WO2002021061A1 - Procede de rechauffage de produits metallurgiques - Google Patents
Procede de rechauffage de produits metallurgiques Download PDFInfo
- Publication number
- WO2002021061A1 WO2002021061A1 PCT/FR2001/002772 FR0102772W WO0221061A1 WO 2002021061 A1 WO2002021061 A1 WO 2002021061A1 FR 0102772 W FR0102772 W FR 0102772W WO 0221061 A1 WO0221061 A1 WO 0221061A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- oven
- products
- oxy
- burners
- burner
- Prior art date
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/34—Methods of heating
- C21D1/52—Methods of heating with flames
-
- 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
- F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
- F27B9/30—Details, accessories, or equipment peculiar to furnaces of these types
- F27B9/3005—Details, accessories, or equipment peculiar to furnaces of these types arrangements for circulating gases
-
- 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
- F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
- F27B9/30—Details, accessories, or equipment peculiar to furnaces of these types
- F27B9/36—Arrangements of heating devices
Definitions
- the present invention relates to a process for heating metallurgical products in which solid products, in particular steel, are heated to bring them from a temperature below substantially 400 ° C. to a temperature of at least approximately 1000 ° C. passage through an oven comprising an upstream zone in which said products are preheated and a downstream zone in which said products are brought to their final temperature at exit from the oven, the downstream zone of the oven being equipped with burners, at least some of which operate with an oxidizer which is air, the fumes generated by these burners circulating against the current of the products and coming to preheat them in the upstream preheating zone.
- Reheating furnaces in the steel industry are used to reheat steel products originating in particular from continuous casting and bring them to the rolling temperature which is of the order of 1000 to 1300 ° C.
- This preheating zone being followed by one or more heating zones, and the furnace ending in a so-called equalization zone which serves to ensure the temperature uniformity of the product at the outlet of the furnace.
- Burners can preferably be installed on either side of the product which circulates from the preheating zone until the end of the heating zone or zones. Such burners can also be placed in the roof of the oven (in the case of radiant arches) or in niches depending on the width of the oven.
- FIG. 1 shows the curve of the evolution of the temperature difference ⁇ T (defined below) during the heating of the product.
- the temperature difference ⁇ T will be the difference between the temperature of the upper surface of the product exposed to radiation from the oven and the temperature of the lower surface of the product in contact with the floor.
- the temperature difference ⁇ T will be the difference between the surface temperature and the temperature at the heart of the product.
- the position of the product in the oven is shown on the abscissa and the value of ⁇ T on the ordinate.
- ( ⁇ T i ⁇ i t ) can be zero, when the product is put in the oven at room temperature, or non-zero in the case of products whose temperature has not yet become homogeneous, for example in the case of treatment of metallurgical products little time after their development.
- X represents the position of the product in the oven, the abscissa 0 being the point for placing products in the oven, while X B is the abscissa for charging or leaving the oven.
- the temperature difference ⁇ T reaches its maximum ( ⁇ Tm ax ).
- This value ⁇ Tm ax must be as small as possible, because a large difference in temperature is equivalent to deformations of the product (buckling) which can cause a deterioration of the product or an impossibility of operation of the oven or an impossibility of rolling the product at the outlet. from the oven.
- operators must limit the power of the oven and / or the production of the oven to avoid the appearance of too large temperature differences ⁇ T, which is a major drawback for an industrialist.
- FIG. 2 illustrates the relationship between the temperature difference ⁇ T and the deflection, that is to say the vertical deformation of the product during its passage through the oven.
- ⁇ Tfj na ⁇ at the outlet of the oven.
- ⁇ T fl nai should be zero at the oven outlet (racking).
- ⁇ T fj na ⁇ which should not exceed about 100 ° C for billets and 200 ° C for slabs and blooms.
- a significant temperature difference in fact causes rolling difficulties which can go as far as mechanical incidents in certain stands of the rolling mill.
- any unevenness in temperature results in a drop in quality on the finished product. It is also an object of the present invention to reduce ⁇ T ⁇ na ⁇ of a product leaving a reheating oven without increasing the energy consumption in the oven.
- the process according to the invention consists in installing burners whose oxygen percentage in the oxidizer is greater than 21% vol. and less than or equal to 100% vol. (hereinafter referred to as "oxy-burner”), these burners being installed in the oven so that they are the first burners "seen” by the products to be treated during their progress in the oven, after they have been placed in the oven.
- the preheating zone constituted by these oxy-burners is therefore the first preheating zone of the oven.
