water-to-hydrogen ratio
Thread Content
I would like to ask everyone: is there any specified ratio between hydrogen and water vapor at the inlet of the conversion furnace in natural gas-based hydrogen production units? Some people say that if this ratio exceeds 7, the conversion catalyst will be oxidized; I’m not sure if this is true
Hydrogen: Is water > 7? How can it be oxidized? It should be reduced, hehehe
The conversion catalyst needs to be reduced when it is first put into use, and during this reduction process, the water-to-hydrogen ratio needs to be controlled at around 2 to 7
Is no control needed during normal production?
During normal production, there is a certain water-to-carbon ratio; under such conditions, it represents a reducing environment for the converter, and in this case the water-to-hydrogen ratio is not taken into consideration
In other words, if the amount of steam supplied to the converter is much greater than the amount of hydrogen, there should be no problem, right? I have an experienced technician here who says that too high a steam volume can cause the conversion catalyst to oxidize
View operating conditions: 1. Catalyst reduction process; 2. Normal production. The water-to-hydrogen ratio is required in 1, but it is not taken into account in 2. In case 2, it is difficult to oxidize the catalyst even when the water-to-carbon ratio is high; the function of your catalyst is to produce hydrogen gas, and the purity of this hydrogen gas is over 70% – so how can oxidation occur? Also, in 2, water vapor is always in excess; check the amount of acidic water
An experienced worker said that it mainly happens in the section near the inlet of the conversion furnace; if there is a large amount of steam, oxidation occurs, and a large quantity of hydrogen cannot be generated at the inlet area either
The steam and natural gas feed itself is a reduction process; even nickel catalysts in an oxidized state are active, though their activity is somewhat lower compared to elemental nickel