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沼气提纯（Biogas upgrading）是指去除沼气中的二氧化碳、水分及其他杂质，将其转化为甲烷含量高、热值达到天然气标准的高品质生物天然气的过程。经过提纯的沼气可广泛应用于车用燃气、民用管网或工业燃料，是实现有机废弃物高值化利用的关键环节。
Biogas upgrading refers to the process of removing carbon dioxide, water, and other impurities from biogas, converting it into high-quality biogas with high methane content and calorific value that meets natural gas standards. Purified biogas can be widely used in automotive gas, civilian pipelines, or industrial fuels, and is a key link in achieving high-value utilization of organic waste.
目前，主流的沼气提纯技术包括变压吸附法、加压水洗法和膜分离法。变压吸附法利用分子筛等吸附剂对二氧化碳的选择性吸附特性，在加压条件下吸附二氧化碳，减压后释放再生，该工艺甲烷回收率可达95%以上，且操作维护简单。加压水洗法则是利用水在加压条件下对二氧化碳溶解度远高于甲烷的物理特性，通过气液逆流接触实现脱碳，其运行费用较低且无需添加化学药剂。膜分离技术则依靠不同气体在压力驱动下透过高分子纤维膜的速率差异，让渗透速度快的二氧化碳透过膜壁，从而实现甲烷的富集。
At present, mainstream biogas purification technologies include pressure swing adsorption, pressurized water washing, and membrane separation. The pressure swing adsorption method utilizes the selective adsorption characteristics of molecular sieves and other adsorbents for carbon dioxide. Under pressurized conditions, carbon dioxide is adsorbed, and after depressurization, it is released for regeneration. The methane recovery rate of this process can reach over 95%, and the operation and maintenance are simple. The pressurized water washing method utilizes the physical property that water has a much higher solubility for carbon dioxide than methane under pressurized conditions, and achieves decarbonization through gas-liquid countercurrent contact. Its operating cost is low and no chemical agents need to be added. Membrane separation technology relies on the difference in the rate at which different gases pass through polymer fiber membranes under pressure, allowing carbon dioxide with a faster permeation rate to pass through the membrane wall, thereby achieving methane enrichment.
无论采用哪种提纯技术，其核心目标都是将甲烷浓度提升至97%左右。在工艺设计上，沼气在进入提纯系统前，经过严格的脱水与脱硫净化处理，以防止后续设备腐蚀或膜组件堵塞。提纯后的气体还需经过缓冲存贮单元进行稳压处理，以确保最终输出气源的稳定与安全。
Regardless of the purification technology used, the core goal is to increase methane concentration to around 97%. In terms of process design, biogas must undergo strict dehydration and desulfurization purification treatment before entering the purification system to prevent subsequent equipment corrosion or membrane component blockage. The purified gas also needs to be stabilized by a buffer storage unit to ensure the stability and safety of the final output gas source.
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