加压富氧条件下单烟煤颗粒的着火燃烧特性  

Pressurized Oxy-fuel Combustion Characteristics of Pulverized Coal Particle

作　　者：王昱升 陈前云 栗晶[1] 柳朝晖[1] 黄晓宏[1] WANG Yu-Sheng;CHEN Qian-Yun;LI Jing;LIU Zhao-Hui;HUANG Xiao-Hong(State Key Laboratory of Coal Combustion,Huazhong University of Science and Technology,Wuhan 430074,China)

机构地区：[1]华中科技大学煤燃烧国家重点实验室,武汉430074

出　　处：《工程热物理学报》2020年第9期2299-2304,共6页Journal of Engineering Thermophysics

基　　金：国家重点研发计划(No.2018YFB0605300)。

摘　　要：本文利用自行研发的加压可视化平面火焰携带流反应系统,通过激光辅助显微高速摄像,结合颗粒轨迹追踪算法,详细研究了1400 K、0.1~0.5 MPa压力下,富氧和空气气氛中微米级离散烟煤颗粒的着火燃烧特性。结果表明,随着压力上升,挥发分析出受到抑制,氧扩散速率降低,烟煤颗粒的着火延迟时间增大,挥发分燃烧阶段推迟,并且加压条件下的挥发分火焰温度更高;此外,相同压力和相同氧浓度下,富氧气氛对于煤粉的着火具有抑制作用。The ignition and combustion characteristics of pulverized bituminous coal particles was investigated by the pressurized optical accessible flat-flame reaction experimental system through a laser-assisted microscopic high-speed camera,with the ambient pressure from 0.1 MPa to 0.5 MPa and temperature at 1400 K.The results show that as the pressure rises,the ignition and volatile combustion is delayed because the volatile release rate and the oxygen diffusion rate is reduced,and the volatile flame temperature under pressurized conditions is higher.In addition,under the same pressure and the same oxygen concentration,the oxy-fuel atmosphere can inhibit the ignition of bituminous coal particles.

关 键 词：加压富氧燃烧 单煤粉颗粒 着火特性 平面火焰燃烧器 光学诊断 

分 类 号：TK16[动力工程及工程热物理—热能工程]