The first step in biogas purification is pretreatment. This step mainly involves removing large particulate impurities such as suspended solids and sediment from biogas. The usual method is to filter through sedimentation tanks or filters to separate large particulate impurities.
Next is the removal of hydrogen sulfide. Hydrogen sulfide in biogas is a harmful gas that can cause corrosion to the environment and equipment. The commonly used methods for removing hydrogen sulfide include chemical absorption and biological absorption. Chemical absorption method is the use of chemical absorbents to react with hydrogen sulfide and convert it into harmless substances. The biological absorption law utilizes specific microorganisms to convert hydrogen sulfide into sulfate.
It is the removal of carbon dioxide. The high content of carbon dioxide in biogas can reduce its calorific value. The commonly used methods for removing carbon dioxide include adsorption and membrane separation. The adsorption method uses an adsorbent to adsorb carbon dioxide and separate it. The membrane separation method utilizes special membrane materials to separate carbon dioxide from biogas through permeation and diffusion.
The first step is the purification of methane. Methane is the most important and valuable component of biogas. The purification of methane is mainly carried out through methods such as liquefaction and compression. Liquefaction is the process of cooling biogas to a low temperature, converting methane into liquid form, and then separating the liquid methane through a separator. Compression refers to compressing biogas to a certain pressure to increase methane concentration, and then separating methane through a separator.
In summary, the process of biogas purification includes pretreatment, hydrogen sulfide removal, carbon dioxide removal, and methane purification. Each step has different methods and techniques to choose from, and the specific process and equipment configuration will vary according to the actual situation. By purifying biogas, the purity and utilization value of biogas can be improved, environmental pollution can be reduced, and sustainable energy utilization can be achieved.
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