EP0149575B1 - Improved shells for hot blast stoves or identical apparatus - Google Patents
Improved shells for hot blast stoves or identical apparatus Download PDFInfo
- Publication number
- EP0149575B1 EP0149575B1 EP85400055A EP85400055A EP0149575B1 EP 0149575 B1 EP0149575 B1 EP 0149575B1 EP 85400055 A EP85400055 A EP 85400055A EP 85400055 A EP85400055 A EP 85400055A EP 0149575 B1 EP0149575 B1 EP 0149575B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- wall
- metal
- shell
- filling material
- space
- 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
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B9/00—Stoves for heating the blast in blast furnaces
- C21B9/02—Brick hot-blast stoves
- C21B9/06—Linings
Definitions
- the present invention relates, in particular, to blast furnace cowpers, that is to say reversing devices in which the air sent to the blast furnace nozzles is heated.
- Such an apparatus comprises a side wall consisting of welded sheet plates, surmounted by a dome also made of welded sheet.
- the enclosure formed by the side wall and the dome houses a combustion chamber and a ruching chamber.
- the purpose of the present invention is to provide a lining of the double jacket more specially adapted to the thermal stresses to be transmitted, while being easy to implement.
- the subject of the invention is an envelope for a cowper or similar air heating device comprising a first wall made of welded sheet metal and comprising a second wall of welded sheet metal, external and parallel to the first, these two walls delimiting a space filled with a filling material, characterized in that the filling material is based on shot of a metal or a light alloy, embedded in a binder based on thermosetting resin.
- the invention also relates to a method of manufacturing such an envelope: in which an inner sheet metal wall is doubled by a second outer sheet metal wall, parallel to the first, this second wall delimiting with the first wall a space, characterized in that this space is filled with a filling material comprising shot of a metal or a light alloy and a binder based on thermosetting resin.
- a part of a cowper envelope or similar device comprising a metallic inner wall 1 made of welded sheet, the thickness of which may be comprised, for example between 15 and 30 mm.
- a refractory lining 2 On the face of this wall facing the interior of the device is a refractory lining 2.
- the outer wall is preferably made in the same grade of steel as the inner wall and has a roughly comparable thickness.
- the inner wall comprises for example a lower part 1a having a thickness of 24 mm and an upper part 1 having a thickness of 17mm.
- the thickness of the outer wall 4a, 4b may vary accordingly, as shown in the drawing.
- the thickness of the interval 5a, 5b of limit between the two walls can vary between for example 3 and 30 mm, a thickness of the order of 10 mm being however preferred.
- the filling material of the gap between the walls is, according to the invention, constituted by aluminum shot or an aluminum alloy whose particles preferably have the dimensions between 0.2 and 2 mm, for example, a dimension of the order of 0.5 or 1.5 mm being particularly favorable.
- the average size of the metal granules is chosen so as to obtain optimal filling of the cells and is, in any event, less than the minimum width of the gap between the two walls.
- aluminum will be used or preferably an aluminum-based alloy or another metal or light alloy with high thermal conductivity.
- the interstices between the metal granules are filled with a binder based on resin or a mixture of thermosetting resin resistant to a temperature equal to or greater than 110 ° C.
- This resin can for example be a powdered phenolic polyurethane resin or in the form of a liquid gel, containing the adjuvants necessary for its hardening and possibly a filler as is conventional in the techniques of molding or casting of such resins.
- the filling of the cells can be carried out as follows: first of all, in a mixer, the metal particles are coated, using the resin in powder or in the form of liquid gel.
- the mixture thus prepared is put into place, by injection or by pouring, optionally under neutral gas such as nitrogen, through orifices 7 into which tubes such as 8 are introduced, for example by screwing. vent holes are provided, if necessary in this same wall 4.
- This positioning of the mixture can be carried out cold.
- a vibration operation is carried out so as to obtain an excellent filling of the cells. This can be done using a high frequency unidirectional vibrator.
- the curing of the resin takes place between 20 minutes and one hour approximately after the introduction of the mixture, this duration naturally depending on the proportions of hardener contained in the mixture.
