Issues related to the hydrogen-to-oil ratio in hydrocracking
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The book states that the hydrogen-to-oil ratio refers to the amount of recycled hydrogen required per unit volume of feed oil. So how exactly is it calculated? Is the amount of cold hydrogen used for heat removal in the reactor taken into account?
It shouldn’t count. The hydrogen-to-oil ratio can be understood as the consumption of hydrogen, with cold hydrogen being used for heat extraction. Could that H2 user explain it, please? Thank you!
The hydrogen-to-oil ratio refers to the ratio of the volumetric flow rate of hydrogen under standard conditions to the volumetric flow rate of the feed oil. The hydrogen volume is the product of the circulation gas flow rate and the hydrogen concentration in the circulation gas. The hydrogen-to-oil ratio in the refining reactor = inlet circulation hydrogen flow rate to the refining reactor / volume of fresh feed. The hydrogen-to-oil ratio in the cracking reactor = (inlet circulation hydrogen flow rate to the refining reactor + inlet circulation hydrogen flow rate to the cracking reactor + cold hydrogen flow rate to the refining reactor) / (volume of fresh feed + volume of recycled oil)
Well, count all the hydrogen that enters the reactor.
Cold hydrogen is also included; although it absorbs heat, it takes part in chemical reactions as well, so it is counted as well
What’s said upstairs makes sense; in some devices, the amount of cold hydrogen is greater than the amount of mixed hydrogen that enters the reactor, and that cold hydrogen also participates in the reaction. It definitely plays a role in calculating the hydrogen-to-oil ratio. This is quite comprehensive: Hydrogen-to-oil ratio in the refining reactor = Circulating hydrogen flow rate at the inlet of the refining reactor / Volume of fresh feed; Hydrogen-to-oil ratio in the cracking reactor = (Circulating hydrogen flow rate at the inlet of the refining reactor + Circulating hydrogen flow rate at the inlet of the cracking reactor + Cold hydrogen flow rate at the inlet of the refining reactor) / (Volume of fresh feed + Volume of recycled oil)