Regarding the start-up of hydrogen production
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In a natural gas-based hydrogen production facility, the process starts with the circulation of the hydrodesulfurization system and the shift conversion system; thereafter, each of these systems is heated. Once the required conditions are reached, the two systems are connected together to allow further heating, until the conditions for feeding material in are satisfied. What I want to ask is why they need to loop separately; can’t there be one large loop that connects them all?
If your hydrogenation catalyst requires pre-sulfurization, a separate cycle can be carried out; if pre-sulfurization is not necessary, one cycle is sufficient.
When natural gas is put into operation and undergoes conversion, carbon monoxide and carbon dioxide are produced; if it enters the hydrogenation reactor, it may trigger methanation reactions. Only two cycles are allowed, and a larger cycle can be initiated only after the medium-temperature gas analysis shows satisfactory results:lol:lol
What Z said is also correct; a single loop can be used to first isolate the hydrogenation reactor, and this can also be done in series
There should be no material feeding during circulation; the heating medium is nitrogen, so how could carbon monoxide and carbon dioxide be produced?
Then, what do you use to reduce the catalyst?
What conditions are required for each to reach its respective temperature rise? During the nitrogen circulation heating phase, a large-scale circulation can be used
There should be no material feeding during the cycling process; the heating medium is nitrogen, so how could carbon monoxide and carbon dioxide be produced?
Are you referring to the reduction of the conversion catalyst? When the nitrogen temperature rises to the feeding condition, wouldn’t the hydrogen generated after feeding naturally reduce the conversion catalyst?
At the beginning, the amount of hydrogen produced is very small; you need to operate in a large circulation mode. The conditions for using medium-temperature gas in the conversion furnace for combustion are not yet met. If you want to continue operating in large circulation mode, then shut down the hydrogenation reactor