CN103014308A - Galvanized vertical annealing furnace - Google Patents
Galvanized vertical annealing furnace Download PDFInfo
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- CN103014308A CN103014308A CN2012105141613A CN201210514161A CN103014308A CN 103014308 A CN103014308 A CN 103014308A CN 2012105141613 A CN2012105141613 A CN 2012105141613A CN 201210514161 A CN201210514161 A CN 201210514161A CN 103014308 A CN103014308 A CN 103014308A
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Abstract
The invention provides a galvanized vertical annealing furnace which comprises a furnace body. The furnace body is internally provided with a preheating section and a radiant tube heating section. The furnace body is further internally provided with a straight combustion section between the preheating section and the radiant tube heating section. Strip steel moving upward on the preheating section moves through at least one turning roll arranged at the top of the preheating section backward and downward and enters into the straight combustion section. Smoke generated by the straight combustion section enters into the preheated strip steel in the preheating section. The straight combustion section is internally provided with pairs of flat flame nozzles and pairs of nitrogen nozzles arranged along the direction of the strip steel. Each pair of flat flame nozzles and each pair of nitrogen nozzles are symmetrically distributed on both sides of the strip steel. Each pair of nitrogen nozzles is arranged between two pairs of flat flame nozzles. According to the annealing furnace provided by the invention, external oxidation behavior of alloying element in the strip steel is limited in the preheating section of the annealing furnace, so that internal oxidation behavior is accelerated, and the problem that the adhesiveness of a zinc layer decreases is solved. A galvanized sheet which is better in surface quality is easier to produce, so that the probability of qualified products obtained by production is improved, and the rejection rate is reduced.
Description
Technical field
The invention belongs to metallurgical technology field, relate in particular to a kind of zinc-plated vertical annealing furnace.
Background technology
Along with the increase of market to the hot-dip galvanized high-strength steel demand, the competition that puts goods on the market of numerous high-strength steel galvanization production lines.But some Continuous Hot Dip Galvanizing Line have but run into trouble in production and triturating, coating adhesion occurs and descend, even dezincify etc. problem occurs.Its reason major part is because belt steel surface generation selective oxidation.Band steel selective oxidation not only causes coating adhesion decline problem, also causes easily simultaneously the generation of furnace roller response type dross.
Common high-strength steel comprises low alloy steel HSS, dual phase steel DP, phase change induction plasticity steel TRIP, twin crystal inducing plasticity steel TWIP etc. at present.Usually element is added in the conducts such as silicon Si, the manganese Mn of selection different content, aluminium AI, chromium Cr, phosphorus P in the chemical ingredients of these steel, with the characteristic that need to obtain.Even early stage people study find under the recrystallization annealing shielding gas condition, different dew point, different oxygen partial pressure (perhaps hydrogen content), some alloying element also can be in the belt steel surface segregation; Find that simultaneously in annealing atmosphere, oxidation does not occur iron, and alloying element silicon, manganese, aluminium etc. are oxidized easily, this oxidising process aggravated alloying element with oxide form in the surface of steel plate segregation, this phenomenon is exactly selective oxidation.This external oxidation that occurs in surface of steel plate is to cause zinc-plated coating adhesion to descend, even the arch-criminal of point-like dezincify occurs.If obtain qualified hot galvanizing surface coating, must avoid the generation of external oxidation behavior.
Solve at present band steel selective oxidation problem two kinds of solutions are arranged.A kind of is to adjust production technique by setting up mathematical model, avoids being with steel to produce external oxidation and reaches the coating adhesion decline problem that solves; Another kind is by existing installation being transformed or design and construction new type of continuous annealing furnace solves this problem.
Summary of the invention
The technical problem to be solved in the present invention is: a kind of zinc-plated vertical annealing furnace that can overcome the belt steel surface selective oxidation is provided.
The present invention solves the problems of the technologies described above the technical scheme of taking to be:
Zinc-plated vertical annealing furnace, it comprises body of heater, be provided with preheating section and radiator tube heating zone in the described body of heater, it is characterized in that, also be provided with the direct combustion section between described preheating section and radiator tube heating zone in the described body of heater, after at least one deflector roll that arranges through described preheating section top after described preheating section moves upward with steel turn to under be moved into described direct combustion section, the flue gas that described direct combustion section produces enters described preheating section preheating zone steel, be provided with many to flat flame burner and many to the nitrogen nozzle along what arrange with the steel trend in the described direct combustion section, every pair of flat flame burner is symmetrically distributed in band steel both sides, every pair of nitrogen nozzle is symmetrically distributed in band steel both sides, and every pair of nitrogen nozzle is arranged between two pairs of flat flame burners.
In the such scheme, the injection direction of described flat flame burner and nitrogen nozzle is perpendicular to the band steel.
In the such scheme, each nitrogen nozzle and with the horizontal throw between the steel less than each flat flame burner and with the horizontal throw between the steel.
