CN106854697B - A kind of method of the quick blowing out of vertical continuous annealing furnace - Google Patents
A kind of method of the quick blowing out of vertical continuous annealing furnace Download PDFInfo
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- CN106854697B CN106854697B CN201510901650.8A CN201510901650A CN106854697B CN 106854697 B CN106854697 B CN 106854697B CN 201510901650 A CN201510901650 A CN 201510901650A CN 106854697 B CN106854697 B CN 106854697B
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Abstract
The present invention relates to a kind of methods of the quick blowing out of vertical continuous annealing furnace, mainly solve when vertical continuous annealing furnace blowing out in the prior art furnace atmosphere displacement and reduce furnace temperature process it is slow, the longer technical problem of furnace outage time.A kind of method of the quick blowing out of vertical continuous annealing furnace, including：1）Closing hydrogen flowing quantity valve, 2）Transition Materials are passed through in stove, the speed of service of the Transition Materials in stove controls between 280-350mpm；3）Substep reduces furnace temperature：When the weld seam of first stage, regular burden(ing) and Transition Materials reaches final cooling section, vertical continuous annealing furnace temperature is set as 500 DEG C, and second stage, when the furnace temperature of continuous annealing furnace is down to 500 DEG C, strip is out of service in vertical continuous annealing furnace stove；Furnace temperature is set as 300-400 DEG C again；4）Substep opens the step of bell.The method of the present invention technology controlling and process is simple, effectively reduces the time of vertical continuous annealing furnace blowing out, realizes the quick blowing out of vertical continuous annealing furnace.
Description
Technical field
The present invention relates to continuous annealing furnace technical field, more particularly to the side of a kind of quick blowing out of vertical continuous annealing furnace
Method.
Background technology
Continuous annealing furnace is used to the strip for generating processing hardening after cold rolling carrying out recrystallization annealing, improves microstructure,
Plasticity and punching formation property are improved, and ensures that surface is not oxidized.Continuous annealing merges several independent processes of bell-type annealing
After a unit, the production cycle shortened to an at most hour by original 10 days or so, and production stock subtracts greatly, production process
Simplify, management is convenient, and productivity greatly improves.
Vertical continuous annealing furnace is mainly used for the annealing production of uncoated tinplate base, what the strip in stove was made of nitrogen and hydrogen
It is mixed gas protected and will not aoxidize.Therefore, it before vertical continuous annealing furnace maintenance down, needs to blow furnace atmosphere
Displacement is swept, while reducing the furnace temperature of vertical continuous annealing furnace, after furnace temperature reduces to a certain extent, bell can be opened, is carried out
Service work.
Currently, vertical continuous annealing furnace maintenance before blowing out conventional method be in stove regular burden(ing) production after, continuously move back
Stove starts to cool down, and replaces furnace atmosphere using nitrogen, furnace temperature opens bell after being less than certain temperature, starts service work again.
However, since vertical continuous annealing furnace volume is larger, and furnace temperature is higher when production, causes furnace outage time longer, seriously affects machine
The rhythm of production of group, unit efficiency is relatively low, influences unit production capacity.
Chinese Patent Application No. is that the patent application of CN 201310550386.9 discloses a kind of atmosphere of continuous annealing furnace
Method of replacing, it is characterised in that：The protective atmosphere exchange system being equipped with by continuous annealing furnace body, in continuous annealing furnace by
Stainless steel band anneal mode completes protective atmosphere displacement when mutually being converted to titanium band anneal mode, and being needed according to technique will be in stove
Protective atmosphere Rapid replacement is protective atmosphere in required stove, to complete the adjustment of protective atmosphere in stove.The reality of the patent
The crucial protection exchange system for being annealing furnace and outer protection gas air supply system are applied mutually together with when needing to replace, being first passed through
Nitrogen purges annealing furnace to replace furnace atmosphere, is needed further according to annealing product protective atmosphere, then be passed through the protective atmosphere of needs,
To furnace atmosphere into line replacement, and its annealing furnace passage is less.Therefore, this method is not particularly suited for the vertical of production tinning substrate
Formula continuous annealing furnace, and it is not suitable for the process of the displacement of the furnace atmosphere before vertical continuous annealing furnace blowing out.
Invention content
The object of the present invention is to provide a kind of methods of the quick blowing out of vertical continuous annealing furnace, solve vertical in the prior art
Furnace atmosphere displacement and reduction furnace temperature process when continuous annealing furnace blowing out is slow, the longer technical problem of furnace outage time.
