增强流体扰动强化变压吸附甲硫醚/氮气分离的数值模拟

doi:10.16085/j.issn.1000-6613.2023-0431

化工进展 ›› 2023, Vol. 42 ›› Issue (S1): 64-72.DOI: 10.16085/j.issn.1000-6613.2023-0431

增强流体扰动强化变压吸附甲硫醚/氮气分离的数值模拟

郭强¹^,²(), 赵文凯¹, 肖永厚²^,³()

^1.沈阳工业大学石油化工学院，辽宁辽阳 111003
^2.大连理工大学盘锦产业技术研究院，辽宁盘锦 124221
^3.大连理工大学石油与化学工程学院，辽宁盘锦 124221

收稿日期:2023-03-22 修回日期:2023-07-09 出版日期:2023-10-25 发布日期:2023-11-30
通讯作者: 肖永厚
作者简介:郭强（1998—），男，硕士研究生，研究方向为气体吸附分离。E-mail：guoqiang202103@163.com。
基金资助:
中央引导地方科技发展资金(2022JH6/100100050);国家自然科学基金(21776028);辽宁省化学助剂合成与分离重点实验室开放课题重点项目(ZJKF2001)

Numerical simulation of enhancing fluid perturbation to improve separation of dimethyl sulfide/nitrogen via pressure swing adsorption

GUO Qiang¹^,²(), ZHAO Wenkai¹, XIAO Yonghou²^,³()

^1.School of Petrochemical Engineering, Shenyang University of Technology, Liaoyang 111003, Liaoning, China
^2.Panjin Industrial Technology Institute, Dalian University of technology, Panjin 124221, Liaoning, China
^3.Dalian University of technology, Panjin 124221, Liaoning, China

Received:2023-03-22 Revised:2023-07-09 Online:2023-10-25 Published:2023-11-30
Contact: XIAO Yonghou

摘要/Abstract

摘要：

变压吸附（PSA）是一个多步骤耦合的周期性循环动态过程，吸附床层中流体的流动状态对分离效率的影响规律尚不明确，深入探究不同流动状态下吸附床内流体的浓度场分布，对提高分离效率具有重要指导意义。本文基于Aspen Adsorption V12模拟平台，建立了一个描述多组分吸附、混合气体流动传质的四床九步扰动PSA模型，模拟甲硫醚/氮气分离，考察吸附床内流动相由层流向湍流过渡过程中湍动程度对分离效果的影响。结果表明，当雷诺数在800~1200范围内，增强流动相湍动程度可以有效提高分离性能。当PSA吸附过程中流动相由过渡流转变为完全湍流状态时，以甲硫醚含量2000μL/L的氮气为原料，产品气中甲硫醚从20μL/L脱除至8μL/L，氮气收率由93.3%降至86.9%。本研究表明，在一定范围内增强湍动有利于提高分离效果，但流速过高会造成吸附剂流化，从而失去有效的吸附分离能力。因此，PSA工艺实际应用中应综合考虑系统的湍动影响，强化分离效果。

关键词: 变压吸附, 数值模拟, 增强扰动, 甲硫醚吸附分离

Abstract:

Pressure swing adsorption (PSA) is a multi-step coupled periodic cycle dynamic process, and the effect of the flow state of the fluid in the adsorption bed on the separation efficiency has not been clarified yet. It is of great guiding significance to deeply explore the concentration field distribution of the fluid in the adsorption bed under different flow conditions through numerical simulation, in order to enhance separation efficiency. In this work, based on Aspen Adsorption V12 a four-bed, nine-step PSA model was established to simulate the separation of dimethyl sulfide /nitrogen, and the effect of the degree of turbulence on the separation efficiency was investigated during the transition process of the mobile phase from layer to turbulence in the adsorption bed. The results showed that when the Reynolds number was in the range of 800—1200, enhanced mobile phase turbulence could effectively improve the separation performance. When the mobile phase changed from transition flow to complete turbulence during PSA adsorption, the dimethyl sulfide was removed from 20μL/L to 8μL/L with the dimethyl sulfide content of 2000μL/L as raw material, and the nitrogen yield decreased from 93.3% to 86.9%. The research results indicated that enhancing turbulence within a certain range should be beneficial to improving the separation efficiency, but excessive flow rates could cause the adsorbent to fluidize, thereby losing effective adsorption and separation capabilities. Therefore, regarding the practical application of PSA process, the turbulence impact on the system should be comprehensively accounted to enhance the separation efficiency.

