Supermarket refrigerated showcase distillation principle (3)
supermarket refrigerated showcase distillation principle supermarket refrigerated showcase If the refrigerant is in the absorber, if the pressure loss between the evaporator and the absorber is neglected, the absorption process is carried out under the Po equal pressure condition, and the saturated dilute solution of state 3 absorbs the vapor from the evaporator (point 8) It gradually thickens along the isobar and reaches w at the end of absorption, which is represented by point 4. After the concentrated solution in point 4 passes through the solution pump, the pressure increases from a to pk, which is represented by point 4a. If the temperature change caused by the work of the solution pump on the concentrated solution is ignored, point 4 and point 4a coincide, and point 4a represents pk The supercooled liquid under pressure, the supercooled liquid passes through the solution heat exchangeIn the converter, the temperature rises, indicated by the state point la, and finally enters the feed port of the rectification tower, and the cycle restarts. It should be emphasized that no matter in the condensation process or the evaporation process, the temperature of the solution is not a constant value even though the phase change occurs under constant pressure. It can be seen that during the condensation process, the temperature of the solution decreases from Z5 to t6; during the evaporation process, the temperature of the solution rises from Z7 to t8, which is the same as when the single component working fluid undergoes a phase change under equal pressure. not the same. Because when the pressure is constant, as the condensation or evaporation process proceeds, the mass fraction of the solution is constantly changing. During the condensation process, there are more and more low-boiling point components (ammonia) in the solution, so the saturation temperature becomes lower and lower; on the contrary, during the evaporation process, the low-boiling point components in the solution become less and less, and the saturation temperature gradually increases. The higher the dryness of the wet vapor when it leaves the evaporator, the higher the final evaporation temperature.high. Therefore, the temperature of the cooled medium can be met by controlling the dryness of the wet steam. The installation of a solution heat exchanger in the system can significantly improve the economy of the entire device. Heat exchange through the solution can increase the temperature of the concentrated solution entering the generator and reduce the consumption of heating steam in the generator. On the other hand, it can Reduce the temperature of the dilute solution entering the absorber, thereby reducing the consumption of cooling water in the absorber and enhancing the absorption effect of the solution. The temperature change of the solution in the heat exchanger is related to the heat transfer surface area of the heat exchanger. The temperature change of the dilute solution of will be greater than the temperature change of the concentrated solution, because the flow rate (f-1)kg of the dilute solution is less than the flow rate fkg of the concentrated solution, and their specific heat capacities are not much different. The ammonia absorption refrigeration system is sometimes also equipped with a gas-liquid heat exchanger, and the low-temperature wet vapor from the evaporatorIt exchanges heat with the liquid from the cooling condenser in the counter-flow heat exchanger, so that the condensed liquid is supercooled, thereby increasing the cooling capacity of the device, but the enthalpy of ammonia entering the absorber increases, causing the heat load of the absorber Increase. Whether to use this kind of heat exchanger in practice depends on factors such as the amount of heat saved in the generator, the increase in cooling water consumption in the absorber, and the cost of the heat exchanger itself. Since the heat transfer efficiency on the steam side is very low, especially at low evaporation pressures, in order to achieve a certain amount of heat exchange, the heat exchange area must be large enough, so the cost is increased, and the gain is often outweighed. The lowest temperature that the system can produce is related to the heating source temperature and the cooling water temperature. Generally, it is not lower than -25°C, otherwise the air release range (wir-wla) will be less than 0.06, which will reduce the economy of the device. If the temperature of the heat source is lower, the temperature of the cooling water is higher, and when a lower temperature is required, The supermarket refrigerated showcase can adopt two-stage ammonia absorption refrigerator or single-stage ammonia absorption refrigerator with ejector. The above articles are from refrigerated showcase supermarket refrigerated showcase and supermarket refrigerated showcase. For details, please log in: www.ihdjx.com Free Order Hotline: +86 18019567573 Contact: Mr. Shao 26066250@qq.com
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