- This hardening can possibly be accelerated by a slight increase in temperature.
- the orifices such as 7 are then closed, for example by means of screwed or welded plugs, so as to restore the continuity of the outer wall 4.
- the spacers 3 can be omitted, the method however being implemented under the same conditions.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Laminated Bodies (AREA)
- Furnace Housings, Linings, Walls, And Ceilings (AREA)
- Powder Metallurgy (AREA)
- Lining Or Joining Of Plastics Or The Like (AREA)
Description
La présente invention concerne, notamment, les cowpers de hauts-fourneaux, c'est-à-dire les appareils à inversion dans lesquels s'effectue le réchauffage de l'air envoyé aux tuyères des hauts-fourneaux.The present invention relates, in particular, to blast furnace cowpers, that is to say reversing devices in which the air sent to the blast furnace nozzles is heated.
Un tel appareil comprend une paroi latérale constituée de plaques de tôle soudée, surmontée d'une coupole également en tôle soudée. L'enceinte formée par la paroi latérale et la coupole abrite une chambre de combustion et une chambre de ruchage.Such an apparatus comprises a side wall consisting of welded sheet plates, surmounted by a dome also made of welded sheet. The enclosure formed by the side wall and the dome houses a combustion chamber and a ruching chamber.
Les conditions qui règnent dans les cowpers et en particulier les conditions de température (cette dernière pouvant dépasser 1300° dans certaines zones) provoquent fréquemment des incidents au niveau de leurs parois métalliques. On constate en effet après quelques années de fonctionnement l'apparition de fissures, en particulier au niveau du dôme et du puits de combustion. Ces fissures se développent à partir de la face interne de la paroi métallique, principalement à proximité des soudures, parallèlement ou transversalement à ces dernières. Elles sont dues à l'action corrosive des nitrates produits par les oxydes d'azote formés à haute température, dans des zones où les contraintes de traction subies par l'enveloppe métallique sont importantes. Il s'agit-donc d'un phénomène de corrosion fissurante sous tension.The conditions prevailing in cowpers and in particular the temperature conditions (the latter possibly exceeding 1300 ° in certain areas) frequently cause incidents at the level of their metal walls. In fact, after a few years of operation, there are the appearance of cracks, in particular at the level of the dome and of the combustion shaft. These cracks develop from the internal face of the metal wall, mainly near the welds, parallel or transverse to the latter. They are due to the corrosive action of the nitrates produced by the nitrogen oxides formed at high temperature, in areas where the tensile stresses undergone by the metallic envelope are significant. It is therefore a phenomenon of cracking corrosion under tension.
De tels incidents peuvent prendre des proportions importantes et nécessiter le remplacement complet de ces appareils, ce qui, d'une part, représente un coût extrêmement élevé et, d'autre part, entraîne une immobilisation pouvant avoir pour conséquence l'arrêt complet du haut-fourneau qu'ils desservent.Such incidents can take on significant proportions and require the complete replacement of these devices, which, on the one hand, represents an extremely high cost and, on the other hand, entails immobilization which can result in complete shutdown - oven they serve.
Pour pallier de tels incidents, on a proposé dans le brevet FR-2 526 810 de réaliser autour de la paroi du cowper une deuxième enveloppe et de remplir l'espace ainsi délimité par les deux enveloppes d'un matériau de remplissage à base de carbure de silicium et de graphite.To remedy such incidents, it has been proposed in patent FR-2,526,810 to produce a second envelope around the wall of the cowper and to fill the space thus delimited by the two envelopes with a carbide-based filling material. silicon and graphite.
Le but de la présente invention est de proposer un garnissage de la double enveloppe plus spécialement adapté aux contraintes thermiques à transmettre, tout en étant d'une mise en oeuvre aisée.The purpose of the present invention is to provide a lining of the double jacket more specially adapted to the thermal stresses to be transmitted, while being easy to implement.
