CN108070707A - A kind of method of the quick furnace lifting of vertical continuous annealing furnace - Google Patents
A kind of method of the quick furnace lifting of vertical continuous annealing furnace Download PDFInfo
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- CN108070707A CN108070707A CN201611004437.8A CN201611004437A CN108070707A CN 108070707 A CN108070707 A CN 108070707A CN 201611004437 A CN201611004437 A CN 201611004437A CN 108070707 A CN108070707 A CN 108070707A
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
- C21D9/54—Furnaces for treating strips or wire
- C21D9/56—Continuous furnaces for strip or wire
- C21D9/561—Continuous furnaces for strip or wire with a controlled atmosphere or vacuum
Abstract
The present invention relates to a kind of method of the quick furnace lifting of vertical continuous annealing furnace, solve the problem of after vertical continuous annealing furnace maintenance down in the prior art that the furnace lifting time longer influences rhythm of production and production capacity.The method of the quick furnace lifting of vertical continuous annealing furnace of the present invention, including：After vertical continuous annealing furnace overhauls, the furnace lifting condition of vertical continuous annealing furnace is confirmed；The furnace atmosphere of vertical continuous annealing furnace carries out pure nitrogen gas purging；Vertical continuous annealing furnace heats up；The furnace atmosphere of vertical continuous annealing furnace carries out hydrogeneous purging；Vertical continuous annealing furnace strip is controlled to start operation.The method of the present invention is simple to operation, effectively increases the production efficiency and production capacity of vertical continuous annealing furnace.
Description
Technical field
The present invention relates to the technical field of vertical continuous annealing furnace, more particularly to a kind of quick furnace lifting 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 be mainly used for uncoated tinplate base annealing production, vertical continuous annealing furnace by preheating section (JPF),
Bringing-up section (RTF), soaking zone (SF), slow cooling section (SCS), rapid cooling section (RCS), aging section 1 (OAS1), aging section 2 (OAS2), when
Imitate section 3 (OAS3), final cooling section (FCS) and water quenching cooling section composition.The gas that strip in stove is made of nitrogen and hydrogen
It protects and will not aoxidize.Therefore, it is necessary to be purged to furnace atmosphere before vertical continuous annealing furnace maintenance down blow-on lid
Displacement is carried out at the same time cooling operation.After maintenance terminates, it is necessary to be purged to the atmosphere in stove before start production, arrange
Except the air in stove, the protective gas being made of nitrogen and hydrogen is replaced as, treats that stove internal oxidition amount is reduced to and meets production requirement
In the range of, and furnace temperature is warming up to and normally produces required temperature, required for strip speed reaches normal production in stove
Speed, production model could be switched and carry out production merchantable timber.However, since the general volume of vertical continuous annealing furnace is larger, and
Furnace temperature is higher during production, and the furnace atmosphere purge time after being overhauled so as to cause annealing furnace during furnace lifting is longer, when preparing before producing
Between it is longer, cause the continuous annealing furnace furnace lifting time longer, seriously affect the rhythm of production of continuous annealing furnace, influence unit production capacity.
Application publication number is that the Chinese patent of CN103710524A discloses a kind of Ignition method of continuous annealing furnace,
Comprise the following steps：1) to NOF stoves, RTF stoves, SF stoves, RJC stoves leak test, pipeline leak test；2) confirm that each valve of pipeline and stokehold closes
It closes, zero valve is closed；3) zero valve blind plate of nitrogen is extracted first, and each valve of pipeline is opened with this；4) oxygen content in stove is measured；
5) zero valve of nitrogen and each valve of gaspipe line are opened successively；6) nitrogen purging gas pipeline valve is closed, blocks up nitrogen purging coal gas
Blind plate；7) detonation experiment is done after coal gas replacement；8) stokehold igniting will open burner one by one, and burner is lighted a fire one by one.The spy of the patent
Point be effectively prevent due to valve leaks or blind plate not sternly etc. caused by gas leakage, thoroughly avoided from angle is misplaced
Gas leakage caused by during annealing furnace furnace lifting is in stove or even the hidden danger such as explosion, ensure that in the safety and stove of furnace lifting
Protective atmosphere, but the patent only accounts for the security of Ignition process, does not refer to the specific method in purge
And parameter, it is affected to rhythm of production.
