Under normal conditions, the reforming cycle hydrogen compressor does not experience surge, so why is a surge protection line still installed?
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The reformer recycle hydrogen compressor has been replaced with a centrifugal compressor. Under normal circumstances, as the hydrogen circulates, no surging occurs at the point where the outlet connects back to the inlet. However, why is there also a surge prevention line installed on the unit itself? Some say it’s meant for quickly pressurizing the system during startup, but I don’t quite understand this. I hope someone knowledgeable can explain what its actual purpose is. Additionally, under what conditions does the reformer recycle hydrogen compressor experience surging?
The setting of the anti-surge line is mainly to protect the unit.
If the feed is interrupted and hydrogen production decreases, surge phenomenon occurs; a surge protection line is installed to protect the compressor. But I don’t have that here; 500,000 tons of reforming capacity
The demister ahead is broken; is there liquid phase entrainment?
The demister ahead is broken; is there liquid phase entrainment?
The demister ahead is broken; is there liquid phase entrainment?
Surge typically occurs when the intake flow rate is insufficient. The anti-surge line is used to supplement the inlet flow with outlet flow, thereby preventing surge and protecting both the equipment and normal process operations. At times, when the pressure in the high-pressure section of the reformer becomes too low, this line can be opened to maintain the pressure within the reaction system and thus control the rate at which coke forms on the catalyst.
It’s not only to protect the equipment, but also to optimize the operation of reaction pressure and ensure stable production
In short, it is for safety reasons. Moreover, while small units do not necessarily require anti-surge lines, large centrifugal units must have them. This is also related to the concentration and pressure of the medium; surge can easily cause resonance in the unit, and once resonance occurs, it is extremely dangerous!
Compared to shutting down the compressor due to surge, the cost-benefit ratio of setting an anti-surge line is significantly different; moreover, in most cases the compressor does not operate at a constant load, and changes in load can lead to surge conditions. It must be set.