CA2587035A1 - Method and arrangement for heating extended steel products - Google Patents
Method and arrangement for heating extended steel products Download PDFInfo
- Publication number
- CA2587035A1 CA2587035A1 CA002587035A CA2587035A CA2587035A1 CA 2587035 A1 CA2587035 A1 CA 2587035A1 CA 002587035 A CA002587035 A CA 002587035A CA 2587035 A CA2587035 A CA 2587035A CA 2587035 A1 CA2587035 A1 CA 2587035A1
- Authority
- CA
- Canada
- Prior art keywords
- burner
- caused
- product
- oxidant
- fuel
- 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.)
- Abandoned
Links
Classifications
-
- 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
- F27B17/00—Furnaces of a kind not covered by any preceding group
-
- 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
-
- 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
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
- C21D9/54—Furnaces for treating strips or wire
- C21D9/56—Continuous furnaces for strip or wire
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
- F23D14/20—Non-premix gas burners, i.e. in which gaseous fuel is mixed with combustion air on arrival at the combustion zone
- F23D14/22—Non-premix gas burners, i.e. in which gaseous fuel is mixed with combustion air on arrival at the combustion zone with separate air and gas feed ducts, e.g. with ducts running parallel or crossing each other
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
- F23D14/46—Details, e.g. noise reduction means
- F23D14/48—Nozzles
- F23D14/56—Nozzles for spreading the flame over an area, e.g. for desurfacing of solid material, for surface hardening, or for heating workpieces
-
- 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
- C21D1/82—Descaling by thermal stresses
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Thermal Sciences (AREA)
- Physics & Mathematics (AREA)
- Crystallography & Structural Chemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Combustion & Propulsion (AREA)
- Gas Burners (AREA)
- Heat Treatment Of Strip Materials And Filament Materials (AREA)
- Heat Treatment Of Articles (AREA)
- Heat Treatments In General, Especially Conveying And Cooling (AREA)
Abstract
A method for heating extended steel products, such as pipes, tape or wire products or rods following working such as rolling or extrusion to a heat treatment temperature, normally to approximately 50 to 900 degrees Celsius.
The invention is characterised in that the heating is caused to take place through the product (9) being caused to be fed through a burner (1) that has a central through channel (2) into which the product is fed, in that fuel and oxidant are caused to be supplied through channels (4, 5) that exist outside of the said central channel (2), in that fuel and oxidant are caused to be supplied at such a rate that the combustion is caused to take place in front of the outlet opening (13) of the burner head (12) of the burner (1). The invention also relates to an arrangement.
The invention is characterised in that the heating is caused to take place through the product (9) being caused to be fed through a burner (1) that has a central through channel (2) into which the product is fed, in that fuel and oxidant are caused to be supplied through channels (4, 5) that exist outside of the said central channel (2), in that fuel and oxidant are caused to be supplied at such a rate that the combustion is caused to take place in front of the outlet opening (13) of the burner head (12) of the burner (1). The invention also relates to an arrangement.
Description
Method and arrangement for heating extended steel products.
The present invention relates to a method and an arrangement for heating extended steel products.
During working of steel products, the mechanical, metal-lographic and surface chemical properties of the material change. It may be necessary to change these properties before further working and/or use. Heat treatment is one method of changing the properties of the material. Heat treatment in-volves the heating of the material to a certain temperature, followed by its subsequent cooling.
The rate of heating depends on three factors, namely the supply of heat to the surface of the material, transfer of heat from the boundary layer to the surface of the material, and the conduction of heat in the material. The conduction of heat in the material is a material constant and for this reason it cannot be influenced, whereby the supply of heat and the transfer of heat in the boundary layer remain as processes to influence.
One problem during the heating of extended steel products is that the supply of energy should be even over the material surface of the product.
Another problem consists of the material surface of a product that is to be heated often having chemicals, such as roller oils, lubricating soap grease, rust protection oils, polymers and organic and/or inorganic particles. Such contaminants may give undesirable effects on the surface during heating or heat treatment, such as deposits on or in the heat treatment equipment, visual surface defects on the material and/or an influence on the surface properties of the ready material.
The present invention solves these problems.
