板式省煤器通道结构对换热特性的影响

Effect of Channel Structure for Board Economizer on Heat Transfer Characteristics

摘要:

通过软件Fluent数值模拟与试验验证,研究全焊式板式省煤器在不同结构参数和烟气流速情况下的传热特性.结果表明,当换热器椭圆水流道长轴为30 mm,循环水流道的短长轴比为0.6,板间烟气流道间距控制在15 mm,且烟气流速控制在8 m?s-1时，全焊式板式省煤器的综合换热系数达到50 W?(m2?K)-1.

关键词:板式省煤器; 传热特性; 数值模拟; 试验

Abstract:

The heat transfer characteristics of allwelded plate economizer in different structure parameters and flue gas velocities were numerically simulated using Fluent and experimentally verified. The results show that the whole welding type plate heat exchanger whose major axis of the ellipse is 30 mm has the highest heat transfer coefficient, when the ratio of the shortlong shaft is 0.6, the flow path in interboard spacing of flue gas is controlled at 15 mm, and the rate of flue gas flowing is in 8 m?s-1. The highest heat transfer coefficient is about 50 W?(m2?K)-1.

Key words:plate economizer; heat transfer characteristics; numerical simulation; experiment