Aspen Plus模拟高浓度H2S/CO2酸性气的选择性分离

doi:10.11949/0438-1157.20200441

化工学报 ›› 2021, Vol. 72 ›› Issue (S1): 413-420.DOI: 10.11949/0438-1157.20200441

Aspen Plus模拟高浓度H₂S/CO₂酸性气的选择性分离

高帅涛¹(),刘雪珂¹,张丽¹,刘芬¹,余江¹(),商剑锋²,欧天雄²,周政³,陈平文³

^1.北京化工大学化学工程学院，能源环境催化北京市重点试验室环境催化与分离过程研究组，北京 100029
^2.中国石油化工有限公司普光分公司天然气技术管理部，四川达州 635000
^3.中国石油化工有限公司中原油田分公司天然气处理厂，河南濮阳 457000

收稿日期:2020-04-29 修回日期:2020-10-06 出版日期:2021-06-20 发布日期:2021-06-20
通讯作者: 余江
作者简介:高帅涛（1994—），男，硕士研究生，2017310010@buct.edu.cn
基金资助:
国家科技部“十三五”重大专项项目(2016ZX05017-004)

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

GAO Shuaitao¹(),LIU Xueke¹,ZHANG Li¹,LIU Fen¹,YU Jiang¹(),SHANG Jianfeng²,OU Tianxiong²,ZHOU Zheng³,CHEN Pingwen³

^1.Research Group of Environmental Catalysis & Separation Process, College of Chemical Engineering, Beijing University of Chemical Technology, Beijing 100029, China
^2.Natural Gas Technology Management Department of Puguang Branch of Sinopec, Dazhou 635000, Sichuan, China
^3.Natural Gas Treatment Plant of Zhongyuan Oilfield Branch of Sinopec, Puyang 457000, Henan, China

Received:2020-04-29 Revised:2020-10-06 Online:2021-06-20 Published:2021-06-20
Contact: YU Jiang

摘要/Abstract

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

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

中图分类号:

TQ 028.1

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.

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.

图/表 13

表1 某工厂煤制氢尾气组分

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

图1 流程模拟

Fig.1 Flowsheet simulation diagram

图2 溶解度模拟流程

Fig.2 Flowsheet of solubility simulation

图3 拟合得到的在不同压力下的溶解度曲线

Fig.3 Solubility curve under different pressures obtained by fitting

图4 一级闪蒸条件与二级闪蒸尾气H2S摩尔分数的关系

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

图5 吸收剂条件与H2S摩尔分数的关系

Fig.5 Relationship between absorbent condition and H2S molar fraction

图6 吸收塔条件与H2S摩尔分数的关系

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

图7 二级闪蒸温度与H2S摩尔分数的关系

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

图8 吸收剂条件与相应组分摩尔分数关系

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

图9 CO2吸收塔条件与相应组分摩尔分数关系

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

图10 分流器流量与二级闪蒸尾气H2S摩尔分数关系

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

图11 CO2闪蒸温度与贫液中CO2的摩尔分数关系

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

表2 模拟优化结果

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

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Aspen Plus模拟高浓度H₂S/CO₂酸性气的选择性分离

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

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