Can the circulating hydrogen compressor be started under 0.6 MPa of nitrogen? What are the sayings?
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At the nitrogen operating condition of the compressor, the inlet pressure is 3.0 MPa and the outlet pressure is 6.0 MPa. If the system cannot be started, how can voltage be increased at the beginning of its operation?
0.6mp？ 3mp? 6mpa? Not only is the issue unclear, but the numbers are also inconsistent
The original poster didn’t express themselves clearly. Is it true that when the compressor is shut down, the inlet pressure is 3.0 Mpa and the outlet pressure is 6.0 Mpa, preventing the compressor from starting? If that’s the case, then the piston is stuck. Just like when a person is riding a bicycle and someone is pulling them from behind while they are at rest, can they keep riding? The common method is to install a bypass valve between the inlet and outlet; open the bypass valve, wait until the machine reaches its rotational frequency, then open the exhaust valve, close the bypass valve, and finally open the compressor intake valve.
What I mean is that the pressure of low-pressure nitrogen in the device is 0.6 MPa; after purging the system to ensure airtightness, this pressure of 0.6 MPa is maintained. Can the cycle hydrogen compressor be started directly to increase the pressure? The compressor data sheet provided by the manufacturer specifies that for nitrogen, the inlet pressure is 3.0 MPa and the outlet pressure is 6.0 MPa
What the manufacturers provide are recommendations – the values that cause the least damage to the compressor. You can also start the compressor at 0.6 MPa, but be sure not to close off the circuit completely to prevent surging in the compressor, as well as to avoid excessive exhaust temperature in the compressor
According to the manufacturer’s recommendations, when starting the cyclic hydrogen compressor, the system pressure should be at least 1.0 MPA; it is better to start it at 2.0 MPA.
It should be possible to start it; once it’s running, increase the flow rate on the return line to maintain the inlet pressure. By turning on the compressor, you’re adding pressure to the system, and as the system pressure rises, the inlet pressure of the machine will also gradually increase until it reaches the desired level. Just be careful of the exhaust temperature when starting it up for the first time.
Why not use a new hydrogen compressor to pump nitrogen and raise the system pressure? With such low system pressure, it is uncertain whether there is enough air in the system for the turbine to draw on; surge can occur easily
Judging from the data, you must be using a reciprocating cycle hydrogen compressor. Reciprocating cycle hydrogen compressors also have a pressure-raising function; starting with an inlet pressure of 0.6, the pressure is gradually increased until the temperature limits of the compressor bearings and valves are reached, after which the cycle can be adjusted. The maximum pressure that can be achieved at this point depends on the temperature of the equipment.