A cet effet, l'invention a pour objet une enveloppe pour cowper ou appareil de réchauffage d'air analogue comprenant une première paroi réalisée en tôle soudée et comportant une deuxième paroi en tôle soudée, extérieure et parallèle à la première, ces deux parois délimitant un espace rempli d'un matériau de remplissage, caractérisé en ce que le matériau de remplissage est à base de grenaille d'un métal ou d'un alliage léger, noyée dans un liant à base de résine thermodurcissable.To this end, the subject of the invention is an envelope for a cowper or similar air heating device comprising a first wall made of welded sheet metal and comprising a second wall of welded sheet metal, external and parallel to the first, these two walls delimiting a space filled with a filling material, characterized in that the filling material is based on shot of a metal or a light alloy, embedded in a binder based on thermosetting resin.
L'invention a également pour objet un procédé de fabrication d'une telle enveloppe: dans lequel on double une paroi intérieure en tôle par une deuxième paroi extérieure en tôle, parallèle à la première, cette deuxième paroi délimitant avec la première paroi un espace, caractérisé en ce qu'on remplit cet espace avec un matériau de remplissage comprenant de la grenaille d'un métal ou d'un alliage léger et un liant à base de résine thermodurcissable.The invention also relates to a method of manufacturing such an envelope: in which an inner sheet metal wall is doubled by a second outer sheet metal wall, parallel to the first, this second wall delimiting with the first wall a space, characterized in that this space is filled with a filling material comprising shot of a metal or a light alloy and a binder based on thermosetting resin.
Suivant d'autres caractéristiques :
- - les particules métalliques ont des dimensions comprises entre 0,2 et 2 mm environ et, de préférence, entre 0,5 et 1,5 mm;
- - on utilise de l'aluminium ou un alliage à base d'aluminium.
- - The metallic particles have dimensions of between 0.2 and 2 mm approximately and, preferably, between 0.5 and 1.5 mm;
- - using aluminum or an aluminum-based alloy.
L'invention va être décrite plus en détail en se référant au dessin annexé, donné uniquement à titre d'exemple et sur lequel :
- - la Fig. 1 est une vue en coupe de l'enveloppe d'un cowper, réalisée suivant l'invention;
- - la Fig. 2 est également une vue en coupe montrant un exemple de réalisation dans le cas d'épaisseurs variables des parois.
- - Fig. 1 is a sectional view of the envelope of a cowper, produced according to the invention;
- - Fig. 2 is also a sectional view showing an exemplary embodiment in the case of variable wall thicknesses.
On voit sur la Fig. 1 une partie d'une enveloppe de cowper ou appareil analogue comprenant une paroi intérieure métallique 1 réalisée en tôle soudée dont l'épaisseur peut être comprise, par exemple entre 15 et 30 mm. Sur la face de cette paroi dirigée vers l'intérieur de l'appareil se trouve un revêtement réfractaire 2.We see in Fig. 1 a part of a cowper envelope or similar device comprising a metallic
Sur la face extérieure de cette tôle sont appuyées des bandes de tôle 3 disposées horizontalement et verticalement et qui sont soudées à une deuxième série de tôles constituant une paroi extérieure 4.On the external face of this sheet metal are supported
Entre les deux parois et les entretoises 3 sont délimités des alvéoles 5 remplis d'un matériau de remplissage 6.Between the two walls and the
La paroi extérieure est de préférence réalisée dans la même nuance d'acier que la paroi intérieure et présente une épaisseur à peu près comparable.The outer wall is preferably made in the same grade of steel as the inner wall and has a roughly comparable thickness.
