螺旋折流板换热器壳程传热和压降的实验研究

摘要

Shell-side flow resistance and heat transfer in a helix baffle heat exchanger have been experimentally studied and compared with the results for conventional baffle heat exchangers. The results show that if the spiral angle is too small (less than 15°) , the shell-side pressure drop is larger than that in conventional baffle heat exchangers. Increasing the spiral angle above 15° decreases the shell-side heat transfer coefficient. Taking into account both the pressure drop and the heat transfer coefficient, the spiral angle should not be too large or too small which is why the spiral angle is in the range 6°- 12° in the engineering design of almost all helix baffle heat exchangers.%实验研究了螺旋折流板换热器的传热性能和壳程压力降,并与传统的弓形折流板换热器进行比较.结果发现如果螺旋折流板螺旋角过小(小于15°),螺旋折流板换热器壳程压力降可能会超过普通弓形折流板换热器；螺旋角增大(大于15°),螺旋折流板换热器壳程传热系数会下降.综合考虑螺旋折流板换热器的壳程压力降和壳程传热系数,螺旋折流板螺旋角不能过大,也不能过小,所以在工程设计中,螺旋角一般应取在6°～12°之间.