... composition in biogas fuel changes, cross section of biogas supplying pipe should be changed. - For ZH1115 biogas engine with original air supply pipe, the equivalent diameter of biogas supplying ... out by supplying biogas through filtering chamber which contains rust of iron or diatomite. 1.3. Biogas engines In Vietnam, the engine which uses biogas as a fuel can be the biogas engines ... ignition biogas engine take advantages of low speed and high compression ratio of the diesel engines to improve the capacity of the engine with biogas. On the other hand, in the operation the biogas...