Separation Performance And Optimum Design Study Of Exhaust Gas Separation Device In The Thorium Molten Salt Reactor

The exhaust gas treatment system is an important part of Thorium Molten Salt Reactor(TMSR).The gas-solid separator can improve the emission standard of exhaust gas and extract solid particles for reuse.As a key component of the system,the gas-solid separator directly determines the energy efficiency of the system.However,only filtration separation equipment is used in most nuclear power system,which results in large pressure drop and high maintenance cost.Based on the above considerations,the axial flow blade-filter combined separator is used in the nuclear power exhaust gas treatment system.The separation performance and its influencing factors are numerically simulated by CFD software fluent.On this basis,through structural optimization,a new cyclone louver-filter combined separator is proposed,and the efficiency of the new structure is further analyzed and verified.Major research work and conclusions are summarized as follows:Firstly,the hydrodynamic model of the axial flow blade-filter combined separator is established,and its numerical simulation is carried out by using CFD software fluent.The feasibility and accuracy of the numerical simulation method are verified by related literature.Secondly,based on the model and method,the numerical simulation of the gas-phase flow field and gas-solid two-phase flow field of the axial-flow blade-filter combined separator is carried out.The detailed flow field distribution and separation efficiency are obtained,and then the key structures are optimized.Thirdly,based on the limitations of existing structures,a new combined cyclone louver-filter separator is proposed,and the gas phase flow field and gas-solid two-phase flow field are simulated.Detailed flow field distribution,gas-solid separation efficiency and the cyclone louver-filter combined separation device with the best comprehensive performance are obtained.Based on the analysis of separation efficiency per unit pressure drop,the efficiency of the new cyclone louver-filter combined separator is verified and analyzed.