碳化硅泡沫陶瓷内低浓度瓦斯的燃烧特性研究  

Study on combustion characteristics of low-concentration coal mine methane in SiC foam ceramics

作　　者：丁艳[1] 袁隆基 宋正昶 Ding Yan;Yuan Longji;Somg Zhengchang(Xuhai College of China University of Mining and Technology, Xuzhou 221008, China;School of Electrical and Power Engineering, China University of Mining and Technology, Xuzhou 221116, China)

机构地区：[1]中国矿业大学徐海学院,江苏徐州221008 [2]中国矿业大学电气与动力工程学院,江苏徐州221116

出　　处：《可再生能源》2019年第6期791-795,共5页Renewable Energy Resources

基　　金：国家自然科学基金重点资助项目(50534090)

摘　　要：文章搭建了碳化硅泡沫陶瓷低浓度瓦斯燃烧实验台,研究了不同孔隙密度的碳化硅泡沫陶瓷内低浓度瓦斯燃烧时的温度分布及不同当量比瓦斯燃烧时的火焰传播速度,分析了碳化硅泡沫陶瓷的孔隙密度对低浓度瓦斯燃烧特性的影响。研究结果表明:碳化硅泡沫陶瓷的孔隙密度与碳化硅泡沫陶瓷的表面温度以及碳化硅泡沫陶瓷内的火焰传播速度均不呈正相关,当碳化硅泡沫陶瓷的孔隙密度由10 PPI依次增加到20,30,40PPI时,碳化硅泡沫陶瓷的表面温度呈现出先升高再降低最后又升高的变化趋势;碳化硅泡沫陶瓷内的火焰传播速度随着碳化硅泡沫陶瓷表面温度的升高而增大,不同孔隙密度的碳化硅泡沫陶瓷内火焰传播速度的大小顺序为20 PPI>40 PPI>30 PPI>10 PPI;辐射消光系数和比表面积均居于中间的孔隙密度为20 PPI的碳化硅泡沫陶瓷的综合换热效果最好,具有上游温升快,下游温降慢的特点。In order to research the combustion characteristics of low-concentration coal mine methane, a porous medium combustion experimental platform with SiC foam ceramic as the inner core of the combustor was set up. The temperature distribution law and flame propagation speed in different density of porous SiC foam ceramics were studied, and the influence of pore density on the combustion characteristics of low concentration gas was analyzed. The results show that the pore density of SiC foam ceramics is not positively correlated with the surface temperature and flame propagation speed.When the pore density increases from 10 PPI to 20,30,40 PPI, the surface temperature of SiC foam ceramics presents a trend of increasing at first and then decreasing and finally increasing again. The flame propagation speed is in the order of 20 PPI >40 PPI >30 PPI >10 PPI in the SiC foam ceramics.Because of the radiation extinction coefficient and specific surface area in the middle, SiC foam ceramic with the pore density of 20 PPI has the best heat transfer effect, which has the characteristics that the upstream temperature rises rapidly and the downstream temperature drops slowly.

关 键 词：碳化硅泡沫陶瓷 低浓度瓦斯 温度分布 火焰速度 

分 类 号：TK6[动力工程及工程热物理—生物能]