Bromine cooler is a closed high vacuum environment, and the refrigerant-lithium bromide solution is concentrated, absorbed and diluted in the inner cavity, thus achieving the refrigeration effect. Therefore, the cleanliness of the inner cavity is related to the quality and performance of the refrigerant-lithium bromide solution, thus affecting the refrigeration effect. The lithium bromide solution used in bromine cooler is expensive, and its quality meets the requirements of reagent level. Unqualified solution not only leads to the attenuation of refrigeration capacity, but also shortens the service life of the unit. The inner cavity containing impurities and dirt will block the filter screen of shielded pump and cause failure. Will block the absorber, evaporator nozzle or shower hole, resulting in the reduction of absorption and evaporation efficiency and the attenuation of refrigeration capacity; Fouling will be formed in the high-pressure generator, evaporator, absorber, condenser tube side and shell side of high-low temperature heat exchanger, which will affect the heat exchange effect. Therefore, keeping the solution cavity of bromine cooler clean and the nozzle unblocked is also an important part of the maintenance of bromine cooler.When the unit runs for a long time, impurities such as rust are inevitably produced in the inner cavity, the quality of the solution is reduced, the inner cavity is seriously corroded, and a large amount of dirt is accumulated in the shell side of the heat exchanger, which affects the heat exchange effect. When the spray nozzle or spray hole of absorber and evaporator is blocked, the inner cavity must be cleaned.Due to the corrosiveness of lithium bromide solution to metal materials and the use of octanol as an energy enhancer, the inner cavity of the bromine cooler will rust and produce slime after being used for a period of time. For example, a layer of dirt will be formed on the tubes and shells of high and low temperature heat exchangers, generators, absorbers and evaporators, and its main components are Fe2O3, CuO and organic carbonized materials. These dirt are usually firmly stored, and it is no longer found by solution cleaning. In order to ensure thorough descaling, it is often necessary to keep a certain cleaning temperature by heating. When there is a large piece of rust slag in the inner cavity, accompanied by the blockage of absorber, evaporator nozzle or spray hole, chemical cleaning such as rust removal and nozzle dredging should also be carried out.Because of the complicated process and the diversity of internal materials of bromine cooler. Therefore, chemical cleaning should first master the internal structure and working flow of bromine cooler, fully consider the safety of equipment when selecting chemicals, avoid shortcuts when operating, fully mix the chemicals evenly, and strictly test relevant data. Practice has proved that after scientific chemical cleaning of the inner cavity, the refrigeration capacity of the unit will be restored to above 90% under other normal conditions. And the refrigerating capacity will not be attenuated again due to inner cavity pollution or nozzle blockage in a long time.It should be noted that for chemical cleaning of the inner cavity, the solution remaining in the machine will be lost due to water cleaning, so it should be taken out as much as possible. Before cleaning, the water should be flushed until there is no Br-, and the next operation can be carried out. After cleaning, processes such as passivation and prefilming should be carried out to prevent the clean metal from corroding again. (The above content comes from the network)