JP2007506866A - Radiant tube for cracking furnace - Google Patents
Radiant tube for cracking furnace Download PDFInfo
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- JP2007506866A JP2007506866A JP2006532193A JP2006532193A JP2007506866A JP 2007506866 A JP2007506866 A JP 2007506866A JP 2006532193 A JP2006532193 A JP 2006532193A JP 2006532193 A JP2006532193 A JP 2006532193A JP 2007506866 A JP2007506866 A JP 2007506866A
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- JP
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- Prior art keywords
- radiant tube
- less
- tube
- hafnium
- yttrium
- Prior art date
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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
- C22C38/22—Ferrous alloys, e.g. steel alloys containing chromium with molybdenum or tungsten
-
- 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
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Organic Chemistry (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Physics & Mathematics (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Thermal Sciences (AREA)
- Production Of Liquid Hydrocarbon Mixture For Refining Petroleum (AREA)
- Combustion Of Fluid Fuel (AREA)
- Gas Burners (AREA)
Abstract
分解炉に用いるラジアントチューブを開示。分解が起きる温度まで外部から加熱されているラジアントチューブ内に炭化水素を流して分解し、エチレンにする。ラジアントチューブは、Feに10〜25wt%のCr、1〜10wt%のAl、1.5〜5wt%のモリブデンを添加したFeCrAl材料で作製されている。任意成分として、タンタル、ハフニウム、ジルコニウム、イットリウム、窒素、炭素、酸素から成る群から選択した1種以上の合金成分を合計で2.2wt%以下、望ましくは2.0wt%以下、更に望ましくは1.0wt%以下の量で含有する。 Disclosed radiant tube used in cracking furnace. Hydrocarbon is allowed to flow in a radiant tube heated from the outside to a temperature at which decomposition occurs to decompose it into ethylene. The radiant tube is made of an FeCrAl material in which 10 to 25 wt% Cr, 1 to 10 wt% Al, and 1.5 to 5 wt% molybdenum are added to Fe. As an optional component, a total of one or more alloy components selected from the group consisting of tantalum, hafnium, zirconium, yttrium, nitrogen, carbon, and oxygen is 2.2 wt% or less, preferably 2.0 wt% or less, more preferably 1 It is contained in an amount of 0.0 wt% or less.
Description
本発明は、分解炉、特にエチレン分解炉用として十分なクリープ強度、延性、寿命を有する材料で形成したラジアントチューブに関する。 The present invention relates to a radiant tube formed of a material having sufficient creep strength, ductility, and life for a cracking furnace, particularly an ethylene cracking furnace.
以下の従来技術の説明においては、特定の構造および方法に言及する。しかし、以下における言及は下記の構造および/または方法が先行技術であることを認めるという意味ではない。本出願人は、以下に言及する構造および/方法が本発明に対して先行技術としての地位を持たないことを表明する権利を積極的に留保する。 In the following description of the prior art, reference will be made to specific structures and methods. However, references below do not mean that the following structures and / or methods are admitted to be prior art. Applicants actively reserve the right to express that the structures and / or methods referred to below do not have prior art status with respect to the present invention.
分解炉あるいはエチレン炉においては、炭化水素が分解してエチレンH2C=H2Cとなり、これをプラスチック工業の原材料とする。 In the cracking furnace or ethylene furnace, the hydrocarbon is decomposed to ethylene H 2 C = H 2 C, which is used as a raw material for the plastic industry.
分解を行なうには、エチレンの生成に十分な高温、例えば1100℃程度に予め周囲のバーナーで加熱しておいたラジアントチューブに炭化水素を装入する。 In order to carry out the decomposition, hydrocarbons are charged into a radiant tube that has been heated in advance by a surrounding burner at a high temperature sufficient to produce ethylene, for example, about 1100 ° C.
