CN115505695B - Non-oriented silicon steel annealing furnace with extremely thin specification - Google Patents
Non-oriented silicon steel annealing furnace with extremely thin specification Download PDFInfo
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- CN115505695B CN115505695B CN202211181017.2A CN202211181017A CN115505695B CN 115505695 B CN115505695 B CN 115505695B CN 202211181017 A CN202211181017 A CN 202211181017A CN 115505695 B CN115505695 B CN 115505695B
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- 238000000137 annealing Methods 0.000 title claims abstract description 32
- 229910000976 Electrical steel Inorganic materials 0.000 title claims abstract description 30
- 238000001816 cooling Methods 0.000 claims abstract description 87
- 238000010438 heat treatment Methods 0.000 claims abstract description 72
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 70
- 239000010959 steel Substances 0.000 claims abstract description 70
- 239000007789 gas Substances 0.000 claims abstract description 47
- 238000007664 blowing Methods 0.000 claims abstract description 14
- 230000005674 electromagnetic induction Effects 0.000 claims abstract description 12
- 230000001681 protective effect Effects 0.000 claims abstract description 12
- 238000002791 soaking Methods 0.000 claims abstract description 10
- 238000007789 sealing Methods 0.000 claims description 33
- 238000005485 electric heating Methods 0.000 claims description 26
- 239000001257 hydrogen Substances 0.000 claims description 20
- 229910052739 hydrogen Inorganic materials 0.000 claims description 20
- 230000001105 regulatory effect Effects 0.000 claims description 17
- 239000011819 refractory material Substances 0.000 claims description 15
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 10
- 238000009826 distribution Methods 0.000 claims description 10
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 6
- 229910052757 nitrogen Inorganic materials 0.000 claims description 5
- 230000001502 supplementing effect Effects 0.000 claims description 5
- 238000003466 welding Methods 0.000 claims description 4
- 238000002156 mixing Methods 0.000 claims description 2
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 abstract description 9
- 230000009286 beneficial effect Effects 0.000 abstract description 5
- 230000000694 effects Effects 0.000 abstract description 5
- 230000015572 biosynthetic process Effects 0.000 abstract 1
- 239000011257 shell material Substances 0.000 description 37
- 238000002347 injection Methods 0.000 description 14
- 239000007924 injection Substances 0.000 description 14
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 10
- 230000006698 induction Effects 0.000 description 5
- 229910052742 iron Inorganic materials 0.000 description 5
- 239000007921 spray Substances 0.000 description 5
- 230000001276 controlling effect Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000005855 radiation Effects 0.000 description 2
- 230000006641 stabilisation Effects 0.000 description 2
- 238000011105 stabilization Methods 0.000 description 2
- 230000033228 biological regulation Effects 0.000 description 1
- 239000011162 core material Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
Classifications
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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
-
- 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
-
- 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
- C21D1/42—Induction heating
-
- 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
-
- 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
- C21D11/005—Process control or regulation for heat treatments for cooling
-
- 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
-
- 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
-
- 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
- C21D9/5735—Details
-
- 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
- C21D9/60—Continuous furnaces for strip or wire with induction heating
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Heat Treatment Of Strip Materials And Filament Materials (AREA)
Abstract
The invention discloses an ultra-thin non-oriented silicon steel annealing furnace, which comprises a No. 1 radiant tube heating section, an electromagnetic induction furnace, a No. 2 radiant tube heating section, an electric soaking section, a uniform cooling control section and a protective gas circulation blowing cooling section which are sequentially arranged along the conveying direction of strip steel, wherein the strip steel sequentially passes through each furnace section. The invention improves the heating efficiency of the heating section, ensures more uniform heating and better heating effect, is beneficial to the formation of uniform crystalline phase texture of the strip steel, and is beneficial to the reduction of emission of nitrogen oxides; realizing a cooling rate of 10 ℃/s or even lower at a plate temperature of 1000 ℃; the cooling effect is good.
Description
Technical Field
The invention relates to the technical field of metallurgy, in particular to an ultra-thin non-oriented silicon steel annealing furnace.
