碳化硅泡沫陶瓷内低浓度瓦斯的燃烧特性研究
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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.
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.
引文
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[2]马向阳,黄小美,吴嫦.天然气掺氢对家用燃气灶燃烧特性的影响研究[J].可再生能源,2018,36(12):1746-1751.
[3]王海蓉,李欣欣,黄模志.生物质气化及其燃气的可替代性研究[J].可再生能源,2016,34(12):1859-1863.
[4]张铁岗.矿井瓦斯综合治理技术[M].北京:煤炭工业出版社,2000.
[5]李聪,袁隆基,丁艳,等.低浓度煤矿瓦斯的脉动燃烧技术[J].实验技术与管理,2011,28(7):57-58.
[6]宋正昶,林柏泉,周世宁.低浓度瓦斯在泡沫陶瓷内过焓燃烧的实验研究[J].煤炭学报,2011,36(4):628-632.
[7]赵益芳,阎海英,王飞,等.矿井低浓度瓦斯增浓技术的研究[J].太原理工大学学报,2001,33(1):57-60.
[8]牛国庆.矿井回风流中低浓度瓦斯利用现状及前景[J].工业安全与环保,2002,28(3):3-5.
[9] Maldaner L,Wagner-Riddle C,Vander Zaag A C,et al.Methane emissions from storage of digestate at a dairy manure biogas facility[J]. Agricultural and Forest Meteorology,2018,258:96-107.
[10] Huaming Dai,Qi Zhao,Baiquan Lin,et al. Premixed combustion of low-concentration coal mine methane with water vapor addition in a two-section porous media burner[J].Fue,2018,213:72-82.
[11] F Contarin, A V Saveliev, A A Fridman, et al. A reciprocal flow filtration combustor with embedded heat exchangers:Numerical study[J].International Journal Heat and Mass Transfer,2013,46(6):949-961.
[12] H Gao, Z Qu, Y He, et al. Experimental study of combustion in a double-layer burner packed with alumina pellets of different diameters[J].Applied Energy,2012,100:295-302.
[13]李德波,宋正昶,徐齐胜,等.泡沫陶瓷内瓦斯气体预混燃烧污染物排放规律试验研究[J].广东电力,2014,27(3):5-9.
[14]朱茜茜,程乐鸣,郑成航,等.预混气体在泡沫陶瓷多孔介质燃烧温度分布与火焰面移动特性[J].中国电机工程学报,2012,32(17):63-69.