加压富氧下单煤粉颗粒燃烧的光学诊断研究  

The Optical Diagnostics of the Pressurized Oxy-fuel Combustion of single Coal Particle

作　　者：陈前云 秦丁益 栗晶[1] 柳朝晖[1] CHEN Qianyun;QIN Dingyi;LI Jing;LIU Zhaohui(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》2022年第8期2179-2185,共7页Journal of Engineering Thermophysics

基　　金：国家重点研发计划(No.2019YFE0100100)。

摘　　要：加压富氧环境下煤粉的着火燃烧特性研究,对于工业锅炉和燃烧器的安全与稳定运行具有十分重要的指导意义。本文基于加压携带流式反应器,通过宏观与微观拍摄相结合的方式,对神府煤在0.1~0.5 MPa加压富氧环境下的着火与燃烧特性进行了研究。结果表明:加压下挥发分着火延后但燃尽加快,且在挥发分燃烧后期火焰呈现不规则形态,促进了焦炭的着火;加压下更低的氧扩散率抑制了焦炭的燃尽。The study on ignition and combustion characteristics of pulverized coal under pressurized oxy-fuel conditions is very important for the safety and stability in the operation of the industrial boilers. Based on a pressurized entrained-flow reactor, the ignition and combustion characteristics of Shenfu coal under 0.1~0.5 MPa oxy-fuel conditions were studied by combining macroscopic and microscopic photography. The results show that the ignition of volatiles is delayed but the combustion is accelerated under pressurized atmosphere, and the volatile flame appears irregular shape at the later stage, which promotes the ignition of coal char. Furthermore, the lower mass-transfer coefficient of oxygen under elevated pressure inhibits the burnout of char.

关 键 词：加压富氧 平面火焰燃烧器 光学诊断 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]