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. Ash handling system in thermal power plant ash handling. Such ash can be a considerable environmental nuisance as well as being awkward to handle due to its abrasiveness and hydroscopic characteristics. Pneumatic ash handling system bevcon wayors bulk made simple. Ash handling pumps dense phase pneumatic conveying. Wet ash system is can be utilized for bottom ash handling with water impounded hopper and jet pumps for intermittent removal. Ash is collected in hoppers for further handling for disposal by trucks. Such ash can be a considerable environmental nuisance as well as being awkward to handle due to its abrasiveness and hydroscopic. System comprises of water impounded refractory lined bottom ash hopper bah of adequate capacity with water seal trough and dip plates. This is unique to industry and has proved incredibly effective even with ash at high temperatures. The alphanumeric codification system as per this specification is shown below. Vacuum pressure pneumatic ash conveying systems national. 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.
Fly ash is the major constituent of the ash generated from pulverized and fluidized bed coalfired boilers. 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. A pneumatic system can convey a product at any place a pipe line can run. Quality valve products designed specifically for ash handling. Macawber beekays product profile includes jet pumping system for intermittent removal of bottom ash collected at furnace bottom of pf type boilers. 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. Pulverized fuel ash power gen plc pdf power gen plc of retford, england rely on macawber engineering at their cottam power station 4. Ash handling systems may employ pneumatic ash conveying or mechanical ash conveyors.
The final component of a highquality ash handling system is the ash storage silo. One important, but often overlooked factor of an efficient ash handling system, is its compatibility with your facility. 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. Quality valve products designed specifically for ash handling in the power industry. Valves for ash handling system or pneumatic convey dome.
It may be pumped into a disused quarry or transported from the power station for processing into building materials. Ash handling pneumatic conveying handling system from schenck. The velocity at the pickup point where the solids are introduced into the system is 5000 fpm. 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. Rendition of a ucc nuveyor system for a utility boiler, including gravity discharge ash pit hopper.
Ash storage silos can be constructed for both fly ash and bottom ash applications. 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. Thermal power plant pressure dense phase pneumatic ash plc. The fly ash gets collected at various points, with most of it in esp hoppers. Explaining ash handling systems for biomass to energy boilers. Ash bulkhandling system coal handling system speciality conveying system environmentalsystem automation system smart epc solutions designed around your requirements. Increasing system throughput quite commonly, the capacity of a dilute phase conveying system needs to be increased. Ashveyor ash conveying systems for esp and baghouse ash. 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. The design of the ash handling plant is dependent upon the method of ash disposal. 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.
When the ash storage pond at tennessee valley authoritys tvas kingston fossil plant in harriman, tenn. Ash handling systems hydraulic system pneumatic system mechanical system. Take, for example, a system operating at 12 psig, near the relief of the positive displacement blower. 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. 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. With options varying from fly ash to bottom ash conveyors, and pneumatic versus mechanical ash handling systems, our experts are ready to. Fly ash is captured and removed from the flue gases by economiser, air preheater and electrostatic precipitator esp.
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. Pneumatic conveying can be defined as the transport of dry material through pipelines using gas air as a motive force. During the last more than two decades, we have progressed manifold and have become a technically competent epc. 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. Magnum systems dense phase pneumatic conveying system is such a system. This arrangement ensures highest availabilities and a maintenancefree operation, reduces the wear to an absolute minimum and guarantees lowest energy consumptions.
Inventory is maintained for a wide range of critical parts, which means fast delivery of the parts you need most. Demech has also supplied system for coke handling with nitrogen as conveying medium instead of air. Pneumatic aeroslides feed the fly ash to the airlifts which then transport the ash into the ash bin. 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. Ash from the furnace grate, falls into a system of water possessing high velocity and is carried to the sumps. 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. Sep 30, 2018 working of ash handling system in thermal power plant. Vacuum pressure pneumatic ash conveying systems combination vacuumpressure ash handling conveying systems. 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. Mecgale was founded in 1994 as an engineering concern. One of the methods for handling fly ash is wet system in which the ash is mixed with water to form slurry which is.
