蒸汽冷却器采用分流孔支撑板的流场特性研究

Study on Flow Field Characteristics of Steam Cooler Supporting Plate with Split Flow Hole

随着机组蒸汽参数的提高,蒸汽冷却器中蒸汽流速越来越大,对管束的冲刷较严重,且易诱导管束振动导致管束爆管。研究了一种分流孔支撑板结构,通过分流孔支撑板降低蒸汽冲刷管束的流速,使管束区流体分布均匀,减小流动死区。对此分别研究了分流孔通流面积、分流孔位置、支撑板弓形缺口率对管束区流场分布的影响,得到分流孔通流面积比27.8%~38.8%,分流孔位置距离管束区150 mm,支撑板弓形缺口率在40%~50%之间时,管束区流场分布较均匀,流体流动死区少,流体最大流速降幅达9.1%。

With the increase of steam parameters,the steam velocity in the steam cooler is increasing,the tube bundle is scoured seriously,and the tube bundle vibration is easy to induce tube bundle explosion.A structure of shunt orifice support plate is studied.Through the plate reduces the flow velocity of steam,makes the fluid distribution uniform in the tube bundle area and reduces the dead zone of flow.Then study the flow area of the shunt orifice,the location of the shunt orifice and the arcuate notch ratio of the support plate on the flow field distribution in the bundle area.The results showed that the flow area ratio of the shunt orifice was 27.8%~38.8%,the location of the shunt orifice was 150 mm away from the bundle area,and the arcuate notch ratio of the support plate was 40%~50%.The flow field distribution in the bundle area was uniform,the dead zone of fluid flow was few,and the maximum velocity drop of fluid was 9.1%.