摘要
以往作为衡量旋流燃烧器稳燃性能的指标通常有回流区的尺寸(长度和宽度)、回流量、煤粉浓度等参数,而对煤粉气流在炉内与回流区高温流体混合的早晚及混合强度未曾提及。该文提出了掺混系数这一新概念,用以衡量煤粉与高温回流烟气之间掺混速度和掺混强度。应用数值模拟的方法得到扩流锥稳燃器、花瓣稳燃器和普通旋流燃烧器及花瓣燃烧器的流场,并对其掺混系数进行了分析与研究。同时给出了花瓣燃烧器和普通燃烧器在燃烧贫煤时55%负荷下的温度分布。研究得出掺混系数可以很好地反应回流区边界上的掺混程度,为旋流燃烧器的设计提供了新的依据。
The stable combustion of swift burner is assessed usually by the size of the Central Recirculation Zone （CRZ）, the recirculated mass and the concentration of pulverized coal flow, while the mixed time and intensity between high temperature flue gas and the pulverized coal are not considered. This paper puts forward the concept of ＂mixed coefficient＂ that is used as the assessment of the mixed speed and intensification between the pulverized coal-air flow and the recirculation high temperature gas. Through the mathematics simulation, the mixed coefficients of the general bluff-body stabilizer, the Petal Flame Stabilizer, and the common swift burner and Petal Swirl Burner are analyzed. And this paper discussed the temperature distribution of common swirl burner and petal swift burner bum semi-anthracite at 55% load. The results show that the ＂mixed coefficient＂ can perfectly predict the mixing of the boundary of CRZ, which is important to deepen the investigation in stable combustion and flow field for swift burner.
出处
《中国电机工程学报》
EI
CSCD
北大核心
2006年第23期95-99,共5页
Proceedings of the CSEE
关键词
热能动力工程
旋流燃烧器
掺混系数
稳燃
花瓣稳燃器
花瓣燃烧器
thermal power engineering
swirl burner
mixed coefficient
stable combustion
petal flame stabilizer
petal swirl burner
