Biogas is a product of anaerobic fermentation of biomass, and is a high-quality renewable biomass energy source. Its main component is CH4 (about 55% -70%) CO2 (about 30% -45%), as well as a small amount of H2S, O2, CO, N2, and other hydrocarbons. The CO2 in biogas reduces the energy density and calorific value of biogas, limiting its utilization range. Therefore, it is necessary to decarbonize and purify biogas to reduce its CO2 content.
沼氣提純的技術主要有以下及方面：
The technologies for purifying biogas mainly include the following aspects:
1. Membrane separation method is an energy-saving CO2 separation and recovery process that has developed rapidly in recent years. This method utilizes the different solubility and permeability of different components in biogas when passing through the membrane to achieve the separation of biogas.
2. Chemical absorption method uses weakly alkaline absorption liquid to absorb acidic CO2 in the adsorption tower, and then enters the desorption tower under high temperature conditions to complete regeneration, thereby achieving the purpose of removing CO2 from biogas.
3、水洗法是利用CO2和CH4在水中溶解度不同，通過物理吸收，實現CO2和CH4的分離目的。
3. The water washing method utilizes the different solubility of CO2 and CH4 in water to achieve the separation of CO2 and CH4 through physical absorption.
4. The adsorption principle of pressure swing adsorption method is to selectively adsorb CO2 from biogas by utilizing the different adsorption abilities of adsorbents for CH4 and CO2, in order to separate it from CH4.
5. The low-temperature separation method utilizes the different boiling points of CH4 and CO2 to convert CO2 in biogas into liquid or solid under low-temperature conditions, but CH4 remains in a gaseous state, thus achieving the separation of the two.
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2023-04-12
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