The present invention thus relates to a method for heating extended steel products, such as pipes, tape or wire products or rods following working such as rolling or extrusion to a heat treatment temperature, normally to approximately 50 to 900 degrees Celsius, and it is characterised in that the heating is caused to take place through the product being caused to be fed through a burner that has a central through channel into which the product is fed, in that fuel and oxi-dant are caused to be supplied through channels that exist 15. outside of the said central channel, in that fuel and oxidant are caused to be supplied at such a rate that the combustion is caused to take place in front of the outlet opening of the burner head of the burner.
The invention also relates to an arrangement of the nature and having the principal features that are specified in claim 8.
The invention.is described in more detail below, partly in association with an embodiment of the invention shown in the attached drawing whe.re - Figure 1shows a section through a burner according to the present invention, and The present invention concerns the heating of extended steel products, such as pipes, tape or wire products or rods fol-lowing working such as rolling or extrusion to a heat treat RECTIFIED SHEET (RULE 91) ment temperature, normally to approximately 50 to 900 degrees Celsius.
According to the invention, the heating is caused to take place through the product being caused to be fed through a burner. The burner has a central through channel into which the product is fed. Fuel and oxidant are caused to be sup-plied through existing channels located outside of the said central channel. According to the invention, furthermore, fo fuel and oxidant are caused to be fed forwards at such a rate that combustion is caused to take place in front of the out-let opening of the burner head of the burner.
Figure 1 shows an arrangement in the form of a burner 1 for the heating of extended steel products.
The burner 1 has a central through channel 2 arranged such that the product is fed through the burner 1. The channel 2 comprises a tube 3. Furthermore, channels 4, 5 are present in the burner for the supply of fuel 6 and oxidant 7, located outside of the said central channel 2. The said channels for the supply of fuel and oxidant are, according to the inven-tion, arranged such that combustion takes place in front of the outlet opening of the burner head of the burner.
The material is caused according to one preferred embodiment to be fed through the burner in a direction that is opposite to the flow of the exhaust gases.
The material 9 is fed through the burner 1 in the direction of the arrow 10, while the exhaust gases flow in the direc-tion of the arrow 11. The combustion of the fuel thus takes place outside of the opening 13 of the head 12 of the burner 1.
It is preferred that fuel and oxidant are caused to be sup-plied at an angle of between 1 and 90 degrees to the longitu-dinal axis of the product.
According to one preferred embodiment, the flame is caused to be formed inside of a flame tube 14 that extends out from the outlet opening 13 of the burner and is concentric with the transport pathway of the product.
By passing the material through the burner, it is ensured that the energy supplied is evenly distributed along the periphery of the extended steel surface. There is a large heating intensity or heating power at the first point of contact, and this decreases away from the opening of the burner in a direction that is opposite to the motion of the material. The power of the pre-heating before the direct impingement of the flame can be varied by adapting the length of the flame tube. It is the length of the flame tunnel that is varied. The combustion process can be made "flameless" by the recirculation of exhaust gases that takes place in the flame tunnel.
According to another preferred embodiment, oxidant and fuel are caused to be fed out from the outlet opening 13 of the burner in a symmetrical manner with respect to the product.
Thus it is preferred that oxidant and fuel are caused to be fed out from the outlet opening of the burner evenly distrib-uted along the periphery of the product.
It is also preferred that the oxidant is caused to contain at least 85% oxygen by volume.
The heating time for the material in the furnace is consid-5 erably shortened through the higher transfer of heat, which ensures that the rate of feed of the material through the furnace can be considerably increased for a given furnace.
Furthermore, at least one of the combustion and the mechani-cal blowing away of deposits and oil residues, etc. is achieved by the direction of feed of the material being in a direction that is opposite to the flow of the exhaust gases.
The surface will in this way become free of combustion prod-ucts and other contaminants before further treatment, such as, for example, heat treatment, working, removal of oxide, etc.
In cross-section through a burner according to the invention, it is divided into two halves along its longitudinal axis.
One half can be displaced relative to the other half by means of a force-producing means. The construction of the burner in a divided form ensures the advantage that the extended steel product does not need to be threaded through the burner dur-ing the start-up procedure.
It is thus apparent that the present invention solves the , problems that have been described in the introductory part.
