The plate heat exchanger is composed of a set of metal plates, and there are four corner holes on the plate for cold and hot media to pass through. Although the plate heat exchanger is a high-efficiency, energy-saving and inexpensive heat exchange equipment, it has certain advantages in itself, but there are certain limitations in use. What are the limitations of using the plate heat exchanger?
(1) Working pressure is below 2.5MPa
Plate heat exchangers are sealed by gaskets. The perimeter of the seal is very long, and the two seals at the corner holes are poorly supported. The gasket cannot get enough pressing force, so the maximum working pressure of the plate heat exchanger is only 2.5MPa. When the veneer area is more than 1㎡, its working pressure is often lower than 2.5MPa.
(2) It is not suitable for the heat exchange of the medium that easily blocks the passage
The channel between the plates of the plate heat exchanger is very narrow, generally 3 ~ 5mm. When the heat exchange medium contains large solid particles or fibrous substances, it is easy to block the channel between the plates. In such heat exchange occasions, it should be considered to install a filtering device at the inlet or adopt a regenerative cooling system.
(3) Working temperature is below 250 ℃
The operating temperature of the plate heat exchanger depends on the temperature that the gasket can withstand. When using rubber-based elastic gaskets, the maximum operating temperature is below 200 ° C. When using compressed asbestos gasket (Caf), the maximum working temperature is 250 ~ 260 ℃.