Numerical simulation of temperature swing adsorption for SF6 recovery from mixed insulating gas

doi:10.16085/j.issn.1000-6613.2024-2129

Abstract

Abstract:

Sulfur hexafluoride (SF₆) is a strong greenhouse gas. To reduce its emission, this study proposed recovering SF₆ from mixed insulating gas (with 85% SF₆ and 15% N₂ mole fractions) using temperature swing adsorption (TSA) cycle. Numerical simulation was employed to establish the physical and mathematical models of the cycle, and the reliability of the model was verified through comparison with the experimental data in the literature. Three performance evaluation indices (purity, recovery and specific energy consumption) were used to investigate the effects of different adsorbent materials, geometric dimensions of adsorption bed and operating conditions on TSA cycle performance. The results showed that Mg-MOF-74 exhibited the best cycle performance, followed by AC, UIO-66 and 13X. For adsorption beds with equivalent length-to-diameter ratios ranging from 6.9 to 23.6, the cycle performance improved with increasing ratio, achieving maximum purity and recovery rates of 69.31% and 62.90%, respectively, and a minimum specific energy consumption of 1.89MJ/kg. Lower adsorption temperatures and higher desorption temperatures increased the SF₆ cyclic working capacity of adsorbents, thereby enhancing SF₆ recovery from mixed insulating gas.

Key words: sulfur hexafluoride (SF₆), adsorption, separation, recovery, computational fluid dynamics (CFD), numerical simulation

摘要：

SF₆是一种重点控制的强温室气体。为了减少其排放，本文提出使用变温吸附（TSA）循环从混合绝缘气体中（SF₆的摩尔分数为15%，N₂的摩尔分数为85%）分离回收SF₆。采用数值模拟方法建立了TSA循环的物理模型和数学模型，与文献实验数据对比并证明了模型的可靠性。采用3种性能评价指标（纯度、回收率、比能耗），研究不同的吸附剂材料、吸附床几何尺寸和操作条件对TSA循环性能的影响。结果表明，4种材料的循环性能最好的是Mg-MOF-74，然后是AC、UIO-66、13X。吸附剂采用Mg-MOF-74，吸附床当量长径比在6.9~23.6内时，循环性能随长径比增大而提升，纯度和回收率最高分别可达到69.31%和62.90%，比能耗最低为1.89MJ/kg。降低吸附温度和升高解吸温度有利于增大材料的SF₆循环工作容量，对混合绝缘气体分离回收SF₆有利。

关键词: 六氟化硫, 吸附, 分离, 回收, 计算流体力学, 数值模拟

CLC Number:

X701

WU Jinyi, ZHAO Ruikai, DENG Shuai, ZHANG Jiaqi, GAO Chunxiao, LIU Weihua, ZHAO Li. Numerical simulation of temperature swing adsorption for SF₆ recovery from mixed insulating gas[J]. Chemical Industry and Engineering Progress, 2025, 44(S1): 19-28.

武锦怡, 赵睿恺, 邓帅, 张家麒, 高春霄, 刘葳桦, 赵力. 混合绝缘气体变温吸附分离回收SF₆的数值模拟[J]. 化工进展, 2025, 44(S1): 19-28.

Figures/Tables 20

References 27

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SF₆物性参数	数值
密度ρ_g/kg∙m^-3	6.07
摩尔质量M/g∙mol^-1	146.07
热导率k_g/W∙m^-1∙K^-1	0.014
比热容c_p_,g/J∙kg^-1∙K^-1	650
动力黏度μ/kg∙m^-1∙s^-1	1.58×10^-5

SF₆物性参数	数值
密度ρ_g/kg∙m^-3	6.07
摩尔质量M/g∙mol^-1	146.07
热导率k_g/W∙m^-1∙K^-1	0.014
比热容c_p_,g/J∙kg^-1∙K^-1	650
动力黏度μ/kg∙m^-1∙s^-1	1.58×10^-5

参数	数值
壁面厚度δ/m	0.001
密度ρ_w/kg∙m^-3	8030
比热容c_p_,w/J∙kg^-1∙K^-1	502.48

参数	数值
壁面厚度δ/m	0.001
密度ρ_w/kg∙m^-3	8030
比热容c_p_,w/J∙kg^-1∙K^-1	502.48

吸附剂性能	UIO-66^[15-16]	13X^[17]	AC^[18]	Mg-MOF-74^[19]
密度ρ_s/kg∙m^-3	380	1099.5	592	911
比热容c_p_,s/J∙kg^-1∙K^-1	750	920	887	900
孔隙率ε	0.246	0.565	0.36	0.7417
传热系数λ_s/W∙m^-1∙K^-1	0.32	0.15	0.3	0.3
颗粒直径d/mm	0.36	1	2	0.2
黏性阻力系数α^-1/m^-2	4.420×10¹⁰	1.574×10⁸	3.292×10⁸	6.132×10⁸
惯性阻力系数C₂/m^-1	4.924×10⁵	8.441×10³	2.401×10⁴	1.108×10⁴

Numerical simulation of temperature swing adsorption for SF₆ recovery from mixed insulating gas

混合绝缘气体变温吸附分离回收SF₆的数值模拟

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References 27

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吸附剂材料	气体种类	q_m/mol·kg^-1	k₀/Pa^-1	n	ΔH/J·mol^-1
UIO-66	SF₆	1.81	2.92×10^-10	0.581	-38906
UIO-66	N₂	12.03	4.74×10^-10	0.57	-14582
13X	SF₆	1.546	9.402×10^-10	1.053	-26173
13X	N₂	1.014	2.26×10^-8	0.4376	-13360
AC	SF₆	4.765	6.995×10^-12	0.440	-42193
AC	N₂	9.74	6.91×10^-10	0.518	-16310
Mg-MOF-74	SF₆	6.565	3.206×10^-11	1.849	-34444
Mg-MOF-74	N₂	6.7072	9.36×10^-10	1	-18000

参数	UIO-66	13X	AC	Mg-MOF-74
SF₆吸附时间常数/s^-1	0.1	0.1	0.1	0.1
N₂吸附时间常数/s^-1	0.15^[28]	0.6^[29]	0.2^[18]	0.313^[22]

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