RECTIFIED SHEET (RULE 91) A number of embodiments have been described above. It is, however, clear that the detailed design of the burner can be varied and optimised for a particular steel product.
Thus the present invention is not to be considered as being limited to the embodiments specified above, since it can be varied within the scope of the attached claims.
The present invention relates to a method and an arrangement for heating extended steel products.
During working of steel products, the mechanical, metal-lographic and surface chemical properties of the material change. It may be necessary to change these properties before further working and/or use. Heat treatment is one method of changing the properties of the material. Heat treatment in-volves the heating of the material to a certain temperature, followed by its subsequent cooling.
The rate of heating depends on three factors, namely the supply of heat to the surface of the material, transfer of heat from the boundary layer to the surface of the material, and the conduction of heat in the material. The conduction of heat in the material is a material constant and for this reason it cannot be influenced, whereby the supply of heat and the transfer of heat in the boundary layer remain as processes to influence.
One problem during the heating of extended steel products is that the supply of energy should be even over the material surface of the product.
Another problem consists of the material surface of a product that is to be heated often having chemicals, such as roller oils, lubricating soap grease, rust protection oils, polymers and organic and/or inorganic particles. Such contaminants may give undesirable effects on the surface during heating or heat treatment, such as deposits on or in the heat treatment equipment, visual surface defects on the material and/or an influence on the surface properties of the ready material.
The present invention solves these problems.
The present invention thus relates to a method for heating extended steel products, such as pipes, tape or wire products or rods following working such as rolling or extrusion to a heat treatment temperature, normally to approximately 50 to 900 degrees Celsius, and it is characterised in that the heating is caused to take place through the product being caused to be fed through a burner that has a central through channel into which the product is fed, in that fuel and oxi-dant are caused to be supplied through channels that exist 15. outside of the said central channel, in that fuel and oxidant are caused to be supplied at such a rate that the combustion is caused to take place in front of the outlet opening of the burner head of the burner.
The invention also relates to an arrangement of the nature and having the principal features that are specified in claim 8.
The invention.is described in more detail below, partly in association with an embodiment of the invention shown in the attached drawing whe.re - Figure 1shows a section through a burner according to the present invention, and The present invention concerns the heating of extended steel products, such as pipes, tape or wire products or rods fol-lowing working such as rolling or extrusion to a heat treat RECTIFIED SHEET (RULE 91) ment temperature, normally to approximately 50 to 900 degrees Celsius.
According to the invention, the heating is caused to take place through the product being caused to be fed through a burner. The burner has a central through channel into which the product is fed. Fuel and oxidant are caused to be sup-plied through existing channels located outside of the said central channel. According to the invention, furthermore, fo fuel and oxidant are caused to be fed forwards at such a rate that combustion is caused to take place in front of the out-let opening of the burner head of the burner.
Figure 1 shows an arrangement in the form of a burner 1 for the heating of extended steel products.
The burner 1 has a central through channel 2 arranged such that the product is fed through the burner 1. The channel 2 comprises a tube 3. Furthermore, channels 4, 5 are present in the burner for the supply of fuel 6 and oxidant 7, located outside of the said central channel 2. The said channels for the supply of fuel and oxidant are, according to the inven-tion, arranged such that combustion takes place in front of the outlet opening of the burner head of the burner.
The material is caused according to one preferred embodiment to be fed through the burner in a direction that is opposite to the flow of the exhaust gases.
The material 9 is fed through the burner 1 in the direction of the arrow 10, while the exhaust gases flow in the direc-tion of the arrow 11. The combustion of the fuel thus takes place outside of the opening 13 of the head 12 of the burner 1.
It is preferred that fuel and oxidant are caused to be sup-plied at an angle of between 1 and 90 degrees to the longitu-dinal axis of the product.
According to one preferred embodiment, the flame is caused to be formed inside of a flame tube 14 that extends out from the outlet opening 13 of the burner and is concentric with the transport pathway of the product.
By passing the material through the burner, it is ensured that the energy supplied is evenly distributed along the periphery of the extended steel surface. There is a large heating intensity or heating power at the first point of contact, and this decreases away from the opening of the burner in a direction that is opposite to the motion of the material. The power of the pre-heating before the direct impingement of the flame can be varied by adapting the length of the flame tube. It is the length of the flame tunnel that is varied. The combustion process can be made "flameless" by the recirculation of exhaust gases that takes place in the flame tunnel.
