The purpose of biogas purification is to remove impurities that have adverse effects on subsequent processes, including hydrogen sulfide and water. Methane contains more hydrogen sulfide and saturated water vapor. As the temperature decreases, water vapor condenses into water and separates from hydrogen sulfide, causing corrosion to pipelines and equipment. In addition, the moisture in biogas will condense, so if the pipe insulation is not good, it is easy to form pipe blockage in winter, affecting the normal operation of the valve. In addition, from the perspective of environmental protection, putting out sulfur dioxide produced by hydrogen sulfide with biogas will pollute the environment.

物理、化学和生物方法可用于去除沼气中的硫化氢。物理脱硫法一般采用活性炭法；化学脱硫法中干法脱硫常用氧化铁脱硫剂，化学脱硫法中湿法脱硫常用湿法888脱硫和络合铁脱硫。生物法主要指生物脱硫。选择详细计划时，应考虑沼气中硫化氢的含量和要求的去除水平。

Physical, chemical and biological methods can be used to remove hydrogen sulfide from biogas. Physical desulfurization method generally adopts activated carbon method; Iron oxide desulfurizer is commonly used for dry desulfurization in chemical desulfurization method, and wet 888 desulfurization and complex iron desulfurization are commonly used for wet desulfurization in chemical desulfurization method. Biological method mainly refers to biological desulfurization. When selecting the detailed plan, the content of hydrogen sulfide in biogas and the required removal level should be considered.

沼气脱水主要包括重力脱水、低温冷凝和分子筛等深度脱水。

Biogas dehydration mainly includes gravity dehydration, low-temperature condensation, molecular sieve and other deep dehydration.

yl6809永利中的脱硫塔通常采用常压干法脱硫，将氧化铁脱硫剂置于脱硫塔中进行脱硫；脱硫前通常先脱水，因此在脱硫塔前放置一台汽水分离器。沼气进入脱硫塔脱硫前，先经过汽水分离器脱水；设置精细过滤器，设计压差小，过滤面积大，可有效拦截细小杂质，满足应用要求，提高沼气应用效率。为了避免在运行过程中产生热量，有时需要在净化系统中设置冷水机组。气体输送泵和阻火器是系统中必不可少的辅助部件。

The desulfurization tower in biogas purification usually adopts atmospheric pressure dry desulfurization, and the iron oxide desulfurizer is placed in the desulfurization tower for desulfurization; Dehydration is usually carried out before desulfurization, so a steam water separator is placed in front of the desulfurization tower. Before entering the desulfurization tower for desulfurization, the biogas shall be dewatered through the steam water separator; The fine filter with small design pressure difference and large filtering area can effectively intercept small impurities, meet the application requirements and improve the application efficiency of biogas. In order to avoid heat generation during operation, sometimes it is necessary to set up a chiller in the purification system. Gas delivery pump and flame arrester are essential auxiliary components in the system.

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