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TG study on pyrolysis of biomass and its three components under syngas

机译：TG在合成气下热解生物质及其三组分的TG研究。

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Pyrolysis of sawdust and its three components (cellulose, hemicellulose and lignin) were performed in a thermogravimetric analyzer (TGA92) under syngas and hydrogen. The effect of different heating rates (5, 10, 15 and 20 ℃/min) on the pyrolysis of these samples were examined. The pyrolysis tests of the synthesized samples (a mixture of the three components with different ratios) were also done under syngas. The distributed activation energy model (DAEM) was used to study the pyrolysis kinetics. It is found that syngas could replace hydrogen in hydropyrolysis process of biomass. Among the three components, hemicellulose would be the easiest one to be pyro-lyzed and then would be cellulose, while lignin would be the most difficult one. Heating rate could not only affect the temperature at which the highest weight loss rate reached, but also affect the maximum value of weight loss rate. Both lignin and hemicellulose used in the experiments could affect the pyrolysis characteristic of cellulose while they could not affect each other obviously in the pyrolysis process. Values of k_0 (frequency factor) change very greatly with different E (activation energy) values. The E values of sawdust range from 161.9 to 202.3 kJ/mol, which is within the range of activation energy values for cellulose, hemicellulose and lignin.
机译：在合成气和氢气下，在热重分析仪（TGA92）中对木屑及其三个成分（纤维素，半纤维素和木质素）进行热解。研究了不同加热速率（5、10、15和20℃/ min）对这些样品热解的影响。还在合成气下对合成样品（三种组分的比例不同的混合物）进行了热解试验。分布式活化能模型（DAEM）用于研究热解动力学。发现合成气可以在生物质的热解过程中替代氢。在这三种成分中，半纤维素是最容易被热解的成分，然后是纤维素，而木质素则是最困难的成分。加热速率不仅会影响达到最高失重率的温度，而且还会影响失重率的最大值。实验中使用的木质素和半纤维素都可以影响纤维素的热解特性，而在热解过程中它们之间不会产生明显的相互影响。 k_0（频率因数）的值随E（活化能）值的不同而变化很大。锯末的E值范围为161.9至202.3 kJ / mol，在纤维素，半纤维素和木质素的活化能值范围内。

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