N-氨乙基哌嗪与甘氨酸钠CO2吸收剂配方研究

doi:10.12096/j.2096-4528.pgt.22017

摘要/Abstract

摘要：

化学吸收法是捕集燃煤电厂烟气中CO₂应用最为广泛的技术之一，但其存在吸收容量较低及再生能耗较高等问题，因此开发新型高效CO₂吸收剂代替传统单乙醇胺(MEA)吸收剂是当前研究的重点之一。以质量分数为30%的MEA作为参考标准，研究不同配比的N-氨乙基哌嗪(AEP)+甘氨酸钠(SG)复配溶液对CO₂的吸收和解吸性能，通过添加不同助剂调节溶液pH值提高吸收剂再生性能，通过对比吸收剂的吸收量、吸收速率、解吸量、解吸速率、吸收-解吸循环性能以及再生能耗，优选出35%AEP+5%SG+1%柠檬酸为最优复配吸收剂。结果表明，配比为35%AEP+5%SG+1%柠檬酸吸收剂CO₂吸收量3.70 mol/L，解吸量为3.55 mol/L，解吸率达96.05%，单位再生能耗为136.75 kJ/mol，与质量分数30%MEA相比，吸收量提高1.18倍，解吸量增加2.17倍，解吸率提高30.93%，再生能耗下降33.90%。经过10次循环试验后，该复配溶液循环稳定性良好，再生性能较优，具有潜在的应用价值。

关键词: 二氧化碳捕集, 燃煤电厂, CO₂吸收剂, N-氨乙基哌嗪(AEP), 甘氨酸钠, 柠檬酸

Abstract:

Chemical absorption method is one of the most widely used technologies to capture CO₂ from flue gas of coal-fired power plants, but it has problems of low absorption capacity and high regeneration energy consumption. Therefore, it is one of the current research focuses to develop a new efficient CO₂ absorbent to replace the traditional monoethanolamine (MEA) absorbent..To study the CO₂ absorption and desorption performance of aminoethylpiperazine (AEP)+sodium glycinate (SG) complex solution with different proportions, 30%MEA was used as a reference standard. By adding different additives to adjust the pH value of the solution, the regeneration performance of the absorbent was improved. According to the absorption capacity, absorption rate, desorption capacity, desorption rate, absorption-desorption cycle performance and regeneration energy consumption of the absorbent, 35%AEP+5%SG+1% citric acid was selected as the best compound absorbent. The results show that the ratio of 35%AEP+5%SG+1% citric acid absorbent CO₂ absorption is 3.70 mol/L, desorption capacity is 3.55 mol/L, desorption rate is 96.05%, unit regeneration energy consumption is 136.75 kJ/mol. Compared with 30%MEA, the absorption capacity is increased by 1.18 times, desorption capacity is increased by 2.17 times, desorption rate is increased by 30.93%, and regeneration energy consumption is decreased by 33.90%. After 10 cycle tests, the compound solution has good cycle stability and good regeneration performance, and has potential application value.

Key words: carbon dioxide, coal-fired power plant, CO₂ absorbent, N-aminoethyl piperazine, sodium glycine, citric acid

中图分类号:

TK 01

汪丽, 张欢, 叶舣, 赵兴雷. N-氨乙基哌嗪与甘氨酸钠CO₂吸收剂配方研究[J]. 发电技术, 2023, 44(5): 674-684.

Li WANG, Huan ZHANG, Yi YE, Xinglei ZHAO. Formulation Study of N-Aminoethyl Piperazine and Sodium Glycine CO₂ Absorbent[J]. Power Generation Technology, 2023, 44(5): 674-684.

图/表 13

图1 CO2吸收实验装置示意图A—CO2气瓶；B—排气口阀门；C、F—阀门；D—气体流量控制器；E—气体流量显示仪；G—温度计；H—烧杯；I—磁力加热搅拌器。

Fig. 1 Schematic diagram of CO2 absorption experimental device

图2 CO2解吸实验装置示意图A—超级恒温油浴锅；B—热电偶；C—三口烧瓶；D—冷凝管；E—铁架台；F—注射器；G—无水变色硅胶；H—滴定管；I—去离子水。

Fig. 2 Schematic diagram of CO2 desorption experimental device

图3 AEP+SG复配溶液吸收量随时间变化关系

Fig. 3 Relationship between absorption capacity of AEP+SG complex solution and time

图4 AEP+SG复配溶液初次吸收速率随时间变化关系

Fig. 4 Relationship between absorption rate of AEP+SG complex solution and time

图5 AEP+SG复配溶液解吸量随时间变化关系

Fig. 5 Relationship between desorption capacity of AEP+SG complex solution and time

图6 AEP+SG复配溶液解吸速率随时间变化关系

Fig. 6 Relationship between desorption rate of AEP+SG complex solution and time

图7 AEP+SG复配溶液吸收/解吸对比图

Fig. 7 Absorption/desorption comparison diagram of AEP+SG complex solution

图8 35%AEP+5%SG复配溶液加入不同助剂解吸量随时间变化关系

Fig. 8 Relationship between desorption capacity of 35%AEP+5%SG complex solution with different additives and time

图9 35%AEP+5%SG复配溶液加入不同助剂解吸速率随时间变化关系

Fig. 9 Relationship between desorption rate of 35%AEP+5%SG complex solution with different additives and time

图10 35%AEP+5%SG复配溶液加入不同助剂吸收/解吸量对比图

Fig. 10 Contrast diagram of absorption and desorption capacity of 35%AEP+5%SG complex solution with different additives

图11 35% AEP+5% SG+1%柠檬酸复配溶液循环吸收/解吸量对比图

Fig. 11 Contrast diagram of cyclic absorption and desorption capacity of 35%AEP+5%SG+1% citric acid complex solution

图12 35% AEP+5% SG+1%柠檬酸复配溶液不同气体环境下循环吸收/解吸对比图

Fig. 12 Comparison diagram of cyclic absorption/desorption of 35%AEP+5%SG+1% citric acid complex solution in different gas environments

表1 再生能耗数据

Fig. 1 Calculation data of regeneration energy consumption

能耗	30%MEA	35%AEP+5% SG+1%柠檬酸
Q_rea/kJ	10.50	22.98
Q_hea/kJ	15.21	34.46
Q_eav/kJ	10.53	15.38
总能耗Q/kJ	37.24	72.82
单位能耗q/(kJ/mol)	206.87	136.75

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N-氨乙基哌嗪与甘氨酸钠CO₂吸收剂配方研究

Formulation Study of N-Aminoethyl Piperazine and Sodium Glycine CO₂ Absorbent

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