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过程工程学报 ›› 2019, Vol. 19 ›› Issue (3): 510-515.DOI: 10.12034/j.issn.1009-606X.218273

• 流动与传递 • 上一篇    下一篇

天然气水合物提纯螺旋分离器性能数值模拟

李学峰1， 何霞1， 王国荣1*， 邱顺佐1， 周守为2,4， 刘清友1,3,4   

  1. 1. 西南石油大学机电工程学院，四川 成都 610500 2. 中国海洋石油总公司，北京 100010 3. 西华大学流体机械及动力机械教育部重点实验室，四川 成都 610039 4. 西南石油大学油气藏地质及开发工程国家重点实验室，四川 成都 610500
  • 收稿日期:2018-09-03 修回日期:2018-10-08 出版日期:2019-06-22 发布日期:2019-06-20
  • 通讯作者: 王国荣 200331010023@swpu.edu.cn
  • 基金资助:
    重点研发计划项目“海洋水合物固态流化测试新技术-天然气水合物高效破岩研究”;中国工程院战略咨询项目“我国深水工程技术和深水装备发展战略研究-海底浅层天然气水合物于矿产资源发展战略研究”;国家重点研发计划——双层连续管双梯度钻井举升系统研发

Numerical simulation of performance of spiral separator for natural gas hydrate purification

Xuefeng LI1, Xia HE1, Guorong WANG1*, Shunzuo QIU1, Shouwei ZHOU2,4, Qingyou LIU1,3,4   

  1. 1. College of Mechatronic Engineering, Southwest Petroleum University, Chengdu, Sichuan 610500, China 2. China National Offshore Oil Corporation, Beijing 100010, China 3. Key Laboratory for Fluid Machinery and Power Machinery, Ministry of Education, Xihua University, Chengdu, Sichuan 610039, China 4. State Key Laboratory of Oil and Gas Reservoir Geology and Development Engineering, Southwest Petroleum University, Chengdu, Sichuan 610500, China
  • Received:2018-09-03 Revised:2018-10-08 Online:2019-06-22 Published:2019-06-20

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摘要： 针对海底浅层天然气水合物开采中产砂量大而造成管路堵塞、设备磨损的问题，基于固态流化开采方法，提出天然气水合物原位分离的思路，结合水合物混合浆体物性参数设计井下原位螺旋分离器，采用CFD-Fluent商业软件建立分析模型并进行模型正确性验证，考察了固相水合物体积浓度、固相砂体积浓度和入口流速对分离装置性能的影响。结果表明，研究范围内砂去除率和水合物回收率均约为80%，随水合物体积分数增大，砂去除率和水合物回收率变化非常小，分离器压降变化很小；随砂体积分数增大，砂去除率急剧降低，而水合物回收率急剧增加，压降急剧增大；随入口速度增加，砂去除率和水合物回收率不断增大，分离器压降不断增大。设计的螺旋分离器在水合物原位除砂提纯中性能优异，水合物饱和度对分离器性能影响不大，但粉砂浓度对分离器性能影响较明显，工程应用中需要重点考虑；入口速度对分离器分离性能起关键性作用，决定了分离器的处理能力，适当提高入口速度可一定程度提高分离器的分离效率。

关键词: 天然气水合物, 螺旋分离, 提纯除砂, CFD-Fluent

Abstract: In view of the problems of pipeline blockage and equipment wear caused by large sand production in shallow marine gas-hydrate mining under seabed, based on the solid fluidized mining method, the idea of in-situ separation of natural gas hydrate was proposed. The downhole in-situ spiral separator was designed based on the physical parameters of hydrate mixed slurry. The correctness of the model was verified by CFD-Fluent software. Then, the performance of the separation device was studied from three aspects: solid phase hydrate volume concentration, solid phase sand volume concentration and inlet velocity. The results showed that within the scope of the study, the removal rate of sand and the recovery rate of hydrate were both about 80%. As the volume fraction of hydrate increased, the sand removal rate and hydrate recovery rate changed very little, and the separator pressure drop changed little. As the sand volume fraction increased, the sand removal rate decreased sharply, while the hydrate recovery rate increased sharply and the pressure drop increased sharply. As the inlet velocity increased, both the sand removal rate and the hydrate recovery rate increased, and the separator pressure drop also increased. The spiral separator exhibited very good performance in hydrate in situ sand removal purification. The saturation of hydrate had little effect on the performance of the separator, but the influence of silt concentration on the performance of the separator was obvious, and it needed to be considered in engineering application. The inlet velocity played a key role in the separation performance of the separator, and also determined the processing capacity of the separator. Appropriately increasing the inlet velocity could improve the separation efficiency of the separator to a certain extent. The analysis results have certain guiding significance for the exploitation of shallow hydrate reservoirs on the seabed.

Key words: Natural gas hydrate, Spiral separation, Sand removal, CFD