In recent years, a series of research work has been carried out in the field of biogas purification technology and equipment research and development. In the field of chemical absorption, PSA and other technical fields, commercially applicable purification equipment has been developed. As the equipment and technology of PSA, water washing and chemical absorption are relatively mature, their market share in the field of biogas purification exceeds 90%. Several biogas purification demonstration projects have been completed in China, such as Yantai double tower 40000 m3 biogas purification project, Longkou Yantai Huaneng company 30000 m3 biogas purification vehicle gas demonstration project, Nanyang Tianguan 100000 m3 biogas purification project, etc.
2015年，我国沼气发展进入转型升级期，国家支持建设规模化生物天然气项目，2015年全国建设25个，2016年全国建设22个，沼气提纯生物天然气技术迎来新的发展契机，项目要求日产天然气10000 m3以上，每小时处理沼气量应在700 m3以上，化学吸收和变压吸附技术能满足项目要求。四川某彩乐乐彩票平台研发的沼气提纯专用吸附剂，解决了变压吸附法甲烷损失大的缺点，进一步降低了运行成本，甲烷回收率超过99%，CH4含量97%～99%，能够满足沼气提纯的要求。该技术已在贵州省茅台生态循环经济产业示范园生物天然气及生物肥项目上应用（2015年生物天然气试点项目之一）。
In 2015, China's biogas development entered a period of transformation and upgrading. The state focused on supporting the construction of large-scale biogas projects. In 2015, there were 25 projects nationwide, and in 2016, there were 22 projects nationwide. Biogas purification and biogas technology ushered in a new development opportunity. The project requires a daily natural gas output of more than 10000 m3 and an hourly biogas treatment capacity of 700 Above m3, chemical absorption and PSA technology can meet the project requirements. The special adsorbent for biogas purification developed by a company in Sichuan has solved the problem of large loss of methane by PSA and further reduced the operation cost. The methane recovery rate is more than 99%, and the CH4 content is 97% - 99%, which can meet the requirements of biogas purification. This technology has been applied in the project of bio natural gas and bio fertilizer of Maotai eco circular economy industrial demonstration park in Guizhou Province (one of the pilot projects of bio natural gas in 2015).
Compared with the advanced level in the world, there is still a certain gap in basic research and complete set of equipment development, especially in the research and development of complete set of purification equipment suitable for a large number of medium-sized biogas projects.
The greenhouse effect of methane is 21 times that of carbon dioxide. 20% of the global greenhouse effect gases come from methane. Biogas purification and bio natural gas can use biogas with high value, effectively reduce the emission of biogas engineering due to the inadequate use of biogas, and further reduce carbon emissions. Biogas is a kind of renewable alternative energy, so biogas purification of biogas has double benefits of environmental protection and energy, and has a bright future.
In biogas purification technology, chemical absorption method, membrane separation method and pressure swing adsorption method are relatively mature purification technologies at home and abroad, which are widely used at home and abroad. They have different technical characteristics, and can be selected according to needs, such as membrane separation method for small biogas treatment, pressure swing adsorption method for small energy consumption for large biogas treatment.
Due to the high complexity and huge scale of modern energy system, it shows great inertia. It usually takes a long time to plan and build new energy infrastructure, which is a prominent obstacle to the development of new energy industrialization. Biogas purification and processing can completely replace natural gas, which can successfully avoid this obstacle. Therefore, with the increasing consumption of natural gas, the market scale of biogas purification and production will continue to increase, which is bound to promote the rapid development of biogas purification technology.
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