The purpose of biogas purification is to remove impurities, including hydrogen sulfide and water, which will have adverse effects on the subsequent process.
Biogas contains more hydrogen sulfide and saturated water vapor. With the decrease of temperature, water vapor condenses into water, which is separated from hydrogen sulfide, causing corrosion to pipes and equipment. In addition, if the water in biogas condenses, it is easy to form pipe blockage in winter if the pipe insulation is not good, which will affect the normal operation of valves. In addition, from the perspective of environmental protection, sulfur dioxide produced by hydrogen sulfide extinguished with biogas will pollute the environment.
Physical, chemical and biological methods can be used to remove hydrogen sulfide from biogas. The physical desulfurization method is usually activated carbon method;
In chemical desulfurization method, iron oxide desulfurizer is commonly used in dry desulfurization, while in chemical desulfurization method, wet 888 desulfurization and complex iron desulfurization are commonly used in wet desulfurization; biological desulfurization mainly refers to biological desulfurization. The content of hydrogen sulfide in biogas and the required removal degree should be considered in the selection of detailed plan.
Biogas dehydration mainly includes gravity dehydration, low temperature condensation and deep dehydration, such as molecular sieve.
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