微米级雾滴协同液相吸收柴油机尾气中的VOCs

针对柴油机尾气中多组分混合的挥发性有机污染物 (VOCs) 开展净化去除研究，整体基于电声换能超声波雾化-超重力收集器联用技术，提出微米级雾滴协同液相吸收脱除柴油机尾气VOCs的应用方案。在对柴油机尾气VOCs排放特征定性与定量分析的基础上，选用不同种类的吸收剂、吸收浓度与分配比助剂，得到吸收剂的最佳使用条件。进而优化运行参数，获得最优工况条件。结果表明：在15%柠檬酸钠作为主吸收剂，0.22%柠檬酸与1%氯化钠作为助剂组成的最佳吸收剂与设定雾滴粒径为5 μm、雾化量为71 mL·min⁻¹，以及雾化后尾气停留1 s的最优运行条件下，本系统对柴油机尾气VOCs的综合吸收效率达到了58.5%。本研究可为移动源尾气VOCs的减排净化提供参考。

Absorption of VOCs from diesel exhaust in liquid phase in synergy with micron droplet

This study was aimed at the purification of multi-component mixed Volatile Organic Compounds (VOCs) from diesel engine exhausts. Based on the electroacoustic transducer ultrasonic atomization-supergravity collector coupling technology, a micron-scale droplet synergistic liquid-phase absorption for the removal of diesel exhaust VOCs was proposed. Firstly, the qualitative and quantitative analysis of the emission characteristics of VOCs from diesel engine exhaust was performed. Moreover, different types of absorbents, absorption concentrations and distribution ratio additives were studied to obtain the optimal conditions for absorbents. In addition, the main operating parameters of the experiment were evaluated to obtain the optimal working conditions. The results showed that the absorption efficiency of this new technology for diesel exhaust VOCs reached 58.5% under the operating conditions of 15% sodium citrate as the main absorber, 0.22% citric acid and 1% sodium chloride as additives, the droplet particle size of 5 μm, atomization volume of 71 mL·min−1 atomization volume and 1 s residence time after atomization, The results of the study can provide technical support for the reduction and purification of mobile source tailpipe VOCs.