摘要
以某1 000MW机组为例,利用Fluent软件对凝汽器水侧的流场特性进行了数值模拟.结果表明:循环水在高压凝汽器和低压凝汽器前水室产生的较大漩涡区和循环水对管板的冲击,增加了循环水的阻力损失,影响了管束区水速的分布;在进口水室加装导流板和隔板上加装凸起扣板后,水室内的漩涡区明显减小,水速变得均匀平顺,循环水对隔板冲击现象明显减弱,且沿着凸起扣板方向进入管束,管束区平均水速提高了0.033m/s,整体平均传热系数增大了28 W/(m^2·K),改善了凝汽器水侧管束的传热效果.
Taking a 1 000 MW unit as an example, numerical simulations were conducted on flow characteristics at its condenser water side using Fluent software. Results show that the large vortex produced by circulating water in the water chamber of high- and low-pressure condenser and the impact of circulating water on the tube plate would lead to the increase of resistance loss and the non-uniform distribution of water velocity in tube bundle areas; the phenomenon of water swirl can be significantly reduced by adding guiding plates and convex buckles in the water chamber, where the water velocity would become uniform and smooth, the impingement on baffle plate would be weakened, and the water would flow into the tube bundle along the direction of convex buckles, resulting in increased average water velocity by 0. 033 m/s and raised overall heat-transfer coefficient by 28 W/（m2· K）, indicating obvious improvement of heattransfer effect at water side of the condensers.
出处
《动力工程学报》
CAS
CSCD
北大核心
2016年第7期525-529,550,共6页
Journal of Chinese Society of Power Engineering
关键词
凝汽器
水室
管柬
传热系数
导流板
凸起扣板
condenser
water chamber
tube bundle
heat-transfer coefficient
guiding plate
convex buckle
