由于沼气中甲烷含量较低，其高位发热值只有23.9MJ/m?(甲烷含量60%)，而纯甲烷高位发热值为39.78MJ/m?。作为车用燃料或者管道天然气燃料其高位发热值要求大于31.4MJ/m?，则要求沼气中甲烷浓度至少提高到88%以上，即要脱除多余CO2。沼气脱碳技术多源于天然气、合成氨变换气脱碳技术，包括物理溶液吸收法、化学吸收法、变压吸附法、膜分离法、低温深冷法等。

Due to the low methane content in biogas, its high calorific value is only 23.9 MJ/m? The methane content is 60%, while the high calorific value of pure methane is 39.78MJ/m?. As a vehicle fuel or pipeline natural gas fuel, its high heating value is required to be greater than 31.4MJ/m?, It is required that the methane concentration in biogas be increased to at least 88% or above, that is, excess CO2 must be removed. Biogas decarbonization technology mostly originates from natural gas and synthetic ammonia conversion gas decarbonization technology, including physical solution absorption method, chemical absorption method, pressure swing adsorption method, membrane separation method, low-temperature cryogenic method, etc.

（1）加压水洗法

(1) Pressurized water washing method

提纯效率高(>97% CH4)，甲烷损失小(<2%)；当H2S<300ppm可同时去除；易操作，溶剂易再生，耐受一定的杂质；通过改变压力和温度可调整处理能力。

High purification efficiency (>97% CH4), low methane loss (<2%); When H2S<300ppm, it can be removed simultaneously; Easy to operate, solvent easy to regenerate, resistant to certain impurities; The processing capacity can be adjusted by changing the pressure and temperature.

（2）碳酸丙烯酯法

(2) Propylene carbonate method

提纯效率高(>97% CH4)，吸收能力大，相比水洗法更节能。溶剂可再生；可同时去除H2S、有机硫化物和水。

High purification efficiency (>97% CH4), large absorption capacity, and more energy-saving compared to water washing method. Renewable solvents; It can simultaneously remove H2S, organic sulfides, and water.

（3）聚乙二醇法

(3) Polyethylene glycol method

提纯效率高(>97% CH4)，吸收能力大，甲烷损失小；可同时去除H2S、有机硫和水；相比水洗法更节能，溶剂可再生、挥发性小。

High purification efficiency (>97% CH4), large absorption capacity, and low methane loss; Can simultaneously remove H2S, organic sulfur, and water; Compared to water washing method, it is more energy-efficient, with renewable solvents and less volatility.

（4）醇胺法

(4) Alcoholic amine method

提纯效率高(>97% CH4)，吸收能力大，甲烷损失小(<0.1%)；溶剂可再生、操作成本低。

High purification efficiency (>97% CH4), large absorption capacity, and small methane loss (<0.1%); Renewable solvents with low operating costs.

（5）膜分离法

(5) Membrane separation method

可靠，操作简单；同时去除H2S和水；处理量小时不增加单位成本；气/气去 除效率：<92% CH4(一步)或者>96%；CH4气/液 去除效率：>96% CH4，可得到纯CO2。

Reliable and easy to operate; Simultaneously removing H2S and water; No increase in unit cost per hour of processing capacity; Gas/gas removal efficiency:<92% CH4 (one step) or>96%; CH4 gas/liquid removal efficiency:>96% CH4, pure CO2 can be obtained.

（6）变压吸附法

(6) Pressure swing adsorption method

提纯效率高(95%~98% CH4)；能耗低；高压但可回收；同时去除O2和N2，耐受一定的杂质，也适合低处理量。

High purification efficiency (95%~98% CH4); Low energy consumption; High pressure but recyclable; Simultaneously removing O2 and N2, tolerating certain impurities, and also suitable for low processing capacity.

（7）低温分离法

(7) Low temperature separation method

提纯效率高(90%~98% CH4)；易得到液化生物甲烷。

High purification efficiency (90%~98% CH4); Easy to obtain liquefied biomethane.

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