A heat exchanger is a equipment that transfers part of the hot fluid heat to a cold fluid, also known as a heat exchanger. Heat exchangers are indispensable equipment for heat exchange and transfer in chemical production processes. The detachable plate heat exchanger is a highly efficient and energy-saving heat exchanger with many advantages such as high heat transfer efficiency, light weight, small footprint and easy maintenance. It can be made of non-metallic materials such as graphite, ceramics, glass, and metal materials such as stainless steel, titanium, tantalum, and zirconium. However, heat exchanger materials made of graphite, ceramics, glass are fragile, bulky, and poorly thermally conductive. Heat exchangers made of rare metals such as titanium, tantalum, and zirconium are too expensive, and stainless steel is difficult to withstand many corrosive media. Intergranular corrosion.