Graduate Thesis Or Dissertation
 

Analysis of wood combustion and combustion systems for a combined cycle wood-fired power plant

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  • This report presents the study of wood combustion and combustion systems for a combined cycle wood-fired power plant. The power plant consists of a twin air cycle and a single steam cycle. The fuel for this power plant is wood and wood waste with particle size in the range of three inch minus and a moisture content of 35 to 60 percent wet basis. The distinguishing features of this power plant are: direct combustion of wood, indirect-fired gas turbine, and combined cycle with a gas turbine cycle and a Rankine steam cycle. The three alternative designs of this power plant were considered. System 2 is designed for dry fuel combustion, with a dryer utilized. System 5 is designed for wet fuel combustion; therefore, the dryer of system 2 is not used. In system 7, which is designed for wet fuel combustion, a trimburner is used to increase the inlet temperature of the gas turbine from 1450 F to 1612 F. The wood fuels have a wide range of particle size and moisture content which affect the combustion of the fuel. In this report the combustion of wood and the effects of variables such as moisture content, particle size, and excess air on combustion of wood have been analyzed, and the results of the analysis are presented. Because of the variety of wood combustion systems available, in this work several combustion systems have been reviewed with the purpose of recommending a combus tion system for the use in this power plant. An evaluation of wood combustion based on the principles of conservation of mass, the first law of thermodynamics, the second law of thermodynamics and a prescribed extent of completion is presented. A computer program based on this evaluation is provided. The results of analysis based on this model and the computer simulation of the power plant are presented. Recommendations for improved operating conditions of the combustor, selection of the combustion system, and improvements in power plant design and operation are made. Based on the analysis presented in this work, it is concluded that system 7 is the most efficient system among the three systems considered.
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