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 ?
Total quantity or scope: 1 lot - Implementation of the planned renovation of the ash removal equipment in Zeran Power Plant in Warsaw;
Applicable equipment includes waste hoppers and feeders; combustion gas cooler boilers; slag crane hydraulic buckets and curing conveyor components of the ash removal equipment; and, among electrical instrumentation, flue-gas analyzers.
Common diesel particualte filters are very susceptible to changes in duty cycle and longer idling periods leading to ash removal at periodic intervals sometimes as often as 2-3 times a year to prevent the plugging of the filter.
After extensive testing, John Deere's DPF can go up to 15,000 hours before ash removal.
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.
Also, if the proportions of Ca-silicate phases decrease along the boiler gas pass in PF boilers, then, in contrast, in the CFBC boiler system, the proportions of Ca-silicates are rather uniform in the first part of the ash removal system and increase nearly exponentially in the electrostatic precipitators (Figs.
Ash removal technique with small amount of water has recently been tested at the Balti Power Plant (Arro et al.
A cordwood-fired furnace, for example, requires manual fuel loading and ash removal.
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].
This results in a "small reactor core with relatively easy maintenance and simple ash removal," he said.
Foster Wheeler provided engineering, procurement and delivery of six 350 MW steam generators, coal-handling equipment, and ash removal systems, with these generators using Foster Wheeler's double-arch fired technology.
Ash removal makes the resulting fuel more versatile, so the CENfuel(TM) product can be co-fired in boilers designed for gas or oil, giving a plant fuel-switching ability, depending on the price and availability of competing fuels.