Flue gas desulfurization

Patent · Tue May 01 00:00:00 EDT 1984

OSTI ID:6148686

Im, K H; Ahluwalia, R K

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.

• DOE Contract Number: W-31-109-ENG-38
• Assignee: Dept. of Energy
• Application Number: ON: TI85004788
• OSTI ID: 6148686
• Country of Publication: United States
• Language: English

Related Subjects

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)