I would appreciate your guidance on some issues affecting the system when the purity of recycled hydrogen decreases and the flow rate of mixed hydrogen increases in a hydrocracking unit
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As the title suggests, in the paraffin oil hydrocracking unit, where centrifuges are used, if the purity of the system’s recycle hydrogen decreases, the flow rate indicated by the hydrogen mixture meter will definitely increase. We all know this is due to the characteristics of the orifice flow meter; it’s just that the displayed value increases. But why does an increase in the hydrogen mixing flow rate caused by a decrease in the purity of the recycled hydrogen also result in a better heat transfer effect by the recycled hydrogen? Some experienced teachers say it’s due to the effect of specific heat. Could everyone please explain this to me? Thank you!
However, under normal circumstances, it shouldn’t be the case that only by adjusting the turbine speed or closing the anti-surge valve to increase the hydrogen mixture ratio that the inlet temperature of the heat exchanger and the inlet temperature of Reactor 1 decrease. Then why does an increase in the hydrogen mixture flow rate caused by a change in purity have the same effect, leading to a decrease in both temperatures as well?