Effect of structured 5A molecular sieve adsorption bed structure and process parameters on N2/H2 adsorption performance

doi:10.11949/0438-1157.20191349

Abstract

Abstract:

The kinetic parameters were obtained by adsorption isotherm, and the CFD model was established to simulate the adsorption process of hydrogen/nitrogen in the structured 5A molecular sieve adsorption bed. The effects of structural parameters such as the adsorbent sheet spacing and thickness and process parameters such as adsorption pressure and volume flow rate on the adsorption performance to the mixed gas were discussed. The results show that reducing sheet spacing and thickness are beneficial to the mass transfer coefficient and bed saturation degree. Increasing the adsorption pressure can improve the bed saturation degree, but will reduce the mass transfer coefficient. The effect of the flow rate on mass transfer coefficient is not obvious, but when the flow rate is high, both the adsorption capacity and the bed saturation degree decrease. The structured 5A molecular sieve adsorbent has good adsoption performance.

Key words: structured 5A molecular sieve, adsorption performance, hydrogen purification, kinetic modeling

摘要：

利用吸附等温线获得动力学参数，建立了CFD模型，模拟了氢气/氮气在结构化5A分子筛吸附床中的吸附过程，研究了吸附剂层片间距、吸附剂厚度等结构参数和吸附压力、进气流量等工艺参数对混合气吸附效果的影响。结果表明：减小层片间距和吸附剂厚度可显著提高传质系数和床层利用率。增大吸附压力可提高床层利用率，但会减小传质系数。进气流量对传质系数的影响不明显，但当流量较大时，吸附容量和床层利用率均呈减小趋势。结构化5A分子筛吸附剂吸附性能良好。

关键词: 结构化5A分子筛, 吸附性能, 氢气提纯, 动力学模型

CLC Number:

TQ 028.1

Peng WANG, Jinglei LIU, Shengzhong ZHANG, Dequan FAN, Ying ZHANG, Hong XU. Effect of structured 5A molecular sieve adsorption bed structure and process parameters on N₂/H₂ adsorption performance[J]. CIESC Journal, 2020, 71(7): 3114-3122.

王鹏, 刘京雷, 张胜中, 范得权, 张英, 徐宏. 结构化5A分子筛吸附床结构及工艺参数对N₂/H₂吸附性能的影响[J]. 化工学报, 2020, 71(7): 3114-3122.

参数	数值
$q m N 2$ /( mol·kg^-1)	2.265
$q m H 2$ /(mol·kg^-1)	1.155
$b N 2$ /MPa^-1	1.48
$b H 2$ /MPa^-1	0.117

吸附条件		床层利用率/%	无效层长度/cm
层片间距/mm(层片厚度0.8 mm)	0.2	51.1	9.78
	0.5	48.2	10.36
	0.8	45.7	10.86
层片厚度/mm(层片间距0.2 mm)	0.4	68.2	6.36
	0.6	61.8	7.64
	0.8	51.1	9.78
吸附压力/MPa(流量100 ml·min^-1)	0.2	46.3	10.74
	0.4	51.1	9.78
	0.8	57.5	8.51
进气流量/(ml·min^-1)（压力0.4 MPa）	60	60.1	7.98
	100	51.1	9.78
	140	45.2	10.96

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参数	数值
l/m	0.2
ρ/(kg·m^-3)	860
ε	0.4
T/K	298
$c N 2$ /%	25
$c H 2$ /%	75

参数	数值
l/m	0.2
ρ/(kg·m^-3)	860
ε	0.4
T/K	298
$c N 2$ /%	25
$c H 2$ /%	75

Effect of structured 5A molecular sieve adsorption bed structure and process parameters on N2/H2 adsorption performance

结构化5A分子筛吸附床结构及工艺参数对N2/H2吸附性能的影响

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Effect of structured 5A molecular sieve adsorption bed structure and process parameters on N₂/H₂ adsorption performance

结构化5A分子筛吸附床结构及工艺参数对N₂/H₂吸附性能的影响