圆形截面凝汽器布管设计及换热性能分析OA

The vapor condenser is one of the important equipment in the steam power generation system,and its heat exchange performance directly affects the operational efficiency of the entire system.The demand for more efficient condensers in multiple fields is constantly emerging,and the research on the innovative structural design and the optimization of heat transfer performance of condensers is of great significance.The heat transfer model,distributed mass sink and resistance model were compiled into the FLUENT software equipped with porous medium model through user defined functions.The heat transfer performance of a new type of circular cross-section condenser tube layout was analyzed.The results showed that,compared to the change of cooling water conditions inside the tube,the change of thermal resistance outside referring to steam flow rate has a greater impact on the overall average heat transfer coefficient.According to the actual operating condition parameter range,the inlet vapor flow rate is 30～70 m/s,the cooling water flow rate is 0.72～2.15 m/s,the cooling water temperature is 25～28℃,the maximum average heat transfer coefficient is up to 3 562 W/(m2·K),and the pressure drop range is 211～525 kPa.The structural design exhibits higher heat transfer performance and lower pressure drop,while the accumulation of local non-condensable gas indicates that there is still room for further improvement in the structure design.