How does PSA hydrogen production balance product purity and hydrogen yield?
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Our company plans to install a PSA hydrogen production system using converted gas, with a production capacity of 10,000 units, and the required purity level is 999. In the initial design, the exhaust gases are burned off, resulting in a hydrogen yield of only around 75% – isn’t that a shame? I checked some application information; the hydrogen with high yields has low purity ； High purity results in low yields. It seems impossible to have it all perfect. I would like to ask the experts: how should we strike a balance between these options, or are there any good solutions?
It’s a pity, but there’s no way to have it all. It’s hard
The hydrogen yield is generally above 80%, and our PSA-H2 system achieves a yield of around 85%. The production rate is 3900 Nm3/h; I think there should be a benchmark for adjusting the balance between product gas purity and yield ； Then go and adjust it ； For example, if the purity of hydrogen reaches 4 nines, it is possible to appropriately extend the adsorption time to increase production and yield; however, it is necessary to monitor any changes in hydrogen purity to avoid producing substandard products. If the volume of the feed gas remains stable, then the adsorption time should be extended based on the purity of the product gas in order to increase the yield ； Sometimes the yield is related to temperature, the performance of the adsorbent, and the analysis of the system; a comprehensive analysis is required.
Increasing the number of adsorption towers reduces the adsorption time, thereby improving purity
The yield for products with 4 nines can all reach over 80%; there’s an issue with your 75