CN103555926B - Atmosphere replacement method of continuous annealing furnace - Google Patents
Atmosphere replacement method of continuous annealing furnace Download PDFInfo
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- CN103555926B CN103555926B CN201310550386.9A CN201310550386A CN103555926B CN 103555926 B CN103555926 B CN 103555926B CN 201310550386 A CN201310550386 A CN 201310550386A CN 103555926 B CN103555926 B CN 103555926B
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- 238000000137 annealing Methods 0.000 title claims abstract description 315
- 239000012298 atmosphere Substances 0.000 title claims abstract description 208
- 238000000034 method Methods 0.000 title claims abstract description 44
- 229910052719 titanium Inorganic materials 0.000 claims abstract description 121
- 239000010936 titanium Substances 0.000 claims abstract description 121
- 230000001681 protective effect Effects 0.000 claims abstract description 115
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims abstract description 112
- IJGRMHOSHXDMSA-UHFFFAOYSA-N nitrogen Substances N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 111
- 239000007789 gas Substances 0.000 claims abstract description 66
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 56
- 238000004519 manufacturing process Methods 0.000 claims abstract description 46
- 239000010935 stainless steel Substances 0.000 claims abstract description 36
- 229910001220 stainless steel Inorganic materials 0.000 claims abstract description 36
- 239000012300 argon atmosphere Substances 0.000 claims abstract description 8
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 92
- 229910000831 Steel Inorganic materials 0.000 claims description 67
- 239000010959 steel Substances 0.000 claims description 67
- 239000001257 hydrogen Substances 0.000 claims description 56
- 229910052739 hydrogen Inorganic materials 0.000 claims description 56
- 229910052786 argon Inorganic materials 0.000 claims description 46
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 31
- 238000006073 displacement reaction Methods 0.000 claims description 28
- 238000010438 heat treatment Methods 0.000 claims description 26
- 239000000203 mixture Substances 0.000 claims description 26
- 150000002431 hydrogen Chemical class 0.000 claims description 25
- 238000001816 cooling Methods 0.000 claims description 23
- 238000010926 purge Methods 0.000 claims description 21
- 230000007704 transition Effects 0.000 claims description 7
- 230000001105 regulatory effect Effects 0.000 claims description 2
- 239000002131 composite material Substances 0.000 description 8
- 239000000463 material Substances 0.000 description 6
- 230000000737 periodic effect Effects 0.000 description 6
- 229910001200 Ferrotitanium Inorganic materials 0.000 description 4
- 239000007921 spray Substances 0.000 description 4
- 238000010276 construction Methods 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
- MKYBYDHXWVHEJW-UHFFFAOYSA-N N-[1-oxo-1-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)propan-2-yl]-2-[[3-(trifluoromethoxy)phenyl]methylamino]pyrimidine-5-carboxamide Chemical compound O=C(C(C)NC(=O)C=1C=NC(=NC=1)NCC1=CC(=CC=C1)OC(F)(F)F)N1CC2=C(CC1)NN=N2 MKYBYDHXWVHEJW-UHFFFAOYSA-N 0.000 description 1
- 238000005275 alloying Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000003902 lesion Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000010583 slow cooling Methods 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
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Abstract
The invention relates to an atmosphere replacement method of a continuous annealing furnace, which is characterized by comprising the following steps: the protective atmosphere replacement is completed when the stainless steel strip annealing mode is converted into the titanium strip annealing mode in the continuous annealing furnace through a protective atmosphere replacement system arranged in a furnace body of the continuous annealing furnace, and the protective atmosphere in the furnace is quickly replaced into the required protective atmosphere in the furnace according to the process requirement, so that the adjustment of the protective atmosphere in the furnace is completed; the protective atmosphere replacement system is communicated with an external protective gas supply system; the protective atmosphere in the furnace can be flexibly replaced into hydrogen-nitrogen mixed gas or argon atmosphere according to production requirements, so that the requirements of stainless steel strip annealing and titanium strip annealing are met. The annealing of the titanium belt and the stainless steel belt on one continuous annealing line is realized, and the specially-built annealing furnace for annealing and producing the titanium belt is avoided.
Description
Technical field
The invention belongs to protective atmosphere method of replacing when titanium band and Stainless Steel Band are annealed in continuous annealing furnace, belong to the method that the protective atmosphere of continuous annealing furnace when changing the annealing of titanium band and annealing with Stainless Steel Band for titanium band and Stainless Steel Band annealing is replaced especially.
