CN102534181A - High temperature annealing air distribution system in orientation silicon steel strip coil bell type furnace - Google Patents
High temperature annealing air distribution system in orientation silicon steel strip coil bell type furnace Download PDFInfo
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- CN102534181A CN102534181A CN2012100207826A CN201210020782A CN102534181A CN 102534181 A CN102534181 A CN 102534181A CN 2012100207826 A CN2012100207826 A CN 2012100207826A CN 201210020782 A CN201210020782 A CN 201210020782A CN 102534181 A CN102534181 A CN 102534181A
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Abstract
The invention provides a high temperature annealing air distribution system in an orientation silicon steel strip coil bell type furnace, which comprises an air supply pipeline, a water vapor channel and an air return pipeline. The air supply pipeline extends into the inside of the bell type furnace from a centre position of the bottom of the bell type furnace and is lifted to the top of the highest steel strip coil in the bell type furnace, and air outlet through holes are evenly drilled on the pipe wall in the radial direction and the axial direction. Water vapor through holes are arranged on a horizontal bearing support plate body used for bearing each layer of steel strip coils in the bell type furnace, and the air return pipeline is an annular pipeline arranged at the bottom in the furnace close to the inner wall of an outer cover. The air distribution system enables atmosphere in the furnace to be even, and maintains balance of air inlet and air outlet for a long time. When the cover is uncovered, hydrogen in the furnace is exhausted, and the air distribution system eliminates potential safety hazard, prevents steel strip surface to be oxidized, guarantees safety in the furnace, and is high in product quality.
Description
Technical field
The present invention relates to the gas distribution technology of high temperature annealing in a kind of oriented silicon steel roll coil of strip bell furnace, specifically be applied to the high-temperature heat treatment of the oriented silicon steel roll coil of strip in the bell furnace, function of dominant property technical field of magnetic materials.
Background technology
Oriented silicon steel band is a kind of novel functional magneticsubstance, because its resistance is big, so in the operational process, the electric energy that consumes on the iron core is little; Because its magnetization has the intensive directivity, so the magnetic strength on the required direction is high; The utilization ratio of iron core is high, and operational efficiency is high, and the cold-rolled orientation silicon steel band is the topmost core material of most critical in the electromagnetic oriented conversion products such as X-former, mutual inductor; The production technology level of cold-rolled orientation silicon steel band; Be directly connected to the upgrading of a large amount of X-formers of country, be directly connected to the utilising efficiency of national energy, the sustainable development and the people's lives of it and national economy are closely bound up.Disclose according to electrical steel branch of The Chinese Society for Metals " 2010 Chinese electrical steel industry development annual report "; Domestic 78.6 ten thousand tons of the oriented silicon steel bands that consume altogether in 2010; Wherein import is 23.6 ten thousand tons; Import accounts for 30% of domestic total flow, and the cold-rolled orientation silicon steel band is the product that national long-range policy is helped.Cold-rolled orientation silicon steel band complex manufacturing, parameter window is narrow, the operation process is long, with high content of technology and be described as the artwork in the steel products.
The production technique of oriented silicon steel band is:
1. hot rolled coil (raw material): specification be generally thick * wide=(2.0mm-2.5mm) * (1300mm-1350mm), the heavy 20-25 ton of volume, carbon content is 0.03-0.05%, silicon content is 2.8-3.4%, manganese content is 0.05-0.1%, sulphur content is 0.02-0.03%.
2. pickling: the red stone that removes steel strip surface.
3. once cold rolling: 2.0mm-2.5mm rolls 0.6mm-0.7mm from thickness, rolls the 3-4 passage usually.
4. process annealing: internal stress, part decarburization and the surface of removing once cold rolling generate silicon-dioxide (SiO
2).
5. secondary cold-rolling: 0.6mm-0.7mm rolls 0.28mm-0.3mm from thickness, rolls the 2-3 passage usually.
6. decarburizing annealing is coated with Natural manganese dioxide: be coated with one deck Natural manganese dioxide sealing coat in steel strip surface.
