CN110218857B - Oxidation color strip steel annealing and decoloring device and oxidation color strip steel annealing and decoloring method - Google Patents
Oxidation color strip steel annealing and decoloring device and oxidation color strip steel annealing and decoloring method Download PDFInfo
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- 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
- C21D1/26—Methods of annealing
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- 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
- C21D1/74—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material
- C21D1/76—Adjusting the composition of the atmosphere
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- 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
- C21D11/00—Process control or regulation for heat treatments
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- 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
- C21D9/561—Continuous furnaces for strip or wire with a controlled atmosphere or vacuum
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- 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
- C21D9/573—Continuous furnaces for strip or wire with cooling
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Abstract
The invention provides an oxidation color strip steel annealing and decoloring device applied to the technical field of metallurgical industrial production, and also relates to an oxidation color strip steel annealing and decoloring method, wherein an annealing and decoloring furnace body (1) of the oxidation color strip steel annealing and decoloring device comprises a furnace body fast cooling section (10), a nitrogen-hydrogen mixed gas conveying pipeline (11) of a nitrogen-hydrogen mixing station (2) extends to the furnace body fast cooling section (10), a secondary hydrogen supply pipe (14) arranged on a hydrogen supply pipeline (4) is provided with a plurality of hydrogen supply branch pipes (15), and each hydrogen supply branch pipe (15) respectively extends into the furnace body fast cooling section (10). The waste of the strip is avoided, and the cost reduction and the efficiency improvement are effectively realized.
Description
Technical Field
The invention belongs to the technical field of metallurgical industrial production, and particularly relates to an oxidative color strip steel annealing and decoloring device and an oxidative color strip steel annealing and decoloring method.
Background
In the cold rolling continuous annealing production, because of the open-furnace maintenance, the treatment of the band steel which is out of order and is stopped in a fault and the restart of the produced band steel, the surface of the band steel is oxidized due to the high oxygen content in the furnace, and the band steel presents oxidation color; and in addition, the gas (oxygen) and water are slightly leaked into the furnace, and the surface of the strip steel is oxidized to present an oxidation color under the high-temperature condition. Including some steel coils with long standing time and oxidized surfaces. These oxidized colored steel strips are waste products that are typically disposed of as scrap steel. This results in a waste of strip material.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: aiming at the defects of the prior art, the oxidation color strip steel annealing and decoloring device has a simple structure, can conveniently and reliably perform annealing and decoloring treatment on strip steel with surface oxidation color inevitably generated during the production period of cold rolling continuous annealing, ensures that the surface quality and the mechanical property of unqualified strip steel products are qualified, avoids strip waste, and realizes cost reduction and efficiency improvement.
To solve the technical problems, the invention adopts the technical scheme that:
the invention relates to an oxidation color strip steel annealing and decoloring device, which comprises an annealing and decoloring furnace body and a nitrogen-hydrogen mixing station, wherein a nitrogen supply pipeline and a hydrogen supply pipeline are respectively communicated with the nitrogen-hydrogen mixing station, an upper furnace roller and a lower furnace roller are arranged in the annealing and decoloring furnace body, strip steel to be processed entering an inlet of the furnace body is arranged into a structure which can sequentially bypass the lower furnace roller and the upper furnace roller and then extend to the outside of an outlet of the furnace body, the annealing and decoloring furnace body comprises a furnace body fast cooling section, a nitrogen-hydrogen mixed gas conveying pipeline of the nitrogen-hydrogen mixing station extends to the furnace body fast cooling section in the annealing and decoloring furnace body, a plurality of fans are arranged outside the annealing and decoloring furnace body fast cooling section, a plurality of air boxes are arranged in the furnace body fast cooling section, a secondary hydrogen supply pipeline is arranged on the hydrogen supply pipeline, a plurality of hydrogen supply branch pipes are arranged on the secondary hydrogen supply pipeline, and each hydrogen supply, one end of each hydrogen supply branch pipe extending into the furnace body fast cooling section is respectively close to one air box.
The annealing and decoloring furnace body is characterized in that a plurality of bellows are arranged in a furnace body quick cooling section of the annealing and decoloring furnace body, each bellows is connected with a fan positioned outside the annealing and decoloring furnace body, the inner wall of one side of the annealing and decoloring furnace body, which is close to the annealing and decoloring furnace body, in the furnace body quick cooling section is provided with a plurality of bellows according to gaps, and the inner wall of the other side of the annealing and decoloring furnace body, which is close to the annealing and decoloring furnace body, in the.
When the strip steel to be treated entering the inlet of the furnace body passes through the outlet of the furnace body after sequentially bypassing the lower furnace roller and the upper furnace roller, one side of the strip steel to be treated passing through the fast cooling section of the furnace body is set to be a structure capable of sequentially passing through a plurality of bellows, the other side of the strip steel to be treated passing through the fast cooling section of the furnace body is set to be a structure capable of sequentially passing through the plurality of bellows, and a plurality of heat exchangers are arranged in the fast cooling section of the furnace body.
