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西气东输二线输送介质为中亚进口气源,其输送介质的气质较差,为了避免管道冰堵造成分输量不足或严重的停输事件,分析了冰堵产生的原因:分输压差较大、分输时温降起伏大、水露点较高。基于此,建立了防止冰堵的预警逻辑:根据冰堵初期管道的工作调压阀后压力与开度、分输出站压力以及流量计流量等参数变化情况,判断是否形成了初期冰堵现象;通过对调压阀后压力和分输出站压力进行逻辑运算,得出初期冰堵位置,并使用Logix5000软件实现SCADA系统防冰堵预警逻辑。现场模拟应用结果表明:该方法能有效实现分输场站不同区域冰堵报警预判,为天然气管道预防冰堵提供了参考方法。
Second West-East gas transmission medium for Central Asia imported gas source, the transmission medium of the temperament is poor, in order to avoid the pipeline ice block caused by inadequate or serious stop transportation event, the analysis of the causes of ice blocking: sub-pressure Big difference, when the temperature drop drops, water dew point higher. Based on this, an early warning logic to prevent ice blockage was established: according to the pressure and opening of the working pressure regulating valve in the early stage of the ice blockage, the pressure of the output station and the flow rate of the flowmeter were changed to determine whether the initial ice blockage was formed; Logical operation of the post-pressure regulator valve and sub-station pressure results in the initial ice blockage position, and the use of Logix5000 software to achieve SCADA system anti-ice warning logic. The results of field simulation show that this method can effectively predict the ice blocking alarm in different areas of the substation yard and provide a reference method for preventing the ice blockage of the natural gas pipeline.