Chemistry of inorganic compounds – Modifying or removing component of normally gaseous mixture – Nitrogen or nitrogenous component
Patent
1997-04-16
2000-05-16
Langel, Wayne
Chemistry of inorganic compounds
Modifying or removing component of normally gaseous mixture
Nitrogen or nitrogenous component
423219, B01D 5356
Patent
active
060633484
ABSTRACT:
A system and method for the reduction of NO.sub.x in a flue gas are disclosed. A P.sub.4 in water liquid/liquid emulsion is injected into a flue gas having a temperature of about 180.degree. C. to about 280.degree. C. to induce phosphorus-accelerated oxidation of the NO in the flue gas. NO.sub.2 and phosphorus oxides are subsequently removed from the flue gas stream at a location sufficiently downstream of the injection site that the oxidation of NO in the flue gas is substantially complete prior to the removal of NO.sub.2. This significantly improves the NO.sub.x recovery rate of the present system and method over those of the prior art. The system can be retrofitted to the waste gas stream of any stationary combustion source regardless of the fuel burned. The system is advantageously used in connection with a wet scrubber for the removal of NO.sub.2 and other water soluble flue gas components. Injection of the emulsion results in the creation of ozone by means of the controlled oxidation of white phosphorus. The ozone reacts with nitrogen oxide (NO), which generally accounts for 90% of flue gas NO.sub.x, to produce nitrogen dioxide (NO.sub.2). The reaction products (NO.sub.2 and the P.sub.4 O.sub.10,) can be removed from the flue gas together with SO.sub.2 and particulates in the wet scrubber wherein they are efficiently transferred from the gaseous phase to the buffered scrubbing liquid. In the scrubber, the temperature gradient is preferably set through the dew point, so that it recovers both latent as well as sensible heat energy from the flue gas which energy can be sold to commercial or residential consumers to recover at least a part of the capital costs (purchase and operation) associated with the system.
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Hinke Joseph
Hinke Thomas V.
DiMauro Peter
Langel Wayne
Thermal Energy International Inc.
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