Brief introduction of plate heat exchanger plate heat exchanger is a kind of heat exchanger which is made of thin metal plate (generally stainless steel) pressed into heat exchange plate with certain shape ripple, and then added with sealing rubber pad and stacked (see Figure 1). It is mainly composed of plate, sealant pad, clamping bolt, compression plate, whole machine frame and other parts. The cold and hot medium flows through the respective channels through the adjacent heat exchange plates, and the heat exchange is carried out through a thin heat exchange plate in the middle. Therefore, it has the characteristics of high efficiency and energy saving, high heat exchange coefficient, safe and reliable use, compact structure, small waste volume, less land occupation, flexible combination, convenient adjustment and maintenance, etc.