The annealing and decoloring furnace body is internally provided with a furnace atmosphere detector, the intracranial atmosphere detector is connected with a control part, each fan is respectively connected with the control part, a hydrogen stop valve is arranged on the secondary hydrogen supply pipe and is an electromagnetic hydrogen stop valve, and the hydrogen stop valve is connected with the control part capable of controlling the opening and closing of the hydrogen stop valve.
When the control component controls the hydrogen stop valve to be opened, the hydrogen supply pipeline is set into a structure capable of supplying hydrogen to different parts in the furnace body fast cooling section through the secondary hydrogen supply pipe and the plurality of hydrogen supply branch pipes; the second-stage hydrogen supply pipe is also provided with a hydrogen regulating valve, and the hydrogen regulating valve is connected with a control part capable of controlling the opening size of the hydrogen regulating valve to be regulated.
The nitrogen-hydrogen mixed gas conveying pipeline is provided with a nitrogen-hydrogen mixed gas conveying electromagnetic cut-off valve, and the nitrogen-hydrogen mixed gas conveying electromagnetic cut-off valve is connected with the control part; the upper furnace roller is connected with a driving motor, the upper furnace roller and the lower furnace roller are connected through a belt or a chain, and the driving motor is connected with a control component.
When the nitrogen-hydrogen mixed gas conveying pipeline injects the nitrogen-hydrogen mixed gas into the furnace body fast cooling section of the annealing and decoloring furnace body, the part ratio of hydrogen to nitrogen in the nitrogen-hydrogen mixed gas is controlled within the range of 1:18-1: 21.
The in-furnace atmosphere detector is set to be of a structure capable of detecting oxygen content, hydrogen content and dew point numerical values in a furnace body fast cooling section of the annealing and decoloring furnace body in real time, and when the in-furnace atmosphere detector detects that the hydrogen content in the furnace body fast cooling section reaches 8% -10%, the control part is set to be of a structure capable of controlling the opening of the hydrogen regulating valve to be in a fixed state.
When the furnace atmosphere detector detects that the hydrogen content in the furnace body quick cooling section of the annealing and decoloring furnace body is less than 8%, the control part is set to be of a structure capable of controlling the opening of the hydrogen regulating valve to be increased, and when the furnace atmosphere detector detects that the hydrogen content in the furnace body quick cooling section of the annealing and decoloring furnace body 1 is more than 10%, the control part is set to be of a structure capable of controlling the opening of the hydrogen regulating valve to be reduced.
The invention also relates to a method for annealing and decoloring the strip steel, which has simple steps, can conveniently and reliably anneal and decolor the strip steel with the surface oxidation color inevitably generated during the production period of the cold rolling continuous annealing, ensures that the surface quality and the mechanical property of unqualified strip steel products are qualified, avoids the waste of strips and realizes the cost reduction and the efficiency improvement of the annealing and decoloring of the oxidation color strip steel.
The annealing and decoloring steps of the oxidation color strip steel annealing and decoloring method are as follows: 1) the control part 16 controls the hydrogen stop valve 17 to be opened, controls the nitrogen-hydrogen mixed gas conveying pipeline 11 to be opened, starts the fan 12, starts the motor to drive the upper furnace roller 5 and the lower furnace roller 6 to rotate, and the strip steel 8 to be processed entering the furnace body inlet 7 continuously bypasses the lower furnace roller 6 and the upper furnace roller 5 in sequence and then extends to the furnace body outlet 9; 2) the control part 16 controls a plurality of hydrogen supply branch pipes 15 of the secondary hydrogen supply pipe 14 to inject hydrogen into different parts inside the furnace body quick cooling section 10 of the annealing and decoloring furnace body 1, the hydrogen carries out reduction and decoloring on the strip steel 8 to be processed, and meanwhile, the nitrogen-hydrogen mixed gas conveying pipeline 11 injects nitrogen-hydrogen mixed gas into the furnace body quick cooling section 10 of the annealing and decoloring furnace body 1 to protect the strip steel 8 to be processed passing through the annealing and decoloring furnace body 1 from being oxidized and simultaneously carry out reduction on the strip steel to be processed; 3) when the furnace atmosphere detector 19 detects that the hydrogen content in the furnace body fast cooling section 10 reaches 8% -10%, the control part 16 controls the opening of the hydrogen regulating valve 20 to be in a fixed state; 4) when the furnace atmosphere detector 19 detects that the hydrogen content in the furnace body fast cooling section 10 of the annealing and decoloring furnace body 1 is less than 8%, the control part 16 controls the opening of the hydrogen regulating valve 20 to increase, and when the furnace atmosphere detector 19 detects that the hydrogen content in the furnace body fast cooling section 10 of the annealing and decoloring furnace body 1 is more than 10%, the control part 16 controls the opening of the hydrogen regulating valve 20 to decrease; 5) the above steps are continued, so that the strip steel 8 to be treated can be subjected to decolorization and reduction treatment in batches.