According to another preferred embodiment, oxidant and fuel are caused to be fed out from the outlet opening 13 of the burner in a symmetrical manner with respect to the product.
Thus it is preferred that oxidant and fuel are caused to be fed out from the outlet opening of the burner evenly distrib-uted along the periphery of the product.
It is also preferred that the oxidant is caused to contain at least 85% oxygen by volume.
The heating time for the material in the furnace is consid-5 erably shortened through the higher transfer of heat, which ensures that the rate of feed of the material through the furnace can be considerably increased for a given furnace.
Furthermore, at least one of the combustion and the mechani-cal blowing away of deposits and oil residues, etc. is achieved by the direction of feed of the material being in a direction that is opposite to the flow of the exhaust gases.
The surface will in this way become free of combustion prod-ucts and other contaminants before further treatment, such as, for example, heat treatment, working, removal of oxide, etc.
In cross-section through a burner according to the invention, it is divided into two halves along its longitudinal axis.
One half can be displaced relative to the other half by means of a force-producing means. The construction of the burner in a divided form ensures the advantage that the extended steel product does not need to be threaded through the burner dur-ing the start-up procedure.
It is thus apparent that the present invention solves the , problems that have been described in the introductory part.
RECTIFIED SHEET (RULE 91) A number of embodiments have been described above. It is, however, clear that the detailed design of the burner can be varied and optimised for a particular steel product.
Thus the present invention is not to be considered as being limited to the embodiments specified above, since it can be varied within the scope of the attached claims.
Claims (10)
1. A method for heating extended steel products, such as pipes, tape or wire products or rods following working such as rolling or extrusion to a heat treatment temperature, normally to approximately 50 to 900 degrees Celsius, c h a r-a c t e r i s e d in that the heating is caused to take place through the product (9) being caused to be fed through a burner (1) that has a central through channel (2) into which the product is fed, in that fuel and oxidant are caused to be supplied through channels (4, 5) that exist outside of the said central channel (2), in that fuel and oxidant are caused to be supplied at such a rate that the combustion is caused to take place in front of the outlet opening (13) of the burner head (12) of the burner (1).
2 . A method according to claim 1, c h a r a c t e r i s e d in that the product (9) is caused to be fed through the burner in a direction that is opposite to the direction of flow of the exhaust gases of the burner.
3 . A method according to claim 1 or 2 , characterised i n that oxidant and fuel are caused to be fed out from the outlet opening (13) of the burner in a symmetrical manner with respect to the product (9).
4 . A method according to claim 3, characterised in that oxidant and fuel are caused to be fed out from the out-let opening (13) of the burner evenly distributed along the periphery of the product (9).
5. A method according to claim 1, 2, 3 or 4, character-ised in that fuel and oxidant are supplied at an angle that lies between 1 and 90 degrees to the longitudinal axis of the product (9).
6. A method according to claim 1, 2, 3, 4, or 5, charac-terised in that the oxidant is caused to contain at least 85% oxygen by volume.
7 . A method according to claim 1 , 2 , 3, 4 , 5 or 6, char-acterised in that the flame is caused to be formed within a flame tube (14) that extends out from the outlet opening (13) of the burner (1) and is concentric with the transport pathway of the product (9).
8. An arrangement for heating extended steel products, such as pipes, tape or wire products or rods following working such as rolling or extrusion to a heat treatment temperature, normally to approximately 50 to 900 degrees Celsius, char -acterised by a burner (1) that has a central through channel (2) arranged for the feed of the product (9) through the burner (1), by channels (4, 5) in the burner (1) for the supply of fuel and oxidant, which channels (4, 5) are located outside of the said central channel, by the arrangement of the said channels (4, 5) for the supply of fuel and oxidant such that combustion takes place in front of the outlet open-ing (13) of the burner head (12) of the burner.
9. An arrangement according to claim 8, characterised i n that the product (9) is arranged to be fed through the burner (1) in a direction that is opposite to the direction of flow of the exhaust gases of the burner (1).
10. The arrangement according to claim- 8 or 9, charac-terised in that the outlet opening (13 ) of the burner is arranged to supply fuel and oxidant at an angle that lies between 1 and 90 degrees to the longitudinal axis of the product (9).
