Ash Removal

Ash Removal

 

removal from the boiler area of ash and slag accumulated in ash and slag bunkers of steam boilers when solid fuel (coal, peat, shales) is burned. At electric power stations, removal of ash with water is most often used; less frequent is pneumatic removal. Mechanical ash removal using scraper equipment, skip hoists, and scraper and apron conveyors is employed extensively in industrial boilers burning fuel in grate-fired furnaces. These devices carry ash and slag away from the boiler room to a collecting bunker, from which they are removed by railroad cars or dump trucks. With small boilers giving under 200 kg per hr of ash and slag, use is made of small narrow-gauge cars with dumping bodies, monorail suspension transport, and gravity-discharge containers. To avoid dust, the slag and ash are wetted with water before removal from the bunkers. Up to 80 tons per hour of ash and slag are removed from modern boiler plants.

References in periodicals archive ?
After extensive testing, John Deere's DPF can go up to 15,000 hours before ash removal. Like its counterparts, the 210G LC features excellent total fluid economy (diesel fuel and DEF).
The DPF can go up to 15,000 hours before ash removal. The new models feature a larger hood for improved engine access, a nine-pin diagnostic connector moved into the cab to reduce diagnostic testing time, and a single side ground level fluid filter service, which moves the engine oil, fuel, and hydraulic pilot oil filters to ground level on the right side of the machine and adds a service door for easy access to change filters, www.JohnDeere.com.
Duke has already placed four of the sites on a priority list for likely excavation and closure, with ash removal to dry, lined landfills or for reuse as construction fill.
Results to date show the combination of insecticide injections, selective ash removal and trap trees is slowing the growth of the EAB population in the two areas.
Large, reusable ceramic boats make the sample handling process easy to manage, and allow for ash removal after every analysis.
Ash pans are a common optional feature, but many stove shoppers demand an ash pan on the assumption that it will make ash removal easier and neater.
The managers of a coal-fired power plant believed that the ash removal system was not operating as efficiently as it should.
Ash removal technique with small amount of water has recently been tested at the Balti Power Plant (Arro et al., 2007).
Environmental Protection Agency (EPA) Region 4 has approved the Tennessee Valley Authority's (TVA) selected cleanup plan for the next phase of coal ash removal at the TVA Kingston site in Roane County, Tenn.
A cordwood-fired furnace, for example, requires manual fuel loading and ash removal. Such furnaces have been commercially available for many years and fuel is readily available.
Fly ash removal from flue gas by using electrostatic precipitators (ESP), cyclones, fabric filters, or wet scrubbers will result in a dry fine solid particulate material, which is commonly called an air-pollution-control (APC) residue [1,2].
EPA is requiring a minimum of 150,000 miles to first ash removal. If the DPF needs replacing, the price tag is reported to be $5000 to $7000.