In fact, biogas is the "biomass energy" in the energy structure, which is the combustible gas produced by the storage and fermentation of the past residues, waste plants and so on. The purification of biogas is also a sweating technology. Jinan Biogas Purification Company found that the current application of biogas is mostly concentrated in rural areas, and the wide range of application is relatively limited. After pyrolysis, the reasons are roughly the following:

1、相较于城市较为兴旺的燃气管网，沼气在乡村较为便当运用。除了建立本钱较为低廉之外，沼气能够大水平上处理乡村生活渣滓以及秸秆处置的问题。而城市无论在能源管网供给、渣滓废品处置等方面都成熟太多，加上城市的小区集中式生活，单独建立区域性沼气设备的本钱比乡村要高（主要是地价），而且关于沼渣的处置也不会像乡村那样便当（乡村能够用沼渣直接当肥料）

1. Compared with the more prosperous gas pipeline network in the city, biogas is more convenient to use in the countryside. In addition to the relatively low cost of establishment, biogas can maximize the treatment of rural residues and straw disposal. The cost of establishing regional biogas equipment alone is higher than that in the countryside (mainly land price), and the disposal of biogas residue will not be as convenient as that in the countryside (the countryside can use biogas residue as fertilizer directly).

2、城市关于生物质能的应用，主要是废品回收和渣滓直接燃烧发电。像城市这种大范围集中式渣滓处置方式，沼气产生的效率过低，无法应对城市渣滓处置的请求，还不如直接燃烧发电或填埋来的效率更高。

2. Urban applications of biomass energy are mainly waste recycling and direct combustion of waste to generate electricity. As a large-scale centralized waste disposal method, such as city, the efficiency of biogas generation is too low to respond to the request of urban waste disposal. It is better to burn directly to generate electricity or landfill to achieve higher efficiency.

3、沼气产生大的限制就是温度和湿度，只要温湿度适宜，产生沼气的细菌才会正常生存，从而产生沼气。因而，在广阔北方地域，在深秋到初春时节是沼气池中是很难产生沼气的。即使是有些地域对沼气池采取保温措施，其效率也会大打折扣。

3. The biggest limitation of biogas production is temperature and humidity. As long as the temperature and humidity are suitable, the bacteria that produce biogas will survive normally and produce biogas. Therefore, in the vast northern region of China, it is very difficult to produce biogas in biogas digesters from late autumn to early spring. Even in some areas, the efficiency of biogas digesters will be greatly reduced by adopting thermal insulation measures.

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