沼氣作為一種可再生能源，廣泛應用于發電、供熱等領域，但其成分中的硫化氫（H?S）等有害氣體需經脫硫處理后才能安全使用。沼氣脫硫工藝通過一系列設備協同作用，高效去除硫化物，確保氣體品質與環保達標。

　　Biogas, as a renewable energy source, is widely used in power generation, heating and other fields. However, harmful gases such as hydrogen sulfide (H2S) in its composition need to be desulfurized before safe use. The biogas desulfurization process efficiently removes sulfides through a series of equipment synergy, ensuring gas quality and environmental standards.

　　預處理階段：氣源凈化與增壓

　　Pre processing stage: Gas source purification and pressurization

　　沼氣首先進入預處理系統，核心設備為增壓風機與過濾器。增壓風機通過調節閥門將沼氣壓力穩定在0.02至0.05兆帕，為后續脫硫反應提供穩定氣源。過濾器則采用多級濾芯，有效攔截沼氣中的粉塵、水分及大顆粒雜質，避免堵塞脫硫塔。例如，某沼氣工程通過安裝自動排水過濾器，將氣體含水量降低，顯著延長了脫硫劑使用壽命。

　　Biogas first enters the pre-treatment system, with the core equipment being the booster fan and filter. The booster fan stabilizes the biogas pressure at 0.02 to 0.05 megapascals by adjusting the valve, providing a stable gas source for subsequent desulfurization reactions. The filter adopts multi-stage filter elements to effectively intercept dust, moisture, and large particle impurities in biogas, avoiding blockage of the desulfurization tower. For example, a certain biogas project installed an automatic drainage filter to reduce the moisture content of the gas, significantly extending the service life of the desulfurizer.

　　脫硫核心：化學吸附與反應

　　Core of desulfurization: chemical adsorption and reaction

　　脫硫塔是脫硫工藝的核心設備，常見類型包括干法脫硫塔與濕法脫硫塔。干法脫硫塔內填充活性炭或氧化鐵脫硫劑，當沼氣通過時，硫化氫與脫硫劑發生化學反應，生成硫化物沉淀。濕法脫硫塔則采用堿性溶液吸收硫化氫，生成硫化鈉或硫氫化鈉。以氧化鐵脫硫劑為例，其反應方程式為：

　　The desulfurization tower is the core equipment of the desulfurization process, and common types include dry desulfurization tower and wet desulfurization tower. The dry desulfurization tower is filled with activated carbon or iron oxide desulfurizer. When biogas passes through, hydrogen sulfide reacts with the desulfurizer to form sulfide precipitation. Wet desulfurization tower uses alkaline solution to absorb hydrogen sulfide, generating sodium sulfide or sodium hydrosulfide. Taking iron oxide desulfurizer as an example, its reaction equation is:

Fe2?O3??H2?O+3H2?S→Fe2?S3??H2?O+3H2?O

　　脫硫塔需定期檢測進出口硫化氫濃度，當出口濃度超過50毫克/立方米時，需更換脫硫劑。

　　The desulfurization tower needs to regularly detect the concentration of hydrogen sulfide at the inlet and outlet. When the outlet concentration exceeds 50 milligrams per cubic meter, the desulfurizer needs to be replaced.

　　再生系統：脫硫劑活化與廢氣處理

　　Regeneration system: desulfurizer activation and exhaust gas treatment

　　脫硫劑飽和后需通過再生系統恢復活性。干法脫硫劑再生通常采用空氣氧化法，通過空氣壓縮機向塔內注入空氣，使硫化物氧化為單質硫：

　　After the desulfurizer is saturated, it needs to be restored to activity through a regeneration system. Dry desulfurization agent regeneration usually adopts air oxidation method, injecting air into the tower through an air compressor to oxidize sulfides into elemental sulfur:

 Fe2?S3??H2?O+1.5O2?→Fe2?O3??H2?O+3S

　　再生過程中產生的含硫廢氣需進入堿液吸收裝置，通過氫氧化鈉溶液噴淋吸收，確保排放達標。濕法脫硫系統則通過氧化塔將亞硫酸鹽氧化為硫酸鹽，實現溶液循環使用。

　　The sulfur-containing waste gas generated during the regeneration process needs to enter the alkali absorption device and be absorbed by spraying sodium hydroxide solution to ensure that the emissions meet the standards. The wet desulfurization system uses an oxidation tower to oxidize sulfite into sulfate, achieving solution recycling.

　　后處理與監測：品質保障與排放控制

　　Post processing and monitoring: quality assurance and emission control

　　脫硫后的沼氣需經過后處理系統進一步凈化。活性炭吸附裝置可去除殘留的硫化物與揮發性有機物，確保氣體純度。同時，在線監測系統實時檢測硫化氫濃度、壓力及溫度等參數，數據異常時自動報警并啟動應急程序。例如，某沼氣發電項目通過安裝紅外光譜分析儀，將硫化氫檢測精度提升至1ppm，保障了發電機組的安全運行。

　　The desulfurized biogas needs to be further purified through a post-treatment system. The activated carbon adsorption device can remove residual sulfides and volatile organic compounds, ensuring gas purity. At the same time, the online monitoring system detects real-time parameters such as hydrogen sulfide concentration, pressure, and temperature. When the data is abnormal, it automatically alarms and initiates emergency procedures. For example, a biogas power generation project improved the accuracy of hydrogen sulfide detection to 1ppm by installing an infrared spectrometer, ensuring the safe operation of the generator set.

　　輔助設備：系統穩定運行的基石

　　Auxiliary equipment: the cornerstone of stable system operation

　　沼氣脫硫工藝還需配備儲氣罐、循環泵、閥門管路等輔助設備。儲氣罐用于平衡氣源波動，循環泵則確保脫硫液均勻分布。閥門管路采用防腐材料，如304不銹鋼或玻璃鋼，以抵御硫化物的腐蝕。

　　The biogas desulfurization process also requires auxiliary equipment such as gas storage tanks, circulation pumps, valves and pipelines. The gas storage tank is used to balance the fluctuation of the gas source, while the circulation pump ensures the uniform distribution of the desulfurization solution. The valve pipeline adopts anti-corrosion materials such as 304 stainless steel or fiberglass to resist the corrosion of sulfides.

　　維護與管理：延長設備壽命的關鍵

　　Maintenance and Management: The Key to Extending Equipment Lifespan

　　為確保脫硫效率，設備需定期維護。例如，每月檢查脫硫劑裝填量，每季度清理再生系統廢渣，每年對脫硫塔進行內部檢查。此外，需建立脫硫劑更換記錄與設備運行日志，為工藝優化提供數據支持。

　　To ensure desulfurization efficiency, the equipment needs to be regularly maintained. For example, checking the loading amount of desulfurizer every month, cleaning the waste residue of the regeneration system every quarter, and conducting internal inspections of the desulfurization tower every year. In addition, it is necessary to establish records of desulfurizer replacement and equipment operation logs to provide data support for process optimization.

　　沼氣脫硫工藝通過預處理、脫硫、再生、后處理及輔助設備的協同作用，實現了硫化氫的高效去除。隨著環保標準的提升，未來脫硫設備將向智能化、集成化方向發展，為可再生能源的利用提供更可靠的保障。

　　The biogas desulfurization process achieves efficient removal of hydrogen sulfide through the synergistic effects of pretreatment, desulfurization, regeneration, post-treatment, and auxiliary equipment. With the improvement of environmental standards, desulfurization equipment will develop towards intelligence and integration in the future, providing more reliable guarantees for the utilization of renewable energy.

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