Abstract: This paper introduces new models for the furnace structure and the layout of piping in front of the cracking furnace in an ethylene plant. Combined with the design experience and practical examples of the furnace tubes of a 200 kt/a furnace in an ethylene plant in China, this paper elaborates on the design process for platform arrangement and the redistribution of valve group placement from a structural and functional perspective. An innovative scheme is presented for the piping design of cracking gas valve and the span of pipe gallery, and the feasibility of this scheme is demonstrated from the perspective of stress analysis. Additionally, it explores the potential to reduce the footprint of the entire cracking furnace by reducing the span of pipe gallery from the perspective of spatial layout.

Key words: ethylene cracking furnace, cracking gas valve, horizontal and vertical layout