A comparative study of induced and transferred charges for mass flow rate measurement of pneumatically conveyed particles
A comparative study of induced and transferred charges for mass flow rate measurement of pneumatically conveyed particles
复制标题
气力输送颗粒质量流量测量中感应电荷和转移电荷的比较研究
DOI：
10.1016/j.powtec.2019.09.006
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发表时间：
2019-11-01
影响因子：
5.2
通讯作者：
Zhang, Wenbiao
中科院分区：
文献类型：
--
作者：
Hu, Yonghui;Yan, Yong;Zhang, Wenbiao
气力输送管道中固体质量流量的在线测量对于许多工业过程的高效和优化运行至关重要。本文提出了使用暴露于颗粒流的非侵入式电极的感应电荷和转移电荷进行质量流量测量的比较研究。一种新颖的信号调理电路由电流检测放大器和电荷放大器组成，旨在将感应和转移的电荷转换为两个单独的电压信号。提出了将粒子速度、感应电荷信号的均方根 (r.m.s) 幅度以及传输电荷信号的斜率与质量流量联系起来的经验测量模型。使用不同宽度的电极并在不同的质量流量和颗粒速度条件下进行实验。获得的结果表明，感应电荷信号的均方根幅度和传输电荷信号的斜率都随着质量流量和颗粒速度的增加而增加。一般来说，使用来自窄电极或宽电极的感应和转移电荷的测量结果是相似的。然而，由于传感区域有限以及粘附在电极表面的颗粒对电极充电，基于转移电荷的方法不太可靠。 (C) 2019 Elsevier B.V. 保留所有权利。
In-line measurement of the mass flow rate of solids in pneumatic conveying pipelines is essential for the efficient and optimized operation of many industrial processes. This paper presents a comparative study of using induced and transferred charges from non-intrusive electrodes exposed to the particle flow for mass flow rate measurement. A novel signal conditioning circuit, which consists of a current sense amplifier and a charge amplifier, is designed to convert the induced and transferred charges into two separate voltage signals. Empirical measurement models that relate the particle velocity, the root-mean-square (r.m.s) magnitude of the induced charge signal and the slope of the transferred charge signal to the mass flow rate are proposed. Experiments were undertaken using electrodes of different widths and under different mass flow rate and particle velocity conditions. Results obtained show that both the r.m.s magnitude of the induced charge signal and the slope of the transferred charge signal increase with the mass flow rate and the velocity of particles. In general, the measurement results using the induced and transferred charges from either the narrow or the wide electrode are similar. However, the method based on the transferred charge is less reliable due to confined sensing area and electrode charging by particles adhered to the electrode surface. (C) 2019 Elsevier B.V. All rights reserved.