摘要
以一台200 MW旋流式煤粉炉为研究对象,以数值模拟软件FLUENT6.0为计算平台,研究了适合于旋流燃烧方式煤粉炉内流动的数值模拟方法。结果表明,在采用燃烧器和炉膛分别进行网格划分和模拟的基础上,炉膛燃烧器区域为结构化网格模拟的结果伪扩散现象比较小,而且燃烧器区域的空气流场与理论上旋流燃烧器的射流特性相一致,与实验结果相比较,回流区相对长而短些,这主要是由于二次风量的增加以及缺少钝体的作用所引起的,而在定性上,模拟得出的速度场的分布和回流区的趋势符合实验得出的数据结论,由此可见,在模拟过程中所采用的模拟方法适合于旋流燃烧方式锅炉。
This paper studies a way that adapts to simulate the aerodynamic field in swirling pulverized coal fired boilers through numerically simulating the flow process in a 200 MW swirling fired coal boiler adopting FLUENT6. 0. The results illustrate that it is exact to make the outlet date of burner as the inlet date of boiler. The false diffusion is smaller when the burner zone is simulated with regular hexahedron grid and the flow field show a good co- incidence in theory. Compared with the measurement of test, the recirculation zone is longer and narrower but the flow trend accords with the experiment result. So this simulate meas- ure adapts to study the aerodynamic field in swirling pulverized coal fired boilers.
出处
《锅炉技术》
北大核心
2008年第3期43-47,72,共6页
Boiler Technology
基金
黑龙江省科技攻关项目(GC04C213)
关键词
旋流燃烧器
回流区
空气动力场
伪扩散
swirl burner
recirculation zone
aerodynamic field
false diffusion