Background technology
In existing titanium plate production process, anneal mostly adopts vacuum coil annealing, vacuum coil annealing is periodic annealing, and the annealing cycle is long, because of in vacuum annealing process, titanium plate is outside, middle part and heart portion are heated inequality, makes sheet material Internal and external cycle microstructure and property homogeneity poor.At present a lot of technique is subject to thermal effect to promote titanium plate by strengthening atmosphere convection current under an argon atmosphere in annealing process, although improve the structure and properties homogeneity of vacuum annealing titanium plate to a certain extent, but fail fundamentally to solve the problem of titanium plate annealing ununiformity, annealing sheet material also exists the problem such as performance difference and surface quality defect at different positions.The invention that application number is 201110003672.4 provides a kind of continuous bright annealing furnace to involve in the technique of row continuous bright annealing process to Cold-rolled Pure titanium, Ti Alloy Strip, according to the thick difference of volume, with the speed of 2 ~ 6m/min successively process, cleaning, dry up, finally introduce continuous bright annealing furnace; Inert protective gas argon gas is filled in annealing furnace.Continuous annealing solves the unequal problem of being heated that periodic annealing easily causes, but because titanium plate rolling reductions performance is special, titanium plate & strip production line construction difficulty is large, titanium plate is expensive and consumption is little, the strip producing line of special construction titanium plate is not only invested huge, and product line throughput can be to a certain degree superfluous.Mostly utilize steel sheet production line to carry out the rolling of titanium plate at present, follow-uply take vacuum coil annealing or continuous annealing mode.
Application number be 201220023604.4 utility model provide a kind of stainless steel and titanium steel continuous annealing furnace spray device for cooling, this device relates to a kind of spray device for cooling, is specifically related to a kind of stainless steel and titanium steel continuous annealing furnace spray device for cooling.In order to the one-piece construction solving existing annealing furnace spray device for cooling is unfavorable for the quick cooling after stainless steel heating and the quick cooling process behind titanium steel slow cooling section, and the problem that installation and maintenance are very inconvenient.The stainless steel that this utility model is studied and titanium steel continuous annealing furnace, being carry out continuous annealing to stainless steel with containing the steel of the alloying element titanium added, is not the continuous annealing furnace that can carry out continuous annealing to stainless steel and titanium plate.
The continuous annealing of titanium plate adopts argon gas atmosphere protection; stainless steel plate adopts the annealing of perhydro atmosphere protection; after existing steel sheet production line is rolled titanium plate, steel sheet production line continuous annealing furnace cannot carry out continuous annealing to titanium plate; if the newly-built continuous annealing line that can be used for the annealing of titanium plate specially; then invest huge; and because titanium plate demand is little, continuous annealing line throughput is easily superfluous also therefore cause the interim stopping production problem of continuous annealing furnace; less economical, and production scheduling etc. may be affected because of stove district location problem.
Uneven and there is the problems such as surface quality defect for overcoming titanium plate microstructure and property in vacuum coil annealing, huge and the overcapacity problem of the investment simultaneously avoiding newly-built titanium band continuous annealing furnace to cause, therefore propose a kind of continuous annealing furnace being applicable to titanium band and Stainless Steel Band annealing, can be used for the continuous annealing of titanium plate and stainless steel plate.When titanium band and Stainless Steel Band carry out annealing variety exchanging in continuous annealing, need to change protective atmosphere in continuous annealing furnace.
Summary of the invention
Problem to be solved by this invention is: provide a kind of and be applicable to atmosphere method of replacing that is vertical or Horizontal Continuous Furnace; under the prerequisite ensureing continuous annealing furnace use safety and titanium band, Stainless Steel Band annealing quality, the protective atmosphere of continuous annealing furnace when changing the annealing of titanium band or Stainless Steel Band annealing for titanium band and Stainless Steel Band annealing is replaced.
For solving the problems of the technologies described above, the technical solution used in the present invention is:
A kind of atmosphere method of replacing of continuous annealing furnace, it is characterized in that: the protective atmosphere exchange system be equipped with by continuous annealing furnace body, in continuous annealing furnace, when titanium band anneal mode is changed mutually, complete protective atmosphere by Stainless Steel Band anneal mode replace, need to be protective atmosphere in required stove by the protective atmosphere Rapid replacement in stove according to technique, thus complete the adjustment of protective atmosphere in stove; Described protective atmosphere exchange system is connected with outer protection gas airing system; Mainly comprise the steps:
A: arranging continuous annealing furnace operational mode is creep mode, furnace annealing product is stainless-steel roll or titanium volume;
B: pass into nitrogen purging annealing furnace to replace furnace atmosphere after reducing furnace temperature;
C: according to annealing product protective atmosphere needs, pass into the protective atmosphere of needs, furnace atmosphere is replaced;
D: after furnace atmosphere is replaced, heat up, and change annealing product, adjustment annealing furnace is normal operation mode, anneals in continuous annealing furnace;
Described continuous annealing furnace change after annealing product be Stainless Steel Band anneal time, for preventing Stainless Steel Band heat-tinting, stove interior employing hydrogen nitrogen mixture is protective atmosphere, and hydrogen volume is than 75% ~ 100%; When annealing to titanium band, hydrogen nitrogen mixture in continuous annealing furnace need be purged clean, ensure that argon gas atmosphere is protective atmosphere, purity of argon is greater than 99%.
