Methods to reduce hydrogen in the desorbed gas in the PSA unit of a hydrogen production plant
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Methods to reduce hydrogen in the desorbed gas in the PSA unit of a hydrogen production plant； The hydrogen purity in the PSA off-gas I produce is consistently around 25%. Is there any way to reduce this hydrogen purity and increase the hydrogen recovery rate?
Adjust the adsorption time; increase it
Extend the adsorption time without compromising product quality, and reduce exhaust gas pressure without affecting the combustion in the heating furnace. To be honest, at present in China, for PSA operations, such a hydrogen content falls within the normal range, so no major adjustments are needed
25% hydrogen is quite low; little adjustment is needed. Here, it’s over 30%
A hydrogen purity of 25% in the exhaust gases is sufficient, with a yield of over 90% being acceptable. If possible, it would be useful to check the quality of the hydrogen product, as this could allow for improvements to the operating system
The last edit to this post was made by Wenwu6963 on 2015-10-14 at 09:14. There are usually three methods to increase the recovery rate using PSA: 1. Using adsorbents with high adsorption capacity and high separation coefficients. 2. A vacuum regeneration process is adopted. 3. Try to increase the number of effective voltage equalization attempts.
Without increasing energy consumption, 1. Increase the adsorption time； 2. Increase processing volume ； 3. Reduce the outlet temperature of the conversion furnace ； 4. Reduce the water-carbon ratio ； 5. Check the PSA programmable valve for any internal leakage and contact the instrumentation team to handle it.
The hydrogen in the desorbed gas and the regeneration process are related to the adsorption time; if the adsorption time is shortened, frequent regeneration will result in an increase in the hydrogen content in the desorbed gas, while extending the adsorption time will reduce this hydrogen content.
A high hydrogen content in the desorbed gas indicates that there are no issues ahead; increasing the adsorption time and raising the system pressure works!
I need to know the detailed operation data so that everyone can analyze it for you
It depends on the quality requirements for the hydrogen product. Provided that the quality is satisfactory, increasing the adsorption time and using secondary PSA to treat the exhaust gases will help