Relationship between circulating hydrogen volume and reaction temperature in hydrogenation units
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In hydrogenation units, with all other conditions remaining unchanged, an increase in reaction temperature leads to a greater degree of reaction, which results in higher hydrogen consumption. Yet the amount of hydrogen circulated also increases. Could it be that the amount of hydrogen sulfide and ammonia produced is greater than the amount of hydrogen consumed?
There are many factors that can lead to an increase in the amount of recycled hydrogen: in your case, it is likely due to a high reaction temperature, an increase in depth, an abundance of by-products, and a decrease in the purity of the recycled hydrogen. Have you analyzed the purity of the recycled hydrogen? Top up with fresh hydrogen in a timely manner, discharge some of the recycled hydrogen to maintain its purity
No matter how it is adjusted, the concentration of recycled hydrogen must be maintained. Additionally, the hotspot temperature rises as the catalyst’s activity decreases; raising the hotspot temperature is considered only in the later stages of catalyst use.