By adopting the technical scheme of the invention, the following beneficial effects can be obtained:
the invention relates to an oxidative color strip steel annealing and decoloring device and an oxidative color strip steel annealing and decoloring method, which are characterized in that on the basis of the existing equipment, quick cooling section equipment of an annealing furnace is transformed to form an annealing and decoloring furnace body and realize the matching of related components, so that unqualified oxidative color strip steel is concentrated on line, and when strip steel to be treated passes through the quick cooling section of the furnace body of the annealing and decoloring furnace body, annealing and decoloring treatment can be reliably realized, so that iron oxide on the surface of the strip steel is reduced and decolored into iron under the high-temperature and high-hydrogen conditions and becomes qualified products. The annealing and decoloring steps of the oxidation color strip steel annealing and decoloring method are as follows: the control part controls the hydrogen stop valve to be opened, controls the nitrogen-hydrogen mixed gas conveying pipeline to be opened, starts the fan, starts the motor to drive the upper furnace roller and the lower furnace roller to rotate, and the strip steel to be treated entering the furnace body inlet continuously and sequentially bypasses the lower furnace roller and the upper furnace roller and then extends to the furnace body outlet; the control part controls a plurality of hydrogen supply branch pipes of the secondary hydrogen supply pipe to inject hydrogen into different parts inside a furnace body quick cooling section of the annealing and decoloring furnace body, the hydrogen carries out reduction decoloring on the strip steel to be processed, and meanwhile, a nitrogen-hydrogen mixed gas conveying pipeline injects nitrogen-hydrogen mixed gas into the furnace body quick cooling section of the annealing and decoloring furnace body to protect the strip steel to be processed passing through the annealing and decoloring furnace body from being oxidized and simultaneously carry out reduction on the strip steel to be processed; when the furnace atmosphere detector detects that the hydrogen content in the furnace body fast cooling section reaches 8% -10%, the control part controls the opening of the hydrogen regulating valve to be in a fixed state; when the furnace atmosphere detector detects that the hydrogen content in the furnace body fast cooling section of the annealing and decoloring furnace body is less than 8%, the control part controls the opening of the hydrogen regulating valve to be increased, and when the furnace atmosphere detector detects that the hydrogen content in the furnace body fast cooling section of the annealing and decoloring furnace body is more than 10%, the control part controls the opening of the hydrogen regulating valve to be decreased; and the steps are continued, so that the strip steel to be treated can be subjected to decoloration reduction treatment in batches. The oxidation color strip steel annealing and decoloring device and the oxidation color strip steel annealing and decoloring method have the advantages that the device structure is simple, the method steps are simple, the strip steel annealing and decoloring treatment of surface oxidation colors inevitably generated during the cold rolling continuous annealing production period can be conveniently and reliably carried out, the surface quality and the mechanical property of unqualified strip steel products are qualified, the waste of strips is avoided, and the cost reduction and the efficiency improvement are effectively realized.
Drawings
The contents of the description and the references in the drawings are briefly described as follows:
FIG. 1 is a schematic structural diagram of an oxidation color strip steel annealing and decoloring device according to the present invention;
in the drawings, the reference numbers are respectively: 1. annealing and decoloring the furnace body; 2. a nitrogen-hydrogen mixing station; 3. a nitrogen gas supply line; 4. a hydrogen gas supply line; 5. feeding the furnace roller; 6. a furnace roller is arranged; 7. a furnace body inlet; 8. strip steel to be treated; 9. a furnace body outlet; 10. a furnace body rapid cooling section; 11. a nitrogen-hydrogen mixed gas conveying pipeline; 12. a fan; 13. an air box; 14. a secondary hydrogen supply pipe; 15. a hydrogen supply branch pipe; 16. a control component; 17. a hydrogen shut-off valve; 18. a heat exchanger; 19. a furnace atmosphere detector; 20. a hydrogen regulating valve; 21. a nitrogen-hydrogen mixed gas delivery electromagnetic cut-off valve; 22. and a furnace waste gas bleeding valve.
