What is the effect of the inlet temperature of a centrifugal compressor on the compression outlet pressure?
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For centrifugal compressors, when the inlet gas has the same composition, pressure, and rotational speed, which outlet pressure will be higher: that corresponding to a higher temperature or one corresponding to a lower temperature?
For centrifugal circulators: a higher inlet temperature results in a higher outlet temperature, an increase in system pressure drop, and an elevated outlet pressure. For centrifugal boosters: the outlet pressure is determined by the back pressure. If the system is stable and the inlet temperature is high, then the outlet temperature will also be high; the system pressure drop increases, and the outlet pressure rises. It’s hard to say if the system is unstable.
This post was last edited by shmily327 on 2010-4-28 at 10:56. Higher temperature results in higher outlet pressure, and compressors also operate more efficiently at higher temperatures!
Personally, I think the outlet pressure should be high when the temperature is low. When the inlet gas has the same composition, pressure, and rotational speed, a lower temperature results in a higher density; therefore, the output power of the centrifugal compressor should increase, and the outlet pressure will rise accordingly.
I agree with the view from the fourth floor: if high temperature leads to high outlet pressure, then why are coolers installed in between stages in multi-stage compression? Of course, it is also related to system pressure and the operating condition of the system
At a constant flow rate, the lower the outlet temperature, the lower the compressor power. Therefore, pyrolysis gas compressors are equipped with water injection systems; when the amount of water injected increases by 4%, the compressor power decreases by about 1–2%, while the power in some sections decreases by 4%
This post was last edited by lllllljjj on 2010-4-28 at 14:27. 5# Li Yunfei: Gas compression is itself an exothermic process. For the next stage of compression, a cooler must be added in between. Without a cooler, the temperature becomes too high and the compressor cannot handle it.
The views on the fourth floor are fairly agreeable. This is a general rule. One thing to note is the properties of the medium
Based on the formula PV=NRT, and using the method of controlling variables, it is easy to see that the inlet pressure should be kept as low as possible; the higher the pressure, the better, as long as the systems on both sides allow it. If the inlet pressure is slightly high, the outlet pressure will also be slightly high; I’m referring to centrifugal compressors – I’m not sure about other types of machines
I agree with the view from the fourth floor: high temperatures result in high outlet pressure, so coolers should be installed between the various compression stages. This is also something that is covered in our operation training