display cases Distillation principle
display cases Distillation principle Actually, the rectification process of display cases is carried out in a rectification tower. The area where heat and mass exchange occurs below the inlet of the rectification tower is called the stripping section, and the area where heat and mass exchange occurs above the inlet is called the rectification section. The rectification tower also has a generator (also called a reboiler) and a reflux condenser. The former is used to heat the concentrated ammonia solution to produce ammonia and water vapor for further rectification; the latter is used to generate reflux and also provide Used in the distillation process of fine radium. is heated in the generator of the rectification tower, after absorbing heat a, part of the solution evaporates, and the generated vapor passes through the stripping section to obtain w of ammonia vapor (1+R) kg, and then through the rectification section and reflux condenser , To make the rising vapor get further rectification and fractional condensation, increase to w (point 5 ), discharged from the top of the tower, the discharged vapor quality is 1kg. In the reflux condenser, the heat qR released by condensing Rkg reflux liquid is taken away by cooling water. Obtain a dilute solution (f-1) kg at the bottom of the generator, denoted by point 2. The almost pure ammonia vapor discharged from the top of the rectification tower A enters the condenser B and condenses into a liquid under equal pressure and equal mass fraction (point 6), and the heat qk released during condensation is taken away by the cooling water. The liquid ammonia passes through the throttle valve I, the pressure drops from pk to po to form wet vapor (point 7), and then enters the evaporator C. In the evaporator C, the liquid ammonia absorbs the heat qo of the object to be cooled and vaporizes, and then is vaporized by the evaporator C is discharged (point 8). The state at point 8 can be wet steam, saturated steam, or even superheated steam, depending on the temperature required by the object to be cooled.
display cases discharge w'a's dilute solution of w'a from the bottom of the generator a. After passing through the solution heat exchanger E, the temperature drops to the temperature of the point 2a state, because the pressure of the point 2a state is pk, Therefore, the solution is supercooled. The supercooled solution passes through the throttle valve F, the pressure drops from pk to A, the state is represented by point 3, and then enters the absorber D, absorbs 1kg of vapor produced by the evaporator, and forms a concentrated solution of fkg, w (point 4) , The heat qi released during the absorption process is taken away by the cooling water. The concentrated solution at point 4 is boosted by the solution pump G, the pressure is increased from Po to Luk (point 4a), and then heated by the solution heat exchanger E, the temperature is increased to the state point la, and finally from the distillation tower A The feed port 3 enters the rectification tower, and the cycle is repeated. Assuming that the state entering the distillation column is la, and the concentrated solution with a mass fraction of Wir is located below the saturated liquid line pk, that is, in a supercooled state. The above articles are from refrigerated showcase display cooler and display cases. For details, please log in: www.ihdjx.com Free Order Hotline: +86 18019567573 Contact: Mr. Shao 26066250@qq.com
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