Wet scrubbing of fly ash and SO/sub 2/
The scrubber on the Sherco plant of Northern States Power Company at Becker, Minn.--45 miles NW of Minneapolis-St. Paul--has been operating for more than one and a half years. The Sherco station of the NSP in Sherburne County has two 700-MW coal-fired units. Unit 1 started commercial operation May 1976 and Unit 2 in May 1977. The units fire about 400 tons of coal each hour and use about 3 tons of limestone per hour in the scrubbing operation. The coal contains about 9% ash and 0.8% sulfur. Stack gas exit conditions on units 1 and 2 are 0.04 grains/dscf of particulate matter and 350 ppM SO/sub 2/. The scrubbers remove in excess of 50% of the SO/sub 2/ and 99% of the particulate matter to achieve this condition. Units 1 and 2 have C-E boilers, GE turbines, and C-E scrubbers. These units represent a $368 million plant investment; the air pollution controls, including the C-E scrubbers, cost 55 million. Two additional units 3 and 4, are planned for 1981 and 1983, respectively. These units will have B and W (Babcock and Wilcox) boilers, Westinghouse turbines, and C-E scrubbers. The newer scrubbers will get the particulate loading down to an equivalent stack gas exit condition of 0.02 grains/dscf.
- OSTI ID:
- 5148269
- Journal Information:
- Environ. Sci. Technol.; (United States), Vol. 11:12
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
54 ENVIRONMENTAL SCIENCES
FLY ASH
AIR POLLUTION CONTROL
FOSSIL-FUEL POWER PLANTS
SCRUBBERS
AIR POLLUTION
COAL
COMBUSTION
LIMESTONE
MINNESOTA
PARTICLE SIZE
SULFUR
SULFUR DIOXIDE
AEROSOL WASTES
CARBONACEOUS MATERIALS
CARBONATE ROCKS
CHALCOGENIDES
CHEMICAL REACTIONS
ELEMENTS
ENERGY SOURCES
EQUIPMENT
FOSSIL FUELS
FUELS
NONMETALS
NORTH AMERICA
OXIDATION
OXIDES
OXYGEN COMPOUNDS
POLLUTION
POLLUTION CONTROL
POLLUTION CONTROL EQUIPMENT
POWER PLANTS
RESERVOIR ROCK
ROCKS
SEDIMENTARY ROCKS
SIZE
SULFUR COMPOUNDS
SULFUR OXIDES
THERMAL POWER PLANTS
USA
WASTES
424000* - Engineering- Pollution Control Equipment- (1980-1989)
500200 - Environment
Atmospheric- Chemicals Monitoring & Transport- (-1989)