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过程工程学报 ›› 2016, Vol. 16 ›› Issue (4): 571-576.DOI: 10.12034/j.issn.1009-606X.216122

• 流动与传递 • 上一篇    下一篇

背压对U阀排料特性的影响

焦方冉1,李洪钟2,朱庆山2   

  1. 1. 中国科学院过程工程研究所多相复杂系统国家重点实验室
    2. 中国科学院过程工程研究所
  • 收稿日期:2016-01-21 修回日期:2016-02-25 出版日期:2016-08-20 发布日期:2016-10-10
  • 通讯作者: 焦方冉 frjiao@ipe.ac.cn
  • 基金资助:
    国家自然科学基金

Influence of Back Pressure on Discharge Property of U-valve

JIAO Fang-ran 1,LI Hong-zhong 2,ZHU Qing-shan 2   

  1. 1. State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, CAS
    2.
  • Received:2016-01-21 Revised:2016-02-25 Online:2016-08-20 Published:2016-10-10
  • Contact: JIAO Fang-ran frjiao@ipe.ac.cn

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摘要： 实验研究了背压对U阀排料特性的影响，建立了可调节背压的立管?U阀实验平台，发现随背压增大，U阀排料速率明显减小，进气速率对排料速率的调控能力变弱，且背压波动时，孔口的高度越小，U阀的运行越稳定. 针对本实验装置，背压小于7 kPa时，U阀孔口高度小于0.11 m，背压大于13 kPa时，孔口高度大于0.15 m，使U阀获得良好的排料特性. 根据实验数据和理论分析建立了U阀排料速率与背压、进气速率和孔口高度之间的经验方程，计算值与实验值的平均相对误差为20.9%.

关键词: U阀, 背压, 排料特性, 孔口高度

Abstract: In order to investigate the influence of the back pressure on the solid discharge rate of the U-valve, a setup with adjustable back pressure was established. Experimental results revealed that the solid discharge rate, as well as the effective aeration rate on the solid discharge rate decreased with increasing the back pressure. Both the back pressure and the orifice height had significant influence on the discharge behavior of the U-valve. When the back pressure fluctuation was significant, the operation of the U-valve was more stable with a smaller orifice height. The orifice height had a suitable range to obtain a stable discharge rate, i.e., the orifice height was less than 0.11 m, the back pressure was less than 7 kPa, the back pressure was greater than 13 kPa, and the orifice height was more than 0.15 m. In addition, the solid discharge rate was correlated with the back pressure, the aeration rate, and the orifice height. The average relative error was 20.9% between the calculated and the experimental data. Based on this correlation, the reasonable range of orifice height was calculated to provide the guidance for the design of U-valves.

Key words: U-valve, back pressure, solid discharge property, orifice height

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