| Biogas is a renewable and effective energy. The efficient and reliable biogas generator can serve the scattered farmer households living in remote mountainous areas as an emergency power supplier when electricity shortage aggravates or a grid failure suddenly occurs.The objective of this research is to study the combustion features of the small capacity biogas-altered generator which is to be used by the farmer family.Along with the features of biogas and its combustion characteristics analyzing, the feasibility study of a small capacity gasoline generator(2kW) changing fuel with biogas was carried out.The numerical simulation and research proposed a structural improvement in the design of the existing mixer by changing the air intake structure, increasing gas disturbance and setting a bypass to promote biogas combustion the device output performance and efficiency could be validly improved.According to the experiment scheme designed and planned hereby, the original gasoline- fueled single-phase synchronous generator was transformed into a dual- fuel intake experiment platform which could be fed either gasoline or biogas by adding mixer, reconfiguring structure of carburetor and adopting high-energy igniter.On the platform, to clarify the major factors affecting the output power and efficiency, a series of tests were undergone. As the results the adjustment ranges and reference values of the key parameters to the power and efficiency of the generator were presented, which included concentration of methane pressure air-fuel ratio and compression ratio.With the rated power, the following tests to the parameters of power quality and noises of generator reached a conclusion that the changed biogas-fueled power unit meets the industry standards.Based on these experiments the comparison between the gasoline-fueled and biogas-driven generator clearly shows that changing the fuel of a small power unit from gasoline to biogas can bring sound economic benefits. |
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