摘要
数值模拟了一种偏流块与弯管组合结构的煤粉燃烧器,其偏流块的位置异于浓淡型燃烧器,可以实现出口浓度分布均匀。改变偏流块的角度和位置,研究偏流块角度和位置变化对反浓淡效果的影响以及阻力变化。采用Euler-Lagrange方法研究气固两相流动,气相湍流采用RNG k-ε湍流模型模拟方法,固相湍流采用离散随机游动(DRW)模型。结果表明,在弯管后煤粉气流浓侧加装偏流块,可以实现一次风出口浓度分布均匀,高浓度区域不贴壁,No.16结构的燃烧器出口煤粉分布均匀,反浓淡性能好。
A pulverized coal combined of bumping separator and elbow has been numerically simulated.The burner can achieve uniform distribution of the export concentration and its bumping separator is located in different place compared with other fuel rich-lean burners.Change the bumping separator′s angle and location and investigate the effect on coal distribution in the burner outlet.Euler-Lagrange method is employed to study the gas-solid two phase flow.Gas-phase is simulated in RNG k-ε model and solid-phase in Discrete Phase Model(DPM).The results show that,behind the elbow installing a bumping separator can achieve a uniform distribution in export and the high concentrations region non-adherent.the anti-bias performance of NO.16 is very better.
出处
《节能》
2011年第11期44-48,4,共5页
Energy Conservation
关键词
气固两相流动
偏流块
浓度分布
DPM模型
gas-solid flow
bumping separator
concentration distribution
DPM model