Detailed Description
The following detailed description of the embodiments of the present invention, such as the shapes and structures of the components, the mutual positions and connection relations among the components, the functions and operation principles of the components, will be made by referring to the accompanying drawings and the description of the embodiments:
as shown in the attached figure 1, the invention relates to an oxidation color strip steel annealing and decoloring device, which comprises an annealing and decoloring furnace body 1 and a nitrogen-hydrogen mixing station 2, wherein a nitrogen supply pipeline 3 and a hydrogen supply pipeline 4 are respectively communicated with the nitrogen-hydrogen mixing station 2, an upper furnace roller 5 and a lower furnace roller 6 are arranged in the annealing and decoloring furnace body 1, a strip steel 8 to be processed entering a furnace body inlet 7 is arranged into a structure which can sequentially bypass the lower furnace roller 6 and the upper furnace roller 5 and then extend to the outside of a furnace body outlet 9, the annealing and decoloring furnace body 1 comprises a furnace body fast cooling section 10, a nitrogen-hydrogen mixed gas conveying pipeline 11 of the nitrogen-hydrogen mixing station 2 extends to a furnace body fast cooling section 10 in the annealing and decoloring furnace body 1, a plurality of fans 12 are arranged outside the annealing and decoloring furnace body 1, a plurality of air boxes 13 are arranged inside the furnace body fast cooling section 10, and a secondary hydrogen supply pipe 14 is arranged on the hydrogen, the secondary hydrogen supply pipe 14 is provided with a plurality of hydrogen supply branch pipes 15, each hydrogen supply branch pipe 15 extends into the furnace body fast cooling section 10, and one end of each hydrogen supply branch pipe 15 extending into the furnace body fast cooling section 10 is arranged close to one wind box 13. Above-mentioned structure, on the basis of existing equipment, reforms transform the rapid cooling section equipment of annealing stove, forms annealing decoloration furnace body 1, like this, goes up the oxidation look belted steel concentratedly, and pending belted steel 8 can reliably realize annealing decoloration processing when passing through from the quick cooling section 10 of furnace body of annealing decoloration furnace body 1, makes belted steel surface iron oxide reduce the decoloration under the high-temperature high hydrogen condition and become the certified products. The annealing and decoloring steps of the oxidation color strip steel annealing and decoloring method are as follows: the control part 16 controls the hydrogen stop valve 17 to be opened, controls the nitrogen-hydrogen mixed gas conveying pipeline 11 to be opened, starts the fan 12, starts the motor to drive the upper furnace roller 5 and the lower furnace roller 6 to rotate, and the strip steel 8 to be processed entering the furnace body inlet 7 continuously bypasses the lower furnace roller 6 and the upper furnace roller 5 in sequence and then extends to the furnace body outlet 9; the control part 16 controls a plurality of hydrogen supply branch pipes 15 of the secondary hydrogen supply pipe 14 to inject hydrogen into different parts inside the furnace body quick cooling section 10 of the annealing and decoloring furnace body 1, the hydrogen carries out reduction and decoloring on the strip steel 8 to be processed, and meanwhile, the nitrogen-hydrogen mixed gas conveying pipeline 11 injects nitrogen-hydrogen mixed gas into the furnace body quick cooling section 10 of the annealing and decoloring furnace body 1 to protect the strip steel 8 to be processed passing through the annealing and decoloring furnace body 1 from being oxidized and simultaneously carry out reduction on the strip steel to be processed; when the furnace atmosphere detector 19 detects that the hydrogen content in the furnace body fast cooling section 10 reaches 8% -10%, the control part 16 controls the opening of the hydrogen regulating valve 20 to be in a fixed state; when the furnace atmosphere detector 19 detects that the hydrogen content in the furnace body fast cooling section 10 of the annealing and decoloring furnace body 1 is less than 8%, the control part 16 controls the opening of the hydrogen regulating valve 20 to increase, and when the furnace atmosphere detector 19 detects that the hydrogen content in the furnace body fast cooling section 10 of the annealing and decoloring furnace body 1 is more than 10%, the control part 16 controls the opening of the hydrogen regulating valve 20 to decrease; the above steps are continued, so that the strip steel 8 to be treated can be subjected to decolorization and reduction treatment in batches. The oxidation color strip steel annealing and decoloring device and the oxidation color strip steel annealing and decoloring method have the advantages that the device structure is simple, the method steps are simple, the strip steel annealing and decoloring treatment of surface oxidation colors inevitably generated during the cold rolling continuous annealing production period can be conveniently and reliably carried out, the surface quality and the mechanical property of unqualified strip steel products are qualified, the waste of strips is avoided, and the cost reduction and the efficiency improvement are effectively realized.
The annealing and decoloring furnace body 1 is characterized in that a plurality of bellows 13 are arranged inside the furnace body quick cooling section 10 of the annealing and decoloring furnace body 1, each bellows 13 is connected with a fan 12 located outside the annealing and decoloring furnace body 1, the inner wall of one side of the furnace body quick cooling section 10, which is close to the annealing and decoloring furnace body 1, is provided with a plurality of bellows 13 according to gaps, and the inner wall of the other side of the furnace body quick cooling section 10, which is close to the annealing and decoloring furnace body 1, is provided with a plurality of bellows 13 according. When the strip steel 8 to be processed entering the furnace body inlet 7 sequentially bypasses the lower furnace roller 6 and the upper furnace roller 5 and then passes through the furnace body outlet 9, one side of the strip steel 8 to be processed passing through the furnace body fast cooling section 10 is set to be a structure capable of sequentially passing through a plurality of bellows 13, the other side of the strip steel 8 to be processed passing through the furnace body fast cooling section 10 is set to be a structure capable of sequentially passing through the bellows 13, and a plurality of heat exchangers 18 are arranged in the furnace body fast cooling section 10. According to the structure, the strip steel to be treated continuously passes through the annealing and decoloring furnace body 1, when the strip steel to be treated passes through the air box, the strip steel is cooled through cold air fed into the air box by the fan, and at the moment, hydrogen conveyed by the hydrogen supply branch pipes 15 of the secondary hydrogen supply pipe 14 acts on the surface of the strip steel to realize the annealing and decoloring on the surface of the strip steel to be treated, so that unqualified strip steel is converted into qualified strip steel, and waste is avoided.