典型的には、ラジアントチューブは上記のような高温に長時間耐える必要がある。そのため通常は、ラジアントチューブはFeCrAl材料で作製されている。この材料を用いる一つの理由は、加熱・冷却に対する耐久性があることに加えて、チューブの外表面および内表面に緻密な酸化アルミニウムAl2O3が生成することである。この酸化物は、Feがコークス生成の触媒として作用する場合、チューブ内を流れるガスとFeの接触を防止する。チューブ内にコークスが生成すると、チューブ内壁に付着堆積し、チューブ内のガス流が少なくなるし、チューブ内への熱伝達も減少する。コークスによってチューブが完全に閉塞することもある。 Typically, radiant tubes need to withstand such high temperatures for extended periods of time. Therefore, the radiant tube is usually made of FeCrAl material. One reason for using this material is that in addition to durability against heating and cooling, dense aluminum oxide Al 2 O 3 is formed on the outer and inner surfaces of the tube. This oxide prevents contact between the gas flowing in the tube and Fe when Fe acts as a catalyst for coke formation. When coke is generated in the tube, it adheres and accumulates on the inner wall of the tube, reducing the gas flow in the tube and reducing heat transfer into the tube. Coke may completely occlude the tube.
スエーデン特許第467414号には、FeCrAl材料にコバルト、ニッケル、シリコン、マンガン、ジルコニウム、チタンと少量のイットリウムおよびハフニウムとを添加し、1050℃で熱処理して、長さ5mm以上、長さ/断面積の比が10〜1である非常に細長い粒子を形成することにより、クリープ強度を高めることが開示されている。この材料でラジアントチューブを作製している。 In Swedish Patent No. 467414, cobalt, nickel, silicon, manganese, zirconium, titanium and a small amount of yttrium and hafnium are added to FeCrAl material and heat-treated at 1050 ° C., and the length / cross-sectional area is 5 mm or more. It has been disclosed to increase the creep strength by forming very elongated particles with a ratio of 10 to 1. Radiant tubes are made with this material.
スエーデン特許第513989号には、ガスアトマイズ法によりFeCrAl材料を製造する方法が開示されている。ガスアトマイズの問題として、チタンを含有するFeCrAl材料を製造する際に、アトマイズ前の装入材料中にTiNおよびTiCの小粒子が生成し、これがアトマイズ用の溶湯ノズルに捕捉されてノズル閉塞を起こす。その対策としてスエーデン特許第513989号は、アトマイズ用の装入材料のタンタル含有量を0.05〜0.50wt%とすると共にチタン含有量を0.10wt%未満とすることを提案している。スエーデン特許第513989号には、モリブデン(Mo)を含有しても良いと記載されている。 Swedish Patent No. 513989 discloses a method for producing an FeCrAl material by a gas atomization method. As a problem of gas atomization, when producing a FeCrAl material containing titanium, small particles of TiN and TiC are generated in the charging material before atomization, and this is trapped by the molten metal nozzle for atomization and causes nozzle clogging. As a countermeasure, Swedish Patent No. 513989 proposes that the tantalum content of the atomizing material is 0.05 to 0.50 wt% and the titanium content is less than 0.10 wt%. Swedish Patent No. 513989 describes that molybdenum (Mo) may be contained.
更に、スエーデン特許第467414号には、クリープ強度を高めた材料が開示されている。しかし、クリープ強度、延性、寿命に対する要求水準が更に高まっている。また、従来よりも高い温度で長時間の耐久性がある、より長尺のチューブが求められている。 Furthermore, Swedish Patent No. 467414 discloses a material with increased creep strength. However, the required levels for creep strength, ductility and life are further increasing. In addition, there is a need for a longer tube that is durable for a long time at a higher temperature than before.
