Refrigerant oil cooler operation requirements in ammonia refrigeration
1 The correct installation of the ammonia refrigeration system ensures that the liquid supply and return air are smooth;
2 The working fluid side must reduce the oil content: in the ammonia refrigeration system, although the compressor exhaust gas passes through the oil separator, it will inevitably entrain some lubricating oil. After cooling and condensing, the oil will flow along with the refrigerant liquid. Into the siphon tank, if the siphon tank is not drained in time, some of the lubricating oil will enter the oil cooler. Since the oil is difficult to be taken away, the oil will accumulate in the tube section of the oil cooler, occupying the heat exchange area, affecting Heat exchange. Causes high oil temperature. Therefore, in the operation of the ammonia refrigeration system, it is necessary to drain the siphon tank. If some of the oil has already entered the oil cooler, it is necessary to drain the oil cooler.
When draining the working fluid cooling oil cooler, first close the oil cooler inlet valve. The compressor is started, and the working fluid remaining in the oil cooler is heated by the exhaust gas temperature to evaporate. When the oil temperature reaches about 60 °C, the oil is shut down, and the oil-cooled return air valve is closed. Use a pressure release pipe to connect the oil drain valve on the oil cooler to drain the oil directly or through the oil collector.
3 must pay attention to the cleanliness of the oil.
4 Periodically open the oil-cooled upper suction valve.
The oil temperature of the 4 working fluid cooling oil cooler is greatly affected by the condensation temperature (condensing pressure). During the summer operation, the condensing pressure can be appropriately reduced, and the method of venting frequently ensures that the oil temperature is not high; in winter, the condensing pressure can be appropriately increased or the working fluid flow can be controlled to ensure the oil temperature is normal.