Energetic analysis of gasification of biomass by partial oxidation in supercritical water  

生物质超临界水部分氧化气化的能量过程分析(英文)

作　　者：关清卿 韦朝海 柴欣生 宁平 田森林 谷俊杰 陈秋玲 庙荣荣 

机构地区：[1]Faculty of Environmental Science and Engineering, Kunming University of Science and Technology [2]The Key Lab of Pollution Control and Ecosystem Restoration in Industry Clusters, College of Environment and Energy, South China University of Technology [3]State Key Laboratory of Pulp and Paper Engineering, South China University of Technology

出　　处：《Chinese Journal of Chemical Engineering》2015年第1期205-212,共8页中国化学工程学报（英文版）

基　　金：Supported by the National Natural Science Foundation of China(21037001,21076091,21307049);the National Key Project for Basic Research of China(2008BAC32B06-1);Yunnan Province High-tech Talent Introduction Project(2010CI110);the Important Yunnan Province's Science&Technology Specific Project(2012ZB002);the Yunnan Science Foundation(2013FZ032,14118583)

摘　　要：Partial oxidation gasification in supercritical water could produce fuel gases(such as H2, CO and CH4) and significantly reduce the energy consumption. In this work, an energetic model was developed to analyze the partial oxidative gasification of biomass(glucose and lignin) in supercritical water and the related key factors on which gasification under autothermal condition depended upon. The results indicated that the oxidant equivalent ratio(ER) should be over 0.3 as the concern about energy balance but less than 0.6 as the concern about fuel gas production. Feedstocks such as glucose and lignin also had different energy recovery efficiency. For materials which can be efficiently gasified, the partial oxidation might be a way for energy based on the combustion of fuel gases. Aromatic materials such as lignin and coal are more potential since partial oxidation could produce similar amount of fuel gases as direct gasification and offer additional energy. Energy recovered pays a key role to achieve an autothermal process. Keeping heat exchanger efficiency above 80% and heat transfer coefficient below15 k J·s-1is necessary to maintain the autothermal status. The results also indicated that the biomass loading should be above 15% but under 20% for an autothermal gasification, since the increase of biomass loading could improve the energy supplied but decrease the efficiency of gasification and gaseous yields. In general,some specific conditions exist among different materials.Partial oxidation gasification in supercritical water could produce fuel gases（such as H2, CO and CH4） and significantly reduce the energy consumption. In this work, an energetic model was developed to analyze the partial oxidative gasification of biomass（glucose and lignin） in supercritical water and the related key factors on which gasification under autothermal condition depended upon. The results indicated that the oxidant equivalent ratio（ER） should be over 0.3 as the concern about energy balance but less than 0.6 as the concern about fuel gas production. Feedstocks such as glucose and lignin also had different energy recovery efficiency. For materials which can be efficiently gasified, the partial oxidation might be a way for energy based on the combustion of fuel gases. Aromatic materials such as lignin and coal are more potential since partial oxidation could produce similar amount of fuel gases as direct gasification and offer additional energy. Energy recovered pays a key role to achieve an autothermal process. Keeping heat exchanger efficiency above 80% and heat transfer coefficient below15 k J·s-1is necessary to maintain the autothermal status. The results also indicated that the biomass loading should be above 15% but under 20% for an autothermal gasification, since the increase of biomass loading could improve the energy supplied but decrease the efficiency of gasification and gaseous yields. In general,some specific conditions exist among different materials.

关 键 词：AUTOTHERMAL GASIFICATION Supercritical water BIOMASS Energetic model 

分 类 号：TQ038.4[化学工程]