Wang Mengming, Wen Xiaoping, Zhang Sumei, Wang Fahui, Zhu Qifeng, Pan Rongkun, Ji Wentao
School of Mechanical and Power Engineering, Henan Polytechnic University, Jiaozuo 454003, PR China.
College of Safety Science and Engineering, Henan Polytechnic University, Jiaozuo 454003, PR China.
ACS Omega. 2020 Aug 6;5(32):20643-20652. doi: 10.1021/acsomega.0c03055. eCollection 2020 Aug 18.
The effect of metal foam mesh on flame propagation of biomass-derived gas in a half-open duct was studied. The explanations are based essentially on the experimental investigations of premixed biomass-derived gas explosions carried out in a rectangular half-open combustion chamber. The initial temperature and pressure were 300 K and 1.0 atm, respectively. The key parameters of explosive characteristics, such as flame propagation images and explosive overpressure, were analyzed by changing the porosity, the pore density of porous metal foams, and the gas components. The results show that the use of porous metal foam has a significant inhibitory effect on the gas explosion. Although the combustion structure of the flames is similar, the action of the porous metal foam during the experiment also shows the characteristics consistent with the obstacles. When the porosity of the porous foam is 97%, the flame can be stimulated to produce turbulence, and then the shock-flame interaction generated by the reflection of the lead shock wave can enhance the explosion propagation and promote the explosion escalation. However, with the increase of hole density, the existence of the porous metal foam by momentum loss and heat loss to curb the spread of the explosion not only hindered the flow of not flammable but also extracted energy from the expansion of the combustion products at the same time. This study also confirms that the biological hydrogen and methane component has a vital role in the flame, and a reasonable hydrogen and methane ratio can improve the flame burning to get more economic value.
研究了金属泡沫网对生物质衍生气体在半开放管道中火焰传播的影响。这些解释主要基于在矩形半开放燃烧室中进行的预混生物质衍生气体爆炸的实验研究。初始温度和压力分别为300 K和1.0 atm。通过改变多孔金属泡沫的孔隙率、孔密度和气体成分，分析了爆炸特性的关键参数，如火焰传播图像和爆炸超压。结果表明，多孔金属泡沫的使用对气体爆炸有显著的抑制作用。虽然火焰的燃烧结构相似，但多孔金属泡沫在实验过程中的作用也表现出与障碍物一致的特性。当多孔泡沫的孔隙率为97%时，火焰会被激发产生湍流，然后由先导冲击波反射产生的激波-火焰相互作用会增强爆炸传播并促进爆炸升级。然而，随着孔密度的增加，多孔金属泡沫通过动量损失和热损失来抑制爆炸传播，这不仅阻碍了不可燃物质的流动，同时也从燃烧产物的膨胀中提取能量。本研究还证实了生物氢和甲烷成分在火焰中起着至关重要的作用，合理的氢甲烷比可以改善火焰燃烧以获得更多经济价值。
