Heat exchanger is part of the thermal fluid heat transfer to cold fluid equipment, also called heat exchanger. Heat exchanger is to realize the heat exchange and transmission in the process of chemical production indispensable equipment. In petroleum, chemical industry, light industry, pharmaceuticals, energy and other industrial production, often used as a low temperature fluid heating or cooling high temperature fluid, the liquid into steam or the steam condensed liquid. Heat exchanger in the main function is to ensure that required by the specific process of medium temperature, is also one of the main equipment of energy efficiency.