【摘要】：為探究煤自燃過程的反應(yīng)特征與預(yù)測煤自燃臨界溫度,對5種煤樣進行了絕熱氧化實驗,采用煤樣活化能指標(biāo)在實驗不同時間段的變化情況來表征煤低溫氧化內(nèi)在特征。然后運用線性回歸性分析模型中線性顯著性檢驗來確定臨界溫度點Tc。結(jié)果表明:實驗初期煤樣活化能波動范圍極大,隨著溫度升高活化能趨于穩(wěn)定,在實驗后期,各煤樣求得的活化能均處于55~70kJ/mol范圍內(nèi),反映了煤低溫氧化反應(yīng)是由不穩(wěn)定逐步過渡到相對穩(wěn)定的過程;Tc與宏觀升溫速率突變范圍相符合,驗證了模型的準(zhǔn)確性;同時Tc與實驗中自熱溫度達到160℃所需時間t0自發(fā)呈線性關(guān)系,因此可以用絕熱氧化裝置測得t0來預(yù)測煤自燃臨界點。研究成果可以對礦區(qū)防滅火和煤炭儲運管理工作提供借鑒。
[Abstract]:In order to explore the reaction characteristics of coal spontaneous combustion process and predict the critical temperature of coal spontaneous combustion, adiabatic oxidation experiments were carried out on five kinds of coal samples. The intrinsic characteristics of low temperature oxidation of coal were characterized by the change of activation energy index of coal samples in different time periods of the experiment. Then the critical temperature point Tc. is determined by linear significance test in the linear regression analysis model. The results show that the activation energy of coal samples fluctuates greatly at the initial stage of the experiment, and the activation energy tends to be stable with the increase of temperature. At the later stage of the experiment, the activation energies obtained from each coal sample are in the range of 55~70kJ/mol. The results show that the low temperature oxidation of coal is a process of transition from instability to relative stability. The Tc is consistent with the abrupt range of macro-heating rate, and the accuracy of the model is verified. At the same time, there is a linear relationship between Tc and the time of self-heating temperature of 160 鈩，

本文編號：2431423