- the invention therefore consists in placing oxy-burners in the zone of the furnace where the first burners must be placed (“first” with regard to the direction of travel in the furnace of the metallurgical product).
- the method according to the invention is characterized in that there is at least one burner in the upstream preheating zone of the oven, this burner being supplied by an oxidizer and a fuel, the oxidant containing more than 21% and preferably more 30% by volume of oxygen.
- Combustion and fuel can be supplied to the burner either by separate injection (from the injectors opening into the furnace) or by coaxial injection (burner coaxial multitubes)), either by oxidizer and fuel premix before injection into the burner and then the oven.
- the invention may include two alternative embodiments.
- the oxy-burners are installed in an area of the oven which did not initially have one.
- this may consist of the installation of oxy-fuel burners at the end of the so-called recovery furnace zone, just before the first heating zone (which normally includes aero fuel burners).
- the method according to the invention is characterized in that the proportion of oxygen in the oxidizer injected into said oxy-fuel burner is a function of the preheating temperature of existing air-fuel burners, the proportion of oxygen being chosen so that the thermal efficiency of said oxy-fuel burner is greater than the thermal efficiency of existing air-fuel burners.
- the method according to the invention is characterized in that the proportion of oxygen in the oxidizer injected into said burner is greater than or equal to 88% vol., Preferably greater than or equal to 95% vol.
- the method according to the invention is characterized in that the oxidant supplied to said at least one burner is a mixture of industrially pure oxygen and air.
- the method according to the invention is characterized in that the oxidant supplied to said at least one burner is a mixture oxygen from a VSA (Vacuum Sewing Adsorption System, well known to those skilled in the art) and air.
- VSA Vauum Sewing Adsorption System
- the method according to the invention is characterized in that the oxidizer injected into said at least one burner comprises from 1 to 5% of argon in flight.
- the molar mass and the density of argon being higher than those of oxygen respectively, the presence of argon in the oxidizer containing oxygen makes it possible to increase the momentum of the flame. This increase in momentum will give a more stable flame, less sensitive to transverse flows, closer to the metallurgical product to be heated and will therefore result in more efficient and more homogeneous heating of the product to be heated.
- FIG. 3 an example of implementation of the invention on a billet heating furnace.
- Figure 4 an example of implementation of the invention on a slab reheating oven.
- FIG. 5 an exemplary embodiment of the invention while maintaining a constant hourly production, showing a reduction in fuel consumption.
- FIG. 6 an exemplary embodiment of the invention in which the production of the furnace is increased while retaining the same temperature differences ⁇ T as during operation before implementation of the invention.
- FIG. 9 illustrates the implementation of the invention according to FIG. 3.
- the invention can be applied to different types of oven, whether these are new ovens on which the process of the invention can be directly installed or existing ovens which are then modified.
- one of the important parameters of the process according to the invention is to use as an oxidant in at least certain burners of the furnace, oxygen-enriched air, the oxygen percentage of which can vary depending on the desired goal.
- oxygen-enriched air the oxygen percentage of which can vary depending on the desired goal.
- the percentage of oxygen in the oxidizer may vary by more than 21% vol. at 100% vol.
- FIG. 7 represents the evolution of the yield and the volume of the fumes as a function of parameters such as the air preheating temperature, on the one hand, and the percentage of oxygen, on the other hand.
- the air preheating temperature when using air as oxidant, it is possible to find a percentage of oxygen in the oxidant which gives a better yield than 'with combustion in air. For example, if the preheating temperature of Pair is 300 ° C, any oxidizer whose% O2 is greater than 30% vol. (from Figure 7) will give better thermal efficiency, synonymous with energy savings.
- FIG. 8 represents the evolution of the smoke volume (in Nm3 / h per kW of fuel) as a function of the percentage of oxygen in the oxidizer.
- the volume of smoke when using air (“aero reference” in Figure 8) is valid regardless of the air preheating temperature.
- the use of pure oxygen as an oxidizer makes it possible to reduce the volume of smoke from 10.6 to 3 Nm3 / h, ie a reduction by a factor of 3.5. This reduction in the volume of smoke allows better operation of the recuperator which therefore allows the increase in the "draw" of the oven, as explained below.
- the volume of smoke in the oven is directly linked to the pressure in the oven (which must remain minimal): increasing the thermal power delivered to the oven by keeping the air as oxidizer would effectively mean an increase in the volume of smoke in the oven and therefore an increase in the pressure in the furnace which would generate risks of deterioration of the furnace, up to and including its destruction.
