Cofiring wood waste and coal in cyclone boilers: Test results and prospectus
Conference
·
OSTI ID:115260
- and others
Cofiring wood waste in coal-fired utility boilers has the potential to reduce fuel costs, support local economic development, and address environmental concerns ranging from NO{sub x} emissions to greenhouse gas emissions. Consequently, TVA and EPRI developed an extensive program initially involving case studies and calculations, and extending into the conduct of cofiring tests at Boiler No. 2 of the Allen Fossil Plant. This boiler is a 265 MW cyclone unit, and it was tested in August 1994. The wood waste cofired was sawdust obtained locally, and the coal employed was an eastern bituminous coal. During this test, measurements were made to evaluate the influence of cofiring on fuel preparation and handling, fuel management operations, boiler efficiencies and operating temperatures, and the formation and control of airborne emissions. The tests demonstrated the potential for significant technical, economic, and environmental benefits associated with wood cofiring, including improving dust control during fuel handling, achieving 100% boiler capacities while cofiring, experiencing minimum impacts on boiler efficiency, and achieving reductions in such pollutants as NO{sub x}. Those tests are being repeated, cofiring wood waste with Utah bituminous coal. This paper reports on the results of the test program to date, and it considers the implication of the test results. Specific attention is given to the quantitative results with respect to the following parameters: ability to achieve capacity, boiler efficiency, combustion temperatures and furnace exit temperatures, opacity, NO{sub x} emissions, and related performance measurements.
- Research Organization:
- National Renewable Energy Lab., Golden, CO (United States)
- OSTI ID:
- 115260
- Report Number(s):
- NREL/CP--200-8098; CONF-9508104--; ON: DE95009230
- Country of Publication:
- United States
- Language:
- English
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