EP2298850A1 - Tuyau profilé pour le craquage thermique d'hydrocarbure - Google Patents

Tuyau profilé pour le craquage thermique d'hydrocarbure Download PDF

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Publication number
EP2298850A1
EP2298850A1 EP10012045A EP10012045A EP2298850A1 EP 2298850 A1 EP2298850 A1 EP 2298850A1 EP 10012045 A EP10012045 A EP 10012045A EP 10012045 A EP10012045 A EP 10012045A EP 2298850 A1 EP2298850 A1 EP 2298850A1
Authority
EP
European Patent Office
Prior art keywords
finned tube
ribs
tube according
profile
tube
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP10012045A
Other languages
German (de)
English (en)
Inventor
Peter WÖLPERT
Benno Ganser
Dietlinde Jackobi
Rolf Kirchheiner
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Schmidt and Clemens GmbH and Co KG
Original Assignee
Schmidt and Clemens GmbH and Co KG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Schmidt and Clemens GmbH and Co KG filed Critical Schmidt and Clemens GmbH and Co KG
Publication of EP2298850A1 publication Critical patent/EP2298850A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10G—CRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
    • C10G9/00—Thermal non-catalytic cracking, in the absence of hydrogen, of hydrocarbon oils
    • C10G9/14—Thermal non-catalytic cracking, in the absence of hydrogen, of hydrocarbon oils in pipes or coils with or without auxiliary means, e.g. digesters, soaking drums, expansion means
    • C10G9/18—Apparatus
    • C10G9/20—Tube furnaces
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10G—CRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
    • C10G9/00—Thermal non-catalytic cracking, in the absence of hydrogen, of hydrocarbon oils
    • C10G9/24—Thermal non-catalytic cracking, in the absence of hydrogen, of hydrocarbon oils by heating with electrical means
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C19/00—Alloys based on nickel or cobalt
    • C22C19/03—Alloys based on nickel or cobalt based on nickel
    • C22C19/05—Alloys based on nickel or cobalt based on nickel with chromium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/48—Ferrous alloys, e.g. steel alloys containing chromium with nickel with niobium or tantalum
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F1/00—Tubular elements; Assemblies of tubular elements
    • F28F1/10—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses
    • F28F1/40—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only inside the tubular element
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10G—CRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
    • C10G2300/00—Aspects relating to hydrocarbon processing covered by groups C10G1/00 - C10G99/00
    • C10G2300/80—Additives
    • C10G2300/805—Water
    • C10G2300/807—Steam

