What are the design requirements for the minimum load of a hydrocracking heater?
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This hydrocracking unit adopts the post-furnace hydrogen mixing configuration. Currently, the heat exchange efficiency of the unit is good after the major maintenance, and the load on the recycle hydrogen heater is low. There are differences of opinion among the management team regarding further reducing the load on the recycle gas heater; they are concerned that if the heater load is too low, it will not be possible to effectively lower the temperature at the reactor inlet in the event of any abnormalities in the unit. What are the standards for designing the minimum load of a circulating hydrogen heater? Should the temperature difference between the inlet and outlet of the heating furnace be at least 20 degrees? Is this standard accurate? Are there any other requests?
For reheating furnaces with hydrogen mixing in front of the furnace, the temperature difference between the inlet and outlet should be no less than 15 degrees Celsius; this can serve as a reference. Additionally, I could ask the experts from research institutes and design firms for advice