Enhancing the use of coals by gas reburning-sorbent injection

Technical Report · Fri Jul 26 04:00:00 EDT 1991

OSTI ID:5193439

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. For sulfation of the sorbent to CaSO{sub 4}, an injection temperature of about 1230{degree}C is optimum, but calcium-sulfur reactions can also take place at lower temperatures. Thus, 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 air heater with H{sub 2}O added for humidification. The calcium sulfate or sulfite products are collected together with unreacted sorbent fly ash by the electrostatic precipitator. The specific goal of this project is to demonstrate NO{sub x} and SO{sub x} emission reductions of 60 percent and 50 percent, respectively, on two coal fired utility boilers having the design characteristics mentioned above. 4 tabs.

• Research Organization: Energy and Environmental Research Corp., Irvine, CA (United States)
• Sponsoring Organization: DOE; USDOE, Washington, DC (United States)
• DOE Contract Number: FC22-87PC79796
• OSTI ID: 5193439
• Report Number(s): DOE/PC/79796-T15; ON: DE91018339
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
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& Peat-- Waste Management
014000 -- Coal
Lignite
& Peat-- Combustion
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200202* -- Fossil-Fueled Power Plants-- Waste Management-- Noxious Gas & Particulate Emissions
54 ENVIRONMENTAL SCIENCES
540120 -- Environment
Atmospheric-- Chemicals Monitoring & Transport-- (1990-)
AIR POLLUTION CONTROL
AIR POLLUTION MONITORING
ALKALINE EARTH METAL COMPOUNDS
CALCIUM COMPOUNDS
CARBONACEOUS MATERIALS
CHALCOGENIDES
CHEMICAL REACTIONS
COAL
COMBUSTION
CONTROL
DEVELOPED COUNTRIES
DOCUMENT TYPES
ENERGY SOURCES
FEDERAL REGION V
FOSSIL FUELS
FOSSIL-FUEL POWER PLANTS
FUELS
ILLINOIS
MATERIALS
MONITORING
NITROGEN COMPOUNDS
NITROGEN OXIDES
NORTH AMERICA
OXIDATION
OXIDES
OXYGEN COMPOUNDS
POLLUTION CONTROL
POWER PLANTS
PROGRESS REPORT
SORBENT INJECTION PROCESSES
SORPTION
SORPTIVE PROPERTIES
STAGED COMBUSTION
SULFUR COMPOUNDS
SULFUR OXIDES
SURFACE PROPERTIES
THERMAL POWER PLANTS
THERMOCHEMICAL PROCESSES
USA