摘要
基于一种新型排烟冷却塔烟气排放方式,将净烟气向冷却塔内排放定义为浮力射流问题。首次建立双曲线烟塔柱体三维、定常、不可压缩黏性多组分传输流动的数学模型。采用标准k-ε湍流模型封闭N-S时均方程,同时耦合多组分扩散和热扩散。通过模拟对比发现:改进后的烟塔避免了双平行烟道间低压区产生的气流扰动;降低了因湿热空气没有有效包裹烟气而造成烟塔喉部腐蚀的可能性;使排放烟气温度梯度明显,高温区呈现单峰特性,抬升性能得到改善。
On the basis of a new exhaust modes of natural draft cooling tower（ NDCT） under flue gas injection,the emission of purified flue gas in NDCT is defined as buoyant jet combined with operation parameters. The three-dimensional multicomponent transport mathematical model of steady incompressible viscous flow in hyperbolic NDCT under flue gas injection is firstly established. The Navier-Stokes time-averaged equation coupled multi-component diffusion and thermal diffusion is solved by using the standard k-ε turbulence model. The simulation shows that the improved NDCT under flue gas injection avoids air disturbance caused by low-pressure zone between parallel gas duct. The possibility of corrosion on its throat without effectively wrapped by hot and humid air is reduced,the temperature gradient of purified flue gas becomes distinct,high temperature zone shows a single peak and uplifting performance is improved.
出处
《环境工程》
CAS
CSCD
北大核心
2015年第9期78-83,45,共7页
Environmental Engineering
基金
吉林省教育厅科学技术研究"十二五"规划项目(211)
吉林师范大学硕博启动项目(吉师硕2011013)
关键词
排烟冷却塔
自然通风冷却塔
净烟气
CFD
NDCT under flue gas injection
natural draft cooling towers
purified flue gas
CFD
