CH4/O2/CO2预混体系爆炸动力学研究

钟飞翔; 郑立刚; 马鸿雁; 杜德朋; 王玺; 潘荣锟

doi:10.11883/bzycj-2021-0191

CH₄/O₂/CO₂预混体系爆炸动力学研究

doi: 10.11883/bzycj-2021-0191

钟飞翔^1,,
郑立刚^{1, 2, ,},
马鸿雁¹,
杜德朋¹,
王玺¹,
潘荣锟^{1, 2}

1.
河南理工大学安全科学与工程学院瓦斯地质与瓦斯治理国家重点实验室培育基地，河南焦作 454003
2.
煤炭安全生产与清洁高效利用省部共建协同创新中心，河南焦作 454003

基金项目: 国家自然科学基金（51674104，51874120）

详细信息

作者简介:
钟飞翔（1996－　），男，硕士研究生，390057630@qq.com

通讯作者:
郑立刚（1979－　），男，博士，教授，zhengligang97@163.com

中图分类号: O381
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- 被引次数: 11
出版历程
- 收稿日期: 2021-05-14
- 修回日期: 2021-08-23
- 网络出版日期: 2021-12-01
- 刊出日期: 2022-01-20

A study of explosion dynamics of a CH₄/O₂/CO₂ premixed system

ZHONG Feixiang^1
,,
ZHENG Ligang^{1, 2
, ,},
MA Hongyan¹,
DU Depeng¹,
WANG Xi¹,
PAN Rongkun^{1, 2}

1.
State Key Laboratory Cultivation Base for Gas Geology and Gas Control, School of Safety Science and Engineering, Henan Polytechnic University, Jiaozuo 454003, Henan, China
2.
Collaborative Innovation Center of Coal Work Safety and Clean High Efficiency Utilization, Jiaozuo 454003, Henan, China

摘要

摘要: 为探究甲烷在富氧条件下的火焰动力学规律，以CH₄/O₂/CO₂预混体系为研究对象，在小尺度方形透明管道中进行了一系列爆炸实验，探讨了初始环境温度波动对爆炸参数的影响，并对预混体系的燃烧机理进行分析。结果表明：在273 K的环境温度下，化学当量比 $\varphi$ =0.8～1.0且氧气相对比γ＜0.30和 $\varphi$ =1.2且γ＜0.35的预混体系不能被点燃，而其他预混体系均可被点燃，最终产生郁金香与非郁金香两种火焰类型，并且根据郁金香火焰独特的演变特征，又划分为T形郁金香火焰和不对称郁金香火焰；随着γ的增大，无量纲火焰传播速度v/(S_Lσ)的变化趋势由“两升两降”转变为“一升一降”。初始环境温度的升高并未对火焰传播速度和爆炸超压的变化趋势产生影响，但是会导致最大爆炸超压p_max和最大火焰传播速度降低。值得注意的是，初始环境温度对爆炸强度的影响随化学当量比的减小而增强。另外，与最大爆炸超压相比，最大火焰传播速度与层流燃烧速度之间的关系更紧密。从敏感性分析中可知：层流燃烧速度对自由基链式反应R38（即H+O₂=O+OH）表现出最大的正敏感度，对R52（即H+CH₃ (+M)=CH₄ (+M)）表现出最大的负敏感度，并且对自由基OH的生成速率最敏感，当初始环境温度升高至303 K时，层流燃烧速度对R38（正）和R52（负）的敏感度降低；H、O和OH自由基总摩尔分数的增大会削弱热扩散的不稳定性，增强流体力学的不稳定性。
- 富氧甲烷 /
- 郁金香火焰 /
- 初始环境温度 /
- 敏感性分析
Abstract: In order to explore the flame dynamics of methane under oxygen-rich conditions, a series of explosion experiments were carried out in a small-scale square transparent pipe with a CH₄/O₂/CO₂ premixed system as the research object. Through the analysis of explosion parameters, the influence of the fluctuation of initial ambient temperature on explosion intensity was revealed, and the micro-combustion mechanism of premixed system was discussed. The results show that under the ambient temperature of 273 K, the mixtures with the equivalence ratio $\varphi$ from 0.8 to 1.0, the oxygen relative ratio γ＜0.30 and $\varphi$ =1.2, γ＜0.35 could not be ignited, but other premixed systems could, and tulip and non-tulip flames were produced. According to the unique evolution characteristics of the tulip flame, the tulip flame can be divided into T-shaped tulip flame and asymmetric tulip flame. As the magnitude of γ increases, the evolution of the maximum normalized flame propagation velocity shifts from a two rises-and-two drops mode to a one rise-and-one drop mode. The increase in the initial ambient temperature has no effect on the evolutions of flame propagation velocity and explosion overpressure, but it reduces the maximum explosion overpressure and the maximum flame propagation velocity. It is worth noting that when the equivalence ratio is lower, the initial ambient temperature has stronger influence on the explosion intensity. In addition, compared with the maximum explosion overpressure, the maximum flame propagation velocity displays a closer relationship with laminar burning velocity. The chemical kinetics calculations show that the laminar burning velocity is most positively sensitive to the free-radical chain reaction R38 (namely, H+O₂=O+OH) and is most negatively sensitive to R52 (namely, H+CH₃ (+M)=CH₄ (+M)), and is most sensitive to the rate of production of the free radical OH. When the initial ambient temperature increases to 303 K, the sensitivity of the laminar burning velocity to R38 (positive) and R52 (negative) are reduced. The increase in the total mole fraction of the free radicals H, O and OH weakens the thermal diffusion instability, but enhances the hydrodynamic instability.
- oxygen-enriched methane /
- tulip flame /
- initial ambient temperature /
- sensitivity analysis

