How is hydrogen stored in the hydrogenation/hydrogenation-like processes?
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This post was last edited by jacques0920 on 2016-3-18 at 16:50. Hello everyone, I have limited experience in hydrogenation processes, and I would like to ask whether temporary hydrogen storage tanks are typically included in the process flow for hydrogenation/operations involving hydrogen How is excess hydrogen generally handled? Thank you.
Reforming units generally do not have hydrogen storage tanks; the hydrogen is supplied directly for use by other devices, with any excess hydrogen being burned as fuel gas
No hydrogen storage tank is used; as much hydrogen is drawn as needed, so there is no such thing as excess hydrogen； The waste hydrogen in the circulating hydrogen is discharged to the flare network, while the hydrogen in the light fraction gas is sent outside the facility for recycling.
There will be no excess consumption in the reaction; as much reactant is used as is needed. The product with a low purity is sent to other devices, while waste hydrogen is vented through flares, and no storage tanks are installed
The load for normal hydrogen production is adjusted according to the hydrogen demand, with efforts made to maintain balance; any excess hydrogen must be vented through a flare, which is why the hydrogen production facility needs to keep the pressure in the hydrogen system stable. We have a polypropylene production facility that has high requirements regarding the quality of hydrogen. We have set up 10 hydrogen cylinder stations; their purpose is to supply hydrogen to the polypropylene production process in case there are problems with the hydrogen produced, and they can also be used when there is no source of hydrogen available during hydrogen production. I hope this information is helpful to you.
What is the role of hydrogen in the polypropylene plant? What is the typical capacity of hydrogen gas cylinders? What is the typical supply volume? Thank you.
The waste hydrogen from the system is directly discharged into the flare; the hydrogen is basically sourced from hydrogen production processes, and it is pressurized – there are no separate storage measures, and all areas where hydrogen is present come into contact with it~~~
Is it for security reasons that it isn’t stored separately? What if there is a temporary interruption?
A hydrogen storage tank is like an **with an unpredictable timing – it’s too dangerous to have it installed in a device
In typical hydrogenation units, the minimum hydrogen consumption for processing diesel and kerosene is 3,000 NM3/h; for processes such as hydrocracking and hydrotreating of residue oil, this figure exceeds 20,000 NM3/h. With such large amounts of hydrogen required, if there is a disruption in hydrogen supply, the various hydrogenation units have to reduce their operation volume and switch to circulation mode. There is no need for hydrogen storage. The demand for polypropylene is very low – for the T30S grade, it’s less than 100 NM3/h. A storage tank with a capacity of 30 NM3, when pressurized to 100 MPA, can supply enough hydrogen to cover most of the day’s needs.
No storage; a temporary increase in pressure