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

Abstract

A method and apparatus are described 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 F to 2000 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 F to 900 F. Under certain conditions, calcium injection may be employed along with humidification of the flue gas stream for selective reduction of the pollutants. 7 figs.

Inventors:
;
Issue Date:
OSTI Identifier:
7279601
Patent Number(s):
5165903 A
Application Number:
PPN: US 7-796909
Assignee:
Public Service Co. of Colorado, Denver, CO (United States) PTO; EDB-94-086184
DOE Contract Number:  
FC22-91PC90550
Resource Type:
Patent
Resource Relation:
Patent File Date: 22 Nov 1991
Country of Publication:
United States
Language:
English
Subject:
01 COAL, LIGNITE, AND PEAT; FLUE GAS; DENITRIFICATION; DESULFURIZATION; NITROGEN OXIDES; AIR POLLUTION CONTROL; SULFUR DIOXIDE; FLUID INJECTION; STAGED COMBUSTION; CHALCOGENIDES; CHEMICAL REACTIONS; COMBUSTION; CONTROL; GASEOUS WASTES; NITROGEN COMPOUNDS; OXIDATION; OXIDES; OXYGEN COMPOUNDS; POLLUTION CONTROL; SULFUR COMPOUNDS; SULFUR OXIDES; THERMOCHEMICAL PROCESSES; WASTES; 010800* - Coal, Lignite, & Peat- Waste Management

Citation Formats

Hunt, T.G., and Offen, G.R. Integrated process and apparatus for control of pollutants in coal-fired boilers. United States: N. p., 1992. Web.
Hunt, T.G., & Offen, G.R. Integrated process and apparatus for control of pollutants in coal-fired boilers. United States.
Hunt, T.G., and Offen, G.R. Tue . "Integrated process and apparatus for control of pollutants in coal-fired boilers". United States.
@article{osti_7279601,
title = {Integrated process and apparatus for control of pollutants in coal-fired boilers},
author = {Hunt, T.G. and Offen, G.R.},
abstractNote = {A method and apparatus are described 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 F to 2000 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 F to 900 F. Under certain conditions, calcium injection may be employed along with humidification of the flue gas stream for selective reduction of the pollutants. 7 figs.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1992},
month = {11}
}