By technique scheme, described atmosphere method of replacing specifically comprises the steps:
When steel band produced by continuous annealing furnace, in stove, hydrogen nitrogen mixture is adopted to be protective atmosphere; When this continuous annealing furnace needs for the production of titanium band, arranging continuous annealing furnace operational mode is creep mode, reduces continuous annealing furnace furnace temperature; When annealing furnace each district furnace temperature is down to 800 DEG C, protective atmosphere exchange system is utilized to carry out nitrogen purging, progressively the hydrogen nitrogen mixture protective atmosphere in stove is replaced into nitrogen, the high-purity argon gas purging of volume fraction 99.99% is carried out again with protective atmosphere exchange system, progressively protective atmosphere in stove is replaced into required argon gas, thus meets the continuous annealing protective atmosphere needs of titanium band; When after furnace atmosphere displacement completely, after namely argon content reaches 99%, heat up in continuous annealing furnace, and connect steel band and titanium band by processing apparatus before continuous annealing furnace entrance, annealing product is replaced by titanium band; Adjustment annealing furnace is normal operation mode, carries out the annealing of titanium band in continuous annealing furnace;
When titanium band produced by continuous annealing furnace, in stove, argon gas is adopted to be protective atmosphere; When production line changes production steel band into and this continuous annealing furnace needs for the production of steel band, arranging continuous annealing furnace operational mode is creep mode, reduces continuous annealing furnace furnace temperature; Utilize protective atmosphere exchange system to carry out nitrogen purging, progressively the argon atmosphere in stove is replaced into nitrogen; Utilize protective atmosphere exchange system to pass into hydrogen when annealing furnace each district furnace temperature rises to 800 DEG C, progressively protective atmosphere in stove is replaced into required hydrogen nitrogen mixture, thus meet the continuous annealing protective atmosphere needs of steel band; After furnace atmosphere displacement completely, namely hydrogen volume than 75% ~ 100% after, heat up in continuous annealing furnace, and by processing apparatus connection titanium band and steel band before continuous annealing furnace entrance, annealing product be replaced by steel band; Adjustment annealing furnace is normal operation mode, carries out the annealing of steel band in continuous annealing furnace.
By technique scheme, protective atmosphere exchange system divides two subsystems, is respectively main airing system and time airing system; Main airing system atmosphere displacement the stage in stove, pass into protective atmosphere fast, secondary airing system in production phase regulating stove internal pressure to ensure furnace pressure state.
By technique scheme, protective atmosphere exchange system is configured in heating zone or the cooling section of continuous annealing furnace, or is configured in the transition section between heating zone and cooling section; The protective atmosphere recycle system is configured in heating zone or the cooling section of continuous annealing furnace, or is configured in the transition section between heating zone and cooling section.
By technique scheme, heating zone is retort furnace; When heating zone is retort furnace, described protective atmosphere exchange system and the protective atmosphere recycle system are not all arranged on heating zone.
Relative to prior art; beneficial effect of the present invention is: the atmosphere method of replacing providing a kind of continuous annealing furnace; can replace protective atmosphere in stove flexibly according to need of production is hydrogen nitrogen mixture or argon gas atmosphere, thus meets the annealing of Stainless Steel Band annealing and titanium band.Realize annealing to titanium band and Stainless Steel Band on a continuous annealing line, avoid the annealing for carrying out titanium band and produce special newly-built annealing furnace, it also avoid special newly-built titanium band annealing furnace and the problems such as the interim stopping production of equipment that causes because of demand deficiency, improve the utilising efficiency of production line and annealing furnace, improve economical efficiency and workshop service efficiency greatly; And the efficiency of production Stainless Steel Band-titanium band composition board can be promoted.
Accompanying drawing explanation
Fig. 1 is the structural representation of the present invention's the 1st embodiment.
Fig. 2 is the structural representation of the present invention's the 2nd embodiment.
In Fig. 1-2, each Reference numeral is corresponding as follows: inlet seal 1, heating zone 2, transition section 3, gas ventilator 4, the protective atmosphere recycle system 5, steering gear 6, passage 7, exit seal 8, cooling section 9.
Fig. 3 is the structural representation of the present invention's the 3rd embodiment.
Fig. 4 is the structural representation of the present invention's the 4th embodiment.
In Fig. 3-4, each Reference numeral is corresponding as follows: inlet seal 1, preheating section 2, heating zone 3, cooling section 4, exit seal 5, gas ventilator 6, gas-circulating system 7, air cushion airing system 8.
