Can the nitrogen used for the compressor seal be replaced with instrument air?
Thread Content
The image shows steam reverse compression, with nitrogen being introduced at the machine seal. I would like to ask whether this nitrogen can be replaced with instrument air
To set the properties of your conveying medium, nitrogen is required for flammable materials
It is generally not recommended to use instrument air as a substitute for the nitrogen used for the compressor seal. Since instrument air may contain oil and moisture, these impurities can affect the proper operation of the mechanical seal as well as its sealing performance; long-term use can also lead to equipment damage. Nitrogen, being relatively dry and pure, is more suitable for use in creating a sealed protective environment. .
Leakage of process gas can create an explosive mixture, posing a safety hazard
If the medium can tolerate oxygen, instrument air can be used as a substitute; otherwise, it cannot.
From a technical perspective, it is feasible; however, there are still risks associated with long-term safe operation, and these risks increase over time
Since the instrument air contains oxygen, if there is a leak in the compression medium, it is very likely that the pressure level will reach its critical limit; moreover, the risk of an explosion during the operation of rotating equipment is extremely high: P
It is not recommended to switch to instrument air; one reason is the nature of the process medium, as the use of instrument air can pose potential risks. Another issue is the oxygen present in the instrument air; it affects the lifespan of the mechanical seal when it enters that system (especially since, during operation of the mechanical seal, heat cannot be removed promptly, and factors such as the properties of the medium itself accelerate coking due to the oxygen in the instrument air)