Can a non-air compressor compress air?

If you use it just once, there should be no problem, but it definitely won’t work if used for production over a long period of time.

I’m talking about centrifugal compressors. Are there any safety concerns? Some people say there’s a risk of explosion due to the lubricant coming into contact with air, but I think the flash point of lubricants is quite high; as long as the temperature in the compressor doesn’t reach that flash point, it’s possible to compress air. Am I correct?

Well, according to what you say, it’s still hydrogen sulfide that flows through the hydrogen addition and recycling unit; no problems seem to be arising~~~

This seems a bit different; hydrogen sulfide and hydrogen have very low oxygen content, so the issue of explosion is basically not a concern under the required oxygen levels. What’s being discussed here is that there is air inside the machine, and the oxygen content is sufficient. If this air comes into contact with lubricating oil, could it form explosive substances together with the oil vapor? Could an explosion occur under operating conditions?

This post was last edited by CHANGBAISHI on 2017-4-12 at 11:22. Adjusting the inlet and outlet pressure as well as the flow control parameters according to the medium density will make it usable.

If the original medium is clean, free from carbon deposits, and has a molecular weight not significantly different from that of air, compressed air can be used~~

Is it really possible to start the compressor that is used to transport combustible gases during normal production, while using air for system purging?

I have seen before, during pipeline purging, the circulating hydrogen compressor being started up to carry out purging using air; the compressor inlet is opened, a temporary filter is installed, and the circulating hydrogen compressor is operated with air for purging purposes. Later, many years later, whenever I suggested using this method for purging, it was always rejected; either the equipment manufacturers refused outright without giving any reasons (there was a nitrogen-based option, but no air-based option). Either the company itself refuses, saying that air will explode once it comes into contact with lubricant. I checked again; the open flash point of lubricating oils is at least 180°C or higher (the closed flash point is lower, but no data was available for that). No data available for the explosion limit of lubricating oil. I also found that some compressors use instrument air as the isolation gas. I also found that some manufacturers use air blowing to start the compressor as part of their solution. Now I’m really stuck; I advocate starting the compressor to use air for purging, but this approach isn’t accepted in actual work.

Gas molecules have different molecular weights. It may cause compressor surge