摘要
锅炉二次风道为有内置阻力件的一组并联大口径短通道,其阻力系数严重偏小而且风门涡流强烈,从而造成二次风强烈脉动。试验数据表明,在某些特殊工况下,二次风脉动幅度可能高达40%,对火焰稳定性影响较大。另外,同样结构的风门安装在不同的风道中,将具有不同的流量调节特征。通用的线性调节关系或等百分比调节关系的二次风门是不存在的,必须针对具体的二次风道结构进行个性化的单独设计。增加二次风道的原始阻力系数,可以使风门的调节特性得到改善并抑制流量脉动。
The secondary air duct of boilers is a group of large diameter short ducts in parallel connection, having inlet air flow condition with inner positioned resistant pieces. It’s resistant coefficient is seriously smaller, and the air damper has strong vortex, thereby, resulting in strong pulsation of the secondary air. Test Data show that the pulsating amplitude of secondary air can reach 40% under some special conditions, affecting more greatly the flame stability. In addtion, analysis shows that the air dampers of same structure installed in different air ducts would have different performance of flow rate adjustment, the secondary air damper with common linear or equal percentage adjusting characteristics isn’t existing, unique design with individuality must be made for concrete secondary air duct structure. Increasing original resistan coefficient of the secondary air duct can improve the adjusting performance of air damper, and inhibit pulsation of the flow rate.
出处
《热力发电》
CAS
北大核心
2005年第11期39-42,共4页
Thermal Power Generation
关键词
锅炉
二次风道
风门
阻力系数
脉动
流量调节
boiler
secondary air duct
air damper
resistant coefficient
pulsation
adjustment of the flow rate
