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Research and Application of the Drag Reduction Technique of the DRA in the Natural Gas Pipelines |
HUANG Zhiqiang, HU Wengang, LI Qin, CHEN Zhen, WANG Nan |
School of Mechatronic Engineering in Southwest Petroleum University, Chengdu 610500, China |
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Abstract: 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.
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Received: 28 March 2013
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