基于Aspen Adsorption的氦气/甲烷吸附分离过程模拟优化

doi:10.11949/0438-1157.20181046

摘要/Abstract

摘要：

工业氦气主要通过深冷、膜分离和变压吸附（PSA）耦合从天然气提取，其中PSA是获得高纯He的关键。吸附过程模拟可以克服实验局限，有效指导工程设计、优化工艺条件。以体积分数90%的粗He为原料，利用Aspen Adsorption软件建立He/CH₄ 单塔PSA模型，获得穿透曲线。以此为基础，建立双塔分离流程，分析吸附、顺放、逆放、冲洗、升压步骤中吸附塔内气相组成的变化，五步最佳操作时间分别为 60、180、30、60和180 s。在三塔流程中，一个循环周期的最佳吸附时间和均压时间分别为135 s和90 s，产品纯度可达98.42%，回收率达60.45%。在五塔流程中，考虑到各步骤时间的匹配及生产的连续性，需要对一个周期内的循环时间进行优化。循环时间为300~340 s时，产品纯度达到99.07%以上。

关键词: 吸附, 氦气, 过程模拟, 优化

Abstract:

Industrial helium is mainly extracted from natural gas by cryogenic, membrane separation and pressure swing adsorption（PSA） coupling of which PSA is the key to obtain high purity helium. It is helpful to overcome experimental limitations via adsorption process simulation, which can effectively guide engineering design and optimize process conditions. A helium/methane single-column pressure swing adsorption model was established by Aspen Adsorption software to obtain breakthrough curves. Based on the results, a two-column PSA process was established. The optimal operation time of adsorption, forward, reverse, flush, and boost step is 60, 180, 30, 60 and 180 s, through analyzing the changes of the gas phase composition in the adsorption column. In three-column PSA process, the optimal time of adsorption and pressure equalization for one cycle are 135 s and 90 s, helium purity can reach 98.42% and the recovery is up to 60.45%. It is necessary to optimize the cycle time in one cycle by considering the matching of each step time and the continuity of production in five-tower PSA process. When cycle time is between 300 s and 340 s, purity of helium reaches 99.07%.

Key words: adsorption, helium, process simulation, optimization

中图分类号:

TQ 028.8

肖永厚, 肖红岩, 李本源, 秦剑亮, 邱爽, 贺高红. 基于Aspen Adsorption的氦气/甲烷吸附分离过程模拟优化[J]. 化工学报, 2019, 70(7): 2556-2563.

Yonghou XIAO, Hongyan XIAO, Benyuan LI, Jianliang QIN, Shuang QIU, Gaohong HE. Optimization of helium/methane adsorption separation process based on Aspen Adsorption simulation[J]. CIESC Journal, 2019, 70(7): 2556-2563.

