Problems in achieving the targets for hydrogen production via pressure swing adsorption?
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We are preparing to install a pressure swing adsorption hydrogen production unit; the feed gas for this unit is gas that has been decarbonized using pressure swing adsorption. The required specifications are that CO levels must not exceed 5 ppm, CO2 levels must not exceed 10 ppm, and the total sulfur content must not exceed 0.1 ppm. Is it possible to meet these specifications?
It depends on what the main components of your feed gas are; under normal circumstances, there should be no problem
Could you tell me the instance? Everyone is talking about what purity levels can be achieved, but we haven’t seen it in reality, so we really hope to see it!
If you have a hydrogen production unit available beforehand, then after passing through the PSA purification system, the concentration of CO+CO2 is less than 20 ppm, and the purity of hydrogen can reach 99.99%. As for purifying the reforming gas, the above standards can also be met; regarding sulfur content, it depends on the composition of the adsorbent – if a desulfurization agent is used, then there will be no problem.
Theoretical requirements now dictate that it should be possible to meet the technical specifications, but it’s not entirely clear what the actual situation is in terms of whether this can indeed be achieved
No problem, there are many devices of the same type in operation. The cost, or operating expense, associated with achieving different metrics varies slightly
Consider adding a methanation unit after the PSA; this will help maintain a stable level of carbon content. We are also discussing this process route (hydrogen production from methanol off-gas).
If alkylation is carried out after low-temperature methanol washing, how should this heat be dealt with? Can it be balanced? This process still requires some skill to achieve balance
It’s not a big problem; the targets can be met； We require CO to be less than 1 ppm
Can 1 ppm be achieved through pressure swing adsorption? It’s quite difficult to achieve this indicator. Could you introduce your device? !
1 ppm is still quite difficult to achieve, but what the original poster mentioned is still attainable. Additionally, attention should be paid to the methane level as well; sometimes methane can cause problems as well