Embodiment
In order to understand the present invention better, illustrate content of the present invention further below in conjunction with embodiment, but content of the present invention is not only confined to the following examples.
Embodiment 1:
The vertical continuous annealing furnace that in the present embodiment, atmosphere exchange system is suitable for, comprises inlet seal 1, heating zone 2; transition section 3, cooling section 9, steering gear 6 and passage 7; exit seal 8, the protective atmosphere recycle system 5 being arranged in the gas ventilator 4 on cooling section 9 and being arranged in heating zone 2.
When vertical continuous annealing furnace produces steel band, in stove, hydrogen nitrogen (hydrogen volume is than 99.99%) gas mixture is adopted to be protective atmosphere, when needs change production titanium band into, arranging continuous annealing furnace operational mode is creep mode, reduce continuous annealing furnace furnace temperature, when annealing furnace each district furnace temperature is down to 800 DEG C, utilize gas ventilator 4 to carry out nitrogen purging and progressively the hydrogen nitrogen mixture protective atmosphere in stove is replaced into nitrogen, again by high-purity (volume fraction 99.99%) argon purge, progressively nitrogen protection atmosphere in stove is replaced into required argon gas, furnace atmosphere circulation is strengthened by the protective atmosphere recycle system 5 in replacement process, the main airing system of the gas ventilator 4 be equipped with by continuous annealing furnace passes into argon atmosphere fast in stove, complete the displacement to furnace atmosphere, thus meet the continuous annealing protective atmosphere needs of titanium band.After furnace atmosphere displacement complete (argon content reaches 99%), heat up, and connect steel band and titanium band by processing apparatus before continuous annealing furnace entrance, annealing product is replaced by titanium band, adjustment annealing furnace is normal operation mode, carries out the annealing of titanium band in continuous annealing furnace;
When vertical continuous annealing furnace produces titanium band, in stove, argon gas is adopted to be protective atmosphere; When needs production line changes production steel band into, arranging continuous annealing furnace operational mode is creep mode, reduces continuous annealing furnace furnace temperature, utilizes nitrogen purging progressively the argon atmosphere in stove to be replaced into nitrogen; Hydrogen is passed into when annealing furnace each district furnace temperature rises to 800 DEG C; progressively nitrogen protection atmosphere in stove is replaced into required hydrogen nitrogen (hydrogen volume is than 99.99%) gas mixture; furnace atmosphere circulation is strengthened by the protective atmosphere recycle system 5 in replacement process; the main airing system of the gas ventilator 4 be equipped with by continuous annealing furnace passes into protective atmosphere fast in stove; complete the displacement to furnace atmosphere, thus meet the continuous annealing protective atmosphere needs of steel band.After furnace atmosphere displacement complete (hydrogen volume is than 99.99%), heat up, and connect titanium band and steel band by processing apparatus before continuous annealing furnace entrance, annealing product is replaced by steel band, adjustment annealing furnace is normal operation mode, carries out the annealing of steel band in continuous annealing furnace.
Preferably, gas ventilator 4 of the present invention is preferably air exchange system.
According to above-mentioned technique, replacing protective atmosphere in stove flexibly according to need of production is hydrogen nitrogen mixture or argon gas atmosphere, reaches the object of the annealing meeting strip anneal and titanium band; And after continuous annealing can being carried out to titanium band and steel band respectively, produce titanium-steel-titanium composite panel.Realize the function on a continuous annealing line, titanium band and steel band being rolled and being annealed, need not for carrying out the annealing of titanium band and producing special newly-built annealing furnace.And the quality problems such as sheet material Internal and external cycle microstructure and property homogeneity is poor when there will not be periodic to anneal after the annealing of titanium band; Improve production line, the utilising efficiency in annealing furnace and workshop and economical efficiency; And the efficiency of production titanium-steel-titanium composite panel can be promoted.
Embodiment 2:
The vertical continuous annealing furnace that the present embodiment atmosphere exchange system is suitable for; comprise inlet seal 1; heating zone 2; transition section 3, cooling section 9, steering gear and passage 7; exit seal 8; heating zone is retort furnace, has muffle tube 10 in heating zone, is arranged in the gas ventilator 4 on cooling section 9 and the protective atmosphere recycle system 5.
