为了提高板式凝汽器的换热效果，设计了一种椭圆通道板式凝汽器，入口蒸汽进入4个椭圆管束通道，在相变冷凝过程中，体积不断减少，先后进入3个椭圆管束通道、2个椭圆管束通道，随后从单个椭圆管束通道中排出凝结液，简称为4-3-2-1型。通过FLUENT软件在蒸汽流量68.3 m3/h、温度140 ℃，循环冷却水流量为3 487.14 kg/h及温度20 ℃条件下，模拟并分析了短长轴比和板间距对传热性能的影响。结果表明，对于4-3-2-1型椭圆通道板式凝汽器，板束椭圆通道短长轴比为0.6、板间距为10 mm时，其综合传热性能最佳。为了验证新型板式凝汽器通道布置的合理性，对比了4-3-2-1型、4-2-2-2型和4-4-1-1型3种凝汽器的传热性能，当循环冷却水流速在0.08~0.32 m/s范围内，4-3-2-1型板束通道结构传热性能优于其他两种板束结构，更易使水蒸气发生相变凝结。

In order to improve the heat transfer effect of the plate condenser,an elliptic type channel plate condenser was designed.The inlet steam entered four oval tube bundle channels.During the phase change condensation process,the volume decreased continuously,and entered three oval tube bundle channels and two oval tube bundle channels successively,and then the condensate was discharged from a single oval tube bundle channel,which was referred to as 4-3-2-1 type.The Fluent software was used to simulate and analyze the influence of the short-long axial ratio and plate spacing on the heat transfer performance under the conditions of steam flow of 68.3 m3/h,temperature of 140 ℃,circulating cooling water flow rate of 3 487.14 kg/h and temperature of 20 ℃.The results show that the 4-3-2-1 type of elliptic channel plate condenser has the best comprehensive heat transfer performance under the conditions of the shortlong axial ratio of plate and bundle elliptic channel of 0.6 and the plate spacing of 10 mm.In order to verify the rationality of the new plate condenser channel layout,the heat transfer performances of the three types of condensers,such as 4-3-2-1 type,4-2-2-2 type and 4-4-1-1 type,were compared.The heat transfer performance of the 4-3-2-1 type of plate bundle channel structure is better than the other two types of plate bundle structures when the circulating cooling water flow rate is in the range of 0.08 m/s to 0.32 m/s,which is easier to make water vapor phase change condensation.

TK172