Because of the special function of the corrugated surface of plate heat exchanger, the flow of fluid along narrow and curved passages is constantly changing in the direction of its velocity, resulting in strong end-movement of fluid at a small flow rate (Rc=200), thus accelerating the destruction of the fluid boundary layer, strengthening the heat transfer process, effectively improving the heat transfer capacity, and making it compact and gold-structured. It has the outstanding advantages of low consumption, flexible operation, low heat loss, convenient installation, inspection, disassembly and washing, strong corrosion resistance and long service life.
The process of plate heat exchanger is composed of many plates assembled according to certain process and requirement of technical work. A plate and B plate are arranged alternately during assembling. Four corner-hole distribution tubes and confluence tubes are formed in the network channel between plates. The sealing gasket seals the cold and hot media in the heat exchanger, and at the same time separates the cold and hot media reasonably without mixing. In the channel, the cold and hot fluids flow separately, and the countercurrent fluids flow downstream. In the process of flow, the cold and hot fluids exchange heat through the plate wall.
There are many process combinations of plate heat exchangers, which are realized by using different reversing plates and different assemblies. The process combinations can be divided into single process, multi-process, vapor-liquid exchange process and mixed process. The process combination of heat exchanger should be selected according to the process conditions.