挥发分-焦炭交互反应对生物质热解焦炭结构的影响
|
摘要
为了解析生物质热化学利用过程中,挥发分与焦炭之间交互反应对生物质热解焦炭特性的影响,本文利用一阶固定床/流化床反应器及快速热裂解仪对交互反应对焦炭表面官能团特性影响开展研究。利用傅里叶红外光谱(FTIR)研究稻壳原料及不同条件下热解焦炭活性官能团结构特性。选择结构参数对于生物质及其热解焦炭结构变化进行定量分析。研究结果显示,热解温度对于焦炭表面的活性官能团有重要影响。热解温度的升高会导致焦炭表面的活性官能团种类机含量减少,焦炭的芳香化程度加深。交互反应条件下,焦炭表面的活性官能团种类以及含量较无交互反应下要少。交互反应对于焦炭表面羧基的影响最为明显,使得焦炭中的羧基含量大大减少,随温度的增高其官能团变化幅度变缓。
In order to analyze the effect of the interaction between volatile and coke on the pyrolysis of the biomass during the thermochemical utilization of biomass.The effect of interaction on the surface functional groups of coke was studied by using a fixed bed/fluidized bed reactor and a rapid pyrolysis apparatus. Fourier infrared spectroscopy(FTIR)was used to study rice husk materials and pyrolysis under different conditions of coke active functional group structure features.The structural parameters were selected for semi-quantitative analysis of biomass and pyrolytic coke structure changes.Research results show that the pyrolysis temperature has a significant effect for reactive functional groups on the surface of the coke.The increase of pyrolysis temperature will lead to the decrease of the content of active functional groups on the surface of coke and the deepening of the degree of aromaticity.Under the condition of interaction reaction, the active functional groups and the content of coke surface were less than those without interaction.The influence of the interaction on the surface carboxyl group of coke is the most obvious, which makes the carboxyl content of coke decrease greatly.
In order to analyze the effect of the interaction between volatile and coke on the pyrolysis of the biomass during the thermochemical utilization of biomass.The effect of interaction on the surface functional groups of coke was studied by using a fixed bed/fluidized bed reactor and a rapid pyrolysis apparatus. Fourier infrared spectroscopy(FTIR)was used to study rice husk materials and pyrolysis under different conditions of coke active functional group structure features.The structural parameters were selected for semi-quantitative analysis of biomass and pyrolytic coke structure changes.Research results show that the pyrolysis temperature has a significant effect for reactive functional groups on the surface of the coke.The increase of pyrolysis temperature will lead to the decrease of the content of active functional groups on the surface of coke and the deepening of the degree of aromaticity.Under the condition of interaction reaction, the active functional groups and the content of coke surface were less than those without interaction.The influence of the interaction on the surface carboxyl group of coke is the most obvious, which makes the carboxyl content of coke decrease greatly.
引文
[1]骆仲泱,周劲松,王树荣,等.中国生物质能利用技术评价[J].中国能源,2004,26(9):39-42.
[2]Li CZ.Importance of volatile-char interactions during the pyrolysis and gasification of low-rank fuels-A review[J].Fuel.2013,112(3):609-623.
[3]ASADULLAH M,ZHANG S,MIN Z,et al.Effects of biomass char structure on its gasification reactivity[J].Bioresource technology.2010,101(20):7935-7943.
[4]谢克昌.煤的结构和反应性[M].北京:科学出版社,2002:222.
[5]Georgakopoulos A.Study of low rank Greek coals using FTIR spectroscopy[J].Energy sources,2003,25(10):995-1005.
[6]?ern?J.Structural dependence of CH bond absorptivities and consequences for FT-ir analysis of coals[J].Fuel,1996,75(11):1301-1306.
[7]Yao Song,Chun-Zhu Li,et al.Effects of volatile-char interactions on in-situ destruction of nascent tar during the pyrolysis and gasification of biomass.Part II.Roles of steam[J].Fuel,2015,143:555-562.
[8]Giroux L,Charland J P,Mac Phee J A.Application of thermogravimetric Fourier transform infrared spectroscopy(TG-FTIR)to the analysis of oxygen functional groups in coal[J].Energy&fuels,2006,20(5):1988-1996.
[9]Jing-Biao Y,Ning-Sheng C.A TG-FTIR study on catalytic pyrolysis of coal[J].Journal of Fuel Chemistry and Technology,2006,34(6):650-654.
[10]黄晓宏,柳朝晖,尹志强,等.无烟煤热解过程中表面官能团的演变[J].工程热物理学报,2013,34(005):969-972.
[2]Li CZ.Importance of volatile-char interactions during the pyrolysis and gasification of low-rank fuels-A review[J].Fuel.2013,112(3):609-623.
[3]ASADULLAH M,ZHANG S,MIN Z,et al.Effects of biomass char structure on its gasification reactivity[J].Bioresource technology.2010,101(20):7935-7943.
[4]谢克昌.煤的结构和反应性[M].北京:科学出版社,2002:222.
[5]Georgakopoulos A.Study of low rank Greek coals using FTIR spectroscopy[J].Energy sources,2003,25(10):995-1005.
[6]?ern?J.Structural dependence of CH bond absorptivities and consequences for FT-ir analysis of coals[J].Fuel,1996,75(11):1301-1306.
[7]Yao Song,Chun-Zhu Li,et al.Effects of volatile-char interactions on in-situ destruction of nascent tar during the pyrolysis and gasification of biomass.Part II.Roles of steam[J].Fuel,2015,143:555-562.
[8]Giroux L,Charland J P,Mac Phee J A.Application of thermogravimetric Fourier transform infrared spectroscopy(TG-FTIR)to the analysis of oxygen functional groups in coal[J].Energy&fuels,2006,20(5):1988-1996.
[9]Jing-Biao Y,Ning-Sheng C.A TG-FTIR study on catalytic pyrolysis of coal[J].Journal of Fuel Chemistry and Technology,2006,34(6):650-654.
[10]黄晓宏,柳朝晖,尹志强,等.无烟煤热解过程中表面官能团的演变[J].工程热物理学报,2013,34(005):969-972.