Low CO2 emission and hydrogen import cracking heaters for olefin production

A pyrolysis and system for converting a hydrocarbon feed to produce olefins, the system comprising:

• a pyrolysis heater comprising a convection heating zone and a radiant heating zone;
• a first preheat zone of the convection heating zone configured for preheating the hydrocarbon feed and recovering a preheated hydrocarbon stream;
• a secondary transferline exchanger configured for heating the preheated hydrocarbon stream and recovering a heated hydrocarbon stream;
• a second preheat zone of the convection heating zone configured for vaporizing a portion of the heated hydrocarbon stream and recovering a cracking feedstream comprising vaporous hydrocarbons;
• one or more coils in the radiant heating zone configured for cracking in the cracking feedstream and recovering a cracked hydrocarbon product comprising olefins;
• a primary transferline exchanger configured for quenching the cracked hydrocarbon product and recovering a partially cooled cracked hydrocarbon product;
• and
• a feed line for directing the partially cooled cracked hydrocarbon product to the secondary transferline exchanger for cooling in indirect heat exchange with the preheated hydrocarbon stream, recovering a cooled hydrocarbon product stream comprising the olefins.