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首页> 美国政府科技报告 >Co-Firing of Natural Gas and Coal. Annual Report, October 1990-September 1991
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Co-Firing of Natural Gas and Coal. Annual Report, October 1990-September 1991

机译：天然气和煤炭的共同燃烧。年度报告，1990年10月至1991年9月

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Fundamental studies of combined natural gas and coal combustion were conducted ina Drop Tube Furnace Facility (DTFF). A two-color pyrometer for particle temperature measurements and an imaging system for particle size and morphology were used to obtain the data required to determine particle burning rate. A detailed image analysis study shows that two dimensional images and a discrete revolution technique provide ensemble average errors of less than 20 per cent for particle surface area and surface area-to-volume ratio compared to errors of over 50 per cent that were found with conventional size estimates based on a single characteristic dimension. Temperature and burning rate data were obtained and analyzed as a function of methane addition, oxygen concentration, coal type and residence time. For similar oxygen concentrations, methane addition does not significantly alter the carbon burning rate. However, the methane addition does provide for more rapid devolatilization and ignition (in agreement with the author's previous ignition delay studies). A diffusion limited particle burning rate model, which uses local oxygen concentrations, adequately predicts particle temperatures and, hence, particle burning rates. Solids sampling is nearly completed for a series of experiments which includes variations in coal type, oxygen concentration and methane concentration. Ash collected in these experiments is currently under analysis to determine the amount and type of sulfur retained.

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