Watercooled screws or chain conveyors can be adapted easily for different furnace configurations and for any type of solid fuel being combusted. Ash from the furnace grate, falls into a system of water possessing high velocity and is carried to the sumps. All collected ash crushed on the way by crushers, if clinkers are present drops into air stream. This arrangement ensures highest availabilities and a maintenancefree operation, reduces the wear to an absolute minimum and guarantees lowest energy consumptions. Fly ash is captured and removed from the flue gases by economiser, airpreheater and electrostatic precipitator esp. Manufacturer of valves for ash handling system or pneumatic convey dome valve offered by hindustan rubber industries, gurgaon, gurgaon, haryana.
The target conveying rate is 34 tons of fly ash per hour. Pneumatic ash handling system bevcon wayors bulk made simple. Working of ash handling system in thermal power plant. The design of the ash handling plant is dependent upon the method of ash disposal. Airdusco has many years of experience in the design and application of pressure and vacuum dilute phase conveying systems as.
The equipment should be corrosion and wear resistant. Magnum systems dense phase pneumatic conveying system is such a system. Ash conveying systems densephase pneumatic conveying. Ash handling pneumatic conveying handling system from. A pneumatic conveying system is a process by which bulk materials of almost any type. Maintenance of ash handling plants and pneumatic conveying. Thermal power plant pressure dense phase pneumatic ash plc. The ashveyor is an ash conveying system for your esp and baghouse ash handling needs. Pulverized fuel ash power gen plc pdf power gen plc of retford, england rely on macawber engineering at their cottam power station 4. It may be pumped into a disused quarry or transported from the power station for processing into building materials. Concepts pneumatic conveying dynamic air pneumatic. Ash handling pumps dense phase pneumatic conveying. Allenshermanhoff advances its technology development in dilutephase transport systems, pressure densephase transport systems and mechanical drag conveyors. The claudius peters fluidcon system combines the advantages of a pneumatic airslide a low energy requirement with the advantages of conventional pneumatic conveying with standard pipes, the flexible design of the.
Ash collected in economiser, primary air heater and secondary air heater hoppers drops continuously through suitable vertical pipe. Combination vacuumpressure pneumatic ash conveying systems can be beneficially applied to take advantage of the simplicity of a vacuum system for the collection and delivery of ash to a transfer hopper from which it is reclaimed through an air lock feeding device for. The fly ash gets collected at various points, with most of it in esp hoppers. On long distance, highrate applications, a highpressure, lowvelocity system can offer energy savings. For the fly ash collection and transportation we can design and supply different pneumatic transportation system such as. Short machine size is ideal for lowheadroom applications and retrofit. 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. Ash handling plants and pneumatic conveying systems for bulk materials by k. Increasing system throughput quite commonly, the capacity of a dilute phase conveying system needs to be increased. The alphanumeric codification system as per this specification is shown below. Cement, fly ash, food items, resins and dry chemicals are examples of. Jun 02, 2018 ash handling high pressure system hydraulic learn and grow.
One of the methods for handling fly ash is wet system in which the ash is mixed with water to form slurry which is. High velocity air steam is directed to collect ash and dust from all discharge points. Ash handling systems hydraulic system pneumatic system mechanical system 7. Ash bulkhandling system coal handling system speciality conveying system environmentalsystem automation system smart epc solutions designed around your requirements. Jul 12, 2012 the schenck process method of fly ash handling is clean, efficient and fully enclosed, with exceptional reliability and requiring minimum maintenance. Bottom ash handling system macawber beekay, ash handling. A pneumatic system can convey a product at any place a pipe line can run.
Inventory is maintained for a wide range of critical parts, which means fast delivery of the parts you need most. System comprises of water impounded refractory lined bottom ash hopper bah of adequate capacity with water seal trough and dip plates. 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. Plus our conveying capacities range from just a few hundred pounds 100 kg of material per hour up to 400 tons per hour and conveying distances exceeding 5000 feet 1500 m in length. Pneumatic handling can be employed for variety of bulk material including fly ash.
