Plate heat exchanger is a kind of efficient and compact heat exchange equipment. In the 1880s, the continuous cryogenic sterilizer was successfully developed, which was started to apply to the food industry by the 1920s. The plate heat exchanger in the manufacture and use is of some unique, so, at present, plate heat exchanger has been used in petroleum, chemical industry, light industry, electric power, metallurgy, machinery, energy and other industrial fields. China began to produce plate heat exchangers in the 1960s, and now plate heat exchangers have been used in many fields in China.
In refrigeration technology, heat exchanger is indispensable refrigeration equipment, condenser, evaporator, regenerator, intercooler and other heat exchange equipment.It not only accounts for more than 50% in the weight, volume and metal consumption of the whole refrigeration equipment , but also on the refrigeration performance will have a significant impact. Therefore, strengthening the heat transfer of refrigeration heat exchanger, reducing weight and volume, and reducing metal consumption have been the development direction of refrigeration technology. Now a new type of fully welded plate heat exchanger has appeared and it is used in refrigeration technology, which shows a strong development potential. Compared with shell-side tube heat exchanger for refrigeration, in addition to the general characteristics of plate heat exchanger, plate heat exchanger for refrigeration also has the following characteristics:
The volume of shell side and tube side of shell and tube exchange is very large. In order to make the refrigeration system work properly, a large numberof refrigerants should be filled, whichmay also cause environmental pollution.
On the one hand, the plate heat exchanger is small in size, onthe other hand, the spacing size is also small.
Low freezing tendency and high freezing resistance
Since water at low flow rates can form highly turbulent flow in plate heat exchangers, the temperature distribution is very uniform, thus reducing the freezing tendency of chilled water. Even when frozen, it can withstand the pressure generated by freezing. It can be used after freezing unlike shell-and - tube heat exchanger. Evaporation thoroughly, high economy When the refrigerant evaporates in the refrigerating plate heat exchanger, it is easy to achieve complete evaporation without liquid state. Therefore, in most cases, it is not necessary for the refrigerating system to set up a gas-liquid separator.It is easy to realize the unitary, simple and convenient installation, maintenance and transportation can save costs, reduce costs.