Advanced slagging coal combustor utility demonstration
The TRW entrained coal fired combustor consists of two (2) cylindrical sections followed by a short duct that connects the combustor to the boiler. The entire assembly is water-cooled and uses mild steel tubing in a manner similar to conventional boiler waterwall construction. A separate precombustor burns about 25% of the coal, and the combustion air to the main (or slagging-stage) combustor is preheated by mixing it with the hot gases exhausted from the precombustor. The preheated air enters the main combustor section tangentially to impart a swirling motion to the coal and air. The balance of the coal is injected axially at the front end of the cylindrical section. Molten slag collects on the walls of the combustor and flows toward an opening in the bottom of the main combustor where it falls into a water-filled slag tank. The slagging combustor is inclined slightly from horizontal to aid in the flow of the molten slag. Some slag solidifies on the water-cooled surface and serves to insulate and protect the metal walls from erosion and excessive temperatures. This main combustion section operates at a slight air deficiency to reduce the amount of NO{sub x} produced. The combustion products then travel through a vertical slag separation section and on to the connecting duct, where they are then mixed with sufficient air to complete the combustion reactions that take place in the boiler. A calcium-based sorbent is injected into the gases near the exit of the combustor to accomplish the removal of SO{sub 2}. Prior to proceeding with the DOE-sponsored Utility Demonstration Project, TRW had accumulated in excess of ten years of experience on this type of combustion system involving well over 1,100 tests on eight combustors ranging in size from 1 MMBTU/HR to 180 MMBTU/HR. This report describes the components as well as environmental history and permitting.
- Research Organization:
- TRW, Inc., Stony Point, NY (United States)
- Sponsoring Organization:
- DOE; USDOE, Washington, DC (United States)
- DOE Contract Number:
- FC22-89PC88750
- OSTI ID:
- 5507077
- Report Number(s):
- DOE/PC/88750-T6-Vol.1; ON: DE91013142
- Country of Publication:
- United States
- Language:
- English
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AIR POLLUTION CONTROL
BOILERS
CARBONACEOUS MATERIALS
CHEMICAL REACTIONS
COAL
COMBUSTION
COMBUSTORS
CONTROL
CORROSION
DESIGN
DIAGRAMS
DOCUMENT TYPES
ENERGY SOURCES
ENGINEERING DRAWINGS
ENTRAINMENT
ENVIRONMENT
FOSSIL FUELS
FUEL FEEDING SYSTEMS
FUEL SYSTEMS
FUELS
MATERIALS
MODIFICATIONS
OXIDATION
POLLUTION CONTROL
PROGRESS REPORT
THERMOCHEMICAL PROCESSES