The annealing and decoloring furnace body 1 is internally provided with a furnace atmosphere detector 19, the intracranial atmosphere detector 19 is connected with a control component 16, each fan 12 is respectively connected with the control component 16, a hydrogen stop valve 17 is arranged on the secondary hydrogen supply pipe 14, the hydrogen stop valve 17 is an electromagnetic hydrogen stop valve, and the hydrogen stop valve 17 is connected with the control component 16 capable of controlling the opening and closing of the hydrogen stop valve 17. The structure can monitor the hydrogen content in the annealing and decoloring furnace body 1 in real time through the arrangement of the furnace atmosphere detector 19, and avoid the excessive hydrogen content or insufficient hydrogen content. The strip steel to be treated can be annealed and decolored under the optimal environment, and the qualified waste products are realized.
When the control component 16 controls the hydrogen stop valve 17 to be opened, the hydrogen supply pipeline 4 is set to be a structure capable of supplying hydrogen to different parts in the furnace body fast cooling section 10 through the secondary hydrogen supply pipe 14 and the plurality of hydrogen supply branch pipes 15; the secondary hydrogen supply pipe 14 is further provided with a hydrogen regulating valve 20, and the hydrogen regulating valve 20 is connected to a control unit 16 capable of controlling the adjustment of the opening of the hydrogen regulating valve 20. In the above structure, the hydrogen regulating valve 20 and the furnace atmosphere detector 19 are respectively connected to the control unit, and cooperate with each other to monitor and regulate the hydrogen supply amount in real time.
The nitrogen-hydrogen mixed gas conveying pipeline 11 is provided with a nitrogen-hydrogen mixed gas conveying electromagnetic cut-off valve 21, and the nitrogen-hydrogen mixed gas conveying electromagnetic cut-off valve 21 is connected with the control component 16; the upper furnace roller 5 is connected with a driving motor, the upper furnace roller 5 and the lower furnace roller 6 are connected through a belt or a chain, and the driving motor is connected with a control component 16. With the above structure, the nitrogen-hydrogen mixed gas delivery solenoid cut valve 21 can effect supply and stop of the nitrogen-hydrogen mixed gas under the control of the control means. And after the nitrogen conveying pipeline and the hydrogen input pipeline respectively supply gas to enter the nitrogen-hydrogen mixing station, mixed gas with a ratio meeting the requirement can be prepared, and then the mixed gas is input into the annealing and decoloring furnace body 1. The mixed gas protects the strip steel in the furnace body from being oxidized and has reducing capability.
When the nitrogen-hydrogen mixed gas is injected into the furnace body fast cooling section 10 of the annealing and decoloring furnace body 1 through the nitrogen-hydrogen mixed gas conveying pipeline 11, the part ratio of hydrogen to nitrogen in the nitrogen-hydrogen mixed gas is controlled within the range of 1:18-1: 21. The in-furnace atmosphere detector 19 is set to be a structure capable of detecting oxygen content, hydrogen content and dew point value in the furnace body fast cooling section 10 of the annealing and decoloring furnace body 1 in real time, and when the in-furnace atmosphere detector 19 detects that the hydrogen content in the furnace body fast cooling section 10 reaches 8% -10%, the control part 16 is set to be a structure capable of controlling the opening of the hydrogen regulating valve 20 to be in a fixed state. Thus, the control and regulation of the supply amount and the content of hydrogen are effectively realized.
When the furnace atmosphere detector 19 detects that the hydrogen content in the furnace body fast cooling section 10 of the annealing and decoloring furnace body 1 is less than 8%, the control part 16 is set to be a structure capable of controlling the opening of the hydrogen regulating valve 20 to increase, and when the furnace atmosphere detector 19 detects that the hydrogen content in the furnace body fast cooling section 10 of the annealing and decoloring furnace body 1 is more than 10%, the control part 16 is set to be a structure capable of controlling the opening of the hydrogen regulating valve 20 to decrease. The structure enables the hydrogen content to be controlled in real time. Thereby ensuring that the hydrogen content is always in the content ratio meeting the requirement of annealing decoloration treatment.
The invention also relates to a method for annealing and decoloring the oxidation color strip steel, which has simple steps, can conveniently and reliably anneal and decolor the strip steel of the surface oxidation color inevitably generated during the production period of the cold rolling continuous annealing, ensures that the surface quality and the mechanical property of unqualified strip steel products are qualified, avoids the waste of strip steel and realizes the cost reduction and the efficiency improvement.