7. high temperature annealing: the high technology temperature of steel band is 1180 ℃, between 1000 ℃-1100 ℃, and the silicon-dioxide (SiO that generates in steel strip surface in the previous process
2) Natural manganese dioxide that is coated with steel strip surface reacts, and generated one deck insulating Magnesium Silicate q-agent (Mg in steel strip surface
2SiO
4) bottom.
8. hot drawing annealing japanning: steel strip surface is coated with insullac and steel band stretching and leveling.
9. pack: pack on request.
For reaching various technology purposes, the oriented silicon steel roll coil of strip need carry out above-mentioned high temperature annealing, and its technology is:
1. be heated to 650 ℃-700 ℃ to steel coil strip with the temperature rise rate of 50 ℃/h, atmosphere is nitrogen.
2. steel coil strip is incubated under 650 ℃ of-700 ℃ of temperature, and atmosphere is nitrogen and hydrogen mixture.
3. be heated to 1180 ℃-1200 ℃ to steel coil strip with the temperature rise rate of 15 ℃/h, atmosphere is nitrogen and hydrogen mixture.
4. steel coil strip is incubated under 1180 ℃ of-1200 ℃ of temperature, and atmosphere is hydrogen.
5. steel coil strip is cooled to 700 ℃ with stove, and atmosphere is nitrogen and hydrogen mixture.
6. steel coil strip continues to be cooled to 300 ℃ with stove, and atmosphere is nitrogen.
7. steel coil strip is come out of the stove and in environment, is cooled to envrionment temperature.
The high temperature annealing of steel coil strip has two kinds of modes, and a kind of is in annular continuous oven, to anneal, and a kind of is in bell furnace, to anneal.Because of the bell furnace floor space is little, technology controlling and process reliably is widely used.
Steel coil strip supporting plate form in the common bell furnace and the atmosphere in the bell furnace supply return-air technology as shown in Figure 1, and the atmosphere in the supporting plate of common steel coil strip and the bell furnace supplies the return-air process schematic representation:
1. the supporting plate of the steel coil strip in the bell furnace is a blind plate.
2. atmosphere is concentrated from the furnace bottom center and is infeeded, and around the furnace bottom outer rim, returns.
There is following several respects shortcoming in above-mentioned technology:
One. gas distribution is inhomogeneous in the stove.
Because gas part is to concentrate from the furnace bottom center to infeed in the stove, around stove inner bottom part outer rim, return come out of the stove outside, and furnace atmosphere has back pressure; This just can't guarantee that the atmosphere that infeeds can arrive furnace roof, again because of temperature in the stove is very high, and 1180 ℃-1200 ℃ of Gao Shida; Under high like this temperature; Be machinery can't be installed make the atmosphere in the stove carry out the positive mechanical round-robin in stove, therefore, infeed atmosphere in the stove and will directly walk short circuit in the lower place of stove inner height and get into return-air hole and discharge out of the furnace.
Because atmosphere is inhomogeneous, make that the temperature in the stove is also inhomogeneous, this just makes that the quality product in the stove is inconsistent.
Two. there is security risk
Steel coil strip is carried out in the process of pyroprocessing in bell furnace; Atmosphere arrangement in the stove is: nitrogen-nitrogen and hydrogen mixture-hydrogen-nitrogen and hydrogen mixture-nitrogen; Steel coil strip is packed in the process that heats up behind the bell furnace; Initial to in-furnace nitrogen supply gas, purpose is before in-furnace nitrogen supply hydrogen gas mixture, cleans the oxygen in the stove.Equally, steel coil strip carries out preparing to open before the cover after pyroprocessing finishes in bell furnace, and to in-furnace nitrogen supply gas, purpose is to clean the hydrogen in the nitrogen and hydrogen mixture in the stove.But under same situation, nitrogen proportion is heavier than hydrogen, by the confession return-air technology of above-mentioned bell furnace; Because of can't guaranteeing that nitrogen can be fed to furnace roof, cause the steel coil strip high temperature annealing that carries out high temperature annealing in the bell furnace of packing into to finish after, when bell furnace is taken off cover; Hydrogen is still being gathered on the cover top, and at this moment, existing oxygen in the cover; Like naked light, will explode.