图/表 14

参考文献 31

1	DasN K, KumarP, MallikC, et al. Development of a helium purification system using pressure swing adsorption[J]. Current Science, 2012, 103: 631-634.
2	AndersonS T. Economics, helium, and the US federal helium reserve: summary and outlook[J]. Natural Resources Research, 2018, 27(4): 455-477.
3	RuffordT E, ChanK I, HuangS H, et al. A review of conventional and emerging process technologies for the recovery of helium from natural gas[J]. Adsorption Science & Technology, 2014, 32(1): 49-72.
4	ZartmanR E, ReynoldsJ H, WasserburgG J. Helium, argon and carbon in some natural gases[J]. Journal of Geophysical Research, 1961, 66(1): 277-306.
5	SircarS. Pressure swing adsorption[J]. Ind. Eng. Chem. Res., 2002, 41: 1389-1392.
6	ScholesC A, GoshU K, HoM T. The economics of helium separation and purification by gas separation membranes[J]. Industrial & Engineering Chemistry Research, 2017, 56: 5014-5020.
7	LiB, HeG, JiangX, et al. Pressure swing adsorption/membrane hybrid processes for hydrogen purification with a high recovery[J]. Frontiers of Chemical Science and Engineering, 2016, 10: 255-264.
8	WesslingM, LopezM L, StrathmannH. Accelerated plasticization of thin-film composite membranes used in gas separation[J]. Separation and Purification Technology, 2001, 24: 223-233.
9	DasN K, ChaudhuriH, BhandariR K, et al. Purification of helium from natural gas by pressure swing adsorption[J]. Current Science, 2008, 95: 1684-1687.
10	GolmakaniA, FatemiS, TamnanlooJ. CO₂ capture from the tail gas of hydrogen purification unit by vacuum swing adsorption process, using SAPO-34[J]. Industrial & Engineering Chemistry Research, 2016, 55: 334-350.
11	邢国海. 天然气提取氦气技术现状与发展[J]. 天然气工业, 2008, 28(8): 114-116.
	XingG H. Status quo and development of the technology on helium gas abstracted from natural gas[J]. Natural Gas Industry, 2008, 28(8): 114-116.
12	AsgariM, AnisiH, MohammadiH, et al. Designing a commercial scale pressure swing adsorber for hydrogen purification[J]. Petroleum & Coal, 2014, 56 (5): 552-561.
13	AnisuzzamanS M, AwangB, KrishnaiahD, et al. A study on dynamic simulation of phenol adsorption in activated carbon packed bed column[J]. Journal of King Saud University - Engineering Sciences, 2016, 28: 47-55.
14	LiD D, ZhouY, ShenY H, et al. Experiment and simulation for separating CO₂/N₂ by dual-reflux pressure swing adsorption process[J]. Chemical Engineering Journal, 2016, 297: 315-324.
15	ThomasR J, DuttaR, GhoshP, et al. Applicability of equations of state for modeling helium systems[J]. Cryogenics, 2012, 52: 375-381.
16	XiaoJ S, PengY Z, BenardP, et al. Thermal effects on breakthrough curves of pressure swing adsorption for hydrogen purification[J]. International Journal of Hydrogen Energy, 2016, 41: 8236-8245.
17	阎海宇, 付强, 张东辉, 等. 真空变压吸附捕集烟道气中二氧化碳的模拟、实验及分析[J]. 化工学报, 2016, 67(6): 2371-2379.
	YanH Y, FuQ, ZhangD H, et al. Simulation, experimentation and analyzation of vacuum pressure swing adsorption process for CO₂ capture from dry flue gas[J]. CIESC Journal, 2016, 67(6): 2371-2379.
18	韩治洋, 丁兆阳, 张东辉, 等. 真空变压吸附分离氮气甲烷的模拟与控制[J]. 化工学报, 2018, 69(2): 750-758.
	HanZ Y, DingZ Y, ZhangD H, et al. Simulation and control of vacuum pressure swing adsorption for N₂/CH₄ separations[J]. CIESC Journal, 2018, 69(2): 750-758.
19	ShafeeyanM S, DaudW, ShamiriA. A review of mathematical modeling of fixed-bed columns for carbon dioxide adsorption[J]. Chemical Engineering Research & Design, 2014, 92: 961-988.
20	MendesA M M, CostaC A V, RodriguesA E. Oxygen separation from air by PSA: modelling and experimental results(Ⅰ): Isothermal operation[J]. Separation and Purification Technology, 2001, 24: 173-188.
21	DantasT L P, LunaF M T, SilvaI J, et al. Carbon dioxide-nitrogen separation through pressure swing adsorption[J]. Chemical Engineering Journal, 2011, 172: 698-704.
22	ChahbaniM H, TondeurD. Mass transfer kinetics in pressure swing adsorption[J]. Separation and Purification Technology, 2000, 20: 185-196.
23	JeeJ G, KimM B, LeeC H. Pressure swing adsorption processes to purify oxygen using a carbon molecular sieve[J]. Chemical Engineering Science, 2005, 60: 869-882.
24	WonW, LeeS, LeeK S. Modeling and parameter estimation for a fixed-bed adsorption process for CO₂ capture using zeolite 13X[J]. Separation and Purification Technology, 2012, 85: 120-129.
25	CavenatiS, GrandeC A, RodriguesA E. Adsorption equilibrium of methane, carbon dioxide, and nitrogen on zeolite 13X at high pressures[J]. Journal of Chemical and Engineering Data, 2004, 49: 1095-1101.
26	JahromiP E, FatemiS, VataniA, et al. Purification of helium from a cryogenic natural gas nitrogen rejection unit by pressure swing adsorption[J]. Separation and Purification Technology, 2018, 193: 91-102.
27	VemulaR R, KothareM V, SircarS. Lumped heat and mass transfer coefficient for simulation of a pressure swing adsorption process[J]. Separation Science and Technology, 2017, 52(1): 35-41.
28	DelgadoJ A, UguinaM A, SoteloJ L, et al. Fixed-bed adsorption of carbon dioxide/methane mixtures on silicalite pellets[J]. Adsorption-Journal of the International Adsorption Society, 2006, 12: 5-18.
29	DelgadoJ A, UguinaM A, SoteloJ L, et al. Fixed-bed adsorption of carbon dioxide-helium, nitrogen-helium and carbon dioxide-nitrogen mixtures onto silicalite pellets[J]. Separation and Purification Technology, 2006, 49: 91-100.
30	刘冰, 孙伟娜, 张东辉, 等. 带循环的二阶变压吸附碳捕集工艺模拟、实验及分析[J]. 化工学报, 2018, 69(11): 4788-4797.
	LiuB, SunW N, ZhangD H, et al. Simulation, experimentation and analyzation of two stage pressure swing adsorption process for CO₂ capture [J]. CIESC Journal, 2018, 69(11): 4788-4797.
31	孙伟娜, 阎海宇, 张东辉. 真空变压吸附分离氮气甲烷流程灵敏度分析与优化[J]. 化工学报, 2018, 69(2): 598-605.
	SunW N, YanH Y, ZhangD H. Sensitivity analysis and optimization of vacuum pressure swing adsorption process for N₂/CH₄ separation[J]. CIESC Journal, 2018, 69(2): 598-605.

