Questions about the operation of centrifugal compressors
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If the centrifuge suddenly shuts down, the pressure in the subsequent stage will drop from 4.4 MP to 3.3 MP. The cause of the compressor interlock was identified and resolved within 15 minutes: 1. The inlet to the centrifuge has been disconnected from the system; 2. The centrifuge is driven by a steam turbine; 3. There is an anti-surge system in place; 4. The pressure of the primary seal gas for the dry gas seal is equal to that at the compressor outlet. Is it possible to start the centrifuge without releasing pressure? What would be the consequences and negative effects if it were started?
Are your centrifuges recirculating machines or compressors? Or a combined compressor
Hehe, a compressor cannot be started under pressure, as this will cause it to shut down due to high load during startup. Besides, after jumping out of the car for 15 minutes, did you find out and determine the reason for doing so?
Sure! No problem! Make sure the anti-surge valve is fully open, and pay attention to the sealing pressure as well!
Ours is a combined compressor. The press cannot be started while under pressure; however, releasing a large amount of syngas due to pressure relief is both wasteful and time-consuming. By the time the pressure is reduced, the temperature of the turbine is no longer appropriate, resulting in excessive delays. Therefore, considering this issue, the idea of eliminating the interlocking issues within 15 minutes is merely hypothetical. I hope fellow sailors will come to offer guidance.
I’m looking forward to it; please share your thoughts.
1. The compressor must not be started under pressure. 2. Starting under pressure in this way increases steam consumption. 3 pairs of dry gas seals are not performing well.
I think it can be started under pressure, as it is driven by a turbine. The rotation speed increases gradually; you can consult the compressor manufacturer about this
It can be started; there is a certain level of risk involved. However, given the situation with multiple units, it’s possible to start them without releasing pressure, and there should be no problems. One thing to note though is that the sealing gas should be changed to nitrogen. At rest, using process gas is acceptable, but once the unit starts operating, that’s not suitable.
It has to be started by releasing some pressure; 5 kilograms should be sufficient. Otherwise, the machine will be under too much load. Is it more important to have that amount of air or to protect the equipment? Releasing pressure won’t take long at all.
I think a low-pressure differential with high-pressure nitrogen can be used to switch back to a dry gas seal when full flow prevention is required