煤粉无油二级直接点火燃烧器试验研究及数值模拟  

EXPERIMENTAL STUDY AND NUMERICAL SIMULATION OF TWO-STAGE OIL-LESS IGNITION SYSTEM

作　　者：周俊虎[1] 徐江荣[2] 张巍[1] 岑可法[1] 

机构地区：[1]浙江大学能源清洁利用与环境工程教育部重点实验室,浙江省杭州市310027 [2]杭州电子科技大学理学院,江省杭州市310018

出　　处：《中国电机工程学报》2005年第11期66-71,共6页Proceedings of the CSEE

摘　　要：为掌握煤粉无油二级直接点火燃烧器内部流动、燃烧特征,进行了试验和数值模拟。详细地分析了燃烧器内部速度场、煤粉颗粒浓度场和温度场,结果表明:在燃烧器第一级,其流动特征及煤粉颗粒浓度合理分布有利于加热管道对煤粉颗粒的点燃,点燃过程中加热管道的截面上有3种不同的温度分布;燃烧器第二级内部流动特征有利于气相的混合,第二级的火焰温度比第一级更高。最后把模拟结果同实验数据进行了对比分析。该文的分析结果对于煤粉无油二级直接点火燃烧器的现场运行及其优化设计都有一定的指导作用。Experiments and numerical simulation are carried out to recognize the exact flow and combustion characteristics in a two-stage oil-less ignition system. Detailed analysis is conducted on the velocity field, the pulverized coal concentration field and temperature field, and the results indicate that: in the first stage of the two-stage oil-less ignition system, the flow characteristics and the distribution of pulverized coal concentration make for the ignition of pulverized coal by heating pipe, and during procedure of ignition there are three different kinds of temperature distribution on the cross sections of heating pipe; the flow characteristics in the second stage makes for the mixing of gas phase, and the flame temperature is higher in the second stage. Then the simulation results are compared with the experiment results. And it is believed that the results can be helpful to operation and optimizing design of two-stage oil-less ignition system.

关 键 词：直接点火燃烧器 数值模拟 二级 试验研究 煤粉颗粒 加热管道 流动特征 内部流动 燃烧特征 合理分布 颗粒浓度 温度分布 火焰温度 对比分析 实验数据 模拟结果 指导作用 优化设计 现场运行 分析结果 速度场 温度场 浓度场 

分 类 号：TQ534[化学工程—煤化学工程] TK223.23[动力工程及工程热物理—动力机械及工程]