What are the causes of coking in the oil filter of ammonia refrigeration screw compressors?
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The oil filter of the ammonia refrigeration screw compressor has clogged; part of the oil circuits are blocked. The buildup is milky yellow in color, has a certain degree of hardness, and can be broken apart. Lubricant No. 46: The oil and ammonia work together, at a temperature of over thirty degrees
Which brand of ammonia refrigeration compressor? It is related to the purity of ammonia
This is not coking; it is earthy-yellow in color, brittle, and porous, and appears to be an oligomeric amide. This could be due to inadequate purging of the pipelines, issues with the quality of the engine oil, problems with the ammonia refrigerant (recycled ammonia should not be used as a refrigerant), or poor cooling of the cylinder liners, with high temperatures leading to the formation of amide-based chemicals.
This is how our process works: ammonia is used as a refrigerant, and it goes through repeated cycles of compression and vaporization. The compressors are of the screw type, and the temperature levels remain within the specified ranges. If the cleaning isn’t thorough, rust and old oil may still remain
It’s from Dalian Ice Mountain; it has nothing to do with purity
I encountered this situation many times in the past two years; in various places, I faced such circumstances
This is a very common problem. It is very likely that we chose a lubricant without ammonia resistance; the additives in ordinary domestic lubricants react with ammonia, resulting in the formation of this yellow substance. The standard for domestic ammonia-resistant turbine oils is SH 0362; you can purchase Kunlun or Great Wall ammonia-resistant lubricants. The additives in high-quality lubricants from foreign countries do not react with ammonia; therefore, such lubricants generally do not have standard ammonia resistance. If domestic anti-ammonia turbine oils are not effective, you can try foreign products.
It’s caused by the lubricant; change to an imported brand
After hearing your analysis, I’m pretty sure it’s the lubricant reacting with ammonia