The target conveying rate is 34 tons of fly ash per hour. Introductionin thermal power plants the ash handling practicescoal based solid waste are collected as i. 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. Often times, pneumatic conveying systems are used to transfer fly ash from the collection hoppers to the storage silos. 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. Our units are designed to handle bottom ash and fly ash. Pneumatic conveying of pulverized fuel ash fly ash handling. As part of our complete environmental technologies line, we continue to provide a variety of ash and material handling solutions, from completely dry bottom ash handling to fly ash and petroleum coke processing. In 2016 tp automation was contracted to upgrade the flyash handling system at a local power plant. Dry bottom ash decision analysis technology alternativestechnology alternatives 1 worst, 5 best scale 15 recirc system sfc pax vax criteria for determing technology selection wt sc total sc total sc total sc total water usageavailability 0 2 03050 5 0 outage time available 0 5 04020 3 0 total installed costtotal installed cost 0 1 0 5 0 3 0 3 0. Fly ash handling systems affect power plant availability through their interaction with the electrostatic precipitator esp and. Pdf troubleshooting in dry fly ash conveying systems. Ash handling systems may employ different forms of pneumatic ash conveying or mechanical ash conveyors.
Such ash can be a considerable environmental nuisance as well as being awkward to handle due to its abrasiveness and hydroscopic. 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. Fbc ash is extracted from the lower part of the boiler through a certain number of drain pipes. Environmental protection epa to create new regulations for ash handling that will. The fly ash gets collected at various points, with most of it in esp hoppers.
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. 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. 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. With options varying from fly ash to bottom ash conveyors, and pneumatic versus mechanical ash handling systems, our experts are ready to. The design and operation of an ash treatment system at the. Pneumatic conveying systems offer an ideal choice for the handling of fly ash. Fluidized bed ash handling in fbc power plants magaldi group. The vacuum conveying system begins at the base of the unit baghouse where the as h air mixture is. Importance of ash handling system fly ash handling systems affect power plant availability through their interaction with the electrostatic precipitator esp and bag house requirements to meet todays environmental quality standards. The final component of a highquality ash handling system is the ash storage silo. The material for the bahp bottom ash high pressure, balp bottom ash low pressure and fahp fly ash high pressure water pumps shall be as below.
Ash handling screw conveyors precision machine and. The dry fly ash system consists of a two stage esp and duct hopper ash removal conveying system. Explaining ash handling systems for biomass to energy boilers. Dry ash collection at coal fired power plants and potential for wte. 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. A large quantity of ash, is produced in steam power plants using coal. Ash handling pneumatic conveying handling system from schenck. Andritz ash handling systems include conveyors and other equipment necessary for removal of bottom ash and fly ash from the power boiler. Mar 17, 2015 the final component of a highquality ash handling system is the ash storage silo. We have installed complete ash handling systems for power plants, pulp and paper mills, waste to energy facilities, etc.
Jun 26, 2018 air preheater ash handling system ash generated from aph hopper is evacuated once in a shift by vacuum conveying system connected with the esp hopper vacuum conveying system 20. One of the methods for handling fly ash is wet system in which the ash is mixed with water to form slurry which is pumped to slurry pit. Ash storage silos can be constructed for both fly ash and bottom ash applications. Dense phase pneumatic system conveying speed is low. The system proposed is a combination va cuum and pressure conveying system. Ash handling plant an overview sciencedirect topics. Macawber beekays product profile includes vacuum system for extraction of dry fly ash collected at eco air preheater duct electrostatic precipitator hoppers of pf type boilers. Much like with bottom ash, there are both wet and dry handling systems for fly ash. Mechanical ash handling systems mechanical ash handling systems. 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. Vacuum system envisages conveying of dry fly ash from ash hoppers by vacuum pumps and collection in ish. In the second stage, fly ash is conveyed from under these hoppers to the storage. One important, but often overlooked factor of an efficient ash handling system, is its compatibility with your facility.
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 first stage includes extraction of dry fly ash from under the various esp duct hoppers to intermediate hoppers located near the esps. 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 first stage, ash collected and stored in hoppers is extracted in dry form through pneumatic vacuum extraction system using.
Ash handling pneumatic conveying handling system from. Figure 1 shows the plan view of the equi pment locations and pipe routing. Abnormal operation if the differential pressure of one filter fan installed on the top of silo is high, the fly ash handling system on silo defect will be stopped. Fly ash is captured and removed from the flue gases by economiser, airpreheater and electrostatic precipitator esp located at the outlet of the furnace and before the induced. Ash conveying systems densephase pneumatic conveying. It is, therefore, inevitable that power plant requires an efficient. Sep 30, 2018 ash handling system are generally divided into three types fly ash handling system, bottom ash handling system and ash slurry disposal system. Fly ash is the major constituent of the ash generated from pulverized and fluidized bed coalfired boilers. 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. Fly ash silo ab filter fans can be shutdown manually from dcs. 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.
Fly ash booklet for pdf federal highway administration. The airlift has a stable working point and the equipment is selfadjusting. One of the methods for handling fly ash is wet system in which the ash is mixed with water to form slurry which is. Pressurized pneumatic ash conveying may also be employed. Bottom ash conversion options and economics 6 conventional dewatering systems. Fly ash handling system dry mode fly ash carried along with the flue gas from the boiler is collected continuously in esp hoppers extraction, transportation and.
