How to calculate the PSA hydrogen yield
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The hydrogen content in the purified gas produced by our plant reaches 40 percent. We have tried to reduce this level by increasing the adsorption time, but with little success. I would like to know what the current hydrogen yield is and how it can be calculated
Using the principle of mass conservation for hydrogen, the yield = (purity of the produced hydrogen * flow rate of the produced hydrogen) / (hydrogen content in the medium-temperature gas * flow rate of the medium-temperature gas). The yield is generally in the high 80s
There is also a derivation formula: yield = Y*(X-Z) / X*(Y-Z), where X represents the hydrogen content in the intermediate gas, Y represents the hydrogen content in the product, and Z represents the hydrogen content in the desorbed gas
The hydrogen recovery rate is calculated by dividing the amount of hydrogen in the product gas by the amount of hydrogen in the medium-temperature shift gas components; currently, this rate can generally exceed 90%, with better systems achieving up to 92%.
The hydrogen yield and the hydrogen recovery rate are probably two different things.
Unless changing the monotonic time of the PSA process has no effect
This issue has been successfully resolved. The analyzable hydrogen content drops to around 10 percent