本文選題：煤自燃 + 水浸煙煤��； 參考：《西安科技大學(xué)》2016年碩士論文

【摘要】：西部地區(qū)作為我國(guó)重要的能源戰(zhàn)略儲(chǔ)備地,煤炭資源儲(chǔ)量豐富,但是其中90%左右的煤質(zhì)為變質(zhì)程度較低的煙煤,且所開采煤層的自燃傾向性絕大部分為自燃或者易自燃煤層。在其下層工作面開采過(guò)程中,通常采用探水和疏水措施來(lái)防治采空區(qū)積水水害,這樣易形成漏風(fēng)供氧通道,使遺煤長(zhǎng)久處于浸水狀況,導(dǎo)致煤體發(fā)生變化,從而加大采空區(qū)浮煤氧化自燃危險(xiǎn)性,容易引起采空區(qū)內(nèi)遺煤的自燃。為了掌握水浸煙煤自燃機(jī)理,本文以西部典型礦區(qū)煙煤煤樣為主要研究對(duì)象,采用實(shí)驗(yàn)研究與理論分析相結(jié)合的方法,對(duì)原始煙煤煤樣與浸水干燥煙煤煤樣在低溫氧化過(guò)程中微觀物理結(jié)構(gòu)和化學(xué)結(jié)構(gòu)進(jìn)行綜合實(shí)驗(yàn)研究,探究水浸煙煤自燃微觀機(jī)理,對(duì)阻化及有效防治技術(shù)的研究具有重要的理論指導(dǎo)意義。借助工業(yè)分析實(shí)驗(yàn)、掃描電鏡實(shí)驗(yàn)及比表面積測(cè)定實(shí)驗(yàn)等,分析了煤樣的比表面積、總孔容和平均孔徑與煤樣自身變質(zhì)程度之間的關(guān)系,研究了原始煤樣和水浸干燥后煤樣的微觀表面物理結(jié)構(gòu),結(jié)果表明:水浸干燥后的煙煤其表面的孔隙和裂隙結(jié)構(gòu)增大且數(shù)量明顯增多,總孔容與比表面積相似較原始煙煤煤樣均有減小,平均孔徑增大,孔隙和裂隙連通性更好,有利于對(duì)氧氣的吸附,加大了煙煤的氧化自燃性。通過(guò)XRD衍射實(shí)驗(yàn),研究在三種不同實(shí)驗(yàn)條件下的原始煙煤和浸水干燥煙煤煤分子中的微觀晶體結(jié)構(gòu)特征的變化規(guī)律,得出煤的變質(zhì)程度、不同氧化溫度和煤樣本身粒度對(duì)水浸煙煤芳香微觀晶體結(jié)構(gòu)變化的影響規(guī)律。采用FTIR紅外光譜實(shí)驗(yàn),對(duì)原始煙煤及水浸干燥煙煤進(jìn)行不同變質(zhì)程度和不同氧化溫度的紅外光譜特征分析研究,結(jié)果表明:煤分子中含量最大官能團(tuán)的是含氧官能團(tuán),其次是脂肪烴和羥基,含量最小的官能團(tuán)是芳香烴;在低溫氧化過(guò)程的前期,水浸煤煤分子中的芳香核結(jié)構(gòu)相對(duì)比較穩(wěn)定,基本不參與復(fù)合反應(yīng),而脂肪烴和含氧官能團(tuán)的反應(yīng)活性較強(qiáng),其中的甲基、亞甲基、羧基、醚鍵和芳香醚氧鍵容易與氧發(fā)生復(fù)合反應(yīng),這些基團(tuán)可能是煤氧復(fù)合發(fā)生自燃的誘導(dǎo)因素,導(dǎo)致煤樣自燃的主要活性基團(tuán)。
[Abstract]:As an important strategic reserve of energy in China, the western region is rich in coal resources, but about 90% of the coal is bituminous coal with low metamorphism, and the spontaneous combustion tendency of the coal seams is mostly spontaneous combustion or spontaneous combustion. In the mining process of the lower coal face, water exploration and drainage measures are usually used to prevent the water damage in the goaf, which is easy to form the air leakage oxygen supply channel, make the residual coal in the water immersion condition for a long time, and cause the coal body to change. Therefore, the danger of oxidizing spontaneous combustion of floating coal in goaf is increased, and the spontaneous combustion of residual coal in goaf is easy to be caused. In order to understand the spontaneous combustion mechanism of water-immersed bituminous coal, this paper takes the bituminous coal samples of typical mining areas in the west as the main research object, and adopts the method of combining experimental research with theoretical analysis. The microphysical and chemical structures of raw bituminous coal samples and soaking dried bituminous coal samples during low temperature oxidation were studied, and the microscopic mechanism of spontaneous combustion of water-immersed bituminous coal was explored. It has important theoretical guiding significance for the research of blocking and effective prevention and cure technology. The relationship between the specific surface area, total pore volume and average pore size of coal samples and the degree of metamorphism of coal samples was analyzed by means of industrial analysis, scanning electron microscopy and specific surface area measurement. The microscopic surface physical structure of the raw coal sample and the coal sample after water leaching and drying are studied. The results show that the pore and fissure structure of the bituminous coal surface after water leaching and drying is increasing and the number of the bituminous coal surface is increasing obviously. Compared with the original bituminous coal, the total pore volume and specific surface area are similar to those of the original bituminous coal. The average pore size is increased, and the porosity and fracture connectivity are better, which is favorable to the adsorption of oxygen and increases the oxidation spontaneous combustion of bituminous coal. By means of XRD diffraction experiment, the changes of microcrystalline structure characteristics of raw bituminous coal and soaking dried bituminous coal in three different experimental conditions were studied, and the metamorphic degree of coal was obtained. The effect of oxidation temperature and coal particle size on the microstructure of aromatic bituminous coal is studied. The infrared spectrum characteristics of raw bituminous coal and water-immersed dried bituminous coal with different metamorphism and oxidation temperature were studied by FTIR infrared spectrum experiment. The results showed that the largest functional groups in coal molecules were oxygen-containing functional groups. The second is fatty hydrocarbon and hydroxyl group, and the least content is aromatic hydrocarbon. In the early stage of low temperature oxidation, the structure of aromatic nucleus in water-immersed coal is relatively stable and does not take part in the compound reaction. However, the reaction activity of fatty hydrocarbons and oxygen-containing functional groups is strong. Methyl, methylene, carboxyl, ether bond and aromatic ether oxygen bond are easy to react with oxygen. These groups may be the inducing factors of coal and oxygen compound spontaneous combustion. The main active groups leading to spontaneous combustion of coal samples.
【學(xué)位授予單位】：西安科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2016
【分類號(hào)】：TD752.2

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 董憲偉;王福生;孟亞寧;;煤的微觀孔隙結(jié)構(gòu)對(duì)其自燃傾向性的影響[J];煤炭科學(xué)技術(shù);2014年11期

2 張，

本文編號(hào)：1923357