本文選題：礦井巷道火災(zāi) + 煙氣流動　； 參考：《江西理工大學(xué)》2015年碩士論文

【摘要】：火災(zāi)因其危害性大成為礦山主要災(zāi)害之一�；馂�(zāi)產(chǎn)生的高溫有毒有害煙氣在井下狹長受限空間內(nèi)流動,不僅損壞井下設(shè)備和影響正常生產(chǎn),而且污染井下作業(yè)環(huán)境,威脅作業(yè)人員生命健康。因此,對礦井火災(zāi)煙氣流動的研究具有重要意義。本文主要研究內(nèi)容是對礦井巷道火災(zāi)煙氣流動進(jìn)行數(shù)值模擬分析,并在此基礎(chǔ)上對井下巷道進(jìn)行安全區(qū)域劃分。首先,建立礦井巷道火災(zāi)風(fēng)流流動連續(xù)性方程、動量方程、能量方程、組分方程。其次,對外因火災(zāi)和內(nèi)因火災(zāi)形成原因進(jìn)行了具體系統(tǒng)地分析。再次,通過GAMBIT軟件建立相似物理模型后導(dǎo)入FLUENT軟件進(jìn)行井下巷道火災(zāi)煙氣流動數(shù)值模擬,分別對巷內(nèi)發(fā)生火災(zāi)后機(jī)械通風(fēng)和巷道風(fēng)流穩(wěn)定時發(fā)生火災(zāi),這兩種情況進(jìn)行數(shù)值模擬。并選取了巷內(nèi)風(fēng)速、火災(zāi)規(guī)模兩個影響因素分組進(jìn)行模擬。最后,對火災(zāi)災(zāi)變時期巷道內(nèi)安全區(qū)域進(jìn)行劃分,并列舉了根據(jù)溫度和CO濃度對巷道安全等級區(qū)域劃分的實(shí)例。研究結(jié)果表明:巷道內(nèi)發(fā)生火災(zāi)后機(jī)械通風(fēng)和巷道風(fēng)流穩(wěn)定時發(fā)生火災(zāi)兩種情況,經(jīng)過較長時間后,當(dāng)火災(zāi)產(chǎn)生煙氣與排出煙氣量達(dá)到一定平衡后,巷道內(nèi)煙氣流動均趨于穩(wěn)定流態(tài);當(dāng)巷道內(nèi)風(fēng)速較小或火災(zāi)規(guī)模較大時,火災(zāi)產(chǎn)生的高溫有毒有害煙沖向頂板形成“蘑菇狀”,部分煙氣會沿巷道頂板向火源上游流動,對火源上游巷道有一定污染,并且對火源下游巷道污染嚴(yán)重;隨著巷道內(nèi)風(fēng)流的增大,排出煙氣的速率有所增大,逐步消除煙氣對火源上游巷道的污染,煙氣濃度有所降低,巷道氣流的溫度也隨之降低,排煙的效果更好;隨著火災(zāi)規(guī)模的增大,巷道內(nèi)煙氣濃度和溫度增大,對火源下游巷道的污染加強(qiáng),同等風(fēng)速排出煙流的能力明顯降低,排煙效果隨之減弱。本文通過對礦井巷道火災(zāi)煙氣流動進(jìn)行數(shù)值模擬,揭示了巷道內(nèi)火災(zāi)煙氣流動和溫度、有毒煙氣分布規(guī)律,供礦山巷道火災(zāi)防治作參考。此外,根據(jù)模擬結(jié)果和不同溫度值、有毒氣體濃度對人體影響,對礦井巷道安全區(qū)域等級進(jìn)行劃分,對井巷火災(zāi)搶險(xiǎn)救災(zāi)和人員緊急逃生具有一定的參考價(jià)值。
[Abstract]:Fire has become one of the main disasters in mines because of its great harmfulness. The high temperature, toxic and harmful smoke produced by fire flows in the narrow and narrow confined space, which not only damages the underground equipment and affects normal production, but also pollutes the working environment and threatens the life and health of the workers. Therefore, the study of mine fire smoke flow is of great significance. The main research content of this paper is to simulate and analyze the smoke flow of mine roadway fire, and on this basis, to divide the safe area of underground roadway. Firstly, the continuity equation, momentum equation, energy equation and component equation are established. Secondly, the causes of external fire and internal fire are analyzed systematically. Thirdly, building similar physical model by GAMBIT software and introducing FLUENT software to numerical simulation of smoke flow in underground roadway fire, respectively, when mechanical ventilation occurred in roadway fire and roadway wind flow stabilized, fire occurred respectively. These two cases are numerically simulated. Two factors, wind speed and fire scale, are selected for simulation. Finally, the safe area in the roadway during the period of fire disaster is divided, and an example of dividing the safety zone of the roadway according to the temperature and CO concentration is given. The results show that there are two kinds of fire conditions: mechanical ventilation after fire in roadway and steady air flow in roadway. After a long time, when the smoke produced by the fire reaches a certain balance with the amount of flue gas discharged, The flue gas flow in roadway tends to steady, when the wind speed is small or the fire scale is large, the high temperature, toxic and harmful smoke produced by the fire will rush to the roof and form a "mushroom" shape, and some of the smoke will flow along the roof of the roadway to the upstream of the fire source. With the increase of the air flow in the roadway, the rate of flue gas emission increases, gradually eliminating the smoke pollution of the upstream roadway of the fire source, and the smoke concentration decreases, while the upstream roadway of the fire source is polluted, and the downstream roadway of the fire source is polluted seriously. With the increase of fire scale, the concentration and temperature of flue gas in the roadway increased, the pollution of the roadway downstream of the fire source was strengthened, and the ability of the same wind speed to discharge smoke flow was obviously reduced. The effect of exhaust smoke was weakened. Through numerical simulation of fire smoke flow in mine roadway, this paper reveals the distribution law of fire smoke flow, temperature and toxic smoke in roadway, which can be used as a reference for mine roadway fire prevention and control. In addition, according to the results of simulation and different temperature values, the influence of toxic gas concentration on human body, the classification of mine roadway safety area grade has certain reference value for mine roadway fire rescue and rescue and personnel emergency escape.
【學(xué)位授予單位】：江西理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TD752

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相關(guān)期刊論文 前1條

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本文編號：1850457