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过程工程学报 ›› 2017, Vol. 17 ›› Issue (2): 224-230.DOI: 10.12034/j.issn.1009-606X.216265

• 流动与传递 • 上一篇    下一篇

叶片流道堵塞对单个旋风管影响的数值模拟

孙 扬1*, 管西旗1, 李 琦2   

  1. 1. 西南石油大学石油与天然气工程学院,四川 成都 610500;
    2. 西南油气田分公司输气管理处,四川 成都 610213
  • 收稿日期:2016-09-26 修回日期:2016-11-03 出版日期:2017-04-20 发布日期:2017-04-19
  • 通讯作者: 孙扬 sakyana@126.com

Simulation of Effects of Inter-vane Channel Blockup on Natural Gas Cyclone Separator

SUN Yang1*, GUAN Xi-qi1, LI Qi2   

  1.  
    1.School of Petroleum Engineering, Southwest Petroleum University, Chengdu, Sichuan 610500, China;
    2. Gas Pipe Department, Southwest Oil and Gas Field, Chengdu, Sichuan 610213, China
  • Received:2016-09-26 Revised:2016-11-03 Online:2017-04-20 Published:2017-04-19
  • Contact: Yang SUN sakyana@126.com

摘要: 针对轴向入口叶片式多管分离器中的一根旋风管,基于纳维斯托克方程和连续性方程,采用雷诺应力模型,并结合现场工况,使用有限体积法对单管旋风管内三种叶片流道堵塞情况下的速度场、压力场和动能耗散进行了数值计算,分析了压力损失和分离效率的变化. 结果表明,叶片堵塞会使环形分离空间的气流出现偏心,且影响宽度和深度随叶片堵塞个数增加而加深;叶片堵塞造成局部压力和速度的增高,使旋风分离器内压降增加;偏心气流和局部速度增加,造成分离效率随叶片堵塞数增加而略有上升;叶片堵塞不会导致旋风分离器分离效率下降,但是会提高压降、增大能耗,从而导致在压缩机输出功率不变的情况,因管路阻力增大而使流量减小,实质上是降低了处理气量,但短时不会造成气质降低. 分离器在正常情况下满足天然气处理要求,叶片堵塞时应及时清理堵塞物以保持额定的处理气量并降低能耗,稳定输气装置的负载.

关键词: 天然气, 旋风分离器, 堵塞, 分离效率, 叶片

Abstract: The axial inlet vane-type multi-tube separator’s structure and separation efficiency were analyzed based on the Navier-Stokes and continuity equations using the Reynolds stress model and the finite volume method. The velocity and pressure field of a single cyclone tube were simulated, and a discrete phase model was applied to study the separation efficiency by analyzing the motion pattern and the trajectories of the particles with different sizes in the separator. The results showed that the vanes’ channel blockup could cause an eccentric annular air separation space and that its affected width and depth both increase with increasing jammed vanes. Jammed vanes intensify the local pressure, velocity and pressure drop. The comprehensive influence of eccentric airflow and local speed should improve the separation efficiency as the number of jammed vanes increases. The separation efficiency should not decrease, but the pressure drop and energy consumption will both increase, thereby substantially reducing the processing volume if the compressor continues to provide invariable output power. However, this situation would not result in poor-quality natural gas in the short term. If the separator can meet the requirements of natural gas processing under normal circumstances, then the blockup should be cleared over time once it is able to maintain the rated processing capacity and reduce its energy consumption, which could stabilize the load of the gas-transmission devices.

Key words: Natural gas, Cyclone separator, Blockup, Separation efficiency, Vanes