Aspen Plus simulation on selective separation of high concentration acid gas of H2S and CO2

doi:10.11949/0438-1157.20200441

Abstract

Abstract:

In this paper, polyethylene glycol dimethyl ether (NHD) was used as absorbent to treat the tail gas with high concentration of H₂S and CO₂ from the coal to hydrogen process. The solubility parameters of H₂S and CO₂ in NHD were fitted with the PC-SAFT equation of state. A two-stage absorptive separation process was built with the application of Aspen Plus process simulation software to realize the high effective separation of H₂S and CO₂. The results show that the concentration of the separated H₂S and CO₂ could be reached from 30% to 98.7% and 55% to 99.4%, respectively. Hence, the acid gas pollution control can be done by high efficient separation of H₂S and CO₂ to get high single concentration for reuse and resource.

Key words: carbon dioxide, hydrogen sulfide, absorption separation, Aspen simulation, polyethylene glycol dimethyl ether

摘要：

以煤制氢尾气中的高浓度酸性气体H₂S和CO₂为对象，以聚乙二醇二甲醚（NHD）为吸收剂，使用PC-SAFT状态方程拟合了酸性气体CO₂和H₂S在聚乙二醇二甲醚（NHD）溶剂中溶解参数，运用Aspen Plus流程模拟软件，构建两级吸收分离工艺，实现H₂S和CO₂的高效分离，H₂S浓度由30%提升至98.7%，CO₂含量由55%提升至99.4%。由此，可以通过高效分离酸性气H₂S和CO₂，并以提浓后再资源化利用的方式实现酸性气的污染控制。

关键词: 二氧化碳, 硫化氢, 吸收分离, Aspen模拟, 聚乙二醇二甲醚

CLC Number:

TQ 028.1

GAO Shuaitao, LIU Xueke, ZHANG Li, LIU Fen, YU Jiang, SHANG Jianfeng, OU Tianxiong, ZHOU Zheng, CHEN Pingwen. Aspen Plus simulation on selective separation of high concentration acid gas of H₂S and CO₂[J]. CIESC Journal, 2021, 72(S1): 413-420.

高帅涛, 刘雪珂, 张丽, 刘芬, 余江, 商剑锋, 欧天雄, 周政, 陈平文. Aspen Plus模拟高浓度H₂S/CO₂酸性气的选择性分离[J]. 化工学报, 2021, 72(S1): 413-420.

Figures/Tables 13

Table 1 Tail gas components from coal to hydrogen in a factory

组分	摩尔分数/%
CO₂	54.97
N₂	12.93
H₂S	31.38
其他	0.72

Fig.1 Flowsheet simulation diagram

Fig.2 Flowsheet of solubility simulation

Fig.3 Solubility curve under different pressures obtained by fitting

Fig.4 Relationship between first-stage flash conditions and H2S molar fraction of second-stage flash gas

Fig.5 Relationship between absorbent condition and H2S molar fraction

Fig.6 Relationship between absorption tower conditions and H2S molar fraction

Fig.7 Relationship between secondary flash temperature and H2S molar fraction

Fig.8 Relationship between conditions of absorbent and molar fraction of corresponding components

Fig.9 Relationship between conditions of CO2 absorption tower and molar fraction of corresponding components

Fig.10 Relationship between flow rate of splitter and H2S molar fraction of secondary flash tail gas

Fig.11 Relationship between CO2 flash temperature and molar fraction of CO2 in lean liquid

