Quenching system and process for a quenching system for cooling cracked gas from a cracked gas furnace

A quenching system for cooling cracked gas from a cracked gas furnace using different raw materials, the quenching system comprising:

• a cracked gas furnace;
• a primary quench exchanger;
• a secondary quench exchanger, the primary quench exchanger and the secondary quench exchanger being connected in series, wherein a transfer line exchanger, for a cooling medium comprised of a gas mixture and steam, is arranged and configured as a secondary quench exchanger;
• a gas transfer line, wherein the transfer line exchanger is connected in series to the primary quench exchanger via the gas transfer line;
• a feed line conveying the cooling medium, comprised of a gas mixture and steam, wherein the feed line is arranged at the transfer line exchanger, at a lower part of the transfer line exchanger, with the transfer line exchanger oriented vertically, in front of an outlet header of the transfer line exchanger;
• a return line connecting the transfer line exchanger to the cracked gas furnace for returning cooling medium preheated in the transfer line exchanger to the cracked gas furnace;
• a pipeline of the transfer line exchanger for forwarding cracked gas that has been cooled down to temperatures ranging from 450° C. to 300° C. for further processing;
• and
• a compensator, which is provided at an upper end of the transfer line exchanger, with the transfer line exchanger oriented vertically, behind a cracked gas inlet header of the transfer line exchanger.