Definitions

  • the invention relates to a method and a finned tube for the thermal cracking of hydrocarbons in the presence of steam, in which the feed mixture is passed through externally heated tubes with helical inner fins.
  • tube furnaces For the high-temperature pyrolysis of hydrocarbons (petroleum derivatives), tube furnaces have proven in which a hydrocarbon / steam mixture at temperatures above 750 ° C by rows of single or meandering tubes (cracking tubes) made of heat-resistant chromium-nickel steel alloys with high oxidation and scale resistance and high carburization resistance.
  • the coils are made of vertically extending straight pipe sections, which are connected to each other via U-shaped pipe bend or arranged parallel to each other; They are usually heated by means of sidewall and partly also with the aid of bottom burners and therefore have a so-called sun side facing the burners and a 90 ° offset, ie in the direction of the rows of tubes, the so-called shadow side. TMT) partly over 1000 ° C.
  • the lifetime of the cracking pipes depends very much on the creep resistance and the Aufkohiungsdauerurcheltkelt and the coking rate of the pipe material.
  • Decisive for the rate of coking, that is for the growth of a layer of carbon deposits (pyrolysis) on the pipe inner wall are, in addition to the type of hydrocarbons used, the gap gas temperature in the inner wall and the so-called CrackMrfe, behind the influence of the system pressure and the residence time in the pipe system hides on the ⁇ thylenausbeute.
  • the gap sharpness is determined by the mean outlet temperature of the cracked gases (eg 850 ° C). set.
  • the chromium-nickel steel alloys used as pipe material with 0.4% carbon over 25% chromium and over 20% nickel, for example 35% chromium, 45% nickel and optionally 1% niobium have a high carburization resistance, the carbon diffuses Defects of the oxide layer in the pipe wall and leads there to a considerable carburizing, which can go up to carbon contents of 1% to 3% in wall depths of 0.5 to 3 mm. Associated with this is a significant embrittlement of the pipe material with the risk of cracking during thermal cycling especially when starting and stopping the furnace.
  • centrifugally cast tubes can only be produced with a cylindrical wall, special shaping processes are required, for example an electrolytically removing machining or a shaping welding process, in order to produce internal finned tubes.
  • the invention is based on the problem of improving the efficiency of the thermal cracking of hydrocarbons in tubular ovens with externally heated tubes with helical inner ribs.
  • the solution to this problem consists in a method in which in the immediate vicinity of the ribs preferably a centrifugally cast tube generates a swirl flow and is transferred with increasing radial distance from the ribs in a core zone predominantly axial flow.
  • the transition between the outer zone with the swirl flow and the core zone with the predominantly axial flow takes place gradually, for example parabolically.
  • the swirl flow absorbs the swirling off at the rib flanks, so that there is no local recycling of the swirls in the manner of a self-contained circular flow into the rib valleys.
  • the average residence time is lower than in the smooth tube and also more homogeneous over the cross section (see. Fig. 7 ). This is confirmed by the higher total speed in the profile tube with swirl (profile 3) compared to the tube with straight ribs (profile 2). This is particularly ensured when the swirl flow in the region of the ribs or the ribs at an angle of 20 "to 40 °, for example, 30 °, preferably 25 ° to 32.5 ° relative to the tube axis.
  • a layer of laminar flow characteristic of turbulent flows forms with greatly reduced heat transfer. It leads to increased formation of pyrolysis coke with also poor thermal conductivity. Both layers together require a higher heat input or a higher burner output. This increases the tube wall temperature (TMT) and consequently shortens the life.
  • TMT tube wall temperature
  • the invention avoids this by the fact that the inner circumference of the profile by a maximum of 5%, for example 4% or 3.5%, based on the circumference of the Rippentäler touching enveloping circle.
  • the inner circumference can also be up to 2% smaller than the outer circle.
  • the relative profile perimeter is at most 1.05 to 0.98% of the enveloping circle perimeter. Accordingly, the surface difference of the profile tube according to the invention, ie its unwound inner surface, based on a smooth tube with the outer circle diameter at most + 5% to - 2% or 1.05 to 0.98 times the smooth tube surface.
  • the tube profile according to the invention allows a lower specific tube weight (kg / m) compared to a finned tube, in which the inner circumference of the profile is at least 10% larger than the circumference of the enveloping circle. This shows a comparison of two pipes with the same hydraulic diameter and accordingly the same pressure loss and the same thermal performance result.
