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首页> 外文会议>American Chemical Society national meeting >Experimental and Kinetic Investigation of CO_2 and H_2O/N_2 Gasification of Biomass Fuels
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Experimental and Kinetic Investigation of CO_2 and H_2O/N_2 Gasification of Biomass Fuels

机译：生物质燃料的CO_2和H_2O / N_2气化的实验和动力学研究

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Characterization of the thermal decomposition of various woods, grasses and the biomass structural components, lignin and cellulose, was performed using a TGA with online GC analysis in both CO_2 and H2O/N2 gasification environments. CO_2 was observed to be a more efficient gasification environment that resulted in improved bio-char conversion during gasification. Introduction of CO_2 as co-feed into the gasification environment resulted in enhanced CO and depressed H_2 and CH_4 concentrations enabling greater control in the syngas ratio produced by adjustment of the level of CO_2 introduced. Mass decomposition and H_2, CO, CO_2 and CH4 gas evolution studies were performed for the various feedstocks at heating rates of from 1-100°C min~(-1) in both gasification media. When comparing the residual mass fractions of lignin and cellulose gasified in CO_2 subjected to slow (1°C min~(-1)) and fast (100°C min~(-1)) heating rates, greater differential processing of the two components was possible with 65%, rather than 42%, of the lignin remaining following cellulose decomposition at the slow heating rate. Selective isolation of the thermally resistant lignin, retaining a greater residual fraction of this structural component, was observed during CO_2 gasification at the lowest heating rates. While cellulose thermal decomposition was observed to occur over a narrow temperature window, ～275-425°C, thermal degradation of lignin occurs over a much wider range beginning about 175°C and finishing after 700°C with more than a 35% mass loss after 700°C in a CO_2 gasification environment. A least squares best fit analysis for the global kinetic parameters gave an average pyrolysis activation energy for lignin and cellulose in CO_2 as 43 and 211 kJ mol~(-1), while that for lignin and cellulose in H_2O/N_2 was 53 and 203 kJ mol~(-1), respectively. The analysis showed a pyrolysis best fit reaction order of three for lignin and one for cellulose. The various biomass feedstocks showed activation energies between 28-72 kJ mol~(-1) and reaction orders of one or two, with samples high in cellulose content showing correspondingly higher energies and lower reaction order.
机译：使用TGA在CO_2和H2O / N2气化环境中使用具有在线GC分析的TGA进行各种树木，草和生物质结构组分，木质素和纤维素的热分解的表征。认为CO_2是一种更有效的气化环境，导致气化过程中的生物焦炭转化。 CO_2的引入作为加入气化环境导致增强的CO和抑郁的H_2和CH_4浓度，从而通过调节介绍的CO_2水平产生的合成气比。在气化介质中，在加热速率下对各种原料进行大规模分解和H_2，CO，CO_2和CH4气体进化研究在气化介质中为1-100℃min〜（-1）。比较CO_2中气化的木质素和纤维素的残留质量分数进行缓慢（1℃min〜（-1））和快速（100℃min〜（-1））加热速率，两个组件的更大差分加工在缓慢的加热速率下纤维素分解后，含有65％而不是42％，仍然可以进行65％而不是42％。在最低加热速率下，在CO_2气化期间观察到导热木质素的选择性分离，保持较大的该结构组分的残余部分。虽然观察到纤维素热分解在窄温度窗口上发生，但在〜275-425℃的〜275-425℃下，木质素的热降解在大约175℃的范围内发生在大约175℃并在700℃下完成超过35％的质量损失在CO_2气化环境中700°C后。全球动力学参数的最小二乘性最佳拟合分析为木质素和CO_2中的木质素和纤维素的平均热解激活能量为43和211kJ mol〜（-1），而H_2O / N_2的木质素和纤维素为53和203 kJ分别为mol〜（-1）。分析显示了木质素的三种热解最适合的反应顺序，一种用于纤维素。各种生物质原料显示在28-72kJ摩尔〜（-1）和一两种反应序列之间的活化能量，其中样品高，纤维素含量高，显示相应的能量和更低的反应顺序。

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