The Numerical Simulation And Structure Optimization Of Multiphase UV- Fenton Reactor

This article mainly analyzes the different structure parameters of the reactor using Fluent. Gas holdup and liquid circulation velocity in an UV-Fenton reactor are investigated. The optimal structure parameter of the model is achieved, and the conclusions as follows:(1) Optimal structural parameters of axisymmetric reactor are obtained using Fluent. The results show that the distributions of liquid circulation velocity and gas holdup, which have been compared with the experimental results. The maximal relatively error between the results of experiment and simulation is less than 20%. Results can reflect the characteristics of liquid circulation in the reactor. Simultaneously, we conclude that axisymmetric reactor can be calculated by two-dimensional numerical simulation.(2) The gas holdup and liquid circulation velocity increase with the increasing of superficial gas velocity. According to the results, we can observe that the gas holdup increases with the increasing of ratio of Dr to D when the ratio is less than 0.75. But when the ratio gradually increases, there will be a large number of bubbles escape from the liquid surface. It will lead to the total gas holdup decreasing. The relationship between the gas holdup and liquid circulation velocity is well when the ratio of Dr to D is 0.75. Therefore, the ratio of Dr to D is set to 0.75.(3) With the increasing of superficial gas velocity and gap from the baffle to the bottom of the reactor, the gas holdup gradually increase. Liquid circulation velocity increases with the increasing of gap from the baffle to the bottom of the reactor and then decreases. Liquid circulation velocity reaches the maximal value when the gap from the baffle to the bottom of the reactor is120 mm,then we set it to 120 mm.(4) When the diameter of the bubbles are set to 0.1 mm, 0.5 mm, 1 mm, 1.5 mm, 2 mm and 2.5 mm, respectively. Gas holdup and liquid circulation velocity decrease with the increasing of the diameter of the bubbles. The influence on the gas holdup and liquid circulation velocity is less when the diameter of the bubbles increasing.(5) The liquid circulation velocity increases upon the increasing of ratio of height to diameter when the superficial gas velocity is constant.