Heat exchanger in the petroleum, chemical, light industry, pharmaceutical, energy and other industrial production, often used as a cryogenic fluid heat or high temperature fluid cooling, the liquid into steam or steam condensate into liquid. Heat exchanger is a unit of equipment, such as heater, cooler and condenser; but also a part of the process equipment, such as ammonia synthesis tower heat exchanger. Heat exchanger is an important unit in chemical production equipment, according to statistics, the tonnage of the heat exchanger accounts for about 20% of the entire process equipment and some even up to 30%, its importance can be thought