The annealing and decoloring steps of the oxidation color strip steel annealing and decoloring method are as follows: 1) the control part 16 controls the hydrogen stop valve 17 to be opened, controls the nitrogen-hydrogen mixed gas conveying pipeline 11 to be opened, starts the fan 12, starts the motor to drive the upper furnace roller 5 and the lower furnace roller 6 to rotate, and the strip steel 8 to be processed entering the furnace body inlet 7 continuously bypasses the lower furnace roller 6 and the upper furnace roller 5 in sequence and then extends to the furnace body outlet 9; 2) the control part 16 controls a plurality of hydrogen supply branch pipes 15 of the secondary hydrogen supply pipe 14 to inject hydrogen into different parts inside the furnace body quick cooling section 10 of the annealing and decoloring furnace body 1, the hydrogen carries out reduction and decoloring on the strip steel 8 to be processed, and meanwhile, the nitrogen-hydrogen mixed gas conveying pipeline 11 injects nitrogen-hydrogen mixed gas into the furnace body quick cooling section 10 of the annealing and decoloring furnace body 1 to protect the strip steel 8 to be processed passing through the annealing and decoloring furnace body 1 from being oxidized and simultaneously carry out reduction on the strip steel to be processed; 3) when the furnace atmosphere detector 19 detects that the hydrogen content in the furnace body fast cooling section 10 reaches 8% -10%, the control part 16 controls the opening of the hydrogen regulating valve 20 to be in a fixed state; 4) when the furnace atmosphere detector 19 detects that the hydrogen content in the furnace body fast cooling section 10 of the annealing and decoloring furnace body 1 is less than 8%, the control part 16 controls the opening of the hydrogen regulating valve 20 to increase, and when the furnace atmosphere detector 19 detects that the hydrogen content in the furnace body fast cooling section 10 of the annealing and decoloring furnace body 1 is more than 10%, the control part 16 controls the opening of the hydrogen regulating valve 20 to decrease; 5) the above steps are continued, so that the strip steel 8 to be treated can be subjected to decolorization and reduction treatment in batches.
In the oxidation color strip steel annealing and decolorizing device, a nitrogen-hydrogen mixing station comprises: conventionally, hydrogen is added into nitrogen and injected into each section of a furnace to protect strip steel from being oxidized in the furnace and have general reducing capability. Hydrogen shut-off valve, hydrogen flow meter, hydrogen regulating valve, and secondary hydrogen supply pipe 14 and hydrogen supply branch pipe: the metered and regulated high hydrogen is sent to the position of an air outlet duct of a fan through a hydrogen supply branch pipe, and the oxidation strip steel is reduced and decolored with higher hydrogen concentration than the conventional method. A furnace atmosphere detector: and dynamically detecting furnace atmosphere data in real time, wherein the furnace atmosphere data comprises oxygen content, hydrogen content and dew point (water content) values. Injecting high hydrogen into the fast cooling section, feeding back a signal to the control part by the furnace atmosphere detector when the high hydrogen in the fast cooling section furnace reaches 8% -10%, controlling the hydrogen regulating valve to maintain balance by the control part, giving an alarm by the system when the oxygen content in the fast cooling section furnace is 30ppm, and stopping injecting the high hydrogen into the fast cooling section when the oxygen content is 50 ppm. Furnace waste gas bleeding valve: the oxygen in the ferric oxide on the surface of the oxidized strip steel is replaced by hydrogen to produce water, and the formula is as follows:
when the water content reaches a certain amount and the dew point is above minus 20 ℃, the surface of the strip steel is oxidized by water. Therefore, when the dew point is detected to be above-25 ℃, the opening degree of the relief valve is controlled and increased by the signal.
The whole process of the oxidation color strip steel annealing and decoloring method comprises the following steps: 1. the strip steel enters a cleaning section on line, and the running speed of the cleaning section is reduced by 20 percent so as to increase the cleaning effect; 2. the strip steel enters an annealing and decoloring furnace body 1, and the running speed of the furnace is reduced by 20 percent so as to increase the contact time between the surface of the strip steel and hydrogen; 3. furnace atmosphere conditions: the oxygen content of each section is below 15 ppm; dew point below-35 deg.C; the furnace gas diffusion valves of the fast cooling section, the slow cooling section and the overaging section are opened by 20 percent; 4. after the strip steel enters the annealing and decoloring furnace body 1, high hydrogen is injected into the fast cooling section. When the high hydrogen in the furnace in the quick cooling section reaches 8-10% of hydrogen content, the signal sent by the control part controls the hydrogen regulating valve to maintain balanced injection. 5. Protection: when the content of the high hydrogen in the furnace in the rapid cooling section reaches 15 percent, stopping injecting the high hydrogen; the injection of high hydrogen was stopped at an oxygen content of 50 ppm.
