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)
- 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}
}