Method for upgrading a hydrocarbon feed

A method for upgrading a hydrocarbon feed in a pyrolysis furnace, the method comprising:

• dividing the pyrolysis furnace into a first thermal zone and a second thermal zone by separating the first thermal zone and the second thermal zone by at least one refractory wall;
• operating the pyrolysis furnace in a first mode, the first mode comprising:
• decoking a first coil of the pyrolysis furnace by feeding a first steam stream to a first coil, the first steam stream flowing through the first coil in a first direction from the first thermal zone to the second thermal zone;
• forming a first hydrocarbon/steam stream by mixing a first hydrocarbon feed with the first steam stream from the first coil;
• and
• upgrading the first hydrocarbon feed by feeding the first hydrocarbon/steam stream to a second coil, the first hydrocarbon/steam stream flowing through the second coil in a second direction from the second thermal zone to the first thermal zone, the second direction opposite the first direction;
• operating the pyrolysis furnace in a second mode, the second mode comprising:
• decoking the second coil of the pyrolysis furnace by feeding a second steam stream to the second coil, the second steam stream flowing through the second coil in the second direction;
• forming a second hydrocarbon/steam stream by mixing a second hydrocarbon feed with the second steam stream from the second coil;
• and
• upgrading the second hydrocarbon feed by feeding the second hydrocarbon/steam stream to the first coil, the second hydrocarbon/steam stream flowing through the first coil in the first direction,
• alternating between the first mode and the second mode in a series of repeating cycles,
• wherein, upgrading the first hydrocarbon feed in the second coil is carried out simultaneously with decoking the first coil, and
• wherein, upgrading the second hydrocarbon feed in the first coil is carried out simultaneously with decoking the second coil.