The plate heat exchanger is composed of plates, sealing gaskets, fixed compression plates, movable compression plates, compression studs, nuts, upper and lower guide rods, and front pillars. The plate changer has the advantages of high heat transfer efficiency, small footprint, small heat loss, simple structure, easy handling and installation, and easy disassembly and assembly. Compared with shell-and-tube heat exchangers, plate heat exchangers have higher requirements for the cleanliness of the medium, which requires the diameter of impurity particles in the medium to be less than 1.5-2mm. On the other hand, the early plate and frame heat exchangers can only be applied to working conditions where the working pressure is less than 1.6MPa and the working temperature is between 120 and 165°C.
Brazed plate heat exchangers or laser fully welded plate heat exchangers have a high equipment purchase cost (about 3 to 5 times the price of detachable plate heat exchangers). It is not removable and not easy to maintain. The heat source of the heat exchange station is 1.1MPa (230℃) superheated steam, which is limited by the temperature resistance of the sealing gasket. Common EPDM gaskets can withstand temperature of 150℃, high temperature EPDM gaskets can withstand temperature of 180℃, and high temperature resistant PTFE The temperature resistance of the gasket is only 220 ℃, and the price is expensive, which is about 8 times that of the high temperature resistant EPDM gasket, so the traditional detachable plate heat exchanger is not suitable for this working condition.