| Summary: | 碩士 === 國立中興大學 === 生物產業機電工程學系所 === 102 === The purpose of this study was examining the engine components damaged by hydrogen sulfide corrosion of biogas electricity generation system, and replacing corrosion-resistant materials for them. It cloud solve the problem of hydrogen sulfide corrosion. Therefore the recovery period of equipment should be extended and the maintenance cost be reduced.
Diesel engine was modified as biogas engine in this study. The components were replaced by bearing of battitt metal and oil seal of silicone rubber. The system were operated and evaluated in hog farm. Voltage and frequency were measured to examine the quality of electricity. The exit air of engine was evaluated by the concentrations of CO, SO2 and NOx for examining the emission standards. The economic analysis among varied power generation system was conducted.
Important results of this study were described as followings: Voltage (230V) and frequency (59.6 ~ 60.6 Hz) were maintained within the power quality standard (220±11 V；60±2.4 Hz). The concentrations of CO2 were measured from 762 to 1,060 ppm which were within the emission standard while the methane concentration was 52.8% of biogas. They were measured from 1,926 to 2,843 ppm which were over the emission standard while the methane concentration was 74.6% of biogas. The concentrations of NOx and SO2 were measured from 626 to 1662 ppm and 103 to 288 ppm, respectively, both of them were over the emission standard(250 ppm and 50 ppm, respectively) under the loading operation of biogas electricity generation system. The equipments were designed for biogas electricity generation which would create 240,300 kWh/year. The results of economic analysis show the investment cost of anti-corrosion biogas electricity generation system have the lowest value as NT 800,000 dollars and the recovery period be the lowest value as 1.5 year.
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