Flue Gas Deacidification

Wet Scrubbing Systems - Spray Dryer Systems - Dry Injection Systems

  
Typical Wet Scrubbing Process
Flue gas enters the absorber and
travels up through the absorption
zone where it contacts the absorbent
slurry or solution that is passing
counter-currently down through
the absorber.  The scrubbed gas continues upward through a mist eliminator that traps entrained absorbent droplets before the flue gas exits the scrubber.  The scrubber solution falls into a recycle tank in the bottom of the absorber and is pumped to a nozzle header above the absorption zone.  A bleed stream is pumped to a disposal or slurry dewatering system.

  Typical Spray Dryer Process

An alkaline slurry or solution is atomized into the flue gas in the spray dryer absorber, using patented two-fluid nozzle technology.  The finely atomized droplets absorb SO2 and acid gases while the heat of the flue gas evaporates the droplets.  The flue gas, along with the dried reaction products and solid particulate, is then collected in a fabric filter or electrostatic precipitator.  If a fabric filter is used, additional SO2 and acid gas removal occurs as the flue gas passes through the built up filter cake on the bag.

Typical Dry Sorbent Reactor Process

A dry absorbent is injected into the flue gas in an up-flow Dry Sorbent Reaction Chamber upstream of a fabric.  Acid gas is absorbed in the Reactor.  The flue gas then passes through a filter cake in the fabric filter bags where additional acid gases are absorbed and solid particulate is collected.  A portion of the collected solids is recycled back into the Dry Sorbent Reactor to increase acid gas removal and lower absorbent consumption.
 

 
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