Background
With the implementation of national new energy strategy and energy efficiency upgrading policy, new energy automobile industry is vigorously developed, non-oriented silicon steel is one of core materials of automobile driving motors, and is required to have the technical characteristics of high magnetic induction, high frequency, low iron loss and high strength, while the traditional high-grade non-oriented silicon steel cannot meet the technical characteristics. For example, the iron loss of the traditional 0.5mm thick high-grade non-oriented silicon steel is less than 3.5W/kg under the conditions of magnetic flux density of 1.5T and frequency of 50Hz, and when the frequency is increased to 400Hz, the iron loss exceeds 80W/kg, so that the requirement of high-frequency low iron loss cannot be met. The thickness of the current non-oriented silicon steel is generally between 0.35mm and 0.5mm, and the thickness of the non-oriented silicon steel for the motor of the new energy automobile is generally between 0.2 and 0.3mm. Therefore, the thinned strip steel is a development trend of non-oriented silicon steel for new energy automobile motors, and meanwhile, the product performance is realized by annealing methods such as rapid heating, uniform controlled cooling and the like.
Based on the above needs, there is an urgent need for a silicon steel annealing furnace that can meet the annealing production requirements of non-oriented silicon steel of extremely thin gauge.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides the non-oriented silicon steel annealing furnace with extremely thin specification, which improves the heating efficiency of a heating section, ensures that the heating is more uniform and the heating effect is better, is beneficial to forming uniform crystalline phase texture of strip steel and simultaneously is beneficial to reducing the emission of nitrogen oxides; realizing a cooling rate of 10 ℃/s or even lower at a plate temperature of 1000 ℃; the cooling effect is good.
The technical scheme adopted by the invention for solving the technical problems is as follows:
an ultra-thin non-oriented silicon steel annealing furnace comprises a No. 1 radiant tube heating section, an electromagnetic induction furnace, a No. 2 radiant tube heating section, an electric soaking section, a uniform cooling control section and a protective gas circulation blowing cooling section which are sequentially arranged along the conveying direction of strip steel, wherein the strip steel sequentially passes through the furnace sections.
According to the technical scheme, the electromagnetic induction furnace is respectively connected with the 1# radiant tube heating furnace and the 2# radiant tube heating furnace in a sealing manner through flanges, and other furnace sections are connected through flange welding.
According to the technical scheme, the 1# radiant tube heating section and the 2# radiant tube heating section are the same in structure and comprise radiant tube heating section furnace shells and a plurality of radiant tubes, strip steel longitudinally passes through the radiant tube heating section furnace shells, the plurality of radiant tubes are divided into two groups and are arranged in the radiant tube heating section furnace shells, one group of radiant tubes are sequentially and alternately arranged above the conveying strip steel in the furnace along the strip steel conveying direction, the other group of radiant tubes are sequentially and alternately arranged below the conveying strip steel in the furnace along the strip steel conveying direction, one end of each radiant tube penetrates out of the radiant tube heating section furnace shells to be connected with a burner, and refractory materials are arranged on the inner wall of the radiant tube heating section furnace shells.
According to the technical scheme, the electric heating section comprises an electric heating section furnace shell, a resistance belt and an electric radiant tube, wherein the inner wall of the electric heating section furnace shell is provided with refractory materials, the electric radiant tube is sequentially arranged above the conveying strip steel in the furnace at intervals along the strip steel conveying direction in the electric heating section furnace shell, and the resistance belt is arranged below the conveying strip steel in the furnace along the strip steel conveying direction in the electric heating section furnace shell and is arranged at the bottom of the electric heating section furnace shell.
According to the technical scheme, the uniform cooling control section comprises a uniform cooling control section furnace shell and a plurality of cooling pipes, the cooling pipes are divided into two groups and are arranged in the uniform cooling control section furnace shell, one group of cooling pipes are sequentially and alternately arranged above the conveying strip steel in the furnace along the strip steel conveying direction, the other group of cooling pipes are sequentially and alternately arranged below the conveying strip steel in the furnace along the strip steel conveying direction, a heat supplementing device is further arranged in the uniform cooling control section furnace shell, and refractory materials are arranged on the inner wall of the uniform cooling control section furnace shell.
According to the technical scheme, the heat supplementing device is a second resistance belt arranged at the bottom of the furnace or a second electric radiant tube arranged on the side wall.
According to the technical scheme, the protection gas circulation blowing cooling section comprises a blowing cooling section furnace shell, a heat exchanger, a circulating fan, a circulating air duct and two spray boxes, wherein the two spray boxes are respectively arranged above and below conveying strip steel in the furnace, an inner cavity of the blowing cooling section furnace shell is communicated with an inlet end of the circulating fan through a pipeline through the heat exchanger, one end of the circulating air duct is communicated with an outlet end of the circulating fan, and the other end of the circulating air duct penetrates into the blowing cooling section furnace shell and is respectively communicated with the two spray boxes.
