Advanced coal reburning and sorbent injection

Technical Report · Fri Jan 31 04:00:00 EST 1992

OSTI ID:7101049

Farzan, H; Fuller, T A ^[1]

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1. Babcock and Wilcox Co., Alliance, OH (United States). Contract Research Div.

The reburning process employs multiple combustion zones in the furnace. The main combustion zone is operated at a stoichiometry of 1.1 and has the majority of the fuel input. The balance of fuel is introduced above the main combustion zone in the reburning zone through reburn burners. The reburning fuel produces an oxygen deficient environment in the reburning zone. These reducing conditions convert a portion of the NO[sub x] produced in the main combustion zone to molecular nitrogen. The balance of the air is introduced through the overfire air (OFA) ports in order to complete the combustion of all the fuel introduced in the boiler. Sorbent is introduced in the upper furnace at temperatures of 2200 to 2300[degrees]F (prior to the superheater tube bank) to control SO[sub 2]. Alternately, hydrated sorbent can be injected in the rue gas duct downstream of the heating surfaces. This injection method requires the use of flue gas humidification. Pilot-scale combustion tests were performed in Babcock Wilcox's (B W's) 6-million Btu/hr small boiler simulator (SBS). The SBS was fired by a single, scaled-down version of B W's cyclone furnace. The small cyclone was attached to the front wall of the SBS. A single advanced reburn burner was installed in the center of the rear wall of the SBS just above the centerline of the cyclone furnace. Overfire air was introduced through two ports on the rear wall of the SBS just above the new reburn burner. The existing dry scrubber module was used to spray atomized water into the flue gas stream for the tests with humidification. The entire SBS facility was instrumented for real-time acquisition of combustion air and solids flow data as well as on-line gas analysis.

• Research Organization: Ohio Coal Development Office, Columbus, OH (United States); Babcock and Wilcox Co., Alliance, OH (United States). Contract Research Div.
• Sponsoring Organization: STOFOH; Ohio State Government, Columbus, OH (United States)
• OSTI ID: 7101049
• Report Number(s): OCDO-93006031; ON: TI93006031; CNN: CDO/R-89-28; CRD 1259
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
014000* -- Coal
Lignite
& Peat-- Combustion
AIR POLLUTION CONTROL
BURNERS
CARBONACEOUS MATERIALS
CHALCOGENIDES
CHEMICAL REACTIONS
COAL
COMBUSTION
COMBUSTORS
CONTROL
CYCLONE COMBUSTORS
ENERGY SOURCES
FOSSIL FUELS
FUEL-AIR RATIO
FUELS
MATERIALS
NITROGEN COMPOUNDS
NITROGEN OXIDES
OXIDATION
OXIDES
OXYGEN COMPOUNDS
POLLUTION CONTROL
SORBENT INJECTION PROCESSES
STAGED COMBUSTION
SULFUR COMPOUNDS
SULFUR DIOXIDE
SULFUR OXIDES
THERMOCHEMICAL PROCESSES