肖茂栋,张卓,阮兵,李兴华.热扩散管的设计与性能测试[J].环境科学学报,2020,40(9):3204-3210
热扩散管的设计与性能测试
- Design and performance test of a thermal denuder
- 基金项目：国家重点研发计划（No.2017YFC0211404）；国家自然科学基金（No.41775121）
- 肖茂栋
- 北京航空航天大学空间与环境学院, 北京 100191
- 张卓
- 1. 北京航空航天大学空间与环境学院, 北京 100191;2. 中钢集团武汉安全环保研究院, 武汉 430081
- 阮兵
- 北京航空航天大学空间与环境学院, 北京 100191
- 李兴华
- 北京航空航天大学空间与环境学院, 北京 100191
- 摘要：为研究挥发性组分对气溶胶特性的影响，设计加工了一种热扩散管（Thermal Denuder，以下简称TD），由解析管和吸附管组成，调节温度范围为50~350℃；与文献中已有设计相比，本设计改进了测量TD管内部温度的位置，使得测温、控温更加准确；采用两段加热的方式使得温度分布更为稳定，延长有效停留时间.TD管性能测试表明：TD管内温度分布较均匀，可有效去除挥发性组分；当颗粒物的粒径大于60 nm时，颗粒物在不同温度的TD管内的传输效率变化很小，可近似看作是一个常数.
- Abstract：In order to study the effect of volatile components on aerosol characteristics, a thermal denuder (TD) was designed, which is composed of a denuder tube and an adsorption tube. The operation temperature of this TD ranges from 50℃ to 350℃. Compared with the existing designs in the literatures, the internal temperature measurement position in our design was optimized to improve the accuracy of temperature measurement and control. Furthermore, the two-stage heating method was adopted to improve the stability of internal temperature distribution, and elongate the effective residence time of particles within the analytical tube. The middle connecting flange of the adsorption tube is insulated by heating and glass wool respectively, which can effectively reduce the temperature drop at the outlet of the denuder tube. The TD performance test showed that temperature inside the TD tube is well-distributed and could effectively reduce the volatile components. The transport efficiency of particles larger than 60 nm inside the TD tube showed litte change at differential temperatures, which can be approximately regarded as a constant.