Whether you need to transfer material, bag it, unload it, or convey it over long distances, we have the exact process equipment to meet your specific needs. Pneumatic aeroslides feed the fly ash to the airlifts which then transport the ash into the ash bin. Ash hoppers ejector ejector pyrites holding bin optional basin system clear water return pulverizers mill rejects pipe to holding bin bottom ash optional closed loop recirculating system water clarifying and storage high pressure recirculating pump bottom ash sluice valve fabri valve om150 fabrivalve xs150 fabri valve cf37 bottom ash sluice. Wet ash system is can be utilized for bottom ash handling with water impounded hopper and jet pumps for intermittent removal. Combination vacuumpressure pneumatic ash conveying systems can be beneficially applied to take advantage of the simplicity of a vacuum system for the collection and delivery of ash to a transfer hopper from which it is reclaimed through an air lock feeding device for pressurized. Figure 1 shows the plan view of the equi pment locations and pipe routing. Mecgale was founded in 1994 as an engineering concern. Bottom ash handling system, dome valve for pneumatic. Sep 30, 2018 working of ash handling system in thermal power plant. The final component of a highquality ash handling system is the ash storage silo. With the appropriate choice of system, material can be transported with minimal degradation little or no exposure of the product to the environment can transport relatively long distances several thousand feet excellent for multiple sources and multiple destinations ability to transport material which might be air, moisture, etc.
Fly ash is the major constituent of the ash generated from pulverized and fluidized bed coalfired boilers. Vacuum pressure pneumatic ash conveying systems national. Quality valve products designed specifically for ash handling in the power industry. Ash was also awarded the two largest ash handling system contracts ever tendered at that time, both for taiwan power companys taichung station. 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. Third, they are flexible in terms of rerouting and expansion. Ash handling high pressure system hydraulic learn and grow. Highly abrasive products and those subject to degradation move best through a highpressure, lowvelocity conveying system. Pressurized pneumatic ash conveying may also be employed. Ash storage silos can be constructed for both fly ash and bottom ash applications. Wet ash handling systems project engineering division.
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. During the last more than two decades, we have progressed manifold and have become a technically competent epc. Aug 12, 2015 ash handling systems hydraulic system pneumatic system mechanical system 7. It is important, therefore, that any system built to convey this ash should be. These systems can handle temperatures up to 650f 1800f with assembly and can be arranged in a single line of 1 to 10 units. A typical pneumatic ash handling system will employ vacuum pneumatic ash collection and ash conveying from several ash pick up stationswith delivery to an ash storage silo for interim holding prior to load out and transport. 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. Ash handling system in thermal power plant ash handling plant. Ash is collected in hoppers for further handling for disposal by trucks. To provide the most effective pneumatic conveying system for ash handling requires a range of pumps and pressure vessels for the power and heavy industries the range of pumps available from schenck process are as follows.
Ash handling system of coalfired power plant is a advanced, economic, environmental science and technology. Rendition of a ucc nuveyor system for a utility boiler, including gravity discharge ash pit hopper. Ash handling systems ducon supplies both wet and dry type ash systems for power plants. Pneumatic conveying can be defined as the transport of dry material through pipelines using gas air as a motive force. The system selection is based upon the application and material properties. Our pneumatic conveying systems handle a multitude of dry bulk materials for countless industriesfrom manufacturing to transportation, energy to utilities, and much more in between. The fly ash discharge points are connected to a common fluidcon conveying pipe and the ash is continuously removed and can be conveyed long distances. The system proposed is a combination va cuum and pressure conveying system. The schenck process method of fly ash handling is clean, efficient and fully enclosed, with exceptional reliability and requiring minimum maintenance. 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. Being enclosed these are relatively clean, more environmentally acceptable and simple to maintain 3.
Pneumatic conveying can be used for particles ranging from fine powders to pellets and bulk densities of 16 to 3200 kgm3 1 to 200 lbft3. Ash handling system are generally divided into three types fly ash handling system, bottom ash handling system and ash slurry disposal system. 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 systems hydraulic system pneumatic system mechanical system. Pneumatic conveying systems offer an ideal choice for the handling of fly ash.
