Regarding the issue of the inlet temperature for the hydrogenation reaction
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When the processing volume of the unit is high (around 110% of the designed processing volume), a problem arises: the temperature at the exit of the heating furnace is 360°C, but the temperature at the inlet of the first reactor bed is only 354°C. The temperature rise in each reactor bed is normal; this problem does not occur when the processing volume is low. Has anyone encountered this issue? How can it be explained?
Is it caused by the flow rate?
Is the hydrogen mixing point in front of the furnace or behind it?
Is it because of the high airspeed? It might be possible to reduce the airspeed slightly and see what happens
Is it possible to adjust the amount of circulating hydrogen?
For hydrogen mixing in front of the furnace, as for the space velocity, the hydrogen-to-oil ratio is already at the lower limit of the design value!
I’ve never encountered it, but I personally think it might be due to an excessively high flow rate, which results in excellent turbulent heat transfer and thus heat loss