吸收-低温等离子体-吸附耦合脱除沥青烟气的性能研究  

Performance of Asphalt Gas Removal by Absorption-Low-Temperature Plasma-Adsorption Coupling

作　　者：朱冰冰 陈海军[1] ZHU Bingbing;CHEN Haijun(School of Mechanical and Power Engineering,Nanjing Tech University,Nanjing Jiangsu 211816,China)

机构地区：[1]南京工业大学机械与动力工程学院,江苏南京211816

出　　处：《当代化工》2024年第5期1046-1051,1056,共7页Contemporary Chemical Industry

基　　金：国家重点研发计划项目,特色小镇全可再生能源多能互补热电气储耦合供能系统关键技术及示范(项目编号:2018YFB1502903)。

摘　　要：针对单一分离方法对沥青烟的脱除效果不佳的难题,提出了吸收-低温等离子体(DBD)-吸附耦合喷淋塔脱除方法。对DBD放电进行射流光谱分析;建立了实验装置,对某沥青烟气进行测试,分析各单元的脱除特性及关联,考察DBD放电电流及烟气量等条件对脱除性能的影响。结果表明:DBD放电区域内存在大量激发态的N_(2)分子和OH自由基,会与NO_(x)、SO_(2)和VOCs发生碰撞和反应,形成协同脱除效果。净化系统各单元的脱除效果由强到弱顺序为DBD、喷淋塔、活性炭箱;DBD在NO_(x)和SO_(2)的脱除过程中会产生副产物(NO_(2)、N_(2)O_(4)或SO_(3)等),且活性炭对其吸附量较小;对于VOCs,经过DBD后,产生的小分子等进一步被活性炭吸附脱除约19.56%。风量和DBD电流对VOCs的脱除率影响不大,但能明显调控对NO_(x)和SO_(2)脱除。系统对沥青烟气中的NO_(x)、SO_(2)和VOCs都有较好的处理效果,出口的尾气排放质量浓度均符合国家标准(GB16297—1996)所规定的污染物排放的浓度指标。A absorption-low temperature plasma(DBD)adsorption coupled spray tower removal method was proposed to address the problem of poor removal efficiency of asphalt smoke using a single separation method.The jet spectrum analysis of DBD discharge was carried out;An experimental device was established to test a certain asphalt flue gas,analyze the removal characteristics and correlations of each unit,and investigate the effects of DBD discharge current and flue gas volume on the removal performance.The results showed that there were a large number of excited state N_(2)molecules and OH radicals in the discharge region of DBD,which could collide and react with NO_(x),SO_(2)and VOCs,forming a synergistic removal effect.The removal efficiency of each unit of the purification system from strong to weak was as follows:DBD,spray tower,activated carbon box.DBD produced by-products(NO_(2),N_(2)O_(4)or SO_(3),etc.)during the removal of NO_(x)and SO_(2),and the adsorption capacity of activated carbon was relatively small.After DBD treatment,small molecules generated by VOCs were further adsorbed and removed by activated carbon by about 19.56%.The air volume and DBD current had little effect on the removal rate of VOCs,but could significantly regulate the removal of NO_(x)and SO_(2).The system had good treatment effect on NO_(x),SO_(2),and VOCs in asphalt flue gas,and the exhaust emission mass concentration at the outlet met the mass concentration indicators for pollutant emissions specified in the national standard(GB16297—1996).

关 键 词：低温等离子体(DBD) 光谱特性 沥青烟气 脱除率 排放指标 

分 类 号：TQ028[化学工程] TK411.5[动力工程及工程热物理—动力机械及工程]