天然气管道电加热解堵技术应用研究

Research on the Application of Electric Heating Blockage Removal Technology for Natural Gas Pipelines

针对天然气管道电加热解堵问题,借助CFD仿真软件建立管道与液体介质的流固耦合模型,模拟积水的融化规律和不同工况的解堵速率,分析电加热解堵技术对天然气管道的适用性。模拟计算结果表明:天然气管道应用电加热解堵技术,解堵初期,由于冰水混合区阻隔作用,解凝速率较小;而解堵的中后期,冰水界面热对流作用加强,解堵速率随之增大。另外,管道施加的温度越高,积水融化速度越快。但当管道内液相比例达到80%以上时,不同管壁温度解堵速率均呈下降趋势,且管壁施加温度越高,下降趋势越明显。研究结果为天然气管道电加热技术应用及解堵时间计算提供理论依据。

Aiming at the problem of blockage removal by electric heating of natural gas pipelines,a fluid-solid coupling model of pipelines and liquid media was established with the help of CFD simulation software.The melting law of stagnant water and the removal rate of blockage under different working conditions were simulated.The applicability of electric heating blockage removal technology to natural gas pipelines was analyzed.The simulation results showed that the electric heating blockage removal technology could be applied to the natural gas pipeline.In the initial stage of blockage removal,the decondensation rate was relatively small due to the blocking effect of the ice-water mixing zone.However,in the middle and late stage of blockage removal,the thermal convection effect of the ice-water interface was strengthened,and the blockage removal rate increased accordingly.In addition,the higher the temperature applied by the pipes,the faster the stagnant water melted.However,when the proportion of liquid phase in the pipeline was more than 80%,the blockage removal rates of different pipe wall temperatures all showed a downward trend,and the higher the applied temperature of the pipe wall,the more obvious the downward trend.The research results provide a theoretical basis for the application of electric heating technology for natural gas pipelines and the calculation of blockage removal time.