Pressure history in the explosion of moist syngas/air mixtures
Pressure history in the explosion of moist syngas/air mixtures
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DOI：
10.1016/j.fuel.2016.07.072
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发表时间：
2016-12
期刊：
影响因子：
7.4
通讯作者：
Yongliang Xie;Jinhua Wang;Xiao Cai;Zuo-hua Huang
中科院分区：
文献类型：
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作者：
Yongliang Xie;Jinhua Wang;Xiao Cai;Zuo-hua Huang
记录高温下在大范围当量比下添加 H2O 的合成气/空气混合物爆炸的压力历史，以研究恒定体积密闭容器中的爆炸特性。合成气中CO摩尔分数为0.5至0.95，初始温度为373 K至473 K，H2O添加比例为0至30%。通过实验获得了爆炸压力、爆炸时间、最大压力上升速率、爆燃指数等爆炸参数。考察了当量比、初始温度、CO/H2比和稀释比对爆炸参数的影响。这些参数是评估爆炸危险和设计燃烧容器的重要输入属性。此外，假设火焰传播是一个恒定体积的绝热过程，还计算了绝热爆炸压力。结果表明，实验确定的归一爆炸压力和归一绝热爆炸压力随着CO/H2比的增加呈现出不同的趋势。实验确定，随着合成气混合物中CO/H2比例的增加，归一爆炸压力降低，但归一绝热爆炸压力增加。这主要是因为CO/H2比较高的混合物的热损失较大。最后，通过实验压力与绝热爆炸压力之差计算燃烧过程的热损失。随着混合物中CO稀释比例的增加，传递到壁面的热量损失量以及单位面积的热量损失大大增加。
The pressure history in the explosion syngas/air mixtures with H2O addition over a wide range of equivalence ratios at elevated temperatures was recorded to study the explosion characteristics in a constant volume confined vessel. CO mole fractions in syngas are from 0.5 to 0.95, initial temperatures are from 373 K to 473 K, and H2O addition ratios are from 0 to 30%. The explosion parameters such as explosion pressure, explosion time, maximum rate of pressure rise, and deflagration index are obtained from the experiment. Effects of the equivalence ratio, initial temperature, CO/H2ratio and dilution ratio on the explosion parameters are examined. These parameters are important input properties for evaluation of hazards of the explosion and the design the combustion vessel. In addition, the adiabatic explosion pressure is also calculated assuming the flame propagation is a constant-volume and adiabatic process. Results show the experimentally determined normalized explosion pressure and the normalized adiabatic explosion pressure show different trends with the increase of CO/H2ratio. The experimental determined normalized explosion pressure decreases but normalized adiabatic explosion pressure increases with the increase of CO/H2ratio in the syngas mixture. This is mainly because the heat loss is larger for the mixture with a higher CO/H2ratio. At last, the heat loss during the combustion process was calculated by the difference between experimental and adiabatic explosion pressure. With the addition of CO dilution ratio in the mixture, the amount of heat loss transferred to the wall heat loss to the unit area increases greatly.