- the implementation of the invention can be carried out in different ways, according to the aim to be obtained, which will be explained below:
- the use of the invention with the same draw is achieved by installing oxy-burners in the area concerned by operating these oxy-burners at a given power (P oxy ) while reducing the power of the air gas burners of other heating zones with a power at least equal to the power of the P oxy oxy- burners but less than twice the P oxy power (P oxy ⁇ power reduction ⁇ 2P oxy .)
- the power of the aero-gas burners in the modified oven is then equal to the initial aero-gas power (before modification of the oven, i.e. P a ero ref ) minus ocPoxy, with 1 ⁇ ⁇ 2
- FIG. 5 which shows the theoretical variations of ⁇ T between an all aero combustion and a combustion, in the same oven, where certain burners have been replaced by burners with pure oxygen, it is noted that the two problems linked to the difference ⁇ T temperature are resolved.
- Hourly production can be increased by maintaining the values of DT and ax ⁇ Tfi na ⁇ e as they are in the furnace using a combustion in air only. This increase in hourly production can take place in two ways: increasing the rate of charging while keeping the size of the product warmed or keeping the rate of charging and increasing the size of the heated product.
- the implementation of the invention makes it possible to reduce ⁇ Tm ax and ⁇ Tfj na ⁇ and therefore again allows the increase in pull.
- the values ⁇ T ma ⁇ and ⁇ Tfi na ⁇ will return to their initial value, but the hourly production will have been increased, and this without additional energy consumption.
- Curve G represents the case of 100% air combustion (existing oven)
- curve H represents the same oven equipped with oxy-fuel burners allowing the increase in production
- curve I represents the same oven equipped with oxy-fuel burners allowing keep production constant but lower ⁇ T ma x and ⁇ Tfi ⁇ a ⁇ .
- FIG. 3 there is shown the implementation of the invention on a billet oven 1 with side members, the oven having a power of about 30 MW, a draw of 92 t / h.
- the oven consists of an upstream zone 5 constituting the first half of the oven and a downstream zone 6 occupying the second half of the oven.
- the products 8 enter the oven 1 through the inlet 2 and move from right to left in the figure, towards the outlet 3.
- the air-fuel burners of the downstream area 6 have been preserved, while several oxy-fuel burners 11 were installed on approximately half of the upstream zone 5 (half closest to the downstream zone 6).
- the fumes circulate from the outlet to the inlet, against the flow of products 8 which are thus preheated on contact.
- the fumes are evacuated through the chimney 4. The following results were obtained on this oven
- Example 2
- FIG. 4 represents another example of implementation of the invention with a slab reheating oven.
- the same elements as those in FIG. 3 have the same references.
- the upstream zone 5 of the oven already has a heating zone
- FIG. 4a By replacing the burners 10 (fig. 4a) with the burners 11 (fig. 4b), there is again a decrease in the ⁇ T of the products of around 30% for an increase in the draft of up to 50% if the total power consumption is retained.
- the arrangement of the burners 11 follows the rules set out above for the installation of the oxy-fuel burners.
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Crystallography & Structural Chemistry (AREA)
- Thermal Sciences (AREA)
- Physics & Mathematics (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Furnace Details (AREA)
- Forging (AREA)
- Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
- Disintegrating Or Milling (AREA)
- Resistance Heating (AREA)
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE60114653T DE60114653T2 (de) | 2000-09-08 | 2001-09-06 | VERFAHREN ZUM ERWÄRMEN METAlLURGISCHER PRODUKTE |
AT01967440T ATE308731T1 (de) | 2000-09-08 | 2001-09-06 | Verfahren zum erwärmen metallurgischer produkte |
