页岩气测试平台波纹板分离器的分离性能研究

页岩气测试平台排液测试期气流的饱和含水量大,分离器内部流体运动规律复杂,现场气液分离过程的分离效率不理想。为了得到波纹板分离器各参数对其分离性能的影响规律,建立了波纹板流道的数学模型,并推导出了波纹板分离效率的理论计算公式。为了对其理论计算公式进行验证,采用FLUENT软件对影响其性能的因素进行了分析研究。研究结果表明:在一定范围内增加波纹板入口流速或减小板间距时,波纹板流道各波段内气流的加速效果明显增强;液滴的运动轨迹与气流的高速区域基本一致,当液滴粒径增大至10μm后,波纹板分离器的粒级效率曲线变陡峭,增加波纹板入口流速或减小板间距可使曲线敏感点左移,波纹板分离性能明显改善,其分离效率最高可达90%。将波纹板分离效率模拟结果与理论计算结果进行了对比,发现多流道分离效率模拟值和理论值之间的最大误差为10%左右,从而验证了理论计算方法的可靠性。研究结果可为波纹板气液分离器的设计及应用提供指导。

Study on Separation Performance of Corrugated Plate Separator on Shale Gas Test Platform

The gas flow of the shale gas test platform has a large saturated water content during the period of unloading test,and the law of motions of fluids inside the separator is complicated.Thus,the on-site gas-liquid separation efficiency is not satisfactory.In order to obtain the law of influencing of various corrugated plate separator parameters on its separation performance,a mathematic model of corrugated plate flow pass was built and the theoretical formula for calculating the separation efficiency of corrugated plate was derived.To validate the theoretical calculating formula,FLUENT software was applied in the analysis and study of the factors affecting its performance.The results show that the gas flow of each channel in the corrugated plate flow pass accelerated obviously when increasing the flow rate at the corrugated plate separator inlet or decreasing the plate spacing within certain limits;the motion curve of liquid droplets is basically consistent with the high-velocity zone of the gas flow.The grade efficiency curve of the corrugated plate separator will become steep when the liquid droplet size increased to 10μm;by increasing the flow rate at the corrugated plate separator inlet or decreasing the plate spacing,the curve’s sensitive point will move left,and its separation performance will be obviously improved,with a separation efficiency up to 90%.Comparing the simulation results of corrugated plate separation efficiency with theoretical results,it is found that the maximum error between the simulated and theoretical values of the multi-pass separation efficiency is about 10%,which verifies the reliability of the theoretical calculation method.The study results can provide guidance for the design and application of corrugated plate gas-liquid separators.