Regeneration cycle of hydrogen production PSA
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May I ask, what is the typical PSA adsorption time in natural gas-based hydrogen production plants? Knowing the amount of nitrogen used in each regeneration, it is necessary to estimate the total amount of nitrogen required. Thank you~
If the process is advanced, it is entirely possible to do without nitrogen regeneration; the process equipment you mentioned might be a bit outdated, so only by examining the specific equipment can it be determined how much nitrogen is needed
During regeneration, reduce the pressure first; if the pressure is high, flush with product gas once it reaches atmospheric pressure. If the pressure is low, evacuate first and then flush with product gas! The advantage is that no nitrogen is needed, but the yield of the product gas is slightly lower!
The conditions are too vague to answer properly； It is generally believed that a regeneration time of 40 seconds is sufficient!
The adsorption time for purifying hydrogen using PSA is generally 240 s. As for the regeneration time, it depends on how many towers you have gone through.
If PSA is used to purify hydrogen gas and the 5-1-3 process is employed, the time required ranges from 540 seconds to 600 seconds; however, this depends on the purity of the hydrogen gas in the feedstock as well as the purity of the hydrogen gas obtained as the output
The adsorption time is related to factors such as the number of PSA towers, the pressure equalization procedure, the feed flow rate, and the properties of the material; it’s difficult to say exactly how long it will take
Why is the adsorption process so short? Do we have to switch every few minutes? Then wouldn’t system equipment disturbances be very severe?
In air separation, TSA is switched every 4–6 hours, with regeneration carried out using contaminated gas under pressure