折流板开孔对管壳式换热器性能的影响

传统的弓形折流板换热器因其结构简单、安全可靠及适应性强等优点应用非常广泛,但是传统的弓形折流板换热器换热效率较低,壳程压力损失较大,容易结垢。因此,通过对弓形折流板结构进行改进以改善管壳式换热器的壳程流动传热状况,减小其能耗损失具有十分重大的工程意义。采用数值模拟的方法,对缺口高度为0.2 D的折流板进行开孔优化研究,对不同壳程进口流速下的普通弓形折流板换热器和折流板开孔换热器的壳程流场及温度场分别进行了数值模拟。在壳程进口流速相等的条件下,折流板开孔的换热器比普通弓形折流板换热器的换热效果好;壳程进口速度较低时,效果最明显。

Effect of Baffle Opening on the Performance of Shell-and-T ube Heat Exchanger

The traditional baffle heat exchanger is widely used for its simple structure, safety and reliability and adaptability advantages, but the traditional baffle heat exchanger has many weaknesses ~ its thermal efficiency is low, shell side pressure loss is bigger and easy scaling. It is a very important engineering significance through improving the vertical baffles＂ structure to ameliorate the shell and tube heat exchanger＇s flow and heat transfer condition of shell side and reduce its energy dissipation. Baffle opening to improve the structure of a gap 0.2D height was studied by numerical simulation method. The velocity field and temperature field numerically simulated ordinary baffles heat exchanger and baffle opening heat exchanger. Under the condition of the same entering velocity of shell side, the thermal effect of baffle opening heat exchanger is better than ordinary vertical baffle plate heat exchanger. And when the entering velocity of shell side is slow, the effect is better.