锅炉技术2024，Vol.55Issue(2)：15-19,31,6.
切向燃烧煤粉锅炉二次风系统气体-飞灰颗粒流动特性研究
Study on Air-Fly Ash Particles Flow Characteristics in Secondary Air System of Tangentially Fired Pulverized Coal Boiler
摘要
Abstract
The secondary air system is an important part of the combustion system of pulverized coal boiler.The deposition of fly ash particles carried in the air of the secondary air system will affect the air flow characteristics,and even affect the safe operation of the boiler.In this paper,the secondary air system of a 350 MW supercritical tangentially fired pulverized coal boiler is taken as the research object,and the air-fly ash particle flow characteristics are calculated and analyzed by numerical simulation.The calculation results show that under the condition of equal air distribution mode of secondary air baffle opening,the auxiliary air velocities of the middle four layers are basically the same,and the air flow rate of the SOFA of the three layers accounts for 38.4%of the total secondary air.When the opening of each secondary air baffle is unchanged,the change of the secondary air inlet velocity(secondary flow rate)has little influence on the air flow rate distribution of each burner nozzle.Due to gravity,the fly ash particles flow downward after entering the windbox,and the larger the particles are,the more obvious the trend is.The ash content of auxiliary air in layer AA is large,so the water wall near this nozzle outlet is easy to wear.Fly ash particles are easy to deposit at the windbox bottoms of No.2 and 3 corners,so it is necessary to design ash discharge pipe reasonably at the bottom.关键词
四角切圆燃烧/二次风管道/大风箱/飞灰颗粒/沉积Key words
tangentially fired/secondary air duct/windbox/fly ash particles/deposit分类
能源科技引用本文复制引用
刘兴,袁东辉,付喜亮,刘贵喜,孟浩,赵凯,孙利..切向燃烧煤粉锅炉二次风系统气体-飞灰颗粒流动特性研究[J].锅炉技术,2024,55(2):15-19,31,6.基金项目
内蒙古电力科学研究院项目(510241210023) （510241210023）