そこで本発明は、ラジアントチューブを炭化水素の分解が起こる温度に外部から加熱し、チューブ内を流れる炭化水素を分解してエチレンにする分解炉用ラジアントチューブに関し、該チューブは、Feに10〜25wt%のCr、1〜10wt%のAl、1.5〜5wt%のMoを添加したFeCrAl材料で作製されていることを特徴とする。任意成分として、タンタル、ハフニウム、ジルコニウム、イットリウム、窒素、炭素および酸素から成る群から選択された1種以上の合金成分を、合計で2.2wt%以下、望ましくは2.0wt%以下、更に望ましくは1.0wt%以下の量で含有する。 Therefore, the present invention relates to a radiant tube for a cracking furnace in which a radiant tube is heated from the outside to a temperature at which hydrocarbon decomposition occurs, and the hydrocarbon flowing in the tube is decomposed into ethylene, and the tube has a Fe content of 10 to 25 wt. % Cr, 1-10 wt% Al, 1.5-5 wt% Mo added FeCrAl material. As an optional component, one or more alloy components selected from the group consisting of tantalum, hafnium, zirconium, yttrium, nitrogen, carbon, and oxygen are combined in a total amount of 2.2 wt% or less, preferably 2.0 wt% or less, and more preferably Is contained in an amount of 1.0 wt% or less.
本実施形態においては、内部を流れる炭化水素を分解してエチレンにする分解炉用ラジアントチューブを説明する。このラジアントチューブは外部から分解温度に加熱される。典型的には、加熱温度はガス流入口で900℃、ガス流出口で1125℃である。 In the present embodiment, a radiant tube for a cracking furnace will be described in which hydrocarbon flowing inside is decomposed into ethylene. This radiant tube is heated to the decomposition temperature from the outside. Typically, the heating temperature is 900 ° C. at the gas inlet and 1125 ° C. at the gas outlet.
一実施例として、Feに10〜25wt%のCr、1〜10wt%のAl、1.5〜5wt%のMoを添加したFeCrAl材料でチューブが作製されている。 As an example, a tube is made of a FeCrAl material in which 10 to 25 wt% Cr, 1 to 10 wt% Al, and 1.5 to 5 wt% Mo are added to Fe.
本発明の材料は、タンタル、ハフニウム、ジルコニウム、イットリウム、窒素、炭素、酸素のうちの1種以上の合金成分を少量含有することが望ましい。例えば、一実施例として、本発明の材料はタンタル、ハフニウム、ジルコニウム、イットリウム、窒素、炭素、酸素から成る群から選択された1種以上の合金成分を、合計で2.2wt%以下、望ましくは2.0wt%以下、更に望ましくは1.0wt%以下の量で含有する。 The material of the present invention preferably contains a small amount of one or more alloy components of tantalum, hafnium, zirconium, yttrium, nitrogen, carbon, and oxygen. For example, in one embodiment, the material of the present invention is composed of one or more alloy components selected from the group consisting of tantalum, hafnium, zirconium, yttrium, nitrogen, carbon, and oxygen in a total amount of 2.2 wt% or less, preferably It is contained in an amount of 2.0 wt% or less, more preferably 1.0 wt% or less.
非常に望ましい実施形態においては、本発明の材料は、2〜3.5wt%のモリブデンを含有する。モリブデンの含有量は多過ぎてはいけないが、それでもスエーデン特許第467414号の材料に比べれば強度的に有利である。その理由は、モリブデンの含有量が多過ぎると、揮発性のモリブデン酸化物MoO3が生成し、これが気化して蒸発するからである。そのため、モリブデン含有量が減少すると、強度が減少する。 In a highly desirable embodiment, the material of the present invention contains 2 to 3.5 wt% molybdenum. The molybdenum content should not be too high, but it is still advantageous in strength over the material of Swedish Patent No. 467414. The reason is that if the molybdenum content is too high, a volatile molybdenum oxide MoO 3 is generated, which vaporizes and evaporates. Therefore, the strength decreases as the molybdenum content decreases.
