Flow behavior and stripping enhancement of CO2 desorption process in microreactor

doi:10.11949/0438-1157.20190142

Abstract

Abstract:

The flow pattern and stripping enhancement of CO₂ desorption from N-methyldiethanolamine solution were investigated in microreactor. It is observed that the gas-liquid two-phase flow patterns in the desorption process mainly include bubble flow, slug flow, annular flow and fine circulation. However, the periodic change of flow patterns resulted in the fluctuation of bubble velocity at high temperature. According to the results of stripping enhancement on the CO₂ desorption, it showed that CO₂ desorption rate was significantly enhanced at low solution rate by adding small amount of inert gas, while excessive gas will lead to a reduction in the solution residence time. The optimal inert gas flow rate was determined by calculating the stripping enhancement per unit gas flow rate.

Key words: microreactor, CO₂ capture, desorption, N-methyldiethanolamine, flow pattern, stripping

摘要：

研究了微反应器内N-甲基二乙醇胺溶液解吸过程的流动和气提强化行为。观测到解吸过程中气-液两相流型主要有泡状流、弹状流、环状流和细环流。高温时，流型交替演化将导致气泡速度波动。气提促进强化CO₂解吸过程的结果表明，低溶液流量时，少量惰性气体就可显著提高CO₂解吸速率；大惰性气体流量将缩短停留时间，经计算解吸强化效率，确定了解吸过程的最佳气提流量。

关键词: 微反应器, 二氧化碳捕集, 解吸, N-甲基二乙醇胺, 流型, 气提

CLC Number:

TQ 028.3

Hongchen LIU, Feng ZHOU, Chaoqun YAO, Guangwen CHEN. Flow behavior and stripping enhancement of CO₂ desorption process in microreactor[J]. CIESC Journal, 2019, 70(7): 2448-2455.

刘宏臣, 周峰, 尧超群, 陈光文. 微反应器内CO₂解吸过程流动行为及气提强化[J]. 化工学报, 2019, 70(7): 2448-2455.

Figures/Tables 10

Fig.1 Schematic diagram of microreactor and compact microreactor with part-sectional view

Fig.2 Schematic diagram of experimental setup

Fig.3 Flow regimes in microchannels during CO2 desorption

Fig.4 Periodic change of flow patterns in microchannels during CO2 desorption

Fig.5 Bubble velocity as function of time

Fig.6 Effect of bubble velocity on growth rate of bubble length

Fig.7 Effect of solution flow rate and desorption temperature on growth rate of bubble length

Fig.8 Effects of N2 flow rate on CO2 desorption rate and CO2 desorption percentage at different solution flow rate

Fig.9 Effects of N2 flow rate on ratio of CO2 desorption rate and stripping enhancement per unit gas flow rate as function of gas flow rate

Fig.10 Effects of N2 flow rate on CO2 desorption rate and CO2 desorption percentage at different CO2 loading

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Flow behavior and stripping enhancement of CO₂ desorption process in microreactor

微反应器内CO₂解吸过程流动行为及气提强化

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