High-gravity intensified decarburization process and apparent kinetics of AMP-PZ composite solution

doi:10.16085/j.issn.1000-6613.2021-2502

Abstract

Abstract:

To improve the efficiency and rate of absorption process of thermal power plant for CO₂ removal using ethanolamine (MEA), the high-gravity intensification technology was applied and coupled with 2-amino-2-methyl-1-propanol and piperazine (AMP-PZ) to absorb CO₂ in waste gas. The results of orthogonal test showed that the significance of different operating parameters on the CO₂ removal efficiency was in order from high to low as follows: high-gravity factor, gas-liquid ratio, absorbent mass concentration, main absorbent content and temperature. The optimal operating parameters were obtained with the high-gravity factor of 60, gas-liquid ratio of 15, absorbent mass concentration of 25%, and main absorbent content of 60%, under which the CO₂ removal efficiency could reach 97.16%. Compared with the results of conventional absorption tower process with ethanolamine (MEA), the CO₂ removal efficiency increased by 7.16%. The reaction rate constant for CO₂ removal was two times that of aeration reaction equipment. A kinetic model of CO₂ absorption by a blend of AMP-PZ was established in high gravity field.

Key words: AMP, PZ, carbon dioxide, high-gravity, mass transfer, orthogonal test, absorption kinetic model

摘要：

为提高工业上火电厂乙醇胺（MEA）吸收塔脱碳工艺中脱碳率和反应速率，提出了超重力技术耦合2-氨基-2-甲基-1-丙醇-对二氮己环（AMP-PZ）混合胺脱碳方法。正交实验表明：不同操作参数对脱碳率的影响显著性大小依次为：超重力因子、气液比、吸收剂质量浓度、主吸收剂含量、温度；最佳操作条件为：超重力因子为60，气液比为15，吸收剂质量分数为25%，主吸收剂质量分数为60%，温度为25℃，CO₂脱除率可达97.16%。相对传统的乙醇胺（MEA）吸收塔法，CO₂脱除率提高了7.16%。相同操作条件下，旋转填料床的脱碳反应速率常数比曝气反应装置高一倍。建立了超重力场中AMP-PZ脱碳表观动力学模型，不同操作参数对反应速率常数的显著性影响大小依次为：超重力因子>气液比>吸收剂质量浓度。

关键词: 2-氨基-2-甲基-1-丙醇, 对二氮己环, 二氧化碳, 超重力, 传质, 正交试验, 表观动力学

CLC Number:

X701

LI Xiuping, YU Yang, HE Wang, LYU Junhui. High-gravity intensified decarburization process and apparent kinetics of AMP-PZ composite solution[J]. Chemical Industry and Engineering Progress, 2022, 41(S1): 22-28.

栗秀萍, 于洋, 何旺, 吕俊辉. 超重力强化AMP-PZ复合溶液脱碳技术及表观动力学[J]. 化工进展, 2022, 41(S1): 22-28.

Figures/Tables 13

References 17

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参数	因素
参数	1：超重力因子	2：气液比	3：吸收剂质量分数/%	4：温度/℃	5：主吸收剂质量分数/%	6	7	8：脱碳率/%
试验1	1	1	1	1	1	1	1	88.6
试验2	1	2	2	2	2	2	2	85.3
试验3	1	3	3	3	3	3	3	81.4
试验4	2	1	1	2	2	3	3	95.4
试验5	2	2	2	3	3	1	1	93.1
试验6	2	3	3	1	1	2	3	92.2
试验7	3	1	2	1	3	2	3	89.3
试验8	3	2	3	2	1	3	1	81.8
试验9	3	3	1	3	2	1	2	82.1
试验10	1	1	3	3	2	2	1	89.3
试验11	1	2	1	1	3	3	2	81.9
试验12	1	3	2	2	1	1	3	83.1
试验13	2	1	2	3	1	3	2	95.8
试验14	2	2	3	1	2	1	3	92.6
试验15	2	3	1	2	3	2	1	91.9
试验16	3	1	3	2	3	1	2	87.9
试验17	3	2	1	3	1	2	3	82.0
试验18	3	3	2	1	2	3	1	82.3
均值1	84.933	91.050	86.983	87.817	87.250	87.900	87.833
均值2	93.500	86.117	88.150	87.567	87.833	88.333	87.533
均值3	84.233	85.500	87.533	87.283	87.583	86.433	87.300
极差	9.267	5.550	1.167	0.534	0.583	1.900	0.533

参数	因素
参数	1：超重力因子	2：气液比	3：吸收剂质量分数/%	4：温度/℃	5：主吸收剂质量分数/%	6	7	8：脱碳率/%
试验1	1	1	1	1	1	1	1	88.6
试验2	1	2	2	2	2	2	2	85.3
试验3	1	3	3	3	3	3	3	81.4
试验4	2	1	1	2	2	3	3	95.4
试验5	2	2	2	3	3	1	1	93.1
试验6	2	3	3	1	1	2	3	92.2
试验7	3	1	2	1	3	2	3	89.3
试验8	3	2	3	2	1	3	1	81.8
试验9	3	3	1	3	2	1	2	82.1
试验10	1	1	3	3	2	2	1	89.3
试验11	1	2	1	1	3	3	2	81.9
试验12	1	3	2	2	1	1	3	83.1
试验13	2	1	2	3	1	3	2	95.8
试验14	2	2	3	1	2	1	3	92.6
试验15	2	3	1	2	3	2	1	91.9
试验16	3	1	3	2	3	1	2	87.9
试验17	3	2	1	3	1	2	3	82.0
试验18	3	3	2	1	2	3	1	82.3
均值1	84.933	91.050	86.983	87.817	87.250	87.900	87.833
均值2	93.500	86.117	88.150	87.567	87.833	88.333	87.533
均值3	84.233	85.500	87.533	87.283	87.583	86.433	87.300
极差	9.267	5.550	1.167	0.534	0.583	1.900	0.533

因素	偏差平方和	自由度	F比	F临界值	显著性
超重力因子	319.498	2	50.094	6.940	**
气液比	111.041	2	17.410	6.940	*
吸收剂质量浓度	4.088	2	0.641	6.940
温度	0.854	2	0.134	6.940
主吸收剂含量	1.028	2	0.161	6.940
误差	12.76	4

因素	偏差平方和	自由度	F比	F临界值	显著性
超重力因子	319.498	2	50.094	6.940	**
气液比	111.041	2	17.410	6.940	*
吸收剂质量浓度	4.088	2	0.641	6.940
温度	0.854	2	0.134	6.940
主吸收剂含量	1.028	2	0.161	6.940
误差	12.76	4

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