插入式超声化学反应器的设计与仿真研究

Design and Simulation Study on Inserted Ultrasonic Chemical Reactor

超声辅助水样消解技术实现了水质多参数检测的快速性、准确性,而声化学反应器在超声消解法中起到了关键性作用。从理论方面分析了影响超声波在声化学反应器中能量传播的主要因素是反应器结构和几何尺寸;采用ANSYS软件仿真,设计了一种变幅杆插入式声化学反应器。通过MATLAB软件进行声场仿真分析,与槽式相比,插入式具有降低能量损耗,提高传播效率的优势。设计实验证明,基于插入式化学反应器的超声辅助快速检测方法测得标准邻苯二甲酸氢钾(KHP)溶液的化学需氧量(COD)值同国标法测得的COD值非常接近,准确度在-9.2%~4.4%,且测量重复性好,周期较短。该方法更有利于水质在线检测技术。

The rapidity and accuracy of water quality multi parameter detection had been realized by using the water sample digestion technology with the help of ultrasonic.The acoustic chemical reactor has played a key role in the ultrasonic digestion.The main factors that influence the energy propagation of ultrasonic wave are structure and geometry of the reactor from the theoretical analysis.A kind of reactor with inserting a solid horn is designed by using ANSYS software.The sound field simulation analysis of the proposed inserted chemical reactor has been carried out by using MATLAB software.The results show that the inserted chemical reactor has the advantages of reducing energy loss and improving propagation efficiency compared with the tank chemical reactor.The experimental results show that the chemical oxygen demand（COD）of standard potassium acid phthalate（KHP）solution that measured with rapid detection method based on the insertion type chemical reactor are very close to those measured with the national standard method.The inserted chemical reactor has an accuracy of-9.2%-4.4%,better measurement repeatability and shorter cycle.It is more suitable for water quality online detection.