Feed pump switching issue in hydrocracking reaction
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Switch from P101B to P101A; at 17:29, connect the test pump line of P101A with a length of 110 mm, start the motor of P101A, and close the outlet valve of P101A. The P101B test pump line was started; the flow rate at the pump outlet was reduced from 314.6 t/h to 106.2 t/h, causing the temperature of the reaction bed to rise sharply. The quench hydrogen valve was opened fully to control this temperature increase. The test pump line for P101B was shut off; as a result, the outlet pressure of pump P101B dropped from 15 MP to 13 MP, while the system pressure remained at 14.98 MP. Despite adjusting the flow rate, the outlet pressure of the pump failed to increase. At 17:55, pump P101A stopped operating, and the outlet pressure of P101B was 14.5 MP. Why can’t the pressure of P101B be increased?
It’s written too messily; it’s not clear to read. Which one should be cut off? In the end, the outlet pressure of P101B was 14.5 MP and the system pressure was 14.98 MP; at 17:55, P101A stopped operating, which didn’t cause a shutdown? The original poster, please explain in more detail. It’s better to be clear.
Reply to 2# hn2005: To switch from P101B to P101A, first turn on P101A and enable self-circulation via the test pump line; the outlet of P101A should be closed. P101B is the operating pump; its pressure is 14.5 MP, and there is an abnormal noise. The back pressure at the outlet is too high, as if the pump is stuck.