Numerical Simulation And Optimization On Multiphase Flow Field In The Spraying Foam Tower

Along with the progress of the technology, the study on the character and movement rule of fluid is going deeper. But the fluid motion is so complicated, for not only in practical projects but also in complex shape section of multiphase flow, that physical model experiment and maintain test methods have some limitation in practical use to test properties of multiphase flow, however numerical simulation can show the specific information of the flow field. CFD method was a strong means to simulate the flow field, which can conveniently obtain the whole field results. It was characterized by its fast calculation, precision, easy implementation and perfect practice.Spraying foam experiment device had been already patented, which was designed according to the actual tower operation principle. The co-existence of momentum transformation and mass transmission of gas, liquid and solid always existed during three-phase dusting. Which made the fact that research on tree-phase flow was at starting stage both at home and abroad. Therefore, the appropriate mathematical calculation method should be firstly searched before numerical value analog computation and the design analyzing for actual tower:firstly, numerical simulations for experimental tower was carried out, verifying the feasibility and validity of the method; secondly, numerical simulation for the actual tower was implemented on the basis of the same mathematical method of experimental tower to design and optimize for the reference to other engineering projects.When the numerical simulation was used for experimental tower, different numerical methods were adopted for different parts'multiphase flow of the device. The Reynolds stress model(RSM) was first used for single phase flow, obtaining the export velocity distribution with measured results which could verify the feasibility of the calculation method; Euler-DPM-DPM method was chose to calculate the three-phase flow for enter part of the tower, while Euler-Euler-DPM method was for grille part; finally, the experimental research and the feasibility and validity of the numerical method were carried out on the pressure difference between inlet and outlet by altering system conditions and controller characters.The single phase flow and gas-liquid two phase flow of practical tower were calculated using the method as the same as the method adopted in experimental device.According to the mathematical flow field, discussed the running influence elements on purification, cooling and device resistance when parameters of desulfurization and dusting changed in order to provide references for the work in the future.On the basis of the gas-liquid-solid three phase flow of actual tower simulated by using the same method with the experimental device, the orthogonal experiment method was selected to study the operational parameters and structural parameters affecting the efficiency and tower resistance, which was to explore the best operation parameters settings scheme and best structure design scheme. In addition, design combination to improve the system running and dust removal efficiency was put forward, providing the powerful theory basis for later organization optimized design.