Three-stage combustion demonstration projects update

Conference · Sat Jul 01 04:00:00 EDT 2000

OSTI ID:20034343

Ashworth, B; Zawadzki, E; Murrell, F; Shroyer, D; Gallenbach, T

The Ashworth Combustor is a pulverized coal-fired system that reduces the three major air pollutants (NO{sub x}, SO{sub 2} and particulate) associated with coal combustion. A 50 million Btu/hr combustion system will be retrofitted to a stoker boiler at the Lincoln Development Center in Lincoln, Illinois. Startup and testing re scheduled for mid 2000. With this technology, a two-stage slagging combustor is used with furnace over-fire air (the third stage). Pulverized coal/limestone are fired/calcined in the combustor. limestone (lime) is added to flux the slag and capture sulfur in a molten slag eutectic as a non-leaching calcium sulfide. Beside deep NO{sub x} reduction, 70%+SO{sub 2} and 70 to 80% particulate reductions are projected for the Ashworth Combustor. ClearStack, the Illinois Department of Commerce and Community Affairs Office of Coal Development and Marketing and the Ohio Coal Development Office (OCDO) are sponsoring the Ashworth Combustor demonstration. The Stage3Cyclone is a simple retrofit to cyclone-fired boilers to reduce NO{sub x} emissions to low levels. The existing cyclone barrels are used as the first stage of combustion and the conventional cyclone feed coal size (-1/4 inch) is used. Limestone is added to flux the coal ash. Second stage air is added in the furnace at the re-entrant throat level followed by over-fire air (OFA) injection in the upper part of the furnace. The technique is to be demonstrated on a southern Illinois Power Cooperative 33 MWe cyclone-fired unit in Marion, Illinois. Funding arrangements are being made and testing is projected for late 2000.

• Research Organization: ClearStack Combustion Corp. (US)
• OSTI ID: 20034343
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
AIR POLLUTION ABATEMENT
BOILERS
COAL
COMBUSTORS
CYCLONE SEPARATORS
DESIGN
FLY ASH
LIMESTONE
NITROGEN OXIDES
RETROFITTING
SORBENT INJECTION PROCESSES
STAGED COMBUSTION
SULFUR DIOXIDE