Is it necessary to replace the compressor valves during shutdown cycles?
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In a hydrogen production plant, the gas that enters the compressor during normal operation is natural gas or reforming off-gases (primarily hydrogen). During the nitrogen circulation process with shutdown, the gas medium becomes nitrogen. Is it necessary to replace the compressor’s air valve before starting the cycle? What are the negative effects if a ventilation valve is not used? Is it very dangerous? I hope everyone can discuss this and share their knowledge*
During the shutdown process here, the compressor’s gas valve was not replaced at that time. At that time, the compressor outlet temperature was a bit high, around 120 degrees, so the circulation was stopped in advance. What is the principle of a gas valve?
There is no need to replace the gas valve; however, when compressing nitrogen, it is sufficient to control the compression ratio, which in turn controls the exhaust temperature
No replacement is necessary, provided that care is taken during operation to ensure the exhaust temperature does not exceed the limit; otherwise, the gas valve will not be able to withstand it； Additionally, during operation, its inlet and outlet pressures (i.e., the compression ratio) need to be adjusted.
It’s not necessary; just control the outlet temperature properly
What if the outlet temperature is too high?
Can the compression ratio also be adjusted? Isn’t it already set by the manufacturer?
It is best to replace the valve, as different shooting conditions may lead to high outlet temperatures and problems with the force acting on the piston rod
I would like to understand the working principle of gas valves – why a change in the gas medium leads to changes in the outlet temperature
There is no need to replace the gas valve; as the specific gravity of the medium increases, the outlet temperature can be controlled