Heat exchanger is a kind of energy saving equipment in which two or more fluids with different temperature transfers heat. In the heat exchanger, the fluid with high temperature conducts heat to the fluid with low temperature, which can make the fluid with low temperature reach the parameter of the process and meet the needs of the process conditions. At the same time, it is also one of the main equipment to improve energy efficiency. In production process, heat exchanger can be used as a heater, cooler, condenser, evaporator and reboiler. It is widely used and occupies an important position in the petrochemical industry.