Coalbed methane is called coal mine gas in coal mine. According to the new resource evaluation results, China's onshore CBM resources amount to 36.8 trillion cubic meters, which is equivalent to the onshore conventional natural gas resources (38 trillion cubic meters), second only to Russia and Canada. The main component of coalbed methane is methane. When the concentration of methane reaches 5%-16% in the air, it will explode in open fire, which is the source of coal mine gas explosion. The greenhouse effect of coal bed methane (CBM) is about 21 times that of carbon dioxide (CO2) when it is discharged directly into the atmosphere without using it. Coal mine gas power generation can not only effectively deal with coal mine gas incidents, improve coal mine safety production conditions, but also help to increase the supply of clean energy, reduce greenhouse gas emissions, and achieve multiple objectives of protecting life, resources and environment.
Coal mine gas consists of high concentration gas and low concentration gas. High concentration gas refers to the gas whose concentration is more than 25%, and low concentration gas refers to the gas whose concentration is less than 25%. More than 60% of the gas in our country is low concentration gas containing less than 25% methane. According to the requirements of coal mine safety regulations, the gas concentration below 25% can not be stored and transported, let alone used. There are two problems to be dealt with in the demand of low concentration gas power generation. One is that each coal mine has its own difference and is changing at any time. It is difficult for traditional generating units to "respond to changes with unchangeability"; the other is the problem of safe transportation of low concentration gas. Electrically controlled gas mixer technology is used in low concentration gas generating units, which can automatically control air-fuel ratio to adapt to the change of gas concentration. Together, the technology of safe transportation of low concentration gas and water mist technology are used to deal with the problem of safe transportation of low concentration gas on the ground.
Academician Zhou of the Chinese Academy of Engineering believes that "low concentration gas generating units are suitable for the characteristics of small quantity of coal mines in China, and can be regarded as the golden key to solve the gas problem in coal mines in China". Since 2004, Shandong Green Ring Power began to develop and discuss "Coal Mine Gas Water Mist Transport and Power Generation Technology" and succeeded in the second year's test, which enabled the low concentration gas power generation technology to be rapidly developed. Now the total installed capacity has reached 435,000 KW, generating 2.61 billion KW. H. per year and using 870 million cubic meters of gas.
The new edition of "Coal Mine Safety Regulations" clearly stipulates that the concentration of gas below 30% is used for internal combustion engine power generation. Article 148, Item 5 of the Regulations stipulates that when the concentration of gas extracted is below 30%, it shall not be used as direct combustion of gas; when used for internal combustion engine power generation or other uses, the application and transportation of gas must comply with the rules of relevant standards and formulate safety technical measures. Shi. This provides a principle guarantee for low concentration gas power generation. More than 60% of the gas in coal mines in China is low concentration gas, which is the gas source guarantee of low concentration gas power generation in China. With the continuous improvement of low-concentration gas power generation technology, the low-concentration coal-bed methane power generation industry will have a benign scale, and will have more and more economic and social benefits.
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