The major difference between the use of scrubbers and the use of fluidized - bed combustions as pollution control measures in power plants is that fluidized bed combustions usually operate at a lower temperature whereas scrubbers require higher temperatures.
Mixing crushed coal with limestone is a part of fluidized bed combustion.
The limestone neutralizes a large portion of the sulphur dioxide in the coal. Finally, steam is produced by boiling water using the heat produced by combustion.
With the help of gas, water, and air, a scrubber may separate and remove particles that are in liquid or sludge form or that escape as clean gas.
In some circumstances, water droplets scrape sulphur dioxide and particles from exhaust streams, converting them to sludge that can be disposed of later.
The process starts with dirty air entering, combustion exhaust steam moving upward in mist, mist collecting particles and bringing them to the bottom of the unit, dirty water moving sludge to a removal system, sludge is separated from water and disposed of, water moving to the scrubber for reuse, mist collecting on screen, and clear air exiting.
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