本文選題：水平管道　切入點(diǎn)：甲烷　出處：《中北大學(xué)》2013年碩士論文　論文類(lèi)型：學(xué)位論文

【摘要】：隨著我國(guó)城鎮(zhèn)化速度的加快，人們對(duì)煤炭的需求與消耗也與日俱增，煤炭開(kāi)采量增加。雖然國(guó)家對(duì)煤礦加強(qiáng)了監(jiān)督管理，增大了科技投入，但時(shí)有發(fā)生的重特大煤礦瓦斯、煤塵爆炸事故讓人觸目驚心，給人們?cè)斐闪司薮笊硇膫�，給國(guó)家造成巨大經(jīng)濟(jì)損失。由于煤礦巷道瓦斯和煤塵是共存的，所以本文利用長(zhǎng)0.7m、直徑140mm的密閉水平管道，對(duì)甲烷和煤塵混合爆炸產(chǎn)生的壓力和壓力上升速率進(jìn)行了詳細(xì)的試驗(yàn)研究，從而為煤礦瓦斯、煤塵爆炸防治提供理論基礎(chǔ)。 利用本試驗(yàn)裝置的試驗(yàn)結(jié)果表明： （1）在固定甲烷濃度的條件下，最大爆炸壓力值均隨著煤塵濃度的增加先增大后減小，存在一個(gè)峰值點(diǎn)，不同的甲烷濃度所對(duì)應(yīng)的產(chǎn)生此峰值點(diǎn)的煤塵濃度不同。最大壓力上升速率也出現(xiàn)了與最大爆炸壓力相同的規(guī)律；在煤塵濃度固定的條件下，復(fù)合爆炸最大爆炸壓力值隨甲烷濃度的增加先增大，后減小，出現(xiàn)峰值，峰值點(diǎn)對(duì)應(yīng)的最危險(xiǎn)的甲烷濃度均為5%。 （2）煤塵粒徑對(duì)甲烷-煤塵復(fù)合爆炸最大爆炸壓力和最大壓力上升速率有明顯影響。甲烷-煤塵復(fù)合爆炸最大爆炸壓力值和最大壓力上升速率值均隨著煤塵粒徑的減小而增大，煤塵粒徑在43μm～125μm范圍內(nèi)增大趨勢(shì)呈線(xiàn)性關(guān)系。 （3）點(diǎn)火延遲時(shí)間對(duì)甲烷-煤塵復(fù)合爆炸最大爆炸壓力和最大壓力上升速率有重要影響。點(diǎn)火延遲時(shí)間在50ms～120ms范圍內(nèi)，甲烷-煤塵復(fù)合爆炸最大爆炸壓力值和最大壓力上升速率值隨著點(diǎn)火延遲時(shí)間的增加先增大后減小，存在峰值點(diǎn)。煤塵粒徑不同，產(chǎn)生此峰值點(diǎn)的點(diǎn)火延遲時(shí)間不同。 （4）對(duì)實(shí)驗(yàn)數(shù)據(jù)進(jìn)行擬合，通過(guò)擬合方程可知：在一定范圍內(nèi)，甲烷-煤塵復(fù)合爆炸最大爆炸壓力（P_(max)）和最大壓力上升速率（dP/dT）_(max)與煤塵濃度（C_1）、煤塵粒徑（D）擬合方程分別滿(mǎn)足二次函數(shù)關(guān)系、線(xiàn)性關(guān)系；甲烷-煤塵復(fù)合爆炸最大爆炸壓力（P_(max)）與甲烷濃度（C_2）擬合方程滿(mǎn)足三次函數(shù)關(guān)系。 （5）通過(guò)甲烷-煤塵復(fù)合爆炸試驗(yàn)研究得知，在本試驗(yàn)裝置中甲烷-煤塵復(fù)合爆炸的最危險(xiǎn)條件是：甲烷濃度5%、煤塵濃度400g/m~3、煤塵粒徑43μm、點(diǎn)火延遲時(shí)間100ms，在此條件下，甲烷-煤塵復(fù)合爆炸最大爆炸壓力值可達(dá)0.69MPa，最大壓力上升速率值可達(dá)15.82MPa/s。
[Abstract]:With the acceleration of urbanization in our country, the demand and consumption of coal is increasing day by day, and the amount of coal mining is increasing. Although the state has strengthened the supervision and management of coal mines and increased the investment in science and technology, the gas in heavy and large coal mines that occur from time to time, Coal dust explosion accident is shocking, has caused great physical and mental injury to people, has caused huge economic loss to the country. Because the gas and coal dust in coal mine roadway coexist, so this paper uses the closed horizontal pipe which is 0.7m in length and 140 mm in diameter. The pressure and pressure rising rate caused by mixed explosion of methane and coal dust are studied in detail, which provides a theoretical basis for the prevention and control of coal mine gas and coal dust explosion. The experimental results show that:. 1) under the condition of fixed methane concentration, the maximum explosion pressure increases first and then decreases with the increase of coal dust concentration, and there exists a peak point. The concentration of coal dust corresponding to different methane concentrations is different. The maximum pressure rise rate is the same as the maximum explosion pressure, and under the condition of fixed coal dust concentration, With the increase of methane concentration, the maximum explosion pressure of the composite explosion increases first, then decreases, and reaches the peak value. The most dangerous methane concentration corresponding to the peak value is 5. (2) the particle size of coal dust has obvious influence on the maximum explosion pressure and the maximum pressure rising rate of methane coal dust composite explosion. The maximum explosion pressure value and the maximum pressure rise rate value of methane coal dust composite explosion increase with the decrease of coal dust particle size. The coal dust particle size increases linearly in the range of 43 渭 m ~ 125 渭 m. The ignition delay time has an important effect on the maximum explosion pressure and the maximum pressure rise rate in the methane-coal dust composite explosion. The ignition delay time is in the range of 50 Ms or 120 Ms. With the increase of ignition delay time, the maximum explosion pressure and the maximum pressure rise rate of methane coal dust composite explosion first increase and then decrease, and there is a peak point. The ignition delay time of the peak point is different with different particle size of coal dust. 4) fitting the experimental data, the fitting equation shows that: within a certain range, The maximum explosion pressure (PSP) and the maximum pressure rise rate (DP / D _ T _ (max)) of the methane-coal dust composite explosion are fitted to the quadratic function relation and the linear relationship respectively with the coal dust concentration (C _ (1)) and the coal dust particle size (D _ (1)). The maximum explosion pressure of methane-coal dust composite explosion (PSP) and methane concentration C _ (2)) fitted equation satisfies the cubic function relationship. The most dangerous conditions of methane-coal dust composite explosion in this experimental device are: methane concentration 5, coal dust concentration 400 g / m ~ (3), coal dust particle size 43 渭 m, ignition delay time 100 ms. in this test device, the most dangerous conditions are: methane concentration 5, coal dust concentration 400 g / m ~ (3), coal dust particle size 43 渭 m, ignition delay time 100 mm 路s ~ (-1). The maximum explosion pressure and the maximum pressure rise rate can reach 0.69 MPA and 15.82 MPA / s respectively.
【學(xué)位授予單位】：中北大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2013
【分類(lèi)號(hào)】：TD712.7;TD714.5

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