稀土尾矿催化半焦脱硝性能研究  

Catalytic Performance of Rare Earth Tailings for Denitration of Semi-coke

作　　者：戚瑞 龚志军[1,4] 侯丽敏 武文斐 QI Rui;GONG Zhijun;HOU Limin;WU Wenfei(School of Energy and Environment,Inner Mongolia University of Science and Technology,014010 Baotou,China;Key Laboratory of Efficient and Clean Combustion,014010 Baotou,China;Key Laboratory of Integrated Exploitation of Bayan Obo Multi-metal Resources,014010 Baotou,China;Autonomous Regional Engineering Technology Research Center of Sustainable Exploitation of Rare Earth Secondary Resources,014010 Baotou,China)

机构地区：[1]内蒙古科技大学能源与环境学院,内蒙古包头014010 [2]内蒙古自治区高效洁净燃烧重点实验室,内蒙古包头014010 [3]内蒙古自治区白云鄂博矿多金属资源综合利用重点实验室,内蒙古包头014010 [4]内蒙古自治区稀土二次资源可持续利用工程技术研究中心,内蒙古包头014010

出　　处：《煤炭转化》2021年第3期68-75,共8页Coal Conversion

基　　金：内蒙古自然科学基金资助项目(2019ZD13,2020MS05045).

摘　　要：利用固定床反应器对白云鄂博稀土尾矿催化半焦的脱硝性能进行研究,分析了稀土尾矿不同添加量(1%(质量分数,下同),2%和5%)和球磨时间(10 min,30 min和60 min)对半焦燃烧时脱硝率的影响。结果表明:在白云鄂博稀土尾矿添加剂作用下半焦燃烧过程中NO生成量减少,并且在添加量为5%和球磨60 min时NO生成量最少;在稀土尾矿催化剂作用下半焦的NO生成量减少,结合半焦燃烧时的耗氧量以及白云鄂博稀土尾矿对CO还原NO的实验结果,NO生成量减少的原因为,添加白云鄂博稀土尾矿添加剂后强化了CO还原NO的作用,提高了半焦燃烧过程中氮氧化物的脱除效率。A fixed-bed reactor was used to study the performance of Bayan Obo rare earth tailings for catalyzing the semi-coke denitration.The effects of different addition amounts of the rare earth tailings(corresponding to 1%(mass fraction,the same below),2%and 5%)and the ball milling duration(10 min,30 min and 60 min)on the denitration rate of the semi-coke combustion were analyzed.The results show that under the Bayan Obo rare earth tailings additives,the amount of the NO produced during the combustion process of the semi-coke is reduced,and when the additive amount is 5%and the ball milling lasts 60 min,the NO production is the least.Under the action of rare earth tailings catalyst,the NO production of semi-coke is reduced.Based on the oxygen consumption during the combustion of the semi-coke and the experimental results of the NO reduced by CO from the Bayan Obo rare earth tailings,the mechanisms for the reduction in the NO production during the semi-coke combustion are analyzed.The results show that the addition of Bayan Obo rare earth tailings additives strengthens the effects of CO in terms of the NO production,which improves the removal efficiency of the nitrogen oxides during the combustion of the semi-coke.

关 键 词：稀土尾矿 催化脱硝 添加量 球磨时间 CO还原NO 

分 类 号：TQ534[化学工程—煤化学工程]