Hydrogen compressor
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The facility has two hydrogen compressors, which operate normally with hydrogen as the working medium. The compressor is now being tested; since hydrogen is not available, air is being used for testing, which results in an excessively high temperature at the compressor’s outlet. What could be the reason?
The molecular weights of hydrogen and air differ significantly, and the heat generated by the air acting on the hydrogen valve also varies greatly
At the same volume flow rate, the mass of air is much higher than that of hydrogen; therefore, more energy is required to compress the same volume of air. This energy is ultimately converted into heat. By using the current temperature during testing, it should be possible to determine whether the requirements of the design are met
The gas valves used are different~~~~because the quality of the gases varies. We replaced the nitrogen-operated valves during the nitrogen testing period~~~~~
Air cannot be compressed, which can lead to excessively high exhaust temperatures; ammonia, on the other hand, has a cooling effect. It can be used as a makeshift air compressor for pressure testing, but it is necessary to keep the exhaust temperature from rising too high
I don’t quite understand; I hope an expert can explain it further.
The density of air differs significantly from that of hydrogen. When a reciprocating machine is operating at 100% capacity, the volume remains constant; as a result, more work is done by the equipment, which leads to heat generation. It is recommended that such testing be carried out with the supplier’s permission, or in accordance with the supplier’s testing procedures. Conduct testing for as short a time as possible.
It is recommended to conduct a no-load test before the load test
The specific gravities of air and hydrogen are different, which leads to an increase in the energy required during testing, thereby raising the temperature of the equipment. In my personal opinion, it is necessary to follow the manufacturer’s test plan.
I read the answers above and got it, haha