Condensers are divided into three types: carbon steel tube condenser, stainless steel tube condenser, and carbon steel and stainless steel mixed tube condenser. They are classified into fixed tube plate type, floating head type, and U-shaped tube heat exchanger according to their forms, and single tube side, double tube side, and multi tube side according to their structures. Stainless steel condenser can be a separate equipment such as heater, cooler, and condenser; It can also be a component of a certain process equipment, such as the heat exchanger in an ammonia synthesis tower. Due to limitations in manufacturing technology and scientific level, early heat exchangers (condensers) could only adopt simple structures, with small heat transfer areas, large volumes, and bulky structures, such as serpentine heat exchangers. With the development of manufacturing technology, a shell and tube heat exchanger has gradually emerged, which not only has a large heat transfer area per unit volume, but also has good heat transfer effect. It has long been a typical heat exchanger in industrial production