加热炉炉底管内两相流动行为研究

Study on Vaporization and Two-phase Flow Behavior in the Bottom Tube of a Heating Furnace

基于Eulerian气-液两流体模型,采用数值模拟的方法,研究了加热炉炉底管内的汽-液两相流动行为。结果表明,在汽化冷却管中,管道的阻力损失随入口处速度的增加而增加,其变化趋势先慢后快。随着入口速度的增大,管道出口处的汽化率也逐渐增大。入口速度较小时,汽化率沿流动方向上的变化受到入口速度的影响较大;入口速度较大时,入口速度对出口处的汽化率的影响变小。入口速度过大或过小对汽化冷却系统的安全有效运行都会带来不利的影响,适宜的入口速度为6~10 m/s。

The gas-liquid two-phase flow behavior in the bottom tube of a heating furnace was studied using numerical simulation method based on Eulerian gas-liquid two fluid models.The results indicate that in the evaporative cooling pipe,the resistance loss of the pipeline increases with the increase of inlet velocity,and its variation curve is roughly parabolic in shape.As the inlet velocity increases,the vaporization rate at the outlet of the pipeline also gradually increases.When the inlet velocity is small,the variation of vaporization rate along the flow direction is greatly influenced by the inlet velocity.When the inlet velocity is large,the influence of the inlet velocity on the vaporization rate at the outlet becomes smaller.Excessive or insufficient inlet speed can have adverse effects on the safe and effective operation of the vaporization cooling system,with an appropriate inlet speed of 6-10m/s.