Thermodynamic analysis of auto-thermal chemical looping hydrogen production systems  

作　　者：LI PeiJing LIU TaiXiu LI JiChao QIN YuanLong LIU QiBin 

机构地区：[1]School of Energy Power,and Mechanical Engineering,North China Electric Power University,Beijing 102206,China [2]Institute of Engineering Thermophysics,Chinese Academy of Sciences,Beijing 100190,China [3]University of Chinese Academy of Sciences,Beijing 100049,China [4]Department of Thermal Science and Energy Engineering,University of Science and Technology of China,Hefei 230027,China

出　　处：《Science China(Technological Sciences)》2024年第12期3707-3723,共17页中国科学(技术科学英文版)

基　　金：supported by the Distinguish Young Scholars of the National Natural Science Foundation of China(Grant No.52225601);the Major Program of the National Natural Science Foundation of China(Grant No.52090061)。

摘　　要：Chemical looping hydrogen production is of interest because of its ability to simultaneously produce hydrogen and capture CO_(2) at the same time.Achieving an energy balance is crucial in chemical-looping hydrogen production systems.Decreasing the external heat duty can effectively reduce carbon capture and energy conversion efficiency.In this study,two auto-thermal chemical looping H_(2) generation systems are proposed.An adiabatic counter current moving bed chemical looping H_(2) generation system using CH_(4) as fuel and Fe_(2)O_(3) and Al_(2)O_(3) (inert carriers)as oxygen carriers(OC)is proposed to analyse the energy balance and exergy balance of the systems.A parametric analysis was conducted to investigate the influence of the reaction ratio and temperature on the product outcomes,leading to the determination of optimal operating conditions.Subsequently,the impact of hydrogen production efficiency and reduction reactor outlet stream ratio and inert component proportion in the oxygen carrier on the system's thermal balance was analysed under these optimal conditions,culminating in the identification of key parameters for the two auto-thermal systems.Energy balance and exergy balance analyses were employed to compare the energy efficiency and irreversible losses of the autothermal and reference systems.The results demonstrated that the autothermal system enhanced the energy efficiency by 2.5%and the CO_(2)capture rate by 11%(percentage points)compared with the reference system.

关 键 词：chemical looping hydrogen generation hydrogen production auto-thermal energy balance analysis exergy balance analysis 

分 类 号：TQ116.2[化学工程—无机化工] TK91[动力工程及工程热物理]