富氧微油燃烧器的点火与稳燃特性研究  

Ignition and combustion stability of burner with tiny-oilin abundant oxygen

作　　者：李新梦[1] 高峰 姚磊[1] 李传统[1] 

机构地区：[1]南京师范大学动力工程学院,江苏南京210042 [2]河南省第五建筑安装工程集团有限公司,河南郑州450007

出　　处：《华电技术》2008年第3期14-17,36,共5页HUADIAN TECHNOLOGY

基　　金：中国矿业大学煤炭加工与高效利用教育部重点实验室资助项目(CPEUKF06-02)

摘　　要：针对燃烧低挥发分煤的点火、稳燃问题,介绍了富氧微油点火与稳燃系统的组成以及燃烧器的构造,并对其点火和稳燃机理进行了分析。采用数值计算方法模拟了富氧微油燃烧器的一次风流场,分析了富氧微油燃烧器的流场与温度场特性。分析认为富氧助燃可以提高燃烧强度、加快燃烧速度,从而大大缩短点火时间;煤粉气流经过富氧微油燃烧器喷口后,在脉动的同时又向回流区流动并向外扩散,迅速与热烟气混合,对于低挥发分煤能起到良好的稳燃作用,这一研究结果为燃煤电厂富氧微油燃烧器改造提供了理论依据。Aiming at the ignition and stabilizing combustion problem of low volatile coal, the constitution of ignition and combustion stability system and structure of burner with tiny-oil in abundant oxygen were introduced, and the principle of ignition and combustion stability was analyzed. The primary air flow field and temperature field of burning were numerically simulated and the features were further analyzed in detail. It has been verified by the analyzing that the intensity and speed of burning are improved and the time of ignition is shortened greatly with the help of abundant oxygen. After passing the nozzle of the burner, the pulverized coal - air in turbulence flows to the circulation zone and disperses in the same time, mixing rapidly with the hot flue gas, therefore favoring to the stabilizing combustion of low volatile coal. This result provides theory basis for the reform of the burner with tiny - oil in abundant oxygen in coal- fired power plant.

关 键 词：富氧微油燃烧器 点火稳燃 燃烧特点 数值计算 流场 温度场 

分 类 号：TK223.2[动力工程及工程热物理—动力机械及工程]