Does the ammonia synthesis off-gas contain oil?
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May I ask a question from an outsider? In the unpowered ammonia recovery process: The vent gas coming from the liquid ammonia intermediate tank passes through a high-efficiency oil remover before entering the cold box heat exchanger, where liquid droplets and oil vapor are separated (adsorbed). My question is: Does the vent gas contain oil? What is the approximate content in PPM? If an adsorbent is to be used, which one is suitable? Also, does synthetic ammonia contain moisture when released into the air? Is drying necessary before it enters the expander? Regarding the above two questions, I asked those who work in ammonia synthesis; some said yes while others said no, and I’m a bit confused I’d like to get this verified from a normal university!
An old-fashioned reciprocating cycle air compressor, with the exhaust gas being discharged after compression. Released gas contains oil.
The synthesized off-gas contains a small amount of oil contamination; there should be no moisture present. In typical ammonia synthesis processes, the gas supply is introduced at the outlet of the ammonia cooler and at the inlet for ammonia, which helps to remove trace amounts of CO2 and oil from the fresh gas. Therefore, since liquid ammonia contains oil contamination, the off-gas also contains oil.
The vent gas should be free of oil contamination, as there is no possibility of oil or water being introduced along the path from the synthesis tower to the heat exchanger where ammonia is separated. Furthermore, the circulating air in the circulation machine passes through devices such as system oil separators and make-up air filters. . . The released gas can be recovered through membrane treatment
Will there be trace amounts of moisture when exposed to air? Since it needs to go into a cryogenic heat exchanger, strict requirements are imposed on the dew point.