摘要
建立了锅炉二次风箱到炉膛出口的压降计算模型,基于该模型,给出锅炉二次风挡板特性冷态试验数据的处理方法:挡板在100%开度下的阻力系数作为已知常数,采用该开度状态下二次风箱到炉膛出口压降的试验结果,确定炉膛阻力系数;再利用其它挡板开度下的试验数据,得到挡板不同开度下的阻力系数。根据炉膛和挡板的阻力系数以及风箱-炉膛差压测量值,可以确定热态运行时各个二次风喷口的风速,这使得对炉内风粉分布的监测成为可能,对于低NO_x燃烧系统,炉内风粉分布监测和调整是优化锅炉燃烧,减少汽温波动的重要手段。
A model for calculating the flow resistance from the secondary air chamber to furnace exit in boiler was established,then data processing procedure of air damper characteristics test was put forward accordingly: assuming the local resistance coefficient under 100% baffle opening is known as constant,furnace resistance coefficient is calculated from this fully opening damper test,then,resistance coefficients under other openings are obtained according to the furnace resistance coefficient. These coefficients can be used to calculate velocity in secondary air nozzles when boiler is put into operation. This makes it possible of monitoring of air and fuel distribution along furnace height,which has remarkable significance for optimizing boiler combustion and. reducing steam temperature fluctuations.
出处
《热能动力工程》
CAS
CSCD
北大核心
2016年第10期115-121,130,共7页
Journal of Engineering for Thermal Energy and Power
关键词
锅炉
二次风
挡板特性
二次风喷嘴风速
boiler
secondary air
damper resistance characteristics
velocity in secondary air nozzles
