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Title: Integrated process and apparatus for control of pollutants in coal-fired boilers

Abstract

A method and apparatus for reducing SO.sub.x and NO.sub.x levels in flue gases generated by the combustion of coal in a boiler in which low NO.sub.x burners and air staging ports are utilized to inhibit the amount of NO.sub.x initially produced in the combustion of the coal, a selected concentration of urea is introduced downstream of the combustion zone after the temperature has been reduced to the range of 1300.degree. F. to 2000.degree. F., and a sodium-based reagent is introduced into the flue gas stream after further reducing the temperature of the stream to the range of 200.degree. F. to 900.degree. F. Under certain conditions, calcium injection may be employed along with humidification of the flue gas stream for selective reduction of the pollutants.

Inventors:
 [1];  [2]
  1. Aurora, CO
  2. Woodside, CA
Issue Date:
Research Org.:
Public Service Co. of Colorado, Denver, CO (United States)
OSTI Identifier:
868552
Patent Number(s):
5165903
Assignee:
Public Service Company of Colorado (Denver, CO)
DOE Contract Number:  
FC22-91PC90550
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
integrated; process; apparatus; control; pollutants; coal-fired; boilers; method; reducing; levels; flue; gases; generated; combustion; coal; boiler; burners; air; staging; ports; utilized; inhibit; amount; initially; produced; selected; concentration; urea; introduced; downstream; zone; temperature; reduced; range; 1300; degree; 2000; sodium-based; reagent; gas; stream; 200; 900; conditions; calcium; injection; employed; humidification; selective; reduction; selective reduction; gases generated; combustion zone; gas stream; flue gas; integrated process; flue gases; /423/

Citation Formats

Hunt, Terry G, and Offen, George R. Integrated process and apparatus for control of pollutants in coal-fired boilers. United States: N. p., 1992. Web.
Hunt, Terry G, & Offen, George R. Integrated process and apparatus for control of pollutants in coal-fired boilers. United States.
Hunt, Terry G, and Offen, George R. Wed . "Integrated process and apparatus for control of pollutants in coal-fired boilers". United States. https://www.osti.gov/servlets/purl/868552.
@article{osti_868552,
title = {Integrated process and apparatus for control of pollutants in coal-fired boilers},
author = {Hunt, Terry G and Offen, George R},
abstractNote = {A method and apparatus for reducing SO.sub.x and NO.sub.x levels in flue gases generated by the combustion of coal in a boiler in which low NO.sub.x burners and air staging ports are utilized to inhibit the amount of NO.sub.x initially produced in the combustion of the coal, a selected concentration of urea is introduced downstream of the combustion zone after the temperature has been reduced to the range of 1300.degree. F. to 2000.degree. F., and a sodium-based reagent is introduced into the flue gas stream after further reducing the temperature of the stream to the range of 200.degree. F. to 900.degree. F. Under certain conditions, calcium injection may be employed along with humidification of the flue gas stream for selective reduction of the pollutants.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1992},
month = {1}
}

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