The working principle of refrigeration is that the compressor compresses the steam with lower pressure into the steam with higher pressure, so as to reduce the volume of steam and increase the pressure. Compressor suction from the evaporator working medium low pressure steam, after pressure into the condenser, cold high pressure of the liquid condensed in the condenser, the throttle valve throttle, become low pressure liquid, into the evaporator, the evaporator of heat to evaporate and become a low pressure steam, and then into the entrance of the compressor, thereby complete refrigeration cycle.
Evaporator is one of the most important parts of refrigeration. Through evaporator, the condensing gas at low temperature can exchange heat with the outside air, so as to liquefy and absorb heat and achieve the cooling effect.
The evaporator consists of a heating chamber and an evaporating chamber. The heating chamber provides the heat required for evaporation of the liquid, and causes the liquid to boil and vaporize. The vaporization chamber separates the two phases completely. The steam produced in the heating chamber contains a large number of liquid droplets, which can be separated from the steam by means of condensation or defoaming apparatus. Usually the defoamer is located at the top of the evaporation chamber.
Evaporator according to operating pressure, pressure and pressure relief three. According to the solution in the evaporator in the state of movement: heat circulation type. The boiling solution passes through the heating surface several times in the heating chamber, such as central circulating pipe, hanging basket, external heating, lewin and forced circulation. Affairs one-way. The boiling solution passes through the heating surface at one time in the heating chamber and does not circulate. In other words, the concentrated solution is discharged, such as ascending membrane type, descending membrane type, stirring membrane type and centrifugal membrane type. Press forward contact type. The heating medium is in direct contact with the solution for heat transfer, such as a submerged combustion evaporator. In the operation of the evaporator, a large amount of heated steam will be consumed. In order to save the heated steam, the multi-effect evaporator and the steam recompression evaporator can be adopted. Five-ring cooling shell and tube evaporator is widely used in chemical, light industry, petroleum and other departments.
Post time: Jun-26-2018