封闭空间内瓦斯浓度对瓦斯爆炸反应动力学特性的影响

李祥春; 聂百胜; 杨春丽; 陈金伟

doi:10.11858/gywlxb.2017.02.005

封闭空间内瓦斯浓度对瓦斯爆炸反应动力学特性的影响

doi: 10.11858/gywlxb.2017.02.005

李祥春^{1, 2,},
聂百胜^{1, 2,*, ,},
杨春丽³,
陈金伟^{1, 2}

1.
中国矿业大学(北京)资源与安全工程学院, 北京 100083
2.
中国矿业大学(北京)煤炭资源与安全开采国家重点实验室, 北京 100083
3.
中国矿业大学(北京)力学与建筑工程学院, 北京 100083

基金项目:

国家自然科学基金 51304212

教育部高等学校博士学科点专项科研基金 20120023120005

北京高等学校青年英才计划项目 YETP0930

中央高校基本科研业务费专项资金 2009QZ09

详细信息

作者简介:
李祥春(1979—), 男，博士，副教授，主要从事安全科学及工程研究.E-mail:chinalixc123@163.com

通讯作者:
聂百胜(1973—), 男，博士，教授，主要从事安全科学及工程研究.E-mail:bshnie@163.com

中图分类号: O381; X932
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出版历程
- 收稿日期: 2015-09-23
- 修回日期: 2016-06-06

Effect of Gas Concentration on Kinetic Characteristics of Gas Explosion in Confined Space

LI Xiang-Chun^{1, 2
,},
NIE Bai-Sheng^{1, 2,*
, ,},
YANG Chun-Li³,
CHEN Jin-Wei^{1, 2}

1.
School of Resource and Safety Engineering, China University of Mining & Technology (Beijing), Beijing 100083, China
2.
State Key Lab of Coal Resources and Safe Mining, Beijing 100083, China
3.
School of Mechanics and Civil Engineering, China University of Mining & Technology (Beijing), Beijing 100083, China)

摘要

摘要: 为了研究瓦斯浓度对瓦斯爆炸反应动力学特性的影响，利用定容反应器模型，对不同瓦斯浓度情况下的瓦斯爆炸反应进行了模拟研究。研究结果表明：随着初始瓦斯浓度的增加，瓦斯爆炸的最终温度先升后降，压力逐渐升高；·OH、H·和O·自由基摩尔分数先升后降；残余的CH₄摩尔分数缓慢增加，O₂摩尔分数缓慢减少至零。瓦斯爆炸的最佳反应浓度比化学计量浓度要高，大约在10%~12%之间，此时爆炸后体系中温度达到最大值。在化学当量比情况下，对甲烷和氧气的消耗、自由基(O·和H·)的生成起促进作用的关键基元反应步为R32、R38、R85、R118、R119、R155、R156、R157；对甲烷和氧气的产生、自由基(O·和H·)的消减起促进作用的关键基元反应步为R53、R158。
- 瓦斯爆炸 /
- 瓦斯浓度 /
- 模拟 /
- 基元反应步
Abstract: To study the effect of gas concentration on kinetic characteristics of gas explosion in a closed space, we simulated the gas explosion with different gas concentrations using a constant volume reactor model.The results show that with the increase of the initial gas concentration, the final temperature increases at first till its maximum and then decreases, and the pressure increases continuously; the concentrations of ·OH, H· and O· increase at first to the maximum and then decrease; the remnants of CH₄ increase slowly and those of O₂ are gradually reduced to zero.For gas explosion, the optimum reaction concentration (about 10%-12%) is higher than the stoichiometric mole fraction and the temperature reaches the maximum at this time.In the case of the stoichiometric mole fraction, the primitive reactions which contribute to the consumption of methane and oxygen and the generation of free radical (O· and H·) is R32, R38, R85, R118, R119, R155, R156, R157;the primitive reactions which contribute to the generation of methane and oxygen and the reduction of free radical (O· and H·) are R53 and R158.
- gas explosion /
- gas concentration /
- simulation /
- the key elementary reaction step (TKER)

HTML全文

图 1 CH₄和O₂摩尔分数随时间的变化(初始CH₄浓度为6.0%、9.5%和14.0%)

Figure 1. Mole fractions of CH₄ and O₂ vary with time at initial CH₄ concentration of 6.0%, 9.5% and 14.0%

下载: 全尺寸图片幻灯片

图 2 CH₄浓度对最终反应物摩尔分数变化的影响

Figure 2. Effect of CH₄ concentration on the variation of final reactants' mole fraction

下载: 全尺寸图片幻灯片

图 3 压力和温度随时间的变化(初始CH₄浓度为6.0%、9.5%和14.0%)

Figure 3. Temperature and pressure vary with time at initial CH₄ concentration of 6.0%, 9.5% and 14.0%

下载: 全尺寸图片幻灯片

图 4 CH₄浓度对最终温度及压力的影响

Figure 4. Effect of CH₄ concentration on the variation of final temperature and pressure

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图 5 自由基摩尔分数变化情况(初始CH₄浓度为6.0%、9.5%和14.0%)

Figure 5. Free radical mole fractions vary with time at initial CH₄ concentration of 6.0%, 9.5% and 14.0%

下载: 全尺寸图片幻灯片

图 6 甲烷到亚甲基、甲醇和甲氧基的主要历程

Figure 6. Main processes of CH₄ to

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图 7 CH₄浓度对最终自由基摩尔分数的影响

Figure 7. Effect of CH₄ concentration on final free radicals' mole fraction

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图 8 CH₄初始浓度为9.5%时影响CH₄和O₂的基元反应步

Figure 8. TKER influencing CH₄ and O₂ at initial CH₄ concentration of 9.5%

下载: 全尺寸图片幻灯片

图 9 CH₄初始浓度为14.0%时影响CH₄和O₂的基元反应步

Figure 9. TKER influencing CH₄ and O₂ at initial CH₄ concentration of 14.0%

下载: 全尺寸图片幻灯片

图 10 CH₄初始浓度为6.0%时影响CH₄和O₂的基元反应步

Figure 10. TKER influencing CH₄ and O₂ at initial CH₄ concentration of 6.0%

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图 11 CH₄初始浓度为9.5%时影响自由基的基元反应步

Figure 11. TKER influencing free radical at initial CH₄ concentration of 9.5%

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图 12 CH₄初始浓度为14.0%时影响自由基的基元反应步

Figure 12. TKER influencing free radical at initial CH₄ concentration of 14.0%

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图 13 CH₄初始浓度为6.0%时影响自由基的基元反应步

Figure 13. TKER influencing free radical at initial CH₄ concentration of 6.0%

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表 1 初始模拟计算条件

Table 1. Initial conditions of simulation

Working condition	Initial temperature/(K)	Initial pressure/(MPa)	Mole fraction/(%)			Calculating time/(ms)
Working condition	Initial temperature/(K)	Initial pressure/(MPa)	CH₄	O₂	N₂	Calculating time/(ms)
1	1 200	0.09	6.00	19.74	74.26	100
2	1 200	0.09	9.50	19.00	71.50	100
3	1 200	0.09	14.00	18.06	67.94	100

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