沉箱式柱狀旋流氣液分離器的分離性能研究
[Abstract]:The caisson type cylindrical cyclone separator is a kind of separator which is to be used on the sea floor and has the function of two-phase and three-phase separation. In this paper, the function of two-phase separation is mainly studied. The separator is designed by the separation mechanism of inlet tube downdip preseparation, columnar swirl main separation and horizontal caisson gravity assisted separation. Under the guidance of multi-phase swirl separation theory and by means of numerical simulation and experimental test, the characteristics of flow field distribution and structural factors in the main separation zone of the separator are analyzed in depth. The main research contents and conclusions are as follows: the simulation of the main separation zone of the separator shows that the tangential velocity presents the characteristics of Lanjin combined vortex structure, the axial velocity presents the "inverted V" type distribution, the total pressure distribution is low in the center and the wall surface is high; In the range of simulated dimensions of each structural parameter, increasing the downdip angle of the inlet tube, the height of the upper cylinder, and the diameter of the exhaust pipe will reduce the pressure loss of the separator, but at the same time, it will cause the attenuation of tangential and axial velocity and decrease the swirl intensity. Moreover, increasing the diameter of exhaust pipe will change the axial velocity from "inverted V" to "M", resulting in stagflation. The increase of cylinder diameter and exhaust pipe insertion length will not only increase the pressure loss, but also cause the decrease of swirl intensity. The non-axisymmetric property of the unidirectional inlet of the separator makes the flow field of the separation cylinder unsteady and the rotating center deviates from the geometric center of the separation cylinder. The results show that increasing the downdip angle of the inlet tube and decreasing the diameter of the cylinder and the exhaust pipe will enhance the unstable characteristics of the internal flow field of the separator in the range of the simulated size of the structural parameters. The flow field instability of the separator can be improved by inserting the exhaust pipe into the separator, but the instability of the flow field is not obviously affected by the change of the height of the upper part of the cylinder. The performance test of the indoor prototype of the caisson type cylindrical cyclone separator shows that the increase of the flow rate of gas and liquid increases the intensity of the swirl flow, but at the same time it will cause the adhesion and climbing of the liquid membrane in the inner wall of the separator. The increase of gas flow rate is the main factor, and the huge shear drag caused by rotating along the wall makes the droplets overcome their own gravity and shear resistance to climb along the wall to form a liquid film. The downdip of the inlet tube is beneficial to the formation of the stratified flow in the inlet tube, and it will reduce the swirl height of the fluid above the inlet of the cylinder and reduce the liquid carrying in the gas phase. Increasing the cylinder height of the upper part of the separator can expand the high efficiency operation range of the separator and improve the separation performance of the separator. The influence of the exhaust pipe insertion length on the high efficiency operation area of the separator is not as great as the change of the height of the upper cylinder.
【學(xué)位授予單位】:中國石油大學(xué)(華東)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2015
【分類號(hào)】:TE95
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