天然气管输减阻剂减阻技术的研究与应用

 通过电镜微观试验研究，揭示了天然气减阻剂的减阻机制。通过对减阻剂加剂装置关键结构仿真优化表明：旋流雾化喷嘴的旋流室内锥角为100°时雾化效果最佳；喷孔直径的变化可改变减阻剂喷射的轴向速度，有利于增大喷射距离，但雾化角减小，喷孔直径为1.4 mm时，喷嘴的雾化效果最佳；旋流室切向孔角度对旋流室内部速度流场的影响较大，切向角为14°时喷嘴雾化效果最佳；通过实验室及现场试验，得出了合理加剂量的计算公式。本研究对天然气管输减阻剂减阻技术的推广与应用具有指导意义。

Research and Application of the Drag Reduction Technique of the DRA in the Natural Gas Pipelines

With the "gasification" process guided by China's energy strategy, during the 12th Five-Year Plan, the gas pipeline mileage will have a significant growth, and expect to reach 100,000 kilometers by 2015. This paper analyzes the mechanisms of the film forming and the drag reduction of the DRA through the electron microscope micro tests. In the optimization of the key structure in the injection device, it is shown that the change of the cone angle of the swirl chamber has a great impact on the spray angle of the swirl atomizer, the atomizing results are best when the cone angle of the swirl chamber is 100°. The change of the nozzle outlet diameter may change the the axial velocity of the drag reducing agent injection, it would lead to the increase of the spray distance, which, however, would decrease the spray angle. When the diameter of the nozzle outlet is 1.4mm, the tangential angle of the spin chamber is 14°, the atomizing results are the best. A computation formula of the reasonable dose is obtained through a method of combining the laboratory and field testings. Finally, the field experiment is developed in the pipeline of LAN-YIN. The findings provide a guidance for the extension and application of the technology of natural gas DRA.