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图 1 实验装置

Figure 1. Experimental facility

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图 2 火焰状态统计

Figure 2. Statistics of flame status

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图 3 郁金香火焰的3种演变模式

Figure 3. Three patterns of evolution process of tulip flames

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图 4 Lewis数和σ/δ随γ的变化趋势

Figure 4. Variation of Lewis number and σ/δ with γ

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图 5 归一化火焰传播速度与火焰前锋位置之间的关系

Figure 5. Relation between the normalized flame propagation velocity and the flame front position

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图 6 当量比为0.8时各氧气相对比下爆炸超压曲线

Figure 6. Explosion overpressure-time history for various oxygen fractions at $\varphi$ =0.8

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图 7 最大爆炸超压和最大火焰传播速度与层流燃烧速度之间的关系

Figure 7. Dependence of the maximum explosion overpressure and the maximum flame propagation velocity on laminar burning velocity

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图 8 不同初始环境温度对p_max和 ${\bar v_{{\text{max}}}}$ 的影响

Figure 8. Influence of different initial ambient temperatures on p_max and ${\bar v_{{\text{max}}}}$

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图 9 2种初始环境温度下(dp/dt)_max与S_Lσ²(σ−1)/(σ+1)的关系

Figure 9. Relationship between (dp/dt)_max and S_Lσ²(σ−1)/(σ+1) for two initial ambient temperatures

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图 10 各种氧气相对比下主要链式反应对层流燃烧速度的敏感度系数

Figure 10. Sensitivity coefficients of the main chain reactions to laminar burning velocity for various oxygen fractions

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图 11 不同初始环境温度下OH自由基的生成速率

Figure 11. Rates of production of the free radical OH at different initial ambient temperatures

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图 12 层流燃烧速度和膨胀比随自由基OH的生成速率变化

Figure 12. Variation of laminar burning velocity and expansion ratio with the rate of production of OH free radical

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图 13 火焰不稳定与H、O、OH自由基最大摩尔分数的拟合关系

Figure 13. Fitting relationship between the flame instability and the maximum mole fraction of H, O and OH radicals

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表 1 临界未点火预混体系甲烷体积分数

Table 1. Critical volume fractions of methane in unignited premixed systems

气体组分	临界未点火预混体系甲烷体积分数/%
气体组分	$\varphi$ =0.8, γ =0.25	$\varphi$ =1.0, γ =0.25	$\varphi$ =1.2, γ =0.30
O₂	22.73	22.22	25.43
CH₄	9.09	11.11	15.26

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表 2 $p_{\max}$ 和 ${\bar v_{{\text{max}}}}$ 在环境温度由 $273\;{\rm{K}}$ 升高到 $303\;{\rm{K}}$ 影响下的下降百分比

Table 2. Decrease percentage of p_max and ${\bar v_{{\text{max}}}}$ affected by ambient temperature from $273\;{\rm{K}}$ to $303\;{\rm{K}}$

γ	p_max下降百分比/%			${\bar v_{{\text{max}}}}$ 下降百分比/%
γ	$\varphi$ =0.8	$\varphi$ =1.0	$\varphi$ =1.2	$\varphi$ =0.8	$\varphi$ =1.0	$\varphi$ =1.2
0.30	21.94	31.16		32.33	30.76
0.35	43.38	38.82	16.43	29.81	30.95	30.32
0.40	34.06	31.23	4.77	49.54	40.56	8.65
0.45	34.66	22.45	10.05	41.76	17.08	10.03
0.50	26.30	27.94	14.56	14.02	10.07	8.67

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表 3 预混体系中主要的链式反应

Table 3. Main chain reactions in the premixed system

反应序号	主要链式反应	反应序号	主要链式反应
R11	O+CH₄=OH+CH₃	R98	OH+CH₄=CH₃+H₂O
R38	H+O₂=O+OH	R99	OH+CO=H+CO₂
R43	H+OH+M=H₂O+M	R119	HO₂+CH₃=OH+CH₃O
R45	H+H₂O=H₂+OH	R135	CH₂+O₂=OH+H+CO
R52	H+CH₃(+M)=CH₄(+M)	R153	CH₂(s)+CO₂=CH₂O+CO
R53	H+CH₄=CH₃+H₂	R166	HCO+H₂O=H+CO+H₂O

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