Oil drainage pipeline frosting
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The compressors used in the synthetic ammonia production process at the company contain mainly nitrogen, hydrogen, and a small amount of ammonia. An oil filter is installed at the compressor outlet; the oil discharge pipeline of this filter sometimes freezes up when oil is discharged. I would like to know to what extent oil and ammonia are miscible with each other, and why this situation occurs frequently when the ammonia content is too high
It’s normal for frost to form when liquid ammonia evaporates; ammonia is highly soluble in water, but it is also soluble in oil
Ammonia is present in the oil drain, so it is normal for the oil drain pipes to frost over.
The throttled release of high-pressure gas also absorbs heat and can cause frosting in the pipelines; however, as described by the original poster, it is likely the evaporation of liquid ammonia that absorbs the heat.
Your waste gas pressure reduction is an endothermic process, so frosting occurs.
The depressurization process is endothermic, and combined with the evaporation of ammonia, frosting occurs more easily