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DEVELOPMENT OF CRITERIA FOR EXTENSION OF APPLICABILITY OF LOW-EMISSION, HIGH-EFFICIENCY COAL BURNERS: FOURTH ANNUAL REPORT
Citation:
Payne, R., P. Case, M. Heap, J. Lee, AND C. McKinnon. DEVELOPMENT OF CRITERIA FOR EXTENSION OF APPLICABILITY OF LOW-EMISSION, HIGH-EFFICIENCY COAL BURNERS: FOURTH ANNUAL REPORT. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/7-84/087.
Description:
The report summarizes technical progress during the fourth year of effort on EPA contract 68-02-2667. NOx and SOx emission characteristics of two low-NOx distributed-mixing burners were tested with three coals in a large water-tube simulator furnace (50-70 million Btu/hr firing rate). Increasing burner load, burner zone stoichiometry, or overall excess air increased NOx emissions. Staging was limited by increases in CO emissions and problems with flame stability at burner zone stoichiometries below 0.6. The feasibility of using dry sorbents injected directly into the furnace for SO2 emission control was investigated. Sorbent type (Ca (OH)2 vs. CaCO3) and injection location had a small effect on sulfur capture. Fuel sulfur content also affected sulfur capture. Sulfur captures on the order of 40-50 percent were obtained at Ca/S molar ratios of 2.0. Parametric studies of the sulfur capture process were performed in a specially constructed Boiler Simulator Furnace fired at 1.0 million Btu/hr. Under fuel-lean conditions, thermal history exerted controlling influence on sulfur capture. Firing and heat extraction rates strongly influenced sulfur capture due to their effect on thermal history. Sorbent location, burner zone stoichiometry, overall excess air, and tertiary air velocity had secondary effects on capture.