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

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

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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:: Hunt, T.G.; Offen, G.R.

Issue Date:: 1992-11-24

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

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                    Hunt, T.G., and Offen, G.R. Integrated process and apparatus for control of pollutants in coal-fired boilers.  United States: N. p., 1992. 
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                    Hunt, T.G., & Offen, G.R. Integrated process and apparatus for control of pollutants in coal-fired boilers.  United States.

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                    Hunt, T.G., and Offen, G.R. Tue .  
        "Integrated process and apparatus for control of pollutants in coal-fired boilers".  United States.

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@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}

}

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