Chemistry of inorganic compounds – Sulfur or compound thereof – Oxygen containing
Patent
1988-12-14
1990-03-20
Heller, Gregory A.
Chemistry of inorganic compounds
Sulfur or compound thereof
Oxygen containing
423239, 423240, 423244, C01B 1798, C01B 700, C01B 1700, B01T 800
Patent
active
049100114
ABSTRACT:
In flue gases or other humid exhaust gases which are relatively cold and contain SO.sub.2, NO.sub.2 and other gaseous pollutants, the SO.sub.2 content is oxidized to SO.sub.3 and the NO content is reduced by a catalytic treatment, the SO.sub.3 content is condensed as sulfuric acid and other gaseous pollutants are removed by being scrubbed with aqueous liquids at low temperatures. In order to heat up the flue gas to the temperature required for the catalysis, the flue gas is heated up in a first heating-up stage by an indirect heat exchange with the catalytically treated gas before the catalytic treatment, the heated-up gas is heated up further in a second heating-up stage to the temperature required for the catalytic treatment, the catalytically treated gas which has been cooled in the first heating-up stage is cooled further in an indirect heat exchanger below the dew point temperature of sulfuric acid and is subsequently fed to an SO.sub.3 condenser. The remaining sulfuric acid vapor is absorbed by sprayed dilute sulfuric acid to form a dilute sulfuric acid having a predetermined concentration, the gas leaving the SO.sub.3 condenser is scrubbed in a scrubber with a sprayed aqueous liquid and is thus cooled to 40.degree. to 60.degree. C. and the purified gas is reheated to the required chimney inlet temperature.
REFERENCES:
patent: 3607034 (1971-09-01), Henry et al.
patent: 3647360 (1972-03-01), Jaeger
patent: 4744967 (1988-05-01), Brand et al.
B.W.K. Brennstoff Warme Kraft, Band 37, No. 9, Sep. 1985, Seiten 77-84, Dusseldorf, DE; B. Scharer et al.: "Zur Wirtschaftlichkeit der NOx-Abgasreinigung bei Grossfeuerungsanlagen", *FIG. 2b; Seiten 79-80*.
Dorr Karl-Heinz
Grimm Hugo
Neumann Heinz
Olhms Norbert
Heller Gregory A.
Metallgesellschaft AG
Stadtwerke Munster GmbH
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