Pressure Drop of Liquid–Solid Two-Phase Flow in the Vertical Tube Bundle of a Cold-Model Circulating Fluidized Bed Evaporator

被引：2

作者：

Jiang F. ^{[1
]}

Lv S. ^{[1
]}

Qi G. ^{[2
]}

Chen X. ^{[1
]}

Li X. ^{[1
]}

机构：

[1] School of Chemical Engineering and Technology, Tianjin University, Tianjin

[2] School of Biological and Environmental Engineering, Tianjin Vocational Institute, Tianjin

来源：

Transactions of Tianjin University | 2019年 / 25卷 / 06期

关键词：

Circulating fluidized bed evaporator; Descaling; Fouling prevention; Heat transfer enhancement; Liquid–solid two-phase flow; Pressure drop; Vertical tube bundle;

D O I：

10.1007/s12209-019-00212-z

中图分类号：

学科分类号：

摘要：

A cold-model vertical multi-tube circulating fluidized bed evaporator was designed and built to conduct a visualization study on the pressure drop of a liquid–solid two-phase flow and the corresponding particle distribution. Water and polyformaldehyde particle (POM) were used as the liquid and solid phases, respectively. The effects of operating parameters such as the amount of added particles, circulating flow rate, and particle size were systematically investigated. The results showed that the addition of the particles increased the pressure drop in the vertical tube bundle. The maximum pressure drop ratios were 18.65%, 21.15%, 18.00%, and 21.15% within the experimental range of the amount of added particles for POM1, POM2, POM3, and POM4, respectively. The pressure drop ratio basically decreased with the increase in the circulating flow rate but fluctuated with the increase in the amount of added particles and particle size. The difference in pressure drop ratio decreased with the increase in the circulating flow rate. As the amount of added particles increased, the difference in pressure drop ratio fluctuated at low circulating flow rate but basically decreased at high circulating flow rate. The pressure drop in the vertical tube bundle accounted for about 70% of the overall pressure drop in the up-flow heating chamber and was the main component of the overall pressure within the experimental range. Three-dimensional phase diagrams were established to display the variation ranges of the pressure drop and pressure drop ratio in the vertical tube bundle corresponding to the operating parameters. The research results can provide some reference for the application of the fluidized bed heat transfer technology in the industry. © 2019, Tianjin University and Springer-Verlag GmbH Germany, part of Springer Nature.

引用

页码：618 / 630

页数：12

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