旋转填充床中湿法脱硝的研究  

Study of Wet Denitration in a Rotating Packed Bed

作　　者：高文雷 曾泽泉[1] 陈建铭[1] 陈建峰[1] 邵磊[1] 

机构地区：[1]北京化工大学教育部超重力工程研究中心有机无机复合材料国家重点实验室,北京100029

出　　处：《高校化学工程学报》2014年第5期1160-1165,共6页Journal of Chemical Engineering of Chinese Universities

基　　金：国家自然科学基金(21276013;20990221);教育部新世纪优秀人才支持计划(NCET-07-0053)

摘　　要：氮氧化物对环境和人体有很严重的伤害,随着法规对氮氧化物排放要求越来越严厉,脱硝问题越来越受到重视。今用臭氧预氧化模拟烟气中的氮氧化物,进而分别采用氢氧化钠和双氧水溶液作为吸收剂,在旋转填充床中进行氮氧化物的吸收研究,考察了操作条件及不同添加剂对脱硝率的影响。结果表明:脱硝率随着O3/NOx摩尔比、吸收剂浓度的增大而增大,随着气液比的增大而减小,而随着旋转床转速的增大,脱硝率先增大后减小。确定最优的工艺条件为O3/NOx摩尔比为0.6,吸收剂浓度为0.025 mol·L-1,旋转床转速为800 r·min-1,气液比为14:1,此时NaOH吸收剂的脱硝率可达到80%,H2O2吸收剂的脱硝率可达85%。在NaOH吸收剂中添加高锰酸钾、双氧水等氧化剂均能有效提高吸收过程的脱硝率。Nitrogen oxide （NOx） can significantly harm the environment and human body. With the enforcement of more stringent regulations, there is an urgent need to have a cost-effective denitration method. Simulated flue gas containing NOx （NO and air） was pre-oxidized by O3 and absorbed by NaOH or H2O2 solution in a rotating packed bed （RPB） in this study. The effects of different operation conditions and additives on denitration efficiency were investigated. It was found that denitration efficiency increases with increasing O3/NOx molar ratio, absorbent concentration and liquid/gas ratio, and increases at first and then decreases with increasing rotation speed. The optimum operation conditions were determined as O3/NOx molar ratio of 0.6, absorbent concentration of 0.025 mol·L-1, rotation speed of 800 r·min-1, and gas-liquid ratio of 14：1, and under above conditions, the denitration efficiency reaches 80% and 85% with NaOH and H2O2 as absorbents respectively. The addition of KMnO4 or H2O2 in NaOH absorbent has a positive effect on denitration.

关 键 词：臭氧氧化 湿法脱硝 旋转填充床 脱硝效率 

分 类 号：TQ051.19[化学工程] X701[环境科学与工程—环境工程]