本文選題：瓦斯煤塵爆炸 + 煤塵卷揚(yáng)�。� 參考：《中北大學(xué)》2015年碩士論文

【摘要】：我國擁有豐富的石化能源，同時(shí)也是一個(gè)能源生產(chǎn)大國和消費(fèi)大國。煤炭在我國的能源結(jié)構(gòu)中長期占主導(dǎo)地位，并且在未來的一段時(shí)間內(nèi)，依然是國家基礎(chǔ)建設(shè)中非常重要的戰(zhàn)略物資。 本文運(yùn)用理論分析和數(shù)值模擬仿真相結(jié)合的手段對(duì)煤塵爆炸機(jī)理和條件，以及障礙物對(duì)瓦斯爆炸卷揚(yáng)沉積煤粉的影響進(jìn)行了研究。主要研究內(nèi)容是，建立瓦斯爆炸卷揚(yáng)沉積煤粉直管道模型，從理論分析和模擬仿真兩方面討論了煤塵顆粒在沖擊波作用下的運(yùn)動(dòng)過程；在置障條件下，分別對(duì)障礙物阻塞率、障礙物數(shù)量、障礙物間距對(duì)煤塵卷揚(yáng)的過程進(jìn)行了模擬仿真。通過數(shù)值模擬得出以下結(jié)論： (1)煤塵卷揚(yáng)過程一共經(jīng)歷三個(gè)階段：加速上揚(yáng)階段、減速階段和氣力輸送階段。上揚(yáng)階段煤塵云的左端會(huì)呈現(xiàn)彎曲的鉤狀，且?guī)缀跞糠植荚诠艿滥Ｐ偷南掳氩糠郑粶p速階段經(jīng)歷的時(shí)間比較短，煤塵云濃度較高，大部分煤塵沒有參加反應(yīng)；氣力輸送階段的煤塵在水平方向上的速度快速增大，煤塵顆粒開始延管道傳播，煤塵區(qū)被拉長。 (2)不同阻塞率的障礙物對(duì)煤塵顆粒的影響不同，阻塞率為50%和75%時(shí)對(duì)煤塵云分布狀況的影響較為顯著；障礙物阻塞率越大，，煤塵顆粒在水平方向上的輸送距離越短；障礙物阻塞率為50%時(shí)對(duì)壓力的增速影響最大。 (3)障礙物的數(shù)量越多，管道內(nèi)峰值壓力越大，到達(dá)峰值所經(jīng)歷的時(shí)間越短。多障礙物情況下，壓力會(huì)出現(xiàn)來回震蕩的現(xiàn)象。 (4)障礙物間距對(duì)峰值壓力的影響較小，且6m時(shí)壓力的變化規(guī)律與3m時(shí)壓力的變化規(guī)律相比也沒有明顯的變化。
[Abstract]:China is rich in fossil energy, but also a large country of energy production and consumption. Coal has dominated the energy structure of our country for a long time, and in the future, it is still a very important strategic material in the national infrastructure construction. In this paper, the mechanism and condition of coal dust explosion and the influence of obstacles on coal powder deposited by gas explosion are studied by means of theoretical analysis and numerical simulation. The main research contents are as follows: the model of straight pipeline of coal powder deposited by gas explosion is established, and the movement process of coal dust particles under shock wave is discussed from two aspects: theoretical analysis and simulation. The process of coal dust hoisting is simulated by the number of obstacles and the distance between obstacles. The following conclusions are obtained by numerical simulation: 1) the coal dust hoisting process goes through three stages: accelerating rising stage, decelerating stage and pneumatic conveying stage. In the upward stage, the left end of coal dust cloud will be crooked, and almost all of it will be distributed in the lower half of the pipeline model, and the deceleration period will be relatively short, the concentration of coal dust cloud will be higher, and most coal dust will not participate in the reaction. The velocity of coal dust in the horizontal direction increases rapidly in the stage of pneumatic conveying, the coal dust particles begin to spread along the pipeline, and the coal dust area is elongated. (2) the influence of obstructions with different blocking rates on coal dust particles is different, when the blocking rate is 50% and 75%, the distribution of coal dust clouds is more significant, and the bigger the obstruction rate is, the shorter the transport distance of coal dust particles in horizontal direction is. The obstruction ratio of 50 has the greatest effect on the growth of pressure. 3) the more obstacles, the greater the peak pressure and the shorter the time to reach the peak. In the case of multiple obstacles, the pressure will oscillate back and forth. (4) the distance between obstacles has little effect on the peak pressure, and the change of pressure at 6m is not obvious compared with that at 3m.
【學(xué)位授予單位】：中北大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TD712.7;TD714.5

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 李潤之;;瓦斯爆炸誘導(dǎo)沉積煤塵爆炸的數(shù)值模擬[J];爆炸與沖擊;2010年05期

2 李潤之;蔡周全;薛少謙;;瓦斯爆炸引起沉積煤塵卷揚(yáng)爆炸的機(jī)理研究[J];礦業(yè)安全與環(huán)保;2007年06期

3 何朝遠(yuǎn),張引合;煤塵爆炸特性與揮發(fā)分的關(guān)系[J];工業(yè)安全與防塵;1997年11期

4 王克全;煤塵與礦井特大爆炸傷亡事故的關(guān)系[J];工業(yè)安全與防塵;1998年01期

5 牛芳;劉慶明;白春華;何學(xué)秋;宮廣東;;甲烷-煤塵爆炸物火焰?zhèn)鞑ヌ匦訹J];高壓物理學(xué)報(bào);2012年04期

6 司榮軍;;瓦斯煤塵爆炸研究現(xiàn)狀及發(fā)展趨勢[J];礦業(yè)安全與環(huán)保;2014年01期

7 陸守香,范寶春;激波卷揚(yáng)可燃粉塵的理論模型[J];淮南礦業(yè)學(xué)院學(xué)報(bào);1996年01期

8 徐梓銘;劉然;劉志堅(jiān);;煤礦瓦斯爆炸的條件與預(yù)防措施[J];煤炭科技;2007年03期

9 高建康,菅從光,林柏泉,李超;壁面粗糙度對(duì)瓦斯爆炸過程中火焰?zhèn)鞑ズ捅úǖ淖饔肹J];煤礦安全;2005年02期

10 吳紅波;顏事龍;張立;;障礙物對(duì)瓦斯火焰?zhèn)鞑ミ^程的影響[J];煤礦爆破;2006年01期

相關(guān)博士學(xué)位論文 前1條

1 程磊;受限空間煤塵爆炸沖擊波傳播衰減規(guī)律研究[D];河南理工大學(xué);2011年

本文編號(hào)：1803321