Three. the inner steam of coil of strip is arranged unclean, influences quality product
The steel coil strip of carrying out high temperature annealing in the bell furnace of packing into is the oriented silicon steel roll coil of strip, after steel strip surface has been coated with Natural manganese dioxide (MgO), is rolled into coil of strip to it again, and Natural manganese dioxide (MgO) has added water (H in the Natural manganese dioxide (MgO) when applying
2O), therefore, handle, still have a large amount of Natural manganese dioxide (MgO) will be hydrolyzed into Marinco H Mg (OH) though carried out oven dry after being coated with
2, steel coil strip is packed into and is carried out in the process of high temperature annealing Marinco H Mg (OH) behind the bell furnace
2In the time of 350 ℃-450 ℃, will decomposite constitution water, Marinco H Mg (OH)
2Again resolve into Natural manganese dioxide (MgO), must discharge out of the furnace and decompose the water that generates.
But the supporting plate by above-mentioned steel coil strip is a blind plate, and the steam that invar roll coil of strip interlayer forms is more great than the ratio of bell-type furnace atmosphere; The steam of steel coil strip interlayer can not make progress away, and should walk downwards, but nonpassage again downwards; Cause steam to gather the interlayer of middle steel coil strip; At high temperature, water makes the steel strip surface oxidation, causes quality product to worsen.
Summary of the invention
The present invention provides the gas distribution system of high temperature annealing in a kind of oriented silicon steel roll coil of strip bell furnace, can make furnace atmosphere even, keeps air inlet and the equilibrium state of giving vent to anger for a long time, prevents the steel strip surface oxidation, guarantees security in the stove, and quality product is high.
The present invention realizes through following technical scheme:
The gas distribution system of high temperature annealing in a kind of oriented silicon steel roll coil of strip bell furnace; Comprise air-supply duct, vapor channel and return-air duct; Said air-supply duct stretches into bell furnace inside by the bell furnace bottom centre position, and is increased in the bell furnace top of high steel coil strip, the pipe section of air-supply duct in bell furnace; Its tube wall is arranged and can be made interior each layer steel coil strip of bell furnace accept the duct of giving vent to anger of atmosphere fully, and the air-supply duct top is a blind hole; Said aqueous vapor passage is on bell furnace inside is used to carry the horizontal bearing support plate body of every layer of steel coil strip, the steam through hole to be set; Said return-air duct is to be laid in the circulating line of stove inner bottom part near bell furnace outer cover inwall, and inboard at horizontal radial on the tube wall of said circulating line, evenly cloth drills through the hole, and the internal diameter of said return-air duct is greater than the internal diameter of air-supply duct.
The said duct of giving vent to anger is evenly distributed on the radial and axial position of the tube wall of air-supply duct.
The inner hole section that the said duct total sectional area sum of giving vent to anger is less than or equal to air-supply duct amasss.
Said steam through hole is to be distributed in the some elongated slots that carry on the support plate.
Said elongated slot is to be distributed on the different circumference that carry support plate.
The length direction of said elongated slot is for carrying support plate radially.
The inner hole section that through hole total sectional area sum on the said return-air duct is less than or equal to return-air duct amasss.
Beneficial effect of the present invention is:
1. the atmosphere homogeneous in the bell furnace.
2. when bell furnace was taken off cover, the hydrogen in the cover was cleaned, and has eliminated potential safety hazard.
3. the steam of guaranteeing the steel coil strip interlayer has the passage of vapor pervious downwards, has alleviated the oxidation on steel coil strip surface, has guaranteed quality and quality product consistent of product.
Description of drawings
Fig. 1 is the synoptic diagram of the bell furnace pyroprocessing steel band of prior art
Fig. 2 is the synoptic diagram of gas distribution system of the present invention
Fig. 3 is the synoptic diagram of one embodiment of the present invention
1-supports inner core, and 2-supports urceolus, 3-stove outer cover, 4-muffler, 5-base, 6-air-supply duct, the 601-duct of giving vent to anger, and 7-carries support plate, 701-elongated slot, the 8-oriented silicon steel roll coil of strip;
I-elongated slot width.
Embodiment
Below in conjunction with accompanying drawing, the present invention is further specified.