Esp fly ash handling system for the fly ash handling for power plants, pneumatic conveyor system have worldwidely been appliedesp, bag filter, etc. Very finely sized fly ash often accounts for the major portion of the material conveyed in an ash handling system. Vacuum type pneumatic system clear space is available below esp area. Ash handling system in thermal power plant ash handling. Fly ash dry pneumatic transportation fly ash handling system. Wet ash handling systems project engineering division. A conveying system for fly ash must also be designed properly. It is important, therefore, that any system built to convey this ash should be. An experienced product support staff with access to detailed component lists is dedicated to providing the correct oem parts for your specific application, vintage, model and brand of ash handling equipment.
At the time of its completion it was the largest fossil fuel generating station of its kind in the world, capable of producing over 400,000 horsepower. Extremeduty, abrasionresistant screw conveyors for moving fly ash and bottom ash away from boilers. 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. Vacuum system is generally adopted when the extraction distance is less, numbers of esp hoppers are more and plant layout demands two. An additional implementation some producers may want to incorporate to help adjust to upcoming fly ash handling regulations is a liquid ring vacuum pump.
A second stage system positive pressure system is employed to convey fly ash from ish to main fly ash silos. The fly ash unloading system eth consists of the ash storage in two silos and unloads them in the closed tankers and in the open trucks design basis the ash unloading system has to be able to store fly ashes coming from a pneumatic ash handling system and to discharge them in open trucks and in closed tankers. Ash handling systems have experienced gradual changes since the 1970s, but the kingston event triggered the u. If the two silos are full, the fly ash handling system will shut down automatically. Pneumatic conveying of pulverized fuel ash power gen plc of retford, england rely on macawber engineering at their cottam power station 4. Ash handling plant ppt free download as powerpoint presentation. Maintenance of ash handling plants and pneumatic conveying. Dry bottom ash handling options and new technology fly ash. Fly ash handling cdg is well versed in providing feasibility studies, analysis, design and construction support for fly ash handling projects. Therefore, the ash can be conveyed by means of a pneumatic conveying system to the final silo figure 7. It is, therefore, inevitable that power plant requires an efficient and reliable ash handling system. By closing this banner, scrolling this page, clicking a link or continuing to browse otherwise, you agree to the use of cookies.
Wet ash system is can be utilized for bottom ash handling with water impounded hopper and jet pumps for intermittent removal. 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. Pneumatic conveying systems are used to handle dry fly. Generally the power plants prefer dry fly ash disposal instead of making ash slurry from the fly ash and the reason is that the fly ash collected. Bottom ash comprises of waterimpounded hopper, crusher, jet pump and piping upto sump. By mixing the ash its disposal is simplified as the combined ash is sent to the. Pneumatic conveying of pulverized fuel ash fly ash. Our engineered upgrades are evaluated for potential improvements in system performance, ease of maintenance, and reduced operational costs. Ash handling system are generally divided into three types fly ash handling system, bottom ash handling system and ash slurry disposal system. Jul 12, 2012 the schenck process method of fly ash handling is clean, efficient and fully enclosed, with exceptional reliability and requiring minimum maintenance. Fly ash handling system dry mode fly ash carried along with the flue gas from the boiler is collected continuously in esp hoppers extraction, transportation and disposal of fly ash from esp are in two stages 21.
Watercooled screws or chain conveyors can be adapted easily for different furnace configurations and for any type of. Proper utilization, or safe disposal, of such enormous amounts of fly ash is a challenge to engineers associated with power generation. Feeco has been processing fly ash for over 65 years, providing custom, highquality agglomeration and material handling equipment for dedusting fly ash, and turning it into a more marketable product. The schenck process method of fly ash handling is clean, efficient and fully enclosed, with exceptional reliability and requiring minimum maintenance. Watercooled screws or chain conveyors can be adapted easily for different furnace configurations and for any type of solid fuel being combusted. Fugitive emissions from a dry coal fly ash storage pile.
Fly ash thru vacuum system 3 x 45 tph thru water exhauster. Ash handling options for coalfired power plants power. Ash collected in economiser, primary air heater and secondary air heater hoppers drops continuously through suitable vertical pipe connections to the flushing connections provided beneath each of the hoppers. Fly ash can be transferred using air slides, bucket conveyors and screw conveyors, or it can be pneumatically conveyed through pipelines under positive or negative pressure conditions fly ash is transported to markets in bulk tanker trucks, rail cars and bargesships fly ash can be packaged in super sacks or smaller bags for. 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. Fly ash processing equipment feeco international inc. Designs include upgraded ar400 or tribraze flights and upgraded materials of construction in the troughs for longlife in a harsh application. Pdf fly ash is the finely divided mineral residue resulting from the combustion of coal in electric generating plants. Ash conveying systems brochure macawber engineering.
Each vacuum pump, dedicated to a stream, can convey both coarse and fine ash. Such ash can be a considerable environmental nuisance as well as being awkward to handle due to its abrasiveness and hydroscopic characteristics. Bahp, balp and fahp water pumps the pumps shall be of horizontal, centrifugal direct driven type. Appreciate the importance and relevance of fly ash properties and characterization towards designing pneumatic conveying systems evaluate quantitatively the densephase suitability of a given fly ash estimate operating conditions for a given conveying system and type of fly ash.