瓦斯?jié)舛葘Ρ▊鞑ゼ巴咚贡ㄕT導(dǎo)煤塵爆炸的影響研究
發(fā)布時間：2018-05-21 03:25
本文選題：瓦斯?jié)舛?/strong> + 爆炸傳播��； 參考：《東北大學(xué)》2013年博士論文
【摘要】：運用理論分析、實驗研究和數(shù)值仿真的方法對在不同濃度條件下的瓦斯爆炸壓力、火焰?zhèn)鞑ヒ?guī)律以及瓦斯爆炸誘導(dǎo)沉積煤塵爆炸規(guī)律進(jìn)行了系統(tǒng)深入的研究。在對瓦斯煤塵爆炸的傳播過程進(jìn)行理論分析的基礎(chǔ)上,運用中煤科工集團(tuán)重慶研究院直徑700mm的實驗管道及斷面7.2m2的大型實驗巷道分別實驗研究了不同濃度條件瓦斯爆炸傳播規(guī)律的變化及瓦斯爆炸誘導(dǎo)沉積煤塵參與爆炸的過程,在此基礎(chǔ)上借助流體模擬軟件對其進(jìn)行了模擬驗證分析。通過瓦斯爆炸傳播過程的研究得出,瓦斯爆炸過程中點火處的最大壓力值并不是整個爆炸過程的最大值,沖擊波最大壓力在點火處附近先降低,然后上升到某一峰值后再逐步衰減。瓦斯?jié)舛鹊母淖儗Ρㄟ^程中壓力和火焰的傳播規(guī)律有明顯影響,當(dāng)測定點距離一定時,壓力峰值與濃度呈現(xiàn)二次函數(shù)關(guān)系,火焰?zhèn)鞑ニ俣鹊牡箶?shù)與濃度呈現(xiàn)二次函數(shù)關(guān)系；點火附近火焰?zhèn)鞑ニ俣容^小,上升到某一峰值后又衰減。通過研究認(rèn)為,激波及波后氣體的湍流效應(yīng)是引起沉積煤塵揚(yáng)起的主要因素。煤塵顆粒的表面剪切力在其上揚(yáng)過程中維持在某一閾值,所以沉積的煤塵顆�？梢跃S持在一定的速度范圍內(nèi)向上揚(yáng)起。通過對煤塵顆粒速度場數(shù)值模擬的分析,發(fā)現(xiàn)沉積煤塵的揚(yáng)起過程主要由啟動、加速和減速三個階段組成。有煤塵參與的混合爆炸相對于單純瓦斯爆炸,其爆炸產(chǎn)生的沖擊波及火焰鋒面不易衰減,傳播速度更快,持續(xù)時間更長,壓力峰值更高,波及范圍更廣；在瓦斯爆炸誘導(dǎo)沉積煤塵爆炸的起始階段,爆炸產(chǎn)生的正壓區(qū)持續(xù)時間更長,并且爆炸壓力在較長時間內(nèi)產(chǎn)生持續(xù)的回升現(xiàn)象,破壞性更大；最大爆炸壓力的出現(xiàn)時間并非沿著管道傳播距離的加長而依次后延,也并非隨最大爆炸壓力的大小依次出現(xiàn)。瓦斯爆炸游到沉積煤塵爆炸的過程分為單純瓦斯起爆階段、沉積煤塵卷揚(yáng)參與爆炸階段(即瓦斯爆炸產(chǎn)生的沖擊波與沉積煤塵作用、沉積煤塵卷揚(yáng)起并被與瓦斯爆炸的火焰波引爆階段)、瓦斯煤塵混合爆炸傳播階段和爆炸衰減等四個階段。根據(jù)研究得出,在起爆階段壓力峰值出現(xiàn)時間最早,煤塵卷揚(yáng)參與爆炸階段壓力峰值出現(xiàn)時間遠(yuǎn)遠(yuǎn)晚于瓦斯煤塵混合爆炸傳播階段,這是由于沉積煤塵卷揚(yáng)參與爆炸的特點決定的,瓦斯煤塵爆炸傳播衰減階段壓力值的出現(xiàn)的時間最晚。研究得到的這些結(jié)論,對有效防治煤礦爆炸災(zāi)害防治、降低爆炸災(zāi)害所造成的損失以及煤礦瓦斯煤塵爆炸事故的分析調(diào)查具有重要意義。
[Abstract]:By means of theoretical analysis, experimental study and numerical simulation, the pressure of gas explosion, the law of flame propagation and the law of depositional coal dust explosion induced by gas explosion are studied systematically and deeply. Based on the theoretical analysis of the propagation process of gas and coal dust explosion, Using the experimental pipe of diameter 700mm of Chongqing Research Institute of China Coal Science and Technology Group and the large-scale experimental roadway of cross section 7.2m2, the variation of the propagation law of gas explosion and the process of taking part in the explosion of deposited coal dust induced by gas explosion were studied respectively. On this basis, the fluid simulation software is used to verify and analyze it. Through the study of the gas explosion propagation process, it is concluded that the maximum pressure of the ignition fire is not the maximum value of the whole explosion process, and the maximum pressure of the shock wave decreases first near the igniting fire. Then rise to a certain peak and then gradually attenuate. The change of gas concentration has obvious influence on the pressure and flame propagation law in the process of explosion. When the measuring point distance is fixed, the relationship between the pressure peak value and the concentration is quadratic, and the reciprocal of flame propagation velocity is quadratic function relationship with the flame concentration. The flame propagates slowly near the ignition, and then attenuates after rising to a certain peak. It is considered that the turbulent effect of the gas behind the shock wave is the main factor to cause the rising of sedimentary coal dust. The surface shear force of coal dust particles is maintained at a certain threshold value during the rising process, so the deposited coal dust particles can be raised upward in a certain velocity range. Through the numerical simulation of velocity field of coal dust particles, it is found that the raising process of deposited coal dust consists of three stages: starting, accelerating and decelerating. Compared with the pure gas explosion, the mixed explosion with coal dust is not easy to attenuate, propagate faster, last longer, the pressure peak value is higher, and the range is wider. In the initial stage of coal dust explosion induced by gas explosion, the barotropic zone produced by the explosion lasts longer, and the explosion pressure produces a sustained recovery phenomenon in a longer period of time, which is more destructive. The occurrence time of the maximum explosion pressure is not followed by the increase of the propagation distance of the pipeline, nor is it followed by the magnitude of the maximum explosion pressure. The process from gas explosion to sedimentary coal dust explosion can be divided into simple gas initiation stage, and sedimentary coal dust hoisting takes part in the explosion stage (that is, the shock wave produced by gas explosion and the effect of deposited coal dust). The depositional coal dust is hoisted and is detonated by the flame wave with the gas explosion, the gas coal dust mixed explosion propagation stage and the explosion attenuation stage. According to the study, the peak pressure appeared the earliest time in the initiation stage, and the coal dust hoisting involved in the explosion phase, the time of the peak pressure appeared much later than the gas coal dust mixed explosion stage. It is decided by the characteristics that the deposited coal dust is involved in the explosion, and the pressure value of the gas coal dust explosion propagation attenuation stage is the latest. These conclusions are of great significance to the prevention and control of coal mine explosion disaster, the reduction of the loss caused by explosion disaster and the analysis and investigation of coal mine gas and coal dust explosion accident.
【學(xué)位授予單位】：東北大學(xué)
【學(xué)位級別】：博士
【學(xué)位授予年份】：2013
【分類號】：TD712.7
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