| When the natural gas is produced from the wellhead,a certain amount of impurities such as carbon dioxide,hydrogen sulfide gas,water vapor and solid particles will be mixed in.In the process of transportation,water vapor is easy to form hydrate,liquid water and acid solution,resulting in blockage and corrosion of transportation pipelines,valves and other components,and increasing gas pressure loss.Therefore,natural gas dehydration is an important pre-treatment link of natural gas transportation and processing.As a new type of natural gas separator,supersonic swriling separator integrates the processes of droplet condensation,swriling separation and energy recovery,which can greatly reduce the unit area.the separator is environmentally friendly because it does not need to add chemical reagents.its investment and operation cost are low,which can effectively improve the shortcomings of traditional natural gas dehydration technology.All of these can effectively improve the shortcomings of traditional natural gas dehydration technology.However,the related theories of the separation technology at home and abroad are not perfect,and it is still in the development stage,which needs further study.In this paper,the structure characteristics of the existing supersonic swriling separator at home and abroad are sorted out,the structure of the front-mounted channel-type supersonic swriling separator is designed innovatively.First of all,MATLAB software is used to program and accurately calculate the profile curve of several supersonic swriling separator with different structural dimensions are designed on the basis of the structural characteristics of the swirl generator.Then through the Pro/E software to carry on the three-dimensional design to each part in the device,obtains the supersonic swriling separator geometry model.Finally,the flow field and the motion of droplets in the supersonic swriling separator were simulated by FLUENT software.According to the calculation results,the influence s of the structure parameters and operation parameters of the supersonic swriling separator on the separation efficiency of natural gas are analyzed,providing a theoretical basis for the engineering application.According to the numerical simulation results,the following conclusions can be obtained.(1)Natural gas can complete transonic transformation,achieve the low temperature environment required for droplet condensation,and generate enough rotational flow in the front-mounted channel-type supersonic swriling separator.This can make the impurities in natural gas be separated,which shows that the frontmounted channel-type supersonic swriling separator meets the design requirements.(2)The structural parameters of Laval nozzle and swirl generator have an important influence on the separation performance of the supersonic swriling separator,which is determined by the profile of the nozzle's shrinking section,the number of sw irl channels,the axial length of the swirl channel and the minimum flow size between the swirl channels.(3)Under the combined action of centrifugal force and inertia force,the droplets formed in the supersonic swriling separator mainly present three typical trajectories.With the increase of droplet diameter,the separation performance of the supersonic swriling separator decreases.(4)The increase of the pressure loss ratio at the inlet and outlet of the supersonic swriling separator,the increase of the temperature drop of the fluid are conducive to the condensation of the liquid drop,but not conducive to the separation of the liquid drop,and lead to the increase of the pressure loss of the fluid. |
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