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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.

Inventors:
 [1];  [2];  [3]
  1. Morgantown, WV
  2. Louisville, OH
  3. Orlando, FL
Publication Date:
Research Org.:
National Energy Technology Laboratory (NETL), Pittsburgh, PA, Morgantown, WV (United States)
OSTI Identifier:
871317
Patent Number(s):
US 5706645
Assignee:
United States of America as represented by United States (Washington, DC)
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
removal; oxides; nitrogen; gases; multi-stage; coal; combustion; polluting; gas; values; removed; off-gas; process; initial; carbonizing; reaction; firing; char; fluidized; bed; reactor; burning; reactions; topping; combustor; fuel-rich; zone; fuel-lean; improvement; means; directed; introducing; -free; oxidizing; compressor; air; completing; source; excess; fed; controlled; obtain; desired; stoichiometry; topping combustor; combustion process; coal combustion; oxidizing gas; bed reactor; fluidized bed; bed reaction; excess air; rich zone; multi-stage coal; stage coal; air fed; /60/

Citation Formats

Mollot, Darren J, Bonk, Donald L, and Dowdy, Thomas E. Removal of oxides of nitrogen from gases in multi-stage coal combustion. United States: N. p., 1998. Web.
Mollot, Darren J, Bonk, Donald L, & Dowdy, Thomas E. Removal of oxides of nitrogen from gases in multi-stage coal combustion. United States.
Mollot, Darren J, Bonk, Donald L, and Dowdy, Thomas E. Thu . "Removal of oxides of nitrogen from gases in multi-stage coal combustion". United States. https://www.osti.gov/servlets/purl/871317.
@article{osti_871317,
title = {Removal of oxides of nitrogen from gases in multi-stage coal combustion},
author = {Mollot, Darren J and Bonk, Donald L and Dowdy, Thomas 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.},
doi = {},
url = {https://www.osti.gov/biblio/871317}, journal = {},
number = ,
volume = ,
place = {United States},
year = {1998},
month = {1}
}

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