In the such scheme, also be provided with in the described body of heater be used to the disrupter that makes described direct combustion section and described radiator tube heating zone gas isolating, described disrupter comprises two baffle plates and is arranged on the first nitrogen ftercompction shower nozzle between described two baffle plates that described two baffle plates and the first nitrogen ftercompction shower nozzle are arranged on the top with steel.
In the such scheme, described disrupter also comprises two atmosphere barricades and the second nitrogen ftercompction shower nozzle, described the second nitrogen ftercompction shower nozzle is arranged between described two atmosphere barricades, and described two atmosphere barricades and the second nitrogen ftercompction shower nozzle all are arranged on the below with steel.
In the such scheme, also be provided with the thermal baffle with described at least one deflector roll and high-temperature furnace gas interval, below in the described body of heater.
Principle of the present invention is: but utilize flat flame burner rapid heating band steel, the atmosphere behind the fuel gas buring mostly is weak oxide atmosphere, and the band steel is in the weak oxide environment at direct combustion Duan Gang, dew point is very high, this just causes the inside diffusion flux of oxygen large, the state of having the advantage, oxidation in just occuring.In the rapid heating process, do not leave any chance to external oxidation simultaneously, the band steel forms the thin layer (iron under this environment selective oxidation occurs) that a small amount of ferric oxide is only arranged at belt steel surface when entering radiator tube heating zone section.Anterior dew point in the radiator tube heating zone relatively higher (usually at 0 ℃ to-5 ℃) impels interior oxidation to further develop, and makes alloying element finish all interior oxidation, prevents that alloying element is at the belt steel surface external oxidation.Enter in the radiator tube heating zone, back segment zone, with the oxide compound of steel top layer iron by hydrogen reducing, the plated surface that can obtain.
Compared with prior art, the beneficial effect that the present invention obtains is: utilize annealing furnace of the present invention to make with steel and be limited generation with the behavior of steel interalloy element external oxidation, the carrying out of impelling interior oxidation behavior in the annealing furnace preheating section.And just limited the formation of belt steel surface sheet external oxidation at Initial Annealing, prevented that alloying element is at the belt steel surface external oxidation, reduced to cause the factor of coating adhesion decline problem, make the galvanized sheet of the better surface quality of easier production, make and produce the probability raising that obtains qualified product, reduce the waste wood rate.
Description of drawings
The structural representation of the zinc-plated vertical annealing furnace that Fig. 1 provides for the embodiment of the invention.
Embodiment
The invention will be further described below in conjunction with drawings and Examples, and certain following embodiment should not be construed as limitation of the present invention.
As shown in Figure 1, the embodiment of the invention provides a kind of zinc-plated vertical annealing furnace, and it comprises body of heater 1, is provided with preheating section 2, direct combustion section 3 in this body of heater 1, reaches radiator tube heating zone 4.
Also be provided with in the body of heater 1 be used to the disrupter that makes direct combustion section 3 with radiator tube heating zone 4 gas isolatings, this disrupter comprises two baffle plates 8, be arranged on the first nitrogen ftercompction shower nozzle 9 between two baffle plates 8, two atmosphere barricades 10, and the second nitrogen ftercompction shower nozzle 11.The top that two baffle plates 8 and the first nitrogen ftercompction shower nozzle 9 are arranged on steel, the below that two atmosphere barricades 10 and the second nitrogen ftercompction shower nozzle 11 are arranged on steel.Two baffle plates 8 and 9 actings in conjunction of the first nitrogen ftercompction shower nozzle form the isolation of preheating section 2 and direct combustion section 3 and radiator tube heating zone 4, and prior effect is as preventing that the furnace pressure fluctuation from causing combustion exhaust to flow backward to radiator tube heating zone 4.Two baffle plates 8 can swing, and purpose is by swinging vacating space that the band steel is penetrated.11 actings in conjunction can reduce to separate with it contacting of the interior atmosphere of forehearth section of radiator tube heating zone 4 to two atmosphere barricades 10 to greatest extent with the second nitrogen ftercompction shower nozzle, cooperate two baffle plates 8 and the first nitrogen ftercompction shower nozzle 9, play the with it isolation of the interior weak oxide atmosphere of forehearth section of radiator tube heating zone 4 reducing atmospheres.
Need to prove that those of ordinary skill in the art should be appreciated that and can make amendment or be equal to replacement technical scheme of the present invention, and do not break away from aim and the scope of technical solution of the present invention, it all should be encompassed in the middle of the claim scope of the present invention.
Claims (6)
1. zinc-plated vertical annealing furnace, it comprises body of heater, be provided with preheating section and radiator tube heating zone in the described body of heater, it is characterized in that, also be provided with the direct combustion section between described preheating section and radiator tube heating zone in the described body of heater, after at least one deflector roll that arranges through described preheating section top after described preheating section moves upward with steel turn to under be moved into described direct combustion section, the flue gas that described direct combustion section produces enters described preheating section preheating zone steel, be provided with many to flat flame burner and many to the nitrogen nozzle along what arrange with the steel trend in the described direct combustion section, every pair of flat flame burner is symmetrically distributed in band steel both sides, every pair of nitrogen nozzle is symmetrically distributed in band steel both sides, and every pair of nitrogen nozzle is arranged between two pairs of flat flame burners.
