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With the growing demand for renewable energy, biogas, as a combustible gas with a high calorific value, is receiving increasing attention. The purified biogas can meet various application requirements, including use as household gas, heat and electricity for thermal power plants, integration into natural gas pipelines, and use as vehicle fuel. Biogas purification refers to the process of removing impurities from biogas (mainly carbon dioxide) in order to increase the methane concentration, thereby improving energy efficiency and contributing to environmental protection. Tangshan Lvyuan Environmental Protection Technology Co., Ltd. employs the H-PSA carbon removal technology for biogas purification, which enables the effective extraction of methane from biogas to meet the quality standards required for natural gas, while also removing carbon dioxide, thereby facilitating the extraction and utilization of gaseous energy sources. So what is the working principle of PSA purification technology, and what are its advantages? Working principle of PSA purification technology: https://p3-sign.toutiaoimg.com/tos-cn-i-6w9my0ksvp/e07a2f67b29940fa893e3932b41a706b~tplv-tt-origin-web:gif.jpeg?_iz=58558&from=article.pc_detail&lk3s=953192f4&x-expires=1755327715&x-signature=UBUi%2B0iSlw%2FroyEZ%2BcY8opB2bhM%3D PSA purification technology is a gas separation method based on pressure changes. The gas coming from the desulfurization system is compressed by a compressor to 0.6 MPa; this biogas then enters a cold dryer to have its moisture removed. After that, it goes into a gas-water separator, and from there it enters a carbon removal and methane purification unit whose operation timing is preset. The components in the feed gas that are easily adsorbed by the adsorbent (such as CO2) are captured by the adsorbent, while those components that are not easily adsorbed (such as CH4) are released as the product gas. This gas undergoes pressure regulation and is passed through a precision filter to remove any solid particles before being sent to the pipeline network. High-boiling-point impurity components remain adsorbed in the adsorbent. The PSA purification technique uses pressure reduction or evacuation for desorption, that is, a portion is separated by reducing the pressure through pressure equalization. To ensure thorough regeneration of the adsorbent, after the pressure equalization process is complete, vacuum pumping is used to further reduce the partial pressure of impurities; once the vacuuming process is finished, the regeneration of the adsorbent is complete. After the adsorbent regeneration is completed, the pressure in the adsorption tower is -0.07 to -0.09. To ensure the adsorption efficiency and stabilize system pressure, it is necessary to pressurize the adsorption towers to reach the specified adsorption pressure; simultaneously with this pressure increase, the effective components (CH4) present in the dead spaces of other adsorption towers are recovered, and pressure balance is achieved between the towers in a pair-wise manner. Then, the product gas is used to raise the pressure in the adsorption tower to the adsorption pressure; at this point, the preparation for adsorption in the tower is complete, and the next cycle can begin. Through the above process, continuous, stable, and safe operation of the methane purification unit is achieved. https://p3-sign.toutiaoimg.com/tos-cn-i-6w9my0ksvp/f99c56006ec7476f95f69fd8ff4e7991~tplv-tt-origin-web:gif.jpeg?_iz=58558&from=article.pc_detail&lk3s=953192f4&x-expires=1755327715&x-signature=W1nLMoVfH96U1OI9emJY%2FMnqwec%3D Advantages of PSA purification technology: 1. High product purity, meeting automotive fuel standards ； 2. Operates at normal temperature and low pressure, resulting in low energy consumption; no additional heating is required for bed regeneration ； 3. The equipment structure is relatively simple, making operation and maintenance convenient ； 4. It can achieve fully automatic continuous operation ； 5. Environmentally friendly, as it does not generate secondary pollutants such as wastewater.