基于EMD的密相气力输送两相流系统内子系统相互联系和作用

doi:10.16085/j.issn.1000-6613.2023-1357

化工进展 ›› 2024, Vol. 43 ›› Issue (2): 696-702.DOI: 10.16085/j.issn.1000-6613.2023-1357

基于EMD的密相气力输送两相流系统内子系统相互联系和作用

付飞飞¹(), 李健²

^1.潍坊学院机械与自动化学院，山东潍坊 261061
^2.大型发电装备安全运行与智能测控国家工程研究中心，东南大学能源与环境学院，江苏南京 210096

收稿日期:2023-08-08 修回日期:2023-09-11 出版日期:2024-02-25 发布日期:2024-03-07
通讯作者: 付飞飞
作者简介:付飞飞（1985—），女，副教授，研究方向为气固两相流检测技术。E-mail：20210116@wfu.edu.cn。
基金资助:
国家自然科学基金(51506074);潍坊学院博士科研启动基金(2022BS21)

Relationship and interaction between subsystems in gas-solid two-phase flow system of dense phase pneumatic conveying based on Empirical Mode Decomposition

FU Feifei¹(), LI Jian²

^1.School of Machinery and Automation, Weifang University, Weifang 261061, Shandong, China
^2.National Engineering Research Center of Power Generation Control and Safety, School of Energy and Environment, Southeast University, Nanjing 210096, Jiangsu, China

Received:2023-08-08 Revised:2023-09-11 Online:2024-02-25 Published:2024-03-07
Contact: FU Feifei

摘要/Abstract

摘要：

利用信号分析考察密相气力输送两相流系统内子系统之间的相互联系和作用。首先，基于经验模态分解（empirical mode decomposition，EMD）将密相气力输送两相流系统的静电波动信号分解成若干信号分量，即固有模态函数（intrinsic mode function，IMF），再结合各IMF分量的能量比重确定出IMF1~IMF4为主干分量。之后，结合静电信号EMD分解结果、输送管道中颗粒的分布状况及颗粒运动机理的差异性三者，明确气固两相流系统内的子系统。最后，利用IMF1~IMF4的主频和方差的变化规律，分别考察了子系统之间的联系和作用。实验结果表明：水平输送管道中的气固两相流系统可分成4个子系统，分别是稀相区、交界区、浓相区以及贴壁区内的颗粒流体组织；子系统之间依靠颗粒在彼此间游走而进行联系；同时，子系统之间也存在竞争作用，该竞争是颗粒主导和气流主导两种机制之间的竞争，当颗粒悬浮性较弱时竞争激烈，当颗粒悬浮性变好时竞争减弱。

关键词: 经验模态分解, 密相气力输送两相流系统, 子系统

Abstract:

Signal analysis was used to investigate the interconnection and interaction between the subsystems in the two-phase flow system of dense-phase pneumatic conveying. Firstly, based on empirical mode decomposition (EMD), electrostatic signals of a gas-solid two-phase flow system were decomposed into several signal components, namely intrinsic mode function (IMF) and the IMF1—IMF4, which were determined as major components by comparing the energy ratios of each IMF component. Afterward, subsystems of the gas-solid two-phase flow system were identified based on the decomposition results of electrostatic signals, the distribution of particles in the conveying pipeline, and the differences in particle motion mechanisms. Finally, the relationship and interaction between subsystems were inspected by the variation regulars of the dominant frequency and variance of IMF1—IMF4, respectively. Results show that: there are four subsystems within the whole two-phase flow system in the horizontal pipeline, which are the particle-fluid mixture in the dilute-phase area, the junction area, the dense-phase area, and the wall-attached area. Subsystems are related to each other by particles traveling between them. There is also an interaction between subsystems, which is a competition between particle-dominated and airflow-dominated mechanisms, and the competition becomes more and more furious when particle suspension is weak. In contrast, the competition weakens when particle suspension is good.

Key words: empirical mode decomposition, gas-solid two-phase flow system of the dense phase pneumatic conveying, subsystems

中图分类号:

付飞飞, 李健. 基于EMD的密相气力输送两相流系统内子系统相互联系和作用[J]. 化工进展, 2024, 43(2): 696-702.

FU Feifei, LI Jian. Relationship and interaction between subsystems in gas-solid two-phase flow system of dense phase pneumatic conveying based on Empirical Mode Decomposition[J]. Chemical Industry and Engineering Progress, 2024, 43(2): 696-702.

图/表 12

图1 密相气力输送系统原理1—电动调节阀；2—质量传感器；3—料罐；4—补充风；5—流化风；6—充压风；7—缓冲罐；8—高压气瓶；9—测试段；10—计算机；11—数据采集系统

图2 静电传感器检测探头

图3 探头内的主要结构

表1 各工况的输送参数

工况	质量流量/kg·s^-1	表观气速/m·s^-1	k
1	0.128	4.0	0.750
2	0.236	6.2	1.110
3	0.286	6.8	1.202
4	0.330	7.3	1.275

图4 各工况的静电输出信号

图5 工况4的静电信号EMD分解结果

图6 各工况下IMF的能量占比分布情况

图7 煤粉分布的ECT成像图

图8 水平管道中煤粉颗粒分布的示意图

表2 子系统内颗粒碰撞和受曳力情况

颗粒流体组织	碰撞情况	所受曳力
稀相区	较小	很强
交界区	一般	强
浓相区	较大	一般
贴壁区	较大且存在颗粒与管壁的碰撞作用	很弱

图9 IMF1~IMF4主频的变化规律

图10 IMF1~IMF4方差的变化

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基于EMD的密相气力输送两相流系统内子系统相互联系和作用

Relationship and interaction between subsystems in gas-solid two-phase flow system of dense phase pneumatic conveying based on Empirical Mode Decomposition

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