锆粉空气预混物多管喷射燃烧的火焰温度特征  

Flame Temperature Characteristics of Multi-Tube Injection Combustion of Zirconium-Air Cloud Mixtures

作　　者：王秋红[1,2] 孙金华[1] 周琪[1] 徐耀[3] 朱红亚[1] 张英[1] 

机构地区：[1]中国科学技术大学火灾科学国家重点实验室,合肥230026 [2]西安科技大学能源学院,西安710054 [3]中国科学院山西煤炭化学研究所煤转化国家重点实验室,太原030001

出　　处：《燃烧科学与技术》2012年第5期448-455,共8页Journal of Combustion Science and Technology

基　　金：国家自然科学基金资助项目(50976110)

摘　　要：在自行设计的粉尘云连续吹喷预混燃烧实验系统上,对锆粉云喷射火焰的温度特性开展研究,分析了锆粉云喷射火焰的火焰发射率和温度场分布.采用点温度和场温度相结合的方法得到328.48,g/m3、410.35,g/m3和483.59,g/m33种质量浓度锆粉云喷射火焰的发射率分别为0.20、0.19和0.18,火焰最高温度可分别达到2,147.5,℃、2,248.1,℃、2,377.8,℃.同时发现沿火焰轴向高度上,火焰温度呈升高—降低—小幅回升趋势,温度回升发生在火焰间歇区,最高温度出现在火焰下部距燃烧器出口约5,cm处.The flame temperature characteristics of multi-tube injection combustion of zirconium-air cloud mixtures were investigated by means of self-designed experimental system of continuance spray combustion of premixing dust cloud. The flame emissivity and the temperature distribution of spray flame of zirconium-air cloud mixtures were analyzed by comparing point temperature with area temperature. The analytical results indicate that the flame emissivity of zirconium-air cloud mixtures with the dust concentration of 328.48 g/m3, 410.35 g/m3, 483.59 g/m3 is 0.20, 0.19 and 0.18, respectively, and the maximum flame temperature is 2 147.5℃, 2248.1 ℃ and 2377.8 ℃, respectively. Experiments also show that the tendency of flame temperature towards the central axis of flame is increase-decrease-slight increase, the slight increase of flame temperature occurrs in the flame intermission area, and the maximum flame temperature occurs at the place about 5 cm centimeters from the outlet of combustion device.

关 键 词：锆粉云 喷射燃烧 火焰温度 发射率 

分 类 号：TK16[动力工程及工程热物理—热能工程]