When vertical continuous annealing furnace produces steel band, in stove, hydrogen nitrogen (hydrogen volume is than 80%) gas mixture is adopted to be protective atmosphere, when needs change production titanium band into, arranging continuous annealing furnace operational mode is creep mode, reduce continuous annealing furnace furnace temperature, when annealing furnace each district furnace temperature is down to 800 DEG C, nitrogen purging is utilized progressively the hydrogen nitrogen mixture protective atmosphere in stove to be replaced into nitrogen, again by high-purity (volume fraction 99.99%) argon purge, progressively protective atmosphere in stove is replaced into required argon gas, furnace atmosphere circulation is strengthened by the protective atmosphere recycle system in replacement process, the main airing system of the protective atmosphere exchange system be equipped with by continuous annealing furnace passes into protective atmosphere fast in stove, complete the displacement to furnace atmosphere, thus meet the continuous annealing protective atmosphere needs of titanium band.After furnace atmosphere displacement complete (argon content reaches 99%), heat up, and connect steel band and titanium band by processing apparatus before continuous annealing furnace entrance, annealing product is replaced by titanium band, adjustment annealing furnace is normal operation mode, carries out the annealing of titanium band in continuous annealing furnace;
When vertical continuous annealing furnace produces titanium band, in stove, argon gas is adopted to be protective atmosphere, when needs production line changes production steel band into, arranging continuous annealing furnace operational mode is creep mode, reduce continuous annealing furnace furnace temperature, nitrogen purging is utilized progressively the argon atmosphere in stove to be replaced into nitrogen, hydrogen is passed into when annealing furnace each district furnace temperature rises to 800 DEG C, progressively protective atmosphere in stove is replaced into required hydrogen nitrogen (hydrogen volume is than 80%) gas mixture, furnace atmosphere circulation is strengthened by the protective atmosphere recycle system in replacement process, the main airing system of the protective atmosphere exchange system be equipped with by continuous annealing furnace passes into protective atmosphere fast in stove, complete the displacement to furnace atmosphere, thus meet the continuous annealing protective atmosphere needs of steel band.After furnace atmosphere displacement complete (hydrogen volume is than 80%), heat up, and connect titanium band and steel band by processing apparatus before continuous annealing furnace entrance, annealing product is replaced by steel band, adjustment annealing furnace is normal operation mode, carries out the annealing of steel band in continuous annealing furnace.
According to above-mentioned technique, replacing protective atmosphere in stove flexibly according to need of production is hydrogen nitrogen mixture or argon gas atmosphere, reaches the object of the annealing meeting strip anneal and titanium band; And after continuous annealing can being carried out to titanium band and steel band respectively, produce titanium-steel-titanium composite panel.Realize the function on a vertical continuous annealing line, titanium band and steel band being rolled and being annealed, need not for carrying out the annealing of titanium band and producing special newly-built annealing furnace.And the quality problems such as sheet material Internal and external cycle microstructure and property homogeneity is poor when there will not be periodic to anneal after the annealing of titanium band; Improve production line, the utilising efficiency in annealing furnace and workshop and economical efficiency; And the efficiency of production titanium-steel-titanium composite panel can be promoted.
The concrete grammar that the atmosphere exchange system of above-mentioned two embodiments carries out atmosphere displacement is as follows: furnace annealing product is stainless-steel roll, protective atmosphere is perhydro atmosphere, arranging continuous annealing furnace operational mode is creep mode, after reducing continuous annealing furnace furnace temperature, pass into nitrogen purging annealing furnace to replace furnace atmosphere; Pass into argon gas atmosphere again, furnace atmosphere is replaced again; Furnace atmosphere displacement, completely after (argon content reaches 99%), heats up, and to change annealing product be titanium band, and adjustment annealing furnace is normal operation mode, carries out the annealing of titanium band in continuous annealing furnace;
Furnace annealing product is titanium volume, and protective atmosphere is argon gas atmosphere, and arranging continuous annealing furnace operational mode is creep mode, after reducing continuous annealing furnace furnace temperature, passes into nitrogen purging annealing furnace to replace furnace atmosphere; Pass into hydrogen atmosphere again, furnace atmosphere is replaced again; After furnace atmosphere hydrogen content reaches 90%, heat up, and to change annealing product be Stainless Steel Band, adjustment annealing furnace is normal operation mode, carries out the annealing of Stainless Steel Band in continuous annealing furnace.
Embodiment 3:
The Horizontal Continuous Furnace that the present embodiment atmosphere exchange system is suitable for, comprises inlet seal 1, preheating section 2, heating zone 3, cooling section 4, exit seal 5, is arranged in the gas ventilator 6 in heating zone, gas-circulating system 7 and air cushion airing system 8.Be equipped with air cushion airing system 8 in described Horizontal Continuous Furnace stove, the nozzle of air cushion airing system is staggered layout up and down, ensures that annealing band hoverheight is suitable for, stable; And the nozzle wind velocity of air cushion airing system is adjustable, according to thickness, the tension condition adjustment wind speed of annealing band, guarantee the buoyancy to annealing band and heat; Described air cushion airing system is connected with outside inert protective gas airing system, when Horizontal Continuous Furnace produces titanium band or steel band, selects corresponding Annealing Protection atmosphere (argon gas or hydrogen) to carry out air feed respectively.Air cushion airing system 8 mainly plays and forms the effect of air cushion from bottom picking-up band steel with blowing gas in horizontal chamber oven, thus avoids the surface with carrying roller lesion ribbon steel.
