不同煤种下单颗粒煤粉着火特性研究  

Single Particle Ignition of Different Rank Coals

作　　者：陈前云 王昱升 栗晶[1] 卢科[1] 柳朝晖[1] CHEN Qian-Yun;WANG Yu-Sheng;LI Jing;LU Ke;LIU Zhao-Hui(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8期2052-2058,共7页Journal of Engineering Thermophysics

基　　金：国家重点研发计划(No.2018YFB0605300)。

摘　　要：煤粉颗粒的着火特性研究对于工业锅炉中煤的高效清洁利用和燃烧器稳定安全的运行具有十分重要的作用。本文基于平面火焰燃烧器,搭建了连续激光辅助高速摄像的光学测量系统,并结合自行开发的颗粒识别与追踪算法、着火时间判定方法、双色测温法等方法,开展了对不同煤种着火方式、着火延迟、着火温度等特性的研究。结果表明:烟煤和褐煤的着火方式为均相着火,且褐煤在脱挥发分过程中存在煤粉颗粒破碎的情况,而无烟煤的着火方式为异相着火;煤等级越低的煤着火延迟时间越短,着火时颗粒温度越低,着火越容易。The study on the ignition characteristics of pulverized coal particles plays an important role in the efficient clean utilization of coal in industrial boilers and the stable and safe operation of burners.Based on the flat-flame burner,this paper builds an optical measurement system composed of a continuous laser and a high-speed camera.A self-developed particle recognition and tracking algorithm,combining with an ignition time determination method and two-color method,was used to study the ignition characteristics of different rank coals,such as ignition delay time and ignition mode.The results show that bituminous coal and lignite is homogeneously ignited,and the devolatilization process causes particle fragmentation in lignite,while anthracite is heterogeneously ignited;the low rank coal shows shorter ignition delay time and lower ignition temperature,meaning easier to ignite.

关 键 词：平面火焰燃烧器 高速摄像 单颗粒煤粉 着火特性 

分 类 号：TK16[动力工程及工程热物理—热能工程]