Like Fig. 2, be the synoptic diagram of gas distribution system of the present invention, comprise air-supply duct 6, vapor channel and return-air duct.
The upper, middle and lower dress oriented silicon steel roll coil of strip 8 coil of strips three are rolled up totally in the stove.Air-supply duct 6 stretches into bell furnace inside by the bell furnace bottom centre position, and is increased to the upper surface of going up a coil band in the bell furnace most.The pipe section of air-supply duct in bell furnace, its tube wall radial and axial all evenly ground auger cloth go out vent hole 601, the pipeline top is a blind hole.The pipe section of air-supply duct in bell furnace, it is long-pending that the through hole total sectional area sum of giving vent to anger of the cloth that bores is less than or equal to the inner hole section of air-supply duct on its tube wall.The material of air-supply duct is Cr
25Ni
35
The aqueous vapor passage is on bell furnace inside is used to carry the horizontal bearing support plate body 7 of every layer of steel coil strip 8, the steam through hole to be set.The steam through hole is to be distributed in the some elongated slots 701 that carry on the support plate.Elongated slot is to be distributed on the different circumference that carry support plate, and the distance of arc length is between 600～800mm between adjacent two elongated slots that distribute on the same circumference.The width I of elongated slot is between 10～30mm.The length direction of elongated slot is for carrying support plate radially.
Return-air duct 4 is to be laid in the circulating line of stove inner bottom part near the outer cover inwall.On the tube wall of circulating line, inboard at horizontal radial, be uniformly distributed with and drill through the hole, the inner hole section that through hole total sectional area sum is less than or equal to return-air duct amasss, and the internal diameter of return-air duct is greater than the internal diameter of air-supply duct.
The material of return-air duct is Cr
25Ni
35
Below in conjunction with Fig. 3 and embodiment, the present invention is further specified.Like Fig. 3, be the synoptic diagram of one embodiment of the present invention, the dash area that carries support plate is the oriented silicon steel roll coil of strip and the contact part of carrying support plate.
The following process step of concrete employing:
(1), the tonburden of the oriented silicon steel roll coil of strip is 3 volumes in the bell furnace.
(2), the interior total length of the stove of processing atmosphere air-supply duct is 2500mm in the stove of bell furnace.
(3), the material of processing atmosphere air-supply duct is Cr in the stove of bell furnace
25Ni
35
(4), the specification of processing atmosphere air-supply duct is ￠ 25mm * 2.0mm in the stove of bell furnace.
(5), the processing atmosphere air-supply duct is axially every in the stove of bell furnace sets out the pore road at a distance from 100mm two ends on same diametric(al), axially the radially angle in the neighbouring duct of giving vent to anger is 180 ℃.
(6), processing atmosphere air-supply duct top is a blind hole in the stove of bell furnace.
(7), the pore road of leaving is ￠ 3.0mm on the interior processing atmosphere air-supply duct of the stove of bell furnace.
(8), open 14 elongated slots on the carrying support plate of steel coil strip, on the same circumference distance between adjacent two elongated slots at the 800mm two ends of arc length distance.
(9), the length of elongated slot is 200mm, the elongated slot through hole be distributed as radially three rows, 14 elongated slots of present embodiment can reach every row and all on its circumference, be uniformly distributed with.
(10), the width of elongated slot through hole is 20mm.
(11), the length direction of elongated slot through hole is for carrying support plate radially.
The following process step of concrete employing:
(1), the tonburden of the oriented silicon steel roll coil of strip is 1 volume in the bell furnace.
(2), the interior total length of the stove of processing atmosphere air-supply duct is 850mm in the stove of bell furnace.
(3), the material of processing atmosphere air-supply duct is Cr in the stove of bell furnace
25Ni
35
(4), the specification of processing atmosphere air-supply duct is ￠ 8mm * 1.0mm in the stove of bell furnace.
(5), the processing atmosphere air-supply duct is axially every in the stove of bell furnace sets out the pore road at a distance from 30mm two ends on same diametric(al), axially the radially angle in the neighbouring duct of giving vent to anger is 180 ℃.
(6), processing atmosphere air-supply duct top is a blind hole in the stove of bell furnace.
