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Title: Method for reducing nitrogen oxides in combustion effluents

Abstract

Method for reducing nitrogen oxides (NO.sub.x) in the gas stream from the combustion of fossil fuels is disclosed. In a narrow gas temperature zone, NO.sub.x is converted to nitrogen by reaction with urea or ammonia with negligible remaining ammonia and other reaction pollutants. Specially designed injectors are used to introduce air atomized water droplets containing dissolved urea or ammonia into the gaseous combustion products in a manner that widely disperses the droplets exclusively in the optimum reaction temperature zone. The injector operates in a manner that forms droplet of a size that results in their vaporization exclusively in this optimum NO.sub.x -urea/ammonia reaction temperature zone. Also disclosed is a design of a system to effectively accomplish this injection.

Inventors:
 [1]
  1. Merion Station, PA
Issue Date:
Research Org.:
COAL TECH CORP
OSTI Identifier:
872945
Patent Number(s):
6048510
Assignee:
Coal Tech Corporation (Merion Station, PA)
Patent Classifications (CPCs):
F - MECHANICAL ENGINEERING F23 - COMBUSTION APPARATUS F23J - REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES
B - PERFORMING OPERATIONS B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL B01D - SEPARATION
DOE Contract Number:  
AC22-91PC91162
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
method; reducing; nitrogen; oxides; combustion; effluents; gas; stream; fossil; fuels; disclosed; narrow; temperature; zone; converted; reaction; urea; ammonia; negligible; remaining; pollutants; specially; designed; injectors; introduce; air; atomized; water; droplets; containing; dissolved; gaseous; products; manner; widely; disperses; exclusively; optimum; injector; operates; forms; droplet; size; results; vaporization; -urea; design; effectively; accomplish; injection; nitrogen oxide; gaseous combustion; gas temperature; containing dissolved; specially designed; combustion products; nitrogen oxides; gas stream; reaction temperature; combustion product; fossil fuel; temperature zone; water droplets; fossil fuels; reducing nitrogen; droplets containing; /423/

Citation Formats

Zauderer, Bert. Method for reducing nitrogen oxides in combustion effluents. United States: N. p., 2000. Web.
Zauderer, Bert. Method for reducing nitrogen oxides in combustion effluents. United States.
Zauderer, Bert. Sat . "Method for reducing nitrogen oxides in combustion effluents". United States. https://www.osti.gov/servlets/purl/872945.
@article{osti_872945,
title = {Method for reducing nitrogen oxides in combustion effluents},
author = {Zauderer, Bert},
abstractNote = {Method for reducing nitrogen oxides (NO.sub.x) in the gas stream from the combustion of fossil fuels is disclosed. In a narrow gas temperature zone, NO.sub.x is converted to nitrogen by reaction with urea or ammonia with negligible remaining ammonia and other reaction pollutants. Specially designed injectors are used to introduce air atomized water droplets containing dissolved urea or ammonia into the gaseous combustion products in a manner that widely disperses the droplets exclusively in the optimum reaction temperature zone. The injector operates in a manner that forms droplet of a size that results in their vaporization exclusively in this optimum NO.sub.x -urea/ammonia reaction temperature zone. Also disclosed is a design of a system to effectively accomplish this injection.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2000},
month = {1}
}

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