Hydrogenation, action of hydrogen gas
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Hydrogen is added at the inlet of the first reactor; what is the function of this hydrogen, and what is the principle behind adding cooled hydrogen to the second reactor?
There are many hydrogenation devices, with different process principles and procedures. It would be best if you attached a flowchart of this reaction unit so that its function can be understood accurately.
What might be at the reactor inlet is a device for measuring the pressure drop across the bed; the pipeline should be relatively thin； Cold hydrogen is used to control the bed temperature rise.
The hydrogen pipeline opposite the inlet should be quite thin; it is generally used for purging with hydrogen, and for purging instruments during shutdown periods. The recycled cold hydrogen comes from the inlet of the self-circulating hydrogen pump; it is injected into the catalyst bed without any heat exchange or heating, in order to control the temperature of the reactor bed
Hydrogen supplied to the second reactor determines the hydrogen-to-oil ratio in that reactor; cold hydrogen from the second reactor is used to control the temperature rise in the bed
Our unit is equipped with a detector to measure the pressure difference across the bed layers at the first and second reactors; hydrogen from the bed layers of the first and second reactors is used to control the temperature. The first reactor is usually not operated, while the second reactor is often in operation
Contrary to the pipes at the inlet, those that are thinner are generally used for instrument pressure lead lines and hydrogen purging. Injecting cold hydrogen is used to control the bed temperature rise and prevent excessive temperature increases.
The thin white hydrogen steel pipes located opposite the inlet are likely used for purging hydrogen; they are also present at the bottom of the reactor as well as in the middle layer of the bed, and they are used to measure the pressure difference across the bed. The total pressure drop is generally not more than 0.5 MPa.