Table 2 Optimization results of simulation

项目	原料气	H₂S吸收塔进气	H₂S吸收塔尾气	吸收塔尾气	CO₂尾气	H₂S尾气	CO₂贫液	H₂S贫液
T/℃	38	20	19.51	16.2	25	25	48.5	67.7
p/MPa	0.2	1	0.4	0.4	0.001	0.001	0.001	0.001
摩尔流量/(kmol/h)	46.78	101	47.1	6.911	25.62	14.10	230	130.109
分摩尔流量/(kmol/h)
NHD		<0.001	trace	trace	0.002	0.001	230	129.999
CO₂	25.73	30	40	0.001	25.51	0.18	0.04	<0.001
N₂	7.017	7.04	7.08	6.91	0.107	<0.001	trace	trace
H₂S	14.03	64.3	0	trace	0.002	13.922	<0.001	0.11
摩尔分数
NHD		402×10^-9	118×10^-9	70×10^-9	84×10^-6	84×10^-6	1	0.999
CO₂	0.55	0.3	0.85	149×10^-6	0.996	0.013	181×10^-6	2×10^-6
N₂	0.15	0.07	0.15	1	0.004	954×10^-9	12×10^-9	trace
H₂S	0.3	0.63	58×10^-6	trace	67×10^-6	0.987	86×10^-9	846×10^-6