According to the technical scheme, the circulating air duct is provided with a plurality of baffles for independently adjusting the air quantity.
According to the technical scheme, the isolators are arranged between the electric soaking section and the uniform cooling control section and between the uniform cooling control section and the protection gas circulation blowing cooling section;
the inlet and the outlet of the annealing furnace are respectively provided with an inlet sealing chamber and an outlet sealing chamber.
According to the technical scheme, the protective gas inlet holes on each section of furnace body of the annealing furnace are connected with a mixed gas distribution system;
the mixed gas distribution system comprises a nitrogen-hydrogen mixer, a regulating valve group and a flow regulating valve group, wherein a nitrogen source and a hydrogen source are connected with the nitrogen-hydrogen mixer through pipelines through the regulating valve group and the flow regulating valve group, and the nitrogen-hydrogen mixer is connected with the protective gas inlet holes on each section of furnace body.
The invention has the following beneficial effects:
1. according to the invention, through the combination mode of the heating section of the 1# radiant tube, the electromagnetic induction furnace and the heating section of the 2# radiant tube, the heating rate is higher than that of the conventional radiant tube, and the heating efficiency is improved; through the electric heating section, a more uniform heating effect than that of the conventional radiant tube heating is realized in a high plate temperature range (such as 900-1000 ℃) of the strip steel, so that the strip steel is facilitated to form uniform crystalline phase texture, and meanwhile, the emission of nitrogen oxides is reduced; through the uniform cooling control section, the cooling rate of 10 ℃/s or even lower at the plate temperature of 1000 ℃ can be realized; the strip steel plate type regulation control and final cooling are carried out through the protection gas circulation blowing cooling section, so that the process requirements of the ultrathin strip steel are met.
2. Through the shielding gas control system, different atmospheres can be controlled to be used in different furnace sections, and the stabilization of the components of the atmosphere in the furnace and the stabilization of the furnace pressure are realized.
Drawings
FIG. 1 is a schematic structural view of an extremely thin gauge non-oriented silicon steel annealing furnace in an embodiment of the invention;
FIG. 2 is a cross-sectional view A-A of FIG. 1;
FIG. 3 is a sectional view B-B of FIG. 1;
FIG. 4 is a cross-sectional view of C-C of FIG. 1;
FIG. 5 is a D-D sectional view of FIG. 1;
FIG. 6 is a front view of a cooling section of a shielding gas circulation injection in an embodiment of the present invention;
FIG. 7 is a left side view of FIG. 6;
FIG. 8 is a schematic diagram of a hybrid gas distribution system in accordance with an embodiment of the present invention;
in the figure, a 1-inlet sealing chamber, a 2-1# radiant tube heating section, a 3-induction furnace, a 4-2# radiant tube heating section, a 5-electric heating section, a 6-soaking section, a 7-isolator, an 8-uniform cooling control section, a 9-protective gas circulation injection cooling section, a 10-outlet sealing chamber and an 11-protective gas inlet hole;
1.1-a furnace shell of a heating section of a radiant tube, 1.2-a first refractory material, 1.3-a radiant tube and 1.4-a burner;
5.1-electric heating section furnace shell, 5.2-second refractory material, 5.3-resistance band and 5.4-first electric radiant tube;
8.1-uniform cooling control section furnace shell, 8.2-third refractory material, 8.3-cooling pipe, 8.4-second resistance band or second electric radiant tube;
9.1-of a furnace shell of an injection cooling section, 9.2-of a heat exchanger, 9.3-of a circulating fan, 9.4-of a circulating air duct, 9.4.1-of a baffle plate and 9.5-of an injection box;
12.1-nitrogen-hydrogen mixer, 12.2-regulating valve group and 12.3-flow regulating valve group.
Detailed Description
The invention will now be described in detail with reference to the drawings and examples.
Referring to fig. 1 to 8, the ultra-thin non-oriented silicon steel annealing furnace in one embodiment provided by the invention comprises a No. 1 radiant tube heating section 2, an electromagnetic induction furnace 3, a No. 2 radiant tube heating section 4, an electric heating section 5, an electric soaking section 6, a uniform cooling control section 8 and a protective gas circulation blowing cooling section 9 which are sequentially arranged along the conveying direction of strip steel, wherein the strip steel sequentially passes through the furnace sections.