The technical solution adopted by the present invention is：
A kind of method of the quick blowing out of vertical continuous annealing furnace, includes the following steps：
1) hydrogen flowing quantity valve is closed, before vertical continuous annealing furnace starts to cool down in 1.5-2 hours regular burden(ing) production processes,
Close the hydrogen control valve being passed through in stove；
2) Transition Materials are passed through and are passed through Transition Materials in vertical continuous annealing furnace after regular burden(ing) produces；In first volume transition
When about 1000 meters away from annealing furnace entrance of material head portion, by the speed of service of strip in annealing furnace by 500-650mpm during normal production
It gradually reduces as 280-350mpm；
3) vertical continuous annealing furnace furnace temperature is reduced using falling temperature method stage by stage,
When the weld seam of first stage, regular burden(ing) and Transition Materials reaches final cooling section, by the manipulation of vertical continuous annealing furnace
Pattern is switched to refrigerating mode by production model, and setting vertical continuous annealing furnace target furnace temperature is 500 DEG C, closes the electricity of each stove section
Heater, vertical continuous annealing furnace start to cool down；
Second stage, when the furnace temperature of vertical continuous annealing furnace is down to 500 DEG C, by the operation of strip in vertical continuous annealing furnace
Speed is gradually reduced to 0, and setting vertical continuous annealing furnace target furnace temperature is 300-400 DEG C, and vertical continuous annealing furnace continues to cool down
When to 300-400 DEG C of target furnace temperature, the steer mode of vertical continuous annealing furnace is switched to blowing out pattern by cooling mode；
4）Vertical continuous annealing furnace bell is opened, vertical continuous annealing furnace bringing-up section first and the last one are first turned on
This 4 furnace top covers of furnace top cover, soaking zone first and the last one furnace top cover；Secondly open bringing-up section first, centre, finally
Furnace bottom cover this 4 furnace bottom covers among one and soaking zone；It opens and vertical continuously moves back after first furnace bottom cover is opened 2-3 hours
The remaining other furnace top covers of stove and furnace bottom cover；Due to vertical continuous annealing furnace bringing-up section and soaking zone furnace temperature highest, first open
This four furnace top covers and four furnace bottom covers, can promote the quick flowing of atmosphere inside and outside bringing-up section and soaking zone stove, be conducive to add
The quick reduction of hot arc and soaking zone furnace temperature shortens furnace outage time so as to be rapidly achieved the furnace temperature of comprehensive blow-on lid.
Further, step 2 of the present invention）In vertical continuous annealing furnace temperature-fall period, Transition Materials are in vertical continuous annealing furnace
The speed of service be 280-350mpm, effect is preferred.
The applicable vertical continuous annealing furnace of the method for the present invention includes 4 bringing-up section, soaking zone, cooling section and aging section stoves
Section.
The reasons why vertical continuous annealing furnace that the present invention takes quick stopping process, is as follows：
1, the time control of hydrogen flowing quantity valve is closed
In vertical continuous annealing furnace normal productive process, furnace atmosphere is the mixed gas of 5% hydrogen and 95% nitrogen, and hydrogen
Gas and nitrogen are according to 5：Furnace atmosphere is continuously replenished in 95 ratio；And in vertical continuous annealing furnace furnace shutting down process, needing will be in stove
Nitrogen and hydrogen mixture atmosphere is all replaced into nitrogen, not hydrogen, to ensure safety when blowing out blow-on lid.The present invention is vertical continuous
Before annealing furnace starts cooling, in the normal productive process of regular burden(ing), hydrogen flowing quantity valve is closed within 1.5-2 hours in advance, is only kept
Nitrogen supplements furnace atmosphere, can slowly reduce the hydrogen content in continuous annealing furnace in protective atmosphere, reduces thermal purging process
The time of nitrogen hydrogen mixeding gas in middle displacement stove, and hydrogen content slowly reduces in protective atmosphere in stove, it will not be to regular burden(ing)
Product quality impact.