(7), the pore road of leaving is ￠ 1.0mm on the interior processing atmosphere air-supply duct of the stove of bell furnace.
(8), open 14 elongated slots on the carrying support plate of steel coil strip, on the same circumference distance between adjacent two elongated slots at the 600mm two ends of arc length distance.
(9), the length of elongated slot is 200mm, the elongated slot through hole be distributed as radially three rows, 14 elongated slots of present embodiment can reach every row and all on its circumference, be uniformly distributed with.
(10), the width of elongated slot through hole is 10mm.
(11), the length direction of elongated slot through hole is for carrying support plate radially.
The following process step of concrete employing:
(1), the tonburden of the oriented silicon steel roll coil of strip is 2 volumes in the bell furnace.
(2), the interior total length of the stove of processing atmosphere air-supply duct is 1300mm in the stove of bell furnace.
(3), the material of processing atmosphere air-supply duct is Cr in the stove of bell furnace
25Ni
35
(4), the specification of processing atmosphere air-supply duct is ￠ 12mm * 2.0mm in the stove of bell furnace.
(5), the processing atmosphere air-supply duct is axially every in the stove of bell furnace sets out the pore road at a distance from 65mm two ends on same diametric(al), axially the radially angle in the neighbouring duct of giving vent to anger is 180 ℃.
(6), processing atmosphere air-supply duct top is a blind hole in the stove of bell furnace.
(7), the pore road of leaving is ￠ 2.0mm on the interior processing atmosphere air-supply duct of the stove of bell furnace.
(8), open 14 elongated slots on the carrying support plate of steel coil strip, on the same circumference distance between adjacent two elongated slots at the 700mm two ends of arc length distance.
(9), the length of elongated slot is 200mm, the elongated slot through hole be distributed as radially three rows, 14 elongated slots of present embodiment can reach every row and all on its circumference, be uniformly distributed with.
(10), the width of elongated slot through hole is 20mm.
(11), the length direction of elongated slot through hole is for carrying support plate radially.
Claims (7)
1. the gas distribution system of high temperature annealing in the oriented silicon steel roll coil of strip bell furnace; Comprise air-supply duct, vapor channel and return-air duct; It is characterized in that said air-supply duct stretches into bell furnace inside by the bell furnace bottom centre position, and be increased in the bell furnace top of high steel coil strip, the pipe section of air-supply duct in bell furnace; Its tube wall is arranged and can be made interior each layer steel coil strip of bell furnace accept the duct of giving vent to anger of atmosphere fully, and the air-supply duct top is a blind hole; Said aqueous vapor passage is on bell furnace inside is used to carry the horizontal bearing support plate body of every layer of steel coil strip, the steam through hole to be set; Said return-air duct is to be laid in the circulating line of stove inner bottom part near bell furnace outer cover inwall, and inboard at horizontal radial on the tube wall of said circulating line, evenly cloth drills through the hole, and the internal diameter of said return-air duct is greater than the internal diameter of air-supply duct.
2. the gas distribution system of high temperature annealing is characterized in that the said duct of giving vent to anger is evenly distributed on the radial and axial position of the tube wall of air-supply duct in a kind of oriented silicon steel roll coil of strip bell furnace as claimed in claim 1.
3. the gas distribution system of high temperature annealing in according to claim 1 or claim 2 a kind of oriented silicon steel roll coil of strip bell furnace, it is long-pending to it is characterized in that the said duct total sectional area sum of giving vent to anger is less than or equal to the inner hole section of air-supply duct.
4. the gas distribution system of high temperature annealing in a kind of oriented silicon steel roll coil of strip bell furnace as claimed in claim 1 is characterized in that said steam through hole is to be distributed in the some elongated slots that carry on the support plate.
5. the gas distribution system of high temperature annealing in a kind of oriented silicon steel roll coil of strip bell furnace as claimed in claim 4 is characterized in that said elongated slot is to be distributed on the different circumference that carry support plate.
6. like the gas distribution system of high temperature annealing in claim 4 or the 5 described a kind of oriented silicon steel roll coil of strip bell furnaces, the length direction that it is characterized in that said elongated slot is for carrying support plate radially.
