Decarbonization performance of downflow tubular gas-liquid contactor of microbubble-type

doi:10.16085/j.issn.1000-6613.2023-1344

Abstract

Abstract:

The micro bubble downflow tubular gas-liquid contactor is a kind of downward co-current gas-liquid contact mass transfer equipment. It enhances mass transfer by absorbing high-density micro bubbles generated by the high-speed liquid jet of the jet bubble generator, which has the advantages of compact structure, large gas-liquid contact area, and high mass transfer efficiency. Based on the performance experimental testing platform of a micro bubble downflow tubular gas-liquid contactor and the CO₂-N₂ mixed gas system, the effects of pump liquid volume on pressure drop and maximum natural suction capacity were first investigated. On this basis, the effects of different operational and structural parameters on its decarbonization performance were explored. The results showed that the micro bubble downflow tubular gas-liquid contactor adopted high-speed liquid jet negative pressure suction, the pressure drop and maximum natural suction capacity increased with the increase of liquid volume. When the liquid volume was 14L/min, the maximum natural suction capacity fluctuated within the range of 12.5—14L/min with the increase of column length; during the process of increasing the liquid volume from 4L/min to 14L/min, the pressure drop increased from 20kPa to 300kPa. The change in the length of the mass transfer section had a relatively small impact on the CO₂ removal rate, while the liquid to gas ratio and the inlet gas volume had a greater impact. The CO₂ removal rate increased with the increase of MDEA solution concentration, and the MDEA solution concentration decreased with the increase of cycle times. After three cycles of use, the absorption capacity significantly decreased. The self-designed micro bubble downflow tubular gas-liquid contactor had good decarbonization performance, with a maximum CO₂ removal rate of over 99%.

Key words: downflow tubular gas-liquid contactor, gas-liquid absorption, gas-liquid mixing, enhanced mass transfer, microbubble, carbon dioxide

摘要：

微气泡型下向流管式气液接触器是一种下行并流气液接触传质设备，通过射流气泡发生器产生的高密度微气泡来强化传质，具有结构紧凑、气液接触面积大和传质效率高等优点。基于微气泡型下向流管式气液接触器性能实验测试平台和CO₂-N₂混合气体体系，首先考察了泵入液量对压降和最大自然吸气量的影响，在此基础上探究了不同操作参数和结构参数对其脱碳性能的影响。结果表明，微气泡型下向流管式气液接触器采用高速液体射流负压吸气，压降和最大自然吸气量都随着泵入液量的增大而增大，当泵入液量为14L/min时，最大自然吸气量随着柱体长度的增加而在12.5~14L/min范围内波动；泵入液量在从4L/min增大到14L/min过程中，压降由20kPa增大到300kPa；传质段长度变化对CO₂脱除率的影响较小，液气比和鼔入气量对其影响较大，CO₂脱除率随着鼔入气量的增大而逐渐减小，随着液气比的增大而逐渐升高；CO₂脱除率随MDEA溶液浓度的增大而增大，且MDEA溶液浓度随循环次数增加而减小，在循环使用三次后吸收能力显著降低。自主设计的微气泡型下向流管式气液接触器脱碳性能较好，CO₂脱除率最高可达99%以上。

关键词: 下向流管式气液接触器, 气液吸收, 气液混合, 强化传质, 微气泡, 二氧化碳

CLC Number:

TQ021.1

YANG Hanyue, KONG Lingzhen, CHEN Jiaqing, SUN Huan, SONG Jiakai, WANG Sicheng, KONG Biao. Decarbonization performance of downflow tubular gas-liquid contactor of microbubble-type[J]. Chemical Industry and Engineering Progress, 2023, 42(S1): 197-204.

杨寒月, 孔令真, 陈家庆, 孙欢, 宋家恺, 王思诚, 孔标. 微气泡型下向流管式气液接触器脱碳性能[J]. 化工进展, 2023, 42(S1): 197-204.

Figures/Tables 11

References 18

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结构	尺寸
吸入室高度h₁ /mm	20
吸入室直径d₁ /mm	30
喷嘴直径d₂ /mm	4
喉管长度h₂ /mm	25
喉管直径d₃ /mm	7
扩散段角度α/(°)	8
柱体直径d₄ /mm	20
管式反应柱体长度/mm	400
管式气液接触器总长/mm	517.25

结构	尺寸
吸入室高度h₁ /mm	20
吸入室直径d₁ /mm	30
喷嘴直径d₂ /mm	4
喉管长度h₂ /mm	25
喉管直径d₃ /mm	7
扩散段角度α/(°)	8
柱体直径d₄ /mm	20
管式反应柱体长度/mm	400
管式气液接触器总长/mm	517.25

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