The Numerical Simulation And Optimization Research Of The Rotational Flow Sedimentation Tank Based On FLUENT

Rotational flow sedimentation tank, as a important method to purify waste water in metallurgy industry, is designed to separate ferric oxide particles from backward cooling water, and the particles are deposited at the bottom cut. In its application, serious ferric oxide particles sedimentation phenomenon could often been found at suction well. This phenomenon will result in serious damage to the pump body and frequent cleaning toward ferric oxide particles, and will produce troubles to production and management. So it's necessary to investigate this phenomenon deeply in the front stage. A new rotational flow sedimentation tank is set up by changing the structure in the tank and the inlet velocity, and the problem of ferric oxide particles sedimentation is solved completely. The new type tank is provided with higher separation function than the traditional rotational flow sedimentation tank.But a few message was found in the first stage: the simulation parameters affect the simulation veracity obviously, the structure of the rotational flow sedimentation tank isn't simplified by removing the suction well and fixing cone plank, the aperture of perforation plank and the inlet velocity also affect the deposition function of ferric oxide particles obviously. In this article, the simulation parameters and the structure parameters in the first stage will be taken further research. The content of the research are these aspects described as follows: optimization of the iteration number, sphericity coefficient, reflect coefficient, number of steps and length scale; the separation efficiency between fixing cone plank and removing cone plank are compared to decide whether removing the cone plank or not. the effect of deposition function in the case of changing aperture size and inlet velocity. In this article, turbulent flow model and dynamical particle dispersion model were used to set up the numerical fluid dynamical model of the rotational flow sedimentation tank. The preprocess module GAMBIT of software FLUENT was used to build the improved models, and those models are simulated by FLUENT. Then the flow field and separation efficiency curves of different models can be obtained respectively. Through the simulation of velocity field and ferric oxide particles distribution of rotational flow sedimentation tank, the rules of particle separation was understanded, and the conclusions are obtained as follows:...