Applications Claiming Priority (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SE0402622A SE527771C2 (en) | 2004-10-29 | 2004-10-29 | Procedure for the manufacture of elongated steel products |
| SE0402622-5 | 2004-10-29 | ||
| SE0402864-3 | 2004-11-24 | ||
| SE0402864A SE528138C2 (en) | 2004-10-29 | 2004-11-24 | Method and apparatus for heating elongated steel products |
| PCT/SE2005/001613 WO2006046919A1 (en) | 2004-10-29 | 2005-10-27 | Method and arrangement for heating extended steel products. |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2587035A1 true CA2587035A1 (en) | 2006-05-04 |
Family
ID=36228081
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002587035A Abandoned CA2587035A1 (en) | 2004-10-29 | 2005-10-27 | Method and arrangement for heating extended steel products |
Country Status (9)
| Country | Link |
|---|---|
| US (1) | US20090174125A1 (en) |
| EP (1) | EP1812608A1 (en) |
| JP (1) | JP2008518106A (en) |
| KR (1) | KR20070073910A (en) |
| BR (1) | BRPI0516668A (en) |
| CA (1) | CA2587035A1 (en) |
| MX (1) | MX2007004849A (en) |
| SE (1) | SE528138C2 (en) |
| WO (1) | WO2006046919A1 (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU2008210495B2 (en) * | 2007-01-30 | 2014-02-27 | Bp Corporation North America, Inc. | Enzymes for the treatment of lignocellulosics, nucleic acids encoding them and methods for making and using them |
| CN102031360B (en) * | 2010-10-14 | 2012-08-08 | 浙江佰耐钢带有限公司 | Steel belt direct electrical continuous heater of pressure plate electrode |
| EP3314028B1 (en) | 2015-06-24 | 2020-01-29 | Novelis Inc. | Fast response heaters and associated control systems used in combination with metal treatment furnaces |
| KR102437565B1 (en) * | 2015-11-27 | 2022-08-29 | 삼성전자주식회사 | Method for manufacturing semiconductor package having heat slug and method for manufacturing heat slug |
| US20210213510A1 (en) * | 2020-01-10 | 2021-07-15 | TE Connectivity Services Gmbh | Heated guide track for a press machine for manufacturing a strip |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3721520A (en) | 1971-09-02 | 1973-03-20 | Selas Corp Of America | Galvanizing wire |
| JPS5632877Y2 (en) * | 1977-04-30 | 1981-08-04 | ||
| JP4877680B2 (en) | 2001-03-28 | 2012-02-15 | 東京瓦斯株式会社 | Wire heating furnace |
-
2004
- 2004-11-24 SE SE0402864A patent/SE528138C2/en not_active IP Right Cessation
-
2005
- 2005-10-27 EP EP05796302A patent/EP1812608A1/en not_active Withdrawn
- 2005-10-27 US US10/563,390 patent/US20090174125A1/en not_active Abandoned
- 2005-10-27 BR BRPI0516668-3A patent/BRPI0516668A/en not_active Application Discontinuation
- 2005-10-27 JP JP2007538860A patent/JP2008518106A/en not_active Abandoned
- 2005-10-27 MX MX2007004849A patent/MX2007004849A/en unknown
- 2005-10-27 CA CA002587035A patent/CA2587035A1/en not_active Abandoned
- 2005-10-27 WO PCT/SE2005/001613 patent/WO2006046919A1/en active Application Filing
- 2005-10-27 KR KR1020077011037A patent/KR20070073910A/en not_active Application Discontinuation
Also Published As
| Publication number | Publication date |
|---|---|
| BRPI0516668A (en) | 2008-09-16 |
| MX2007004849A (en) | 2008-10-24 |
| KR20070073910A (en) | 2007-07-10 |
| SE528138C2 (en) | 2006-09-12 |
| SE0402864D0 (en) | 2004-11-24 |
| JP2008518106A (en) | 2008-05-29 |
| WO2006046919A1 (en) | 2006-05-04 |
| SE0402864L (en) | 2006-04-30 |
| EP1812608A1 (en) | 2007-08-01 |
| US20090174125A1 (en) | 2009-07-09 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Discontinued |