發(fā)布時間：2018-06-18 12:51

  本文選題：礦井火災(zāi) + 傾斜巷道��； 參考：《武漢科技大學(xué)》2016年碩士論文

【摘要】：礦井傾斜巷道出入口存在高度差,若發(fā)生火災(zāi),井內(nèi)溫度升高,氣體密度減小,產(chǎn)生浮力效應(yīng)使得高溫?zé)煔饪偸茄叵锏雷韵孪蛏狭鲃�。浮力效�?yīng)可造成巷道內(nèi)煙流流動狀態(tài)改變,巷道傾角對煙氣蔓延的影響不容忽視。本文旨在研究火災(zāi)狀況下傾斜巷道煙氣運動規(guī)律、煙氣溫度分布規(guī)律,提出利用通風(fēng)對煙氣蔓延進行控制的措施,為幫助礦井內(nèi)工作人員安全逃生和減少相關(guān)物資損失提出建議。首先,本文結(jié)合著火巷道內(nèi)煙氣擴散情況,提出一種更為精確的浮力效應(yīng)煙流阻力區(qū)域模型。根據(jù)能量守恒原理,建立火源區(qū)、火源下游區(qū)煙流沿程溫度分布模型及浮力效應(yīng)煙流阻力模型。運用MATLAB軟件對某傾斜巷道求解分析,得到火災(zāi)情況下煙氣浮力效應(yīng)煙流阻力是火源強度、巷道傾角綜合作用的結(jié)果,為確定火災(zāi)煙氣運動規(guī)律及臨界風(fēng)速控制的影響因素提供依據(jù)。其次,借助FDS數(shù)值模擬方法,構(gòu)建傾斜巷道物理模型,探究傾斜角度在0o~30o的巷道發(fā)生火災(zāi)時,煙氣溫度分布規(guī)律以及煙氣蔓延長度變化規(guī)律。結(jié)果表明,進行正角度送風(fēng),煙氣最高溫度普遍低于同風(fēng)速下水平巷道;進行負(fù)角度送風(fēng),煙氣最高溫度普遍高于風(fēng)速下水平巷道,因此,不同通風(fēng)模式下,為控制傾斜巷道火災(zāi)蔓延所需要的臨界風(fēng)速須分別討論。最后,軟件模擬研究不同的傾斜巷道、不同通風(fēng)模式下的臨界風(fēng)速變化規(guī)律。模擬結(jié)果指出,傾斜巷道進行正角度送風(fēng),傾角的存在使得臨界風(fēng)速減小,擬合得到臨界風(fēng)速傾角修正系數(shù)為kg=0.98818-0.00765θ(θ為巷道傾角值);進行負(fù)角度送風(fēng),傾角的存在使得臨界風(fēng)速增大,擬合得到臨界風(fēng)速傾角修正系數(shù)為k_g=1.01521+0.00776θ(θ為巷道傾角值),為礦井傾斜巷道臨界風(fēng)速危害控制的確定提供理論基礎(chǔ)。
[Abstract]:There is a difference in height at the entry and exit of inclined roadway. If a fire occurs, the temperature in the well increases and the gas density decreases. The buoyancy effect results in the high temperature flue gas flowing along the roadway from the bottom up. Buoyancy effect can change the flow state of flue gas in roadway, and the influence of tunnel inclination on flue gas spread can not be ignored. The purpose of this paper is to study the movement of flue gas and the distribution of flue gas temperature in inclined roadway under the condition of fire, and to put forward some measures to control the spread of flue gas by using ventilation. In order to help the safety of mine staff escape and reduce the loss of related materials. Firstly, a more accurate regional model of buoyancy effect smoke flow resistance is proposed according to the smoke diffusion in the fire tunnel. According to the principle of conservation of energy, the temperature distribution model of smoke flow along the path and the resistance model of buoyant smoke flow in the fire source region and the downstream area of the fire source are established. By using MATLAB software to solve the problem of a inclined roadway, the results of smoke resistance caused by smoke buoyancy under fire are obtained, which are caused by the intensity of fire source and the comprehensive action of roadway inclination angle. It provides the basis for determining the movement law of fire smoke and the influencing factors of critical wind speed control. Secondly, the physical model of inclined roadway is constructed with the help of the numerical simulation method of FDS, and the temperature distribution and the length of flue gas spread are studied when the inclined angle occurs in the roadway of 0o~30o. The results show that the maximum temperature of flue gas is generally lower than that of horizontal roadway under the same wind speed, and the maximum temperature of flue gas is generally higher than that of horizontal roadway under the same wind speed, so, under different ventilation modes, the maximum temperature of flue gas is generally higher than that of horizontal roadway under wind speed. The critical wind speed needed to control the fire spread of inclined roadway should be discussed separately. Finally, the software simulates the variation of critical wind speed in different inclined roadways and different ventilation modes. The simulation results show that the inclined roadway carries on the positive angle air supply, the existence of the inclination angle makes the critical wind speed decrease, the fitting results show that the correction coefficient of the critical wind speed inclination angle is kg=0.98818-0.00765 胃 (胃 is the roadway inclination angle value), and the negative angle air supply is carried out. The existence of inclination angle increases the critical wind speed. The fitting results show that the correction coefficient of critical wind velocity inclination angle is k_g=1.01521 0.00776 胃 (胃 is the angle value of roadway), which provides a theoretical basis for the determination of critical wind speed hazard control of mine inclined roadway.
【學(xué)位授予單位】：武漢科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2016
【分類號】：TD752

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本文編號：2035543