德赢官网 | 官网登录首页 煤层气在煤矿称为煤矿瓦斯。依据新的资源评价结果，我国陆上煤层气资源量36 8万亿立方米，与陆上常规自然气资源
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 in the air reaches 5%-16%, it will explode in open fire, which is the source of coal mine gas explosion accident.
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 application. Coal mine gas power generation can not only effectively deal with coal mine gas accidents, improve the safe consumption conditions of coal mine, but also help to increase the supply of clean energy, reduce greenhouse gas emissions, and achieve multiple purposes of maintaining life, resources and environment.
I. Low Concentration Gas Power Generation Technology
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 delivered, let alone applied.
Gas Generator Set
There are two problems to be dealt with in the demand of low-concentration gas power generation. One is that each coal mine is different and changing at any time. It is difficult for traditional generating units to "respond to changes with unchangeability"; the other is the problem of safe transmission of low-concentration gas.
The low-concentration gas generator unit adopts the technology of electric control gas mixer, which can automatically control the air-fuel ratio to adapt to the change of gas concentration. At the same time, it also deals with the safe delivery technology of low-concentration gas, and uses the fine water mist technology to deal with the safe delivery problem of low-concentration gas in the air.
II. Fundamental Request for Low Concentration Gas Power Generation
Firstly, according to the request of the national coal mine safety management department, the gas drainage system is installed, and the gas drainage system must operate normally; secondly, the gas drainage volume of the gas drainage system is about 1 million m3/year, and the gas concentration is between 6-25%. If these two conditions are reached, the foundation of gas power station can be established. If gas power station is established, the benign cycle of coal mine can be carried out, which is "promoting extraction by application and promoting safety by extraction".
III. Investment and Return of Gas Power Station
Power plant investment: 3000-4000 yuan/KW; unit guarantees continuous operation power of 400 kW, annual operation time can reach more than 300 days;
The annual generating capacity of a generating unit is 3 million kwh (consuming 1 million m3/year of pure gas);
The annual generating income of a generating unit is 1.2 million yuan (the electricity price is 0.4 yuan/KWh).
The annual operating cost of a generating unit includes oil consumption, personnel salary, equipment maintenance, equipment depreciation, etc. The generating cost is about 0.10 yuan/kWh.
Annual operating cost and cost of a generating unit = 0.10 yuan/kWh *3 million kWh = 300,000 yuan
Annual revenue of a generating unit:
Annual Income = Annual Generation Income - Annual Total Cost Cost = 1.2-300,000 yuan = 900,000 yuan
4. Application and Benefit of Waste Heat in Gas Power Station (Take 700GFW Unit as an Example)
1. Application Principle of Waste Heat