2, in vertical continuous annealing furnace cooling, the control of the speed of service of the Transition Materials in stove
Due to the operation of Transition Materials in stove, furnace interior can be taken out of and divide heat, and promote furnace gases flowing towa taud, be conducive to stand
Formula continuous annealing furnace quickly reduces the Rapid replacement of furnace temperature and furnace atmosphere；But Transition Materials are cut for continuous annealing unit specification
It changes, stop the coil of strip that transition during machine uses, Transition Materials are reusable, the transition being used under normal circumstances in furnace shutting down process
Expect that used number is more, strip is after the baking of furnace high-temperature several times, and band hardness of steel and hardness are relatively low, if the speed of service
It is too fast, it is be easy to cause the bent even broken belt of Transition Materials strip wooden dipper, to influence the blowing out work of continuous annealing furnace, when extending blowing out
Between, and cause the mass loss of Transition Materials.Therefore, in continuous annealing furnace temperature-fall period, speed of service control of the Transition Materials in stove
System is between 280-350mpm.
3, the control of vertical continuous annealing furnace blow-on
First open continuous annealing furnace bringing-up section first and the last one head cover, soaking zone first and the last one top
Lid amounts to 4 head covers；Bringing-up section first, centre, the furnace bottom cover among the last one and soaking zone are then turned on, amounts to 4
Bottom cover.Due to vertical continuous annealing furnace bringing-up section and soaking zone furnace temperature highest, this four furnace top covers and four furnace bottom covers are opened, it can
To promote the quick flowing of atmosphere inside and outside bringing-up section and soaking zone stove, be conducive to the quick reduction of bringing-up section and soaking zone furnace temperature,
So as to be rapidly achieved the furnace temperature of comprehensive blow-on lid, shorten furnace outage time.
The present invention has following good effect compared with prior art：
1, the present invention is by before vertical continuous annealing furnace cools down, closing hydrogen flowing quantity valve in 1.5-2 hours in advance, only protecting
Hold protective atmosphere in nitrogen supplementary furnace so that the hydrogen content in continuous annealing furnace in protective atmosphere can be reduced slowly, protected
Under the premise of demonstrate,proving regular burden(ing) product quality, the time of furnace atmosphere displacement during thermal purging is effectively reduced；And above-mentioned
In 1.5-2 hours times, the dosage of nitrogen is consistent with the dosage of nitrogen in normal productive process, and the present invention effectively reduces vertical
Nitrogen use level when continuous annealing furnace blowing out during thermal purging.
2, the method for the present invention controls the speed of service of the Transition Materials in continuous annealing furnace by optimizing Transition Materials, effectively improves
The reduction speed of continuous annealing furnace furnace temperature has achieved the purpose that shorten the descent of temperature time；Meanwhile reducing the wooden dipper of Transition Materials
Bent broken belt risk, reduces the mass loss of Transition Materials.
3, the method for the present invention technology controlling and process is simple, under the premise of having fully ensured that personnel and equipment safety, effectively reduces
The time of vertical continuous annealing furnace blowing out, improve the efficiency and unit production capacity of vertical continuous annealing furnace.
Specific implementation mode
With reference to embodiment, the present invention is furture elucidated, it should be understood that following specific implementation modes are only used for
It is bright the present invention rather than limit the scope of the invention.
A kind of method of the quick blowing out of vertical continuous annealing furnace, by closing hydrogen flowing quantity valve in advance, being passed through transition in stove
Volume, substep reduce furnace temperature, blowing out, the quick blowing out of blow-on lid realization vertical continuous annealing furnace,
Vertical continuous annealing furnace is in normal productive process, and protective atmosphere is the mixing of 5% hydrogen and 95% nitrogen in stove
Gas, and hydrogen and nitrogen are according to 5：95 ratio is constantly passed through in stove, the loss of protective atmosphere in supplementary furnace.Regular burden(ing) in stove
Thickness specification is 0.21mm, width 850mm, according to repair schedule arrangement, terminates the production of regular burden(ing), vertical company after 2 hours
Continuous annealing furnace starts to cool down, blowing out work before being overhauled；
At this point, closing the hydrogen control valve being passed through in stove, only nitrogen is kept to supplement furnace atmosphere, nitrogen flow 1700-
1800Nm3/ h, hydrogen content starts slowly to decline in furnace atmosphere；After regular burden(ing) produces, in vertical continuous annealing furnace stove