The invention relates to an oxidative color strip steel annealing and decoloring device and an oxidative color strip steel annealing and decoloring method, which are characterized in that on the basis of the existing equipment, quick cooling section equipment of an annealing furnace is transformed to form an annealing and decoloring furnace body and realize the matching of related components, so that unqualified oxidative color strip steel is concentrated on line, and when strip steel to be treated passes through the quick cooling section of the furnace body of the annealing and decoloring furnace body, annealing and decoloring treatment can be reliably realized, so that iron oxide on the surface of the strip steel is reduced and decolored into iron under the high-temperature and high-hydrogen conditions and becomes qualified products. The annealing and decoloring steps of the oxidation color strip steel annealing and decoloring method are as follows: the control part controls the hydrogen stop valve to be opened, controls the nitrogen-hydrogen mixed gas conveying pipeline to be opened, starts the fan, starts the motor to drive the upper furnace roller and the lower furnace roller to rotate, and the strip steel to be treated entering the furnace body inlet continuously and sequentially bypasses the lower furnace roller and the upper furnace roller and then extends to the furnace body outlet; the control part controls a plurality of hydrogen supply branch pipes of the secondary hydrogen supply pipe to inject hydrogen into different parts inside a furnace body quick cooling section of the annealing and decoloring furnace body, the hydrogen carries out reduction decoloring on the strip steel to be processed, and meanwhile, a nitrogen-hydrogen mixed gas conveying pipeline injects nitrogen-hydrogen mixed gas into the furnace body quick cooling section of the annealing and decoloring furnace body to protect the strip steel to be processed passing through the annealing and decoloring furnace body from being oxidized and simultaneously carry out reduction on the strip steel to be processed; when the furnace atmosphere detector detects that the hydrogen content in the furnace body fast cooling section reaches 8% -10%, the control part controls the opening of the hydrogen regulating valve to be in a fixed state; when the furnace atmosphere detector detects that the hydrogen content in the furnace body fast cooling section of the annealing and decoloring furnace body is less than 8%, the control part controls the opening of the hydrogen regulating valve to be increased, and when the furnace atmosphere detector detects that the hydrogen content in the furnace body fast cooling section of the annealing and decoloring furnace body is more than 10%, the control part controls the opening of the hydrogen regulating valve to be decreased; and the steps are continued, so that the strip steel to be treated can be subjected to decoloration reduction treatment in batches. The oxidation color strip steel annealing and decoloring device and the oxidation color strip steel annealing and decoloring method have the advantages that the device structure is simple, the method steps are simple, the strip steel annealing and decoloring treatment of surface oxidation colors inevitably generated during the cold rolling continuous annealing production period can be conveniently and reliably carried out, the surface quality and the mechanical property of unqualified strip steel products are qualified, the waste of strips is avoided, and the cost reduction and the efficiency improvement are effectively realized.
The present invention has been described in connection with the accompanying drawings, and it is to be understood that the invention is not limited to the specific embodiments disclosed, but is intended to cover various modifications, changes and equivalents of the embodiments of the invention, and its application to other applications without departing from the spirit and scope of the invention.
Claims (6)
1. The utility model provides an oxidation look belted steel annealing decoloration device which characterized in that: the oxidation color strip steel annealing and decoloring device comprises an annealing and decoloring furnace body (1) and a nitrogen-hydrogen mixing station (2), wherein a nitrogen supply pipeline (3) and a hydrogen supply pipeline (4) are respectively communicated with the nitrogen-hydrogen mixing station (2), an upper furnace roller (5) and a lower furnace roller (6) are arranged in the annealing and decoloring furnace body (1), strip steel (8) to be processed entering a furnace body inlet (7) is arranged into a structure capable of sequentially bypassing the lower furnace roller (6) and the upper furnace roller (5) and then extending to the outside of a furnace body outlet (9), the annealing and decoloring furnace body (1) comprises a furnace body quick cooling section (10), a nitrogen-hydrogen mixed gas conveying pipeline (11) of the nitrogen-hydrogen mixing station (2) extends to the furnace body quick cooling section (10) in the annealing and decoloring furnace body (1), a plurality of air boxes (12) are arranged outside the annealing and decoloring furnace body (1), and a plurality of air boxes (13) are arranged inside the furnace body quick, a secondary hydrogen supply pipe (14) is arranged on the hydrogen supply pipeline (4), a plurality of hydrogen supply branch pipes (15) are arranged on the secondary hydrogen supply pipe (14), each hydrogen supply branch pipe (15) extends into the furnace body fast cooling section (10) respectively, and one end of each hydrogen supply branch pipe (15) extending into the furnace body fast cooling section (10) is arranged close to one air box (13) respectively;
a furnace atmosphere detector (19) is arranged in the annealing and decoloring furnace body (1), the furnace atmosphere detector (19) is connected with a control component (16), each fan (12) is respectively connected with the control component (16), a hydrogen stop valve (17) is arranged on a secondary hydrogen supply pipe (14), the hydrogen stop valve (17) is an electromagnetic hydrogen stop valve, and the hydrogen stop valve (17) is connected with the control component (16) capable of controlling the opening and closing of the hydrogen stop valve (17);
when the control component (16) controls the hydrogen stop valve (17) to be opened, the hydrogen supply pipeline (4) is set to be a structure capable of supplying hydrogen to different parts in the furnace body fast cooling section (10) through the secondary hydrogen supply pipe (14) and the plurality of hydrogen supply branch pipes (15); the secondary hydrogen supply pipe (14) is also provided with a hydrogen regulating valve (20), and the hydrogen regulating valve (20) is connected with a control component (16) capable of controlling the opening degree of the hydrogen regulating valve (20) to be regulated;
the in-furnace atmosphere detector (19) is set to be in a structure capable of detecting oxygen content, hydrogen content and dew point numerical values in the furnace body fast cooling section (10) of the annealing and decoloring furnace body (1) in real time, and when the in-furnace atmosphere detector (19) detects that the hydrogen content in the furnace body fast cooling section (10) reaches 8% -10%, the control part (16) is set to be in a structure capable of controlling the opening degree of the hydrogen regulating valve (20) to be in a fixed state;
when the furnace atmosphere detector (19) detects that the hydrogen content in the furnace body fast cooling section (10) of the annealing and decoloring furnace body (1) is less than 8%, the control part (16) is set to be in a structure capable of controlling the opening of the hydrogen regulating valve (20) to be increased, and when the furnace atmosphere detector (19) detects that the hydrogen content in the furnace body fast cooling section (10) of the annealing and decoloring furnace body (1) is more than 10%, the control part (16) is set to be in a structure capable of controlling the opening of the hydrogen regulating valve (20) to be decreased.
