Method And System For Steam Cracking

Abstract: A method of steam cracking using a steam cracking system including one or more fired radiant sections is provided herein wherein during a steam cracking operation a fuel is combusted with oxidizer gas to heat the one or more fired radiant sections forming a flue gas a process gas is formed using a hydrocarbon feed and process steam and the process gas is passed through one or more coils in the one or more fired radiant sections forming a cracked gas wherein at least a part of the flue gas is cooled in a flue gas heat recovery section wherein at least a part of the cracked gas is cooled in a cracked gas heat recovery section wherein the flue gas heat recovery section and the cracked gas heat recovery section each comprise one or more multistream heat exchangers. The flue gas heat recovery section comprises heat exchange structures which are provided in an amount and a configuration such as to use at least during a part of the steam cracking operation a first proportion of more than 35% of a total amount of heat recovered within the one or more multistream heat exchangers of the flue gas heat recovery section from the flue gas for preheating at least a part of the oxidizer gas and wherein the cracked gas heat recovery section is configured such as to use at least during the same part of the steam cracking operation a second proportion of more than 35% of a total amount of heat recovered within the one or more multistream heat exchangers of the cracked gas heat recovery section for preheating at least a part of the process gas and/or the hydrocarbon feed and/or the process steam. A corresponding system is also part of the present invention.

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