组合式三相分离器内气液分离元件的开发研究

发布时间：2018-07-28 21:16

【摘要】：本文根据组合式三相分离器中气液分离的要求开发出一种装有单根滤芯的聚结过滤装置。试验中采用不同结构参数的滤芯进行了有关阻力特性、分离效率、进出口液滴粒径测量等研究。结合Fluent软件研究了基准结构内部的气液两相流场,得到了气相的流动状态、液滴的分布及逃逸规律,并进行了结构优化。结果表明:操作参数和结构参数均会对天然气聚结过滤器的阻力特性及气液分离效率产生影响。同一流量下减小滤芯的过滤面积,装置进出口压差会增加。当入口流量较低时,气液分离效率随流量的增大而提高,但当流量超过临界流量后,分离效率会迅速下降。气液分离效率与入口液滴粒径的尺度有密切的关系,试验装置对中位粒径为8.7μm的液滴群的捕集效率显著低于中位粒径为40μm的液滴群。当入口液滴浓度在30~75g/m3范围内变化时,气液分离效率随加入液滴浓度的增加而提高,主要原因是液滴浓度越高,液滴聚并的几率也越大,大粒径的液滴更易于捕集。当滤芯的过滤精度由10μm提高到2μm时,气液分离效率随之提高,但阻力损失会随之增加。过滤面积较小的滤芯更适合在低气体流量下进行分离操作。试验中通过激光粒度仪对分离器进出口处液滴粒径进行在线测量,发现粒径大于8μm的液滴基本除尽。通过试验得出了滤芯过滤精度与极限分离粒径之间的对应关系。通过Fluent软件对内部流动规律进行模拟,发现通过滤芯的气量具有轴向的不均匀性,67.7%的气流通过滤芯的上部区域进入排气管。优化了入口结构,新结构可以改善滤芯轴向气量的分布但不显著增加能耗。
[Abstract]:According to the requirement of gas-liquid separation in combined three-phase separator, a kind of coalescence filter device with single filter element is developed in this paper. The characteristics of resistance, separation efficiency and particle size measurement of liquid droplets were studied by using filter elements with different structure parameters. Combined with Fluent software, the gas-liquid two-phase flow field in the reference structure is studied, and the gas phase flow state, droplet distribution and escape law are obtained, and the structure optimization is carried out. The results show that both the operating parameters and the structure parameters have an effect on the resistance characteristics and the gas-liquid separation efficiency of the natural gas coalescence filter. At the same flow rate, the pressure difference between the inlet and outlet of the device will increase. When the inlet flow rate is low, the gas-liquid separation efficiency increases with the increase of the flow rate, but when the flow rate exceeds the critical flow rate, the separation efficiency will decrease rapidly. The efficiency of gas-liquid separation is closely related to the size of the inlet droplet size. The trapping efficiency of the experimental device for the droplet group with a median diameter of 8.7 渭 m is significantly lower than that of the liquid droplet group with a median diameter of 40 渭 m. When the concentration of the inlet droplet changes in the range of 30~75g/m3, the efficiency of gas-liquid separation increases with the increase of the concentration of the added droplet, the main reason is that the higher the concentration of the droplet, the greater the probability of droplet aggregation, and the larger the size of the droplet is, the easier it is to trap the droplet. When the filter precision is increased from 10 渭 m to 2 渭 m, the gas-liquid separation efficiency increases, but the resistance loss increases. The filter with small filter area is more suitable for separation operation at low gas flow rate. In the experiment, the particle size of the liquid droplets at the inlet and outlet of the separator was measured by laser particle size analyzer, and it was found that the droplets with diameter larger than 8 渭 m were basically eliminated. The relationship between the filter precision and the particle size of the limit separation is obtained by experiments. The internal flow pattern was simulated by Fluent software and it was found that 67.7% of the air flow through the upper part of the filter entered the exhaust pipe. By optimizing the inlet structure, the new structure can improve the axial flow distribution of the filter core, but not increase the energy consumption significantly.
【学位授予单位】：中国石油大学(华东)
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TE953

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