  • a further advantage of the profile circumference (relative profile circumference) according to the invention which is based on the enveloping circle circumference, consists in a more rapid heating of the feed gas at a reduced tube wall temperature.
  • the swirl flow according to the invention considerably reduces the laminar layer; it is also connected to a pipe center directed velocity vector, which reduces the residence time of cracking radicals or fission products on the hot tube wall and their chemical and catalytic conversion to pyrolysis coke.
  • the not inconsiderable in inner profile tubes with high ribs temperature differences between Rippentälem and ribs are compensated by the swirl flow according to the invention. This increases the time interval between two necessary decoking.
  • a not insignificant temperature difference results between the ridge crests and the bottom of the ridge valleys.
  • the residence time of the fouling-prone fission products is shorter in the case of spiral-shaped internal fins; In individual cases, this depends on the nature of the ribs.
  • the curve clearly shows that the higher peripheral speed of the profile 6 is consumed with 4.8 mm high ribs within the ridge valleys, while the peripheral speed of the inventive profile with a rib height of only 2 mm penetrates into the core of the flow. Although the peripheral speed of the profile 4 with only 3 ribs is approximately as high, but causes no spiral acceleration of the core flow.
  • the profile of the invention causes according to the curve in the diagram of Fig. 2 a spiral acceleration in the Rippentälern (upper curve branch), which covers wide areas of the pipe cross-section and thus causes a homogenization of the temperature in the pipe.
  • the lower peripheral speed at the rib caps also ensures that there is no turbulence and backflow.
  • Fig. 3 three test tubes are shown with their data in cross section, including the profile of the invention 3.
  • the diagrams show the temperature profile over the pipe radius (radius) on the shadow and the sunny side again.
  • a comparison of the diagrams shows the lower temperature difference between the pipe wall and center and the lower gas temperature at the pipe wall in the profile 3 according to the invention.
  • the swirl flow according to the invention ensures that the fluctuation of the inner wall temperature over the circumference of the pipe, ie between the sun and shade side is below 12 ° C, although the usually arranged in parallel rows of pipe coils of a tube furnace with the help of sowandbrennem heated only on opposite sides or with combustion gases be acted upon and the tubes thus each have a Brennem facing sun side and a 90 ° offset to the dark side.
  • the mean tube wall temperature, ie the difference in the tube wall temperature between the sun and shadow sides leads to internal stresses and therefore determines the service life of the tubes. So the results from the diagram of the Fig.
  • a particularly favorable temperature distribution arises when the isotherms of the tube inner wall to the core of the flow are spiral.
  • a more uniform distribution of the temperature across the cross section results in particular if the peripheral speed builds up within 2 to 3 m and then remains constant over the entire tube length.
  • the process according to the invention should be operated with a view to a high Olefinausbeute with comparatively short tube length so that the homogeneity factor of the temperature above the cross section and based on the hydraulic diameter homogeneity factor of the temperature in relation to the homogeneity factor of a smooth tube (H G ⁇ ) is greater than 1.
  • the flow pattern according to the invention of core and spin flow can be achieved with a finned tube in which the flank angle of each of the Length of a piece of pipe continuous ribs, that is, the outer angle between the rib edges and the radius of the tube 16 ° to 25 °, preferably 19 ° to 21 °.
  • Such a flank angle ensures, in particular in conjunction with a rib inclination of 20 ° to 40 °, for example 22.5 ° to 32.5 °, that in the Rippentälem not a more or less self-contained, behind the rib flanks in the Rippentäler returning vortex flow results in the Rippentälem to the emergence of unwanted "twisters", that is, of closed vortex pigtails leads. Rather, the resulting in the Rippentälem vortices detach from the rib edges and are absorbed by the swirl flow. The swirl energy induced by the ribs accelerates the gas particles and leads to a higher overall velocity. This leads to a reduction and homogenization of the tube wall temperature and to a homogenization of the temperature and the residence time over the pipe cross-section.
  • the ribs and the ridge valleys located between the ribs can be mirror-symmetrical in cross-section and adjoin one another or form a wavy line, each with the same radii of curvature.
  • the flank angle then results between the tangents of the two radii of curvature at the point of contact and the radius of the tube.
