礦井火區(qū)封閉進(jìn)程中瓦斯爆炸極限模擬研究
本文選題:礦井火區(qū)封閉 切入點(diǎn):瓦斯爆炸 出處:《中國礦業(yè)大學(xué)》2017年碩士論文 論文類型:學(xué)位論文
【摘要】:瓦斯爆炸熱動(dòng)力災(zāi)害是威脅礦井安全生產(chǎn),礦井火區(qū)封閉進(jìn)程是瓦斯爆炸爆燃事故易發(fā)時(shí)間節(jié)點(diǎn)。礦井火區(qū)封閉進(jìn)程改變了礦井中氣體濃度場、溫度場,改變了瓦斯爆炸危險(xiǎn)性。因此,本文以從火源燃燒狀態(tài)、多組分煙氣耦合作用下甲烷混合氣體爆炸、火區(qū)封閉過程瓦斯爆炸危險(xiǎn)性時(shí)空分布等方面對礦井火區(qū)封閉過程瓦斯爆炸熱動(dòng)力災(zāi)害發(fā)生規(guī)律進(jìn)行研究。通過對礦井火區(qū)封閉進(jìn)程進(jìn)行研究,揭示了封閉火區(qū)火源燃燒狀態(tài)變化規(guī)律。研究結(jié)果表明采用進(jìn)回風(fēng)巷同時(shí)封閉方法對礦井火區(qū)進(jìn)行封閉時(shí),封閉區(qū)域局部阻力隨封閉時(shí)間增加呈指數(shù)增加,且在封閉過程中機(jī)械通風(fēng)風(fēng)量線性降低,當(dāng)機(jī)械通風(fēng)風(fēng)量降低至初始風(fēng)量65%~70%時(shí),封閉火區(qū)火源位置氧氣濃度降低至16%以下,火源燃燒狀態(tài)由富氧燃燒轉(zhuǎn)變?yōu)楦蝗剂先紵?火災(zāi)煙氣由單一氣體為主轉(zhuǎn)變?yōu)槎嘟M分氣體共存。利用甲烷燃燒爆炸過程中熱平衡原理,提出了開放系統(tǒng)、半封閉系統(tǒng)以及封閉系統(tǒng)的熱平衡模型,采用熱平衡法建立多組分氣體耦合作用下甲烷混合氣體爆炸界限的演化模型。揭示了單一火災(zāi)氣體對甲烷爆炸極限影響規(guī)律:CO_2提升了甲烷混合氣體爆炸下限,降低了混合氣體爆炸上限;CO降低了甲烷混合氣體爆炸下限。在此基礎(chǔ)上,提出了CO_2和CO多組分氣體耦合作用甲烷混合氣體極限動(dòng)態(tài)變化規(guī)律:CO_2和CO煙氣濃度與組分比值改變了甲烷混合氣體爆炸極限,且混合氣體爆炸極限對不同組分氣體敏感性存在差異:甲烷混合氣體爆炸下限對CO更敏感,甲烷混合氣體爆炸上限對CO_2更為敏感。應(yīng)用數(shù)值分析研究了礦井火區(qū)封閉進(jìn)程中瓦斯爆炸危險(xiǎn)性,揭示了火區(qū)封閉過程中采空區(qū)瓦斯爆炸危險(xiǎn)性時(shí)空分布。采用有限元模型,并對FLUENT進(jìn)行二次開發(fā)實(shí)現(xiàn)礦井火區(qū)封閉進(jìn)程的數(shù)值分析。礦井火區(qū)封閉進(jìn)程中瓦斯在CO_2和CO煙氣耦合作用下,爆炸危險(xiǎn)性較高區(qū)域主要位于采空區(qū)靠近火源位置與回風(fēng)側(cè)區(qū)域,其在靠近火源位置出現(xiàn)高度危險(xiǎn)區(qū)域;當(dāng)封閉過程中風(fēng)量降到原配風(fēng)量的小于7.5%~12.5%時(shí),封閉火區(qū)內(nèi)可燃性混合氣體濃度位于爆炸極限范圍內(nèi),爆炸的危險(xiǎn)性最高。
[Abstract]:The thermal power disaster of gas explosion is a threat to mine safety, and the process of mine fire area closure is the time node of gas explosion and deflagration accident. The process of mine fire zone closure changes the gas concentration field and temperature field in the mine. Therefore, in this paper, the methane mixture gas explosion under the action of multi-component flue gas coupling from the state of fire source combustion, In this paper, the occurrence law of gas explosion thermal dynamic disaster in the process of coal mine fire closure is studied from the aspects of the space-time distribution of gas explosion hazard in the process of fire area closure, and the process of mine fire area closure is studied. The research results show that the local resistance of the closed area increases exponentially with the increase of the closing time when the fire source combustion state of the closed fire area is closed at the same time as the inlet and return air lane is closed to the mine fire area. In the process of sealing, the air volume of mechanical ventilation decreases linearly. When the air volume of mechanical ventilation decreases to the initial air volume of 65 ~ 70, the oxygen concentration of the fire source in the closed fire area decreases to less than 16%, and the combustion state of the fire source changes from oxygen-enriched combustion to fuel-rich combustion. Based on the principle of heat balance in methane combustion and explosion, the thermal equilibrium models of open system, semi-closed system and closed system are proposed. The evolution model of the explosion boundary of methane mixture gas under the coupling action of multi-component gas is established by using the thermal equilibrium method. The effect of a single fire gas on the limit of methane explosion is revealed. The upper limit of mixture gas explosion is reduced and the lower limit of methane mixture explosion is reduced by CO. The dynamic variation of the limit of methane mixture gas coupled with CO_2 and CO is presented. The concentration of CO and the ratio of CO concentration to component change the explosion limit of methane mixture gas. The explosion limit of mixed gas is sensitive to different components of gases: the lower limit of methane mixture explosion is more sensitive to CO. The upper limit of methane mixed gas explosion is more sensitive to CO_2. The danger of gas explosion in mine fire area is studied by numerical analysis, and the spatiotemporal distribution of gas explosion risk in goaf is revealed by using finite element model. Numerical analysis of FLUENT secondary development to realize the process of mine fire closure. Under the action of CO_2 and CO flue gas coupling, the area with high explosion risk is mainly located in the goaf near the fire source position and return air side area. The combustible mixed gas concentration in the closed fire zone is within the limit of explosion, and the explosion risk is the highest when the air volume decreases to the original air volume less than 7.5 ~ 12.5 in the closed fire area.
【學(xué)位授予單位】:中國礦業(yè)大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2017
【分類號】:TD712.7
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