In the adjustment that described gas-circulating system 7 is set to protective atmosphere in stove and replacement process, strengthen furnace atmosphere circulation by carrying out flow-disturbing in annealing furnace different zones to furnace atmosphere.
When Horizontal Continuous Furnace produces steel band, in stove, hydrogen nitrogen (hydrogen volume is than 99.99%) gas mixture is adopted to be protective atmosphere, when needs change production titanium band into, arranging continuous annealing furnace operational mode is creep mode, reduce continuous annealing furnace furnace temperature, when annealing furnace each district furnace temperature is down to 800 DEG C, the main airing system of the gas ventilator 6 be equipped with by continuous annealing furnace passes into nitrogen fast in stove, air cushion airing system 8 also makes steel band keep overhang by nitrogen-blow simultaneously, progressively complete the displacement to furnace atmosphere, again by high-purity (volume fraction 99.99%) argon purge, the main airing system of the gas ventilator 6 be equipped with by continuous annealing furnace passes into argon gas fast in stove, air cushion airing system 8 also makes steel band keep overhang by winding-up argon gas simultaneously, progressively protective atmosphere in stove is replaced into required argon gas, furnace atmosphere circulation is strengthened by gas-circulating system 7 in replacement process, complete the displacement to furnace atmosphere, thus meet the continuous annealing protective atmosphere needs of titanium band.After furnace atmosphere displacement complete (argon content reaches 99%), heat up, and connect steel band and titanium band by processing apparatus before continuous annealing furnace entrance, annealing product is replaced by titanium band, adjustment annealing furnace is normal operation mode, carries out the annealing of titanium band in continuous annealing furnace;
When Horizontal Continuous Furnace produces titanium band, in stove, argon gas is adopted to be protective atmosphere, when needs production line changes production steel band into, arranging continuous annealing furnace operational mode is creep mode, reduce continuous annealing furnace furnace temperature, the main airing system of the gas ventilator 6 be equipped with by continuous annealing furnace passes into nitrogen fast in stove, air cushion airing system 8 also makes steel band keep overhang by nitrogen-blow simultaneously, progressively complete the displacement to furnace atmosphere, hydrogen is passed into when annealing furnace each district furnace temperature rises to 800 DEG C, the main airing system of the gas ventilator 6 be equipped with by continuous annealing furnace passes into hydrogen fast in stove, air cushion airing system 8 also makes steel band keep overhang by winding-up hydrogen simultaneously, progressively protective atmosphere in stove is replaced into required hydrogen nitrogen (hydrogen volume is than 99.99%) gas mixture, furnace atmosphere circulation is strengthened by gas-circulating system 7 in replacement process, the main airing system of the gas ventilator be equipped with by continuous annealing furnace passes into protective atmosphere fast in stove, complete the displacement to furnace atmosphere, thus meet the continuous annealing protective atmosphere needs of steel band.After furnace atmosphere displacement complete (hydrogen volume is than 99.99%), heat up, and connect titanium band and steel band by processing apparatus before continuous annealing furnace entrance, annealing product is replaced by steel band, adjustment annealing furnace is normal operation mode, carries out the annealing of steel band in continuous annealing furnace.
According to above-mentioned technique, thus realize that to replace protective atmosphere in stove flexibly according to need of production be hydrogen nitrogen mixture or argon gas atmosphere, reach the object of the annealing meeting strip anneal and titanium band; And after continuous annealing can being carried out to titanium band and steel band respectively, produce titanium-steel-titanium composite panel.Realize the function on a continuous annealing line, titanium band and steel band being rolled and being annealed, need not for carrying out the annealing of titanium band and producing special newly-built annealing furnace.And the quality problems such as sheet material Internal and external cycle microstructure and property homogeneity is poor when there will not be periodic to anneal after the annealing of titanium band; Improve production line, the utilising efficiency in annealing furnace and workshop and economical efficiency; And the efficiency of production titanium-steel-titanium composite panel can be promoted.
Embodiment 4:
The Horizontal Continuous Furnace that the present embodiment atmosphere exchange system is suitable for, comprises inlet seal 1, preheating section 2, heating zone 3, cooling section 4, exit seal 5, the gas-circulating system 7 being arranged in the gas ventilator 6 on cooling section and being arranged in heating zone.