  • the ribs are relatively flat; Rib height and flank angle are coordinated so that the hydraulic diameter of the profile of the ratio 4 x free cross section / profile circumference is equal to or greater than the inner circle of the profile. The hydraulic diameter is therefore in the inner third of the profile height.
  • the rib height and the number of ribs increase with increasing diameter so that the swirl flow is maintained in the direction and strength required for the action of the profile.
  • the tube wall between the individual ribs remains essentially unchanged, so that the rib valleys lie on a common circle, which corresponds to the inner circumference of the centrifugally cast tube.
  • the ratio of the quotients of the heat transfer coefficients Q R / Q 0 to the quotient of the pressure losses ⁇ P R / ⁇ P 0 in the water test using the laws of similarity and using the mediated for a naphtha / steam mixture Reynolds numbers, preferably 1.4 to 1.5, where R denotes a finned tube and 0 denotes a smooth tube.
  • the finned tube according to the invention gives in the water test a higher by a factor of 2.56 heat transfer (Q R ) compared to the plain tube with only a factor of 1.76 increased pressure drop ( ⁇ P R ).
  • Fig. 7 are a tube with a smooth inner wall (smooth tube) faced three different profile tubes, including a tube according to the invention with 8 ribs with a slope of 30 °.
  • a tube according to the invention with 8 ribs with a slope of 30 °.
  • the hydraulic diameter, the axial velocity, the residence time and the pressure loss are indicated.
  • Output data were the flow rates of a 38 mm internal diameter smooth tube in use, which is identical to the hydraulic diameter. These data were converted to warm water according to the similarity laws (same Reynolds numbers) and based on the experiments (see ratio of heat transfer and pressure drop ratios for tests with water and the related homogeneity factor in the calculation with gases).
  • the heat from the pipe wall is introduced into the flow and thus more evenly distributed than in a normal undirected turbulent flow (smooth tube, profiles 1 and 2).
  • the spiraling flow distributes the particles more evenly across the cross section while the acceleration at the flanks reduces the average residence time.
  • the higher pressure loss of the profile 3 results from the peripheral speed.
  • the cause is the strong constriction of the flow and the loss of friction on the large inner surface of the profile.
  • the finned tubes according to the invention can be produced, for example, from a centrifugally cast tube by twisting the ends of a tube with axially parallel ribs against one another, or by deforming the inner profile by forming a centrifugally cast tube, for example by hot forging. Hot drawing or cold forming over a profile tool, for example, a flying dome or a mandrel with an inner profile of the tube corresponding outer profile is generated.
  • Cutting machines for internal profiling of pipes are in different variants, for example from the German patent 195 23 280 known. These machines are also suitable for producing a finned tube according to the invention.
  • the forming temperature When hot forming solite the forming temperature should be adjusted so that it comes in the region of the inner surface to a partial destruction of the grain structure and therefore later under the influence of the operating temperature to a recrystallization.
  • the result of this is a fine-grained microstructure, which leads to a rapid diffusion of chromium, silicon and / or aluminum through the austenitic matrix to the inner surface of the tube and there for the rapid construction of an oxide protective layer.
  • the ribs according to the invention can also be produced by build-up welding; in this case, between the individual ribs no curved Ridge bottom arise, but it remains there the original course of the inner wall of the tube is substantially preserved.
  • the inner surface of the tube according to the invention should have the lowest possible roughness; it can therefore be smoothed, for example mechanically polished or electrolytically leveled.
  • iron or nickel alloys with 0.1% to 0.5% carbon 20 to 35% chromium. 20 to 70% nickel, up to 3% silicon, up to 1% niobium, up to 5% tungsten and hafnium additions. Titanium, rare earth, or zirconium, each containing up to 0.5% and up to 6% aluminum.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Metallurgy (AREA)
  • General Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Geometry (AREA)
  • General Engineering & Computer Science (AREA)
  • Production Of Liquid Hydrocarbon Mixture For Refining Petroleum (AREA)
  • Physical Or Chemical Processes And Apparatus (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
EP10012045A 2002-07-25 2003-05-08 Tuyau profilé pour le craquage thermique d'hydrocarbure Withdrawn EP2298850A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10233961A DE10233961A1 (de) 2002-07-25 2002-07-25 Verfahren zum thermischen Spalten von Kohlenwasserstoffen
EP03725176A EP1525289B9 (fr) 2002-07-25 2003-05-08 Procede et tube a ailettes pour separation thermique d'hydrocarbures

