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. With the decrease of temperature, water vapor condenses into water and separates from hydrogen sulfide, causing corrosion to pipelines and equipment. In addition, the moisture in the 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.
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 888 wet 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 shall be considered.
Biogas dehydration mainly includes gravity dehydration, low-temperature condensation, molecular sieve and other deep dehydration.
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; Fine filter is set with small design pressure difference and large filtering area, which can intercept small impurities, meet application requirements and improve biogas application efficiency. In order to avoid heat generation during operation, it is sometimes necessary to set a water chiller in the purification system. Gas delivery pump and flame arrester are indispensable auxiliary components in the system.
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