AU2001287819A AU2001287819A1 (en) | 2000-09-08 | 2001-09-06 | Method for heating metallurgical products |
EP01967440A EP1322900B1 (fr) | 2000-09-08 | 2001-09-06 | Procede de rechauffage de produits metallurgiques |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR0011480A FR2813893B1 (fr) | 2000-09-08 | 2000-09-08 | Procede de rechauffage de produits metallurgiques |
FR0011480 | 2000-09-08 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2002021061A1 true WO2002021061A1 (fr) | 2002-03-14 |
Family
ID=8854113
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/FR2001/002772 WO2002021061A1 (fr) | 2000-09-08 | 2001-09-06 | Procede de rechauffage de produits metallurgiques |
Country Status (8)
Country | Link |
---|---|
US (1) | US6652681B2 (fr) |
EP (1) | EP1322900B1 (fr) |
CN (1) | CN1460170A (fr) |
AT (1) | ATE308731T1 (fr) |
AU (1) | AU2001287819A1 (fr) |
DE (1) | DE60114653T2 (fr) |
FR (1) | FR2813893B1 (fr) |
WO (1) | WO2002021061A1 (fr) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2829232A1 (fr) * | 2001-09-06 | 2003-03-07 | Air Liquide | Procede pour ameliorer le profil de temperature d'un four |
WO2007097663A1 (fr) * | 2006-02-26 | 2007-08-30 | Igor Mikhaylovich Distergeft | Procédés et dispositifs destinés au traitement thermique de métaux |
WO2009027593A1 (fr) * | 2007-08-31 | 2009-03-05 | Siemens Vai Metals Technologies Sas | Procede de mise en œuvre d'une ligne de recuit ou de galvanisation en continu d'une bande metallique |
DE102015009194A1 (de) | 2015-07-16 | 2017-01-19 | Messer Austria Gmbh | Vorrichtung und Verfahren zum Wiedererwärmen metallischer Produkte |
Families Citing this family (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
SE521170C2 (sv) * | 2002-02-22 | 2003-10-07 | Linde Ag | Förfarande för värmebehandling av rostfritt stål |
FR2854233B1 (fr) * | 2003-04-24 | 2005-06-03 | Air Liquide | Procede pour ameliorer les performances d'un four de rechauffage et four mettant en oeuvre ce procede |
SE527771C2 (sv) * | 2004-10-29 | 2006-05-30 | Aga Ab | Förfarande vid tillverkning av långsträckta stålprodukter |
SE529299C2 (sv) * | 2005-12-27 | 2007-06-26 | Aga Ab | Förfarande för att justera hårdheten hos en skivliknande metallprodukt |
US20070163387A1 (en) * | 2006-01-17 | 2007-07-19 | Rmi Titanium Company | Method and apparatus for preheating and feeding material |
DE102006005063A1 (de) * | 2006-02-03 | 2007-08-09 | Linde Ag | Verfahren zur Wärmebehandlung von Stahlbändern |
US20070231761A1 (en) * | 2006-04-03 | 2007-10-04 | Lee Rosen | Integration of oxy-fuel and air-fuel combustion |
SE531077C2 (sv) * | 2006-04-11 | 2008-12-09 | Aga Ab | Förfarande för värmning av metallmaterial |
ITBO20100248A1 (it) * | 2010-04-22 | 2011-10-23 | Siti B & T Group S P A | Forno per ceramiche ad efficienza migliorata |
US20150168067A1 (en) * | 2013-12-12 | 2015-06-18 | Rudiger Eichler | Method for heating a metal material in an industrial furnace |
EP2891859A1 (fr) * | 2013-12-12 | 2015-07-08 | Linde Aktiengesellschaft | Procédé pour chauffer un matériau métallique dans un four industriel |
CN108716852A (zh) * | 2018-06-13 | 2018-10-30 | 佛山市中晨窑炉设备有限公司 | 一种窑炉烧成氧化段二次燃烧系统 |
EP3839340A1 (fr) * | 2019-12-18 | 2021-06-23 | Linde GmbH | Procédé et système de chauffage d'un four |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2046595A5 (en) * | 1970-04-30 | 1971-03-05 | Nassheuer Jean Ind | Continuous ingot furnace for wires and - semi-finished products |
JPH09263836A (ja) * | 1996-03-28 | 1997-10-07 | Nippon Steel Corp | 連続加熱方法および装置 |
US5688339A (en) * | 1993-06-23 | 1997-11-18 | Gas Research Institute | Oxy-fuel flame impingement heating of metals |
EP1001237A1 (fr) * | 1998-11-10 | 2000-05-17 | L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude | Procédé de chauffage d'un four à chargement continu notamment pour produits sidérurgiques, et four de chauffage à chargement continu |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6071116A (en) * | 1997-04-15 | 2000-06-06 | American Air Liquide, Inc. | Heat recovery apparatus and methods of use |
