烟气净化用活性炭脱硫脱硝机理研究与发展趋势

Mechanism and development trend of desulfurization&denitrification of activated carbon used in flue gas purification

基于烟气净化用活性炭特性阐述其脱硫脱硝机制,列举了活性炭干法烟气净化技术的适用领域,将关键应用指标与实验室测试相结合。根据烟气净化用活性炭应用状况及运行成本分析,探讨烟气净化用活性炭生产技术的发展趋势。结果表明:活性炭干法烟气净化技术适用于烟气流量大、污染物成分复杂的矿石烧结、球团等烟气净化处理,装置占地小、流程短且可靠性高,适用于场地空间受限的焦化烟气处理升级改造工程,且运行成本较低。活性炭烟气净化技术的主要优势是在低温(<200℃)条件下仍具有SCR脱硝催化活性,但在超低排放标准实施的背景下,脱硝效率偏低为其主要劣势之一。在现有烟气净化用活性炭应用及运行状况下,降低烟气净化用活性炭生产成本是关键。选用含碳量高的固体废弃物作为原料,采用干式黏结剂成型、炭化-活化一体工艺是未来发展趋势。

Based on the characteristics of activated carbon for flue gas purification,the desulfurization and denitrification mechanism of activated carbon was described,and the application fields of activated carbon dry flue gas purification technology were listed,and the key application indexes were combined with laboratory tests.The development trend of activated carbon production technology for flue gas purification was discussed according to the application status and cost analysis of activated carbon for flue gas purification.The analysis shows that the activated carbon dry flue gas purification technology is suitable for the flue gas purification treatment of ore sintering and pellet with large flue gas and complex pollutant composition.The device covers a small area,the process is short and the reliability is high.It is also suitable for the upgrading projects of coking gas treatment with limited sites space,and the operation cost is low.The main advantage of activated carbon flue gas purification technology is that it still has SCR denitrification catalytic activity at low temperature(<200℃).However,the low denitrification efficiency becomes one of its main disadvantages in the context of the implementation of ultra-low emission standards.Under the existing application and operation of activated carbon for flue gas purification,it is key to reduce the production cost of activated carbon.Selecting some solid wastes with high carbon content as raw materials,using dry binder molding,carbonization-activation integrated process is the future development trend.