气液交叉流脱除亚微米级颗粒物的研究

发布时间：2017-12-30 19:43

本文关键词：气液交叉流脱除亚微米级颗粒物的研究　出处：《高校化学工程学报》2017年04期 　论文类型：期刊论文

【摘要】：亚微米级颗粒是化学工业尾气排放物的重要组成,其脱除效率是影响排放指标进一步提高的关键。基于颗粒捕获机理,建立了气液交叉流系统脱除效率的理论模型,并对该系统脱除亚微米级颗粒的特性进行了理论分析和实验研究。实验结果表明,低气速、高液柱群比表面积、高气液相温差有利于提升系统的脱除效率。粒径0.05~0.6μm,脱除效率随粒径的增大呈现先降低后增加的趋势,与理论值趋势一致,表明系统中同时存在惯性碰撞、拦截、布朗运动等三种脱除机理。相对于理论值,实验脱除率整体偏大,表明颗粒在高湿环境中易凝并,有助于颗粒在碰撞和拦截作用下的脱除。由实验数据外推,研究条件下,液柱单元排数为1300时,亚微米级颗粒质量脱除效率预计可达90%。
[Abstract]:Submicron particles are important components of tail gas emissions from chemical industry. The removal efficiency of submicron particles is the key to the further improvement of emission index based on particle capture mechanism. The theoretical model of the removal efficiency of gas-liquid cross flow system is established, and the characteristics of the system for removing submicron particles are theoretically analyzed and experimentally studied. The experimental results show that the specific surface area of the high liquid column group is high with low gas velocity. The high temperature difference of gas-liquid phase is beneficial to the removal efficiency of the system, and the removal efficiency decreases first and then increases with the increase of the particle size, which is consistent with the theoretical value. The results show that there are three removal mechanisms in the system: inertial collision, interception and Brownian motion. Compared with the theoretical values, the experimental removal rate is relatively large, which indicates that particles are easily condensed in high humidity environment. From the experimental data extrapolated from the experimental data the mass removal efficiency of submicron particles is estimated to reach 90 when the number of liquid column units is 1300.
【作者单位】：四川大学化学工程学院;维也纳技术大学化学工程研究所;
【基金】：国家国际科技合作专项资助(2014DFG92250)
【分类号】：X701
【正文快照】： 2.维也纳技术大学化学工程研究所,奥地利维也纳1060)随着城市空气质量问题愈演愈烈,有关颗粒物排放的国家标准越发严格。例如,《硫酸工业污染物排放标准》中规定现有企业颗粒物排放限制值为30 mg·m-3,容易发生环境污染特殊区域颗粒物排放限值为5 mg·m-3[1]。据统计[2],我国

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