Fluctuations in the third-stage work of the new hydrogen compressor in diesel hydrogenation
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The third stage of the new hydrogen compressor used in diesel hydrogenation has been showing abnormal power consumption recently. At certain moments, the power output of the third stage decreases suddenly, while the power output of the second stage increases accordingly; however, after a few minutes, everything returns to normal. The flow rate of new hydrogen also fluctuates as a result. What is the cause of this?
The third-stage discharge pressure decreases, the system pressure drops, the third-stage inlet pressure rises, the work done in the third stage is reduced, the amount of fresh hydrogen supplied decreases, the temperature of the third-stage cylinder falls, while the temperature of the second-stage cylinder rises. It should also be noted that the third stage consists of two separate cylinders, with the first three stages and the last three stages being distinct from each other; the temperature differences between the inlet and outlet temperatures in these two sets of cylinders are both around ten degrees, with a consistent difference. . .
Is it capable of stepless air volume adjustment? Has the air valve been checked for any issues?
It’s likely there’s a problem with the valve, but I haven’t had time to check it yet; it has returned to normal recently. It features stepless adjustment. . .
Under normal circumstances, the lower the pressure in the buffer tank at the inlet of the new hydrogen compressor, the higher the temperatures at its various outlets, right?
The new hydrogen compressor in my workshop started making unusual noises, and then suddenly stopped working at stage 3; it continued to operate at stage 2 to reach the system pressure. I immediately shut down the machine at that moment – the safety valve activated
Under normal conditions this is the case, but when stage 3 does not operate properly, it causes the work done by stage 2 to increase suddenly; the compression ratio of stage 2 rises significantly, while that of stage 3 decreases significantly. . .
Yes, stage 2 is actually the stage where overpressure occurs most easily. In stage 1, pressure is occasionally relieved by venting, while after stage 3, the system itself is used for pressure relief. This is especially evident when considering converting the compressor to an automatic control system. Secondary work will be significant, resulting in overpressure that triggers the safety valve to open; if the pressures at stage one and stage three are too high, automatic venting to the flare will occur. . .
What is the reaction pressure? Why is three-stage work required? The pressure in our system is 6.4