References 24

1	Mirfendereski S M, Niazi Z, Mohammadi T. Selective removal of H₂S from gas streams with high CO₂ concentration using hollow-fiber membrane contractors [J]. Chemical Engineering & Technology, 2019, 42(1): 196-208.
2	Afsharpour A, Haghtalab A. Simultaneous measurement absorption of CO₂ and H₂S mixture into aqueous solutions containing Diisopropanolamine blended with 1-butyl-3-methylimidazolium acetate ionic liquid [J]. International Journal of Greenhouse Gas Control, 2017, 58: 71-80.
3	吴振中, 李发永, 曹作刚. 含高浓度H₂S炼厂酸性气体处理新工艺[J]. 石油化工高等学校学报, 2005, 18(4): 12-15.
	Wu Z Z, Li F Y, Cao Z G. New process for treating high concentrated H₂S refinery acidic gas [J]. Journal of Petrochemical Universities, 2005, 18(4): 12-15.
4	Li Y, Huang W J, Zheng D X, et al. Solubilities of CO₂ capture absorbents 2-ethoxyethyl ether, 2-butoxyethyl acetate and 2-(2-ethoxyethoxy)ethyl acetate [J]. Fluid Phase Equilibria, 2014, 370: 1-7.
5	Madeddu C, Errico M, Baratti R. Solvent recovery system for a CO₂-MEA reactive absorption-stripping plant [J]. Chemical Engineering Transactions, 2019, 74: 805-810.
6	Shiflett M B, Niehaus A M S, Yokozeki A. Separation of CO₂ and H₂S using room-temperature ionic liquid [bmim][MeSO₄] [J]. Journal of Chemical & Engineering Data, 2010, 55(11): 4785-4793.
7	孟艳芳. 常见煤制气中的酸性气体脱除工艺技术特性对比与选择[J]. 山西能源学院学报, 2017, 30(3): 89-90, 94.
	Meng Y F. Comparison and selection of technical characteristics of acid gas removal in common coal gasification [J]. Journal of Shanxi Institute of Energy, 2017, 30(3): 89-90, 94.
8	陈昌介, 何金龙, 温崇荣. 高含硫天然气净化技术现状及研究方向[J]. 天然气工业, 2013, 33(1): 112-115.
	Chen C J, He J L, Wen C R. A state of the art of high-sulfur natural gas sweetening technology and its research direction [J]. Natural Gas Industry, 2013, 33(1): 112-115.
9	Ma C Y, Liu C, Lu X H, et al. Techno-economic analysis and performance comparison of aqueous deep eutectic solvent and other physical absorbents for biogas upgrading [J]. Applied Energy, 2018, 225: 437-447.
10	Yang S, Qian Y, Yang S Y. Development of a full CO₂ capture process based on the rectisol wash technology [J]. Industrial & Engineering Chemistry Research, 2016, 55(21): 6186-6193.
11	赵鹏飞, 李水弟, 王立志. 低温甲醇洗技术及其在煤化工中的应用[J]. 化工进展, 2012, 31(11): 2442-2448.
	Zhao P F, Li S D, Wang L Z. Rectisol technology and its application in coal chemical industry [J]. Chemical Industry and Engineering Progress, 2012, 31(11): 2442-2448.
12	李正西. NHD脱硫脱碳技术应用 [J]. 煤化工, 2004, 32(3): 53-57.
	Li Z X. Application of the NHD technology for desulfurization and decarbonization [J]. Coal Chemical Industry, 2004, 32(3): 53-57.
13	林民鸿. NHD气体净化技术理论与实践(上) [J]. 化肥工业, 2000, 27(4): 17-21.
	Lin M H. NHD gas purification technology: theory and practice (Ⅰ) [J]. Journal of the Chemical Fertilizer Industry, 2000, 27(4): 17-21.
14	Im D, Roh K, Kim J, et al. Economic assessment and optimization of the Selexol process with novel additives [J]. International Journal of Greenhouse Gas Control, 2015, 42: 109-116.
15	Ramzan N, Shakeel U, Güngör A, et al. Techno-economic analysis of selexol and sulfinol processes for pre-combustion CO₂ capture [C]// 2018 International Conference on Power Generation Systems and Renewable Energy Technologies (PGSRET). Islamabad, Pakistan, 2018: 1-6.
16	邱朋华, 李丹丹, 徐宝龙, 等. 基于Aspen Plus对Selexol分离CO₂流程的分析[J]. 中国电机工程学报, 2014, 34(8): 1231-1237.
	Qiu P H, Li D D, Xu B L, et al. Analysis of CO₂ separation by Selexol based on Aspen Plus [J]. Proceedings of the CSEE, 2014, 34(8): 1231-1237.
17	朱林, 艾珍, 王大军, 等. 使用N-甲酰吗啉和聚乙二醇二甲醚溶剂分离H₂S和CO₂流程模拟比较[J]. 化工学报, 2017, 68: 218-224.
	Zhu L, Ai Z, Wang D J, et al. Simulation and comparison of H₂S and CO₂ separation processes using N-formyl morpholine and polyethylene glycol dimethyl ether solvent [J]. CIESC Journal, 2017, 68: 218-224.
18	Mohammed I Y, Samah M, Sabina G, et al. Comparison of Selexol^TM and Rectisol^® technologies in an integrated gasification combined cycle (IGCC) plant for clean energy production [J]. International Journal of Engineering Research, 2014, 3(12): 742-744.
19	Kapetaki Z, Brandani P, Brandani S, et al. Process simulation of a dual-stage Selexol process for 95% carbon capture efficiency at an integrated gasification combined cycle power plant [J]. International Journal of Greenhouse Gas Control, 2015, 39: 17-26.
20	Bagchi B, Sati S, Shilapuram V. Modelling solubility of CO₂ and hydrocarbon gas mixture in ionic liquid ([emim][FAP]) using ASPEN Plus [J]. Journal of Molecular Liquids, 2016, 224: 30-42.
21	Wang Y L, Liu X B, Kraslawski A, et al. A novel process design for CO₂ capture and H₂S removal from the syngas using ionic liquid [J]. Journal of Cleaner Production, 2019, 213: 480-490.
22	霍月洋. 利用Aspen Plus计算气体物质的溶解度[J]. 浙江化工, 2015, 46(4): 48-50.
	Huo Y Y. Simulation and calculation for the solubility of gas by Aspen Plus [J]. Zhejiang Chemical Industry, 2015, 46(4): 48-50.
23	Xu Y M, Schutte R P, Hepler L G. Solubilities of carbon dioxide, hydrogen sulfide and sulfur dioxide in physical solvents [J]. The Canadian Journal of Chemical Engineering, 1992, 70(3): 569-573.
24	Ros J A, Brilman D W F, Bernhardsen I M, et al. Describing CO₂-Absorbent Properties in AspenPlus^® [M]// Computer Aided Chemical Engineering. Amsterdam: Elsevier, 2019: 1087-1092.

