Gaseous Pretreatment of High-Alloy Steels Used in Ethylene Furnaces: Pretreatment of Incoloy 800

Autor:	Ta-Chi Luan, Lyle F. Albright, Roger E. Eckert
Rok vydání:	2003
Předmět:	Ethylene Materials science Hydrogen General Chemical Engineering Diffusion Alloy Metallurgy chemistry.chemical_element General Chemistry engineering.material Industrial and Manufacturing Engineering chemistry.chemical_compound chemistry engineering Pyrolysis Incoloy
Zdroj:	Industrial & Engineering Chemistry Research. 42:4741-4747
ISSN:	1520-5045 0888-5885
DOI:	10.1021/ie030422s
Popis:	Gaseous pretreatments at high temperatures of high-alloy steels used in the coils of ethylene coils sometimes result in much improved pyrolysis operation. Recently, Nova Chemical Co. has reported pretreatments with hydrogen/steam mixtures that reduce the need to decoke from about 30-40 days to up to 515 days in both the coil and the accompanying transferline exchanger. Many pretreatments cause significant diffusion of Cr and Mn to the surface and of Fe and Ni to layers below the surface. The phenomena occurring during pretreatments and differences in resulting surface changes are still not well understood. The results obtained when Incoloy 800 coupons were pretreated were compared over a wide range of pretreatments. Temperature, time of pretreatment, and gas used all have important effects on surface compositions and suggest even more improved coils can be developed.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::f9cac9ddfda2b2343adf06a8bd3ece26 https://doi.org/10.1021/ie030422s Zobrazit plný text záznamu