When Horizontal Continuous Furnace produces steel band, in stove, hydrogen nitrogen (hydrogen volume is than 80%) gas mixture is adopted to be protective atmosphere, when needs change production titanium band into, arranging continuous annealing furnace operational mode is creep mode, reduce continuous annealing furnace furnace temperature, when annealing furnace each district furnace temperature is down to 800 DEG C, the main airing system of the gas ventilator 6 be equipped with by continuous annealing furnace passes into nitrogen fast in stove, air cushion airing system 8 also makes steel band keep overhang by nitrogen-blow simultaneously, progressively complete the displacement to furnace atmosphere, again by high-purity (volume fraction 99.99%) argon purge, the main airing system of the gas ventilator 6 be equipped with by continuous annealing furnace passes into argon gas fast in stove, air cushion airing system 8 also makes steel band keep overhang by winding-up argon gas simultaneously, progressively protective atmosphere in stove is replaced into required argon gas, furnace atmosphere circulation is strengthened by gas-circulating system 7 in replacement process, complete the displacement to furnace atmosphere, thus meet the continuous annealing protective atmosphere needs of titanium band.After furnace atmosphere displacement complete (argon content reaches 99%), heat up, and connect steel band and titanium band by processing apparatus before continuous annealing furnace entrance, annealing product is replaced by titanium band, adjustment annealing furnace is normal operation mode, carries out the annealing of titanium band in continuous annealing furnace;
When Horizontal Continuous Furnace produces titanium band, in stove, argon gas is adopted to be protective atmosphere, when needs production line changes production steel band into, arranging continuous annealing furnace operational mode is creep mode, reduce continuous annealing furnace furnace temperature, the main airing system of the gas ventilator 6 be equipped with by continuous annealing furnace passes into nitrogen fast in stove, air cushion airing system 8 also makes steel band keep overhang by nitrogen-blow simultaneously, nitrogen purging is utilized progressively the argon atmosphere in stove to be replaced into nitrogen, hydrogen is passed into when annealing furnace each district furnace temperature rises to 800 DEG C, the main airing system of the gas ventilator 6 be equipped with by continuous annealing furnace passes into hydrogen fast in stove, air cushion airing system 8 also makes steel band keep overhang by winding-up hydrogen simultaneously, progressively protective atmosphere in stove is replaced into required hydrogen nitrogen (hydrogen volume is than 80%) gas mixture, furnace atmosphere circulation is strengthened by gas-circulating system 7 in replacement process, complete the displacement to furnace atmosphere, thus meet the continuous annealing protective atmosphere needs of steel band.After furnace atmosphere displacement complete (hydrogen volume is than 80%), heat up, and connect titanium band and steel band by processing apparatus before continuous annealing furnace entrance, annealing product is replaced by steel band, adjustment annealing furnace is normal operation mode, carries out the annealing of steel band in continuous annealing furnace.
Thus realize that to replace protective atmosphere in stove flexibly according to need of production be hydrogen nitrogen mixture or argon gas atmosphere, reach the object of the annealing meeting strip anneal and titanium band; And after continuous annealing can being carried out to titanium band and steel band respectively, produce titanium-steel-titanium composite panel.Realize the function on a continuous annealing line, titanium band and steel band being rolled and being annealed, need not for carrying out the annealing of titanium band and producing special newly-built annealing furnace.And the quality problems such as sheet material Internal and external cycle microstructure and property homogeneity is poor when there will not be periodic to anneal after the annealing of titanium band; Improve production line, the utilising efficiency in annealing furnace and workshop and economical efficiency; And the efficiency of production titanium-steel-titanium composite panel can be promoted.
The embodiment that the system of Application Example 1-4 carries out atmosphere method of replacing is as follows:
Embodiment 5:
An atmosphere method of replacing for continuous annealing furnace, furnace annealing product is stainless-steel roll, and protective atmosphere is perhydro atmosphere, and arranging continuous annealing furnace operational mode is creep mode, after reducing continuous annealing furnace furnace temperature, passes into nitrogen purging annealing furnace to replace furnace atmosphere; Pass into argon gas atmosphere again, furnace atmosphere is replaced again; Furnace atmosphere displacement, completely after (argon content reaches 99%), heats up, and to change annealing product be titanium band, and adjustment annealing furnace is normal operation mode, carries out the annealing of titanium band in continuous annealing furnace.
Embodiment 6:
An atmosphere method of replacing for continuous annealing furnace, furnace annealing product is titanium volume, and protective atmosphere is argon gas atmosphere, and arranging continuous annealing furnace operational mode is creep mode, after reducing continuous annealing furnace furnace temperature, passes into nitrogen purging annealing furnace to replace furnace atmosphere; Pass into hydrogen atmosphere again, furnace atmosphere is replaced again; After furnace atmosphere hydrogen content reaches 90%, heat up, and to change annealing product be Stainless Steel Band, adjustment annealing furnace is normal operation mode, carries out the annealing of Stainless Steel Band in continuous annealing furnace.
