Effect of Nitrogen and Water Vapor on Methane-Air Mixture ExplosionElementary Reaction and Suppression Mechanism
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摘要: 为了揭示氮气和水蒸气抑爆化学动力学机理, 更有效地抑制瓦斯爆炸的发生, 采用化学动力学软件研究了不同浓度氮气和水蒸气条件下瓦斯爆炸压力、温度和达到最大压力的时间, 对比了不同浓度的氮气和水蒸气对瓦斯爆炸主要基元反应速率的影响, 分析了氮气和水蒸气的抑爆机理。研究表明, 氮气和水蒸气的加入能有效抑制瓦斯爆炸基元反应速率, 水蒸气对基元反应速率的抑制效果优于氮气, 且水蒸气的加入会增大系统中OH·自由基的含量。研究结果对揭示氮气和水蒸气的抑爆机理具有一定理论意义。Abstract: To reveal the suppression chemical mechanism of nitrogen and water and to prevent the methane-air explosion more effectively, we designed different schemes with different concentrations of nitrogen and water vapor, and simulated the pressure, temperature and time to peak pressure of the methane-air explosion using a chemical kinetic software.We compared the reaction rates of main elementary reactions of different schemes, and analyzed the suppression chemical kinetics mechanism.The results show that both the nitrogen and the water vapor can effectively suppress the elementary reaction rate of the explosion, and the water vapor is more efficient than the nitrogen.Meanwhile, the concentration of free radical OH· will increase with water vapor as the inert gas.This research results can provide reference for the study of the explosion suppression of methane-air mixture.
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Key words:
- methane-air explosion /
- simulation /
- explosion suppression /
- reaction rate /
- elementary reaction
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图 1 不同方案下爆炸最高温度
Figure 1. Max temperature for differentinert additives during explosion
图 3 不同方案下爆炸达到最大压力的时间
Figure 3. Time to peak pressure for differentinert additives during explosion
图 4 方案1中OH·自由基生成速率随时间的变化
Figure 4. Production rate of OH· free radicalduring explosion in scheme 1
图 5 方案2中OH·自由基生成速率随时间的变化
Figure 5. Production rate of OH· free radicalduring explosion in scheme 2
图 6 方案3中OH·自由基生成速率随时间的变化
Figure 6. Production rate of OH· free radicalduring explosion in scheme 3
图 7 方案4中OH·自由基生成速率随时间的变化
Figure 7. Production rate of OH· free radicalduring explosion in scheme 4
图 8 方案5中OH·自由基生成速率随时间的变化
Figure 8. Production rate of OH· free radicalduring explosion in scheme 5
表 1 每种方案中各物质的摩尔分数
Table 1. Mole fraction of every species in each scheme
Scheme Mole fraction CH4 O2 N2 H2O (gas) 1 0.095 0 0.190 0 0.715 0 0 2 0.071 2 0.142 3 0.786 5 0 3 0.047 3 0.094 7 0.858 0 0 4 0.071 2 0.142 3 0.715 0 0.071 5 5 0.047 3 0.094 7 0.715 0 0.143 0 
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表 2 不同方案下爆炸主要基元反应的最大反应速率
Table 2. Maximum reaction rate of main elementary reactions during explosion of each scheme
Elementary reaction Maximum reaction rate/(kmol·m-3·s-1) Scheme 1 Scheme 2 Scheme 3 Scheme 4 Scheme 5 O·+H2$\rightleftharpoons $H·+OH· 90.929 36.751 10.328 29.536 6.058 O·+CH3·$\rightleftharpoons $H·+CH2O 33.959 13.633 3.608 11.462 2.430 H·+O2$\rightleftharpoons $O·+OH· 233.232 93.227 25.150 82.215 18.646 H·+CH4$\rightleftharpoons $CH3·+H2 39.482 15.471 4.189 13.453 2.954 H·+CH2O$\rightleftharpoons $HCO·+H2 40.330 15.368 3.881 13.380 2.841 OH·+H2$\rightleftharpoons $H·+H2O 155.618 68.829 20.413 55.081 12.407 OH·+CH4$\rightleftharpoons $CH3·+H2O 27.586 10.600 2.749 10.841 2.960 OH·+CO$\rightleftharpoons $H·+CO2 79.483 33.882 10.016 36.581 11.732
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