The biogas project is not not not popularized on a large scale, but is not industrialized in China because of the low degree of industrialization. Biogas purification is also an important step in biogas engineering.
Taking Germany and Sweden as examples, the production scale of biogas projects in developed countries can be used for large-scale regional heating, power generation and automotive gas. The main reason is the difference of industrialization degree.
Domestic biogas digesters are the main type of biogas in China. Even in biogas engineering, the scale of fermentation tanks is relatively small. It is characterized by no heating or backward heating equipment (coil), no stirring or simple mechanical stirring, no pretreatment and so on. These are the reasons for low production, slow reaction speed and even abandonment of biogas reactors in China.
Biological reaction is very sensitive to temperature, which is also the reason why methane digester produces more gas in summer and less gas in winter. Therefore, the heat preservation of biogas reactor is one of the important factors to maintain stable methane production.
There are many successful large-scale biogas projects in China, such as Deqingyuan in Beijing, Mengniu Aoya in Inner Mongolia and so on.
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