Further, the combination of the heating section of the 1# radiant tube, the electromagnetic induction furnace and the heating section of the 2# radiant tube is used as rapid heating, and the average heating rate can reach 30-35 ℃/s which is far higher than that of the conventional radiant tube heating section; the heating sections of the No. 1 radiant tube and the No. 2 radiant tube heat the strip steel in a radiation way through a gas radiant tube, the radiant tubes are respectively arranged at the upper part and the lower part of the strip steel, and the radiant tubes can be one or a combination of a plurality of I type, U type and W type; the electromagnetic induction furnace is arranged between the heating sections of the No. 1 radiant tube and the No. 2 radiant tube, and the strip steel is rapidly heated by the electromagnetic induction principle, so that the average heating rate is improved. The electromagnetic induction furnace is connected and sealed with the radiant tube heating section through a flange.
Further, the electromagnetic induction furnace is respectively connected with the 1# radiant tube heating furnace and the 2# radiant tube heating furnace in a sealing way through flanges, and other furnace sections are connected through flange welding.
Further, the 1# radiant tube heating section 2 and the 2# radiant tube heating section 4 are the same in structure and comprise a radiant tube heating section furnace shell 1.1 and a plurality of radiant tubes 1.3, strip steel longitudinally penetrates through the radiant tube heating section furnace shell 1.1, the plurality of radiant tubes 1.3 are divided into two groups to be arranged in the radiant tube heating section furnace shell 1.1, one group of radiant tubes 1.3 are sequentially arranged above the conveying strip steel in the furnace at intervals along the conveying direction of the strip steel, the other group of radiant tubes 1.3 are sequentially arranged below the conveying strip steel in the furnace at intervals along the conveying direction of the strip steel, one end of each radiant tube 1.3 penetrates out of the radiant tube heating section furnace shell 1.1 to be connected with a burner nozzle 1.4, and the inner wall of the radiant tube heating section furnace shell 1.1 is provided with a first refractory material 1.2.
Further, the radiant tube 1.3 may be one or a combination of several of I-type, U-type and W-type.
Further, the electric heating section comprises an electric heating section furnace shell 5.1, a resistance belt 5.3 and electric radiant tubes 5.4, the second refractory material 5.2 is arranged on the inner wall of the electric heating section furnace shell 5.1, the electric radiant tubes 5.4 are sequentially arranged above the conveying strip steel in the furnace at intervals along the strip steel conveying direction in the electric heating section furnace shell 5.1, and the resistance belt 5.3 is arranged below the conveying strip steel in the furnace along the strip steel conveying direction in the electric heating section furnace shell 5.1 and is arranged at the bottom of the electric heating section furnace shell 5.1.
Further, the uniform cooling control section comprises a uniform cooling control section furnace shell 8.1 and a plurality of cooling pipes 8.3, the cooling pipes 8.3 are divided into two groups and are arranged in the uniform cooling control section furnace shell 8.1, one group of cooling pipes 8.3 are sequentially and alternately arranged above the conveying strip steel in the furnace along the strip steel conveying direction, the other group of cooling pipes 8.3 are sequentially and alternately arranged below the conveying strip steel in the furnace along the strip steel conveying direction, a heat supplementing device is further arranged in the uniform cooling control section furnace shell 8.1, and a third refractory material 8.2 is arranged on the inner wall of the uniform cooling control section furnace shell 8.1.
Furthermore, the uniform cooling control section achieves the purpose of precisely controlling the cooling rate of the strip steel through the combined design of heating and cooling equipment.
Further, the heat supplementing device is a second resistance belt arranged on the furnace bottom or a second electric radiant tube arranged on the side wall.
Further, the cooling tube 8.3 is of type I or U.
Further, the shielding gas circulation injection cooling section 9 comprises an injection cooling section furnace shell 9.1, a heat exchanger 9.2, a circulation fan 9.3, a circulation air duct 9.4 and two injection boxes 9.5, wherein the two injection boxes 9.5 are respectively arranged above and below conveying strip steel in the furnace, an inner cavity of the injection cooling section furnace shell 9.1 is communicated with an inlet end of the circulation fan 9.3 through the heat exchanger by a pipeline, one end of the circulation air duct 9.4 is communicated with an outlet end of the circulation fan 9.3, and the other end of the circulation air duct 9.4 penetrates into the injection cooling section furnace shell 9.1 and is respectively communicated with the two injection boxes 9.5.
