Circulating gas compressor
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When our purification unit’s circulation air compressor operates at partial load, setting it to 50% causes the inlet check valve to keep making noise; when it operates at 100%, the temperature at the first-stage outlet rises. Is there any good solution for this?
Is there also a check valve at the compressor inlet? Is there a return pipe? It’s best to upload a picture of the process
1. If it keeps sounding, it indicates unstable inhalation at 50% load; try closing the reflux valve to see, or increase the pressure in the flash tank. 2. An increase in the outlet temperature at the next stage under 100% load may be due to the inlet temperature not being low enough; attempting to lower the temperature of the lean methanol will result in a decrease in the outlet temperature of the flash tank and the inlet temperature of the compressor. 3. The interlock value for the primary outlet temperature of our compressors is 65; I’m not sure what yours is
1. The noise from the inlet check valve at 50% load is caused by a low gas flow rate, which prevents the check valve from remaining open. 2. A 100% high outlet temperature may be caused by a faulty outlet valve, which prevents some of the gas from escaping and leads to repeated compressions, thereby raising the outlet temperature. This is just my personal opinion; please point out any mistakes
It would be best to have DCS screenshots. “100% operation, with an increase in outlet temperature — increase the inlet pressure accordingly, that is, reduce the amount of cooling energy and raise the temperature of the methanol-rich stream during flashing! ! !
This post was last edited by ningzi521 on 2020-8-10 at 11:21. At 50% load, the volume of air drawn in is low; the air enters the compressor cylinder where it is compressed after pressure reduction. This is similar to the surge phenomenon in centrifuges, which leads to increased vibration of the unit and louder noise； At a load of 100, the inlet pressure increases; the corresponding rise in inlet temperature leads to an increase in outlet temperature ； Alternatively, check whether there is any internal leakage at the return valve, and ensure that the cooling water circulation in the cylinder liner is unobstructed to meet the cooling requirements ；