When the ash storage pond at tennessee valley authoritys tvas kingston fossil plant in harriman, tenn. Take, for example, a system operating at 12 psig, near the relief of the positive displacement blower. Quality valve products designed specifically for ash handling. Bevcon dense phase pneumatic conveying system technology is suitable for transporting fine, difficult and abrasive materials along a pipe line as a coherent slug plug at a very low velocity 26. 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.
Second, pneumatic systems are totally enclosed and if required can operate entirely without moving parts coming into contact with the conveyed material. Macawber beekays product profile includes jet pumping system for intermittent removal of bottom ash collected at furnace bottom of pf type boilers. A typical system, outlined below, includes both facilities. One important, but often overlooked factor of an efficient ash handling system, is its compatibility with your facility. A conveying system for fly ash must also be designed properly. Ash handling systems andritz ash handling systems include conveyors and other equipment necessary for removal of bottom ash and fly ash from the power boiler.
Additionally this type of system can be utilized in ash removal plants where it is particularly suitable for the removal of fly ash from a baghouse or esp. The velocity at the pickup point where the solids are introduced into the system is 5000 fpm. Explaining ash handling systems for biomass to energy boilers. Ash handling pneumatic conveying handling system from schenck. The vacuum conveying system begins at the base of the unit baghouse where the as h air mixture is. Dense phase pneumatic conveying system is generally adopted on account of many of its advantages like positive pressure system, low material conveying velocity, lesser erosion rates, conveying of fine and coarse ash separately as collected thus increasing utility of fly ash, capability to convey longer distances in a single stretch etc. We also delivers aftersales services which include installation, servicing and maintenance of equipments. Ashveyor ash conveying systems for esp and baghouse ash. Dense phase technologypresentation fly ash utilisation 2018. Therefore, the ash can be conveyed by means of a pneumatic conveying system to the final silo figure 7. Introductionin thermal power plants the ash handling practicescoal based solid waste are collected as i.
Swapan basu, ajay kumar debnath, in power plant instrumentation and control handbook, 2015. Ash handling systems may employ pneumatic ash conveying or mechanical ash conveyors. Demech has also supplied system for coke handling with nitrogen as conveying medium instead of air. Such ash can be a considerable environmental nuisance as well as being awkward to handle due to its abrasiveness and hydroscopic. With options varying from fly ash to bottom ash conveyors, and pneumatic versus mechanical ash handling systems, our experts are ready to. Often times, pneumatic conveying systems are used to transfer fly ash from the collection hoppers to the storage silos. Fly ash is captured and removed from the flue gases by economiser, air preheater and electrostatic precipitator esp. Ash collecting aeroslide system beneath the esp ash transport. Ash conveyor systems designed specifically for conveying hot, abrasive ash such as bottom ash or fly ash from boiler beds, bag houses, or electrostatic precipitators. Bevcon offering pneumatic conveying system is the most efficient and effective method of transporting granular and bulk solid materials to storage or to process unit within a production environment. Designed to operate as a multiplevessel system on one conveying line.
Such ash can be a considerable environmental nuisance as well as being awkward to handle due to its abrasiveness and hydroscopic characteristics. Bottom ash handling 2 valves for ash furnace bottom ash hoppers ejector ejector pyrites holding bin optional basin system clear water return pulverizers mill rejects pipe to holding bin bottom ash optional closed loop. Airdusco has many years of experience in the design and application of pressure and vacuum dilute phase conveying systems as well as pressure and vacuum dense phase. Vacuum pressure pneumatic ash conveying systems combination vacuumpressure ash handling conveying systems. This is unique to industry and has proved incredibly effective even with ash at high temperatures. Valves for ash handling system or pneumatic convey dome. Ash handling plant an overview sciencedirect topics.
1302 1117 1272 1440 1112 1342 1645 209 908 605 1155 762 520 1457 35 660 655 1175 612 1030 807 276 506 1203 186 1216 1011 1645 662 1538 1620 745 255 1097 1182 821 1420 984 1423 770 1481 20 1026