The Experimental Study on Combustion Stability and Performance of Biogas Power Generation by Changing Spark Timing
|關鍵字:||沼氣發電;沼氣水氣;點火正時;燃燒穩定性;Biogas generation;Water vapor in biogas;Spark timing;Combustion stability|
This study tested a 30kW-generator in a small biogas plant in Taiwan Sugar swine farm in Taichung. The biogas after desulfurization process still contains the water vapor. Hence, it is necessary to remove the water vapor in the intake biogas before it is fueled into the engine. In this study, the first work is to dehumidify the water vapor in intake biogas. In addition to these, the detailed intake biogas constitutes and their concentrations are also measured in order to get the real data. Secondly, install a complete ignition system, consisting spark plugs pressure sensor and rotary encoder, to record the in-cylinder pressure and crank angle of piston cylinder. In the present study, the engine power output of dehumidified biogas provides up to 5.9% with respective to the humid biogas at biogas supply rate of 220L/min at excess air ratio λ=1. Besides, the optimum spark timing of present engine locates at BTDC13 degree, where supply the highest power generation and thermal efficiency. Delaying or advancing the optimum spark timing leads to poorer power outputs. The spark timing of BTDC13 has lower coefficient of variation in indicated mean effective pressure (CoVIMEP) than delayed and advanced ones, where engine performs more stable indicated mean effect pressure (IMEP) during combustion. In addition, it found that the lower CoVIMEP makes the higher CH4 consumption ratio.
|Appears in Collections:||Thesis|
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