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01392 A LOW COKING AND CARBURIZATION RESISTANT COATING FOR ETHYLENE PYROLYSIS FURNACES

Picture for 01392 A LOW COKING AND CARBURIZATION
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Product Number: 51300-01392-SG
ISBN: 01392 2001 CP
Author: Ted Redmond, Dr. Yan Chen, Arthur Bailey, John Page
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The key to reducing coke build up in ethylene pyrolysis reactors is to mitigate the formation of catalytic coke. Limited anti-coking properties are provided by the chromium oxide scale formed on the surface of uncoated ethylene reactors due to the instability of this oxide. Successful anti-coking coatings have been engineered to provide anti-coking benefits beyond that provided by the high temperature alloys from which the reactor is normally made. This is done by creating a continuous and inert surface and supporting it with an underlying coating system which continuously regenerates the surface and thereby prevents coking and carburization. The desired characteristics of an ethylene furnace anti-coking coating system are described along with results of testing to confirm the performance of one such coating system. This includes an examination of coking resistance, carburization resistance, high temperature oxidation resistance and resistance to feedstock contaminants such as sulfur. Performance data from actual commercial ethylene furnaces that have been coated is drawn upon to demonstrate that the mitigation of catalytic coke formation results in higher plant production and corresponding significant economic benefits to ethylene producers. This paper discusses performance results and economic benefits in a broad variety of commercial ethylene furnace designs as well as in furnaces cracking a variety of feedstocks including Ethane, Propane, Butane and Naphtha.
The key to reducing coke build up in ethylene pyrolysis reactors is to mitigate the formation of catalytic coke. Limited anti-coking properties are provided by the chromium oxide scale formed on the surface of uncoated ethylene reactors due to the instability of this oxide. Successful anti-coking coatings have been engineered to provide anti-coking benefits beyond that provided by the high temperature alloys from which the reactor is normally made. This is done by creating a continuous and inert surface and supporting it with an underlying coating system which continuously regenerates the surface and thereby prevents coking and carburization. The desired characteristics of an ethylene furnace anti-coking coating system are described along with results of testing to confirm the performance of one such coating system. This includes an examination of coking resistance, carburization resistance, high temperature oxidation resistance and resistance to feedstock contaminants such as sulfur. Performance data from actual commercial ethylene furnaces that have been coated is drawn upon to demonstrate that the mitigation of catalytic coke formation results in higher plant production and corresponding significant economic benefits to ethylene producers. This paper discusses performance results and economic benefits in a broad variety of commercial ethylene furnace designs as well as in furnaces cracking a variety of feedstocks including Ethane, Propane, Butane and Naphtha.
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02386 A NEW CARBURIZATION RESISTANT ALLOY FOR ETHYLENE PYROLYSIS FURNACE TUBES

Product Number: 51300-02386-SG
ISBN: 02386 2002 CP
Author: Y.Nishiyama, H.Semba, K.Ogawa, Y.Yamadera, Y.Sawaragi, and S.Kinomura
Publication Date: 2002
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A new wrought alloy has been developed for use as furnace tubes in ethylene pyrolysis plants. This alloy has an excellent carburization resistance due to uniform formation of protective Al2O3 oxide scale on the metal surface. Laboratory corrosion tests have been carried out to evaluate carburization resistance of the developed alloy.
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Product Number: 51300-01389-SG
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01388 Effect of ID Surface Modification on Carburization of Ethylene Furnace Tubes

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