煤焦燃烧特性与其脱硝效率间的关联实验研究  

Experimental investigation on the correlation between denitration efficiency and char combustion characteristics

作　　者：齐永锋 李正明 徐亮 张扬 张冬冬 王妹婷 

机构地区：[1]扬州大学水利与能源动力工程学院,江苏扬州225127

出　　处：《扬州大学学报（自然科学版）》2015年第1期53-56,共4页Journal of Yangzhou University：Natural Science Edition

基　　金：国家自然科学基金资助项目(51106133);江苏省科技支撑计划(社会发展)项目(BE2014682);江苏省自然科学基金资助项目(BK2010314);江苏省高校自然科学研究面上项目(10KJB470010;12KJB510032)

摘　　要：采用神木烟煤在高温氮气气氛下制备煤焦,并探讨了不同的氧气体积分数及取样位置下煤焦脱硝与燃烧间的关联.结果表明:煤焦脱硝效能的最大发挥主要可通过再燃区氧气体积分数的调控来实现.当再燃区氧气体积分数低于3.26%时,控制氧气体积浓度在煤焦表面实现表面氧化反应控制下的燃烧状态,能促进煤焦颗粒大幅升温,同时通过限制着火强度可以保证颗粒表面存在氧化反应生成活性点所需的足够氧气,此时适当延迟取样有利于煤焦脱硝效率的提高;当再燃区氧气体积分数高于3.26%时,易导致煤焦进入表面还原反应控制燃烧状态,过多延迟取样则将失去强化脱硝的效果.The experiments on correlation between char combustion characteristic and its denitration efficiency are carried out by using char prepared with Shenmu bituminous coal in high-temperature nitrogen. It is found that the char denitration can full bring into play by regulating oxygen in reburning zone. If the char combustion is controlled by surface oxidation reaction with oxygen volume fraction lower than 3.26 % and enough oxygen can reach char surface to generate active points by oxidation reaction with oxygen regulation, the char temperature will increase sharply and the denitration efficiency can also increase with delayed sampling. However, if the char combustion is controlled by surface reducing reaction under high oxygen atmosphere, i. e. oxygen volume fraction is higher than 3.26%, the delayed sampling has no significance for strengthening NOx reduction.

关 键 词：煤焦 脱硝 燃烧 表面氧化反应 表面还原反应 

分 类 号：TQ534[化学工程—煤化学工程] X701.7[环境科学与工程—环境工程]