Condensate water on the outer wall of PSA pipelines in hydrogen production units
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I just can’t figure out what the reason is
Is it because reformed hydrogen has been added that the temperature is low?
Gas compression is an endothermic process during the desired process. If the PSA leakage rate is high, for example if the pressure drop takes a long time and the flow rate is high, it can cause heat absorption in the pipes, leading to the condensation of moisture in the air present on site. This effect is more noticeable in autumn, while it’s less significant in other seasons
This usually occurs in purge pipes; condensation in autumn and freezing in winter happen because the pressure difference before and after purging causes the large pipes to absorb heat.
The PSA in the natural gas hydrogen production plant does not use hydrogen from reformed gas
This is the Joule-Thomson effect: when a gas is compressed and then expanded under reduced pressure, it absorbs heat and its temperature drops, resulting in a cooling effect. The area surrounding the pipe walls also cools down, which causes the pipes to sweat, frost over, or freeze – and this is a normal phenomenon.
The voltage equalization process involves throttling and pressure reduction, resulting in a cooling effect