本文選題：含甲烷氣體 + 氣體輸出裝置�。� 參考：《中國礦業(yè)大學》2015年碩士論文

【摘要】：煤自燃和瓦斯是影響煤礦安全的主要災(zāi)害,在對高瓦斯易自燃煤層進行開采時,會有大量的瓦斯涌出,而采空區(qū)漏風流中含有一定量的瓦斯,氧氣濃度也低于正常大氣中的氧氣濃度,煤自燃發(fā)火也是在該氣體環(huán)境中發(fā)生。本文以陽煤集團石港煤礦為例,對其含甲烷供氣條件下煤低溫氧化特性進行實驗研究。針對高瓦斯采空區(qū)中含有氧氣、氮氣和甲烷的實際情況,需配制含有易燃易爆氣體的混合氣體,提出了四種設(shè)計方案并對其進行分析優(yōu)化,研制了含甲烷氣體配比及輸出實驗裝置。通過對實驗裝置進行參數(shù)優(yōu)化實驗,確定了最佳實驗參數(shù),驗證了該裝置的設(shè)計合理性和安全性,為煤低溫氧化實驗的進行提供了保障。開展了含甲烷供氣條件下煤低溫氧化產(chǎn)物實驗,理論上分析了氧化產(chǎn)物的生成規(guī)律及煤低溫氧化的過程,解釋煤低溫氧化過程中氧化產(chǎn)物的變化規(guī)律。得到在低氧高甲烷濃度的風流中,煤氧化產(chǎn)物的初始生成溫度有“延遲效應(yīng)”,氧化產(chǎn)物生成的初始溫度滯后,為預(yù)測采空區(qū)煤自燃提供了參考依據(jù)。在符合石港煤礦實際情況的含瓦斯氣體環(huán)境中,優(yōu)選出了煤自燃早期預(yù)報的標志性氣體。結(jié)果表明CO和C2H4氣體可作為高瓦斯采空區(qū)煤自燃的指標氣體。采用紅外光譜儀分析了含甲烷供氣條件下煤低溫氧化過程中官能團種類和數(shù)量的變化規(guī)律。氧氮比較高時,高濃度的甲烷對含氧官能團的變化有抑制作用;隨氧氮比例降低,含氧官能團反應(yīng)也受到抑制,但甲烷體積分數(shù)對含氧官能團的數(shù)量變化無明顯影響,脂肪烴官能團的生成速率隨氧氮比降低而減小。芳環(huán)則相對穩(wěn)定,基本不受氧氣和甲烷濃度的影響。隨氧化溫度的升高,各基團種類和數(shù)量的變化是導致氣體產(chǎn)物生成和變化規(guī)律的根本原因所在。論文研究成果為石港煤礦自燃過程的預(yù)測預(yù)報提供有力依據(jù),利于制定有效的防滅火措施,并為采空區(qū)遺煤的自燃特性及煤的氧化反應(yīng)機理研究提供新的角度。
[Abstract]:Spontaneous combustion of coal and gas are the main disasters that affect the safety of coal mine. When the coal seam with high gas is easy to burn, there will be a large amount of gas gushing out, and there is a certain amount of gas in the leaking air flow in the goaf. The oxygen concentration is also lower than that in the normal atmosphere, and the spontaneous combustion of coal also occurs in the gas environment. This paper takes Shigang Coal Mine of Yangshan Coal Group as an example to study the characteristics of coal oxidation at low temperature under the condition of methane supply. In view of the fact that there are oxygen, nitrogen and methane in high gas goaf, it is necessary to prepare the mixed gas containing flammable and explosive gas. Four design schemes are put forward and analyzed and optimized. An experimental device for the proportion and output of methane gas was developed. Through the parameter optimization experiment of the experimental device, the optimum experimental parameters are determined, and the design rationality and safety of the device are verified, which provides the guarantee for the low temperature oxidation experiment of coal. Experiments were carried out on the low temperature oxidation products of coal under the condition of methane supply. The formation law of the oxidation products and the process of coal low temperature oxidation were analyzed theoretically, and the variation law of the oxidation products in the low temperature oxidation process of coal was explained. In the air flow with low oxygen and high methane concentration, the initial formation temperature of coal oxidation product has "delay effect" and the initial temperature of oxidation product formation lags behind, which provides a reference for predicting coal spontaneous combustion in goaf. In accordance with the actual situation of Shigang coal mine gas environment, the early prediction of coal spontaneous combustion of the iconic gas is selected. The results show that CO and C2H4 gas can be used as index gas of coal spontaneous combustion in high gas goaf. The variety of functional groups in the process of coal oxidation at low temperature under the condition of methane supply was analyzed by infrared spectrometer. When oxygen and nitrogen were high, the changes of oxygen functional groups were inhibited by high concentration of methane, and the reaction of oxygen functional groups was inhibited with the decrease of oxygen nitrogen ratio, but the volume fraction of methane had no significant effect on the changes of the number of oxygen functional groups. The formation rate of functional groups of aliphatic hydrocarbons decreased with the decrease of oxygen to nitrogen ratio. Aromatic rings are relatively stable and are not affected by the concentration of oxygen and methane. With the increase of oxidation temperature, the change of group species and quantity is the fundamental reason for the formation and variation of gas products. The research results provide a powerful basis for the prediction and prediction of spontaneous combustion process in Shigang coal mine, which is conducive to the formulation of effective fire prevention measures, and provides a new angle for the study of spontaneous combustion characteristics and oxidation reaction mechanism of coal left over in goaf.
【學位授予單位】：中國礦業(yè)大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TD752.2

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本文編號：1780351