Claims (5)
1. the atmosphere method of replacing of a continuous annealing furnace, it is characterized in that: the protective atmosphere exchange system be equipped with by continuous annealing furnace body, in continuous annealing furnace, when titanium band anneal mode is changed mutually, complete protective atmosphere by Stainless Steel Band anneal mode replace, need to be protective atmosphere in required stove by the protective atmosphere Rapid replacement in stove according to technique, thus complete the adjustment of protective atmosphere in stove; Described protective atmosphere exchange system is connected with outer protection gas airing system; Mainly comprise the steps:
A: arranging continuous annealing furnace operational mode is creep mode, furnace annealing product is stainless-steel roll or titanium volume;
B: pass into nitrogen purging annealing furnace to replace furnace atmosphere after reducing furnace temperature;
C: according to annealing product protective atmosphere needs, pass into the protective atmosphere of needs, furnace atmosphere is replaced;
D: after furnace atmosphere is replaced, heat up, and change annealing product, adjustment annealing furnace is normal operation mode, anneals in continuous annealing furnace;
Described continuous annealing furnace change after annealing product be Stainless Steel Band anneal time, for preventing Stainless Steel Band heat-tinting, stove interior employing hydrogen nitrogen mixture is protective atmosphere, and hydrogen volume is than 75% ~ 100%; When annealing to titanium band, hydrogen nitrogen mixture in continuous annealing furnace need be purged clean, ensure that argon gas atmosphere is protective atmosphere, purity of argon is greater than 99%.
2. the atmosphere method of replacing of continuous annealing furnace according to claim 1, is characterized in that: described atmosphere method of replacing specifically comprises the steps:
When steel band produced by continuous annealing furnace, in stove, hydrogen nitrogen mixture is adopted to be protective atmosphere; When this continuous annealing furnace needs for the production of titanium band, arranging continuous annealing furnace operational mode is creep mode, reduces continuous annealing furnace furnace temperature; When annealing furnace each district furnace temperature is down to 800 DEG C, protective atmosphere exchange system is utilized to carry out nitrogen purging, progressively the hydrogen nitrogen mixture protective atmosphere in stove is replaced into nitrogen, the high-purity argon gas purging of volume fraction 99.99% is carried out again with protective atmosphere exchange system, progressively protective atmosphere in stove is replaced into required argon gas, thus meets the continuous annealing protective atmosphere needs of titanium band; When after furnace atmosphere displacement completely, after namely argon content reaches 99%, heat up in continuous annealing furnace, and connect steel band and titanium band by processing apparatus before continuous annealing furnace entrance, annealing product is replaced by titanium band; Adjustment annealing furnace is normal operation mode, carries out the annealing of titanium band in continuous annealing furnace;
When titanium band produced by continuous annealing furnace, in stove, argon gas is adopted to be protective atmosphere; When production line changes production steel band into and this continuous annealing furnace needs for the production of steel band, arranging continuous annealing furnace operational mode is creep mode, reduces continuous annealing furnace furnace temperature; Utilize protective atmosphere exchange system to carry out nitrogen purging, progressively the argon atmosphere in stove is replaced into nitrogen; Utilize protective atmosphere exchange system to pass into hydrogen when annealing furnace each district furnace temperature rises to 800 DEG C, progressively protective atmosphere in stove is replaced into required hydrogen nitrogen mixture, thus meet the continuous annealing protective atmosphere needs of steel band; After furnace atmosphere displacement completely, namely hydrogen volume than 75% ~ 100% after, heat up in continuous annealing furnace, and by processing apparatus connection titanium band and steel band before continuous annealing furnace entrance, annealing product be replaced by steel band; Adjustment annealing furnace is normal operation mode, carries out the annealing of steel band in continuous annealing furnace.
3. the atmosphere method of replacing of continuous annealing furnace according to claim 1 and 2, is characterized in that: protective atmosphere exchange system divides two subsystems, is respectively main airing system and time airing system; Main airing system atmosphere displacement the stage in stove, pass into protective atmosphere fast, secondary airing system in production phase regulating stove internal pressure to ensure furnace pressure state.
4. the atmosphere method of replacing of continuous annealing furnace according to claim 3, is characterized in that: protective atmosphere exchange system is configured in heating zone or the cooling section of continuous annealing furnace, or is configured in the transition section between heating zone and cooling section; The protective atmosphere recycle system is configured in heating zone or the cooling section of continuous annealing furnace, or is configured in the transition section between heating zone and cooling section.
5. the atmosphere method of replacing of the continuous annealing furnace according to claim 1 or 2 or 4, is characterized in that: heating zone is retort furnace; When heating zone is retort furnace, described protective atmosphere exchange system and the protective atmosphere recycle system are not all arranged on heating zone.
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