Direct heating electric furnace

Abstract

A steam cracking unit including one or more electric resistance heating tubes electrically connected to a current source to generate heat via electrical resistance heating. Each resistance heating tube may include two or more tube sections. Each tube section may be independently supplied with a current. A controller may be configured to adjust the application of the current to one or more tube sections to control the electrical resistance heating of the one or more resistance heating tubes. In examples, the one or more electric heating tubes may be used as preheating tubes, cracking tubes, or both.

Dependencies are inferred from the claim text.