| The filter separator is an important equipment in the natural gas purification process.Its main principle of work is to absorb and block impurities such as solid particles in natural gas by using the internal multi-layer filter structure.Due to the uneven distribution of gas flow field in the filter separator and the inconsistent thickness of solid impurities adsorbed on the surface of the filter element,the local position of the filter element is seriously blocked,which affects the normal dust removal and the service life of the filter element.Current industrial technology is difficult to directly monitor internal flow field of the filter separator,aiming at this problem,this paper,taking a type filter separator gas transmission station as the research object,through the use of fluid dynamic software ANSYS Fluent software to simulate 15.0 filter separator internal flow field,and the solid particles in the flow field of sports,for filter separator site operation and provides the theory basis for structure optimization.Firstly,based on the continuity equation and Navistokes equation,using the Realizable k-ε model and the finite volume method,the velocity field,pressure field and airflow trace line in the filter separator re simulated numerically,and the gas-phase flow law in the separator is defined.The simulation results show that the distribution of the flow field in the filter separator is related to the operating pressure and the air volume,which mainly affects the inlet and outlet pressure difference and the local maximum air velocity.With the same capacity,the pressure difference between the two ends of the separator decreases slightly with the increase of operating pressure.Under each working condition,the velocity field distribution in the separator is basically the same,that is,except for the local high-speed zone,the velocity at the inlet and outlet of the separator is the maximum.Secondly,the discrete phase model is used to simulate and analyze the movement of particles in the separator and the trajectories of particles with different particle sizes.Solid particles will move along with the flow of gas.The simulation results of particles with different particle sizes show that the residence time of solid particles with different diameters in the flow field is different,and the residence time of particles decreases with the increase of particle diameter.Thirdly,it can be seen from the flow field distribution and section streamline that the flow field distribution in the original filter separator presents an uneven phenomenon,and the gas flow rate in the filter element at different space positions is quite different.There are large eddies in many places in the flow field,which cause irregular movement of the airflow.The dust particles at the bottom of the airflow coil are kicked up,which affects the filtration of the dusty airflow and the deposition of the filtered dust in the separator.Finally,the flow distribution parameters are introduced to analyze the flow distribution uniformity of the filter separator in detail.Non-uniformity of the original filter separator internal flow field to filter traffic distribution coefficient difference is bigger,uneven filter maximum flow amplitude of 1.28,comprehensive traffic nonuniform amplitude is 0.256,compared several different filter configuration the change of flow distribution parameters,three kinds of schemes for the gas phase flow field uniformity are optimized,have some comprehensive flow nonuniformity coefficient,for example,three schemes were compared with the original plan was reduced by 7.8%,38.3% and 30.9%. |
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