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US 4,908,195 AGranted
Process of purifying exhaust gas
AssigneeMetallgesellschaft Aktiengesellschaft
InventorsDieter Wanner, Horst Schade
Life of this patent
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Abstract
Disclosed is a process for the purification of an exhaust gas which contains dust and gaseous pollutants, such as SO.sub.2, SO.sub.3, HCl, HF and nitrogen oxides. In the process 70 to 90% of the total amount of sorbent required is introduced as a dry powder into the gas stream and the remaining 10 to 30% of the sorbent is introduced into the gas stream as a solution or suspension after a turbulence has been induced in the gas stream.
Claims14
A process of purifying an exhaust gas comprising:
- (a) providing an exhaust gas stream at a temperature of about 350.degree. to 450.degree. C. containing dust and gaseous pollutants including SO.sub.2, HCl and nitrogen oxides;
- (b) introducing a dry solid absorbent into the gas stream in an amount of 70 to 90% of total required absorbent;
- (c) contacting the gas stream with a fixture to produce a turbulence in the gas stream;
- (d) adding the remainder of the total required absorbent as a solution or suspension to the turbulent gas stream in an amount so that the temperature of the exhaust gas is decreased in an amount of not more than 15.degree. C. to produce a treated gas stream;
- (e) removing dusts and solids from the treated gas stream;
- and
- (f) catalytically treating the treated gas stream to remove nitrogen oxide therefrom.
4 more elements
Dependencies are inferred from the claim text.