Key words: pressure swing adsorption, numerical simulation, enhancing fluid perturbation, separation of dimethyl sulfide via adsorption

中图分类号:

TQ028.1

郭强, 赵文凯, 肖永厚. 增强流体扰动强化变压吸附甲硫醚/氮气分离的数值模拟[J]. 化工进展, 2023, 42(S1): 64-72.

GUO Qiang, ZHAO Wenkai, XIAO Yonghou. Numerical simulation of enhancing fluid perturbation to improve separation of dimethyl sulfide/nitrogen via pressure swing adsorption[J]. Chemical Industry and Engineering Progress, 2023, 42(S1): 64-72.

图/表 12

参考文献 29

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等温线参数	甲硫醚	氮气
IP1/kmol·kg^-1 bar^-1	0.0049	0.000239
IP2/bar^-1	0.03149	0.76283
DH/kJ·mol^-1	-26.04	-14.3

等温线参数	甲硫醚	氮气
IP1/kmol·kg^-1 bar^-1	0.0049	0.000239
IP2/bar^-1	0.03149	0.76283
DH/kJ·mol^-1	-26.04	-14.3

物性参数	值
吸附床高度/m	1.5
吸附床壁厚/m	0.001
吸附剂堆密度/kg·m^-3	670
粒径/mm	1.5~3
吸附床罐壁密度/kg·m^-3	7800
气相与固相换热系数/W·m^-2·K^-1	10
吸附床罐壁比热容/kJ·kg^-1·K^-1	0.502
环境温度/K	298.15

物性参数	值
吸附床高度/m	1.5
吸附床壁厚/m	0.001
吸附剂堆密度/kg·m^-3	670
粒径/mm	1.5~3
吸附床罐壁密度/kg·m^-3	7800
气相与固相换热系数/W·m^-2·K^-1	10
吸附床罐壁比热容/kJ·kg^-1·K^-1	0.502
环境温度/K	298.15

时间/s	150			50	50	50	50	50	50	50	100
吸附床1	AD			ED1	ID	ED2	BD	PU	ER2	ER1	PR
吸附床2	ER1	PR		AD			ED1	ID	ED2	BD	PU	ER2
吸附床3	BD	PU	ER2	ER1	PR		AD			ED1	ID	ED2
吸附床4	ED1	ID	ED2	BD	PU	ER2	ER1	PR		AD

增强流体扰动强化变压吸附甲硫醚/氮气分离的数值模拟

Numerical simulation of enhancing fluid perturbation to improve separation of dimethyl sulfide/nitrogen via pressure swing adsorption

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图/表 12

参考文献 29

相关文章 15

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Metrics

本文评价

模拟	压力	粒径	吹扫比	雷诺数	甲硫醚/μL·L^-1	收率/%
1	4	3.5	0.23	1030	<50	90.1
2	5	2.8	0.23	830	<30	84.9
3	5	3.5	0.16	950	<20	91.1
4	6	3.5	0.23	1070	<8	86.9
5	5	3.5	0.06	840	<50	95.4
6	4	3.5	0.01	805	<400	97.1
7	5	3.5	0.07	865	<30	94.6
8	5	3.5	0.11	895	<20	93.3
9	5	3.5	0.23	1037	<15	88.3
10	6	3.4	0.11	845	<15	92.4
11	6	3.4	0.07	813	<15	93.6
12	4	3.5	0.16	912	<50	92.1
13	6	1.5	0.23	453	<15	87.3
14	4	3.5	0.06	844	<100	95.4
15	6	2	0.16	608	<30	90.1
16	6	3	0.07	751	<15	93.6
17	6	3	0.23	914	<10	87.0
18	4	3.5	0.07	855	<100	95.2
19	6	2.8	0.23	852	<15	87.1
20	6	3.2	0.23	1017	<10	86.9
21	6	3.5	0.16	965	<10	90.4

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