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. It is important, therefore, that any system built to convey this ash should be. 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. Maintenance of ash handling plants and pneumatic conveying. Ash handling systems hydraulic system pneumatic system mechanical system 7. 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. Pressurized pneumatic ash conveying may also be employed. Introductionin thermal power plants the ash handling practicescoal based solid waste are collected as i. Short machine size is ideal for lowheadroom applications and retrofit. Swapan basu, ajay kumar debnath, in power plant instrumentation and control handbook, 2015. Ash collected in economiser, primary air heater and secondary air heater hoppers drops continuously through suitable vertical pipe. Third, they are flexible in terms of rerouting and expansion. Second, pneumatic systems are totally enclosed and if required can operate entirely without moving parts coming into contact with the conveyed material.
The equipment should be corrosion and wear resistant. Ash was also awarded the two largest ash handling system contracts ever tendered at that time, both for taiwan power companys taichung station. Ash handling systems ducon supplies both wet and dry type ash systems for power plants. A conveying system for fly ash must also be designed properly. Working of ash handling system in thermal power plant. Ash handling high pressure system hydraulic learn and grow. Ash handling plant an overview sciencedirect topics. The vacuum conveying system begins at the base of the unit baghouse where the as h air mixture is. Figure 1 shows the plan view of the equi pment locations and pipe routing. A typical system, outlined below, includes both facilities. 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 target conveying rate is 34 tons of fly ash per hour. We also delivers aftersales services which include installation, servicing and maintenance of equipments. All collected ash crushed on the way by crushers, if clinkers are present drops into air stream. 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. 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.
Quality valve products designed specifically for ash. On long distance, highrate applications, a highpressure, lowvelocity system can offer energy savings. Ash conveying systems densephase pneumatic conveying. A pneumatic conveying system is a process by which bulk materials of almost any type. Manufacturer of valves for ash handling system or pneumatic convey dome valve offered by hindustan rubber industries, gurgaon, gurgaon, haryana. Ash handling system are generally divided into three types fly ash handling system, bottom ash handling system and ash slurry disposal system. The schenck process method of fly ash handling is clean, efficient and fully enclosed, with exceptional reliability and requiring minimum maintenance. Wet ash handling systems project engineering division. Airdusco has many years of experience in the design and application of pressure and vacuum dilute phase conveying systems as. 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. Watercooled screws or chain conveyors can be adapted easily for different furnace configurations and for any type of solid fuel being combusted.
Therefore, the ash can be conveyed by means of a pneumatic conveying system to the final silo figure 7. Ash handling pneumatic conveying handling system from. Allenshermanhoff advances its technology development in dilutephase transport systems, pressure densephase transport systems and mechanical drag conveyors. Pneumatic handling can be employed for variety of bulk material including fly ash. These systems can handle temperatures up to 650f 1800f with assembly and can be arranged in a single line of 1 to 10 units.
Ash handling system of coalfired power plant is a advanced, economic, environmental science and technology. Jun 02, 2018 ash handling high pressure system hydraulic learn and grow. Pneumatic conveying systems offer an ideal choice for the handling of fly ash. The system selection is based upon the application and material properties. Fly ash is captured and removed from the flue gases by economiser, airpreheater and electrostatic precipitator esp. Aug 12, 2015 ash handling systems hydraulic system pneumatic system mechanical system 7. Dense phase technologypresentation fly ash utilisation 2018. 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. The ashveyor is an ash conveying system for your esp and baghouse ash handling needs. Bottom ash handling system macawber beekay, ash handling. Designed to operate as a multiplevessel system on one conveying line.
Being enclosed these are relatively clean, more environmentally acceptable and simple to maintain 3. High velocity air steam is directed to collect ash and dust from all discharge points. Jul 12, 2012 the schenck process method of fly ash handling is clean, efficient and fully enclosed, with exceptional reliability and requiring minimum maintenance. 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. 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. Often times, pneumatic conveying systems are used to transfer fly ash from the collection hoppers to the storage silos. 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. The system proposed is a combination va cuum and pressure conveying system. Bottom ash handling system, dome valve for pneumatic.
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. For the fly ash collection and transportation we can design and supply different pneumatic transportation system such as. Ash collecting aeroslide system beneath the esp ash transport. Highly abrasive products and those subject to degradation move best through a highpressure, lowvelocity conveying system. Concepts pneumatic conveying dynamic air pneumatic.
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