望ましい実施形態によれば、チューブを作製するのに望ましい材料は、温度1100℃、荷重2.2MPaにおける破断時間が100,000時間以上であるクリープ強度を持つ材料である。このクリープ強度はスエーデン特許第467414号に開示されている材料で作製されたチューブのクリープ強度のほぼ2倍に相当する。 According to a preferred embodiment, a desirable material for producing the tube is a material having a creep strength with a breaking time at a temperature of 1100 ° C. and a load of 2.2 MPa of 100,000 hours or more. This creep strength corresponds to approximately twice the creep strength of a tube made of the material disclosed in Swedish Patent 467414.
クリープ強度が高くなれば必然的にチューブの寿命も長くなる。 Increasing the creep strength inevitably increases the life of the tube.
強度が高くなれば従来の分解チューブよりも長尺に作製できる。典型的には分解チューブは長さ10〜17mのものがある。このようなチューブは2本以上のチューブを長さ方向に溶接して作製される。望ましい実施形態においては、1本のチューブで長さ10mを超えるものが作製できる。 If the strength increases, it can be made longer than the conventional decomposition tube. Typically, the decomposition tube has a length of 10 to 17 m. Such a tube is produced by welding two or more tubes in the length direction. In a preferred embodiment, a single tube can be made that is longer than 10 m.
もう一つの実施例では、チューブの材料として、合金成分の含有量を低下させたものを用いる。 In another embodiment, a tube material having a reduced alloy component content is used.
以上、本発明の望ましい実施形態について説明したが、特許請求の範囲の範囲内において種々の変更が可能である。 Although the preferred embodiments of the present invention have been described above, various modifications can be made within the scope of the claims.
Claims (6)
Cr:10〜25wt%、
Al:1〜10wt%、
Mo:1.5〜5wt%、および
残部:Fe
から成る材料で作製されたことを特徴とするラジアントチューブ。 For radiant tubes used in hydrocarbon cracking furnaces:
Cr: 10 to 25 wt%,
Al: 1 to 10 wt%,
Mo: 1.5 to 5 wt%, and balance: Fe
A radiant tube made of a material made of
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE0301500A SE524010C2 (en) | 2003-05-20 | 2003-05-20 | Radiation tube in cracker oven |
PCT/SE2004/000757 WO2004104257A1 (en) | 2003-05-20 | 2004-05-14 | Radiant tube in cracking furnaces |
Publications (1)
Publication Number | Publication Date |
---|---|
JP2007506866A true JP2007506866A (en) | 2007-03-22 |
Family
ID=20291377
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2006532193A Pending JP2007506866A (en) | 2003-05-20 | 2004-05-14 | Radiant tube for cracking furnace |
Country Status (6)
Country | Link |
---|---|
US (1) | US20050019202A1 (en) |
EP (1) | EP1627093A1 (en) |
JP (1) | JP2007506866A (en) |
CN (1) | CN100365151C (en) |
SE (1) | SE524010C2 (en) |
WO (1) | WO2004104257A1 (en) |
Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
ITMI20040040A1 (en) * | 2004-01-15 | 2004-04-15 | Maurizio Spoto | INCREASED HEAT EXCHANGER ELEMENT |
SE528189C2 (en) * | 2004-12-21 | 2006-09-19 | Sandvik Intellectual Property | Method and pipe joint for joining components comprising or made of a material which is difficult to weld |
SE529444C2 (en) * | 2005-12-02 | 2007-08-14 | Sandvik Intellectual Property | Pipes and use of the pipe |
EP2031080B1 (en) * | 2007-08-30 | 2012-06-27 | Alstom Technology Ltd | High temperature alloy |
WO2009045136A1 (en) * | 2007-10-05 | 2009-04-09 | Sandvik Intellectual Property Ab | The use and method of producing a dispersion strengthened steel as material in a roller for a roller hearth furnace |
CN102230132B (en) * | 2011-07-04 | 2012-11-21 | 大连理工大学 | Fe-Cr-Mo-Al-Cu corrosion-resistant high temperature alloy |
