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With the growing demand for renewable energy, biogas, as a combustible gas with a high calorific value, is attracting increasing attention. The purified biogas can meet various application requirements, including use as household gas, heat and electricity generation in thermal power plants, fuel for vehicles, and integration into natural gas pipelines. Lvyuan Environmental Protection utilizes PSA (Pressure Swing Adsorption) purification technology, which relies on pressure changes to enable adsorption and regeneration. This technology allows for the effective extraction of methane from biogas, raising its quality to meet natural gas standards, while also removing carbon dioxide, thereby facilitating the extraction and utilization of gaseous energy sources. The core advantages of PSA (Pressure Swing Adsorption) technology are operation at normal temperatures, a simple process flow, a high degree of automation, and the ability to achieve continuous separation and purification of gases. Today, I will introduce to you the working principle of this technology, its technical advantages, and its applications in various scenarios. I. Working principle of PSA purification technology: 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-liquid separator. From the bottom of the adsorption tower, it enters a methane decarburization purification unit with a pre-set control sequence. The components in the feed gas that are easily adsorbed (CO2) are captured by the adsorbent, while those that are not easily adsorbed (CH4) emerge as the product gas. This gas undergoes pressure regulation at the top of the adsorption tower and is further filtered through precision filters to remove any solid particles, before being sent to the pipeline network. The high-boiling-point impurity components remain adsorbed within 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 evacuation 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 equilibrium 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. II. Advantages of PSA purification technology: (1) High separation efficiency and high product purity; (2) Operation at normal temperature and pressure, resulting in low energy consumption and controllable operating costs; (3) Relatively simple equipment structure, facilitating operation and maintenance; (4) Ability to operate in a fully automatic, continuous manner; (5) Environmentally friendly, as it does not generate secondary pollutants such as wastewater. III. Multiple applications of PSA purification technology: (1) Production of vehicle-grade natural gas: The purified biomethane can be compressed into CNG or liquefied into LNG, to be used directly as fuel for vehicles, thereby replacing traditional natural gas and reducing carbon emissions in the transportation sector. (2) Integration into the natural gas network: When the purity of biogas meets **natural gas standards, it can be fed into the urban natural gas network to be used by residents and industrial users for heating, cooking, or manufacturing purposes, thereby enabling the recycling of energy. (3) Energy supply in the industrial sector: Purified biomethane can be used as fuel for industrial boilers and furnaces, or to power heating and power generation equipment in industrial processes. (4) Distributed energy systems: Near sources of biogas such as landfills and large-scale farms, biomethane can be produced using PSA purification technology. By pairing this with small gas turbines or generators, distributed power or heating systems can be established to meet the energy needs of surrounding industrial parks and communities, thereby reducing energy transmission losses. (5) Integration with environmental protection and solid waste treatment: This technology is often used in conjunction with biogas systems at landfills, livestock farms, and sewage treatment plants, converting the biogas that would otherwise be released directly into clean energy, thereby offering both environmental benefits and economic advantages. Lvyuan Environmental Protection looks forward to cooperating with you. In the future, the development of PSA biogas purification technology will focus more on improving efficiency and reducing costs, so as to make greater contributions to gas purification and environmental protection.