Related Parent Applications (2)

Application Number Title Priority Date Filing Date
EP03725176 Previously-Filed-Application 2003-05-08
EP03725176.6 Division 2003-05-08

Publications (1)

Publication Number Publication Date
EP2298850A1 true EP2298850A1 (fr) 2011-03-23

Family

ID=30128404

Family Applications (2)

Application Number Title Priority Date Filing Date
EP10012045A Withdrawn EP2298850A1 (fr) 2002-07-25 2003-05-08 Tuyau profilé pour le craquage thermique d'hydrocarbure
EP03725176A Expired - Lifetime EP1525289B9 (fr) 2002-07-25 2003-05-08 Procede et tube a ailettes pour separation thermique d'hydrocarbures

Family Applications After (1)

Application Number Title Priority Date Filing Date
EP03725176A Expired - Lifetime EP1525289B9 (fr) 2002-07-25 2003-05-08 Procede et tube a ailettes pour separation thermique d'hydrocarbures

Country Status (22)

Country Link
EP (2) EP2298850A1 (fr)
JP (2) JP4536512B2 (fr)
KR (1) KR101023668B1 (fr)
CN (1) CN100523133C (fr)
AT (1) ATE526385T1 (fr)
AU (1) AU2003227737A1 (fr)
BR (1) BR0312919B1 (fr)
CA (1) CA2493463C (fr)
DE (1) DE10233961A1 (fr)
EA (1) EA010936B1 (fr)
ES (1) ES2374568T3 (fr)
HR (1) HRP20050072A2 (fr)
IL (1) IL166229A (fr)
MA (1) MA27325A1 (fr)
MX (1) MXPA05001070A (fr)
NO (1) NO337398B1 (fr)
NZ (1) NZ537827A (fr)
PL (1) PL204769B1 (fr)
PT (1) PT1525289E (fr)
RS (1) RS20050060A (fr)
UA (1) UA85044C2 (fr)
WO (1) WO2004015029A1 (fr)

Families Citing this family (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DK2037202T3 (en) 2006-07-05 2018-11-19 Nippon Steel & Sumitomo Metal Corp Metal pipe for thermal cracking reaction
WO2010106070A1 (fr) * 2009-03-17 2010-09-23 Total Petrochemicals Research Feluy Procédé pour le refroidissement brusque de l'effluent gazeux d'un four
EP2813286A1 (fr) * 2013-06-11 2014-12-17 Evonik Industries AG Tube de réaction et procédé de fabrication de cyanure d'hydrogène
FR3033266B1 (fr) * 2015-03-05 2017-03-03 Ifp Energies Now Ensemble de collecte d'un fluide gazeux pour reacteur radial
WO2017007649A1 (fr) 2015-07-09 2017-01-12 Sabic Global Technologies B.V. Minimisation de la formation de coke dans un système de craquage d'hydrocarbures
JP6107905B2 (ja) * 2015-09-09 2017-04-05 株式会社富士通ゼネラル 熱交換器
CN109072090B (zh) * 2016-04-12 2021-03-16 巴斯夫安特卫普股份有限公司 用于裂解炉的反应器
DE102016012907B4 (de) * 2016-10-26 2025-04-24 Schmidt + Clemens Gmbh + Co. Kg Tieflochbohrverfahren sowie Werkzeug für eine Tieflochbohrmaschine und Tieflochbohrmaschine
HUE066462T2 (hu) * 2017-04-07 2024-08-28 Schmidt Clemens Gmbh Co Kg Csõ és berendezés szénhidrogének termikus krakkolásához
EP3606657A1 (fr) * 2017-04-07 2020-02-12 Schmidt + Clemens GmbH & Co. KG Tuyau et dispositif pour réaliser une fission thermique d'hydrocarbures
DE102017003409B4 (de) 2017-04-07 2023-08-10 Schmidt + Clemens Gmbh + Co. Kg Rohr und Vorrichtung zum thermischen Spalten von Kohlenwasserstoffen
US11053445B2 (en) * 2017-05-05 2021-07-06 Exxonmobil Chemical Patents Inc. Heat transfer tube for hydrocarbon processing
MY201675A (en) * 2017-10-27 2024-03-12 China Petroleum & Chem Corp Heat transfer enhancement pipe as well as cracking furnace and atmospheric and vacuum heating furnace including the same
GB2590363B (en) * 2019-12-09 2023-06-28 Paralloy Ltd Internally profiled tubes
CN116026278B (zh) * 2022-12-21 2025-10-31 湖南特种玻璃研究院有限公司 一种溢流砖寿命预测方法

