CN115505695A - Annealing furnace for non-oriented silicon steel with extremely-thin specification - Google Patents
Annealing furnace for non-oriented silicon steel with extremely-thin specification Download PDFInfo
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- CN115505695A CN115505695A CN202211181017.2A CN202211181017A CN115505695A CN 115505695 A CN115505695 A CN 115505695A CN 202211181017 A CN202211181017 A CN 202211181017A CN 115505695 A CN115505695 A CN 115505695A
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- 238000000137 annealing Methods 0.000 title claims abstract description 35
- 229910000976 Electrical steel Inorganic materials 0.000 title claims abstract description 33
- 238000010438 heat treatment Methods 0.000 claims abstract description 81
- 238000001816 cooling Methods 0.000 claims abstract description 75
- 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
- 230000001681 protective effect Effects 0.000 claims abstract description 30
- 238000002347 injection Methods 0.000 claims abstract description 17
- 239000007924 injection Substances 0.000 claims abstract description 17
- 230000005674 electromagnetic induction Effects 0.000 claims abstract description 12
- 238000002791 soaking Methods 0.000 claims abstract description 8
- 238000007789 sealing Methods 0.000 claims description 31
- 239000001257 hydrogen Substances 0.000 claims description 19
- 229910052739 hydrogen Inorganic materials 0.000 claims description 19
- 238000005485 electric heating Methods 0.000 claims description 18
- 230000001105 regulatory effect Effects 0.000 claims description 17
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 16
- 239000011819 refractory material Substances 0.000 claims description 15
- 238000009826 distribution Methods 0.000 claims description 11
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 10
- 238000007664 blowing Methods 0.000 claims description 7
- 229910052757 nitrogen Inorganic materials 0.000 claims description 7
- 230000005855 radiation Effects 0.000 claims description 6
- 239000007921 spray Substances 0.000 claims description 6
- 230000001502 supplementing effect Effects 0.000 claims description 5
- 238000003466 welding Methods 0.000 claims description 3
- 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
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 10
- 238000005507 spraying Methods 0.000 description 7
- 230000006698 induction Effects 0.000 description 6
- 229910052742 iron Inorganic materials 0.000 description 5
- 238000000034 method Methods 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 229910001873 dinitrogen Inorganic materials 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000001276 controlling effect 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
- 238000009792 diffusion process Methods 0.000 description 1
- 230000002349 favourable effect Effects 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
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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
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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
- C21D9/60—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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- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
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- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Heat Treatment Of Strip Materials And Filament Materials (AREA)
Abstract
The invention discloses an ultrathin 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 circulating injection cooling section which are sequentially arranged along the conveying direction of strip steel, wherein the strip steel sequentially passes through the furnace sections. The invention improves the heating efficiency of the heating section, makes the heating more uniform and the heating effect better, is beneficial to the strip steel to form uniform crystalline phase texture and is also beneficial to reducing the emission of nitrogen oxides; a cooling rate of 10 ℃/s or less at a plate temperature of 1000 ℃ is realized; 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 the national new energy strategy and the energy efficiency upgrading policy, the new energy automobile industry is developed vigorously, and the non-oriented silicon steel is one of the core materials of the automobile driving motor, 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 0.5 mm-thick high-grade non-oriented silicon steel is less than 3.5W/kg under the conditions that the magnetic flux density is 1.5T and the frequency is 50Hz, and when the frequency is increased to 400Hz, the iron loss exceeds 80W/kg, so that the requirement of high frequency and low iron loss cannot be met. The thickness of the current non-oriented silicon steel is usually between 0.35mm and 0.5mm, and the thickness of the non-oriented silicon steel for the new energy automobile motor is usually between 0.2 mm and 0.3mm. Therefore, the thinning of the 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 cooling control and the like.
Based on the needs, a silicon steel annealing furnace is urgently needed, and the annealing production requirement of the non-oriented silicon steel with the extremely-thin specification can be met.