2. zinc-plated vertical annealing furnace as claimed in claim 1 is characterized in that, the injection direction of described flat flame burner and nitrogen nozzle is perpendicular to the band steel.
3. zinc-plated vertical annealing furnace as claimed in claim 1 is characterized in that, each nitrogen nozzle and with the horizontal throw between the steel less than each flat flame burner and with the horizontal throw between the steel.
4. zinc-plated vertical annealing furnace as claimed in claim 1, it is characterized in that, also be provided with in the described body of heater be used to the disrupter that makes described direct combustion section and described radiator tube heating zone gas isolating, described disrupter comprises two baffle plates and is arranged on the first nitrogen ftercompction shower nozzle between described two baffle plates that described two baffle plates and the first nitrogen ftercompction shower nozzle are arranged on the top with steel.
5. zinc-plated vertical annealing furnace as claimed in claim 4, it is characterized in that, described disrupter also comprises two atmosphere barricades and the second nitrogen ftercompction shower nozzle, described the second nitrogen ftercompction shower nozzle is arranged between described two atmosphere barricades, and described two atmosphere barricades and the second nitrogen ftercompction shower nozzle all are arranged on the below with steel.
6. zinc-plated vertical annealing furnace as claimed in claim 1 is characterized in that, also is provided with the thermal baffle with described at least one deflector roll and high-temperature furnace gas interval, below in the described body of heater.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012105141613A CN103014308A (en) | 2012-12-05 | 2012-12-05 | Galvanized vertical annealing furnace |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012105141613A CN103014308A (en) | 2012-12-05 | 2012-12-05 | Galvanized vertical annealing furnace |
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| CN103014308A true CN103014308A (en) | 2013-04-03 |
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| CN2012105141613A Pending CN103014308A (en) | 2012-12-05 | 2012-12-05 | Galvanized vertical annealing furnace |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107354424A (en) * | 2017-08-08 | 2017-11-17 | 常州大学 | A kind of evaporation zinc pretreating process for suppressing high-strength steel surface of steel plate selective oxidation |
| CN114317942A (en) * | 2020-09-28 | 2022-04-12 | 上海梅山钢铁股份有限公司 | Method for judging and processing water leakage in hot galvanizing horizontal furnace |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1075169A (en) * | 1992-11-25 | 1993-08-11 | 武汉钢铁公司 | Continuous annealing furnace |
| CN101270409A (en) * | 2008-05-07 | 2008-09-24 | 唐山钢铁股份有限公司 | Anneal technique for producing SPCC steel grade with zincing wire annealing oven |
| CN201908124U (en) * | 2010-12-17 | 2011-07-27 | 鞍钢新轧-蒂森克虏伯镀锌钢板有限公司 | Galvanized wire pre-oxidation device |
| CN202989242U (en) * | 2012-12-05 | 2013-06-12 | 中冶南方(武汉)威仕工业炉有限公司 | Galvanized vertical annealing furnace |
-
2012
- 2012-12-05 CN CN2012105141613A patent/CN103014308A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1075169A (en) * | 1992-11-25 | 1993-08-11 | 武汉钢铁公司 | Continuous annealing furnace |
| CN101270409A (en) * | 2008-05-07 | 2008-09-24 | 唐山钢铁股份有限公司 | Anneal technique for producing SPCC steel grade with zincing wire annealing oven |
| CN201908124U (en) * | 2010-12-17 | 2011-07-27 | 鞍钢新轧-蒂森克虏伯镀锌钢板有限公司 | Galvanized wire pre-oxidation device |
| CN202989242U (en) * | 2012-12-05 | 2013-06-12 | 中冶南方(武汉)威仕工业炉有限公司 | Galvanized vertical annealing furnace |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107354424A (en) * | 2017-08-08 | 2017-11-17 | 常州大学 | A kind of evaporation zinc pretreating process for suppressing high-strength steel surface of steel plate selective oxidation |
| CN107354424B (en) * | 2017-08-08 | 2019-10-11 | 常州大学 | A kind of vapor deposition zinc pretreating process inhibiting high-strength steel surface of steel plate selective oxidation |
| CN114317942A (en) * | 2020-09-28 | 2022-04-12 | 上海梅山钢铁股份有限公司 | Method for judging and processing water leakage in hot galvanizing horizontal furnace |
| CN114317942B (en) * | 2020-09-28 | 2024-05-10 | 上海梅山钢铁股份有限公司 | Method for judging and treating water leakage in hot galvanizing horizontal furnace |
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Application publication date: 20130403 |