How is the H\N ratio calculated?

The permeate gas recovered from hydrogen production amounts to 1600 NM3/H, with a hydrogen concentration of 60% – is that really that low? The membrane tubes must be damaged!! The amount of air used is related to the level of residual methane present (not in a significant way); based on our load requirements, an additional 5500–5600 NM3/H would be appropriate. It’s important to pay attention to the H/N ratio of the fresh gas as well as that of the recycled gas (there are both online and manual analysis methods available). A slight adjustment should suffice. This post was last edited by zjm3116 on 2007-12-27 at 15:07

Our hydrogen goes through a two-stage purification process; pure hydrogen with a purity of over 98% is sent to the hydrogen peroxide production process. The exhaust gas from the second stage of separation has only a purity of 60%.

According to the poster, the actual hydrogen recovery amount is around 960 cubic meters, which is 1600*60%. It’s roughly the same as the amount of hydrogen reversion in our production process. According to our standard operating procedures*, the converted load (excluding gas)*(1.4~1.45) = the amount of air supplied to the secondary furnace. Based on your load, it’s roughly 5600–5800. We maintain our synthetic hydrogen-to-nitrogen ratio at around 2.0–2.5, and it remains stable. The synthetic hydrogen-to-nitrogen ratio fluctuates greatly; are the amount of synthetic off-gas produced and the amount of hydrogen returned by the hydrogen recovery system stable? Especially regarding the hydrogen return amount, it should be easier to stabilize it within an appropriate range, and then use the amount of air used for conversion to make fine adjustments. Personal opinion, for reference only. If there are any issues, please understand.