Disclosure of Invention
The invention aims to solve the technical problem that aiming at the defects in the prior art, the invention provides the extremely-thin non-oriented silicon steel annealing furnace, which improves the heating efficiency of the heating section, enables the heating to be more uniform and the heating effect to be better, is beneficial to forming uniform crystalline phase texture on strip steel and simultaneously is beneficial to reducing the emission of nitrogen oxides; a cooling rate of 10 ℃/s or less at a plate temperature of 1000 ℃ is realized; 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 1# radiant tube heating section, an electromagnetic induction furnace, a 2# radiant tube heating section, an electric soaking section, an even cooling control section and a protective gas circulating injection cooling section which are sequentially arranged along the conveying direction of strip steel, wherein the strip steel sequentially passes through each furnace section.
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 mode through flanges, and other furnace sections are connected through flange welding.
According to the technical scheme, the structure of 1# radiant tube heating section and 2# radiant tube heating section is the same, all include radiant tube heating section stove outer covering and a plurality of radiant tube, belted steel is along vertically passing radiant tube heating section stove outer covering, a plurality of radiant tubes divide into two sets of arrangements in radiant tube heating section stove outer covering, a set of radiant tube is along belted steel direction of delivery interval arrangement in the stove in proper order in the belted steel top of carrying, another group of radiant tube is along belted steel direction of delivery interval arrangement in proper order in the stove in the belted steel below of carrying, radiant tube's one end is worn out radiant tube heating section stove outer covering and is connected with the nozzle, refractory material has been arranged to the inner wall of radiant tube heating section stove outer covering.
According to the technical scheme, the electric heating section comprises an electric heating section furnace shell, a resistance band and electric radiant tubes, refractory materials are arranged on the inner wall of the electric heating section furnace shell, the electric radiant tubes are arranged above the conveying band steel in the furnace at intervals in sequence along the conveying direction of the band steel in the electric heating section furnace shell, and the resistance band is arranged below the conveying band steel in the furnace along the conveying direction of the band steel in the electric heating section furnace shell and 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 plurality of cooling pipes are divided into two groups and are arranged in the uniform cooling control section furnace shell, one group of cooling pipes are arranged above the conveying band steel in the furnace along the band steel conveying direction at intervals in turn, the other group of cooling pipes are arranged below the conveying band steel in the furnace along the band steel conveying direction at intervals in turn, the heat supplementing device is further arranged in the uniform cooling control section furnace shell, and the inner wall of the uniform cooling control section furnace shell is provided with a refractory material.
According to the technical scheme, the heat supplementing device is a resistance band arranged on the furnace bottom or an electric radiant tube arranged on the side wall.
According to the technical scheme, the protective gas circulation injection cooling section comprises an injection cooling section furnace shell, a heat exchanger, a circulating fan, a circulating air channel and two spraying boxes, wherein the two spraying boxes are respectively arranged above and below the furnace for conveying the strip steel, the inner cavity of the injection cooling section furnace shell is communicated with the inlet end of the circulating fan through the heat exchanger through a pipeline, one end of the circulating air channel is communicated with the outlet end of the circulating fan, and the other end of the circulating air channel penetrates into the injection cooling section furnace shell and is respectively communicated with the two spraying boxes.
According to the technical scheme, the circulating air duct is provided with a plurality of baffles for independently adjusting the air volume.
According to the technical scheme, isolators are arranged between the electric soaking section and the uniform cooling control section and between the uniform cooling control section and the protective gas circulating 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 and 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 the furnace body.
The invention has the following beneficial effects:
1. according to the invention, a combination mode of a 1# radiant tube heating section, an electromagnetic induction furnace and a 2# radiant tube heating section is adopted, so that a higher heating rate than that of a conventional radiant tube is realized, and the heating efficiency is improved; through the electric heating section, the heating effect which is more uniform than that of the conventional radiant tube heating is realized in a high plate temperature range (such as 900-1000 ℃) of the strip steel, the strip steel is favorable for forming uniform crystalline phase texture, and the emission of nitrogen oxides is reduced; the cooling rate of 10 ℃/s or even lower at the plate temperature of 1000 ℃ can be realized through the arranged uniform cooling control section; the strip steel plate type is adjusted, controlled and finally cooled through the protective gas circulation injection cooling section, and the process requirements of the ultrathin strip steel are met.
2. Through the protective gas control system, different atmospheres can be used in different furnace sections, and the stability of atmosphere components and the stability of furnace pressure in the furnace are realized.
