本文關(guān)鍵詞：煤礦井下封閉火區(qū)氣體生成及變化規(guī)律實(shí)驗(yàn)研究　出處：《太原理工大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 煤 煤自燃 程序升溫 封閉火區(qū) 氣體生成規(guī)律 灰色關(guān)聯(lián)性研究

【摘要】：礦井火災(zāi)是煤礦井下特別嚴(yán)重的災(zāi)害之一,也是瓦斯爆炸等礦井重大事故的主要誘因。我國(guó)每年因?yàn)榈V井火災(zāi)及其引起的其他事故造成重大的資源浪費(fèi)、環(huán)境污染和人員傷亡。因此研究礦井火災(zāi)發(fā)生以及熄滅的過(guò)程有著重大的意義。本文通過(guò)自行設(shè)計(jì)改裝的煤礦井下封閉火區(qū)模擬實(shí)驗(yàn)裝置,選用西山焦煤和平朔長(zhǎng)焰煤兩種煤樣分析了從煤自燃到火區(qū)封閉后熄滅的整個(gè)過(guò)程。因?yàn)闅怏w釋放是煤燃燒主要外在表現(xiàn)特征之一,因此本文在煤自燃階段分別研究了程序升溫和煤體自熱兩個(gè)階段的氣體生成變化規(guī)律及關(guān)聯(lián)性。在火區(qū)封閉后熄滅階段主要分析了幾種氣體的釋放變化規(guī)律及關(guān)聯(lián)性研究,并對(duì)適合作為觀測(cè)封閉火區(qū)熄滅情況的幾種指標(biāo)氣體應(yīng)用灰色理論作與溫度的關(guān)聯(lián)性研究。得出以下幾個(gè)主要結(jié)論:(1)在煤低溫氧化過(guò)程中耗氧速率在某個(gè)臨界溫度點(diǎn)之前,隨著溫度增加有逐漸增大的趨勢(shì),在某個(gè)臨界溫度點(diǎn)后耗氧速率跨越式增大。這說(shuō)明,在煤的自燃過(guò)程中,耗氧速率伴隨著煤溫的增大而增高,當(dāng)煤體臨界溫度到達(dá)某個(gè)點(diǎn)是時(shí)出現(xiàn)耗氧速率跳越是變大的現(xiàn)象,這個(gè)溫度點(diǎn)是煤自燃達(dá)到劇烈階段的臨界點(diǎn)。(2)在煤自燃20℃到500℃的過(guò)程中,煤樣復(fù)合反應(yīng)可能呈現(xiàn)階段性,20℃—80℃、80℃—180℃、180℃—300℃、300℃—500℃。80℃左右這個(gè)溫度點(diǎn)是煤體從緩慢氧化階段到較為激烈氧化的過(guò)渡點(diǎn),180℃左右是煤體由較為激烈氧化階段到激烈氧化階段的轉(zhuǎn)折點(diǎn),300℃左右為煤體的燃點(diǎn)。(3)在煤低溫氧化過(guò)程中CO/△O_2值隨溫度為穩(wěn)定的線性增長(zhǎng)趨勢(shì)。CO/CO_2值隨的增加溫度在整體趨勢(shì)上增大,在80℃之前CO/CO_2值隨溫度增加平穩(wěn),80℃之后開(kāi)始急劇增加。在煤低溫氧化過(guò)程中CO_2濃度至少是CO濃度的5倍。(4)在本實(shí)驗(yàn)條件下,從250℃到30℃溫度下降的過(guò)程中H_2濃度、CO濃度、指CH_4釋放量,H_2與CO差值都呈現(xiàn)指數(shù)下降的趨勢(shì)。在封閉火區(qū)C_2H_4和C_2H_6的濃度隨溫度的降低總體為下降的趨勢(shì),在130℃左右時(shí)兩種煤樣C_2H_4的釋放量已經(jīng)為零,在110℃以后兩種煤樣C_2H_6釋放量變?yōu)榱恪?5)通過(guò)對(duì)兩種煤樣進(jìn)行灰色關(guān)聯(lián)性分析得出西山焦煤第一指標(biāo)氣體為CO,第二為H_2,第三為CO/CO_2值,第四為H_2與CO差值,C_2H_4和C_2H_6排在最后。平朔長(zhǎng)焰煤第一為CO/CO_2值,第二為CO,第三為H_2與CO差值、第四為H_2,第四第五為C_2H_6和C_2H_4。
[Abstract]:Mine fire is one of the most serious disasters in coal mine, and it is also the main cause of major accidents such as gas explosion. Every year, mine fire and other accidents caused by mine cause great waste of resources, environmental pollution and casualties. Therefore, it is of great significance to study the process of mine fire and the process of extinguishing. This paper designed and modified coal mine closed fire zone simulation experiment device, analyzes the whole process from spontaneous combustion of coal to fire extinguished after closed selection of Xishan Coal and Pingshuo Coal long flame coal two. Because gas emission is one of the main external characteristics of coal combustion. In this paper, the gas generation and change rules and correlation in two stages of programmed heating and coal self heating are studied in the stage of coal spontaneous combustion. In the closed fire extinguished after the stage mainly analyzes several gases variation and association studies, and the application of several index theory for gas sealed fire extinguished the grey observation and correlation of temperature. The following conclusions are drawn: (1) in the process of low temperature oxidation of coal, the oxygen consumption rate increases gradually with the increase of temperature before a critical temperature point, and at a critical temperature point, the oxygen consumption rate increases by leaps and bounds. This shows that, in the process of coal spontaneous combustion, the oxygen consumption rate with the increase of coal temperature increases, when the coal temperature reaches a point when there is oxygen consumption rate jump is larger, the temperature is the critical point of spontaneous combustion of coal reached intense stage. (2) during the process of 20 to 500 degrees coal spontaneous combustion, the coal sample reaction may be staged at 20, 80, 80, 180, 180, 300, and 500. The temperature point at 80 C is the transition point from the slow oxidation stage to the more intense oxidation stage. About 180 C is the turning point of the coal from the intense oxidation stage to the intense oxidation stage, and the ignition point of the coal is about 300 C. (3) in the process of coal oxidation at low temperature in the CO/ Delta O_2 value temperature stable linear growth trend. The increasing temperature of the CO/CO_2 value increases in the overall trend, and the CO/CO_2 value increases steadily with the temperature before 80 C, and then increases sharply after 80. In the process of low temperature oxidation of coal, the concentration of CO_2 is at least 5 times that of the concentration of CO. (4) under the experimental conditions, H_2 concentration, CO concentration, CH_4 release and H_2 and CO difference showed an exponential decline from 250 to 30 C. The concentration of C_2H_4 and C_2H_6 in closed fire zone decreases with temperature for the overall downward trend, at about 130 DEG C when the release amount of two coal samples of C_2H_4 has zero in 110 C two coal samples of C_2H_6 release quantity zero. (5) through the grey correlation analysis of two kinds of coal samples, it is concluded that the first index gas of Xishan coking coal is CO, the second is H_2, third is CO/CO_2 value, fourth is the difference between H_2 and CO, C_2H_4 and C_2H_6 are at the end. In the long flame coal first for CO/CO_2 value, the second CO, third H_2 and fourth CO difference, H_2, fourth and fifth for C_2H_6 and C_2H_4.
【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】：2017
【分類號(hào)】：TD752