A cet égard, dans le mode de réalisation de la Fig. 2 on aperçoit une zone de l'enveloppe dans laquelle les parois intérieures et extérieures ont des épaisseurs variables. La paroi intérieure comporte par exemple une partie inférieure 1a présentant une épaisseur de 24 mm et une partie supérieure 1 présentant une épaisseur de 17mm. L'épaisseur de la paroi extérieure 4a, 4b peut varier en conséquence, comme représenté sur le dessin. De même, l'épaisseur de l'intervalle 5a, 5b de limité entre les deux parois peut varier entre par exemple 3 et 30 mm, une épaisseur de l'ordre de 10 mm étant cependant préférée.In this regard, in the embodiment of FIG. 2 we can see an area of the envelope in which the interior and exterior walls have variable thicknesses. The inner wall comprises for example a lower part 1a having a thickness of 24 mm and an
Le matériau de remplissage de l'intervalle délimité entre les parois est, suivant l'invention, constitué par de la grenaille d'aluminium ou d'un alliage d'aluminium dont les particules ont de préférence les dimensions comprises entre 0,2 et 2 mm, par exemple, une dimension de l'ordre de 0,5 ou 1,5 mm étant particulièrement favorable. En fait, la dimension moyenne des granules métalliques est choisie de façon à obtenir un remplissage optimal des alvéoles et est, en tout état de cause, inférieure à la largeur minimale de l'intervalle entre les deux parois.The filling material of the gap between the walls is, according to the invention, constituted by aluminum shot or an aluminum alloy whose particles preferably have the dimensions between 0.2 and 2 mm, for example, a dimension of the order of 0.5 or 1.5 mm being particularly favorable. In fact, the average size of the metal granules is chosen so as to obtain optimal filling of the cells and is, in any event, less than the minimum width of the gap between the two walls.
En ce qui concerne la composition de cette grenaille métallique, on utilisera de l'aluminium ou de préférence un alliage à base d'aluminium ou un autre métal ou alliage léger à conductivité thermique élevée.Regarding the composition of this metallic shot, aluminum will be used or preferably an aluminum-based alloy or another metal or light alloy with high thermal conductivity.
Les interstices entre les granules métalliques sont remplis par un liant à base de résine ou d'un mélange de résine thermo-durcissable résistant à une température égale ou supérieure à 1100 C. Cette résine peut être par exemple une résine polyuréthane phénolique en poudre ou sous forme de gel liquide, contenant les adjuvants nécessaires à son durcissement et éventuellement une charge ainsi que cela est classique dans les techniques de moulage ou de coulée de telles résines.The interstices between the metal granules are filled with a binder based on resin or a mixture of thermosetting resin resistant to a temperature equal to or greater than 110 ° C. This resin can for example be a powdered phenolic polyurethane resin or in the form of a liquid gel, containing the adjuvants necessary for its hardening and possibly a filler as is conventional in the techniques of molding or casting of such resins.
Suivant un mode de mise en oeuvre, le remplissage des alvéoles peut être effectué de la façon suivante : on réalise tout d'abord dans un malaxeur un enrobage des particules métalliques, en utilisant la résine en poudre ou sous forme de gel liquide.According to one embodiment, the filling of the cells can be carried out as follows: first of all, in a mixer, the metal particles are coated, using the resin in powder or in the form of liquid gel.
Puis, on effectue la mise en place du mélange ainsi préparé, par injection ou par coulée, éventuellement sous gaz neutre tel que de l'azote, par des orifices 7 dans lesquels sont introduits par exemple par vissage, des tubulures telles que 8. Des trous d'évents sont prévus, si nécessaire dans cette même paroi 4. Cette mise en place du mélange peut s'effectuer à froid. Pendant cette opération de remplissage ou immédiatement après on effectue une opération de vibration de façon à obtenir un excellent remplissage des alvéoles. Cette opération peut être effectuée au moyen d'un vibreur unidirectionnel haute fréquence.Then, the mixture thus prepared is put into place, by injection or by pouring, optionally under neutral gas such as nitrogen, through orifices 7 into which tubes such as 8 are introduced, for example by screwing. vent holes are provided, if necessary in this
Le durcissage de la résine s'effectue entre 20 minutes et une heure environ après la mise en place du mélange, cette durée dépendant bien entendu des proportions de durcisseur contenues dans le mélange.The curing of the resin takes place between 20 minutes and one hour approximately after the introduction of the mixture, this duration naturally depending on the proportions of hardener contained in the mixture.
