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1.
公开(公告)号:US20200377801A1
公开(公告)日:2020-12-03
申请号:US16888390
申请日:2020-05-29
发明人: Bruce Indurain Y Urricelqui , Sylvain Lalot , Mathieu Couvrat , François Beaubert , David Uystepruyst
摘要: A tube for a steam cracking furnace comprising: at least one downstream tubular segment of circular section having a main diameter; at least one twisted tubular segment having a length less than a quarter of the length of the tube, and comprising: a central part with an elliptical or lobed section, having a helical pitch between one times and ten times the main diameter, and an aspect ratio of the elliptical or lobed section between 0.5 and 0.8; an upstream transition part establishing a geometric transition between the central part and a tubular segment of circular section; a downstream transition part establishing a geometric transition between the central part and the downstream tubular segment, with a fluid being intended to flow from the upstream transition part to the downstream transition part.
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2.
公开(公告)号:US11542440B2
公开(公告)日:2023-01-03
申请号:US16888390
申请日:2020-05-29
发明人: Bruce Indurain Y Urricelqui , Sylvain Lalot , Mathieu Couvrat , François Beaubert , David Uystepruyst
摘要: A tube for a steam cracking furnace comprising: at least one downstream tubular segment of circular section having a main diameter; at least one twisted tubular segment having a length less than a quarter of the length of the tube, and comprising: a central part with an elliptical or lobed section, having a helical pitch between one times and ten times the main diameter, and an aspect ratio of the elliptical or lobed section between 0.5 and 0.8; an upstream transition part establishing a geometric transition between the central part and a tubular segment of circular section; a downstream transition part establishing a geometric transition between the central part and the downstream tubular segment, with a fluid being intended to flow from the upstream transition part to the downstream transition part.
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公开(公告)号:US11408057B2
公开(公告)日:2022-08-09
申请号:US16435265
申请日:2019-06-07
申请人: Manoir Pitres , Université de Rouen Normandie , Centre National de la Recherche Scientifique , Institut National des Sciences Appliquées Rouen Normandie
摘要: An austenitic alloy based on nickel, chromium and iron, and having a high aluminum content, intended for use at a given operating temperature (Ts) between 900° C. and 1200° C., the alloy comprising the following elements, in weight percent: chromium between 20% and 32%, nickel between 30% and 60%, aluminum between 3.5% and 6%, carbon between 0.4% and 0.7%, titanium between 0.05% and 0.3%, niobium and/or tantalum between 0.6% and 2%, an element, composed of at least one rare earth and/or hafnium, between 0.002% and 0.1%, silicon between 0 and 0.5%, manganese between 0 and 0.5%, tungsten between 0 and 2%, and iron as the balance of the elements in the alloy. The alloy has less than 1% by volume of an intermetallic B2-NiAl phase and less than 1% by volume of an alpha prime phase rich in chromium, after subjecting the alloy to an operating temperature (Ts).
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