EP0451052B1 - Verbesserte Konstruktion für Brenner und Blasformöffnungen in Öfen und vertikalen Reaktoren - Google Patents

Verbesserte Konstruktion für Brenner und Blasformöffnungen in Öfen und vertikalen Reaktoren Download PDF

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Publication number
EP0451052B1
EP0451052B1 EP91400902A EP91400902A EP0451052B1 EP 0451052 B1 EP0451052 B1 EP 0451052B1 EP 91400902 A EP91400902 A EP 91400902A EP 91400902 A EP91400902 A EP 91400902A EP 0451052 B1 EP0451052 B1 EP 0451052B1
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EP
European Patent Office
Prior art keywords
refractory
concrete
opening assembly
elements
tuyere
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.)
Expired - Lifetime
Application number
EP91400902A
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English (en)
French (fr)
Other versions
EP0451052A1 (de
Inventor
Jacques Schoennahl
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.)
Savoie Refractaires SA
Original Assignee
Savoie Refractaires SA
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 Savoie Refractaires SA filed Critical Savoie Refractaires SA
Publication of EP0451052A1 publication Critical patent/EP0451052A1/de
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Anticipated expiration legal-status Critical
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Classifications

    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B7/00—Blast furnaces
    • C21B7/16—Tuyéres
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B1/00—Shaft or like vertical or substantially vertical furnaces
    • F27B1/10—Details, accessories or equipment specially adapted for furnaces of these types
    • F27B1/16—Arrangements of tuyeres

