解耦双回路气化系统中生物质催化水蒸气气化制富氢气体  

Hydrogen-rich gas production from catalytic steam gasification of biomass in a decoupled dual loop gasification system

作　　者：肖亚辉 刘勇 乔聪震 徐绍平[2] XIAO Ya-hui;LIU Yong;QIAO Cong-zhen;XU Shao-ping(Henan Engineering Research Center of Resource&Energy Recovery from Waste,College of Chemistry and Chemical Engineering,Henan University,Kaifeng 475004,China;State Key Laboratory of Fine Chemicals,School of Chemical Engineering,Dalian University of Technology,Dalian 116024,China)

机构地区：[1]河南大学化学化工学院河南省废弃物资源能源化工程技术研究中心,河南开封475004 [2]大连理工大学化工学院精细化工国家重点实验室,辽宁大连116024

出　　处：《燃料化学学报》2019年第12期1430-1439,共10页Journal of Fuel Chemistry and Technology

基　　金：国家自然科学基金(50776013,21676072);河南省高等学校重点科研项目(20A530002)资助~~

摘　　要：采用密度泛函理论方法,对四种β-O-4型二聚体木质素模型化合物2-(2-甲氧基苯氧基)-1-苯基乙烷-1-醇、2-(2-甲氧基苯氧基)-1-苯基乙烷-1-酮、1-甲氧基-2-(2-甲氧基-2-苯基乙氧基)苯、2-(2-甲氧基苯氧基)-1-苯乙基乙酸酯的Caromatic-O、Caromatic-Cα、Cα-Cβ、Cβ-O键均裂解离能进行了理论计算,并对所述二聚体的热解均裂历程进行了理论计算研究,分析了不同二聚体的热解产物形成途径。结果表明,Cβ-O键均裂是二聚体初次热解的主要反应,Cα-Cβ键均裂是竞争反应。Cα-OH官能团被氧化、乙酰化修饰后,Cβ-O键均裂解离能降低,而Cα-Cβ键的键解离能升高,Cβ-O键裂解概率增大,Cα-Cβ键均裂竞争性降低。基于上述四种模型化合物热解的主要芳香族产物有苯甲醇、甲苯、苯甲醛和愈创木酚等,Cα-OH官能团的选择性修饰可调控热解产物种类,其中,氧化修饰后的二聚体的热解产物种类变少,产物选择性增强;甲基化、乙酰化修饰后的二聚体热解可产生苯乙烷和甲苯。In order to strengthen tar destruction and hydrogen-rich gas production in the biomass gasification, a novel decoupled dual loop gasification(DDLG) system was proposed. The system decouples gasification process into fuel gasification, tar reforming and residual char combustion, which occur in three independent reactors, i.e. gasifier, reformer and combustor. Both the gasifier and the reformer are separately interconnected with the combustor, forming two circulation loops in parallel. With pine sawdust as feedstock, and calcined olivine as both solid heat carriers and in-situ tar destruction catalyst, the performance of biomass gasification was investigated. The results indicate that the reforming after the gasifier and the presence of olivine catalyst greatly improve the tar destruction. Specifically, at the gasifier temperature of 700 ℃, the reformer temperature of 850 ℃ and the steam to carbon mass ratio(S/C) of 1.2, the tar content in product gas decreases to 13.9 g/m3, and the dry gas yield and H2 concentration reach 1.0 m3/kg, and 38.8%, respectively.

关 键 词：生物质气化 解耦 焦油脱除 富氢气体 

分 类 号：TK6[动力工程及工程热物理—生物能]