7. the gas distribution system of high temperature annealing in a kind of oriented silicon steel roll coil of strip bell furnace as claimed in claim 1, it is long-pending to it is characterized in that through hole total sectional area sum on the said return-air duct is less than or equal to the inner hole section of return-air duct.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210020782.6A CN102534181B (en) | 2012-01-30 | 2012-01-30 | High temperature annealing air distribution system in orientation silicon steel strip coil bell type furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210020782.6A CN102534181B (en) | 2012-01-30 | 2012-01-30 | High temperature annealing air distribution system in orientation silicon steel strip coil bell type furnace |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102534181A true CN102534181A (en) | 2012-07-04 |
| CN102534181B CN102534181B (en) | 2014-01-29 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210020782.6A Active CN102534181B (en) | 2012-01-30 | 2012-01-30 | High temperature annealing air distribution system in orientation silicon steel strip coil bell type furnace |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105018715A (en) * | 2015-08-24 | 2015-11-04 | 武汉富瑞能源科技有限公司 | Horizontal type bell furnace |
| CN106011452A (en) * | 2016-07-09 | 2016-10-12 | 新万鑫（福建）精密薄板有限公司 | In-furnace air pressure control device and method of oriented silicon steel high-temperature bell type furnace |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4475369A (en) * | 1982-08-18 | 1984-10-09 | Sumitomo Metal Industries, Ltd. | Method for producing clean cold strip |
| JPH0428823A (en) * | 1990-05-25 | 1992-01-31 | Sumitomo Metal Ind Ltd | Method for annealing high carbon steel strip |
| JPH06108164A (en) * | 1992-09-25 | 1994-04-19 | Sumitomo Metal Ind Ltd | Method for cooling annealed coil |
| CN102016420A (en) * | 2008-07-07 | 2011-04-13 | 钢铁普蓝特克股份有限公司 | Radiant tube burner device and heat storing element unit capable of being mounted to radiant tube burner |
-
2012
- 2012-01-30 CN CN201210020782.6A patent/CN102534181B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4475369A (en) * | 1982-08-18 | 1984-10-09 | Sumitomo Metal Industries, Ltd. | Method for producing clean cold strip |
| JPH0428823A (en) * | 1990-05-25 | 1992-01-31 | Sumitomo Metal Ind Ltd | Method for annealing high carbon steel strip |
| JPH06108164A (en) * | 1992-09-25 | 1994-04-19 | Sumitomo Metal Ind Ltd | Method for cooling annealed coil |
| CN102016420A (en) * | 2008-07-07 | 2011-04-13 | 钢铁普蓝特克股份有限公司 | Radiant tube burner device and heat storing element unit capable of being mounted to radiant tube burner |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105018715A (en) * | 2015-08-24 | 2015-11-04 | 武汉富瑞能源科技有限公司 | Horizontal type bell furnace |
| CN105018715B (en) * | 2015-08-24 | 2017-03-08 | 武汉富瑞能源科技有限公司 | Horizontal bell furnace |
| CN106011452A (en) * | 2016-07-09 | 2016-10-12 | 新万鑫（福建）精密薄板有限公司 | In-furnace air pressure control device and method of oriented silicon steel high-temperature bell type furnace |
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| CN102534181B (en) | 2014-01-29 |
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Address after: 214400, Jiangsu Huishan Wuxi Economic Development Zone Qian Qiao supporting area (Creek Village) Applicant after: WUXI HUAJING NEW MATERIAL Co.,Ltd. Address before: 214400, Jiangsu Huishan Wuxi Economic Development Zone Qian Qiao supporting area (Creek Village) Applicant before: Wuxi Huajin New Material Co.,Ltd. |
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Denomination of invention: A Gas Distribution System for High Temperature Annealing of Oriented Silicon Steel Strip in a Bell Furnace Effective date of registration: 20230315 Granted publication date: 20140129 Pledgee: Agricultural Bank of China Limited by Share Ltd. Wuxi Huishan branch Pledgor: WUXI HUAJING NEW MATERIAL Co.,Ltd. Registration number: Y2023980034890 |
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