【摘要】：通過建立多組分平行反應(yīng)模型和開展非線性動(dòng)力學(xué)解析,理論上探索植物焦炭氧化中的平行反應(yīng)以及其對(duì)焦炭氧化反應(yīng)活性影響的機(jī)制.運(yùn)用高溫管式爐并通入高純氮?dú)庵苽渲参锝固?熱處理溫度分別設(shè)定為450、520和800℃.運(yùn)用同步熱分析儀開展空氣氣氛中植物焦炭線性升溫氧化實(shí)驗(yàn),并通過對(duì)熱重和質(zhì)量損失速率實(shí)驗(yàn)數(shù)據(jù)進(jìn)行擬合以獲取焦炭氧化動(dòng)力學(xué)參數(shù)值.解析結(jié)果證實(shí),對(duì)于低中熱處理溫度(450和520℃)制得的焦炭,其質(zhì)量損失速率及對(duì)應(yīng)的熱流率曲線的變化特征主要是由殘留木質(zhì)素、無定形碳及粗脂肪和粗蛋白等其它反應(yīng)物質(zhì)的平行氧化反應(yīng)疊加而成;當(dāng)熱處理溫度達(dá)到800℃時(shí),焦炭中活性物質(zhì)基本為無定形碳,氧化則可簡化為無定形碳的單步反應(yīng).殘留木質(zhì)素氧化反應(yīng)的活化能最低,范圍為86~147 k J·mol-1,相應(yīng)的溫度作用區(qū)間為300~480℃;無定形碳的活化能為174~208kJ·mol-1,反應(yīng)溫度在370~520℃之間;其它物質(zhì)的反應(yīng)活化能為214~225 k J·mol-1,溫度作用區(qū)間在420~510℃之間.焦炭的氧化活性主要由殘留木質(zhì)素含量決定.隨著熱處理溫度升高,殘留木質(zhì)素含量降低,同時(shí)另兩個(gè)反應(yīng)組分的氧化活化能均有所增大,導(dǎo)致焦炭的氧化反應(yīng)活性下降.
[Abstract]:Through the establishment of multi-component parallel reaction model and the analysis of nonlinear kinetics, the mechanism of the parallel reaction in plant coke oxidation and its effect on coke oxidation activity was investigated theoretically. Plant coke was prepared by high temperature tube furnace and high purity nitrogen. The heat treatment temperature was set to 450520 鈩，

本文編號(hào)：2448761