本文選題：纖維素　切入點(diǎn)：反應(yīng)動力學(xué)　出處：《浙江大學(xué)學(xué)報(工學(xué)版)》2002年02期 　論文類型：期刊論文

【摘要】：盡管針對纖維素?zé)崃呀鈩恿W(xué)方面的研究已開展得比較廣泛 ,但其表觀動力學(xué)的確定仍是一具有爭論性的問題 ,從而對纖維素?zé)崃呀鈾C(jī)理的描述也就各不相同 .本文試圖通過纖維素的熱裂解動力學(xué)研究 ,對此種現(xiàn)象作出合理的解釋 ,并給出相應(yīng)的機(jī)理描述 .纖維素?zé)崃呀怆S溫度的升高經(jīng)歷了五個不同的階段 ,其中第三階段是整個過程的主要部分 ,期間大量揮發(fā)分析出并造成明顯失重 .試驗(yàn)發(fā)現(xiàn)隨著升溫速率的增加 ,熱滯后現(xiàn)象的加重致使纖維素?zé)崃呀飧鱾�階段向高溫側(cè)移動 ;同時高升溫速率對炭的生成具有抑制作用 ,但有利于揮發(fā)分的生成 .通過對熱裂解主反應(yīng)區(qū)的熱重分析 ,采用微商法求得對應(yīng)的反應(yīng)動力學(xué)參數(shù) ,以 6 0 0 K作為分界點(diǎn) ,低溫段的活化能約在2 6 7k J/ m ol,較高溫度段則體現(xiàn)為 174 k J/ mol左右的低活化能 .纖維素?zé)崃呀馐且粋鳠醾髻|(zhì)現(xiàn)象 ,與化學(xué)動力學(xué)機(jī)制相互影響、控制的過程 ,試驗(yàn)條件、傳熱傳質(zhì)過程的影響是造成結(jié)論存在差異的內(nèi)在原因
[Abstract]:Although the research on the kinetics of cellulose pyrolysis has been carried out extensively, the determination of the apparent kinetics of cellulose is still a controversial issue. Therefore, the description of the mechanism of cellulose pyrolysis is different. This paper attempts to give a reasonable explanation of this phenomenon through the study of the pyrolysis kinetics of cellulose. The pyrolysis of cellulose goes through five different stages with the increase of temperature, and the third stage is the main part of the whole process. It was found that with the increase of heating rate and the increase of thermal hysteresis phenomenon, cellulose pyrolysis moved to the high temperature side in each stage. At the same time, the high heating rate can inhibit the formation of carbon, but it is beneficial to the formation of volatile matter. By thermogravimetric analysis of the main reaction zone of pyrolysis, the corresponding kinetic parameters of the reaction are obtained by microquotient method. The activation energy at low temperature is about 267kJ / mol, and the activation energy at higher temperature is about 174kJ / mol. The pyrolysis of cellulose is a heat and mass transfer phenomenon. Interaction with chemical kinetic mechanisms, controlled processes, experimental conditions, and effects of heat and mass transfer are the underlying reasons for the differences in conclusions.
【作者單位】： 浙江大學(xué)能源潔凈利用與環(huán)境教育部重點(diǎn)實(shí)驗(yàn)室 浙江大學(xué)能源潔凈利用與環(huán)境教育部重點(diǎn)實(shí)驗(yàn)室 浙江大學(xué)能源潔凈利用與環(huán)境教育部重點(diǎn)實(shí)驗(yàn)室 浙江大學(xué)能源潔凈利用與環(huán)境教育部重點(diǎn)實(shí)驗(yàn)室 浙江大學(xué)能源潔凈利用與環(huán)境教育部重點(diǎn)實(shí)驗(yàn)室 浙江大學(xué)能源潔凈利用與環(huán)境教育部重點(diǎn)實(shí)驗(yàn)
【基金】：國家自然科學(xué)基金資助項(xiàng)目 (5 0 1760 46)、(2 99760 3 9) 國家杰出青年科學(xué)基金資助項(xiàng)目 (5 0 0 2 5 618)
【分類號】：TQ351.2
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本文編號：1643628