Drawings
FIG. 1 is a schematic structural view of an annealing furnace for ultra-thin gauge non-oriented silicon steel according to an embodiment of the present invention;
FIG. 2 isbase:Sub>A cross-sectional view A-A of FIG. 1;
FIG. 3 is a cross-sectional view B-B of FIG. 1;
FIG. 4 is a cross-sectional view C-C of FIG. 1;
FIG. 5 is a cross-sectional view D-D of FIG. 1;
FIG. 6 is a front view of a cooling section of a shielding gas injection circuit according to 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 air distribution system in an embodiment of the present invention;
in the figure, 1-an inlet sealing chamber, a 2-1# radiant tube heating section, 3-an induction furnace, a 4-2# radiant tube heating section, 5-an electric heating section, 6-a soaking section, 7-an isolator, 8-a uniform cooling control section, 9-a protective gas circulation blowing cooling section, 10-an outlet sealing chamber and 11-a protective gas inlet hole;
1.1-furnace shell, 1.2-refractory material, 1.3-radiant tube and 1.4-burner;
5.1-furnace shell, 5.2-refractory material, 5.3-resistance band and 5.4-electric radiation tube;
8.1-furnace shell, 8.2-refractory material, 8.3-cooling tube, 8.4-resistance band or electric radiation tube;
9.1-furnace shell, 9.2-heat exchanger, 9.3-circulating fan, 9.4-circulating air duct, 9.4.1-baffle and 9.5-spray box;
12.1-nitrogen-hydrogen mixer, 12.2-regulating valve group and 12.3-flow regulating valve group.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and examples.
Referring to fig. 1 to 8, the annealing furnace for ultra-thin non-oriented silicon steel in one embodiment of the invention comprises a 1# radiant tube heating section 2, an electromagnetic induction furnace 3, a 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.
Furthermore, the combination of the heating section of the No. 1 radiant tube, the electromagnetic induction furnace and the heating section of the No. 2 radiant tube is used for rapid heating, and the average heating rate can reach 30-35 ℃/s and is far higher than that of the conventional heating section of the radiant tube; the heating sections of the No. 1 and No. 2 radiant tubes carry out radiant heating on the band steel through gas radiant tubes, the radiant tubes are respectively arranged at the upper part and the lower part of the band steel, and the radiant tubes can be used in combination of one or more of I type, U type and W type; the electromagnetic induction furnace is arranged between the 1# radiant tube heating section and the 2# radiant tube heating section, and the strip steel is rapidly heated through the electromagnetic induction principle, so that the average heating rate is improved. The electromagnetic induction furnace is connected and sealed with the heating section of the radiant tube through a flange.
Furthermore, the electromagnetic induction furnace is respectively connected with the 1# radiant tube heating furnace and the 2# radiant tube heating furnace in a sealing mode through flanges, and other furnace sections are connected through flanges in a welding mode.
Further, the structure of the No. 1 radiant tube heating section 2 is the same as that of the No. 2 radiant tube heating section 4, the radiant tube heating section comprises a radiant tube heating section furnace shell 1.1 and a plurality of radiant tubes 1.3, the band steel longitudinally penetrates through the radiant tube heating section furnace shell 1.1, the 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 band steel conveyed in the furnace along the band steel conveying direction at intervals, the other group of radiant tubes 1.3 are sequentially arranged below the band steel conveyed in the furnace along the band steel conveying direction at intervals, one ends of the radiant tubes 1.3 penetrate through the radiant tube heating section furnace shell 1.1 to be connected with burners 1.4, and the inner wall of the radiant tube heating section furnace shell 1.1 is provided with refractory materials 1.2.
Further, the radiant tube 1.3 can be used in combination of one or more of I-shaped, U-shaped and W-shaped.
Further, the electric heating section comprises an electric heating section furnace shell 5.1, a resistance band 5.3 and an electric radiation tube 5.4, a refractory material 5.2 is arranged on the inner wall of the electric heating section furnace shell 5.1, the electric radiation tube 5.4 is arranged above the conveying band steel in the furnace at intervals along the conveying direction of the band steel in the electric heating section furnace shell 5.1, and the resistance band 5.3 is arranged below the conveying band steel in the furnace along the conveying direction of the band steel in the electric heating section furnace shell 5.1 and arranged at the bottom of the electric heating section furnace shell 5.1.
