乙二烯三胺与三乙醇胺混合胺溶液CO2吸收剂研究

doi:10.12096/j.2096-4528.pgt.22002

摘要/Abstract

摘要：

为解决传统吸收剂的CO₂捕集工艺存在的再生能耗高及捕集效率低等问题，新型高效低能耗溶剂的研发已成为当前研究的重点。用二乙烯三胺(DETA)作为主体吸收剂，三乙醇胺(TEA)为辅助吸收剂，按总胺质量分数为30%的不同配比混合，以传统吸收剂单乙醇胺(MEA)质量分数30%作参考标准，进行CO₂吸收-解吸性能、解吸能耗及黏度测试研究，筛选出DETA+TEA吸收效果最优的配比。实验结果表明，当质量分数分别为20%、10%的DETA和TEA，不仅具有较高的CO₂吸收容量，而且具有优异的再生性能和较低的解吸能耗。该吸收剂饱和CO₂吸收量为3.71 mol/L溶剂，最大解吸速率为1.94 mmol/(L?min)，解吸能耗为160 kJ/mol，与质量分数30%MEA吸收剂相比，饱和吸收量提高了34.42%，最大解吸速率提高了170%，能耗降低了21.2%。20次循环稳定性高达98%，吸收剂使用黏度为3.1~6.88 mPa·s。

关键词: 二氧化碳捕集, 混合胺吸收剂, 吸收, 解吸, 能耗, 黏度

Abstract:

In order to solve the problems of high regeneration energy consumption and poor recycling rate in the CO₂ capture process of traditional absorbents, the research and development of new high-efficiency and low-energy-consumption solvents has become the focus of current research. In this experiment, diethylene triamine (DETA) was used as the main absorbent, and triethanolamine (TEA) was used as the auxiliary absorbent. The mixture was mixed according to different proportions with total amine concentration of 30%. Taking the traditional absorbent 30% monoethanolamine (MEA) as the reference standard, the CO₂ absorption-desorption performance, desorption energy consumption and viscosity were tested, the optimal ratio of DETA+TEA absorption was selected. The experimental results found that when the proportions was DETA+TEA= 20%+10%, the solution not only has highly CO₂ absorption capacity, but also has the excellent regeneration performance and low desorption energy consumption. The saturated uptake of the absorbent is 3.71 mol CO₂/L solvent, the maximum desorption rate is 1.94 mmol/(L?min), and the desorption energy consumption is 160 kJ/mol. Compared with the 30% MEA absorbent, the saturated uptake was increased by 34.42%, the maximum desorption rate was increased by 170%, and the energy consumption was reduced by 21.2%. The stability of 20 cycles is as high as 98%, and the viscosity of the absorbent is 3.1-6.88 mPa·s.

Key words: CO₂ capture, mixed amine absorent, absorption, desoription, energy consumption, viscosity

中图分类号:

TK 09

张欢, 汪丽, 叶舣, 赵兴雷. 乙二烯三胺与三乙醇胺混合胺溶液CO₂吸收剂研究[J]. 发电技术, 2022, 43(4): 609-617.

Huan ZHANG, Li WANG, Yi YE, Xinglei ZHAO. Study on CO₂ Absorbent of DETA and TEA Mixed Amine Solution[J]. Power Generation Technology, 2022, 43(4): 609-617.

图/表 12

图1 实验装置示意图1, 2, …, 11—阀门；12—N2进口；13—CO2气瓶；14—15% CO2标准气瓶；15—N2气体流量控制计；16—CO2气体流量控制计；17—气体流量显示仪；18—恒温水浴锅；19—常压反应釜；20—球形冷凝管；21—DC1006节能型智能恒温槽；22—HH-501BS循环恒温油浴锅；23—集水瓶；24—煤气分析仪；25—温度记录仪；26—电动搅拌机。

Fig. 1 Experimental setup diagram

图2 不同溶剂吸收过程CO2负载量随时间的变化情况

Fig. 2 Variation of CO2 loading with time in absorption process of different solvents

图3 不同溶剂吸收过程吸收速率随时间的变化情况

Fig. 3 Variation of the absorption rate with time in the absorption process of different solvents

图4 不同溶剂解吸过程CO2负载量随时间的变化情况

Fig. 4 Variation of CO2 loading with time during desorption process of different solvents

图5 解吸过程不同溶剂解吸速率随时间的变化情况

Fig. 5 Variation of desorption rate with time in the desorption process of different solvents

图6 1次完整吸收-解吸过程CO2负载量

Fig. 6 CO2 loading of a complete absorption-desorption process

图7 1次完整吸收-解吸过程CO2解吸率

Fig. 7 CO2 desorption rate of a complete absorption-desorption process

图8 20%DETA+10%TEA 的20次循环解吸量对比

Fig. 8 Comparison of desorption volume in 20 cycles of 20%DETA+10%TEA

表1 解吸能耗数据

Tab. 1 Desorption energy consumption calculation data

参数	30%MEA	20%DETA+10%TEA
$ψ$	30%	30%
Δt/℃	60	60
Δx/(mol CO₂/mol胺)	0.5	1.36
c/［kJ/(kg·K)］	3.236	2.365
M/(kg/mol CO₂)	0.061	0.115
ΔH_ads/(kg/mol CO₂)	90	80
q_g/(kg/mol CO₂)	58.5	40.39
Q_rs/(kg/mol CO₂)	54.56	39.51
W/(kg/mol CO₂)	203	160

表1 解吸能耗数据

Tab. 1 Desorption energy consumption calculation data

参数	30%MEA	20%DETA+10%TEA
$ψ$	30%	30%
Δt/℃	60	60
Δx/(mol CO₂/mol胺)	0.5	1.36
c/［kJ/(kg·K)］	3.236	2.365
M/(kg/mol CO₂)	0.061	0.115
ΔH_ads/(kg/mol CO₂)	90	80
q_g/(kg/mol CO₂)	58.5	40.39
Q_rs/(kg/mol CO₂)	54.56	39.51
W/(kg/mol CO₂)	203	160

图9 温度对黏度的影响

Fig. 9 Effect of temperature on viscosity

图10 40 ℃下负载量对黏度的影响

Fig. 10 Effect of loading on viscosity at 40 ℃

图11 40 ℃下不同吸收剂的黏度

Fig. 11 Viscosity of different absorbents at 40 ℃

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乙二烯三胺与三乙醇胺混合胺溶液CO₂吸收剂研究

Study on CO₂ Absorbent of DETA and TEA Mixed Amine Solution

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