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8-54 What is the impact of high oil mist content in compressed air on the operation of the dryer?
The high oil mist content in compressed air forms a thick oil film on the copper tube of the dryer's heat exchanger, reducing heat exchange performance and causing operational issues.
Подробности дела
Answer: The exhaust oil content of air compressors is different. For example, the exhaust oil content of domestic piston oil-lubricated air compressors is 65~220mg/m3. The exhaust oil content of low-oil lubricated air compressors is 30~40mg/m3. The exhaust oil content of so-called domestic oil-free lubricated air compressors (actually semi-oil-free lubrication) is also 6~15mg/m3. Sometimes, due to the damage and failure of the oil-gas separator in the air compressor, the oil content in the exhaust of the air compressor will increase greatly. After the compressed air with a large oil content enters the dryer, a thick oil film will be formed on the surface of the copper tube of the heat exchanger. Since the heat transfer resistance of the oil film is 40 to 70 times greater than that of the copper tube, this greatly reduces the heat exchange performance of the precooler and evaporator. In severe cases, the dryer cannot work normally. The specific manifestations are that the evaporation pressure drops while the dew point rises, the oil content in the exhaust of the dryer increases abnormally, and the automatic drainer is often blocked by oil. In this case, even if the oil removal filter is constantly replaced in the cold dryer pipeline system, it will not help. The filter element of the precision oil removal filter will soon be clogged with oil. The best way is to repair the air compressor and replace the oil-gas separator filter element so that the exhaust oil content reaches the normal factory index.
