Process and apparatus for removing a contaminant from a gas

Details Process and apparatus for removing a contaminant from a gas Process and apparatus for removing a contaminant from a gas

B - Operations, Transporting

01

D

B01D 53/78 (2006.01) B01D 53/34 (2006.01)

Patent

CA 2189386

Process and apparatus for removing a contaminant from a gas effluent. The apparatus comprises an absorption tower in which is placed a suitable packing where the gas effluent and contaminant-absorbing liquid contact one another. A recirculation path transfers spent contaminant-absorbing liquid to the top of the tower allowing the liquid to effect a new contaminant- removal cycle. Reagent is introduced in the recirculation path to refresh the contaminant-absorbing liquid. A dual-controller system dynamically varies the amount of reagent introduced in the recirculation path in accordance with the amount of contaminant in the gas effluent. A master controller calculates a reagent concentration set-point. The set-point is communicated to a slave controller that meters reagent in the recirculation path according to the set-point value.

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