Further, even accuse cold section is including even accuse cold section stove outer covering 8.1 and a plurality of cooling tube 8.3, a plurality of cooling tube 8.3 divide into two sets ofly set up in even accuse cold section stove outer covering 8.1, a set of cooling tube 8.3 is arranged in the stove along belted steel direction of delivery in proper order the interval and is carried belted steel top in the stove, another group of cooling tube 8.3 is arranged in stove along belted steel direction of delivery in proper order the interval and is carried belted steel below in the stove, heat supplementing device has still been arranged in even accuse cold section stove outer covering 8.1, be equipped with refractory material 8.2 on the inner wall of even accuse cold section stove outer covering 8.1.
Furthermore, the uniform cooling control section achieves the purpose of accurately controlling the cooling rate of the strip steel through the combined design of heating and cooling equipment.
Further, the heat compensating device is a resistance band 8.4 arranged at the bottom of the furnace or an electric radiant tube 8.4 arranged on a side wall.
Further, the cooling pipe 8.3 is in an I shape or a U shape.
Further, the protective gas circulation injection cooling section 9 comprises an injection cooling section furnace shell 9.1, a heat exchanger 9.2, a circulating fan 9.3, a circulating air duct 9.4 and two spraying boxes 9.5, wherein the two spraying boxes 9.5 are respectively arranged above and below the steel conveying belt in the furnace, an inner cavity of the injection cooling section furnace shell 9.1 is communicated with an inlet end of the circulating fan 9.3 through the heat exchanger through a pipeline, one end of the circulating air duct 9.4 is communicated with an outlet end of the circulating fan 9.3, and the other end of the circulating air duct 9.4 penetrates into the injection cooling section furnace shell 9.1 and is respectively communicated with the two spraying boxes 9.5.
Furthermore, the circulating air duct 9.4 is provided with a plurality of baffles 9.4.1 for independently adjusting the air volume; the number of baffles 9.4.1 is 5.
Furthermore, the protective gas in the furnace is cooled by a heat exchanger 9.2, and is sprayed to the surface of the strip steel by a circulating fan 9.3 through a circulating air duct 9.4 and spray boxes 9.5 arranged above and below the strip steel to cool the strip steel. The circulating air duct 9.4 is provided with five baffles 9.4.1 which can independently adjust the air quantity, and the baffles can be operated manually or automatically.
Furthermore, isolators 7 are arranged between the electric uniform heating section 6 and the uniform cooling control section 8 and between the uniform cooling control section 8 and the protective gas circulation blowing cooling section 9; isolator equipment is arranged among the furnace sections according to the process requirement, the isolators are arranged at the positions where the atmosphere isolation is required, 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 front furnace section and the rear furnace section is isolated through a sealing baffle plate and a diffusion channel of the isolators, so that the atmosphere of the front furnace section and the atmosphere of the rear furnace section can not be connected in series;
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 No. 1 radiant tube heating section 2 and the outlet of the protective gas circulation blowing cooling section 9; the air outside the furnace is controlled not to enter the furnace through the sealing roller, the sealing door and the sealing baffle.
The inlet seal chamber, the outlet seal chamber and the isolators 7 form a shielding gas control system
Furthermore, the protective gas control system also comprises a mixed gas distribution system, and the mixed gas distribution system is connected with the protective gas inlet holes on each section of the 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 via the regulating valve group 12.2 and the flow regulating valve group 12.3, and the nitrogen-hydrogen mixer 12.1 is connected with the protective gas inlet holes on each section of the furnace body through pipelines.
The working principle of the invention is as follows: as shown in figure 1, the ultrathin non-oriented silicon steel annealing furnace provided by the embodiment of the invention comprises an inlet sealing chamber 1, a 1# radiant tube heating section 2, an induction furnace 3, a 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 circulating injection cooling section 9, an outlet sealing chamber 10 and a protective gas inlet hole 11
Wherein 1# radiant tube heating section 2 and induction furnace 3, through flange and sealed 3.1 connection between induction furnace 3 and 2# radiant tube heating section 4, through flange welded connection between other stove sections.
