摘要
介绍了一种天然气的新型脉动供燃料燃烧技术,该技术能有效降低NOx,提高传热效率,节约能源,且改造简易,运行经济;阐述了其技术原理,综述了其发展状况,指出对我国燃烧技术改进的重要意义.利用直接摄像技术,对一个采用该燃烧方式的射流火焰在不同流量脉动频率下的火焰类型和结构特征进行了研究.结果发现,随脉动频率变化出现了丰富的火焰类型.燃气脉动与系统共振特性相耦合影响火焰脉动特性,在系统共振和谐振频率附近,火焰根部出现崩溃混合,且火焰湍动升起,火焰长度变短.在某些频率下火焰直长,具有清晰的贫富燃交替结构.
Oscillating combustion was introduced as a new combustion technology for de-NOx applied in high temperature industrial process burning natural gas. Its principle and developing status were explained and reviewed. It is of significance for the innovation of combustion technology in China. A turbulent diffusion flame exploring this technique was investigated in various conditions of different oscillating frequency through direct photographs. Many various flame modes were observed and analyzed. Fuel flow rate oscillation coupled with system vibration properties strongly influences flame oscillation characteristics. Near resonant and syntonic frequency collapsible mixing occurs in the flame foot and the flame get lift-off and shortened. Under some frequency the flame get straight and long with regular alternative fuel-rich and fuel-lean structures.
出处
《燃烧科学与技术》
EI
CAS
CSCD
2004年第5期459-464,共6页
Journal of Combustion Science and Technology
关键词
脉动供燃料燃烧
火焰特征
交替火焰结构
Combustion
Environmental protection
Natural gas
Photography
Thermal diffusion
