Biogas purification accounts for about 10% of the total power in some Western European countries (Germany, Denmark, Sweden, etc.). Biogas purification skills, such as pressurized water washing, chemical absorption, pressure swing adsorption and membrane separation, have been commercialized. Among them, pressurized water washing and pressure swing adsorption have the highest utilization rate in European biogas purification market, accounting for 1/3 of each.
In China, the technology of biogas purification has been gradually developed in recent years, but the primary technology of biogas purification, including desulfurization, decarbonization and dehydration, has been widely used and developed in industrial gas purification projects such as synthetic ammonia.
As for desulfurization, it can be divided into dry and wet methods, in which the dry method mainly consists of activated carbon method and iron oxide method, and the wet method includes chemical method, physical method and physical and chemical method. In the case of low sulfur content, dry desulfurization can be used. In the case of high sulfur content, wet oxidation is the main method, and dry desulfurization is used to assist the combination.
In terms of decarbonization, physical methods such as pressurized water washing, pressure swing adsorption, membrane separation and chemical methods such as NDEA and propylene carbonate are the main methods. Pressure water washing and pressure swing adsorption are mature and stable processes, which are suitable for large-scale biogas projects with high operational reliability, more engineering experience and more advantages in methane recovery by pressure water washing.
As for dehydration, there are dehydration equipments in domestic gas filling mother stations. Physical adsorption dehydration method is generally used.
Through the above process, the purified gas can reach the vehicle gas specification, and the purified product gas can enter the city gas pipeline network.
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