并行微反应器系统中阻塞故障诊断的研究

Study on Fault Diagnosis of Blockage in Parallel Microreactor System

并行微反应器系统是微化工在工业生产中得以应用的有效手段,并行系统中如果存在阻塞故障,将影响产品质量和产量。首先建立了一个并行微通道的计算流体动力学(Computational Fluid Dynamics, CFD)仿真模型,在确保每个微反应器流量一致性的前提下,针对单管全阻塞条件,利用温度检测模型,研究了最优传感器位置和传感器数量配置的优化问题。然后,以4通道并行微反应器为研究对象,对在模型中配置2~4个温度传感器分别进行研究,以在模型中进行等间距配置时的方案为优化初始解,最后求得最优的配置方案。通过在目标函数中定义的控制传感器个数控制函数,分析了配置不同个数传感器时优化目标的变化趋势,最后确定了传感器的最佳配置个数,以此来对系统中阻塞故障进行有效地诊断。

A multi-channel parallel microreactor system is a feasible approach of microchemical application in the industry field. However, the product quality and output of the reaction are greatly decreased due to the blockage faults. In this paper, a CFD(Computational Fluid Dynamics) model of multi-channel parallel microreactor is firstly established. A temperature detection model is used for the full blockage condition of a single tube, and the number and position of sensors are optimized by ensuring the consistency of the flow rate of each microreactor. Then, taking a 4-channel parallel microreactor system as an example, the optimal 2 to 4 sensors placement are studied separately. The optimization problem is solved based on the initial equidistant sensor positions. Moreover, the numbers of sensors are set to be optimal variables, and the change trend of the object is also developed. Finally, the goal of effectively diagnosing the blocking fault in the system is achieved through the optimal numbers of sensors.