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Emissions of supermarket refrigerated showcase refrigeration system (3)
supermarket refrigerated showcase Emissions of refrigeration system (3)
Lubricant emission
In supermarket refrigerated showcase systems that use ammonia as a refrigerant, ammonia is often discharged because ammonia is often insoluble lubricating oil. Using the principle that ammonia is lighter than lubricating oil, the oil in the system is discharged through the special oil drain device — under the action of the pressure difference.
Possibility of lubricating oil entering the system
(1) When the refrigerator is working, the compression end temperature is relatively high, especially when ammonia and R22 single-stage compression, the exhaust temperature generally changes between 70~130℃. At high temperatures, part of the refrigerating oil will become vapor, and the hot vapor of the refrigerant will enter the system. As the temperature of the lubricating oil increases, its evaporation also increases. For example, the evaporation rate at 80°C is 3.13%, the evaporation rate at 100°C is 7.6%, the evaporation rate at 120°C is 16.03%, and the evaporation rate at 140°C is 34.68%. In these cases, during the air load test, it can be seen that the exhaust gas contains oily smoke. In the case of high exhaust temperature, the lubricating oil will also be carbonized and coked, adsorbed in the exhaust valve plate and exhaust cavity, which directly affects the operation of the valve plate.
(2) Because the refrigerant moves quickly in the cylinder, the compressor discharge speed is as high as 24-30m/s, so it is easy to bring some lubricating oil into the refrigeration system. Or due to the failure of the oil scraper ring, the gap between the piston and the cylinder increases, and the lubricating oil is lifted along the cylinder wall to the top of the piston and enters the system along the exhaust pipe. Although there is an oil separator in the pipeline, lubricating oil is still brought into the system, especially when the maintenance work is not sound, this phenomenon is more serious.
supermarket refrigerated showcase The harms of oil storage in the system
(1) When the lubricating oil enters the ammonia system, as the temperature of pipes, equipment and refrigerant drops, the lubricating oil is adsorbed on the heat exchange equipment in an oil film state (such as condensation This greatly increases the thermal resistance and reduces the heat exchange capacity of the supermarket refrigerated showcase equipment, which is not good for improving the cooling efficiency. R12 and oil dissolve each other, and the formation of oil film on the heat transfer surface is much weaker.
(2) Oil accumulation in auxiliary equipment and pipelines will inevitably reduce its working volume. As the temperature drops, the viscosity of the oil increases, and dirt and mechanical impurities are mixed with the oil to adhere to the inner wall of the pipeline, which seriously affects the area of the refrigerant passage, thereby forming resistance. If the above two harms are not eliminated in time, the cooling capacity of the refrigerator will decrease over a long period of time, the power consumption will increase, and the working efficiency of the equipment will decrease. Therefore, the oil must be drained regularly.
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