds system,ttr,pumps etc. A mechanical ash handling system is often the best choice for fluidized bed ash where.
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