Exhaust gas scrubbing process

Details Exhaust gas scrubbing process Exhaust gas scrubbing process

1996-02-15

1997-08-26

Chiesa, Richard L.

Gas separation: processes

Liquid contacting

And recycle or reuse of contact liquid for further contact

55223, 55228, 55229, 55233, 95199, 95202, 95211, 95216, 95224, 95229, B01D 4706

Patent

active

056606150

ABSTRACT:
Exhaust gas is brought into contact with a washing liquid chiefly consisting of water in at least two washing stages. In the last washing stage, fresh water and/or a washing liquid containing fresh water is sprayed into the exhaust gas. In the penultimate washing stage, the exhaust gas is brought in contact with a circulating aqueous salt solution, which contains substances supplied by the exhaust gas. In the penultimate washing stage, the exhaust gas is passed through a washing zone at temperatures in the range from 30.degree. to 150.degree. C., where the quantity of aqueous salt solution passed into the washing zone per Nm.sup.3 exhaust gas flowing through the washing zone is 0.1 to 10 liters. The exhaust gas coming from the penultimate washing zone has a temperature in the range from 30.degree. to 80.degree. C., is saturated with steam for 90 to 100%, and does not contain more than 50% by weight of the dust content of the exhaust gas before the same enters the penultimate washing stage. In the last washing stage, the exhaust gas is passed through a gas-permeable, turbulence producing layer. In the last washing stage, preferably 0.05 to 2 liters washing liquid per Nm.sup.3 exhaust gas are sprayed into the exhaust gas.

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