Please give me some guidance, seniors
Thread Content
In hydrogen production plants, why is water vapor required for the reduction of catalysts in the medium-pressure reactor? What is the role of water vapor? Does water vapor participate in the reaction, or not?
CH4+H2O=CO+3H2 CO+H2O=CO2+H2
The question asked by the original poster is not the same as the one that was answered! ! Was it the original poster who asked the wrong question, or was the answer wrong? The original poster seems to agree~!
I would also appreciate some guidance from a senior; actually, I don’t quite understand it either
You asked about the reduction of catalysts during operation, as well as the role of water vapor: one of its functions is to increase the gas flow rate, ensuring that the substance to be reduced is distributed evenly throughout each furnace tube. Secondly, it prevents the partial cracking of hydrocarbons in the reducing medium from leading to carbon deposition. Thirdly, when the temperature rises in the medium-temperature converter, the presence of water vapor helps to prevent excessive reduction of the catalyst in that unit. After normal operation begins, it is necessary to control the water vapor ratio in the medium-temperature reactor; water vapor is involved in the reaction CO + H2O = CO2 + H2
How can water vapor prevent the excessive reduction of medium-temperature catalysts?
The active component of medium-temperature catalysts is iron tetraoxide, but it is in the form of iron oxide trioxide at the time of manufacture; without water vapor, it would be excessively reduced to elemental iron, so a certain ratio of water to hydrogen is maintained.