本文選題：恒溫氧化　切入點(diǎn)：宏觀特點(diǎn)　出處：《太原理工大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

【摘要】：我國(guó)大部分煤層屬于自燃煤層,煤氧化引起的自燃火災(zāi)不僅浪費(fèi)礦產(chǎn)資源,而且造成環(huán)境污染,并嚴(yán)重威脅礦井的安全生產(chǎn)[14]。本論文采用實(shí)驗(yàn)處理與理論分析的方法,針對(duì)不同煤種的低溫氧化階段,研究煤恒溫氧化過(guò)程的氣體生成規(guī)律與微觀官能團(tuán)變化特征,同時(shí)從宏觀與微觀兩個(gè)角度揭示煤氧化機(jī)理,對(duì)預(yù)防與治理煤氧化自燃具有重要的意義。 利用恒溫裝置系統(tǒng)與氣相色譜儀,對(duì)不同種煤樣在不同粒徑、不同質(zhì)量條件下進(jìn)行恒溫氧化實(shí)驗(yàn)。通過(guò)分析不同氧化時(shí)間的耗氧速率、CO生成速率等特定參數(shù),得出不同條件下煤低溫氧化階段的氣體產(chǎn)物特征和變化趨勢(shì),并根據(jù)煤樣反應(yīng)罐內(nèi)氧氣濃度變化情況,得出不同粒徑、不同質(zhì)量、不同煤種條件下煤低溫氧化過(guò)程隨氧氣濃度的變化規(guī)律,并定量的標(biāo)定不同變量條件下,煤樣耗氧速率、CO生成速率與恒溫氧化時(shí)間的關(guān)系,分析低溫下煤氧化反應(yīng)的基本機(jī)理,從而掌握煤氧化過(guò)程的本質(zhì)宏觀變化規(guī)律。 與此同時(shí),通過(guò)傅里葉紅外光譜實(shí)驗(yàn),對(duì)不同變質(zhì)程度、不同粒徑、不同恒溫氧化時(shí)間煤樣的紅外光譜特征進(jìn)行了分析與研究,從微觀角度分析了不同條件下煤分子中羥基、羰基、芳香烴的等官能團(tuán)的變化趨勢(shì),得出了煤分子中活性基團(tuán)含量的差別,造成了煤分子化學(xué)結(jié)構(gòu)上的不同,從煤內(nèi)在屬性上決定了其氧化自燃的難易程度[1]。 煤氧復(fù)合反應(yīng)是個(gè)整體系統(tǒng),煤氧化進(jìn)程的外在宏觀現(xiàn)象與煤內(nèi)在分子官能團(tuán)變化均反應(yīng)出煤氧化特點(diǎn)與反應(yīng)規(guī)律,通過(guò)對(duì)氣體參數(shù)的微觀分析,研究了不同煤樣宏觀氣體生成規(guī)律與其微觀特征變化之間的對(duì)應(yīng)關(guān)系,得出了煤氧化過(guò)程特定氣體參數(shù)的微觀解釋,同時(shí)從宏觀與微觀兩個(gè)角度解釋,驗(yàn)證煤氧化反應(yīng)過(guò)程中現(xiàn)象與參數(shù)的變化情況,進(jìn)一步的掌握低溫條件下煤氧化過(guò)程的發(fā)展規(guī)律,為拓展煤自燃的評(píng)價(jià)指標(biāo)體系與完善煤自燃的防治工作提供了理論基礎(chǔ)與技術(shù)保障。
[Abstract]:Most coal beds in China belong to spontaneous combustion coal seams. Spontaneous combustion fires caused by coal oxidation not only waste mineral resources, but also cause environmental pollution, and seriously threaten the safety of mine production. [14] this paper adopts the methods of experimental treatment and theoretical analysis. In view of the low temperature oxidation stage of different kinds of coal, the formation law of gas and the change characteristics of micro functional groups in the process of constant temperature oxidation of coal are studied. At the same time, the oxidation mechanism of coal is revealed from both macroscopic and micro angles. It is of great significance to prevent and control coal oxidation spontaneous combustion. The constant temperature oxidation experiments were carried out on different coal samples under different particle size and different quality by using constant temperature equipment system and gas chromatograph. The specific parameters such as oxygen consumption rate and CO formation rate of different oxidation time were analyzed. The characteristics and trends of gas products in the low temperature oxidation stage of coal under different conditions were obtained. According to the change of oxygen concentration in the coal sample reaction tank, different particle sizes and different mass were obtained. The relationship between the rate of CO formation and the oxidation time of coal at constant temperature is quantitatively calibrated under different coal conditions, and the basic mechanism of oxidation reaction of coal at low temperature is analyzed. In order to grasp the essence of the coal oxidation process macro-change law. At the same time, the infrared spectra of coal samples with different degrees of metamorphism, different particle sizes and different oxidation time at constant temperature were analyzed and studied by Fourier transform infrared spectroscopy (FTIR). The hydroxyl groups in coal molecules under different conditions were analyzed from the microcosmic point of view. The variation trend of isofunctional groups of carbonyl and aromatic hydrocarbons, the difference of active group content in coal molecules is obtained, which leads to the difference in molecular chemical structure of coal, which determines the degree of difficulty in oxidation spontaneous combustion of coal from the intrinsic properties of coal [1]. Coal-oxygen complex reaction is an integral system. Both the external macroscopic phenomena of coal oxidation process and the changes of internal molecular functional groups of coal reflect the characteristics and law of coal oxidation. In this paper, the corresponding relation between the macroscopic gas generation law of different coal samples and the change of their microscopic characteristics is studied, and the microscopic interpretation of the specific gas parameters in the coal oxidation process is obtained, which is explained from both macroscopic and microscopic angles. To verify the changes of the phenomena and parameters in the coal oxidation reaction process, and to further master the development law of the coal oxidation process under the low temperature conditions. It provides the theoretical basis and technical guarantee for expanding the evaluation index system of coal spontaneous combustion and perfecting the prevention and cure work of coal spontaneous combustion.
【學(xué)位授予單位】：太原理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TD752.2

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本文編號(hào)：1636407