二元复合溶液脱除烟气中CO2 的过程模拟与评价

doi:10.16085/j.issn.1000-6613.2018-1089

摘要/Abstract

摘要：

为探究吸收容量大、再生能力较强的吸收剂复合吸收燃烧烟气中CO₂的性能，采用N-甲基二乙醇胺-哌嗪（MDEA-PZ）、碳酸钾-哌嗪（K₂CO₃-PZ）以及氨水-哌嗪（NH₃-PZ）3种二元复合溶液，基于Rate-based模型对其进行脱碳性能过程模拟。以吸收剂的摩尔流量、温度以及摩尔分数配比（X∶PZ）3个因素进行单因素研究，并在此基础上采用正交试验的方法得出最佳工艺方案。结果表明，随着吸收剂的摩尔流量上升、温度下降以及吸收剂中PZ摩尔分数上升，CO₂吸收效率呈上升趋势。在最佳工艺方案中，K₂CO₃-PZ二元复合溶液最佳吸收温度为40℃，MDEA-PZ和NH₃-PZ两种二元复合溶液最佳吸收温度为30℃；3种二元复合溶液最佳摩尔流量为3.5×10⁵kmol/h，最佳摩尔分数配比为60%∶40%。在各自最佳工艺以及其他条件相同的情况下，吸收CO₂性能的优劣依次为MDEA-PZ、NH₃-PZ以及K₂CO₃-PZ。

关键词: 烟道气, 二氧化碳捕集, Rate-based模型, 二元混合物, 化学吸收

Abstract:

To investigate the performance of the absorbents with high absorption capacity and strong regenerative capacity to compound absorbing CO₂ in the combustion flue gas, three binary compound solutions of methyldiethanolamine-piperazine (MDEA-PZ), potassium carbonate-piperazine (K₂CO₃-PZ) and ammonia-piperazine (NH₃-PZ) were selected. Based on the Rate-based model, the decarburization performance process simulations were conducted. The effect of three factors of absorbent, including molar flow rate, temperature and molar concentration ratio (X∶PZ), were studied by single-factor method. On this basic, the optimal process conditions were obtained by orthogonal test method. The result showed that, as the molar flow rate of the absorbent increases, the temperature of the absorbent decreases, and the PZ molar concentration in the absorbent increases, the CO₂ absorption efficiency increases. Under the optimal process conditions, the optimal absorption temperature of the K₂CO₃-PZ binary compound solution is 40°C. The optimal absorption temperature of the binary compound solution of MDEA-PZ and NH₃-PZ is 30°C. The optimal molar flow rate of the three binary compound solutions is 3.5×10⁵kmol/h, and the optimal molar concentration ratio is 60%∶40%. Under each optimal process conditions and other same conditions, the order of CO₂ absorption performance is MDEA-PZ>NH₃-PZ>K₂CO₃-PZ.

Key words: flue gas, CO₂ capture, Rate-based model, binary mixture, chemical absorption

中图分类号:

TQ03-39

方童波,赵兵涛,王大淇,苏亚欣. 二元复合溶液脱除烟气中CO₂ 的过程模拟与评价[J]. 化工进展, 2019, 38(03): 1561-1566.

Tongbo FANG,Bingtao ZHAO,Daqi WANG,Yaxin SU. Process simulation and evaluation of CO₂ removal from flue gas by binary compound solutions[J]. Chemical Industry and Engineering Progress, 2019, 38(03): 1561-1566.

图/表 10

参考文献 21

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烟气参数	数值	吸收剂参数	数值
流量/kmol·h^－1	69738.9	流量/kmol·h^-1	250000
压力/MPa	0.1	压力/MPa	0.12
温度/℃	57.8	温度/℃	40
CO₂体积分数/%	12.8	总摩尔浓度/mol·L^-1	2
O₂体积分数/%	2.9	摩尔分数配比	90%∶10%
N₂体积分数/%	68.3	CO₂负荷/molCO₂·(mol吸附剂^-1)	0.1
H₂O体积分数/%	16

烟气参数	数值	吸收剂参数	数值
流量/kmol·h^－1	69738.9	流量/kmol·h^-1	250000
压力/MPa	0.1	压力/MPa	0.12
温度/℃	57.8	温度/℃	40
CO₂体积分数/%	12.8	总摩尔浓度/mol·L^-1	2
O₂体积分数/%	2.9	摩尔分数配比	90%∶10%
N₂体积分数/%	68.3	CO₂负荷/molCO₂·(mol吸附剂^-1)	0.1
H₂O体积分数/%	16

水平	因素
水平	温度A/℃	摩尔流量B/kmol·h^－1	摩尔分数C配比
1	30	2.0×10⁵	60%∶40%
2	40	2.5×10⁵	70%∶30%
3	50	3.0×10⁵	80%∶20%
4	60	3.5×10⁵	90%∶10%

水平	因素
水平	温度A/℃	摩尔流量B/kmol·h^－1	摩尔分数C配比
1	30	2.0×10⁵	60%∶40%
2	40	2.5×10⁵	70%∶30%
3	50	3.0×10⁵	80%∶20%
4	60	3.5×10⁵	90%∶10%

参数	K₂CO₃-PZ二元复合溶液			MDEA-PZ二元复合溶液			NH₃-PZ二元复合溶液
参数	A	B	C	A	B	C	A	B	C
K ₁	254.1	195.9	257.7	277.0	200.5	271.0	238.2	156.3	232.9
K ₂	254.1	235.5	254.3	248.9	230.9	256.3	220.8	193.4	218.1
K ₃	251.9	272.6	250.6	229.0	257.8	232.5	199.0	227.3	199.3
K ₄	250.8	306.8	248.3	219	284.8	214.2	179.4	260.4	187.1
k ₁	63.51	48.99	64.42	69.24	50.1	67.74	59.55	39.07	58.23
k ₂	63.53	58.88	63.58	62.24	57.72	64.08	55.21	48.36	54.53
k ₃	62.97	68.14	62.65	57.25	64.45	58.12	49.76	56.81	49.83
k ₄	62.7	76.7	62.07	54.75	71.19	53.54	44.84	65.11	46.77
极差	0.833	27.713	2.348	14.493	21.07	14.203	14.705	26.038	11.463

二元复合溶液脱除烟气中CO₂ 的过程模拟与评价

Process simulation and evaluation of CO₂ removal from flue gas by binary compound solutions

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