Optimal Selection of Delayed Coke Drum Materials Based on ASME Section II Material Property Data.

摘要

A remarkable contribution to the oil refining process has been made by introducing delayed coking process. The delayed coking enabled thermal cracking of heavy oil residue into useful lighter oil products and coke as a useful by-product. The achievement of the delayed coking has been made at the expense of increasing oil processing temperatures. Because the process is cyclic, the high cyclic operating temperatures combined with cyclic mechanical loads significantly reduce the operating life of the delayed coke drums. The objective of this thesis is to assess alternative materials for the delayed coke drum applications based on material property data provided in ASME Boiler & Pressure Vessel Code, Section II. The materials were compared based on their metallurgical and mechanical properties and the stress level in the coke drum shell obtained from finite element simulations for two critical operating scenarios, i.e. heating up stage and quenching stage. Among the materials studied, SA-302-C as a base material cladded with the nickel alloy N06625 is a proposed material pair for the delayed coke drum application.