發(fā)布時間：2018-04-28 17:57

  本文選題：煤自燃 + 宏觀表征參數(shù)　； 參考：《西安科技大學(xué)》2014年博士論文

【摘要】：煤炭自燃嚴重威著礦井的安全生產(chǎn)，近年來，煤自燃特性的定量表征及危險程度的準確判定是煤礦安全領(lǐng)域研究的熱點和難點。 論文圍繞煤自燃性表征參數(shù)獲取方法進行研究，在煤氧吸附與自燃特性理論研究基礎(chǔ)上，確定了煤自燃的主要宏觀表征參數(shù)，自行設(shè)計建立了公斤級煤量自然發(fā)火實驗裝置，提出了煤自燃傾向性和自然發(fā)火期實驗測試的新方法，通過對黃陵2號煤的實驗測試分析，得出煤自燃宏觀表征參數(shù)，確定了規(guī)范的實驗條件，并與大型煤自然發(fā)火實驗和程序升溫實驗的對比分析表明，，該實驗裝置綜合了上述兩類實驗系統(tǒng)的優(yōu)點，具有快速、準確測定煤自燃宏觀表征參數(shù)的特點，為煤自燃特性和自然發(fā)火期實驗測定標準制定提供了理論和實驗基礎(chǔ)。取得主要創(chuàng)新性成果如下： （1）基于煤的孔隙結(jié)構(gòu)及煤對氧的吸附類型和熱量關(guān)系，分析煤低溫氧化時不同類型吸附在煤氧化自熱過程中的作用，結(jié)合煤發(fā)火規(guī)律及其影響因素，運用多孔介質(zhì)滲流力學(xué)和傳熱傳質(zhì)學(xué)理論及相關(guān)的數(shù)學(xué)模型，確定了煤氧化自熱過程中數(shù)值計算的關(guān)鍵參數(shù)：煤的耗氧速度、放熱強度，為煤自燃性表征參數(shù)測試方法提供了理論支持。 （2）結(jié)合破碎煤體的放熱和散熱特性，從煤量、絕熱條件、控制精度及相應(yīng)軟硬件等方面分析了實驗要求。研究創(chuàng)建了公斤級煤量自然發(fā)火實驗裝置，裝置的熱量散失值能夠滿足煤氧化升溫的條件，實現(xiàn)了7.1kg煤量煤自然氧化升溫過程實驗?zāi)M，解決了大煤量自然發(fā)火實驗工作量大，小煤量實驗需外部加熱且不能真實模擬煤氧化自熱過程的問題。 （3）利用公斤級煤量自然發(fā)火實驗臺對黃陵2號煤進行了測試，得到了自然發(fā)火過程中氣體和溫度變化關(guān)系，結(jié)合指標氣體濃度及其變化率、氣體濃度比值等表征參數(shù)與煤溫的對應(yīng)關(guān)系，確定了煤低溫氧化自然發(fā)火過程中的三個特征溫度，及其量化判定依據(jù)，解決了應(yīng)用指標氣體量化識別煤層自燃隱蔽火源溫度的問題。 （4）在公斤級煤量自然發(fā)火實驗測試基礎(chǔ)上，計算得出了黃陵2號煤樣的放熱強度、耗氧速度和實驗自然發(fā)火期等自燃特性參數(shù)，擬合出煤氧復(fù)合作用過程中自燃宏觀表征參數(shù)與溫度的函數(shù)關(guān)系，確定了常數(shù)項，為煤自然發(fā)火的數(shù)值模擬和發(fā)火期計算提供了關(guān)鍵參數(shù)。 （5）通過與大型（西安科技大學(xué)XK-III）和程序升溫實驗臺進行實驗對比分析表明，公斤級煤量自然發(fā)火實驗可以用于煤自然發(fā)火過程測試、煤自燃表征參數(shù)的準確測定以及煤的自燃傾向性確定，對現(xiàn)場自然發(fā)火預(yù)測預(yù)報及自燃危險性判定有重要意義。
[Abstract]:In recent years, the quantitative characterization of spontaneous combustion characteristics of coal and the accurate determination of the risk degree of coal spontaneous combustion are the hot and difficult points in the field of coal mine safety.
On the basis of the theoretical study of coal oxygen adsorption and spontaneous combustion characteristics, the main macroscopic characterization parameters of coal spontaneous combustion are determined, and an experimental device for spontaneous combustion of kilogram grade coal is designed, and a new method of experimental testing of spontaneous combustion of coal and natural ignition period is proposed. The experimental test analysis of No. 2 coal in Huangling has obtained the macroscopic characterization parameters of coal spontaneous combustion, determined the standard experimental conditions, and compared with the natural ignition experiment of large coal and the temperature programmed experiment, which shows that the experimental device combines the advantages of the above two kinds of experimental systems, and has the characteristics of fast speed and accurate determination of the macroscopic characterization parameters of coal spontaneous combustion. The standard of coal spontaneous combustion and experimental determination of spontaneous combustion period provides theoretical and experimental basis. The main innovative achievements are as follows:
(1) based on the pore structure of coal and the relationship between the adsorption type and heat of coal to oxygen, the effect of different types of coal on coal oxidation and self heat during the low temperature oxidation of coal is analyzed, and the coal oxidation and heat and mass transfer theory and the related mathematical model are used to determine the self heat process of coal oxidation, combining the law of coal ignition and its influencing factors. The key parameters of the numerical calculation are the oxygen consumption rate and the heat release intensity of coal, which provide theoretical support for the testing method of the characterization parameters of coal spontaneous combustion.
(2) combined with the heat release and heat dissipation characteristics of broken coal, the experimental requirements were analyzed from coal quantity, adiabatic condition, control precision and corresponding software and hardware. The experiment set up a kilogram grade coal spontaneous combustion experiment device, the heat dissipation value of the device could satisfy the heating of coal oxidation, and realized the experiment of natural oxidation temperature rising of coal 7.1kg coal. The simulation has solved the problem of large amount of coal spontaneous combustion, large amount of experimental work, small coal quantity need external heating, and can not really simulate the oxidation and self heating process of coal.
(3) to test the coal of Huangling No. 2 by a kilogram grade coal spontaneous combustion test platform, the relationship between gas and temperature changes during the spontaneous combustion process is obtained, and the corresponding relation between the parameters of the index gas concentration and its change rate, the ratio of gas concentration and the coal temperature is obtained, and the three characteristic temperatures in the process of spontaneous combustion of coal at low temperature oxidation are determined. And its quantitative determination basis solves the problem of identifying the hidden fire source temperature of coal spontaneous combustion by using indicator gas quantification.
(4) on the basis of the natural ignition test of the kilogram grade coal, the parameters of the spontaneous combustion characteristics such as the exothermic intensity, the oxygen consumption rate and the natural ignition period of the coal sample No. 2 of Huangling are calculated, and the function relation between the macroscopic characterization parameters of spontaneous combustion of coal and the temperature is fitted out, and the constant term is determined, which is the numerical simulation of the spontaneous combustion of coal. The calculation of the firing period provided the key parameters.
(5) through the comparison and analysis with the large scale (Xi'an University of Science And Technology XK-III) and the temperature programmed test bench, it is shown that the natural firing experiment of kilogram grade coal can be used to test the spontaneous combustion process of coal, the accurate measurement of coal spontaneous combustion characterization parameters and the determination of coal spontaneous combustion tendency, the prediction of spontaneous combustion of coal and the determination of the risk of spontaneous combustion. It is of great significance.

【學(xué)位授予單位】：西安科技大學(xué)
【學(xué)位級別】：博士
【學(xué)位授予年份】：2014
【分類號】：TD752.2

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