US5954498A (en) * | 1998-02-26 | 1999-09-21 | American Air Liquide, Inc. | Oxidizing oxygen-fuel burner firing for reducing NOx emissions from high temperature furnaces |
US6454562B1 (en) * | 2000-04-20 | 2002-09-24 | L'air Liquide-Societe' Anonyme A' Directoire Et Conseil De Surveillance Pour L'etude Et L'exploitation Des Procedes Georges Claude | Oxy-boost control in furnaces |
-
2000
- 2000-09-08 FR FR0011480A patent/FR2813893B1/fr not_active Expired - Fee Related
-
2001
- 2001-09-06 WO PCT/FR2001/002772 patent/WO2002021061A1/fr active IP Right Grant
- 2001-09-06 DE DE60114653T patent/DE60114653T2/de not_active Expired - Lifetime
- 2001-09-06 AT AT01967440T patent/ATE308731T1/de not_active IP Right Cessation
- 2001-09-06 CN CN01815234A patent/CN1460170A/zh active Pending
- 2001-09-06 EP EP01967440A patent/EP1322900B1/fr not_active Expired - Lifetime
- 2001-09-06 AU AU2001287819A patent/AU2001287819A1/en not_active Abandoned
- 2001-09-07 US US09/948,037 patent/US6652681B2/en not_active Expired - Lifetime
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2046595A5 (en) * | 1970-04-30 | 1971-03-05 | Nassheuer Jean Ind | Continuous ingot furnace for wires and - semi-finished products |
US5688339A (en) * | 1993-06-23 | 1997-11-18 | Gas Research Institute | Oxy-fuel flame impingement heating of metals |
JPH09263836A (ja) * | 1996-03-28 | 1997-10-07 | Nippon Steel Corp | 連続加熱方法および装置 |
EP1001237A1 (fr) * | 1998-11-10 | 2000-05-17 | L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude | Procédé de chauffage d'un four à chargement continu notamment pour produits sidérurgiques, et four de chauffage à chargement continu |
Non-Patent Citations (1)
Title |
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PATENT ABSTRACTS OF JAPAN vol. 1998, no. 02 30 January 1998 (1998-01-30) * |
Cited By (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2829232A1 (fr) * | 2001-09-06 | 2003-03-07 | Air Liquide | Procede pour ameliorer le profil de temperature d'un four |
WO2003021174A1 (fr) * | 2001-09-06 | 2003-03-13 | L'air Liquide, Societe Anonyme A Directoire Et Conseil De Surveillance Pour L'etude Et L'exploitation Des Procedes Georges Claude | Procede pour ameliorer le profil de temperature d'un four |
CN100397021C (zh) * | 2001-09-06 | 2008-06-25 | 乔治洛德方法研究和开发液化空气有限公司 | 改善炉子温度分布的方法 |
WO2007097663A1 (fr) * | 2006-02-26 | 2007-08-30 | Igor Mikhaylovich Distergeft | Procédés et dispositifs destinés au traitement thermique de métaux |
AU2007218345B2 (en) * | 2006-02-26 | 2011-05-12 | Igor Mikhaylovich Distergeft | Metal heat treating methods and devices |
WO2009027593A1 (fr) * | 2007-08-31 | 2009-03-05 | Siemens Vai Metals Technologies Sas | Procede de mise en œuvre d'une ligne de recuit ou de galvanisation en continu d'une bande metallique |
FR2920438A1 (fr) * | 2007-08-31 | 2009-03-06 | Siemens Vai Metals Tech Sas | Procede de mise en oeuvre d'une ligne de recuit ou de galvanisation en continu d'une bande metallique |
US8568137B2 (en) | 2007-08-31 | 2013-10-29 | Siemens Vai Metals Technologies Sas | Method for operating a continuous annealing or galvanization line for a metal strip |
DE102015009194A1 (de) | 2015-07-16 | 2017-01-19 | Messer Austria Gmbh | Vorrichtung und Verfahren zum Wiedererwärmen metallischer Produkte |
WO2017009020A1 (fr) * | 2015-07-16 | 2017-01-19 | Messer Austria Gmbh | Dispositif et procédé pour réchauffer des produits métalliques |
Also Published As
Publication number | Publication date |
---|---|
FR2813893A1 (fr) | 2002-03-15 |
FR2813893B1 (fr) | 2003-03-21 |
DE60114653D1 (de) | 2005-12-08 |
ATE308731T1 (de) | 2005-11-15 |
CN1460170A (zh) | 2003-12-03 |
EP1322900A1 (fr) | 2003-07-02 |
DE60114653T2 (de) | 2006-08-10 |
AU2001287819A1 (en) | 2002-03-22 |
US6652681B2 (en) | 2003-11-25 |
US20020050670A1 (en) | 2002-05-02 |
EP1322900B1 (fr) | 2005-11-02 |
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