Biogas is a mixed gas produced by the fermentation of organic waste, mainly composed of methane and carbon dioxide. Biogas has extensive application value, which can be used as fuel, power generation, hot water supply, etc. However, biogas contains a large amount of impurities, such as hydrogen sulfide, ammonia, water vapor, etc., which can affect the effectiveness and safety of biogas use. Therefore, biogas purification is necessary.
There are many methods for purifying biogas, including adsorption, membrane separation, chemical absorption, etc. Among them, chemical absorption method is currently widely used. Chemical absorption method is the use of chemical reactions to absorb or convert impurities in biogas into other substances, thereby improving the purity of biogas.
The main principle of chemical absorption method is to use chemical reactions to absorb or convert impurities in biogas into other substances. Commonly used absorbents include ammonia water, alkaline solution, organic amine, etc. Among them, ammonia is one of the commonly used absorbents. Ammonia can react with carbon dioxide in biogas to generate ammonium bicarbonate, thereby removing carbon dioxide from biogas. At the same time, ammonia water can also react with hydrogen sulfide in biogas to generate ammonium sulfide, thereby removing hydrogen sulfide from biogas.
The advantages of chemical absorption method are simple operation, stable effect, and low cost. However, chemical absorption methods also have some drawbacks. Firstly, the selection and use of absorbents need to be cautious, otherwise it may cause pollution to the environment. Secondly, the regeneration and recovery of absorbents also require certain technical and equipment support.
In short, biogas purification is necessary to improve the effectiveness and safety of biogas use. Chemical absorption method is currently a widely used method with the advantages of simple operation, stable effect, and low cost. However, the selection and use of absorbents require caution, and the regeneration and recovery of absorbents also require certain technical and equipment support.
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