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First, the harm of water intake of refrigeration unit
1. Ice blockage phenomenon When water enters the refrigeration system and mixes with the refrigerant, it may form ice cubes when passing through the throttle device such as the expansion valve or capillary tube due to the decrease in temperature, causing ice blockage. In this case, the flow of refrigerant is hindered, resulting in poor liquid supply and affecting the normal operation of the entire system.
2. Lubricating oil emulsification water contact with lubricating oil may lead to lubricating oil emulsification, which will greatly reduce the lubrication performance of lubricating oil, and then affect the work efficiency and life of compressors and other moving parts.
3. Corrosion Water can chemically react with refrigerants in the refrigeration system to produce corrosive substances such as hydrochloric acid and hydrogen fluoride, which will cause serious corrosion to metal components, especially key parts such as valves, bearings and shaft seals, shortening the service life of equipment and increasing maintenance costs.
4. Effect on electrical insulation The presence of moisture may also reduce the electrical insulation performance of the refrigerant, which can be fatal for fully enclosed compressors as it may lead to an increased risk of motor burnout.
5. System stability problem Too much water may also lead to abnormal internal pressure of the system, such as the pressure rise on the high pressure side, which not only increases the working load of the compressor, but also may trigger the action of the high pressure protection device, resulting in unit shutdown.
Two, refrigeration system water treatment method reference
After adding a small amount of fluorine to the leakage part of the condenser, use nitrogen to suppress 10Kg, and use soapy water and clean water to check the possible leakage. If it is the leakage part of the evaporator, observe whether there is oil trace in the frozen water, and if there is leakage, there is no leakage. If the added refrigerant contains water, release an appropriate amount of the refrigerant in the bottle into a clean and dry glass container. After the refrigerant has evaporated, observe whether water exists in the container. If so, it indicates that the refrigerant in the bottle has a high water content, and investigate the source.
If the system has more water, the treatment method is referred to: 1, disassemble the refrigeration system components: condenser, evaporator, compressor (remove the oil filter), high-pressure filter dryer, expansion valve, solenoid valve, stop valve, liquid storage tank, connection pipe, etc., can be disintegrated (large parts do not necessarily need to be shifted), easy to carry out the next step.
2. Stage blowing: blow out all the water in the parts as much as possible with the method of instant release after nitrogen pressure. If the refrigerant system pipeline is complex, according to the specific situation, the water can be blown out in sections after burning the pipeline with a welding torch in some parts
3, restore the refrigeration system: After the whole unit is restored, open all the channels in the refrigeration system (the spool of the expansion valve, the high pressure drying filter, the solenoid valve spool is temporarily not installed, the oil filter and the frozen oil in the compressor are temporarily not added), and vacuum for a relatively long time (the best parts can be heated, and the compressor can be connected to the oil heater, in order to speed up the evaporation of the remaining water in the system).
4, boot operation: confirm that the water in the system is basically eliminated, and then restore the refrigeration system, load the clean oil filter, high pressure drying filter element, add the frozen oil, according to the normal assembly of the unit.
If the water in the refrigeration system is not very serious, then there is no need to disassemble the refrigeration components, and change the filter.
1, Replace the filter: first replace the unit system high-pressure dryer filter, if it is a dry filter bucket, can be clean and dry degreasing gauze to make pockets after modification of live "alumina particles" and the amount of discolored silica gel (easy to observe the water content), replace the compressor with the original water content of the frozen oil.
2, replace the filter again: After running for a period of time, replace the filter dryer again, pay attention to observe the discolored silica gel to determine the degree of water content of the system, and run repeatedly according to this operation sequence.
3, boot operation: confirm that the water in the system is basically eliminated, replace the clean oil filter, high pressure drying filter element, frozen oil, etc., according to the normal assembly of the unit.
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