Seek an explanation for the effect of the anti-surge valve in the hydrogen circulation machine on exhaust temperature
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After nitrogen is pressurized to 2.0 MPa at the start of diesel operation, the hydrogen circulation pump is started; due to the large molecular weight of nitrogen, the exhaust temperature is already 80°C at startup. The anti-surge valve is gradually closed, and the exhaust temperature continues to rise. I don’t understand why closing the anti-surge valve results in an increasing exhaust temperature. Please advise, thank you
One additional question: Do the return valves of the recycled hydrogen compressor and the new hydrogen compressor work on the same principle? (It feels the same as a new hydrogen compressor.)
What is the variation in the inlet temperature and inlet flow rate of the hydrogen circulation pump? For the new hydrogen machine, not that much return flow is needed; whereas for the recycled hydrogen machine, it’s not sufficient – the flow goes directly to the inlet via a short circuit, which is different
If the speed remains unchanged but the amount is reduced, it should have some impact, right?
The anti-surge line reduces the outlet pressure and increases the inlet flow rate. With an increased flow rate, the heat generated by the compressor’s work can be carried away more effectively by the larger volume of gas, so the temperature drops. At the same time, the outlet pressure decreases, indicating less work being done and thus a lower temperature. If the situation were reversed, wouldn’t the temperature rise instead?
Has the pressure difference between the inlet and outlet of the compressor increased?
Is the pressure difference at the inlet and outlet increasing, meaning that only one cylinder is doing work?
The pressure difference increases, which leads to an increase in the temperature of the compressed gas. Generally, an anti-surge valve is set to a certain opening degree to prevent the temperature at the compressor outlet from becoming too high.