Transition Materials are passed through, Transition Materials thickness is 0.21-0.25mm, width 850-900mm；And first volume Transition Materials head away from
When about 1000 meters of annealing furnace entrance, in annealing furnace the speed of service of strip by 500-650mpm during normal production gradually reduce for
280-350mpm, speed of service control of the Transition Materials in stove later is between 280-350mpm；
It is vertical when the weld seam of concluding volume regular burden(ing) and first volume Transition Materials reaches the cooling section of vertical continuous annealing furnace
Continuous annealing furnace is switched to refrigerating mode by production model, and furnace temperature is set as 500 DEG C, closes the electric heater of each stove section, vertical
Continuous annealing furnace starts to cool down；Vertical continuous annealing furnace starts thermal purging simultaneously, using nitrogen to continuous annealing furnace furnace atmosphere
Into line replacement, nitrogen flow is 2800-3500Nm at this time3/h；When the furnace temperature of vertical continuous annealing furnace is down to 500 DEG C, gradually
The speed of service of strip in stove is reduced until strip is out of service；After strip is out of service in continuous annealing furnace stove, furnace temperature is set
It is set to 300-400 DEG C, continues the cooling of continuous annealing furnace, until when furnace temperature is down to 300-400 DEG C, closes all analyses in stove
Instrument, stops thermal purging, and continuous annealing furnace is switched to blowing out pattern by cooling mode；
After vertical continuous annealing furnace blowing out, continuous annealing furnace bringing-up section first and the last one furnace top cover, are first opened
Hot arc first and the last one furnace top cover amount to 4 furnace top covers；Then turn on bringing-up section first, centre, the last one and
Furnace bottom cover among soaking zone amounts to 4 furnace bottom covers, is convenient for the fast cooling of vertical continuous annealing furnace high temperature section；It waits for 2-3 hours
It opens other furnace top covers and furnace bottom cover again afterwards, completes the blowing out of vertical continuous annealing furnace.
Claims (2)
1. a kind of method of the quick blowing out of vertical continuous annealing furnace, characterized in that the described method comprises the following steps：
1) hydrogen flowing quantity valve is closed, before vertical continuous annealing furnace starts to cool down in 1.5-2 hours regular burden(ing) production processes, is closed
The hydrogen control valve being passed through in stove；
2) Transition Materials are passed through and are passed through Transition Materials in vertical continuous annealing furnace after regular burden(ing) produces；In first volume transition material head
When 1000 meters away from annealing furnace entrance of portion, the speed of service of strip in annealing furnace is gradually dropped by 500-650mpm during normal production
Low is 280-350mpm；
3) vertical continuous annealing furnace furnace temperature is reduced using falling temperature method stage by stage,
When the weld seam of first stage, regular burden(ing) and Transition Materials reaches final cooling section, by the steer mode of vertical continuous annealing furnace
Refrigerating mode is switched to by production model, setting vertical continuous annealing furnace target furnace temperature is 500 DEG C, closes the electrical heating of each stove section
Device, vertical continuous annealing furnace start to cool down；
Second stage, when the furnace temperature of vertical continuous annealing furnace is down to 500 DEG C, by the speed of service of strip in vertical continuous annealing furnace
It gradually reduces to 0, setting vertical continuous annealing furnace target furnace temperature is 300-400 DEG C, and vertical continuous annealing furnace continues to be cooled to mesh
When marking 300-400 DEG C of furnace temperature, the steer mode of vertical continuous annealing furnace is switched to blowing out pattern by cooling mode；
4) vertical continuous annealing furnace bell is opened, vertical continuous annealing furnace bringing-up section first and the last one furnace roof are first turned on
Lid, soaking zone first and the last one furnace top cover this 4 furnace top covers；Secondly open bringing-up section first, centre, the last one
And the furnace bottom cover among soaking zone this 4 furnace bottom covers；Vertical continuous annealing furnace is opened after first furnace bottom cover is opened 2-3 hours
Remaining other furnace top covers and furnace bottom cover.
2. a kind of method of the quick blowing out of vertical continuous annealing furnace as described in claim 1, characterized in that described vertical continuous
In annealing furnace temperature-fall period, the speed of service of the Transition Materials in vertical continuous annealing furnace is 280-350mpm.
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| CN112981091B (en) * | 2019-12-12 | 2022-04-15 | 上海梅山钢铁股份有限公司 | Control method for fast conveying belt after shutdown of continuous annealing furnace |
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| 真空连续生产;湖南株洲21号信箱生产指挥部技术情报室编;《硬质合金》;19721231(第1期);第48页 * |
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