Staggered fired heater manifolds

A catalytic reforming process comprising:

• passing a hydrocarbon stream through a plurality of catalytic reforming reaction zones and a plurality of fired heaters, an effluent from a first reaction zone passing through one of the plurality of fired heaters before entering a second reaction zone, the plurality of fired heaters comprising:
• a radiant section, an inlet manifold, an outlet manifold, at least one heater tube having an inlet and an outlet, the inlet being in fluid communication with the inlet manifold and the outlet being in fluid communication with the outlet manifold, and at least one burner, the inlet manifold of one of the plurality of fired heaters being at a vertical height different from a vertical height of at least one of the other inlet manifolds or at least one of the outlet manifolds.

A catalytic reaction zone comprising:

• a plurality of catalytic reaction zones having a reaction zone inlet and a reaction zone outlet;
• and
• a plurality of fired heaters comprising a radiant section, an inlet manifold, an outlet manifold, at least one heater tube having an inlet and an outlet, the inlet being in fluid communication with the inlet manifold and the outlet being in fluid communication with the outlet manifold, and at least one burner, the inlet manifold of at least one fired heater being in fluid communication with the reaction zone outlet of the preceding catalytic reaction zone and the outlet manifold of the at least one fired heater being in fluid communication with the inlet manifold of the next catalytic reaction zone, the inlet manifold of one of the plurality of fired heaters being at a vertical height different from a vertical height of at least one of the other inlet manifolds or at least one of the outlet manifolds.