标题：Power consumption and gas-liquid mass transfer in a hot-sparged three-phase stirred reactor
作者：Zhang, Jinjin; Wang, Dengfei; Gao, Zhengming; Cai, Yating; Cai, Ziqi; Bao, Yuyun
作者机构：[Zhang, Jinjin] Shandong Univ Technol, Sch Chem & Chem Engn, Zibo 255000, Shandong, Peoples R China.; [Zhang, Jinjin; Gao, Zhengming; Cai, Yating; C 更多
通讯作者：Cai, ZQ;Bao, YY
通讯作者地址：[Cai, ZQ; Bao, YY]Beijing Univ Chem Technol, State Key Lab Chem Resource Engn, Sch Chem Engn, Beijing 100029, Peoples R China.
关键词：Power consumption; Volumetric mass transfer coefficient;; Gas-liquid-solid stirred reactor; Triple-impeller; Temperature
摘要：The volumetric mass transfer coefficient (k(L)a) is one of the most important parameters for design and scale up of gas-liquid-solid three-phase mechanically stirred tank reactors. In this work, the effects of agitation speed, superficial gas velocity, temperature, and volumetric solid concentration (C-v) on the power consumption and k(L)a were discussed and quantitatively analyzed. In an air-water-glass beads system, the gassed power number (N-PG ) and k(L)a increase remarkably with the temperature. At ambient temperature, k(L)a decreases significantly with increasing C-v with a power law exponent of 3.10, but this decreasing effect becomes weaker at higher temperatures. In this hot-sparged three-phase system, the addition of solids slows down the increasing tendency of N-PG with the temperature, but enhances the increasing tendency of k(L)a. The increase in temperature weakens the decreasing effect of C-v on k(L)a. Compared with the effect of temperature on N-PG and k(L)a, the effect of C-v is nearly negligible. As a practical guide to industrial applications, it is more effective to enhance the gas-liquid mass transfer by increasing the temperature or power consumption than by changing C-v or increasing superficial gas velocity. The empirical correlations of power consumption and k(L)a obtained in this work can provide helpful guidance for the industrial design and operation of hot-sparged three-phase stirred tank reactors. (C) 2019 Elsevier B.V. All rights reserved.