Biogas is a kind of mixed gas. Its composition not only depends on the type and relative content of fermentation raw materials, but also changes with different fermentation conditions and fermentation stages. When the biogas anaerobic reactor is in the normal and stable fermentation stage, the volume composition of biogas is roughly: methane (CH4) 50% ～ 75%, carbon dioxide (CO2) 25% ～ 45%, water (H2O, 20 ～ 40 ℃) 2% ～ 7%, nitrogen (N2) 0 ～ 2%, a small amount of oxygen (O2), and less than 1% hydrogen (H2) and hydrogen sulfide (H2S).
Compared with other combustible gases, biogas purification process is characterized by good explosion resistance and clean combustion products. At present, biogas is mainly used in power generation, heat supply and cooking. The CO2 in the biogas reduces the energy density and calorific value of the biogas, and limits the utilization range of the biogas. It is necessary to remove CO2, H2S and water vapor from the biogas to purify the biogas into biological natural gas (BNG). Biological natural gas can be compressed and used in such fields as vehicle fuel (CNG), cogeneration (CHP), incorporation into natural gas pipeline network, fuel cell and chemical raw materials. The use of bio natural gas in automobiles can not only reduce the air pollution caused by exhaust emissions, but also reduce the net greenhouse gas emissions by 75%~200%. Bio natural gas can be mixed into the existing natural gas pipeline network, reducing the dependence on petrochemical energy.
At present, the purification processes of landfill gas include pressure swing adsorption (PSA), water washing, chemical absorption, membrane separation, selective separation, etc. At present, the more mature and widely used methods in the world are pressure swing adsorption (PSA), chemical absorption (amine purification), and membrane separation.
The above is a detailed introduction to biogas purification, and we hope it will be helpful to you. If you have any questions, please contact us. We will provide services for you with our attitude http://www.sxyxzj.com
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