Further, the circulating air duct 9.4 is provided with a plurality of baffles 9.4.1 for independently adjusting the air quantity; the number of baffles 9.4.1 is 5.
Further, the protection gas in the furnace is cooled by the heat exchanger 9.2, and is sprayed to the surface of the strip steel by the spray boxes 9.5 arranged on the upper part and the lower part of the strip steel by the circulating fan 9.3 through the circulating air duct 9.4, so as to cool the strip steel. The circulation duct 9.4 is provided with five baffles 9.4.1 which can independently adjust the air quantity and can be operated manually or automatically.
Further, an isolator 7 is arranged between the electric soaking section 6 and the uniform cooling control section 8 and between the uniform cooling control section 8 and the protection gas circulation injection cooling section 9; the isolator equipment is arranged between the furnace sections according to the process requirement, the isolator is arranged at the position where atmosphere isolation is required, and can be arranged at the positions of an electric soaking section, an outlet of a uniform cooling control section and the like, and the atmosphere of the furnace sections before and after the isolator is isolated through a sealing baffle plate and a diffusing channel of the isolator, so that the atmospheres before and after the isolator can not be mutually connected;
an inlet sealing chamber and an outlet sealing chamber are respectively arranged at the inlet and the outlet of the annealing furnace; the inlet sealing chamber and the outlet sealing chamber have the same structure and are respectively arranged at the inlet and the outlet of the annealing furnace, namely, the inlet sealing chamber and the outlet sealing chamber are arranged at the inlet of the heating section 2 of the No. 1 radiant tube and the outlet of the circulating injection cooling section 9 of the shielding gas; the sealing roller, the sealing door and the sealing baffle are used for controlling the air outside the furnace not to enter the furnace.
The inlet sealing chamber, the outlet sealing chamber and the isolators 7 form a shielding gas control system
Further, the shielding gas control system also comprises a mixed gas distribution system, and the mixed gas distribution system is connected with shielding gas inlet holes on each section of furnace body of the annealing furnace;
the mixed gas distribution system comprises a nitrogen-hydrogen mixer 12.1, a regulating valve group 12.2 and a flow regulating valve group 12.3, wherein a nitrogen source and a hydrogen source are connected with the nitrogen-hydrogen mixer 12.1 through pipelines through the regulating valve group 12.2 and the flow regulating valve group 12.3, and the nitrogen-hydrogen mixer 12.1 is connected with a protective gas inlet hole on each section of furnace body through a pipeline.
The working principle of the invention is as follows: as shown in FIG. 1, the ultra-thin non-oriented silicon steel annealing furnace of the embodiment of the invention comprises an inlet sealing chamber 1, a No. 1 radiant tube heating section 2, an induction furnace 3, a No. 2 radiant tube heating section 4, an electric heating section 5, a soaking section 6, an isolator 7, a uniform cooling control section 8, a protective gas circulation injection cooling section 9, an outlet sealing chamber 10 and a protective gas inlet hole 11
Wherein, the heating section 2 of the No. 1 radiant tube is connected with the induction furnace 3, the induction furnace 3 is connected with the heating section 4 of the No. 2 radiant tube through a flange and a seal 3.1, and other furnace sections are connected through flange welding.
The radiant tube heating section consists of a radiant tube heating section furnace shell 1.1, a first refractory material 1.2, a radiant tube 1.3, a burner 1.4 and the like. The radiant tubes 1.3 are arranged in the upper and lower part of the strip. The radiant tube 1.3 can be one or a combination of several of I type, U type and W type.
The electric heating section consists of an electric heating section furnace shell 5.1, a second refractory material 5.2, a resistance belt 5.3, an electric radiant tube 5.4 and the like. The resistance band 5.3 is arranged at the lower part of the strip steel, and the electric radiant tube 5.4 is arranged at the upper part of the strip steel.
The uniform cooling control section consists of a furnace shell 8.1 of the uniform cooling control section, a third refractory material 8.2, a cooling pipe 8.3, a second resistance band or a second electric radiation pipe 8.4 and the like. The cooling pipes 8.3 are arranged at the upper part and the lower part of the strip steel, and can be I-shaped or U-shaped. The heat compensating device can adopt a second resistance belt arranged on the furnace bottom or a second electric radiant tube arranged on the side wall.
