Plate heat exchanger is a kind of heat exchanger made of thin metal plate pressed into a certain corrugated shape, and then arranged and folded according to A and B plates, fastened by movable plate, fixed plate and bolt.In the early days, plate heat exchangers were mostly used in the processing of milk sterilization or beer. It has been widely used in the industry as a compact heat exchange device. Through application practice, people gradually have a deeper understanding of its superiority. With the expansion of application fields and the advancement of manufacturer technology, plate heat exchangers have become an important heat exchange equipment. Heat exchangers can be found in daily life heating, condensers on steam turbines and oil coolers on space rockets . It is also widely used in chemical, chemical, and nuclear industries.