Plate heat exchangers are widely used in many industries such as power engineering, shipping, petroleum, food and light industry. The surface of the plate heat exchanger has a compact structure and small gaps, so the heat transfer area per unit volume is increased, and its installation area is about 1/2 to 1/3 of the shell-and-tube type. Generally, it can save floor space and construction cost. When the volume of each shell is 1m3, its heat transfer area is about 80m2. The plate heat exchanger is easy to increase or decrease the heat exchange area. When the shell and tube heat exchanger needs to increase the processing capacity of the liquid, it is almost impossible to increase the heat transfer area of the original heat exchanger.
The temperature, pressure, and chemical stability that the heat exchanger gasket can withstand often become the temperature and pressure limits of its use and the allowable range of materials. Due to the small gap between the heat transfer surfaces and the unevenness on the heat transfer surface, the pressure loss is greater than that of the traditional smooth. The working pressure of the plate heat exchanger is relatively low. All-welded plate heat exchangers do not use any non-metallic sealing materials. It can have higher temperature resistance and pressure resistance. It is suitable for extreme working conditions with a working temperature of 300°C and a pressure of 3.0Mpa. The working temperature of the detachable plate heat exchanger under normal conditions is less than 150℃ (related to the performance of the sealing material), and its pressure is less than 1.6Mpa.