径向热管换热器壳程压降数值模拟及参数优化

通过对径向热管换热器壳程压力场的数值模拟,分析入口烟气速度对换热器压降的影响规律,并对换热器结构参数进行优化。结果表明:换热器迎风侧压力高于背风侧压力,沿烟气流动方向压力逐渐降低且呈线性分布;换热器压降随入口烟气速度的增加而增加,且其增加速率也相应增大。通过改变换热器结构参数,对换热器壳程压降进行分析研究,得到其结构优化参数:翅片高度小于26.5mm,翅片间距大于6.5mm,热管横向间距108～111mm,纵向间距120～125mm。

Numerical simulation of pressure drop and parameters optimization in shell side of radial heat pipe heat exchanger

The characteristics of the pressure drop was analyzed under different inlet velocities of flue gas and the structural parameters were optimized by simulating the pressure field of shell side of radial heat pipe heat exchanger.The results show that:the pressure on windward side is higher than that of leeward side,and it falls gradually along the flow direction in linear distribution;the pressure drop in heat exchanger increases and the rise of pressure drop accelerates accordingly with the rise of the inlet velocity.The pressure drop in shell side of heat exchanger was studied by changing the structural parameters,and then the optimum structural parameters were obtained:the fin height is less than 26.5mm,the fin space is more than 6.5mm,the transverse space of heat pipes is from 108 to 111mm and the longitudinal space is from 120 to 125mm.