Chemistry of inorganic compounds – Modifying or removing component of normally gaseous mixture – Nitrogen or nitrogenous component
Patent
1992-06-22
1993-07-06
Heller, Gregory A.
Chemistry of inorganic compounds
Modifying or removing component of normally gaseous mixture
Nitrogen or nitrogenous component
42324306, 423512A, 423545, C01B 2100, C01B 1700, C01B 1720, C01B 1745
Patent
active
052251756
ABSTRACT:
The invention comprises a method and a system for separating very fine particulates from gaseous effluents resulting from the burning of coal or other fossil fuels, or from other combustion processes, such particulates being too small for typical methods to separate. The method utilizes the SO.sub.2, which normally occurs in such gaseous effluents, as a vehicle to enlarge the particles. The gaseous effluent is mixed with water droplets whereby some of the water evaporates; a gaseous ammonia is then injected into the mixture under conditions such as to cause ammonium sulfite to form and to condense on the particles, thus enlarging the particles, and water to condense on the particles, thus further enlarging them; and the now enlarged particles are separated from the gaseous effluent by known methods. DeNO.sub.x and DeSO.sub.x procedures may also be performed on the gaseous effluent prior to the process noted above. Likewise heat recovery may be effected.
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Chappel, G. A., "Aqueous Scrubbing of Nitrogenous Oxides from Stack Gases" American Chemical Society, Washington, D.C. (1973) pp. 206-217.
Shale, G. C., "Ammonia Injection: A Route to Clean Stacks" American Chemical Society, Washington, D.C. (1973) pp. 195-205.
Energy and Environmental Research Corporation
Heller Gregory A.
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