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Parameter	He	CH₄
IP₁/(kmol·kg^-1·bar^-1)	2.483×10^-5	0.00111
IP₂/bar^-1	0.00405	0.0251

Parameter	He	CH₄
IP₁/(kmol·kg^-1·bar^-1)	2.483×10^-5	0.00111
IP₂/bar^-1	0.00405	0.0251

Parameter	Value
bed height, H_b / m	1.00
bed diameter, D_b / m	0.25
bed void fraction, E_i/(m³ void·(m³ bed)^-1)	0.37
particle void fraction, E_p/(m³ void·(m³ bead) ^-1)	0.21
particle density, ρ /(kg·m^-3)	670.0
particle radius, R_p / m	0.001
particle shape factor	1.0
mass transfer coefficient, MTC(CH₄)/s^-1	0.047
mass transfer coefficient, MTC(He)/s^-1	0.05

Parameter	Value
bed height, H_b / m	1.00
bed diameter, D_b / m	0.25
bed void fraction, E_i/(m³ void·(m³ bed)^-1)	0.37
particle void fraction, E_p/(m³ void·(m³ bead) ^-1)	0.21
particle density, ρ /(kg·m^-3)	670.0
particle radius, R_p / m	0.001
particle shape factor	1.0
mass transfer coefficient, MTC(CH₄)/s^-1	0.047
mass transfer coefficient, MTC(He)/s^-1	0.05

时间/s	塔1	塔2	塔3
45	进料升压	逆放减压	高压吸附
45	高压吸附	均压升2-3	均压降2-3
45	高压吸附	进料升压	逆流减压
45	均压降1-3	高压吸附	均压升1-3
45	逆放减压	高压吸附	进料升压
45	均压升1-2	均压降1-2	高压吸附