在工業生產與環保治理領域，脫硫技術的選擇直接關系到排放達標率與運營成本。當前主流脫硫技術可劃分為濕法、干法、半干法三大體系，各類技術原理、效率及適用場景存在顯著差異，需結合實際工況進行科學選型。

　　In the fields of industrial production and environmental governance, the choice of desulfurization technology is directly related to the emission compliance rate and operating costs. The current mainstream desulfurization technologies can be divided into three major systems: wet, dry, and semi dry. There are significant differences in the principles, efficiency, and applicable scenarios of each type of technology, and scientific selection should be based on actual working conditions.

　　濕法脫硫技術：效率與成本的平衡藝術

　　Wet flue gas desulfurization technology: the art of balancing efficiency and cost

　　濕法工藝以氣液反應為核心，典型代表為石灰石/石灰-石膏法。該技術通過吸收塔內漿液與煙氣的逆向接觸，實現二氧化硫的高效捕獲。其反應機理包含吸收、中和、氧化、結晶四步：二氧化硫溶解生成亞硫酸，隨后與鈣基吸收劑發生中和反應，經氧化形成石膏晶體。該工藝脫硫效率可達95%以上，尤其適用于高硫煤燃燒場景，且能同步去除煙氣中的粉塵。某燃煤電廠實際應用數據顯示，采用此工藝后二氧化硫排放濃度可穩定低于35mg/m3，滿足超低排放要求。

　　The wet process is centered around gas-liquid reactions, with the typical representative being the limestone/lime gypsum method. This technology achieves efficient capture of sulfur dioxide by reverse contact between the slurry and flue gas inside the absorption tower. The reaction mechanism includes four steps: absorption, neutralization, oxidation, and crystallization: sulfur dioxide dissolves to form sulfurous acid, which then undergoes neutralization reaction with calcium based absorbents and forms gypsum crystals through oxidation. This process has a desulfurization efficiency of over 95%, especially suitable for high sulfur coal combustion scenarios, and can simultaneously remove dust from flue gas. The actual application data of a coal-fired power plant shows that after adopting this process, the sulfur dioxide emission concentration can be stabilized below 35mg/m 3, meeting the ultra-low emission requirements.

　　濕法工藝的局限性同樣突出。設備腐蝕問題需通過內襯防腐材料解決，煙氣再熱系統則額外增加能耗。某石化企業改造案例顯示，濕法脫硫系統投資成本占環保總投入的60%以上，且年運行費用中電費占比達45%。對于中小型鍋爐，該技術可能面臨經濟性挑戰。

　　The limitations of wet process technology are also prominent. The problem of equipment corrosion needs to be solved by lining anti-corrosion materials, and the flue gas reheating system will incur additional energy consumption. A renovation case of a petrochemical enterprise shows that the investment cost of wet flue gas desulfurization system accounts for more than 60% of the total environmental protection investment, and electricity accounts for 45% of the annual operating costs. For small and medium-sized boilers, this technology may face economic challenges.

　　干法脫硫技術：簡捷與局限的博弈

　　Dry desulfurization technology: a game between simplicity and limitations

　　干法工藝以活性炭吸附法、電子束輻射法為代表。活性炭法通過催化氧化將二氧化硫轉化為硫酸，吸附劑可循環再生，副產物硫酸濃度可達80%以上。某鋼鐵企業實踐表明，該工藝脫硫效率穩定在90%左右，且無廢水排放，但初期設備投資較濕法高20%-30%。電子束法利用高能電子裂解煙氣成分，同步脫硫脫硝效率可達80%，但需配套輻射防護設施，運維技術門檻較高。

　　The dry process is represented by activated carbon adsorption method and electron beam radiation method. The activated carbon method converts sulfur dioxide into sulfuric acid through catalytic oxidation, and the adsorbent can be recycled and regenerated, with a by-product sulfuric acid concentration of over 80%. The practice of a certain steel enterprise has shown that the desulfurization efficiency of this process is stable at around 90%, and there is no wastewater discharge, but the initial equipment investment is 20% -30% higher than that of the wet process. The electron beam method utilizes high-energy electrons to crack the components of flue gas, achieving a synchronous desulfurization and denitrification efficiency of up to 80%. However, it requires supporting radiation protection facilities and has a high technical threshold for operation and maintenance.

