本文關(guān)鍵詞：管道內(nèi)預(yù)混可燃?xì)怏w爆炸及其泄爆的數(shù)值模擬　出處：《中北大學(xué)》2017年碩士論文　論文類(lèi)型：學(xué)位論文

  更多相關(guān)文章： 氣體爆炸 數(shù)值模擬 爆炸超壓 障礙物 泄爆 管道

【摘要】：可燃?xì)怏w爆炸是工業(yè)生產(chǎn)和生活中爆炸災(zāi)害的主要形式之一。為了更好地預(yù)防和控制易燃?xì)怏w爆炸事故,本文利用氣體爆炸模擬軟件AutoReaGas對(duì)管道內(nèi)預(yù)混可燃?xì)怏w爆炸及其泄爆特性進(jìn)行數(shù)值模擬研究,揭示甲烷摻混氫氣比例、初始條件、障礙物以及泄爆條件等因素對(duì)爆炸特性的影響規(guī)律,主要研究工作和成果如下:研究了管道內(nèi)甲烷摻混氫氣比例對(duì)爆炸峰值超壓和溫度的影響規(guī)律。峰值超壓隨著摻氫比的增加而增加。當(dāng)摻氫比為75%時(shí),最大峰值超壓為27.03bar,達(dá)到摻氫比25%時(shí)產(chǎn)生的最大峰值超壓5.571bar的4.85倍。隨著摻氫比的增加,爆炸峰值溫度具有明顯增大的趨勢(shì)。當(dāng)摻氫比從25%增加到75%時(shí),得到的爆炸峰值溫度從3170K增加到4791K,提高了1621K。研究管道內(nèi)初始?jí)毫统跏紲囟葘?duì)預(yù)混燃?xì)?空氣混和物爆炸壓力的影響規(guī)律。爆炸峰值超壓隨初始?jí)毫Φ脑黾映示�性增加。此外,初始?jí)毫?duì)爆炸峰值超壓的影響越來(lái)越大始溫度的升高逐漸減弱。初始溫度25oC和50oC時(shí),初始?jí)毫γ可?bar,得超壓峰值增加到59kpa和53kpa,分別。爆炸峰值超壓隨著初始溫度的升高而逐漸減小,初始溫度對(duì)爆炸峰值超壓的影響與初始?jí)毫Φ拇笮∶芮邢嚓P(guān)。初始溫度對(duì)爆炸峰值超壓的影響隨著初始?jí)毫Φ脑黾佣龃�。研究了�?nèi)置障礙物管道內(nèi)障礙物數(shù)量,阻塞比等因素對(duì)預(yù)混甲烷/空氣混合氣體爆炸壓力的影響規(guī)律。爆炸峰值超壓隨著障礙物數(shù)的增加而增加。當(dāng)障礙物的數(shù)量增加到13時(shí),在管內(nèi)最大峰值超壓達(dá)到882.0kpa,為無(wú)障礙物時(shí)管內(nèi)最大峰值超壓19.1kPa的46.2倍。峰值超壓隨著阻塞比的增大而增大,但隨著阻塞率的增加,其峰值不單調(diào)增加,但當(dāng)阻塞比達(dá)到一定程度時(shí),峰值超壓將逐漸減小。當(dāng)阻塞比為75%峰值超壓達(dá)到最大值489.5kPa,為無(wú)障礙物時(shí)最大峰值超壓的25.6倍。研究了泄爆膜位置和泄爆壓力等條件對(duì)管道中甲烷/空氣混合氣體爆炸超壓以及溫度等參數(shù)的影響規(guī)律。泄爆膜位置對(duì)爆炸峰值超壓和溫度均有顯著影響。當(dāng)泄爆膜位置在Ⅱ(管道中間)時(shí),管內(nèi)最大峰值超壓和溫度達(dá)到最小,泄爆效果最好。泄爆壓力對(duì)壓力波傳播有較大影響。泄爆壓力越大,壓力波沿管道傳播過(guò)程中超壓的衰減速率越慢,曲線也越平緩。泄爆壓力的變化對(duì)管道峰值溫度的影響程度不大。
[Abstract]:Flammable gas explosion is one of the main forms of explosion disaster in industrial production and daily life. In order to prevent and control flammable gas explosion accidents better. In this paper, gas explosion simulation software AutoReaGas is used to simulate the explosion characteristics of premixed combustible gas in pipeline, and the initial conditions of methane mixing hydrogen are revealed. The influence of obstacles and explosion discharge conditions on the explosion characteristics. The main work and results are as follows: the effect of hydrogen ratio of methane mixing in pipeline on the explosion peak overpressure and temperature is studied. The peak overpressure increases with the increase of hydrogen doping ratio, and when the hydrogen ratio is 75. The maximum peak overpressure is 27.03 bar. which is 4.85 times of the maximum peak overpressure of 5.571bar when the hydrogen ratio is 25. The peak temperature of explosion increases from 3170K to 4791K when the ratio of hydrogen to hydrogen increases from 25% to 75. The effect of initial pressure and temperature on the explosion pressure of premixed gas / air mixture is studied. The peak explosion overpressure increases linearly with the increase of initial pressure. The effect of the initial pressure on the explosion peak overpressure decreases gradually, and the initial pressure increases by 1 bar at the initial temperature of 25oC and 50oC. The overpressure peak increases to 59kpa and 53kpa, respectively. The explosion peak overpressure decreases with the increase of the initial temperature. The effect of the initial temperature on the explosion peak overpressure is closely related to the initial pressure, and the effect of the initial temperature on the explosion peak overpressure increases with the increase of the initial pressure. . The effect of blocking ratio on the explosion pressure of premixed methane / air mixture gas. The explosion peak overpressure increases with the increase of the number of obstacles, when the number of obstacles increases to 13:00. The maximum peak overpressure in the tube reaches 882.0 KPA, which is 46.2 times of the maximum peak overpressure of 19.1kPa without obstruction. The peak overpressure increases with the increase of blocking ratio. However, with the increase of blocking rate, the peak value does not increase monotonously, but when the blocking ratio reaches a certain degree, the peak overpressure will gradually decrease, and when the blocking ratio is 75%, the peak overpressure reaches the maximum 489.5 KPA. It is 25.6 times of the maximum peak overpressure without obstacles. The influence of the location of venting film and the pressure of venting on the explosion overpressure and temperature of methane / air mixture gas in pipeline are studied. The explosion peak overpressure and temperature are significantly affected. In the middle of the pipe. The maximum peak overpressure and temperature in the pipe reach the minimum, and the effect of explosion is the best. The larger the pressure is, the slower the attenuation rate of pressure wave is in the process of propagating the pressure wave along the pipeline. The curve is more gentle, and the change of explosion pressure has little effect on the peak temperature of pipeline.
【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】：2017
【分類(lèi)號(hào)】：O643.221

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