Design Analysis And Experimental Research Of Inline Gas-liquid Separator With Large Range Of Gas-liquid Ratio

In the field of oil and gas gathering and transportation,there are often occasions where gas liquid separation is needed.At present,the large horizontal or vertical three-phase separator was used to separate gas and liquid.When the gas and liquid ratio of the oil and gas field changes,the three-phase separator,designed according to the original parameters,is difficult to achieve the ideal separation effect.Therefore,a super compact inline separator is needed to be pretreated or a variety of inline separator combinations in the future to replace the low efficiency and large area of the tank separation equipment.Based on this,this paper studies the inline gas-liquid separator with compact structure and small area.The paper first investigates and summarizes the structure type,research status and engineering application of the pipe type gas liquid separator at home and abroad,introduces the basic theoretical knowledge that may be involved in the design process of the inline gas-liquid separator.Then based on the relevant research at home and abroad,the design theory and the theoretical model of the separation efficiency prediction are set up based on simplifying the distribution of the tangential velocity,and the preliminary structural design of the gas liquid separator in this paper is completed by detailed structural comparison and theoretical calculation.Next,combined with response surface methodology and CFD numerical simulation,the structural parameters affecting the separation efficiency and pressure drop of the inline gas-liquid separator are studied.The results show that the influence degree of vane angle,vane height,length of separation section and gas outlet diameter on the separation efficiency of inline gas-liquid separator is: vane angle > vane height > length of separation section > gas outlet diameter.And the first two structural parameters also have great influence on pressure drop.Based on this,the optimal structural parameter combination is obtained.It is that the vane angle is 60 degrees,the vane height is 10 mm,the length of the separation section is 350 mm,and the gas outlet diameter is 10 mm.Subsequently,the operational parameters affecting the separation performance of the inline gas-liquid separator were studied by numerical simulation.It is found that the inlet velocity,the turndown ratio,the particle size of the dispersed phase,the density difference and the continuous phase viscosity have important influence on the separation efficiency,and the specific relation curves are given.At last,the test and evaluation experimental system of inline gas-liquid separator was built,and the experimental study was carried out.In the design condition,the deliquid efficiency of the separator was above 99%,the gas outlet liquid content was far below the design requirement,the degassing efficiency was above 60%,and the gas content of the liquid outlet was high under individual working conditions;the pressure drop of the whole device is small,and the maximum pressure drop is 68.5kPa.