2. The oxidation color strip steel annealing and decoloring device according to claim 1, wherein: the annealing and decoloring furnace body is characterized in that a plurality of bellows (13) are arranged inside a furnace body quick cooling section (10) of the annealing and decoloring furnace body (1), each bellows (13) is connected with a fan (12) which is positioned outside the annealing and decoloring furnace body (1), the inner wall of one side of the annealing and decoloring furnace body (1) is close to the inner wall of one side of the annealing and decoloring furnace body (10) and is provided with a plurality of bellows (13) according to a gap, and the inner wall of the other side of the annealing and decoloring furnace body (1) is close to the inner wall of the other side of the annealing and decoloring furnace body (.
3. The oxidation color strip steel annealing and decoloring device according to claim 1 or 2, wherein: when the strip steel (8) to be treated entering the furnace body inlet (7) sequentially bypasses the lower furnace roller (6) and the upper furnace roller (5) and then passes through the furnace body outlet (9), one side of the strip steel (8) to be treated passing through the furnace body fast cooling section (10) is set to be a structure capable of sequentially passing through a plurality of air boxes (13), the other side of the strip steel (8) to be treated passing through the furnace body fast cooling section (10) is set to be a structure capable of sequentially passing through the plurality of air boxes (13), and a plurality of heat exchangers (18) are arranged in the furnace body fast cooling section (10).
4. The oxidation color strip steel annealing and decoloring device according to claim 1 or 2, wherein: the nitrogen-hydrogen mixed gas conveying pipeline (11) is provided with a nitrogen-hydrogen mixed gas conveying electromagnetic cut-off valve (21), and the nitrogen-hydrogen mixed gas conveying electromagnetic cut-off valve (21) is connected with a control component (16); the upper furnace roller (5) is connected with a driving motor, the upper furnace roller (5) is connected with the lower furnace roller (6) through a belt or a chain, and the driving motor is connected with a control component (16).
5. The oxidation color strip steel annealing and decoloring device according to claim 1 or 2, wherein: when the nitrogen-hydrogen mixed gas conveying pipeline (11) injects the nitrogen-hydrogen mixed gas into the furnace body fast cooling section (10) of the annealing and decoloring furnace body (1), the part ratio of hydrogen and nitrogen in the nitrogen-hydrogen mixed gas is controlled within the range of 1:18-1: 21.
6. An annealing and decoloring method of oxidation color strip steel is characterized by comprising the following steps: the method utilizes the oxidation color strip steel annealing and decoloring device of claim 1, and the annealing and decoloring steps of the oxidation color strip steel annealing and decoloring method are as follows: 1) the control part (16) controls a hydrogen stop valve (17) to be opened, controls a nitrogen-hydrogen mixed gas conveying pipeline (11) to be opened, starts a fan (12), starts a motor to drive an upper furnace roller (5) and a lower furnace roller (6) to rotate, and continuously and sequentially bypasses the lower furnace roller (6) and the upper furnace roller (5) and extends to a furnace body outlet (9) after strip steel (8) to be treated enters a furnace body inlet (7); 2) the control component (16) controls a plurality of hydrogen supply branch pipes (15) of the secondary hydrogen supply pipe (14) to inject hydrogen into different parts inside the furnace body quick cooling section (10) of the annealing and decoloring furnace body (1), the hydrogen carries out reduction and decoloring on the strip steel (8) to be processed, and meanwhile, the nitrogen-hydrogen mixed gas conveying pipeline (11) injects nitrogen-hydrogen mixed gas into the furnace body quick cooling section (10) of the annealing and decoloring furnace body (1) to protect the strip steel (8) to be processed passing through the annealing and decoloring furnace body (1) from being oxidized and simultaneously carry out reduction on the strip steel (8) to be processed; 3) when the furnace atmosphere detector (19) detects that the hydrogen content in the furnace body fast cooling section (10) reaches 8% -10%, the control part (16) controls the opening of the hydrogen regulating valve (20) to be in a fixed state; 4) when the in-furnace atmosphere detector (19) detects that the hydrogen content in the fast cooling section (10) of the annealing and decoloring furnace body (1) is less than 8%, the control component (16) controls the opening of the hydrogen regulating valve (20) to increase, and when the in-furnace atmosphere detector (19) detects that the hydrogen content in the fast cooling section (10) of the annealing and decoloring furnace body (1) is more than 10%, the control component (16) controls the opening of the hydrogen regulating valve (20) to decrease; 5) the steps are continued, so that the strip steel (8) to be treated can be subjected to decoloration reduction treatment in batches.
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| CN2178722Y (en) * | 1994-01-27 | 1994-10-05 | 唐山市冷轧镀锌带钢厂 | strip steel continuous bright annealing furnace |
| JP2004018967A (en) * | 2002-06-18 | 2004-01-22 | Chugai Ro Co Ltd | Heat treatment furnace |
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