How is the PSA yield of a hydrogen production plant calculated? ?

We haven’t started yet; let’s learn together!* ! !

One of the calculation methods is: Hydrogen recovery rate (%v.) = {Product hydrogen flow rate (Nm3/h) * Product hydrogen purity (%v.)} / {Feed hydrogen flow rate (Nm3/h) * Feed hydrogen purity (%v.)} * 100%

I agree with your view. The PSA design specification should contain detailed calculation formulas. How do you calculate the yield of your entire hydrogen production plant? Is it the mass of product hydrogen/mass of raw material?

Yes! Considering only hydrocarbon feedstocks, steam supply to the converter is not included. How did you calculate it?

Method for calculating the PSA hydrogen recovery rate: η=（Fo×Ho）/（Fi×Hi）×100%. When either party has objections to the flow meter readings, the component-based method is used to calculate the recovery rate: η= /×100%. Where: η – recovery rate; Fi – feed flow rate, Nm3/h; Fo – product flow rate, Nm3/h; Hi – hydrogen content in the feed, mol%; Ho – hydrogen content in the product, mol%; Hd – hydrogen content in the desorbed gas, mol%. Rating

How is the formula for the component method derived?

This post was last edited by huwei19890613 on 2017-2-7 14:08. Recovery rate is one of the key performance indicators for pressure swing adsorption; it is defined as the percentage of the absolute amount of the component to be recovered in the product obtained from the pressure swing adsorption unit, compared to the absolute amount of that same component in the feed gas entering the unit. Method 1: Given the following conditions: ⑴ The flow rate of the feed gas entering the pressure swing adsorption unit (F, Nm3/h); ⑵ The concentration of the component to be recovered in the feed gas (XF, %); ⑶ The flow rate of the product gas obtained from the pressure swing adsorption unit (P, Nm3/h); ⑷ The concentration of the component to be recovered in the product (XP, %). The recovery rate η of the component to be recovered is calculated as: η = P*XP / (F*XF) * 100%. Method 2: Given the following conditions: ⑴ The concentration of the component to be recovered in the feed gas (XF, %); ⑵ The concentration of the component to be recovered in the product (XP, %); ⑶ The concentration of the component to be recovered in the desorbed gas (XW, %). Assuming that the flow rates of the feed gas, product gas, and desorbed gas are respectively F, P, and W. From the material balance, we have: F = P + W. F*XF = P*XP + W*XW. The recovery rate is given by: P*XP/(F*XF) = (F*XF – W*XW)/(F*XF) = (F*XF – F*XW + P*XW)/(F*XF). Therefore, P*XP/(F*XF) = (XF – XW)/XF + P*XW/(F*XF). Subtracting P*XW/(F*XF) from both sides yields: P*XP/(F*XF) – P*XW/(F*XF) = (XF – XW)/XF. Hence, P/F*(XP – XW) = (XF – XW)/XF, and finally P/F = (XF – XW)/(XP – XW). Substituting this value into the original equation gives: η = XP*(XF – XW)/100%. Generally, Method 1 is preferred; the difficulty with Method 2 lies in the fact that the composition of the desorbed gas is unstable, as is the pressure, making sampling and analysis challenging.