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 鄧軍;趙婧昱;張[?妮;;基于指標(biāo)氣體增長(zhǎng)率分析法測(cè)定煤自燃特征溫度[J];煤炭科學(xué)技術(shù);2014年07期

2 姬俊燕;鄔劍明;周春山;王涌宇;;限定封閉空間內(nèi)基于CO濃度的煤低溫氧化反應(yīng)特性的試驗(yàn)研究[J];煤礦安全;2014年06期

3 王涌宇;張玉龍;王俊峰;鄔劍明;;限定封閉環(huán)境煤粒徑對(duì)煤氧化反應(yīng)速度的影響[J];煤礦安全;2014年05期

4 姬戰(zhàn)鎖;姜元?jiǎng)?;基于灰色關(guān)聯(lián)度法對(duì)錢(qián)家營(yíng)礦煤自燃指標(biāo)氣體的分析[J];水力采煤與管道運(yùn)輸;2012年02期

5 謝和平;劉虹;吳剛;;煤炭對(duì)國(guó)民經(jīng)濟(jì)發(fā)展貢獻(xiàn)的定量分析[J];中國(guó)能源;2012年04期

6 賈寶山;溫海燕;梁運(yùn)濤;王小云;;受限空間瓦斯爆炸與氫氣促進(jìn)機(jī)理研究[J];中國(guó)安全科學(xué)學(xué)報(bào);2012年02期

7 郭小云;王德明;李金帥;;煤低溫氧化階段氣體吸附與解析過(guò)程特性研究[J];煤炭工程;2011年05期

8 肖e，

本文編號(hào)：1345499