Numerical Simulation Research On Gas-Solid Separation Device Of Dangerous Material Collecting Vehicle

With the rapid economic development of our country,energy,raw materials and other hazardous chemicals in circulation is growing and accident of transporting hazardous chemicals are usually occurred.Leakage of hazardous chemicals often causes casualties,environmental pollution and a series of social problems.However,there has been a certain treatment plan for large-area leakage of solid hazardous chemicals,and there is no effective solution for hazardous chemicals particles that escape into the air.Therefore,in order to improve the collection capacity of small hazardous chemicals particles in hazardous chemicals collection vehicle,Numerical simulation of gas-solid separation device-cyclone separator and structural optimization used by computational fluid dynamics software FLUENT to meet the treatment needs of hazardous chemicals leakage accidents.The main research contents of the thesis include:(1)The structure and working principle of the cyclone separator are analyzed and the equilibrium state of the particles in the flow field are analyzed.By comparing various calculation models,the Reynolds stress model(RSM)is used as the turbulence model,and the simulation results using QUICK difference format and PRESTO pressure interpolation format are the most suitable for the actual flow field distribution.In the particle numerical simulation method,the drag force of the particles plays an important role in the separation,so a random orbit model with phase-coupling is used.(2)In order to ensure the reliability of the numerical simulation results,the selection of the model is consistent with the Hoekstra experimental model size and operating conditions.The meshing software ICEM is used to mesh and use the FLUENT to numerically simulate the mesh model.In the gas flow field characteristics,the numerical simulation speed value is not much different from the experimental value.Based on this,the distribution of gas phase flow velocity and pressure is analyzed.(3)The gas-solid two-phase flow of the cyclone separator is simulated and analyzed.The stochastic orbit model of phase-coupling is used to obtain the trajectory of particle motion.The pressure loss and separation efficiency are obtained through calculation.The effects of operating conditions and structural parameters such as intake air velocity,exhaust pipe diameter and cylinder length on separation performance were analyzed,and the optimal values were selected for the influencing factors.The model of comprehensive optimal influencing factors was found by numerical simulation.The primary cyclone separator has a certain improvement in separation performance,but the effect is not significant,and further research work is needed.(4)After fully simulating and analyzing the cyclone separator,combining the characteristics of the cyclone separator and the bag separator,the idea of centrifugation and filtration is integrated,and a new cyclone filter separator is proposed,which explains its structure and working principle meshing.The porous medium model was added to the filter to simulate the gas phase and gas-solid phase.The velocity,pressure distribution and particle motion trajectory were obtained and analyzed.Compared with the traditional cyclone separator,the separation performance of the new separator is improved significantly,which can meet the leakage treatment requirements of dangerous particles,and provides ideas and references for the in-depth study of the cyclone separator.