　　干法工藝的短板在于反應速率。某垃圾焚燒廠對比測試顯示，相同工況下干法工藝脫硫效率較濕法低15-20個百分點，需通過增大吸收劑粒徑或延長反應時間補償。該技術更適用于排放要求不嚴、場地受限的中小型熱源。

　　The weakness of dry process lies in the reaction rate. A comparative test of a certain garbage incineration plant shows that under the same operating conditions, the desulfurization efficiency of the dry process is 15-20 percentage points lower than that of the wet process, which needs to be compensated by increasing the particle size of the absorbent or extending the reaction time. This technology is more suitable for small and medium-sized heat sources with less stringent emission requirements and limited space.

　　半干法脫硫技術：效率與經濟的雙贏路徑

　　Semi dry desulfurization technology: a win-win path for efficiency and economy

　　半干法工藝以循環流化床法最具代表性。該技術通過干態吸收劑多次循環，結合霧化增濕活化，實現氣固液三相高效反應。某供熱鍋爐改造項目數據顯示，在鈣硫比1.2條件下，脫硫效率可達92%，且系統阻力較濕法降低30%。其核心優勢在于：無廢水處理系統，投資成本較濕法低15%-25%；副產物為干態混合物，可直接用于建材原料。

　　The semi dry process is most representative of the circulating fluidized bed method. This technology achieves efficient gas solid liquid three-phase reaction through multiple cycles of dry absorbent combined with atomization humidification activation. Data from a heating boiler renovation project shows that under the condition of a calcium sulfur ratio of 1.2, the desulfurization efficiency can reach 92%, and the system resistance is reduced by 30% compared to wet methods. Its core advantage lies in: no wastewater treatment system, with investment costs 15% -25% lower than wet methods; The by-product is a dry mixture that can be directly used as building materials.

　　該工藝的突破性在于流程優化。通過布袋除塵器實現脫硫灰再循環，鈣利用率提升至95%以上。某化工園區集中供熱項目運行數據顯示，半干法工藝單位電耗僅為濕法的60%，且冬季運行無需煙氣再熱，綜合能效優勢顯著。

　　The breakthrough of this process lies in process optimization. By using a bag filter to achieve desulfurization ash recycling, the calcium utilization rate is increased to over 95%. The operation data of a centralized heating project in a chemical industrial park shows that the unit electricity consumption of the semi dry process is only 60% of that of the wet process, and there is no need for flue gas reheating during winter operation, demonstrating significant comprehensive energy efficiency advantages.

　　技術選型決策框架

　　Technology selection decision-making framework

　　排放標準導向：超低排放要求（SO?<35mg/m3）優先選濕法；一般排放標準（SO?<200mg/m3）可考慮半干法或干法。

　　Emission standard orientation: Wet method is preferred for ultra-low emission requirements (SO ?<35mg/m 3); The general emission standard (SO ?<200mg/m 3) can consider semi dry or dry methods.

　　規模經濟性：單機裝機容量>300MW推薦濕法；100-300MW區間半干法更具成本優勢；<100MW可評估干法。

　　Economies of scale: Wet method is recommended for single machine installed capacity>300MW; The semi dry method in the 100-300MW range has a cost advantage; <100MW can be evaluated for dry process.

　　資源化潛力：副產物有利用渠道時，氧化鎂法、氨法等資源化工藝可創造額外收益。某化肥企業采用氨法脫硫，副產硫酸銨年增收超千萬元。

　　Resource utilization potential: When by-products have utilization channels, resource-based processes such as magnesium oxide and ammonia can create additional revenue. A certain fertilizer enterprise adopts the ammonia method for desulfurization, and the annual income increase from by-product ammonium sulfate exceeds 10 million yuan.

　　場地約束：老廠改造項目宜選占地面積小的半干法或干法，新廠建設可優先布局濕法。

　　Site constraints: For the renovation project of an old factory, it is advisable to choose semi dry or dry methods with a small footprint, while for the construction of a new factory, wet methods can be prioritized.

　　新興技術展望

　　Outlook for Emerging Technologies

　　生物脫硫技術正逐步走向工業化。某污水處理廠試點項目顯示，利用硫氧化細菌可將硫化物轉化為單質硫，運行成本較傳統工藝降低40%。該技術雖效率尚待提升，但其環保屬性契合碳中和趨勢，未來可關注基因工程菌種開發進展。

　　Biological desulfurization technology is gradually moving towards industrialization. A pilot project of a sewage treatment plant showed that sulfur oxidizing bacteria can convert sulfides into elemental sulfur, reducing operating costs by 40% compared to traditional processes. Although the efficiency of this technology still needs to be improved, its environmental attributes are in line with the trend of carbon neutrality. In the future, attention can be paid to the development of genetically engineered bacterial strains.

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