Study of the anti-coking properties of a new centrifugally cast alloy for ethylene cracker furnaces

Walters, Elliot Alexander (2020). Study of the anti-coking properties of a new centrifugally cast alloy for ethylene cracker furnaces. University of Birmingham. Ph.D.

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Abstract

Plastic production relies on the formation of ethylene through steam cracking of hydrocarbons at high temperatures. Coking is one of the biggest issues in the ethylene cracking process, resulting in reduced production efficiency and lifespan of the pipes used. This work was undertaken to assess Optim-Al, a new, aluminium containing alloy, as an improvement over the currently used alloy.
The focus of the research was on the ability of Optim-Al to form a thin, protective aluminium oxide layer to inhibit catalytic coking, and specifically to provide greater protection than the alloy currently used. Optim-Al was found to form a continuous aluminium oxide layer after oxidation in air and demonstrated greater coverage and adhesion of the oxide even under more extreme conditions. Optim-Al was found to be an improvement over alloys currently used in the industry. Spalling of the surface oxide layer was found to concentrate around machining marks on the substrate surfaces, and a smoother surface to be oxidised should lead to improved coverage of oxide layer on both alloys in service, resulting in greater retardation of catalytic coking.

Type of Work:

Thesis (Doctorates > Ph.D.)

Award Type:

Doctorates > Ph.D.

Supervisor(s):