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Title: Flue gas desulfurization

Abstract

The invention involves a combustion process in which combustion gas containing sulfur oxide is directed past a series of heat exchangers to a stack and in which a sodium compound is added to the combustion gas in a temparature zone of above about 1400 K to form Na/sub 2/SO/sub 4/. Preferably, the temperature is above about 1800 K and the sodium compound is present as a vapor to provide a gas-gas reaction to form Na/sub 2/SO/sub 4/ as a liquid. Since liquid Na/sub 2/SO/sub 4/ may cause fouling of heat exchanger surfaces downstream from the combustion zone, the process advantageously includes the step of injecting a cooling gas downstream of the injection of the sodium compound yet upstream of one or more heat exchangers to cool the combustion gas to below about 1150 K and form solid Na/sub 2/SO/sub 4/. The cooling gas is preferably a portion of the combustion gas downstream which may be recycled for cooling. It is further advantageous to utilize an electrostatic precipitator downstream of the heat exchangers to recover the Na/sub 2/SO/sub 4/. It is also advantageous in the process to remove a portion of the combustion gas cleaned in the electrostatic precipitator and recyclemore » that portion upstream to use as the cooling gas. 3 figures.« less

Inventors:
;
Issue Date:
OSTI Identifier:
6148686
Application Number:
ON: TI85004788
Assignee:
Dept. of Energy EDB-85-034283
DOE Contract Number:  
W-31-109-ENG-38
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
01 COAL, LIGNITE, AND PEAT; 20 FOSSIL-FUELED POWER PLANTS; 42 ENGINEERING; FLUE GAS; DESULFURIZATION; SODIUM COMPOUNDS; CHEMICAL REACTIONS; SULFUR DIOXIDE; AIR POLLUTION CONTROL; FOULING; HEAT EXCHANGERS; RECYCLING; SODIUM SULFATES; VERY HIGH TEMPERATURE; ALKALI METAL COMPOUNDS; CHALCOGENIDES; CONTROL; GASEOUS WASTES; OXIDES; OXYGEN COMPOUNDS; POLLUTION CONTROL; SULFATES; SULFUR COMPOUNDS; SULFUR OXIDES; WASTES; 010800* - Coal, Lignite, & Peat- Waste Management; 200202 - Fossil-Fueled Power Plants- Waste Management- Noxious Gas & Particulate Emissions; 424000 - Engineering- Pollution Control Equipment- (1980-1989)

Citation Formats

Im, K.H., and Ahluwalia, R.K. Flue gas desulfurization. United States: N. p., 1984. Web.
Im, K.H., & Ahluwalia, R.K. Flue gas desulfurization. United States.
Im, K.H., and Ahluwalia, R.K. Tue . "Flue gas desulfurization". United States.
@article{osti_6148686,
title = {Flue gas desulfurization},
author = {Im, K.H. and Ahluwalia, R.K.},
abstractNote = {The invention involves a combustion process in which combustion gas containing sulfur oxide is directed past a series of heat exchangers to a stack and in which a sodium compound is added to the combustion gas in a temparature zone of above about 1400 K to form Na/sub 2/SO/sub 4/. Preferably, the temperature is above about 1800 K and the sodium compound is present as a vapor to provide a gas-gas reaction to form Na/sub 2/SO/sub 4/ as a liquid. Since liquid Na/sub 2/SO/sub 4/ may cause fouling of heat exchanger surfaces downstream from the combustion zone, the process advantageously includes the step of injecting a cooling gas downstream of the injection of the sodium compound yet upstream of one or more heat exchangers to cool the combustion gas to below about 1150 K and form solid Na/sub 2/SO/sub 4/. The cooling gas is preferably a portion of the combustion gas downstream which may be recycled for cooling. It is further advantageous to utilize an electrostatic precipitator downstream of the heat exchangers to recover the Na/sub 2/SO/sub 4/. It is also advantageous in the process to remove a portion of the combustion gas cleaned in the electrostatic precipitator and recycle that portion upstream to use as the cooling gas. 3 figures.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1984},
month = {5}
}