How to solve the problem of oil leakage in refrigeration chiller
Dec 06, 2024
- When the oil level in the oil separator is found to be decreasing, immediately adjust the unit to manual control mode and limit the compressor load, such as limiting its energy to 50%.
- Increase the condensing pressure.
- Reduce the low-pressure alarm value and low-pressure shutdown value of the unit to the allowable range, and try to ensure that the unit can be in operation.
- If the oil level is still very low at this time, and the pressure in the evaporator is also very low, it is necessary to consider whether the oil has run into the evaporator. Check the evaporator sight glass to see if there is a lot of white foam churning. If so, it means that the oil is in the evaporator, otherwise it may be in the condenser.
- With the above steps, after about half an hour, the cooling water temperature and exhaust temperature should rise to normal, and the oil collection will begin below:
A: The oil is in the evaporator. At this time, pay close attention to the temperature of the chilled water. You can first appropriately reduce its flow rate to reduce the outlet water temperature, and then quickly increase the flow rate to quickly increase the outlet water temperature of the evaporator. At this time, the water temperature will exceed the saturation temperature of the refrigerant by a lot, and then the refrigerant will boil violently. The refrigeration oil will be sucked into the compressor along with the surging refrigerant foam. At this time, the exhaust temperature should drop a little, but it should also exceed the separation temperature of the oil and the refrigerant, and then bring the oil back to the oil separator and separate them. Repeat several times, and the oil will be completely recovered in the oil separator. Here, pay attention to the time interval for each adjustment of the water volume. It is best to make the exhaust temperature rise to the most accurate level before adjustment after each adjustment.
B: The oil is in the condenser. At this time, you don’t need to pay too much attention to the water temperature. As long as the unit can operate normally, there will be no big problems. At this time, the expansion valve should be gradually opened to the maximum (the opening process should not be too fast to prevent the supply of too much liquid from damaging the copper tube in the evaporator), wait for a few minutes until the high and low pressures of the unit are balanced. At this time, a large amount of white foam can be seen in the sight glass of the evaporator, which means that the oil has entered the evaporator from the condenser. Just repeat step A and the oil will be recovered quickly.
