Method of conditioning flue gas
AssigneeApollo Technologies, Inc.
InventorsAlfred E. Kober, Ira Kukin
Life of this patent
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Abstract
The collection characteristics of particles entrained in a particle-laden gas for collection by an electrostatic precipitator are improved by injecting finely divided sodium and ammonium phosphate salts into a particle-laden gas stream formed by the burning of coal. Sufficient additive is injected to provide 24-1200 grams per metric ton of coal burned to form the gas. After injection, the stream is directed through a heat exchange means and finally into the precipitator to collect the particles therein.
Claims34
A method of conditioning a particle-laden gas formed by the burning of coal comprising forming a mixture of:
- (a) the particle-laden gas at a temperature of 100.degree.-900.degree. C., and
- (b) a finely divided substance selected from the group consisting of sodium and ammonium phosphate salts and mixtures thereof;
- said mixture containing 24-1200 grams of said substance per metric ton of coal burned to form said gas, and thereafter directing said gas stream into an electrostatic precipitator to collect said particles therein.
A method of improving the collection chracteristics of particles entrained in a stream of particle-laden gas formed by the burning of coal for collection by an electrostatic precipitator, comprising the steps of:
- (A) injecting a finely divided substance selected from the group consisting of sodium and ammonium phosphate salts and mixtures thereof into said stream of particle-laden gas while said gas has a temperature of 100.degree.-900.degree. C., sufficient substance being injected to provide 2.3-115 parts by weight of said substance per million parts by weight of gas;
- and
- (B) after said injection, directing said gas stream through a heat exchange means into an electrostatic precipitator to collect said particles therein.
The method of conditioning a particle-laden gas comprising forming a mixture of:
- (a) a particle-laden gas at a temperature of 100.degree.-900.degree. C., and
- (b) finely divided diammonium phosphate, said mixture containing 2.3-115 parts by weight of said diammonium phosphate per million parts by weight of said gas, and thereafter directing said gas stream into an electrostatic precipitator to collect said particles therein.
A method of improving the collection characteristics of particles entrained in a particle-laden gas stream for collection by an electrostatic precipitator, comprising the steps of:
- (a) injecting a finely divided substance selected from the group consisting of sodium and ammonium phosphate salts and mixtures thereof into a stream of particle-laden gas while said gas has a temperature of 100.degree.-900.degree. C., sufficient such substance being injected to provide 2.3-115 parts by weight of said substance per million parts by weight of said gas;
- (b) after said injection, directing said gas stream through a heat exchange means and into an electrostatic precipitator to collect said particles thereon.
Dependencies are inferred from the claim text.