曾几何时，养殖场的沼气被直接“点天灯”烧掉，污水处理厂的沼气被白白排放。如今，沼气脱硫技术的成熟让这些被浪费的沼气有了“用武之地”——经过脱硫净化后，沼气可以驱动发电机组发电、可以提纯为生物天然气并入管网、可以替代化石能源。沼气脱硫，正是这场“变废为宝”革命的第一道关口。

Once upon a time, the biogas from breeding farms was directly burned by "sky lanterns", and the biogas from sewage treatment plants was discharged in vain. Nowadays, the maturity of biogas desulfurization technology has given these wasted biogas a "place to use" - after desulfurization and purification, biogas can drive power generation units, be purified into bio natural gas and integrated into pipelines, and can replace fossil fuels. Biogas desulfurization is the first hurdle in this "turning waste into treasure" revolution.

沼气脱硫的必要性源于硫化氢的“破坏力”。沼气从厌氧发酵装置产出时，非常是在中温或高温发酵时，携带有大量的H?S。由于沼气中含有大量水蒸气，水与H?S共同作用，加速了金属管道、阀门和流量计的腐蚀和堵塞。H?S燃烧后生成的SO?，与燃烧产物中的水蒸气结合成亚硫酸，进一步腐蚀设备金属表面，同时造成大气环境污染，影响人体健康。因此，在使用沼气之前，脱除H?S是必不可少的一环。

The necessity of biogas desulfurization stems from the destructive power of hydrogen sulfide. When biogas is produced from anaerobic fermentation equipment, especially during medium or high temperature fermentation, it carries a large amount of H? S. Due to the presence of a large amount of water vapor in biogas, the combined action of water and H2S accelerates the corrosion and blockage of metal pipelines, valves, and flow meters. The SO? Generated after H? S combustion combines with the water vapor in the combustion products to form sulfurous acid, which further corrodes the metal surface of equipment and causes atmospheric pollution, affecting human health. Therefore, removing H2S is an essential step before using biogas.

沼气脱硫的技术进化正在加速。传统的干法脱硫虽然简单，但脱硫剂频繁更换导致运行成本居高不下。湿法脱硫通过碱液吸附结合催化剂再生，降低了劳动强度。而生物脱硫作为第三代技术，通过氧化还原电位调控实现选择性转化，将硫化氢转化为单质硫，实现了“零化学药剂消耗”的理想状态。近年来，络合铁脱硫工艺作为新兴的湿法氧化脱硫技术，脱硫效率高，已应用于沼气废液脱硫等领域。络合铁脱硫技术是一种以络合铁溶液为催化剂的湿式氧化还原脱除H?S的方法，能一步将H?S转变成元素S，H?S脱除率可达99%以上。

The technological evolution of biogas desulfurization is accelerating. Although traditional dry desulfurization is simple, frequent replacement of desulfurizers leads to high operating costs. Wet desulfurization reduces labor intensity by adsorbing alkaline solution and regenerating catalyst. As a third-generation technology, biological desulfurization achieves selective conversion by regulating the redox potential, converting hydrogen sulfide into elemental sulfur and achieving the ideal state of "zero chemical consumption". In recent years, the chelated iron desulfurization process, as an emerging wet oxidation desulfurization technology, has high desulfurization efficiency and has been applied in fields such as biogas waste liquid desulfurization. Complex iron desulfurization technology is a wet oxidation-reduction method using complex iron solution as a catalyst to remove H-S, which can convert H-S into elemental S in one step? The removal rate of S can reach over 99%.

沼气脱硫的产业价值正在被越来越多的项目所验证。北京市小红门再生水厂新建4台燃气内燃发电机组，总装机4.8兆瓦，通过准确的负荷匹配与系统集成，将沼气资源转化为清洁电力。该项目的沼气处理系统从前端的生物脱硫、两级增压与精密的干式脱硫，到后端的尾气脱硝、脱碳处理，每一个环节均以提升沼气品质为目标，为发电机组持续提供“高品质沼气”。定远皖能环保电厂生物质沼气资源化利用项目，含沼气脱硫净化和脱碳提纯系统，将净化后的沼气输送至下游城镇燃气接驳。扬州市某厨余垃圾资源化利用项目的沼气生物脱硫实践，为国内同类型项目调试提供了宝贵参考。

The industrial value of biogas desulfurization is being increasingly validated by more and more projects. Beijing Xiaohongmen Reclaimed Water Plant has newly built 4 gas-fired internal combustion generator units with a total installed capacity of 4.8 megawatts. Through precise load matching and system integration, biogas resources are efficiently converted into clean electricity. The biogas treatment system of this project aims to improve the quality of biogas at every stage, from front-end biological desulfurization, two-stage boosting and precision dry desulfurization, to back-end tail gas denitrification and decarbonization treatment, providing continuous "high-quality biogas" for power generation units. The biomass biogas resource utilization project of Dingyuan Wanneng Environmental Protection Power Plant includes a biogas desulfurization purification and decarbonization purification system, which transports the purified biogas to downstream urban gas connections. The practice of biogas biological desulfurization in a kitchen waste resource utilization project in Yangzhou City provides valuable reference for the commissioning of similar projects in China.

从“点火放空”到“变废为宝”，沼气脱硫正在用技术的进化，将每一立方米沼气从“污染源”变成“能源宝”。当脱硫后的沼气在发电机组中燃烧、在燃气管网中流动，我们听到的不仅是能量的转化，更是循环经济时代的脚步声。

From "ignition and venting" to "turning waste into treasure", biogas desulfurization is using technological evolution to turn every cubic meter of biogas from a "pollution source" into an "energy treasure". When the desulfurized biogas is burned in the generator set and flows in the gas pipeline network, what we hear is not only the conversion of energy, but also the footsteps of the circular economy era.

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