沼氣作為可再生能源，在農村能源供應、廢棄物資源化利用等領域發揮關鍵作用。其成分中的硫化氫（H?S）卻暗藏風險，凸顯脫硫處理的緊迫性。從設備安全、環境保護到人體健康，脫硫環節構成沼氣利用不可或缺的技術屏障。

　　Biogas, as a renewable energy source, plays a crucial role in rural energy supply and waste resource utilization. The hydrogen sulfide (H? S) in its composition poses hidden risks, highlighting the urgency of desulfurization treatment. From equipment safety, environmental protection to human health, the desulfurization process constitutes an indispensable technical barrier for the utilization of biogas.

　　設備腐蝕的隱形威脅

　　Hidden threat of equipment corrosion

　　沼氣中的硫化氫濃度通常在1000-10000ppm之間，這種酸性氣體與金屬接觸后，會引發電化學腐蝕。以沼氣發電機組為例，氣缸、活塞環等關鍵部件在含硫環境中運行，腐蝕速率可達0.1mm/年，導致設備壽命縮短40%-60%。某沼氣工程實測數據顯示，未脫硫機組運行18個月后，氣缸內壁出現直徑5mm的腐蝕坑，維修成本激增至設備原值的25%。

　　The concentration of hydrogen sulfide in biogas is usually between 1000-10000ppm, and this acidic gas can cause electrochemical corrosion when in contact with metals. Taking biogas generator sets as an example, key components such as cylinders and piston rings can corrode up to 0.1mm/year in sulfur-containing environments, resulting in a 40% -60% reduction in equipment lifespan. According to the actual test data of a certain biogas project, after 18 months of operation of the desulfurization unit, a corrosion pit with a diameter of 5mm appeared on the inner wall of the cylinder, and the maintenance cost surged to 25% of the original value of the equipment.

　　大氣污染的源頭風險

　　Source risk of air pollution

　　硫化氫燃燒后生成二氧化硫（SO?），這是形成酸雨的主要前體物。據測算，1立方米沼氣完全燃燒可產生0.5克二氧化硫，若未經處理直接排放，相當于1輛柴油車行駛10公里的污染當量。在密閉空間如養殖場沼氣儲柜附近，硫化氫濃度可能突破100ppm安全閾值，引發操作人員急性中毒事件。

　　After the combustion of hydrogen sulfide, sulfur dioxide (SO ?) is generated, which is the main precursor for the formation of acid rain. According to calculations, complete combustion of 1 cubic meter of biogas can produce 0.5 grams of sulfur dioxide. If it is directly discharged without treatment, it is equivalent to the pollution equivalent of driving a diesel car for 10 kilometers. In enclosed spaces such as near biogas storage tanks in breeding farms, the concentration of hydrogen sulfide may exceed the safety threshold of 100ppm, causing acute poisoning incidents among operators.

　　工藝系統的效率掣肘

　　The efficiency constraints of the process system

　　硫化氫對沼氣凈化系統具有雙重破壞效應：一方面，其與脫硫劑反應生成硫磺，堵塞活性炭濾芯，使凈化效率以每月3%的速度衰減；另一方面，殘留硫化物在低溫環境下凝結，導致管道壓降增加15%-20%，迫使增壓風機能耗上升。某生物天然氣項目運行報告顯示，脫硫系統失效后，整體能源轉化效率下降8.7個百分點。

　　Hydrogen sulfide has a dual destructive effect on biogas purification systems: on the one hand, it reacts with desulfurizers to generate sulfur, which clogs the activated carbon filter and causes the purification efficiency to decay at a rate of 3% per month; On the other hand, residual sulfides condense in low-temperature environments, leading to a 15% -20% increase in pipeline pressure drop and forcing an increase in energy consumption of the booster fan. The operation report of a certain bio natural gas project shows that after the failure of the desulfurization system, the overall energy conversion efficiency decreased by 8.7 percentage points.

　　法規標準的剛性約束

　　Rigid constraints of regulatory standards

　　《大氣污染物綜合排放標準》明確規定，沼氣利用項目二氧化硫排放濃度不得超過550mg/m3。在京津冀、長三角等重點區域，地方標準進一步收緊至300mg/m3以下。環保督察案例表明，未配套脫硫設施的沼氣工程面臨停產整改風險，單次處罰金額可達項目總投資的5%-10%。

　　The Comprehensive Emission Standards for Air Pollutants stipulate that the concentration of sulfur dioxide emissions from biogas utilization projects shall not exceed 550mg/m 3. In key regions such as Beijing Tianjin Hebei and Yangtze River Delta, local standards have been further tightened to below 300mg/m 3. Environmental inspection cases have shown that biogas projects without supporting desulfurization facilities face the risk of shutdown and rectification, with a single penalty amount of up to 5% -10% of the total project investment.

　　技術經濟的平衡考量

　　Balancing considerations of technology and economy

　　當前主流干法脫硫技術可將硫化氫濃度降至50ppm以下，脫硫劑單耗控制在0.8kg/m?沼氣，年運行成本約占總收益的12%-15%。相較于設備提前報廢、環保處罰等潛在損失，脫硫投入具有顯著的經濟合理性。某萬噸級沼氣工程經濟性分析顯示，脫硫系統投資回收期僅2.3年。

　　The current mainstream dry desulfurization technology can reduce the concentration of hydrogen sulfide to below 50ppm, control the unit consumption of desulfurizer at 0.8kg/m3 biogas, and the annual operating cost accounts for about 12% -15% of the total revenue. Compared to potential losses such as early scrapping of equipment and environmental penalties, desulfurization investment has significant economic rationality. The economic analysis of a 10000 ton biogas project shows that the investment payback period for the desulfurization system is only 2.3 years.

　　健康安全的倫理底線

　　The ethical bottom line of health and safety

　　硫化氫具有神經毒性，空氣中濃度達700ppm可致人瞬間昏迷。在沼氣凈化車間、沼液儲存池等場景，未脫硫氣體泄漏可能引發群體性中毒事件。某地曾發生因沼氣脫硫裝置故障，導致3名工人硫化氫中毒的重大安全事故，教訓極為深刻。

　　Hydrogen sulfide has neurotoxicity, and a concentration of up to 700ppm in the air can cause instant coma. In scenarios such as biogas purification workshops and biogas slurry storage tanks, the leakage of desulfurized gas may lead to mass poisoning incidents. A major safety accident occurred in a certain place where three workers were poisoned by hydrogen sulfide due to a malfunction of the biogas desulfurization device, and the lessons learned were extremely profound.

　　沼氣脫硫不僅是技術規范要求，更是保障生產安全、履行環保責任的必然選擇。通過優化脫硫工藝參數、提升硫資源回收利用率，行業正探索出一條兼顧經濟性與可持續性的發展路徑，為循環經濟模式提供堅實支撐。

　　Biogas desulfurization is not only a technical specification requirement, but also an inevitable choice to ensure production safety and fulfill environmental protection responsibilities. By optimizing desulfurization process parameters and improving sulfur resource recovery and utilization, the industry is exploring a development path that balances economy and sustainability, providing solid support for the circular economy model.

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