高温氧气发生器在W火焰锅炉中的点火特性  

Ignition Characteristics of High-temperature Oxygen Generator in a W-flame Boiler

作　　者：闫高程[1] 齐心[1] 任婷[1] 刘石[1] 

机构地区：[1]华北电力大学能源动力与机械工程学院,北京102206

出　　处：《动力工程学报》2016年第5期343-351,共9页Journal of Chinese Society of Power Engineering

基　　金：智能化分布式能源系统创新引智基地资助项目(B13009);中央高校基本科研业务费专项资金资助项目(2015XS89;13XS08)

摘　　要：针对燃用无烟煤的W火焰锅炉在冷态启动过程中要消耗大量燃油的问题,提出了一种高温氧气直接点火技术:用少量燃油将氧气加热至高温状态,然后用高温氧气直接点燃无烟煤煤粉气流.利用热态点火实验和数值计算方法证明了该技术的可行性和有效性.结果表明:利用高温氧气发生器可将氧气安全可靠地加热至最高可达1 450℃的高温状态;在纯氧氛围的作用下,燃油具有瞬间燃尽的特点;高温氧气发生器出口处的温度场和氧气质量分数呈现均匀分布;当高温氧气发生器的点火热功率为700kW时,无烟煤煤粉气流的火焰温度达到1 250℃,火焰长度超过8m.To solve the problem of large oil consumption in cold start-up process of W-flame anthracite-fired boilers, a new ignition technology was proposed with the use of high-temperature oxygen. The specific way is to heat the oxygen to a high temperature with little oil, and then use the high-temperature oxygen to ignite the stream of pulverized anthracite. Hot-state experiments and numerical simulations were imple- mented to validate the feasibility and effectiveness of the proposed technology. Results show that oxygen can be safely heated to 1 450 ℃ using a high-temperature oxygen generator. In a pure oxygen environ- ment, fuel oil would burn out instantaneously. At the outlet of high-temperature oxygen generator, both the temperature and oxygen mass fraction are uniformly distributed. When the ignition heat power is 700 kW, the flame temperature of pulverized anthracite being more than 8 meters. stream would get up to 1 250 ℃, with the flame length

关 键 词：W火焰锅炉 高温氧气发生器 煤粉燃烧 点火 数值模拟 

分 类 号：TK223.2[动力工程及工程热物理—动力机械及工程]