CN210287474U (en) * | 2019-06-01 | 2020-04-10 | 上海颐柏科技股份有限公司 | Methanol and propane cracking device based on radiant tube |
CN117144264B (en) * | 2023-10-31 | 2024-02-02 | 上海核工程研究设计院股份有限公司 | Ferrite heat-resistant alloy for light water reactor fuel assembly, manufacturing method and application |
Citations (7)
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JPH04354850A (en) * | 1991-05-29 | 1992-12-09 | Nisshin Steel Co Ltd | High al-containing ferritic stainless steel excellent in high temperature oxidation resistance |
JPH05112784A (en) * | 1990-05-14 | 1993-05-07 | Kanthal:Ab | Cracking furnace for hydrocarbon |
JPH0941096A (en) * | 1995-08-04 | 1997-02-10 | Mitsubishi Heavy Ind Ltd | Turbine blade material |
JPH1163853A (en) * | 1997-08-20 | 1999-03-05 | Jgc Corp | Heating furnace pipe and manufacture of heating furnace pipe |
JPH11209850A (en) * | 1998-01-23 | 1999-08-03 | Jgc Corp | Heating furnace tube, and use of heating furnace tube |
WO2001049441A1 (en) * | 2000-01-01 | 2001-07-12 | Sandvik Ab | Method of making a fecral material and such material |
JP2001514327A (en) * | 1997-08-12 | 2001-09-11 | サンドビック アクティエボラーグ | Steel alloy for composite pipe |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
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AT131135B (en) * | 1930-08-27 | 1933-01-10 | Ver Stahlwerke Ag | Cracking device. |
US4498928A (en) * | 1984-02-06 | 1985-02-12 | The United States Of America As Represented By The Secretary Of Interior | Ductile duplex iron-based alloy containing aluminum |
TW548334B (en) * | 1997-08-20 | 2003-08-21 | Jgc Corp | Heating furnace and method of manufacturing the same |
-
2003
- 2003-05-20 SE SE0301500A patent/SE524010C2/en not_active IP Right Cessation
-
2004
- 2004-05-14 JP JP2006532193A patent/JP2007506866A/en active Pending
- 2004-05-14 EP EP04733228A patent/EP1627093A1/en not_active Withdrawn
- 2004-05-14 CN CNB2004800137969A patent/CN100365151C/en not_active Expired - Fee Related
- 2004-05-14 WO PCT/SE2004/000757 patent/WO2004104257A1/en active Application Filing
- 2004-05-17 US US10/846,593 patent/US20050019202A1/en not_active Abandoned
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH05112784A (en) * | 1990-05-14 | 1993-05-07 | Kanthal:Ab | Cracking furnace for hydrocarbon |
JPH04354850A (en) * | 1991-05-29 | 1992-12-09 | Nisshin Steel Co Ltd | High al-containing ferritic stainless steel excellent in high temperature oxidation resistance |
JPH0941096A (en) * | 1995-08-04 | 1997-02-10 | Mitsubishi Heavy Ind Ltd | Turbine blade material |
JP2001514327A (en) * | 1997-08-12 | 2001-09-11 | サンドビック アクティエボラーグ | Steel alloy for composite pipe |
JPH1163853A (en) * | 1997-08-20 | 1999-03-05 | Jgc Corp | Heating furnace pipe and manufacture of heating furnace pipe |
JPH11209850A (en) * | 1998-01-23 | 1999-08-03 | Jgc Corp | Heating furnace tube, and use of heating furnace tube |
WO2001049441A1 (en) * | 2000-01-01 | 2001-07-12 | Sandvik Ab | Method of making a fecral material and such material |
Also Published As
Publication number | Publication date |
---|---|
US20050019202A1 (en) | 2005-01-27 |
CN100365151C (en) | 2008-01-30 |
SE0301500L (en) | 2004-06-15 |
EP1627093A1 (en) | 2006-02-22 |
SE0301500D0 (en) | 2003-05-20 |
WO2004104257A1 (en) | 2004-12-02 |
CN1802447A (en) | 2006-07-12 |
SE524010C2 (en) | 2004-06-15 |
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