Definitions

  • the present invention relates to improvements in the production of burner openings or surrounding nozzles of furnaces and vertical reactors.
  • the constituent parts of the surrounds are subject to cracking by thermal shock, to impregnation with potassium vapors which condense in the form of K2O or K2CO3 and attack the refractory material in depth making it brittle, and wear by abrasion and erosion caused by the downward load on the material weakened by the previous attacks.
  • the burner openings or the nozzles surrounds are traditionally constituted by the assembly of a large number of refractory, ceramized keys, for example made of silicon carbide with a silicon nitride binder or based on corundum grains with a mullite or sialon binder , of different and relatively complex shapes.
  • the present invention aims to solve the above-mentioned problems by providing burner ports and improved nozzle surrounds for ovens or vertical reactors.
  • the invention relates to a burner flue or a nozzle surround of a vertical furnace or reactor constituted by the assembly of at most four prefabricated elements of molded refractory concrete, characterized in that each element further comprises , a coating bonded to concrete and consisting of ceramic refractory keys of identical shape and dimensions, forming a unitary composite assembly with said element and disposed between the part of the element of refractory molded concrete and the opening intended to receive the burner or the nozzle.
  • the ceramic keyboards constituting the covering can be easily produced by an automatic shaping process, for example by uniaxial pressing.
  • a material based on corundum grains and / or silicon carbide bonded by a nitride or sialon binder such as the CORANIT (R) product comprising approximately 75% of alumina and 25% of a nitrided binder of the sialon type and silicon oxynitride; the product SICANIT (R) 20 which comprises approximately 76% of silicon carbide and 25% of a nitrided binder or the product SICANIT (R) AL comprising approximately 9.5% of alumina, 67% of silicon carbide and 23 , 5% of a nitrided binder of the sialon type, which are sold by the applicant.
  • CORANIT (R) product comprising approximately 75% of alumina and 25% of a nitrided binder of the sialon type and silicon oxynitride
  • SICANIT (R) 20 which comprises approximately 7
  • keyboards can be put in place either at the time of the molding of the concrete part of the elements, by placing the keyboards in the mold used for molding the concrete during the casting of the latter, or after demolding of the concrete part. elements, by jointing by means of a refractory cement, so that the concrete-keystone association forms a unitary composite assembly.
  • refractory concretes use may be made of those described in French patent 2,390,400 or the corresponding German patent 27 59809, the teachings of which are incorporated here by reference, with the exception of concrete containing carbon whose presence is to be avoided.
  • these concretes are formed, by weight, by (A) 70-90% of a refractory aggregate and by (B) 10-30% of a cement consisting of (i) 10-30% of a substance alkaline earth mineral, (ii) 14-54% of ultra-fine particles with a particle size of 100 nm to 0.1 ⁇ m and (iii) 14-54% of fine particles with a particle size of 1 to 10 ⁇ m.
  • vibrated concretes comprising an aggregate formed of alumina with a hydraulic binder such as CRISTARAM (R) concrete with 93% of alumina, the aggregate of which is white corundum quine requires only 3% of 'water and which has a density of 3250 kg / m3 and a resistance to cold crushing greater than 140 MPa; or CORAL (R) concrete with 89% alumina, the aggregate of which is corundum brown, which requires only about 2.5% water and which has a density of 3350 kg / m3 and resistance to cold crushing greater than 50 MPa, both of which are sold by the plaintiff.
  • CRISTARAM R
  • CORAL (R) concrete with 89% alumina the aggregate of which is corundum brown, which requires only about 2.5% water and which has a density of 3350 kg / m3 and resistance to cold crushing greater than 50 MPa, both of which are sold by the plaintiff.
  • Such concretes also have the advantage of being thermally insulating, having a thermal conductivity at 800 ° C of approximately 4W / mK.
  • materials based on carbon or silicon carbide have a thermal conductivity. more than 15W / mK
  • the molded refractory concrete elements are reinforced by incorporating reinforcing elements, such as stainless steel fibers, into the concrete used.
  • reinforcing elements such as stainless steel fibers
  • An example of commercially available reinforcing stainless steel fibers are the ZP 30/40 SS 304 fibers sold by the company DRAMIX.
  • the addition of steel reinforcing fibers improves resistance to fragmentation by thermal shock, thus avoiding the fragmentation of parts.
  • tests have shown that resistance to corrosion by carbon monoxide is not affected by the incorporation of steel fibers, as might have been feared.
  • Figures 1 and 2 show a conventional surround 1 of the nozzle 2 of a blast furnace 3 (shown partially).
  • This entourage which is shown hatched in Figure 1, is formed by the assembly of a large number of ceramic refractory keys 4 of different shapes, the resulting assembly defining an opening or passage 5 adapted to the housing of the frustoconical nozzle 2, the axis of which is slightly inclined downwards.
  • FIGS 3 and 4 show an entourage according to the invention 11.
  • This entourage is formed by the assembly of four prefabricated elements 12.
  • Each element 12 is formed of an outer part 13 of refractory molded concrete (shown in thin shading on the Figure 3), integral with an inner coating 14 defining the opening or passage 5 intended to receive the nozzle 2 of the blast furnace 3 and constituted by the assembly of ceramic refractory keys 15 of identical shape and size, which have a shape corner in their vertical and longitudinal directions.
  • these pins only extend over part of the total thickness of the elements 12, this part including the face of the elements facing the interior of the furnace or reactor. This is interesting from an economic point of view because it makes it possible to reduce the quantity of the material constituting these pins which is an expensive material.
  • the coverings 14 constitute together an inner crown of frustoconical shape whose axis is slightly inclined downward and which is embedded in the parts 13 of refractory concrete of the elements, the front face 16 of this crown being located on the side of the interior 17 of the top- furnace.
  • the elements 13 are composite concrete-ceramic key elements which exhibit excellent behavior in service.
  • the internal crown in ceramic refractory keys (for example in corundum and / or silicon carbide with nitride or sialon binder) simultaneously exhibits excellent resistance to thermal shock, low thermal conductivity, very high mechanical resistance making it possible to withstand static mechanical stresses acting on the entire surrounding, as well as excellent resistance to abrasion and erosion which makes it possible to slow down the wear of the refractory concrete parts which surround it.
  • the molded concrete parts can, for their part, be considered as playing the role of a cradle for holding the keyboards and of a filling material.
  • the assembly of the elements 12 can be done by simple juxtaposition of the said elements, with or without jointing using a refractory cement or mortar.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Furnace Housings, Linings, Walls, And Ceilings (AREA)
  • Compositions Of Oxide Ceramics (AREA)

Claims (6)

  1. Brenneröffnung oder Ummantelung der Blasöffnung eines Ofens oder eines vertikalen Reaktors, gebildet durch Zusammenfügen von höchstens vier vorgefertigten Elementen (12) aus geformtem Feuerfestbeton, dadurch gekennzeichnet, daß jedes Element ferner eine Verkleidung (14) aufweist, die aus keramisierten feuerfesten Formsteinen mit identischen Formen und Abmessungen besteht, die mit dem Element eine einheitliche Verbundeinheit bilden und zwischen dem Teil (13) des aus geformtem Feuerfestbeton bestehenden Elements und der Öffnung (5) zur Aufnahme des Brenners oder der Blasöffnung angeordnet ist.
  2. Öffnung oder Ummantelung nach Anspruch 1, dadurch gekennzeichnet, daß der Feuerfestbeton ein Granulat aus Aluminiumoxid und einen hydraulischen Binder enthält.
  3. Öffnung oder Ummantelung nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß der keramisierte feuerfeste Formstein aus durch einen Nitrid- oder Sialon-Binder gebundenen Korund- und/oder Siliziumkarbidkörnern besteht.
  4. Öffnung oder Ummantelung nach Anspruch 1, dadurch gekennzeichnet, daß die Formsteine sich nur über einen Teil der Gesamtdicke der Elemente erstrecken, wobei dieser Teil die dem Inneren des Ofens oder Reaktors zugewandte Seite einschließt.
  5. Verfahren zur Herstellung eines Öffnungs- oder Ummantelungselements nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß die keramisierten Formsteine während des Formens des vorgefertigten Betonelements in der Form angeordnet sind.
  6. Verfahren zur Herstellung eines Öffnungs- oder Ummantelungselements nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß zunächst das Betonteil des Elements durch Gießen hergestellt wird und anschließend die Verkleidung aus Formsteinen nach dem Entformen des Teils mit diesem verbunden wird.
EP91400902A 1990-04-06 1991-04-03 Verbesserte Konstruktion für Brenner und Blasformöffnungen in Öfen und vertikalen Reaktoren Expired - Lifetime EP0451052B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9004452A FR2660742B1 (fr) 1990-04-06 1990-04-06 Perfectionnements a la realisation des ouvreaux de bruleurs ou entourages de tuyeres de fours de reacteurs verticaux.
FR9004452 1990-04-06

