焦炉烟气多污染物协同控制及资源化基础研究

According to the features of low SO2, high NOx, and the co-existence of both oxidative and reductive multi-pollutants, the synergistic treatment and resource utilization of coke oven flue gas will be comprehensively investigated over activated carbon by using a new process containing adsorption, catalytic conversion, thermal regeneration, and resource utilization. We propose that by coupling the active sites of activated carbon materials, the synergistic removal efficiency of NOx, SO2, H2S, HCN, CO and other pollutants can be improved; by designing a multifunctional catalyst, the de-NOx efficiency and the synergistic removal of HCN and CO can be significantly enhanced; by optimizing the thermal regeneration parameters, the desorption efficiency of sulfur containing components can be improved, various types of high-sulfur regeneration gases can be obtained, which can be further converted to (NH4)2SO4 and sulfonating agent; the concentration of CO in the regeneration gases can also be controlled, which enables its reuse in the coke oven combustion. The proposed research is extremely important for the high-efficient denitrification, pollutant control and resource utilization of coke oven flue gases, and the green development of coking industry.

针对焦炉烟气低硫高氮、氧化性气氛和还原性气氛中多污染物共存的特征，提出活性炭法吸附-催化-解析-资源化工艺，研究焦炉烟气多污染物协同控制与资源化利用技术。通过对活性炭材料活性位点的耦合调控，提高活性炭材料对NOx、SO2、H2S、HCN、CO等多污染物的协同脱除效能；通过对碳基担载活性组分的调控及优化，制备出可同时催化NOx的SCR反应和HCN的分解反应的新型活性炭担载多功能催化剂，强化NOx脱除效率并协同去除多种污染物(HCN、CO)；通过调控活性炭的解析过程工艺参数，促进含硫组分高效脱附，获得具有不同特征的富硫解析气，结合化产工艺制备出(NH4)2SO4和磺化煤泥，优化解析气中CO组分含量进而用于焦炉燃烧，实现含硫碳解析气的多途径高值化利用。本项目的研究成果对于实现焦炉烟气高效脱硝及多污染物协同控制、废物的资源化利用、并进一步推动焦化产业的绿色发展具有重要的科学意义。

针对焦炉烟气低硫高氮、氧化性气氛和还原性气氛中多污染物共存的特征，项目提出了活性炭法吸附-催化-解吸-资源化工艺，研发出焦炉烟气活性炭法多污染物协同控制技术，为焦炉烟气多污染物协同控制及资源化提供了理论支撑。探明了活性炭协同脱除焦炉烟气多污染物（SO2、NO、CO和H2S）的能效与机制，开发出以铜锰类水滑石为前驱体的混合金属氧化物双功能催化剂，同时催化氨法SCR脱硝和CO氧化反应，实现较低温度下NOx和CO的同时去除，并将其负载在活性炭上，制备出活性炭担载铜锰基催化剂，提高其实际应用潜力，为多污染物协同吸附-催化提供了理论依据。通过调控再生工艺参数，实现含硫组分高效解吸，探明了硫吸收后稀酸辅助污泥和煤泥水热碳化反应和磺化反应的机制，结合焦化生产工艺制备出硫酸铵和磺化煤泥，实现富集气体中含硫组分的多途径资源化利用。同时提出了在活性炭热解吸过程中采用CO还原NO的思路，可降低系统对还原剂NH3的消耗。系统分析了硫和碳元素在循环吸附-催化-解吸过程的迁移转化机制，重点解析了SO2和H2S污染物在整个处理工艺中的迁移转化历程，为硫的高效解吸利用及低碳耗再生提供科学依据。本项目的研究成果支撑了焦炉烟气活性炭法吸附-催化-解吸-资源化技术的应用，建成了示范工程1套，多污染物实现超低排放并制备出硫酸铵，自投运以来已稳定高效运行至今。该项目的实施对进一步推动焦化产业的绿色发展具有重要的科学意义。