The plate heat exchanger is formed by a plurality of stamped corrugated sheets at regular intervals, surrounded by gaskets, and pressed by a frame and a compression screw. The four corner holes of the plates and the gasket form a fluid distribution pipe and collected tubes. The hot and cold fluids are reasonably separated, so that they flow in the flow channels on both sides of each sheet and exchange heat through the sheets. What are the limitations of the plate heat exchangers in application?
(1) Working pressure below 2.5MPa
The plate heat exchanger is sealed by gaskets, the perimeter of the seal is very long, and the support of the two seals of the corner hole is poor, and the gasket does not get enough pressing force, so the current plate heat exchanger has the highest working pressure 2.5MPa.When the single-plate area is above 1㎡, the working pressure is often lower than 2.5MPa.
(2) It is not suitable for heat exchange of medium that is easy to block the passage
The plate-to-plate heat exchanger has a narrow channel between the plates( generally 3 to 5 mm). When the heat exchange medium contains large solid particles or fibrous substances, it is easy to block the passage between the plates. For this type of heat transfer, consider installing a filter at the inlet or using a regenerative cooling system.
(3) Working temperature below 250 ° C
The operating temperature of a plate heat exchanger is determined by the temperature that the gasket can withstand. When using rubber-type elastic gaskets, the maximum working temperature is below 200 °C; when using compressed asbestos velvet gaskets (Caf), the maximum working temperature is 250~260 °C.