本文選題：次生CO + 產(chǎn)生規(guī)律　； 參考：《河南理工大學(xué)》2016年碩士論文

【摘要】：一氧化碳(CO)是煤自燃?xì)怏w產(chǎn)物之一,也是目前我國(guó)大多數(shù)煤礦用來(lái)預(yù)報(bào)煤自然發(fā)火的標(biāo)志氣體。然而諸多煤礦現(xiàn)場(chǎng)觀測(cè)結(jié)果發(fā)現(xiàn)CO經(jīng)常異常超限但并未發(fā)生煤自燃情況,因此有效辨識(shí)井下CO氣體來(lái)源,了解其產(chǎn)生規(guī)律,將對(duì)提高井下煤自燃預(yù)報(bào)準(zhǔn)確度有著重要指導(dǎo)意義。論文利用自行設(shè)計(jì)的煤體破碎實(shí)驗(yàn)平臺(tái),以內(nèi)蒙長(zhǎng)焰煤為研究對(duì)象,從煤樣質(zhì)量和電機(jī)轉(zhuǎn)速兩方面研究了因煤結(jié)構(gòu)破壞分解產(chǎn)生CO(S-CO)產(chǎn)生規(guī)律及溫度變化規(guī)律,結(jié)果表明:在煤樣破碎過(guò)程中,各工況S-CO出現(xiàn)時(shí)間和溫升開(kāi)始變化時(shí)間受煤樣質(zhì)量和電機(jī)轉(zhuǎn)速影響不明顯,但是在電機(jī)轉(zhuǎn)速?gòu)?5000r/min降低到10000r/min時(shí),S-CO和溫升出現(xiàn)時(shí)間會(huì)分別明顯推遲50s和70s左右,各工況S-CO平均產(chǎn)生速率和最大濃度均隨著電機(jī)轉(zhuǎn)速和煤樣質(zhì)量增加而增加,溫升隨電機(jī)轉(zhuǎn)速增加變化明顯,受煤樣質(zhì)量影響并不明顯。S-CO濃度變化過(guò)程可隨破碎時(shí)間分為無(wú)S-CO產(chǎn)生階段、S-CO呈線性增長(zhǎng)階段和S-CO呈類指數(shù)增長(zhǎng)階段。對(duì)各工況破碎后煤樣繼續(xù)開(kāi)展紅外光譜實(shí)驗(yàn),結(jié)合傅里葉變換紅外光譜法研究了S-CO產(chǎn)生機(jī)理,通過(guò)對(duì)煤體破碎過(guò)程中表面官能團(tuán)及化學(xué)鍵變化情況分析,認(rèn)為S-CO主要產(chǎn)生于破碎初期煤結(jié)構(gòu)破壞引發(fā)的羧酸、醚、過(guò)氧化物斷裂和破碎后期隨著刀片做功內(nèi)能增大,羧基、雜氧鍵、過(guò)氧鍵、醚鍵、羥基等含氧官能團(tuán)活化分解釋放S-CO。通過(guò)對(duì)煤體破碎實(shí)驗(yàn)數(shù)據(jù)算術(shù)分析,研究了實(shí)驗(yàn)條件下各工況S-CO絕對(duì)產(chǎn)生量和平均產(chǎn)生速率,推導(dǎo)出S-CO絕對(duì)產(chǎn)生量與煤樣質(zhì)量之間量化關(guān)系式。利用最小二乘法對(duì)S-CO平均產(chǎn)生速率和溫升進(jìn)行了相關(guān)性分析,R2為0.8633,表明S-CO平均產(chǎn)生速率和溫升的相關(guān)性較強(qiáng)。建立了開(kāi)采工作面S-CO濃度計(jì)算模型,推導(dǎo)出開(kāi)采過(guò)程中S-CO濃度計(jì)算方法,并利用計(jì)算公式對(duì)工作面CO濃度和CO濃度變化速率進(jìn)行修正。
[Abstract]:Carbon monoxide (CO) is one of the products of coal spontaneous combustion, and it is also the symbol gas used to predict the spontaneous combustion of coal in most coal mines in China. However, many coal mine field observation results show that CO often exceeds the limit, but no spontaneous combustion of coal occurs. Therefore, it is important to identify the underground CO gas source and understand its production law, which will be of great significance to improve the prediction accuracy of underground coal spontaneous combustion. In this paper, based on the experimental platform of coal fragmentation designed by ourselves and taking long flame coal in Inner Mongolia as the research object, the law of CO-S-CO-producing and the law of temperature change due to the decomposition of coal structure are studied from two aspects of coal sample quality and motor speed. The results show that in the process of coal sample crushing, the time of S-CO appearance and the change time of temperature rise are not obviously affected by coal sample quality and motor speed. However, when the speed of motor is reduced from 15000r/min to 10000r/min, the emergence time of S-CO and temperature rise will be obviously delayed about 50s and 70s, respectively. The average rate and maximum concentration of S-CO in each working condition will increase with the increase of motor speed and coal sample mass. The temperature rise changes obviously with the increase of motor speed, and the change process of S-CO concentration is not obviously affected by coal sample mass. The change process of S-CO concentration can be divided into linear growth stage and S-CO exponential growth stage with breaking time. The infrared spectrum experiments were carried out on the coal samples after crushing under various conditions. The mechanism of S-CO production was studied by means of Fourier transform infrared spectroscopy. The changes of surface functional groups and chemical bonds in the process of coal crushing were analyzed. It is considered that S-CO mainly comes from carboxylic acid, ether, peroxide breakage and late breakage caused by coal structure destruction in the early stage of crushing. The activation decomposition of carboxyl, hetero, superoxide, ether, hydroxyl and other oxygen-containing functional groups releases S-COs with the increase of the energy in the blade work. Based on the arithmetic analysis of the experimental data of coal body crushing, the absolute production rate and the average production rate of S-CO under different conditions are studied, and the quantitative relationship between the absolute production of S-CO and the quality of coal sample is derived. The correlation analysis between the average rate of S-CO production and temperature rise was carried out by using the least square method. The R2 was 0.8633, which indicated that the average production rate of S-CO had a strong correlation with temperature rise. The calculation model of S-CO concentration in mining face is established, the calculation method of S-CO concentration in mining process is deduced, and the change rate of CO concentration and CO concentration in working face are modified by using the calculation formula.
【學(xué)位授予單位】：河南理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2016
【分類號(hào)】：TD752.2

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