空冷凝汽器单元换热面积优化数值模拟研究

Numerical Simulation Research on the Heat Exchange Area Optimization of Air Cooled Condenser Unit

直接空冷凝汽器采用空气作为冷却介质,其运行状况直接影响整个机组的安全经济运行,改善空冷凝汽器的换热效果能有效地为节能减排做出贡献。以某600MW直接空冷凝汽器空冷单元的传统结构为研究对象,创新性地在空冷单元三角形侧面加装散热器,用以增加散热器的换热面积。从三角形散热器的布置方式、散热器厚度、孔隙率3个方面模拟分析了加装三角形散热器对空冷单元换热效果的影响,得到了最佳的布置方案,并通过凝汽器背压进行验证。新方案改善了空冷单元的传热特性,为空冷单元的结构优化设计提供了一定的理论参考。

The direct air cooling condenser adopting air as cooling medium, can directly affect the safety and economic operation of the whole unit, improve the heat transfer effect of the air cooling condenser can effectively contribute to the energy, saving and emission reduction. In this paper, the traditional structure of the air cooling unit of a 600MW direct air cooling unit is studied, the heat sink is arranged on the triangular side of the air cooling unit to increase the heat exchange area of the heat sink. Simulation analysis the inpact of the arrangement mode, thickness, and the fin porosityof the triangular radiator on the heat transfer effect of air cooling unit. The best arrangement for the heat transfer effect is obtained, the heat transfer characteristics of the air cooling unit is improved, a theoretical reference for the optimization design of the air cooling unit is provided.