Analysis of the causes of ice blockage in the screw chiller refrigeration system: The screw chillers commonly used in various industries are mainly air-cooled screw chillers and water-cooled screw chillers, while screw chillers produce “ice blockageâ€. It means that in the throttle section of the thermal expansion valve, moisture icing occurs to form a blockage.
For the chiller refrigeration cycle system with freon as the refrigerant, since the Freon refrigerant and water are mutually insoluble, when the freon containing water passes through the thermal expansion valve, the free state water is separated from the Freon, at low temperature. Icing and blocking pipes and valves. On the other hand, in the case of mixing with water, Freon has poor chemical stability, easily generates acidic substances, and corrodes the pipes and inner surfaces of the screw chiller. Therefore, for Freon refrigeration systems, the water content is expressed in mass fraction and should not exceed 0.0025%.
The water content of the screw chiller freon refrigeration system mainly comes from the following situations:
1. After the system is installed, the internal air is not exhausted and there is moisture;
2. Enter the air when overhauling and charging;
3. The low pressure part leaks, and enters the air when the pressure is lower than the local atmospheric pressure;
4, Freon itself is not pure, containing moisture and other factors.
Therefore, before the refrigerant system of the screw chiller is filled with refrigerant, it is necessary to perform drying work and install a dry filter in the Freon refrigeration system. For the dry filter installed in the system, due to the long running time, the water absorption efficiency is poor and must be replaced in time. The chiller produced by Dongyuejin chiller plant will be filled with refrigerant and lubricating oil before leaving the factory. If there is a fault in the operation of the unit, it is necessary to charge the refrigerant. It is recommended to contact the chiller manufacturer for processing to ensure safe and reliable operation of the unit.
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