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The refrigeration system in the cold storage room is a system that uses external energy to transfer heat from a material (or environment) with a lower temperature to a material (or environment) with a higher temperature. In the actual operation process, we often encounter various emergencies. At this time, we need to be in danger and make correct and effective treatment measures through our own experience to prevent unnecessary losses.
In the normal operation of the cold storage room refrigeration system, if there is a sudden power failure, the liquid supply valve in the system should be closed immediately and the liquid supply to the evaporator should be stopped immediately to avoid "liquid strike" failure when the compressor is restarted when the power supply is restored. . Then close the suction and discharge valves of the compressor quickly.
After the cold storage room refrigeration system restores power, you can first keep the liquid supply valve closed and start the compressor according to the normal procedure. When the evaporating pressure drops to a certain value (slightly lower than the evaporating pressure under normal operating conditions), you can open the supply again. The liquid valve restores the normal operation of the refrigeration system of the small cold storage room.
When the refrigeration system of small and medium-sized cold storage room is in normal operation, if the cooling water supply is suddenly interrupted due to some reason, the power supply of the compressor motor should be cut off first, and the operation of the compressor should be stopped. In order to avoid the failure of cooling the refrigerant vapor in the high temperature and high pressure state, causing the system pipes or valves to burst accidents. Then close the liquid supply valve, the suction and exhaust valves of the compressor, and then shut down various equipment according to the normal shutdown procedure.
After the supply of cooling water in the refrigeration system of small and medium-sized cold storage room is restored, you can first keep the liquid supply valve closed, start the compressor according to the normal procedure, and wait for the evaporation pressure to drop to a certain value (slightly lower than the evaporation pressure under normal operating conditions) , The liquid supply valve can be opened again to restore the normal operation of the cold storage room refrigeration system. However, if the safety valve on the condenser of the refrigeration system has been activated due to the water cut, before the operation of the refrigeration system of the cold storage room is restored, the safety valve must be pressure-tested once to ensure that its sensitivity is not damaged.
In the normal operation of the refrigeration system of the small and medium-sized cold storage room, if a fire in the refrigeration room or adjacent building endangers the safety of the system, the power should be cut off first, and the system should be stopped according to the emergency measures of sudden power failure. At the same time, report to relevant departments and assist in fire fighting.
After the fire alarm is lifted, it can be dealt with according to the management method when the power supply is restored after a sudden power failure, and the normal operation of the refrigeration system of the cold storage room can be restored.
The above-mentioned problems are only a small part of the cold storage room refrigeration system encountered in the operation. There may be more situations in actual operation. Whether to take emergency shutdown processing or normal shutdown processing, it must be determined according to the specific situation.