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    碱性吸收剂喷射脱除SO3研究进展

    Alkaline absorbents injection for SO3 removal: A comprehensive review

    • 摘要: 烟道中喷入碱性吸收剂可以显著减少SO3的排放,具有较强的适应性和较好的SO3脱除效果,受到了广泛关注。工业中常用于喷射脱除烟气中SO3的碱性吸收剂,包括钙基吸收剂、钠基吸收剂、镁基吸收剂等,其中钙基吸收剂成本较低,但SO3脱除效果较差;镁基吸收剂和钠基吸收剂的SO3脱除性能相对较好,但应用成本较高;还有如锌剂吸收剂、钾基吸收剂及飞灰赤泥吸收剂等被用于喷射脱除SO3。归纳探究了不同吸收剂的特性及在各种工艺条件下的应用效果对比,研究了SO3脱除机理和影响因素。通过比较不同碱性吸收剂的应用场景和性能,总结了工艺参数和吸收剂特性对SO3脱除效率的影响,分析了提升脱除SO3效率的方法。根据吸收剂喷射方式的不同,归纳其脱除SO3的反应机理。结果表明,通过工艺优化和吸收剂改性可以进一步提高碱基吸收剂对SO3的脱除效率,可为SO3喷射脱除控制新技术的设计和开发提供必要的参考和指导。

       

      Abstract: Abstract: Injection of alkaline absorbent into flue gas can significantly reduce SO3 emission, with strong adaptability and better SO3 removal effect, and has been widely emphasized. Alkaline absorbents commonly used in industry for injecting SO3 removal from flue gas include calcium-based absorbent, sodium-based absorbent, magnesium-based absorbent, etc., among which calcium-based absorbent has lower cost but poorer SO3 removal effect. Magnesium-based sorbent and sodium-based sorbent SO3 removal performance is relatively good, but the application cost is higher; there are such as zinc-based sorbent, potassium-based sorbent and fly ash red mud sorbent, etc. are used for jet removal of SO3. At present, many scholars have carried out a study to explore the characteristics of the different absorbents and the application of the advantages and disadvantages of a variety of process conditions, and to study the mechanism and influencing factors of SO3 removal. This paper compares the application scenarios and efficiencies of different alkaline absorbents, summarizes the effects of process parameters and absorber characteristics on SO3 removal efficiency, and summarizes the methods of each alkaline absorber to enhance SO3 removal efficiency. Depending on the absorber injection method, it is summarized the reaction mechanism for SO3 removal. It is found that the SO3 removal efficiency of alkaline absorbents can be further improved by process optimization and absorber modification, and the study can provide necessary reference and guidance for the design and development of new technologies for SO3 injection removal control.

       

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