在可再生能源利用領域，沼氣脫硫技術是保障系統安全運行與能源品質的關鍵環節。作為沼氣凈化處理的核心工序，脫硫工藝直接關系到沼氣的利用效率與環保合規性。本文將從技術本質出發，系統闡述沼氣脫硫的核心原理及其工程價值。

　　In the field of renewable energy utilization, biogas desulfurization technology is a key link to ensure the safe operation of the system and energy quality. As the core process of biogas purification treatment, desulfurization technology is directly related to the utilization efficiency and environmental compliance of biogas. This article will start from the essence of technology and systematically explain the core principles and engineering value of biogas desulfurization.

　　硫化氫的危害本質

　　The essence of the hazards of hydrogen sulfide

　　沼氣中的硫化氫是典型的腐蝕性氣體，其危害體現在三個維度：對金屬設備的電化學腐蝕速率可達普通環境的5倍；與水汽結合形成的酸性溶液會侵蝕管道內壁；燃燒后生成的二氧化硫是PM2.5的重要前體物。當沼氣中硫化氫濃度超過50ppm時，設備腐蝕風險呈指數級上升，必須通過脫硫工藝將其濃度控制在1ppm以下。

　　Hydrogen sulfide in biogas is a typical corrosive gas, and its hazards are reflected in three dimensions: the electrochemical corrosion rate of metal equipment can reach 5 times that of ordinary environments; The acidic solution formed by combining with water vapor will corrode the inner wall of the pipeline; The sulfur dioxide generated after combustion is an important precursor of PM2.5. When the concentration of hydrogen sulfide in biogas exceeds 50ppm, the risk of equipment corrosion increases exponentially, and its concentration must be controlled below 1ppm through desulfurization technology.

　　化學吸收法的技術邏輯

　　The technical logic of chemical absorption method

　　化學吸收法是當前主流的脫硫技術路線，其核心在于構建氣液傳質界面。沼氣以0.1-0.3m/s的線速度通過填料塔，與逆向流動的堿性吸收液充分接觸。吸收液中的氫氧化鈉或碳酸鈉與硫化氫發生中和反應，生成硫化鈉或硫氫化鈉。該反應的平衡常數達10^19量級，可確保硫化氫去除效率突破99%。吸收液再生系統通過蒸汽汽提或空氣氧化技術，使硫化物轉化為單質硫回收，形成閉環處理體系。

　　Chemical absorption method is currently the mainstream desulfurization technology route, and its core lies in constructing a gas-liquid mass transfer interface. Biogas passes through the packed tower at a linear velocity of 0.1-0.3m/s and comes into full contact with the alkaline absorbent flowing in the opposite direction. Sodium hydroxide or sodium carbonate in the absorption solution undergoes a neutralization reaction with hydrogen sulfide to produce sodium sulfide or sodium hydrosulfide. The equilibrium constant of this reaction is on the order of 10 ^ 19, ensuring a hydrogen sulfide removal efficiency of over 99%. The absorption liquid regeneration system uses steam stripping or air oxidation technology to convert sulfides into elemental sulfur for recovery, forming a closed-loop treatment system.

　　生物氧化法的創新突破

　　Innovative breakthrough in biological oxidation method

　　生物脫硫技術模擬自然界的硫循環過程，通過馴化培養的硫氧化細菌實現硫化氫的生物轉化。在生物濾池中，沼氣以0.05-0.1m/s的空床氣速通過填料層，硫化氫被微生物分泌的細胞色素氧化酶催化，轉化為單質硫沉積在生物膜表面。該技術的突破性在于將化學能轉化為生物能，運行能耗較化學法降低60%以上。關鍵控制參數包括：填料層濕度維持在50%-70%，pH值精確控制在7.5-8.5區間，溫度保持在25-35℃的最適生長范圍。

　　Biological desulfurization technology simulates the natural sulfur cycle process and achieves the biotransformation of hydrogen sulfide through domesticated sulfur oxidizing bacteria. In the biofilter, biogas passes through the packing layer at an empty bed gas velocity of 0.05-0.1m/s, and hydrogen sulfide is catalyzed by cytochrome oxidase secreted by microorganisms to be converted into elemental sulfur and deposited on the surface of the biofilm. The breakthrough of this technology lies in the conversion of chemical energy into bioenergy, which reduces operating energy consumption by more than 60% compared to chemical methods. The key control parameters include: maintaining the humidity of the packing layer at 50% -70%, accurately controlling the pH value within the range of 7.5-8.5, and maintaining the temperature within the optimal growth range of 25-35 ℃.

　　物理吸附法的工藝特性

　　Process characteristics of physical adsorption method

　　對于低濃度沼氣（硫化氫＜1000ppm），物理吸附法展現出獨特優勢。活性炭基吸附劑通過微孔結構產生的范德華力捕獲硫化氫分子，當吸附容量達到飽和后，可采用熱氮氣再生技術恢復吸附性能。新型金屬有機框架材料（MOFs）的應用使吸附容量提升3倍，穿透時間延長至48小時以上。該技術路線無二次污染產生，特別適用于分布式沼氣處理場景。

　　For low concentration biogas (hydrogen sulfide<1000ppm), physical adsorption method exhibits unique advantages. Activated carbon based adsorbents capture hydrogen sulfide molecules through van der Waals forces generated by their microporous structure. When the adsorption capacity reaches saturation, hot nitrogen regeneration technology can be used to restore the adsorption performance. The application of new metal organic framework materials (MOFs) has increased the adsorption capacity by three times and extended the penetration time to over 48 hours. This technology route generates no secondary pollution and is particularly suitable for distributed biogas treatment scenarios.

　　技術選型的工程考量

　　Engineering considerations for technology selection

　　脫硫工藝選擇需綜合評估三項要素：沼氣組分中硫化氫濃度波動范圍、后續利用方式對硫含量的要求、系統運行維護的便捷性。對于畜禽糞污沼氣等硫化氫濃度波動大的原料，推薦采用化學-生物聯合工藝；當沼氣用于燃氣發電時，需配置兩級脫硫系統確保硫含量≤10ppm；對于偏遠地區的小型沼氣工程，模塊化生物脫硫裝置可顯著降低全生命周期成本。

　　The selection of desulfurization process requires a comprehensive evaluation of three factors: the fluctuation range of hydrogen sulfide concentration in biogas components, the requirements for sulfur content in subsequent utilization methods, and the convenience of system operation and maintenance. For raw materials with large fluctuations in hydrogen sulfide concentration such as livestock manure, biogas, etc., it is recommended to use a chemical biological combined process; When biogas is used for gas-fired power generation, a two-stage desulfurization system should be configured to ensure that the sulfur content is ≤ 10ppm; For small-scale biogas projects in remote areas, modular biological desulfurization devices can significantly reduce the total lifecycle cost.

　　沼氣脫硫技術的本質是構建硫化氫的遷移轉化路徑，通過化學、生物、物理方法的協同作用，實現能源清潔化與設備耐久性的平衡。隨著環保標準的趨嚴和能源利用效率要求的提升，脫硫工藝正從末端治理向源頭控制演進，為沼氣產業的可持續發展提供關鍵技術支撐。

　　The essence of biogas desulfurization technology is to construct a migration and transformation pathway for hydrogen sulfide, achieving a balance between energy cleanliness and equipment durability through the synergistic effect of chemical, biological, and physical methods. With the tightening of environmental standards and the increasing demand for energy efficiency, desulfurization processes are evolving from end of pipe treatment to source control, providing key technical support for the sustainable development of the biogas industry.

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