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Title: Removal of oxides of nitrogen from gases in multi-stage coal combustion

Abstract

Polluting NO{sub x} gas values are removed from off-gas of a multi-stage coal combustion process which includes an initial carbonizing reaction, firing of char from this reaction in a fluidized bed reactor, and burning of gases from the carbonizing and fluidized bed reactions in a topping combustor having a first, fuel-rich zone and a second, fuel-lean zone. The improvement by means of which NO{sub x} gases are removed is directed to introducing NO{sub x}-free oxidizing gas such as compressor air into the second, fuel-lean zone and completing combustion with this source of oxidizing gas. Excess air fed to the fluidized bed reactor is also controlled to obtain desired stoichiometry in the first, fuel-rich zone of the topping combustor. 2 figs.

Inventors:
; ;
Issue Date:
Sponsoring Org.:
USDOE, Washington, DC (United States)
OSTI Identifier:
570519
Patent Number(s):
5706645
Application Number:
PAN: 8-635,422
Assignee:
Dept. of Energy, Washington, DC (United States)
Resource Type:
Patent
Resource Relation:
Other Information: PBD: 13 Jan 1998
Country of Publication:
United States
Language:
English
Subject:
01 COAL, LIGNITE, AND PEAT; NITROGEN OXIDES; AIR POLLUTION ABATEMENT; COAL; FLUIDIZED-BED COMBUSTORS; CARBONIZATION; COAL GAS; EXHAUST GASES; DENITRIFICATION; COMBINED CYCLES; TOPPING CYCLES; CHARS

Citation Formats

Mollot, D J, Bonk, D L, and Dowdy, T E. Removal of oxides of nitrogen from gases in multi-stage coal combustion. United States: N. p., 1998. Web.
Mollot, D J, Bonk, D L, & Dowdy, T E. Removal of oxides of nitrogen from gases in multi-stage coal combustion. United States.
Mollot, D J, Bonk, D L, and Dowdy, T E. Tue . "Removal of oxides of nitrogen from gases in multi-stage coal combustion". United States.
@article{osti_570519,
title = {Removal of oxides of nitrogen from gases in multi-stage coal combustion},
author = {Mollot, D J and Bonk, D L and Dowdy, T E},
abstractNote = {Polluting NO{sub x} gas values are removed from off-gas of a multi-stage coal combustion process which includes an initial carbonizing reaction, firing of char from this reaction in a fluidized bed reactor, and burning of gases from the carbonizing and fluidized bed reactions in a topping combustor having a first, fuel-rich zone and a second, fuel-lean zone. The improvement by means of which NO{sub x} gases are removed is directed to introducing NO{sub x}-free oxidizing gas such as compressor air into the second, fuel-lean zone and completing combustion with this source of oxidizing gas. Excess air fed to the fluidized bed reactor is also controlled to obtain desired stoichiometry in the first, fuel-rich zone of the topping combustor. 2 figs.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1998},
month = {1}
}