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

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

Abstract

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

CLC Number:

TK 01

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.

Figures/Tables 13

Fig. 1 Schematic diagram of CO2 absorption experimental device

Fig. 2 Schematic diagram of CO2 desorption experimental device

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

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

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

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

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

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

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

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

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

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

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

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