Flow Field Simulation And Structure Optimization Of A Small Supersonic Gas-liquid Separator

Dehydration of natural gas is a very important point in natural gas processing.Only when the moisture content in natural gas is controlled within a reasonable range,can the gas have a high calorific value and a safe pipeline transportation environment.Supersonic gas-liquid separator is a kind of low-temperature separation device applied to natural gas dehydration.It combines the processes of adiabatic expansion,low-temperature condensation,swirl separation,pressure expansion and deceleration.The device has no pollution,low energy loss and low cost.However,the domestic research is not perfect,still in the stage of laboratory test and numerical simulation.This paper studies the working principle of Supersonic Separator,compares the advantages and disadvantages of many kinds of cyclone design,optimizes the structure of the key components of the separator studied in the early stage,models and assembles the components of the separator with Solidworks software,and simulates the internal flow field of the separator with computational fluid dynamics(CFD)software FLUENT 15.0 The pressure field,velocity field and temperature field are analyzed in detail.In terms of operation parameters,11 groups of control simulation and analysis were carried out respectively on the three aspects of inlet pressure,outlet back pressure and ambient temperature.Because the diameter of the swirl section is small,it is impossible to install the swirl wings and blades.In order to reduce the impact of shock waves,the innovative design of the swirl section was carried out in the form of a double line,and the double line was carried out Nine groups of simulation comparison and optimization of structural parameters were carried out for the specific parameters,and the optimal swirl model was determined,which provided guidance for the processing and laboratory test of the small separator in the later stage.