微通道内两相吸收剂TETA/DEEA吸收CO2过程的传质研究

doi:10.11949/0438-1157.20241447

摘要/Abstract

摘要：

利用高速摄像研究了微通道内两相吸收剂三乙烯四胺/二乙氨基乙醇（TETA/DEEA）的CO₂吸收传质特性，系统考察了气液两相流量、吸收剂总胺浓度及总胺中TETA占比对初始气泡长度L_B0、气泡体积减小量ΔV_B、CO₂吸收率φ和液侧体积传质系数k_La的影响。结果表明，L_B0与ΔV_B密切相关，均随液体流量、总胺浓度和总胺中TETA占比的增加，以及气体流量的降低而降低。CO₂吸收率随气体流量的增加而降低，随总胺中TETA占比的增加呈现先增加后降低的趋势。实验测得的k_La值在0.88~13.65 s^-1之间，比传统反应器高1~2个数量级，表明微通道反应器可显著强化TETA/DEEA两相吸收剂捕集CO₂过程。此外，基于实验数据提出了k_La预测关联式，预测效果较好。

关键词: 微通道, 两相吸收剂, 吸收, 气液两相流, 传质

Abstract:

The CO₂ absorption and mass transfer characteristics of the TETA/DEEA (triethylenetetramine/diethylaminoethanol) biphasic absorbent solution in the microchannel were investigated by high-speed video, and the effects of two-phase flow rates, absorbent concentration, and TETA proportion in the total amine on the initial bubble length L_B0, bubble volume reduction ΔV_B, CO₂ absorption percent φ and liquid-side volumetric mass transfer coefficient k_La were systematically examined. The results show that L_B0is closely related to ΔV_B, and both decrease with the increase of liquid flow rate, total amine concentration and the proportion of TETA in total amines, as well as the decrease of gas flow rate. For CO₂ absorption percent, it decreased with the increase of gas flow rate, and showed a tendency of increasing and then decreasing with the increase of TETA proportion. The experimentally measured k_La values ranged from 0.88 s^-1 to 13.65 s^-1, which were 1—2 orders of magnitude higher than those of the conventional reactor, indicating that the microchannel reactor can significantly enhance the CO₂ capture process by the TETA/DEEA biphasic absorbent. In addition, based on the experimental data, an empirical correlation was proposed to predict the k_La with good prediction performance.

Key words: microchannels, biphasic absorbent, absorption, gas-liquid flow, mass transfer

中图分类号:

TQ 021.4

米晓天, 刘宏臣, 王克军, 唐文娜, 徐永伟, 杨梅. 微通道内两相吸收剂TETA/DEEA吸收CO₂过程的传质研究[J]. 化工学报, 2025, 76(6): 2667-2677.

Xiaotian MI, Hongchen LIU, Kejun WANG, Wenna TANG, Yongwei XU, Mei YANG. Mass transfer study of CO₂ absorption by TETA/DEEA biphasic absorbent in the microchannel[J]. CIESC Journal, 2025, 76(6): 2667-2677.

图/表 14

表1 TETA/DEEA两相吸收剂的物性参数

Table 1 Physical properties of the TETA/DEEA biphasic solvents

C_TETA/(mol/L)	C_DEEA/(mol/L)	总胺浓度 C_T/(mol/L)	总胺中TETA 占比M	密度 ρ/(kg·m^-3)	黏度 μ/(mPa·s)
0.5	2.0	2.5	0.2	965	7.6
0.6	2.4	3.0	0.2	970	12.2
0.7	2.8	3.5	0.2	968	22.3
0.8	3.2	4.0	0.2	948	30.7
1.6	2.4	4.0	0.4	979	78.9
2.4	1.6	4.0	0.6	989	118.8
3.2	0.8	4.0	0.8	992	122.6

图1 (a)微通道结构示意图；(b)实验装置流程

Fig.1 (a) Schematic diagram of the microchannel structure;(b) Sketch of the experimental setup

图2 微通道内气液两相流型

Fig.2 Typical flow patterns for gas-liquid flow in the microchannel

图3 气液流量对初始气泡长度的影响

Fig.3 Effect of gas-liquid two-phase flow rates on initial bubble length (CT=4 mol/L, M=0.2)

图4 吸收剂总胺浓度CT对初始气泡长度的影响

Fig.4 Effect of absorbent concentrations on initial bubble length (M=0.2, QG=20 mL/min)

图5 总胺中TETA占比对初始气泡长度的影响

Fig.5 Effect of TETA proportion on initial bubble length (CT=4 mol/L, QG=20 mL/min)

图6 气体流量对气泡体积减小量(a)和CO2吸收率(b)沿微通道演变规律的影响

Fig.6 Effect of gas flow rates on the evolution of bubble volume reduction (a) and CO2 absorption percent (b) along the microchannel (QL=3 ml/min, CT=4 mol/L, M=0.2)

图7 液体流量对气泡体积减小量(a)和CO2吸收率(b)沿微通道演变规律的影响

Fig.7 Effect of liquid flow rates on the evolution of bubble volume reduction (a) and CO2 absorption percent (b) along the microchannel (QG=4 ml/min, CT=4 mol/L, M=0.2)

图8 吸收剂总胺浓度CT对气泡体积减小量(a)和CO2吸收率(b)沿微通道演变规律的影响

Fig.8 Effect of absorbent concentrations on the evolution of bubble volume reduction (a) and CO2 absorption percent (b) along the microchannel (M=0.2, QL=5 ml/min, QG=20 mL/min)

图9 总胺中TETA占比对气泡体积减小量(a)和CO2吸收率(b)沿微通道演变规律的影响

Fig.9 Effect of TETA proportion on the evolution of bubble volume reduction (a) and CO2 absorption percent (b) along the microchannel (CT=4 mol/L, QL=5 ml/min, QG=20 mL/min)

图10 气液流量对液侧体积传质系数的影响

Fig.10 Effect of gas-liquid flow rates on liquid side volumetric mass transfer coefficient (CT=4 mol/L, M=0.2)

图11 吸收剂总胺浓度CT对液侧体积传质系数的影响

Fig.11 Effect of absorbent concentrations on liquid side volumetric mass transfer coefficient (M=0.2, QG=20 ml/min)

图12 总胺中TETA占比对液侧体积传质系数的影响

Fig.12 Effect of TETA proportion on liquid side volumetric mass transfer coefficient (CT=4 mol/L, QG=20 ml/min)

图13 kLa实验值与预测值的比较

Fig.13 Comparison of experimental and predicted values of kLa

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微通道内两相吸收剂TETA/DEEA吸收CO₂过程的传质研究

Mass transfer study of CO₂ absorption by TETA/DEEA biphasic absorbent in the microchannel

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