Separation Performance Research On The Caisson Gas-Liquid Cylindrical Cyclone Separator

The caisson cylindrical cyclone separator is designed to be used in offshore oil field,and it can used for two-phase separator and three-phase separator.The thesis focuses on its function as two-phase separator.In this thesis,the separator is designed with the separation mechanism of inlet pipe downdip pre-separation,cylindrical cyclone main separation and horizontal caisson gravity auxiliary separation.And the distribution features of the separator main separation zone flow field and several structural parameters on the performance of separator are be analyzed deeply by means of multiphase cyclone separation theory,numerical simulation and experimental test.The main research contents and conclusions are as follows.Simulation studies of separator main separation zone show that the distribution of tangential velocity fits very well with the vortex structure of Rankin,the distribution of axial velocity is similar to the inverted ?V? type,and the total pressure is low in the center,but high on the edge of the separator.The pressure loss will decrease with the increase of the inclined angle of inlet pipe,the upper height of barrel,and the exhaust pipe diameter,but the tangential velocity and axial velocity will be decayed and the vortical intensity will decrease at the same time.The distribution of axial velocity will change into ?M? type form the inverted ?V? type and the stagnation will produce because of the increase of exhaust pipe diameter.The increase of cyclone diameter and the exhaust pipe insertion length will not only increase the pressure loss but also decrease the vortical intensity.The nonaxisymmetry caused by one-way entrance will make flow field instable,the instability shows that the center of rotation deviates the center of geometric centre of the bowl body.The instability will increase with the increase of the inclined angle of inlet pipe,and with the decrease of cyclone diameter and the exhaust pipe diameter.The exhaust pipe inserted into the separator will improve separator's instability of flow field.And the upper height of barrel has no obvious impact on the instability.The indoor prototype performance test research shows that the increase of gas and liquid flow will enhance vortical intensity,and cause liquid film adhere and climb along the inner wall of the separator.The main factor is the increase of gas flow,the shear drag produced by gas rotating along the wall will make liquid drop overcome its own gravity and shear resistance and climb with gas flow and change into liquid film.Inlet pipe downdip will be favorable for the formation of stratified flow in inlet pipe,and can reduce the flow swirl height above the entrance,reduce the Liquid Carry-over.The increase of the upper height of barrel can expend the high efficiency operating range of separator and improve the separation performance.The effect on high efficiency operating range caused by exhaust pipe insertion length is not as important as the effect caused by the upper height of barrel.