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB969796A (en) 1961-03-01 1964-09-16 Exxon Research Engineering Co Apparatus for heating fluids and tubes for disposal therein
DE4427859A1 (de) * 1994-08-05 1995-10-26 Siemens Ag Rohr mit auf seiner Innenseite ein mehrgängiges Gewinde bildenden Rippen sowie Dampferzeuger zu seiner Verwendung
DE19523280A1 (de) 1995-06-27 1997-01-02 Gfm Gmbh Schmiedemaschine zum Innenprofilieren von rohrförmigen Werkstücken
EP1136541A1 (fr) * 1997-06-10 2001-09-26 ExxonMobil Chemical Patents Inc. Four à pyrolyse équipé d'un serpentin rayonnant en U à ailettes internes

Family Cites Families (5)

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Publication number Priority date Publication date Assignee Title
JPS58132081A (ja) * 1982-01-08 1983-08-06 Idemitsu Petrochem Co Ltd 炭化水素の熱分解方法
DE3716665A1 (de) * 1987-05-19 1988-12-08 Vdm Nickel Tech Korrosionsbestaendige legierung
JP3001181B2 (ja) 1994-07-11 2000-01-24 株式会社クボタ エチレン製造用反応管
DE19629977C2 (de) * 1996-07-25 2002-09-19 Schmidt & Clemens Gmbh & Co Ed Werkstück aus einer austenitischen Nickel-Chrom-Stahllegierung
JPH11199876A (ja) * 1998-01-16 1999-07-27 Kubota Corp コーキング減少性能を有するエチレン製造用熱分解管

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB969796A (en) 1961-03-01 1964-09-16 Exxon Research Engineering Co Apparatus for heating fluids and tubes for disposal therein
DE4427859A1 (de) * 1994-08-05 1995-10-26 Siemens Ag Rohr mit auf seiner Innenseite ein mehrgängiges Gewinde bildenden Rippen sowie Dampferzeuger zu seiner Verwendung
DE19523280A1 (de) 1995-06-27 1997-01-02 Gfm Gmbh Schmiedemaschine zum Innenprofilieren von rohrförmigen Werkstücken
EP1136541A1 (fr) * 1997-06-10 2001-09-26 ExxonMobil Chemical Patents Inc. Four à pyrolyse équipé d'un serpentin rayonnant en U à ailettes internes

Also Published As

Publication number Publication date
BR0312919A (pt) 2005-07-05
PL204769B1 (pl) 2010-02-26
KR101023668B1 (ko) 2011-03-25
CN100523133C (zh) 2009-08-05
EP1525289B9 (fr) 2012-02-29
PL373967A1 (en) 2005-09-19
NO20050493L (no) 2005-03-17
EP1525289B1 (fr) 2011-09-28
ATE526385T1 (de) 2011-10-15
UA85044C2 (ru) 2008-12-25
DE10233961A1 (de) 2004-02-12
PT1525289E (pt) 2012-01-04
EA010936B1 (ru) 2008-12-30
ES2374568T3 (es) 2012-02-17
NZ537827A (en) 2007-04-27
JP2010150553A (ja) 2010-07-08
CN1671824A (zh) 2005-09-21
JP4536512B2 (ja) 2010-09-01
EA200500258A1 (ru) 2005-08-25
NO337398B1 (no) 2016-04-04
CA2493463A1 (fr) 2004-02-19
CA2493463C (fr) 2013-01-15
AU2003227737A1 (en) 2004-02-25
MXPA05001070A (es) 2005-10-05
IL166229A (en) 2008-11-26
IL166229A0 (en) 2006-01-15
RS20050060A (sr) 2007-09-21
JP2005533917A (ja) 2005-11-10
EP1525289A1 (fr) 2005-04-27
MA27325A1 (fr) 2005-05-02
BR0312919B1 (pt) 2014-06-24
KR20050052457A (ko) 2005-06-02
WO2004015029A1 (fr) 2004-02-19
HRP20050072A2 (en) 2005-08-31

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