Enhancing the use of coals by gas reburning-sorbent injection

Technical Report · Mon Jul 15 00:00:00 EDT 1991

OSTI ID:5342280

This clean coal technology project will demonstrate a combination of two developed technologies to reduce both NO{sub x} and SO{sub x} emissions: gas reburning and calcium based dry sorbent injection. The demonstrations will be conducted on two pre-NSPS utility boilers representative of the US boilers which contribute significantly to the inventory of acid rain precursor emissions: tangentially fired and cyclone fired units. Gas reburning is a combustion modification technique that consists of firing 80--85 percent of the fuel corresponding to the total heat release in the lower furnace. Reduction of NO{sub x} to molecular nitrogen (N{sub 2}) is accomplished via the downstream injection of the remaining fuel requirement in the form of natural gas (which also reduces the total SO{sub x} emissions). In a third stage, burnout air is injected at lower temperatures in the upper furnace to complete the combustion process without generating significant additional NO{sub x}. Dry sorbent injection consists of injecting calcium based sorbents (such as limestone, dolomite, or hydrated lime) into the combustion products. The sorbent may be injected at different locations, such as with the burnout air, at the exit from the superheater, or into the ducting downstream of the boiler with H{sub 2}O added for humidification. The calcium sulfate and sulfite products are collected together with unreacted sorbent by the particulate collection device, usually an electrostatic precipitator or bag filter. Host Site Agreements have been signed with three utility companies in the State of Illinois: Illinois Power Company (Test Site A, Hennepin Unit 1, 71 MW{sub net} tangentially fired boiler in Hennepin), Central Illinois Light Company (Test Site B, Edwards Unit 1, 117 MW{sub net} front wall fired boiler in Bartonville), and City Water Light and Power (Test Site C, Lakeside Unit 7, 33 MW{sub net} cyclone fired boiler in Springfield). Progress is discussed.

• Research Organization: Energy and Environmental Research Corp., Irvine, CA (United States)
• Sponsoring Organization: USDOE; USDOE, Washington, DC (United States)
• DOE Contract Number: FC22-87PC79796
• OSTI ID: 5342280
• Report Number(s): DOE/PC/79796-T14; ON: DE91018075
• Country of Publication: United States
• Language: English

Related Subjects

20 FOSSIL-FUELED POWER PLANTS
01 COAL, LIGNITE, AND PEAT
54 ENVIRONMENTAL SCIENCES
NITROGEN OXIDES
REDUCTION
SULFUR OXIDES
SORPTION
AIR POLLUTION ABATEMENT
AIR POLLUTION CONTROL
COAL
COMBUSTION
FOSSIL-FUEL POWER PLANTS
ILLINOIS
PROGRESS REPORT
SORBENT INJECTION PROCESSES
STAGED COMBUSTION
CARBONACEOUS MATERIALS
CHALCOGENIDES
CHEMICAL REACTIONS
CONTROL
DEVELOPED COUNTRIES
DOCUMENT TYPES
ENERGY SOURCES
FEDERAL REGION V
FOSSIL FUELS
FUELS
MATERIALS
NITROGEN COMPOUNDS
NORTH AMERICA
OXIDATION
OXIDES
OXYGEN COMPOUNDS
POLLUTION ABATEMENT
POLLUTION CONTROL
POWER PLANTS
SULFUR COMPOUNDS
THERMAL POWER PLANTS
THERMOCHEMICAL PROCESSES
USA
200202* - Fossil-Fueled Power Plants- Waste Management- Noxious Gas & Particulate Emissions
010800 - Coal
Lignite
& Peat- Waste Management
540120 - Environment
Atmospheric- Chemicals Monitoring & Transport- (1990-)