Ce durcissement peut éventuellement être accéléré par une légère augmentation de la température.This hardening can possibly be accelerated by a slight increase in temperature.
Les orifices tels que 7 sont ensuite obturés, par exemple au moyen de bouchons vissés ou soudés, de façon à rétablir la continuité de la paroi extérieure 4.The orifices such as 7 are then closed, for example by means of screwed or welded plugs, so as to restore the continuity of the
Ce type de remplissage est particulièrement intéressant. En effet :
- - sa bonne conductivité thermique permet d'éviter la formation d'un gradient de température élevé entre les deux parois et par conséquent de limiter les contraintes dûes à une dilatation différentielle;
- - les alvéoles entre les parois étant entièrement remplis en particulier du fait de la présence d'une résine qui comble les interstices entre les granules métalliques, on empêche la mise en pression de l'espace entre les parois et le passage de tout agent gazeux ou liquide agressif venant de l'enceinte du cowper vers la nouvelle enveloppe ;
- - le produit de remplissage utilisé n'est pas attaqué par les nitrates de sorte que la paroi extérieure se trouve isolée de ces derniers, même après fissuration de la paroi intérieure ;
- - le mélange introduit entre les parois a une faible densité, par exemple comprise entre 1,2 et 1,5, ce qui limite les charges et les efforts de traction exercés sur les tôles, ne nécessitant pas une augmentation de l'épaisseur des parois pour résister aux pressions et température régnant dans l'enceinte du cowper;
- - le procédé de mise en place est particulièrement simple puisque il n'est pas nécessaire de chauffer les parois ou si un tel chauffage est réalisé, il n'est effectué qu'à une température relativement faible de quelques dizaines de °C au-dessus de zéro.
- - Its good thermal conductivity makes it possible to avoid the formation of a high temperature gradient between the two walls and consequently to limit the stresses due to differential expansion;
- - the cells between the walls being completely filled in particular due to the presence of a resin which fills the interstices between the metal granules, the pressurization of the space between the walls and the passage of any gaseous agent is prevented or aggressive liquid from the cowper enclosure to the new envelope;
- - the filling product used is not attacked by nitrates so that the outer wall is isolated from them, even after cracking of the inner wall;
- - The mixture introduced between the walls has a low density, for example between 1.2 and 1.5, which limits the loads and the tensile forces exerted on the sheets, not requiring an increase in the thickness of the walls to withstand the pressures and temperature prevailing in the enclosure of the cowper;
- - the installation process is particularly simple since it is not necessary to heat the walls or if such heating is carried out, it is only carried out at a relatively low temperature of a few tens of ° C. above from zero.
En variante, les entretoises 3 peuvent être supprimées, le procédé étant cependant mis en oeuvre dans les mêmes conditions.Alternatively, the
Claims (8)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AT85400055T ATE30599T1 (en) | 1984-01-18 | 1985-01-11 | MANIFOLDS OF AIR HEATER OR IDENTICAL DEVICES. |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR8400746 | 1984-01-18 | ||
| FR8400746A FR2560215B1 (en) | 1984-01-18 | 1984-01-18 | IMPROVEMENT IN ENVELOPES FOR COWPERS OR THE LIKE |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP0149575A2 EP0149575A2 (en) | 1985-07-24 |
| EP0149575A3 EP0149575A3 (en) | 1985-08-28 |
| EP0149575B1 true EP0149575B1 (en) | 1987-11-04 |
Family
ID=9300246