Publications (2)

Publication Number Publication Date
EP0451052A1 EP0451052A1 (de) 1991-10-09
EP0451052B1 true EP0451052B1 (de) 1995-09-27

Family

ID=9395521

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Application Number Title Priority Date Filing Date
EP91400902A Expired - Lifetime EP0451052B1 (de) 1990-04-06 1991-04-03 Verbesserte Konstruktion für Brenner und Blasformöffnungen in Öfen und vertikalen Reaktoren

Country Status (5)

Country Link
US (1) US5178819A (de)
EP (1) EP0451052B1 (de)
DE (1) DE69113307T2 (de)
ES (1) ES2080267T3 (de)
FR (1) FR2660742B1 (de)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4234936C1 (de) * 1992-10-16 1993-10-28 Gutehoffnungshuette Man Windformhalterung im Schachtofenpanzer
US5295669A (en) * 1992-10-26 1994-03-22 Caldo International, Inc. Refractory coated iron-based pipe
DE29518283U1 (de) * 1995-11-17 1996-01-04 Agrichema Materialflußtechnik GmbH, 55257 Budenheim Heißbranddüse mit Wechselrohr
DE10108579A1 (de) * 2001-02-22 2002-09-12 Rhi Ag Wien Feuerfester keramischer Körper und zugehöriges metallurgisches Schmelzgefäß
KR100805614B1 (ko) * 2001-12-19 2008-02-20 주식회사 포스코 고로 풍구주변의 내화물 축조방법
DE102018112927A1 (de) * 2018-05-30 2019-12-05 Rheinzink Gmbh & Co. Kg Verfahren für Induktorzustellung
JP7267330B2 (ja) * 2021-02-18 2023-05-01 マフテック株式会社 リジェネバーナ用耐火物ユニット及びその製造方法

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1044760A (en) * 1963-12-10 1966-10-05 Cullinan Refractories Ltd Improvements in or relating to composite refractory lining units
FR1401132A (fr) * 1964-07-21 1965-05-28 Morganite Carbon Ltd Brique réfractaire
US3589318A (en) * 1969-07-31 1971-06-29 Edwin J Szatkowski Blast furnace tuyere openings
US4172107A (en) * 1975-11-10 1979-10-23 Tokyo Shibaura Electric Co., Ltd. Method of manufacturing composite ceramic articles
DE2854998C2 (de) * 1978-12-20 1980-11-20 Thyssen Ag Vorm. August Thyssen Huette, 4100 Duisburg Verwendung von feuerfestem Beton für Hochofen-Auskleidungen
JPS57200506A (en) * 1981-06-05 1982-12-08 Toshiba Ceramics Co Ltd Large sized tuyere brick for shaft furnace
JPS5989709A (ja) * 1982-11-12 1984-05-24 Tokyo Yogyo Co Ltd Ｒｈ下部槽内張構造
US4869854A (en) * 1986-10-31 1989-09-26 Shin-Etsu Chemical Co., Ltd. Process for manufacturing organic silazane polymers and ceramics therefrom
DE8910674U1 (de) * 1989-09-07 1989-10-19 Carborundum Resistant Materials GmbH, 4000 Düsseldorf Wärmedämmplatte

Also Published As

Publication number Publication date
FR2660742A1 (fr) 1991-10-11
FR2660742B1 (fr) 1995-05-05
US5178819A (en) 1993-01-12
DE69113307T2 (de) 1996-03-21
DE69113307D1 (de) 1995-11-02
EP0451052A1 (de) 1991-10-09
ES2080267T3 (es) 1996-02-01

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