B - Operations – Transporting – 01 – D
Patent
B - Operations, Transporting
01
D
23/341
B01D 53/34 (2006.01)
Patent
CA 1089193
Abstract of the Invention A catalyst chamber capable of converting the oxides of sulfur to hydrogen sulfide and the oxides of nitrogen to inert nitrogen and ammonia in the presence of a reducing atmosphere is inserted downstream of the boiler section of a fossil fuel burning power generator and there is added a system for extracting formed hydrogen sulfide from the fuel gas stream. After combustion of the primary fuel, typically sulfur bearing coal in excess air, a gaseous hydrocarbon such as methane, is combined with the products of combustion to at least scavenge the oxygen present to form a boiler effluent which ranges from slightly oxidizing to reducing in nature. Where the boiler effluent is reducing in nature, partial conversion of the oxides of sulfur and the oxides of nitrogen occur in the boiler, the balance occurring in the catalyst chamber. Where the gas is slightly oxidizing or only slightly reducing, make up reducing gas is added to the flue gas, either from an external reducing gas generator, or by removing a portion of the flue gas from the boiler section for combination with a vaporized hydrocarbon and air in a secondary boiler to generate the reducing gas for the reactions to take place in the catalyst chamber. The catalyst chamber is typically operated at a temperature from about 300 to about 830°F. In addition to eliminating air pollutants, boiler efficiency is increased.
268295
Hirons & Rogers
Ralph M. Parsons Company (the)
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