大型相变热交换器壳程蒸汽流动数值模拟

在大型相变热交换器壳程添加纵向导流板结构,采用Fluent软件对壳程蒸汽流动进行数值模拟计算,分析研究纵向导流板尺寸对热交换器壳程流场分布、阻力性能、传热性能及综合性能的影响规律。数值模拟结果表明,因纵向导流板使蒸汽纵向冲刷管束,充分利用整个管束区进行热交换,故热交换器壳程蒸汽流场分布及换热效果较无导流板更好。采用纵向导流板结构可显著降低热交换器壳程压降、明显提高热交换器传热系数,使热交换器的综合性能得到有效提高。

Numerical Simulation of Shell Side Water Vapor Flow in Large-scale Phase Heat Exchanger

The longitudinal baffle structure was designed on the shell side of a large phase change heat exchanger and Fluent software was used to conduct numerical simulation calculation on the steam flow in the shell side,the influence rule of the longitudinal guide plate size on the flow field distribution,resistance performance,heat transfer performance and comprehensive performance of the shell side heat exchanger was studied. The numerical simulation results show that by the effect of the longitudinal baffles,the steam flushed the tube bundle in the longitudinal direction and the entire tube bundle area is fully utilized for heat exchanging. The distribution and heat transfer effect of the shell-side steam flow field is better than that without the baffles. After adopting the longitudinal baffle structure,the pressure drop of the shell side of the heat exchanger can be significantly reduced with significant improvement on the heat exchange coefficient and the comprehensive performance of the heat exchanger.