Turbulent flame propagation limits of polymethylmethacrylate particle cloud-ammonia-air co-combustion
Turbulent flame propagation limits of polymethylmethacrylate particle cloud-ammonia-air co-combustion
复制标题
聚甲基丙烯酸甲酯颗粒云-氨-空气共燃烧的湍流火焰传播极限
DOI：
10.1016/j.proci.2022.08.098
复制
发表时间：
2023
影响因子：
3.4
通讯作者：
Fujita Osamu
中科院分区：
文献类型：
--
作者：
Xia Yu;Hashimoto Nozomu;Fujita Osamu
氨是实现碳中和社会的一种非常有前途的能源载体。固体颗粒云-氨的共燃被认为是减少二氧化碳排放的有效可行的方法。了解固体颗粒云-氨两相混燃过程中的湍流火焰稳定和扩散过程是将混燃技术应用于燃烧室的关键。据我们所知，这是第一个研究，以描述湍流火焰传播的限制和相关的机制上的固体颗粒云-氨-空气的共燃。为了研究固体颗粒云-氨气-空气混合燃烧的湍流火焰传播极限和相关机理，采用新型风扇搅拌等容容器对SiO2颗粒云-氨气-空气混合燃烧和PMMA颗粒云-氨气-空气混合燃烧进行了湍流火焰传播实验.结果表明，添加惰性二氧化硅颗粒收缩了预混氨-空气混合物的湍流火焰传播极限。然而，添加PMMA颗粒扩大，然后收缩的预混氨-空气混合物的湍流火焰传播极限的氨当量比增加，从贫到富。在固体颗粒云-氨-空气混合燃烧中，活性颗粒对预混氨-空气混合物湍流火焰传播极限的影响主要表现为两种类型：一是在火焰前缘预热区加入预热颗粒挥发分引起的局部当量比增加效应，二是未燃颗粒引起的热沉负效应。
Ammonia is a highly promising energy carrier for achieving a carbon-neutral society. The co-combustion of solid particle clouds–ammonia, in particular, is considered an efficient and feasible method of reducing carbon dioxide emissions. Understanding turbulent flame stabilization and extinguishment processes during the two-phase hybrid-mixture co-combustion of solid particle clouds–ammonia is essential for the co-combustion technology to be used in combustors. To the best of our knowledge, this is the first study to describe the turbulent flame propagation limits and associated mechanism on the co-combustion of solid particle clouds–ammonia–air. Turbulent flame propagation experiments on silica particle clouds–ammonia–air mixing combustion and polymethylmethacrylate (PMMA) particle cloud–ammonia–air co-combustion were conducted in this work using a novel fan-stirred constant-volume vessel to clarify the turbulent flame propagation limits and associate mechanism of solid particle cloud–ammonia–air co-combustion. Results showed that adding inert silica particles contracted the turbulent flame propagation limits of premixed ammonia–air mixtures. However, adding PMMA particles expanded and then contracted the turbulent flame propagation limits of a premixed ammonia–air mixture as the ammonia equivalence ratio increased from lean to rich. In the solid particle cloud–ammonia–air co-combustion, reactive particles induce two types of effects on the turbulent flame propagation limits of premixed ammonia–air mixtures: The local equivalence ratio increment effect is caused by adding volatile matter from preheated particles in the preheat zone of the flame front, and the heat sink negative effect is induced by the unburned particles.