The research and development of biogas engine in China mainly concentrated in the internal combustion engine series, generally only for gasoline and diesel engines for shallow level conversion, to study on the thermal performance of the engine is not deep, because of poor quality, many problems appeared in the operation, for the user to bring inconvenience, thus affecting its development process. The root cause of this situation is that there is no deep research on the biogas engine, the technology is not passed, the lack of adequate production practice. The engine produces high heat load, poor reliability, difficult to start in the operation; in addition to the development of China's full combustion of biogas engine exhaust temperature is too high, the valve is easy to burn, the cylinder head become vulnerable and many other technical problems. Due to the existence of many problems in China's biogas engine, the previous application of domestic generator sets of biogas generator works have many long-term in a shutdown state. This makes the most of the subsequent development of the biogas project abandoned the biogas generator, manufacturers due to serious lack of technology is not mature enough due to the buyer's market, the biogas engine and the generator can not form scale production, the scientific research and production units of the lack of funds for research related, no enthusiasm for further research and development of the can not provide quality product, further hinder the process of market products, are unfavorable to the production of scientific research units and its development in the field of biogas generator.
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