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP85400055A Expired EP0149575B1 (en) | 1984-01-18 | 1985-01-11 | Improved shells for hot blast stoves or identical apparatus |
Country Status (11)
| Country | Link |
|---|---|
| EP (1) | EP0149575B1 (en) |
| JP (1) | JPS61500920A (en) |
| KR (1) | KR850700257A (en) |
| AR (1) | AR231843A1 (en) |
| AT (1) | ATE30599T1 (en) |
| BR (1) | BR8504777A (en) |
| CA (1) | CA1253687A (en) |
| DE (1) | DE3560907D1 (en) |
| ES (1) | ES8700329A1 (en) |
| FR (1) | FR2560215B1 (en) |
| WO (1) | WO1985003310A1 (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NL1006169C2 (en) * | 1997-05-30 | 1998-12-01 | Hoogovens Staal Bv | Refractory wall structure |
| ATE219155T1 (en) * | 1997-05-30 | 2002-06-15 | Corus Staal Bv | FIREPROOF WALL STRUCTURE |
| NL1008625C2 (en) * | 1998-03-18 | 1999-09-21 | Hoogovens Staal Bv | Wall construction for a metallurgical vessel and blast furnace provided with such a wall construction and metal beams for use therewith. |
| NZ601302A (en) * | 2010-01-19 | 2014-05-30 | Tega Ind Ltd | Mixing drum for a blast furnace |
| CN112537611B (en) * | 2020-11-26 | 2023-02-21 | 上海宝冶冶金工程有限公司 | Replacing device |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR1272483A (en) * | 1959-02-09 | 1961-09-29 | Air heating devices for blast or blast furnaces, with very active heat exchange gasket and shielded, sealed combustion chamber, with independent and undeformable insulation | |
| GB1442129A (en) * | 1973-01-17 | 1976-07-07 | British Aluminium Co Ltd | Containers for molten metal |
| DE2410657C3 (en) * | 1974-03-04 | 1979-11-29 | Mannesmann Ag, 4000 Duesseldorf | Arrangement of a plastic film between the sheet metal jacket and the brickwork of a heater to protect against intergranular stress corrosion and a method for producing the arrangement |
| FR2318933A1 (en) * | 1975-07-22 | 1977-02-18 | Inst Str Metallokon | Blast furnace stone with gas tight lining - obtd. by spray coating a gunite layer with metal or heat proof synthetics |
| DE2742109A1 (en) * | 1977-09-19 | 1979-04-12 | Eberhard Dipl Ing Boehmer | Wind heater for blast furnaces - has internal sheath made of high alloy steel preventing stress corrosion at high temps. |
| DE3218126C1 (en) * | 1982-05-14 | 1983-09-29 | Aktiengesellschaft der Dillinger Hüttenwerke, 6638 Dillingen | Blast heater for blast furnaces |
-
1984
- 1984-01-18 FR FR8400746A patent/FR2560215B1/en not_active Expired
-
1985
- 1985-01-11 DE DE8585400055T patent/DE3560907D1/en not_active Expired
- 1985-01-11 EP EP85400055A patent/EP0149575B1/en not_active Expired
- 1985-01-11 AT AT85400055T patent/ATE30599T1/en not_active IP Right Cessation
- 1985-01-14 AR AR299239A patent/AR231843A1/en active
- 1985-01-17 CA CA000472304A patent/CA1253687A/en not_active Expired
- 1985-01-18 BR BR8504777A patent/BR8504777A/en not_active IP Right Cessation
- 1985-01-18 KR KR1019850700202A patent/KR850700257A/en not_active Application Discontinuation
- 1985-01-18 ES ES540122A patent/ES8700329A1/en not_active Expired
- 1985-01-18 WO PCT/FR1985/000010 patent/WO1985003310A1/en unknown
- 1985-01-18 JP JP60500409A patent/JPS61500920A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| AR231843A1 (en) | 1985-03-29 |
| ES540122A0 (en) | 1986-10-16 |
| WO1985003310A1 (en) | 1985-08-01 |
| CA1253687A (en) | 1989-05-09 |
| ATE30599T1 (en) | 1987-11-15 |
| JPS61500920A (en) | 1986-05-08 |
| KR850700257A (en) | 1985-12-26 |
| EP0149575A3 (en) | 1985-08-28 |
| FR2560215A1 (en) | 1985-08-30 |
| BR8504777A (en) | 1985-12-24 |
| FR2560215B1 (en) | 1989-01-06 |
| ES8700329A1 (en) | 1986-10-16 |
| EP0149575A2 (en) | 1985-07-24 |
| DE3560907D1 (en) | 1987-12-10 |
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| BE513893A (en) |
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