本文選題：煤自燃 + 熱分析實驗��； 參考：《西安科技大學學報》2017年04期

【摘要】：為了研究煤的自燃特性,選取石圪臺煤礦22203采煤工作面煤樣為研究對象,采用熱分析技術,對煤氧化升溫過程中質量及動力學參數(shù)變化規(guī)律進行了探討。結果表明:煤的失重呈階段性變化規(guī)律,可分為低溫失重、吸氧增重、緩慢化學反應和燃燒階段;通過采用改進的KAS法計算煤升溫氧化動力學參數(shù),可知在溫度達到燃點前,隨著溫度升高反應活化能增加,說明不斷有難燃結構參與到反應。超過燃點溫度,在燃燒階段初期,活化能基本保持不變,而指前因子出現(xiàn)峰值,表明有大量活性結構被激活,準備參與到燃燒反應中。在燃燒階段中后期,活化能隨溫度的增加逐步減小,表明該階段有芳香環(huán)的破壞形成更易于反應的活性結構;動力學參數(shù)的補償效應存在顯著分段性,說明在煤氧反應過程中前后反應不同,其整體反應存在不止一個反應機理。研究結果對防治煤自燃提供理論依據(jù)。
[Abstract]:In order to study the spontaneous combustion characteristics of coal, the coal sample of 22203 coal face in Shigetai Coal Mine was selected as the research object, and the variation law of quality and dynamic parameters in the process of coal oxidation and heating was discussed by means of thermal analysis technology. The results show that the weight loss of coal varies in stages, which can be divided into low temperature weight loss, oxygen absorption, slow chemical reaction and combustion stage, and the modified KAS method is used to calculate the kinetic parameters of coal heating and oxidation, which shows that before the temperature reaches the ignition point, The activation energy of the reaction increases with the increase of temperature, which indicates that the refractory structure is continuously involved in the reaction. Above the ignition temperature, the activation energy remained basically unchanged at the beginning of the combustion stage, while the peak value of the pre-exponential factor showed that a large number of active structures were activated and were ready to participate in the combustion reaction. In the middle and late stage of combustion, the activation energy decreases gradually with the increase of temperature, which indicates that the destruction of aromatic rings in this stage leads to a more reactive active structure, and the compensatory effect of kinetic parameters is significantly piecewise. The results show that there is more than one reaction mechanism before and after coal oxygen reaction. The results provide theoretical basis for preventing coal spontaneous combustion.
【作者單位】： 西安科技大學安全科學與工程學院;教育部西部礦井開采及災害防治重點實驗室;
【基金】：國家自然科學基金(U1361129)
【分類號】：TD752.2

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