The main components of biogas are CH4 and CO2, and the high-purity methane gas obtained by separating CO2 from the mixed gas is called biological natural gas. Biological natural gas can be directly used as an alternative fuel for petrochemical natural gas. The increasing demand for natural gas by humans has driven the development of bio natural gas technology. This article analyzes the differences in characteristics between biogas and natural gas, as well as the possibility of biogas purification replacing natural gas. It reviews the progress of methods for biogas purification, including pressurized water washing, chemical absorption, pressure swing adsorption (PSA), membrane separation, low-temperature separation, and in-situ methane enrichment, Among them, the pressurized water washing method and PSA method have become the two most commercially available technologies due to their comprehensive advantages in technology and economy. The performance of membrane separation technology in reducing purification costs and simplifying purification systems makes it a promising technology for development. Methane in-situ enrichment technology has advantages in using high solid content raw materials to produce biological natural gas.

1、农村沼气的利用

1. Utilization of rural biogas

农村沼气综合利用能有效的为农民解决生活能源问题，以农村现有的植物秸秆、动物粪便为原料，利用沼气池等设施经过长时间的发酵产生沼气，为农民提供燃气、照明、有机肥料。

The comprehensive utilization of rural biogas can effectively solve the energy problem for farmers, using existing plant straw and animal manure as raw materials in rural areas, and utilizing biogas digesters and other facilities to produce biogas after long-term fermentation, providing gas, lighting, and organic fertilizers for farmers.

2、养殖业沼气的利用

2. Utilization of biogas in aquaculture industry

畜禽粪便投入沼气工程发酵后产生沼气，粪便经过发酵后，可直接用于作物肥料、养鱼、喂猪、浸种等，促进农业种养一体化。主要利用方式为：一是为周边居民提供燃气，二是通过发电为养殖场提供电力，余电上网。

Livestock and poultry manure is fermented into biogas engineering to produce biogas. After fermentation, the manure can be directly used for crop fertilizer, fish farming, pig feeding, seed soaking, etc., promoting the integration of agricultural planting and breeding. The main utilization methods are: firstly, to provide gas for surrounding residents; secondly, to provide electricity for breeding farms through power generation, while the remaining electricity is connected to the grid.

3、工业领域沼气的利用

3. Utilization of biogas in the industrial sector

工业领域的沼气利用主要集中在造纸、酿造、食品加工、污水处理等行业，以工业废弃物为原料进行发酵产生沼气，主要以发电和供热为主，可将沼气用于内燃机发电、大型燃煤锅炉的助燃或替代原煤，使用小型锅炉生产蒸汽等。

The utilization of biogas in the industrial field is mainly concentrated in industries such as papermaking, brewing, food processing, and sewage treatment. Industrial waste is used as raw materials for fermentation to produce biogas, mainly for power generation and heating. biogas can be used for internal combustion engine power generation, large coal-fired boilers to support combustion or replace raw coal, and small boilers to produce steam.

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This article provides assistance with biogas purification. For more related content, please click on I hope this article can be helpful to you. Thank you for reading!