Hydrogen-to-oil ratio of the hydrogenation unit
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Is the hydrogen-to-oil ratio in the hydrogenation unit hydrogen mixed with the feedstock? Is it a volume ratio? (Standard operating conditions)
The hydrogen feed rate is 214 t/h, with a density of 880 kg/m3; the flow rate of recycled hydrogen is 110,000 Nm3/h, and the purity of this hydrogen is 85%. The amount of fresh hydrogen added is 20,000 Nm3/h, with a purity of 95%. What is the volume ratio of hydrogen to oil? Solution: Hydrogen-to-oil ratio = (110,000*85% + 20,000*95%) / (214/0.88) = 462.6 (v/v). Answer: The volume ratio of hydrogen to oil is 462.6 (v/v).
; The flow rate of recycled hydrogen is 110,000 Nm3/h, with a purity of 85%; the amount of fresh hydrogen added is 20,000 Nm3/h. I’m wondering if the flow rate of recycled hydrogen refers to the flow rate after fresh hydrogen has been added! It is usually the compressor outlet; in other words, 110,000 already includes the 20,000 amount of new hydrogen. So when the hydrogen-to-oil ratio is calculated as well, isn’t there a risk of double counting?