The protective gas circulation blowing cooling section consists of a blowing cooling section furnace shell 9.1, a heat exchanger 9.2, a circulating fan 9.3, a circulating air duct 9.4, a blowing box 9.5 and the like. The protection gas in the furnace is cooled by a heat exchanger 9.2, is blown to the surface of the strip steel by a circulating fan 9.3 through a circulating air duct 9.4 through a spray box 9.5 arranged on the upper part and the lower part of the strip steel, and is used for cooling the strip steel. The circulation duct 9.4 is provided with five baffles 9.4.1 which can independently adjust the air quantity and can be operated manually or automatically.
The shielding gas control system provided by the embodiment of the invention is based on the extremely thin non-oriented silicon steel annealing furnace of the embodiment, and is described as follows:
the shielding gas control system consists of an inlet sealing chamber 1, an outlet sealing chamber 10, an isolator 7, a mixed gas distribution system and a shielding gas inlet hole 11.
The inlet sealing chamber 1 and the outlet sealing chamber 10 have the same structure and are respectively arranged at the inlet and the outlet of the annealing furnace. The sealing roller, the sealing door and the sealing baffle are used for controlling the air outside the furnace not to enter the furnace.
The isolator 7 isolates the atmosphere of the front and rear furnace sections through the sealing baffle 7.1 and the diffusing channel 7.2, so that the atmospheres in front and rear of the isolator cannot be mutually connected.
The mixing and distributing system consists of a nitrogen-hydrogen mixer 12.1, a nitrogen and hydrogen regulating valve group 12.2 in front of the nitrogen-hydrogen mixer and a flow regulating valve group 12.3 behind the mixer, nitrogen and hydrogen are mixed in the mixer 12.1 according to different proportions through the nitrogen-hydrogen and hydrogen regulating valve group 12.2, then the gas flow of different furnace sections is controlled through the flow regulating valve group 12.3 behind the mixer, and the nitrogen-hydrogen mixture is introduced into an annealing furnace for use through a protective gas introducing hole 11 arranged on each section of furnace body.
In conclusion, the non-oriented silicon steel annealing furnace with the extremely thin specification solves the problems of low heating rate, low heating uniformity, poor control accuracy of the cooling rate, easiness in generating side waves and the like existing in the existing silicon steel annealing furnace when the non-oriented silicon steel for the new energy automobile is produced. The production requirement of the non-oriented silicon steel for the new energy automobile motor can be met, and the annealing furnace provided by the invention can be used for obtaining the ultra-thin high-grade non-oriented silicon steel product with the technical characteristics of high magnetic induction, high frequency, low iron loss and high strength. The innovation value is outstanding.
The foregoing is merely illustrative of the present invention and is not intended to limit the scope of the invention, which is defined by the claims and their equivalents.
Claims (7)
1. The non-oriented silicon steel annealing furnace is characterized by comprising a No. 1 radiant tube heating section (2), an electromagnetic induction furnace (3), a No. 2 radiant tube heating section (4), an electric heating section (5), an electric soaking section (6), a uniform cooling control section (8) and a protective gas circulation blowing cooling section (9) which are sequentially arranged along the conveying direction of strip steel, wherein the strip steel sequentially passes through the furnace sections;
the electric heating section comprises an electric heating section furnace shell (5.1), a resistance belt (5.3) and electric radiant tubes (5.4), wherein a second refractory material (5.2) is arranged on the inner wall of the electric heating section furnace shell (5.1), the electric radiant tubes (5.4) are sequentially arranged above the conveying strip steel in the furnace at intervals along the strip steel conveying direction in the electric heating section furnace shell (5.1), and the resistance belt (5.3) is arranged below the conveying strip steel in the furnace along the strip steel conveying direction in the electric heating section furnace shell (5.1) and is arranged at the bottom of the electric heating section furnace shell (5.1);
the uniform cooling control section comprises a uniform cooling control section furnace shell (8.1) and a plurality of cooling pipes (8.3), the cooling pipes (8.3) are divided into two groups and are arranged in the uniform cooling control section furnace shell (8.1), one group of cooling pipes (8.3) are sequentially and alternately arranged above conveying strip steel in the furnace along the strip steel conveying direction, the other group of cooling pipes (8.3) are sequentially and alternately arranged below conveying strip steel in the furnace along the strip steel conveying direction, a heat supplementing device is further arranged in the uniform cooling control section furnace shell (8.1), and a third refractory material (8.2) is arranged on the inner wall of the uniform cooling control section furnace shell (8.1);
the protection gas circulation jetting cooling section (9) comprises a jetting cooling section furnace shell (9.1), a heat exchanger (9.2), a circulating fan (9.3), a circulating air channel (9.4) and two jetting boxes (9.5), wherein the two jetting boxes (9.5) are respectively arranged above and below conveying strip steel in the furnace, an inner cavity of the jetting cooling section furnace shell (9.1) is communicated with an inlet end of the circulating fan (9.3) through a pipeline through the heat exchanger, one end of the circulating air channel (9.4) is communicated with an outlet end of the circulating fan (9.3), and the other end of the circulating air channel (9.4) penetrates into the jetting cooling section furnace shell (9.1) to be respectively communicated with the two jetting boxes (9.5).
