阵列凸起微通道内气液两相传质特性研究

doi:10.11949/0438-1157.20221061

摘要/Abstract

摘要：

研究了阵列凸起微通道内N-甲基二乙醇胺（MDEA）吸收CO₂过程的气液两相传质特性。在弹状流型下，考察了气液两相流量、MDEA浓度对体积传质系数、CO₂吸收效率、压力降以及能量损耗的影响。弹状气泡受到阵列凸起的挤压作用发生形变，促进了气液两相间的传质。与平滑通道相比，阵列凸起微通道在实验条件下具有更好CO₂吸收效率。在相同的能量损耗时，阵列凸起微通道具有更大的体积传质系数。

关键词: 阵列凸起微通道, 气液两相流, 传质, 吸收, CO₂

Abstract:

The gas-liquid two-phase mass transfer characteristics of CO₂ absorption into N-methyldiethanolamine (MDEA) aqueous solution in the microchannel with the array bulges were studied. The influences of gas/liquid flow rate and MDEA concentration on the volumetric mass transfer coefficient k_La, CO₂ absorption rate X, pressure drop ΔP and energy consumption ε were studied under slug flow regime. The deformation of slug bubbles due to the squeezing effect of the array bulges promotes the gas-liquid mass transfer efficiency. Compared with non-array bulge microchannel, the array bulge microchannel obviously enhanced CO₂absorption rate and has larger volumetric mass transfer coefficient for the same energy consumption.

Key words: array bulge microchannel, gas-liquid two-phase flow, mass transfer, absorption, CO₂

中图分类号:

TQ 021.4

何万媛, 陈一宇, 朱春英, 付涛涛, 高习群, 马友光. 阵列凸起微通道内气液两相传质特性研究[J]. 化工学报, 2023, 74(2): 690-697.

Wanyuan HE, Yiyu CHEN, Chunying ZHU, Taotao FU, Xiqun GAO, Youguang MA. Study on gas-liquid mass transfer characteristics in microchannel with array bulges[J]. CIESC Journal, 2023, 74(2): 690-697.

图/表 8

图1 微通道示意图

Fig.1 Schematic diagram of microchannels

表1 MDEA水溶液的物理性质

Table 1 Physical properties of MDEA aqueous solution

MDEA溶液浓度c/%

密度

ρ/(kg·m^-3)

黏度

µ/(mPa·s)

表面张力

σ / (mN·m^-1)

1005.4

1015.2

1025.0

1.290

1.941

3.092

59.30

55.20

53.00

图2 实验装置示意图

Fig.2 Schematic diagram of experimental setup

图3 阵列凸起微通道中CO2-MDEA水溶液的气液两相流型

Fig.3 Gas-liquid two-phase flow regimes of CO2-MDEA aqueous solution in microchannel with array bulges

图4 气液相流量和MDEA浓度对液体体积传质系数kLa的影响 (实心符号表示阵列凸起的微通道，空心符号表示平滑通道)

Fig.4 Effects of gas and liquid flow rates and MDEA concentration on volumetric mass transfer coefficient kLa (solid symbols for the microchannel with array bulges, hollow symbols for non-array bulge microchannel)

图5 气液相流量和MDEA浓度对CO2吸收效率的影响与气泡停留时间示意图 (实心符号表示阵列凸起的微通道，空心符号表示平滑通道)

Fig.5 The effect of gas and liquid flow rates and MDEA concentration on CO2 absorption efficiency and the bubble residence time (solid symbols for the microchannel with array bulges, hollow symbols for non-array bulge microchannel)

图6 气液相流量和MDEA浓度对压降ΔP的影响 (实心符号表示阵列凸起的微通道，空心符号表示平滑通道)

Fig.6 Effects of gas and liquid flow rates and MDEA concentration on pressure drop ΔP (solid symbols for the microchannel with array bulges, hollow symbols for non-array bulge microchannel)

图7 液侧传质系数随能耗变化 (实心符号表示阵列凸起的微通道，空心符号表示平滑通道)

Fig.7 Relationship between liquid side volumetric mass transfer coefficient and energy consumption (solid symbols for the microchannel with array bulges, hollow symbols for non-array bulge microchannel)

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