立式热交换器分流板压力场数值模拟与结构优化

Numerical Simulation of Pressure Field and Structural Optimizationof Splitter Plate in Vertical Heat Exchanger

摘要: 针对某工业园区分布式能源系统立式热交换器出口烟温高的问题，因此本文提出在烟气域内增设分流板，改变分流板的高度、夹角、长度，以及对分流板打孔，分析并比较了不同结构的分流板对烟气入口压降的影响，以及不同分流板结构对烟气入口压降的优化效果。得出结果如下：分流板开口位置每向上移动50 mm，入口压降减小，减小幅度为12.7%~8.6%，并呈递减趋势。分流板开口位置每向下移动50 mm，入口压降增大，增大幅度为19.5%~21.4%，并呈上升趋势。当分流板夹角缩小时入口处压降会明显降低，夹角缩小为90˚分流板入口压降变化幅度为58.1%。在分流板上打孔有助于释放压力，但不适合增加分流板直板的长度。

Abstract: Aiming at the problem of high flue gas temperature at the outlet of the vertical heat exchanger of the distributed energy system in an industrial park, this paper proposes to add a splitter plate in the flue gas domain, change the height, angle and length of the splitter plate, and punch the splitter plate to achieve the effect of heat transfer enhancement. The influence of different splitter plates on the pressure drop at the flue gas inlet and the optimization effect of different splitter plate struc-tures on the pressure drop at the flue gas inlet are analyzed and compared. The results are as fol-lows: for every 50 mm upward movement of the opening position of the splitter plate, the inlet pressure drop decreases by 12.7%~8.6%, and shows a decreasing trend. When the opening posi-tion of the splitter plate moves downward by 50 mm, the inlet pressure drop increases by 19.5%~21.4% and shows an upward trend. When the angle of the splitter plate is reduced, the pressure drop at the inlet will be significantly reduced. When the angle is reduced to 90˚, the pres-sure drop at the inlet of the splitter plate changes by 58.1%. The hole channel on the splitter plate helps to release pressure, but is not suitable for increasing the windward area of the splitter plate.