[1]	Yifei ZHANG, Fangchen LIU, Shuangxing ZHANG, Wenjing DU. Performance analysis of printed circuit heat exchanger for supercritical carbon dioxide [J]. CIESC Journal, 2023, 74(S1): 183-190.
[2]	Ruitao SONG, Pai WANG, Yunpeng WANG, Minxia LI, Chaobin DANG, Zhenguo CHEN, Huan TONG, Jiaqi ZHOU. Numerical simulation of flow boiling heat transfer in pipe arrays of carbon dioxide direct evaporation ice field [J]. CIESC Journal, 2023, 74(S1): 96-103.
[3]	Yepin CHENG, Daqing HU, Yisha XU, Huayan LIU, Hanfeng LU, Guokai CUI. Application of ionic liquid-based deep eutectic solvents for CO₂ conversion [J]. CIESC Journal, 2023, 74(9): 3640-3653.
[4]	Rui HONG, Baoqiang YUAN, Wenjing DU. Analysis on mechanism of heat transfer deterioration of supercritical carbon dioxide in vertical upward tube [J]. CIESC Journal, 2023, 74(8): 3309-3319.
[5]	Qiyu ZHANG, Lijun GAO, Yuhang SU, Xiaobo MA, Yicheng WANG, Yating ZHANG, Chao HU. Recent advances in carbon-based catalysts for electrochemical reduction of carbon dioxide [J]. CIESC Journal, 2023, 74(7): 2753-2772.
[6]	Caihong LIN, Li WANG, Yu WU, Peng LIU, Jiangfeng YANG, Jinping LI. Effect of alkali cations in zeolites on adsorption and separation of CO₂/N₂O [J]. CIESC Journal, 2023, 74(5): 2013-2021.
[7]	Chenxi LI, Yongfeng LIU, Lu ZHANG, Haifeng LIU, Jin’ou SONG, Xu HE. Quantum chemical analysis of n-heptane combustion mechanism under O₂/CO₂ atmosphere [J]. CIESC Journal, 2023, 74(5): 2157-2169.
[8]	Tianhao BAI, Xiaowen WANG, Mengzi YANG, Xinwei DUAN, Jie MI, Mengmeng WU. Study on release and inhibition behavior of COS during high-temperature gas desulfurization process using Zn-based oxide derived from hydrotalcite [J]. CIESC Journal, 2023, 74(4): 1772-1780.
[9]	Bingguo ZHU, Jixiang HE, Jinliang XU, Bin PENG. Heat transfer characteristics of supercritical pressure CO₂ in diverging/converging tube under cooling conditions [J]. CIESC Journal, 2023, 74(3): 1062-1072.
[10]	Renchu HE, Zhaohui ZHANG, Minglei YANG, Cong WANG, Zhenhao XI. Online optimization of gasoline blending considering carbon emissions [J]. CIESC Journal, 2023, 74(2): 818-829.
[11]	Chenyang SHEN, Kaihang SUN, Yueping ZHANG, Changjun LIU. Research progresses on In₂O₃ and In₂O₃ supported metal catalysts for CO₂ hydrogenation to methanol [J]. CIESC Journal, 2023, 74(1): 145-156.
[12]	Dan GUO, Yujie FANG, Yihan XU, Zhiyuan LI, Shouying HUANG, Shengping WANG, Xinbin MA. Research progress of the catalytic conversion of ethane and carbon dioxide [J]. CIESC Journal, 2022, 73(8): 3406-3416.
[13]	Wenhua DAI, Zhong XIN. Effect of Si-doped Cu/ZrO₂on the performance of catalysts for CO₂ hydrogenation to methanol [J]. CIESC Journal, 2022, 73(8): 3586-3596.
[14]	Wangxin GE, Yihua ZHU, Hongliang JIANG, Chunzhong LI. Research progress on electrolytes for carbon dioxide electroreduction [J]. CIESC Journal, 2022, 73(8): 3433-3447.
[15]	Jiaming WANG, Xuehua RUAN, Gaohong HE. Research progress of membrane separation materials for different industrial CO₂-containing mixtures [J]. CIESC Journal, 2022, 73(8): 3417-3432.

Aspen Plus simulation on selective separation of high concentration acid gas of H₂S and CO₂

Aspen Plus模拟高浓度H₂S/CO₂酸性气的选择性分离

RichHTML

PDF (PC)

Knowledge

Abstract

Cite this article

share this article

Figures/Tables 13

References 24

Related Articles 15

Recommended Articles

Metrics

Comments