本文選題：瓦斯爆炸 + 20L球形��； 參考：《中北大學》2013年碩士論文

【摘要】：煤礦瓦斯爆炸事故頻發(fā)一直困擾我國安監(jiān)系統(tǒng)和各級政府，雖然近幾年全國煤炭行業(yè)礦井瓦斯爆炸事故有所下降，但在局部地區(qū)、局部礦區(qū)，情況仍然不容樂觀。比如在礦井集中區(qū)、西部欠發(fā)達貧困地區(qū)，，這一問題依然嚴重。為應對煤礦瓦斯爆炸，國家投入了大量的財力、物力，建立了完備的安全生產(chǎn)法律法規(guī)體系，組織安全工程師隊伍，并不斷加大安全技術(shù)研究投入，從法律、管理、技術(shù)多方面采取措施予以解決。 論文利用實驗室自行研制的20L球形爆炸裝置，從甲烷濃度、煤塵濃度、煤塵粒徑三個因素對煤塵爆炸特性的影響入手，研究了純煤塵爆炸特性、甲烷對煤塵爆炸壓力及下限的影響，得到以下結(jié)果。 （1）對200g/m~3~800g/m~3純煤塵爆炸進行實驗研究，結(jié)果表明，隨著煤塵濃度增加，爆炸壓力先升高后降低，煤塵粒徑45μｍ以下、45～48μｍ、54～61μｍ、61～75μｍ，都在600g/m~3時有最大的爆炸壓力值。并且隨著粒徑的增大，煤塵最大爆炸壓力依次減小。 （2）對100g/m~3及以下濃度的純煤塵爆炸實驗表明，隨著濃度的增加，煤塵的爆炸壓力值是遞增的。而隨著粒徑的增大，煤塵的爆炸壓力值卻是遞減的。 （3）對100g/m~3及以下濃度的煤塵甲烷爆炸實驗表明，加入甲烷后，一方面提高了煤粉爆炸威力，另一方面降低了爆炸下限。純煤塵情況下，45μｍ以下的煤塵粒徑，爆炸下限為60g/m~3，而加入甲烷后，1%、3%、5%甲烷對應的下限值卻變化為45g/m~3、37g/m~3、30g/m~3。 （4）對甲烷濃度3%、不同煤塵粒徑的氣粉混合爆炸實驗結(jié)果顯示，在近下限濃度范圍，粒徑對爆炸壓力和爆炸下限有兩方面的影響：一是甲烷煤塵混合爆炸要比純煤塵爆炸威力大，最大爆炸壓力由無甲烷時的0.2007MPa上升到含甲烷時的0.2501MPa；二是隨著粒徑降低，爆炸強度不斷增大，爆炸下限不斷上升。 （5）甲烷濃度1%~5%、煤塵濃度100g/m~3以下、四種煤塵粒徑這三類因素都變化的情況下，在任何兩個因素一定的情況下，其中之一都對爆炸壓力和爆炸下限存在規(guī)律性的影響，這類規(guī)律同高濃度煤塵，或者低揮發(fā)分煤粉條件下的結(jié)論一致，并測得不同甲烷濃度和不同煤塵粒徑對應的爆炸下限。
[Abstract]:The frequent occurrence of coal mine gas explosion accidents has been perplexing the safety supervision system and governments at all levels of our country. Although the mine gas explosion accidents in the national coal industry have declined in recent years, the situation is still not optimistic in local areas and local mining areas. For example, in mine concentration areas, the western underdeveloped poor areas, this problem remains serious. In order to deal with coal mine gas explosion, the state has invested a lot of financial and material resources, established a complete system of safety production laws and regulations, organized a team of safety engineers, and continuously increased the investment in safety technology research, from the law, management, Various technical measures are taken to solve the problem. In this paper, a 20L spherical explosive device developed by the laboratory is used to study the explosion characteristics of pure coal dust, starting with the effects of methane concentration and particle size of coal dust on the explosion characteristics of coal dust. The effects of methane on the explosion pressure and lower limit of coal dust are obtained. (1) the experimental study on 200g/m~3~800g/m~3 pure coal dust explosion shows that the explosion pressure increases first and then decreases with the increase of coal dust concentration. The particle size of coal dust is less than 45 渭 m (45 渭 m) and 48 渭 m ~ (54) ~ (61) 渭 m ~ (61) ~ (65) 渭 m, all of which have the maximum explosion pressure at 600g/m~3. And with the increase of particle size, the maximum explosion pressure of coal dust decreases in turn. (2) the experimental results of pure coal dust explosion with the concentration of 100g/m~3 and below show that the explosion pressure of coal dust increases with the increase of concentration. However, the explosion pressure of coal dust decreases with the increase of particle size. (3) the explosion test of coal dust methane with 100g/m~3 and below concentration shows that, on the one hand, the explosion power of pulverized coal powder is increased after adding methane. On the other hand, the lower limit of explosion is lowered. In the case of pure coal dust, the lower explosion limit of coal dust below 45 渭 m is 60 g / m ~ (3), but after adding methane, the corresponding lower limit of 5% methane varies to 45 g / m ~ 337 g / m ~ (3) ~ (3) g / m ~ (3). (4) the experimental results of gas-powder mixed explosion with different particle size and concentration of methane show that In the near lower limit concentration range, the particle size has two effects on the explosion pressure and explosion lower limit. One is that the mixed explosion of methane coal dust is more powerful than that of pure coal dust explosion, the maximum explosion pressure increases from 0.2007MPa without methane to 0.2501MPa when methane is contained. Second, with the decrease of particle size, the explosion intensity increases, and the lower limit of explosion increases. (5) methane concentration 1 and 5, coal dust concentration below 100g/m~3, and the four kinds of coal dust particle size all change. Under any given condition of two factors, one of them has a regular effect on the explosion pressure and the lower limit of explosion, which is consistent with the conclusion under the condition of high concentration coal dust or low volatile pulverized coal. The explosion lower limit corresponding to different methane concentration and different coal dust particle size was obtained.
【學位授予單位】：中北大學
【學位級別】：碩士
【學位授予年份】：2013
【分類號】：TD714.5

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