Thermodynamic study on hydrogen production from suspended bed hydrodesulfurization tail gas by steam reforming

doi:10.16085/j.issn.1000-6613.2019-0742

Abstract

Abstract: This paper takes the suspended bed hydrodesulfurization tail gas as the raw material of steam reforming hydrogen production, constructed a chemical reaction system containing six independent reactions by the modified atomic number matrix method. Investigating the variation of the standard molar reaction enthalpy, Gibbs free energy change and equilibrium constant of each independent reaction at different reaction temperatures. Make the use of GIBBS reactor to study the effects of reactor outlet temperature, reaction pressure and water-carbon molar ratio on the equilibrium composition of the product. The results of thermodynamic studies show that with the increase of the carbon number of the alkane, the sensitivity increased of the equilibrium constant, the Gibbs free energy change and the standard molar reaction enthalpy for reaction temperature and reach the same conversion need lower temperature. HYSYS simulation confirmed that the most suitable reaction conditions under the system were reactor outlet temperature of 700℃, reaction pressure of 100kPa, and water to carbon ratio of 4.

Key words: hydrogen production, thermodynamics, simulation, equilibrium, steam reforming

摘要： 以悬浮床加氢脱硫尾气为水蒸气转化制氢原料，采用改进的原子序数矩阵法构建了包含6个独立反应的化学反应体系。分别考察各个独立反应在不同反应温度下，标准摩尔反应焓、吉布斯自由能变及平衡常数的变化规律；借助HYSYS流程模拟软件中的GIBBS反应器，研究反应器出口温度、反应压力及水碳物质的量之比对产物平衡组成的影响。热力学研究结果表明：烷烃碳数越高，水蒸气转化反应的平衡常数、吉布斯自由能变和标准摩尔焓对温度的敏感性越高，达到相同转化效果所需的反应温度越低。HYSYS模拟确定该体系下最适宜的反应条件为反应器出口温度700℃、反应压力100kPa、水碳物质的量之比4。

关键词: 制氢, 热力学, 模拟, 平衡, 水蒸气转化

CLC Number:

TQ013.1

YANG Cheng, HUANG Chuanfeng, ZHAO Lixin, LI Wei, YANG Tianhua, ZHU Yonghong. Thermodynamic study on hydrogen production from suspended bed hydrodesulfurization tail gas by steam reforming[J]. Chemical Industry and Engineering Progress, 2019, 38(s1): 33-38.

杨程, 黄传峰, 赵丽信, 李伟, 杨天华, 朱永红. 悬浮床加氢脱硫尾气水蒸气转化制氢热力学[J]. 化工进展, 2019, 38(s1): 33-38.

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