The radiant tube heating section comprises a furnace shell 1.1, refractory materials 1.2, radiant tubes 1.3, burners 1.4 and the like. The radiant tubes 1.3 are arranged at the upper and lower parts of the strip. The radiant tube 1.3 can adopt one or a combination of I type, U type and W type.
The electric heating section consists of a furnace shell 5.1, refractory materials 5.2, a resistance band 5.3, an electric radiant tube 5.4 and the like. The resistive strip 5.3 is arranged in the lower part of the strip steel and the electric radiant tubes 5.4 are arranged in the upper part of the strip steel.
The uniform cooling control section comprises a furnace shell 8.1, refractory materials 8.2, cooling tubes 8.3, a resistance band 8.4 or electric radiant tubes 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 adopt an I shape or a U shape. The heat supplementing device can adopt a resistance band 8.4 arranged on the furnace bottom or an electric radiant tube (8.4) arranged on a side wall.
The protective gas circulation blowing cooling section comprises a furnace shell 9.1, a heat exchanger 9.2, a circulating fan 9.3, a circulating air duct 9.4, a spraying box 9.5 and the like. The protective gas in the furnace is cooled by a heat exchanger 9.2 and is blown to the surface of the strip steel by a circulating fan 9.3 through a circulating air duct 9.4 and a spray box 9.5 arranged above and below the strip steel to cool the strip steel. The circulating air duct 9.4 is provided with five baffles 9.4.1 which can independently adjust the air quantity, and the baffles can be operated manually or automatically.
The shielding gas control system included in 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 protective 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 protective 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 air outside the furnace is controlled not to enter the furnace through the sealing roller 1.1, the sealing door 1.2 and the sealing baffle 1.3.
The isolator 7 isolates the atmospheres of the front and rear furnace sections through the sealing baffle 7.1 and the diffusing channel 7.2, so that the atmospheres in the front and rear of the isolator can not be connected with each other.
Mix gas distribution system by nitrogen hydrogen blender 12.1, nitrogen gas and hydrogen regulating valve group 12.2 before the nitrogen hydrogen blender, flow regulating valve group 12.3 constitutes behind the blender, through nitrogen hydrogen and hydrogen regulating valve group 12.2, mix nitrogen gas and hydrogen in blender 12.1 according to the proportion of difference, later flow regulating valve group 12.3 through behind the blender, control the gas flow of different sections of furnace, let in hole 11 through the protective gas that sets up on each section furnace body, let in the nitrogen hydrogen gas mixture to use in the annealing stove.
In conclusion, the ultrathin non-oriented silicon steel annealing furnace provided by the invention solves the problems of low heating rate, low heating uniformity, poor control precision of cooling rate control, easiness in generation of edge waves and the like when the conventional silicon steel annealing furnace is used for producing non-oriented silicon steel for new energy automobiles. The production requirements 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 innovative value is outstanding.
The above is only a preferred embodiment of the present invention, and certainly, the scope of the present invention should not be limited thereby, and therefore, the present invention is not limited by the scope of the claims.
Claims (10)
1. The utility model provides an extremely thin specification non-oriented silicon steel annealing stove, its characterized in that includes 1# radiant tube heating section (2), electromagnetic induction stove (3), 2# radiant tube heating section (4), electric heating section (5), electric soaking section (6), even accuse cold section (8) and protective gas circulation jetting cooling zone (9) that arrange along belted steel direction of delivery in proper order, and belted steel passes in proper order from each stove section.
2. The ultra-thin gauge non-oriented silicon steel annealing furnace of claim 1, wherein the electromagnetic induction furnace is connected with the 1# radiant tube heating furnace and the 2# radiant tube heating furnace by flange sealing, and the other furnace sections are connected by flange welding.
3. The ultra-thin gauge non-oriented silicon steel annealing furnace according to claim 1, wherein the No. 1 radiant tube heating section (2) and the No. 2 radiant tube heating section (4) have the same structure and respectively comprise a radiant tube heating section furnace shell (1.1) and a plurality of radiant tubes (1.3), the strip steel longitudinally passes through the radiant tube heating section furnace shell (1.1), the radiant tubes (1.3) are divided into two groups and 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 ends of the radiant tubes (1.3) penetrate through the radiant tube heating section furnace shell (1.1) to be connected with burners (1.4), and the inner wall of the radiant tube heating section furnace shell (1.1) is provided with refractory materials (1.2).
