What is the principle of lithium bromide water cooling in the ammonia synthesis system?

A lithium bromide absorption chiller uses a lithium bromide solution as the absorbent and water as the refrigerant; it achieves cooling by utilizing the heat absorption that occurs when water evaporates under high vacuum. 　　To enable the refrigeration process to continue continuously, the evaporated refrigerant vapor is absorbed by the lithium bromide solution, causing the solution to become dilute; this process takes place in the absorber. Then, using thermal energy, the solution is heated to separate out the water, thereby concentrating the solution – this process occurs in the generator. The steam produced in the generator condenses into water in the condenser, and after throttling, it is sent to the evaporator to evaporate. This cycle is repeated to achieve continuous cooling. 　A lithium bromide absorption chiller is mainly composed of four components: an absorber, a generator, a condenser, and an evaporator. Ordinary water cooling involves heat transfer through a partition, with the heat from the water being reduced in a cooling tower system

　A lithium bromide absorption chiller uses a lithium bromide solution as the absorbent and water as the refrigerant; it achieves cooling by utilizing the heat absorption that occurs when water evaporates under high vacuum. 　　To enable the refrigeration process to continue continuously, the evaporated refrigerant vapor is absorbed by the lithium bromide solution, causing the solution to become dilute; this process takes place in the absorber. Then, using thermal energy, the solution is heated to separate out the water, thereby concentrating the solution – this process occurs in the generator. The steam produced in the generator condenses into water in the condenser, and after throttling, it is sent to the evaporator to evaporate. This cycle is repeated to achieve continuous cooling. 　　It can be seen that a lithium bromide absorption chiller is mainly composed of four components: the absorber, the generator, the condenser, and the evaporator. The dilute lithium bromide solution that comes out of the absorber is pumped, using a solution pump (i.e., the generator pump), to an elevated pressure. It then passes through a solution heat exchanger, where its temperature is increased by the high-temperature concentrated solution coming out of the generator, before entering the generator. In the generator, the solution is heated by steam from the heat source inside the heat transfer tubes; its temperature rises until it boils. The water in the solution gradually evaporates, resulting in an increasing concentration of the solution. 　　The refrigerant vapor that evaporates in the generator rises upward and enters the condenser through the liquid baffle. The liquid baffle serves to separate vapor from liquid, preventing liquid droplets from entering the condenser along with the vapor. Cooling water is passed through the heat transfer tubes of the condenser; as a result, the refrigerant vapor outside the tubes is cooled by the cooling water and condensed into water, which is then the refrigerant water. 　　The refrigerant water accumulated at the bottom of the condenser flows into the evaporator after throttling, as the pressure in the condenser is higher than that in the evaporator. For example: when the condenser temperature is 45°C, the condensation pressure is 9580 Pa (71.9 mmHg) ； At an evaporation temperature of 5°C, the evaporation pressure is 872 Pa (6.45 mmHg). The U-tube serves as a liquid seal to prevent steam from the condenser from entering the evaporator directly. ? When the refrigerant water enters the evaporator, some of it vaporizes as a result of the reduced pressure. Since the evaporator is a spray-type heat exchanger, the amount of spray is many times greater than that of the evaporating fluid; therefore, most of the refrigerant water accumulates in the water tray of the evaporator. It is then pumped to higher pressure by a refrigerant water pump and sent into the spray nozzles of the evaporator, from where it is sprayed onto the outer surface of the tube bundle. After absorbing the heat from the refrigerant water flowing inside the tubes, it evaporates into low-pressure refrigerant water vapor. Due to the low pressure inside the evaporator, it is possible to obtain low-temperature refrigerant water required for the production process or air conditioning system, thereby achieving cooling effects. For example, when the evaporator pressure is 872 Pa, the evaporation temperature of the refrigerant water is 5°C; at this point, refrigerant water at 7°C can be obtained. 　　The evaporated refrigerant vapor, after having its entrained liquid droplets separated by a liquid baffle, enters the absorber, where it is absorbed by the intermediate solution pumped by the absorber pump and sprayed evenly over the surface of the absorber tubes, thereby thinning the solution again. The intermediate solution is obtained by mixing the concentrated solution that has cooled down due to heat release from the solution heat exchanger with the dilute solution in the absorber liquid bag. To ensure the continuous progress of the absorption process, the heat released during this process must be promptly removed by the cooling water in the heat transfer tubes. After absorbing a certain amount of water vapor, the intermediate solution becomes a dilute solution; it collects in the liquid reservoir at the bottom of the absorber and is then pumped back to the generator by the generator, in a continuous cycle.

I’ve learned about it now; there are two lithium bromide units in the factory – one is used for cooling gas, and the other is used for the central air conditioning in the office and living areas. I hadn’t studied this before, but now I have some insight!

I’ve learned a lot; thank you for your attention! :victory:

Could the original poster send me the process of using lithium bromide to cool gas? I heard someone say some time ago that they really wanted to learn *; thanks! ! qq:1107872526

The temperature of the refrigerant water after throttling and as it enters the evaporator is around 30 to 40 degrees, while the temperature of the water supplied by the users is around 20 to 30 degrees. Could those with more experience tell me how cold water is produced in the evaporator?