Heat exchanger (also known as heat exchanger or heat exchange equipment) is used to make heat transfer from hot fluid to cold fluid, in order to meet the requirements of the specified process of the device equipment, is an industrial application of convection heat transfer and heat conduction.

Heat exchangers can be classified in different ways. According to its operation process can be divided into wall type, mixed type, regenerative type (or called regenerative type) three categories. Heat exchanger plays an important role in chemical, petroleum, power, food and many other industrial production. In chemical production, heat exchanger can be used as heater, cooler, condenser, evaporator and reboiler, etc., widely used. It mainly focuses on petroleum, chemical industry, metallurgy, electric power, shipbuilding, central heating, refrigeration and air conditioning, machinery, food, pharmaceutical and other fields.