Comparison of CO_(2)with H_(2)O as the transport medium in a biomass supercritical water gasification system  

作　　者：Weizuo Wang Bingru Lu Jinwen Shi Qiuyang Zhao Hui Jin 

机构地区：[1]State Key Laboratory of Multiphase Flow in Power Engineering,Xi’an Jiaotong University,Xi’an 710049,China

出　　处：《Frontiers of Chemical Science and Engineering》2024年第11期121-133,共13页化学科学与工程前沿（英文版）

基　　金：National Key R&D Program of China(Grant No.2020YFA0714400).

摘　　要：Supercritical water gasification is a clean technology for biomass conversion and utilization.In supercritical water gasification systems,H_(2)O is often used as the transport medium.Decreases in the reaction temperature at the gasification area and in the heating rate of biomass may limit the gasification rate and efficiency.In this paper,CO_(2)is used as the transport medium due to its relatively low critical point and specific heat capacity.Moreover,a corn stalk gasification system with different transport media is established in this paper,and the influences of various operating parameters,such as temperature,pressure and feedstock concentration,are investigated.The results show that the gas yield in the CO_(2)-transport system decreases by no more than 5 wt%.In addition,thermodynamic analysis reveals that a system with CO_(2)as transport medium consumes approximately 25%less electricity than a system with H_(2)O as the transport medium.In addition,the reaction heat absorption decreases.The results show the superiority of CO_(2)to H_(2)O as a transport medium.

关 键 词：biomass supercritical water gasification hydrogen production CO_(2)transport energy and exergy analyses 

分 类 号：TK6[动力工程及工程热物理—生物能]