在沼氣資源化利用中，為高純度甲烷氣的關鍵環節。變壓吸附與膜分離作為兩種主流提純技術，其耦合工藝通過優勢互補，能顯著提升提純效率與經濟性，為沼氣規模化應用提供了更優路徑。

　　In the resource utilization of biogas, it is a key link for high-purity methane gas. As two mainstream purification technologies, pressure swing adsorption and membrane separation can significantly improve purification efficiency and economy through complementary advantages in their coupling process, providing a better path for the large-scale application of biogas.

　　耦合工藝的核心邏輯在于分級處理與功能協同。沼氣經預處理去除硫化氫、水分等雜質后，先進入膜分離系統進行初步提純：利用特殊材質的膜對氣體的選擇性滲透特性，讓二氧化碳等小分子雜質優先透過膜層，甲烷則被截留，此時甲烷純度可提升至 90%-95%。這一環節能快速減少氣體體積，降低后續處理負荷。隨后，初步提純的沼氣進入變壓吸附系統，借助吸附劑（如活性炭、分子篩）對剩余雜質的選擇性吸附能力，在壓力周期性變化中進一步脫除殘留的二氧化碳、氮氣等，使甲烷純度最終達到 98% 以上。這種 “膜分離粗提 + 變壓吸附精提” 的組合，既發揮了膜分離處理量大、能耗低的優勢，又利用變壓吸附的高精度提純能力，彌補了單一工藝在純度或效率上的短板。

　　The core logic of coupling technology lies in hierarchical processing and functional collaboration. After pre-treatment to remove impurities such as hydrogen sulfide and moisture, biogas is first sent to a membrane separation system for preliminary purification: using the selective permeation characteristics of a special material membrane for gas, small molecule impurities such as carbon dioxide preferentially pass through the membrane layer, while methane is intercepted. At this time, the purity of methane can be increased to 90% -95%. This energy-saving process quickly reduces the volume of gas and lowers the subsequent processing load. Subsequently, the preliminarily purified biogas enters the pressure swing adsorption system, and with the selective adsorption ability of adsorbents (such as activated carbon and molecular sieves) for residual impurities, further removes residual carbon dioxide, nitrogen, etc. during periodic pressure changes, resulting in a methane purity of over 98%. This combination of "membrane separation crude extraction+pressure swing adsorption refined extraction" not only leverages the advantages of large membrane separation processing capacity and low energy consumption, but also utilizes the high-precision purification ability of pressure swing adsorption to compensate for the shortcomings of single processes in purity or efficiency.

　　反向耦合模式在特定場景中更具經濟性。對于甲烷濃度較低（低于 50%）的沼氣，可采用 “變壓吸附預處理 + 膜分離深度提純” 的流程：先通過變壓吸附在較高壓力下脫除大部分二氧化碳，提升沼氣中甲烷濃度至 70%-80%，再進入膜分離系統。此時膜分離面對的氣體組分更簡單，可減少膜的污染與損耗，延長使用壽命。這種模式尤其適合雜質成分復雜的沼氣，變壓吸附先去除易導致膜中毒的微量雜質，為膜分離創造穩定的進料條件，兩者形成 “防護 + 提純” 的協同關系。

　　The reverse coupling mode is more economical in specific scenarios. For biogas with low methane concentration (less than 50%), the process of "pressure swing adsorption pretreatment+membrane separation deep purification" can be used: first, most of the carbon dioxide is removed by pressure swing adsorption at a higher pressure to increase the methane concentration in biogas to 70% -80%, and then it enters the membrane separation system. At this point, membrane separation faces simpler gas components, which can reduce membrane fouling and loss, and extend the service life. This mode is particularly suitable for biogas with complex impurity components. Pressure swing adsorption first removes trace impurities that are prone to membrane poisoning, creating stable feed conditions for membrane separation. The two form a synergistic relationship of "protection+purification".

　　能耗控制與純度調節是耦合工藝的顯著優勢。單一膜分離若追求高純度，需多級串聯，能耗顯著上升；變壓吸附雖能達到高純度，但頻繁的壓力變化會增加能耗。耦合工藝通過合理分配兩級處理的負荷，可將單位甲烷能耗降低 15%-20%：膜分離承擔 70%-80% 的脫碳量，降低變壓吸附的壓力波動頻率；變壓吸附則聚焦于深度提純，避免膜分離為追求純度而過度消耗能量。同時，通過調整兩級工藝的操作參數（如膜組件的滲透壓力、變壓吸附的吸附時間），可靈活調節產品氣純度，既能滿足民用燃氣 95% 以上的純度要求，也能適配化工原料所需的 99.5% 超高純度，適配性遠超單一工藝。

　　Energy consumption control and purity regulation are significant advantages of coupled processes. If high purity is pursued for single membrane separation, multi-stage series connection is required, which significantly increases energy consumption; Although pressure swing adsorption can achieve high purity, frequent pressure changes will increase energy consumption. The coupling process can reduce unit methane energy consumption by 15% -20% by reasonably allocating the load of two-stage treatment. Membrane separation can bear 70% -80% of decarbonization and reduce the pressure fluctuation frequency of pressure swing adsorption; Pressure swing adsorption focuses on deep purification, avoiding excessive energy consumption for membrane separation in pursuit of purity. At the same time, by adjusting the operating parameters of the two-stage process (such as the permeation pressure of membrane components and the adsorption time of pressure swing adsorption), the purity of the product gas can be flexibly adjusted, which can meet the purity requirements of over 95% for civilian gas and also adapt to the 99.5% ultra-high purity required for chemical raw materials, far exceeding the adaptability of a single process.

　　實際應用中需兼顧工藝適配性與穩定性。在農業廢棄物沼氣工程中，耦合工藝可應對進料波動導致的沼氣組分變化：膜分離的快速響應能力能緩沖進氣濃度波動，變壓吸附則通過精準調控確保產品氣質量穩定。對于規模化沼氣項目，耦合系統的模塊化設計便于分期建設，可根據產氣規模逐步增加膜組件與吸附塔數量，降低初期投資壓力。此外，耦合工藝產生的富二氧化碳尾氣可被集中收集，用于溫室種植或化工合成，形成 “沼氣提純 — 高純度甲烷 — 二氧化碳利用” 的循環體系，提升整體資源利用率。

　　In practical applications, it is necessary to balance process adaptability and stability. In agricultural waste biogas engineering, coupled processes can cope with changes in biogas components caused by feed fluctuations: the rapid response capability of membrane separation can buffer fluctuations in inlet concentration, while pressure swing adsorption ensures stable product gas quality through precise regulation. For large-scale biogas projects, the modular design of the coupling system facilitates phased construction, and the number of membrane components and adsorption towers can be gradually increased according to the gas production scale to reduce initial investment pressure. In addition, the rich carbon dioxide tail gas generated by the coupling process can be collected centrally for greenhouse planting or chemical synthesis, forming a cycle system of "biogas purification high-purity methane carbon dioxide utilization", and improving the overall resource utilization efficiency.

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