display cases Distillation principle (two)
display cases Distillation principle In display cases, the refrigerant solution passes through the stripping section to the generator, and exchanges heat and mass with the ammonia vapor generated in the generator along the way. The first is eliminated. Cold, so that the concentrated solution reaches saturation 1, and then is heated in the generator. As the temperature increases, the solution evaporates continuously under equal pressure conditions, gradually becomes thinner, and becomes work w when it leaves the bottom of the distillation tower. , The temperature is Z, represented by point 2. The vapor state at the beginning of the occurrence and the vapor state at the end of the occurrence are represented by points 1 and 2 respectively, and their mass fractions are respectively s and a. The boiling state of the solution phase is in equilibrium. Therefore, the state of the vapor leaving the generator should be between 1 and 2, assuming state 3, with a mass fraction of WNcm. When passing through the stripping section, it exchanges heat and mass with the concentrated solution of W. Ideally, the mass fraction of ammonia leaving the stripping section should correspond to the equilibrium vapor 1n of the concentrated solution w at the feed inlet, which is increased by w When it reaches Wd, it passes through the rectification section and reflux condenser to exchange heat and mass with the reflux liquid condensed from the reflux condenser. The mass fraction of ammonia is further increased and the temperature is lowered. When it leaves the top of the tower, it is WRa. Use point 5 , Said. In the reflux process, the ammonia mass fraction gradually decreases. Ideally, when it leaves the bottom tray of the rectification tower, it should be the same as the W at the feed port. In the display cases, the saturated ammonia vapor with the mass fraction of W leaves the top of the tower and enters the condenser, where it is condensed into a saturated liquid under the condition of equal pressure and equal mass fraction, indicated by point 6. The condensed liquid can also reach the supercooled state under the condensing pressure pk, depending on the temperature of the cooling water and the structure of the condenser, and then pass through the throttle adiabatic throttling to state 7, due to the specific melting before and after throttling The value and the mass fraction have not changed, so points 6 and 7 are coincident, but as pointed out in the above, the states represented by the two points are not the same. Point 6 represents the saturated liquid under the condensation pressure P, Point 7 represents the wet vapor at the evaporation pressure Po, which is composed of saturated liquid (point 7') and saturated vapor (point 7 ). The degree of throttling is x=77'/77 , and the temperature is determined by trial and error, that is, first assume a certain temperature t7 (point 7') on the saturated vapor pressure F liquid line, and find it through the auxiliary pressure line The saturated vapor state point 7 under the corresponding pressure, even 7' 7 , if the line just passes through point 7, the assumed temperature t1 is the temperature after throttling, otherwise, re-assume t7 until 717 passes point 7. The throttling wet vapor enters the evaporator and evaporates to state point 8 under equal pressure and equal mass fraction. Point 8 is generally still in a wet vapor state, consisting of saturated liquid at point 8' and saturated vapor at point 8. Its temperature is also calculated by trial and error. The state drawn by the generator isThe dilute solution at point 2 passes through the solution heat exchanger and is cooled to the supercooled state 2a under pk pressure, assuming 2a (just on the saturated liquid line of the evaporation pressure w), and then throttling to state 3 by the throttle valve , And then enter the absorber. Similarly, the state points 2a and 3 before and after the throttling are overlapped on the large print, but they represent different states. The above articles are from refrigerated showcase commercial refrigeration 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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