Method and system for steamcracking

A system for performing a method of steam cracking, the system comprising:

• one or more steam cracking arrangements, each steam cracking arrangement including:
• one or more fired cracking furnaces;
• one or more quench cooling trains;
• and
• one or more compressors and/or pumps as rotating equipment;
• and
• one or more steam generation arrangements operable in thermal association with the one or more steam crack arrangements;
• wherein:
• the system is configured to pass one or more process gas streams at least through the one or more fired cracking furnaces and the one or more quench cooling trains of the one or more steam cracking arrangements;
• the system is configured to drive the rotating equipment at least partly by electric energy;
• the one or more steam generation arrangements is or are configured to generate at least superheated high pressure steam at a first pressure level of 30 and 175 bar absolute pressure and at a first temperature level and no steam at a higher temperature level than the first temperature level;
• means are provided which are configured to expand the superheated high pressure steam at the first pressure level at least in part adiabatically and isenthalpically to a second pressure level below the first pressure level of at least 20 bar absolute pressure such that its temperature level is lowered to a second temperature level;
• and
• the system is configured to select the first temperature level such that each intermediate temperature level reached at intermediate pressure levels of more than 20 bar during the adiabatic and isenthalpic expansion process is between 5 and 120 K above the dew point of steam at the respective intermediate pressure level during the adiabatic and isenthalpic expansion.