2. The non-oriented silicon steel annealing furnace with extremely thin specification according to claim 1, wherein the electromagnetic induction furnace is respectively connected with a No. 1 radiant tube heating furnace and a No. 2 radiant tube heating furnace in a sealing manner through flanges, and other furnace sections are connected through flange welding.
3. The ultra-thin non-oriented silicon steel annealing furnace according to claim 1, wherein the 1# radiant tube heating section (2) and the 2# radiant tube heating section (4) are the same in structure and comprise radiant tube heating section shells (1.1) and a plurality of radiant tubes (1.3), strip steel longitudinally passes through the radiant tube heating section shells (1.1), the plurality of radiant tubes (1.3) are divided into two groups and are arranged in the radiant tube heating section shells (1.1), one group of radiant tubes (1.3) are sequentially arranged above the conveying strip steel in the furnace at intervals along the conveying direction of the strip steel, the other group of radiant tubes (1.3) are sequentially arranged below the conveying strip steel in the furnace at intervals along the conveying direction of the strip steel, one end of each radiant tube (1.3) penetrates out of each radiant tube heating section shell (1.1) and is connected with a burner (1.4), and a first refractory material (1.2) is arranged on the inner wall of each radiant tube heating section shell (1.1).
4. The ultra-thin gauge non-oriented silicon steel annealing furnace according to claim 1, wherein the heat compensating means is a second resistance strip arranged at the furnace bottom or a second electric radiant tube mounted on a side wall.
5. The ultra-thin gauge non-oriented silicon steel annealing furnace according to claim 1, characterized in that the circulating air duct (9.4) is provided with a plurality of baffles (9.4.1) for individually adjusting the air quantity.
6. The ultra-thin gauge non-oriented silicon steel annealing furnace according to claim 1, characterized in that an isolator (7) is arranged between the electric soaking section (6) and the uniform cooling control section (8) and between the uniform cooling control section (8) and the shielding gas circulation blowing cooling section (9);
the inlet and the outlet of the annealing furnace are respectively provided with an inlet sealing chamber and an outlet sealing chamber, and the inlet sealing chamber, the outlet sealing chamber and each isolator (7) form a shielding gas control system.
7. The ultra-thin gauge non-oriented silicon steel annealing furnace according to claim 6, wherein the shielding gas control system further comprises a mixed gas distribution system, and the mixed gas distribution system is connected with shielding gas inlet holes on each section of furnace body of the annealing furnace;
the mixing gas distribution system comprises a nitrogen-hydrogen mixer (12.1), a regulating valve group (12.2) and a flow regulating valve group (12.3), wherein a nitrogen source and a hydrogen source are connected with the nitrogen-hydrogen mixer (12.1) through pipelines through the regulating valve group (12.2) and the flow regulating valve group (12.3), and the nitrogen-hydrogen mixer (12.1) is connected with a protective gas inlet hole on each section of furnace body.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| KR101185597B1 (en) * | 2007-04-05 | 2012-09-25 | 신닛뽄세이테쯔 카부시키카이샤 | Method of continuous annealing for steel strip with curie point and continuous annealing apparatus therefor |
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|---|---|---|---|---|
| CN201793673U (en) * | 2010-08-25 | 2011-04-13 | 中冶南方(武汉)威仕工业炉有限公司 | Automatic cooling system for heat treatment furnace |
| JP2012087354A (en) * | 2010-10-19 | 2012-05-10 | Jfe Steel Corp | Finish annealing method of grain oriented magnetic steel sheet, and finish annealing facility |
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| CN112195334A (en) * | 2020-09-02 | 2021-01-08 | 中冶南方（武汉）热工有限公司 | Strip steel quenching and tempering system |
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