4. The ultra-thin gauge non-oriented silicon steel annealing furnace according to claim 1, wherein the electrical heating section comprises an electrical heating section furnace shell (5.1), resistance bands (5.3) and electrical radiation tubes (5.4), refractory materials (5.2) are arranged on the inner wall of the electrical heating section furnace shell (5.1), the electrical radiation tubes (5.4) are sequentially arranged above the conveying strip steel in the furnace at intervals along the conveying direction of the strip steel in the electrical heating section furnace shell (5.1), the resistance bands (5.3) are arranged below the conveying strip steel in the furnace along the conveying direction of the strip steel in the electrical heating section furnace shell (5.1), and are arranged at the bottom of the electrical heating section furnace shell (5.1).
5. The ultra-thin gauge non-oriented silicon steel annealing furnace according to claim 1, wherein the uniform cooling control section comprises a uniform cooling control section furnace shell (8.1) and a plurality of cooling pipes (8.3), the plurality of cooling pipes (8.3) are divided into two groups and arranged in the uniform cooling control section furnace shell (8.1), one group of cooling pipes (8.3) are sequentially arranged above the conveying strip steel in the furnace along the conveying direction of the strip steel, the other group of cooling pipes (8.3) are sequentially arranged below the conveying strip steel in the furnace along the conveying direction of the strip steel, a heat supplementing device is further arranged in the uniform cooling control section furnace shell (8.1), and the inner wall of the uniform cooling control section furnace shell (8.1) is provided with refractory materials (8.2).
6. The ultra-thin gauge non-oriented silicon steel annealing furnace according to claim 5, wherein the heat compensating means is a resistance band (8.4) disposed at the bottom of the furnace or an electric radiant tube (8.4) installed on the side wall.
7. The ultra-thin gauge non-oriented silicon steel annealing furnace according to claim 1, wherein the protective gas circulation injection cooling section (9) comprises an injection cooling section furnace shell (9.1), a heat exchanger (9.2), a circulating fan (9.3), a circulation air duct (9.4) and two spray boxes (9.5), the two spray boxes (9.5) are respectively arranged above and below the strip steel conveyed in the furnace, an inner cavity of the injection cooling section furnace shell (9.1) is communicated with an inlet end of the circulating 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 circulating 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 spray boxes (9.5).
8. The ultra-thin gauge non-oriented silicon steel annealing furnace according to claim 7, wherein the circulating air duct (9.4) is provided with a plurality of baffles (9.4.1) for individually adjusting air volume.
9. The ultra-thin gauge non-oriented silicon steel annealing furnace according to claim 1, wherein isolators (7) are arranged between the electric uniform heating section (6) and the uniform cooling control section (8) and between the uniform cooling control section (8) and the protective gas circulation blowing cooling section (9);
an inlet sealing chamber and an outlet sealing chamber are respectively arranged at the inlet and the outlet of the annealing furnace, and the inlet sealing chamber, the outlet sealing chamber and each isolator (7) form a protective gas control system.
10. The ultra-thin gauge non-oriented silicon steel annealing furnace of claim 9, wherein the shielding gas control system further comprises a mixed gas distribution system, and the mixed gas distribution system is connected with the shielding gas inlet holes on each section of the furnace body of the annealing furnace;
the mixed gas distribution system comprises a nitrogen-hydrogen mixer (12.1), a regulating valve bank (12.2) and a flow regulating valve bank (12.3), wherein a nitrogen source and a hydrogen source are connected with the nitrogen-hydrogen mixer (12.1) through pipelines via the regulating valve bank (12.2) and the flow regulating valve bank (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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| US20100101690A1 (en) * | 2007-04-05 | 2010-04-29 | Shigenobu Koga | Method for continously annealing steel strip having a curie point and continous annealing facility of the same |
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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 |
| CN113802079A (en) * | 2021-08-18 | 2021-12-17 | 马钢(合肥)板材有限责任公司 | Method for producing aluminum-plated silicon steel strip with high surface quality |
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| US20100101690A1 (en) * | 2007-04-05 | 2010-04-29 | Shigenobu Koga | Method for continously annealing steel strip having a curie point and continous annealing facility of the same |
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| 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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