Unstable pressure of the rear pressure regulator valve in an air-temperature type carburetor – seeking advice
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Gentlemen, I’m facing a problem right now. Our company installed an on-site gasification station at the customer’s location; the gasification medium is liquid oxygen, and the design pressure of the storage tank is 0.8 Mpa, with the normal operating pressure being around 0.6 Mpa. There are two vaporizers in use simultaneously, and each vaporizer is equipped with a self-acting pressure regulator that maintains the pressure behind the valve at 0.5 Mpa. There is a problem now: the pressure in the storage tank remains stable, but the pressure before the self-acting pressure regulator fluctuates within the range of 0.6–0.8 MPa, which causes the pressure after the self-acting pressure regulator to fluctuate as well, between 0.44–0.52 MPa. Question: Why does the pressure in the carburetor fluctuate? 1. The liquid oxygen inlet vaporizer pipelines are arranged in sequence, one after the other, but insulation has been added to all of them – is this related to it? 2. In the vaporizers arranged one after another, the latter vaporizer is equipped with a water spraying device while the former does not; is this related to it?
There is no buffer tank in the customer’s pipeline behind the pressure regulating valve; I’m not sure if that matters, but the customer’s pipeline is quite long. The pressure regulating valve might also be related.
It could be caused by the subsequent usage volume, as well as the sensitivity of the control valve; if stability is required, a buffer tube should be added later
For various reasons, you can use the process of elimination to identify the root cause: 1. Whether the gas flow rate is stable, 2. Whether the control valve is functioning properly, 3. Whether the carburetor is operating stably；
Check whether the pressure regulating valve is malfunctioning; if there are large fluctuations in the user’s gas consumption, a buffer tank should be installed.
A stable gas consumption rate must be a significant factor; a buffer tank is quite necessary.
I feel that whether it’s an air bath or a water bath vaporizer, the process of supplying gas to the storage tank occurs in pulses; it needs to accumulate a certain amount of energy before it can release pressure into the storage tank, and this is normal. In our facility, there are 50,000 vaporizers, and every few seconds the flow rate increases suddenly as a way to replenish pressure in the spherical tanks. It is correct to insulate the pipes; gasification should not occur inside them.
Reply to 7#: What’s the ranking? The fluctuations here are a bit large; I’m not sure what the figure is where you are