The Chinese patent document that application publication number is CN103555926A discloses a kind of atmosphere displacement of continuous annealing furnace
Method, it is characterised in that：The protective atmosphere exchange system being equipped with by continuous annealing furnace body, by stainless in continuous annealing furnace
Strip anneal pattern completes protective atmosphere displacement when mutually being converted to titanium band anneal mode, is needed according to technique by the protection in stove
Atmosphere Rapid replacement is protective atmosphere in required stove, so as to complete the adjustment of protective atmosphere in stove.The implementation of the patent is closed
Key is that the protection exchange system of annealing furnace, mutually together with, it is necessary to when replacing, is first passed through nitrogen with outer protection gas air supply system
Annealing furnace is purged to replace furnace atmosphere, is needed further according to annealing product protective atmosphere, then is passed through the protective atmosphere of needs, to stove
Interior atmosphere is into line replacement, and its annealing furnace passage is less (2 passages of vertical annealing furnace, 1 passage of Horizental annealer), therefore,
This method is not particularly suited for the vertical continuous annealing furnace of production tinning substrate.
Application publication number is that the Chinese patent document of CN103276191A discloses one kind for low-carbon cold rolling steel plate annealing
Blowing method, blowing method first carry out walk-through oxygen nitrogen flushing at least one hour to the oxygen content in annealing furnace be less than 1%,
Then carry out denitrogen and blow the hydrogen at least 50 minutes nitrogen discharged in the annealing furnace, then protected in heating process
Property blows hydrogen to steel roll temperature and reaches 650 DEG C, while ensures that the protectiveness blows the purging duration of hydrogen from proceeding by the protection
Property when blowing hydrogen from continue at least eight hours, then restoring again property blows hydrogen and fillibility blows hydrogen, completes once to low-carbon cold rolling
The purging work of steel plate annealing processing.The characteristics of patent, is applied in the annealing production process of bell type annealing furnace, and uncomfortable
For the purge before vertical continuous annealing furnace start production.
Application publication number is that the Chinese patent document of CN104212952A discloses atmosphere in a kind of vertical continuous annealing furnace stove
The subsection blowing control method enclosed, for the inventive method its main feature is that when cold blowing is swept in stove, bleeding valve opening degree sets 30%；
It is 480 DEG C -520 DEG C to make bringing-up section, soaking zone temperature, and slow cooling section, rapid cooling section temperature are 240 DEG C -260 DEG C, and aging section temperature is
440℃-460℃；When atmosphere oxygen content≤5000ppm in stove, purged using nitrogen hydrogen mixeding gas.The characteristics of invention is logical
The opening degree and furnace temperature of setting bleeding valve are crossed, facilitates the outflow of oxygen-containing gas in stove；But due to vertical continuous annealing furnace
The furnace body size of each stove section is different with structure, and the fall off rate of oxygen content is different in each stove section, cannot be real using the inventive method
The now difference control of each stove section, be easy to causeing the slow stove section of some oxygen content fall off rate influences the purging of entire continuous annealing furnace
Time, so as to affect the effective production time of unit and unit production capacity.Meanwhile further effectively to reduce vertical continuous annealing
The stove furnace lifting time, vertical continuous annealing furnace steam line has carried out part and has transformed, after which is not suitable for pipeline modification
Vertical continuous annealing furnace.
The content of the invention
The object of the present invention is to provide a kind of methods of the quick furnace lifting of vertical continuous annealing furnace, solve vertical in the prior art
The furnace lifting time is longer after continuous annealing furnace maintenance down, the problem of influencing rhythm of production and unit production capacity.
The present invention is realized by the purging of vertical continuous annealing furnace stokehold, heating, the optimization for starting the methods of running
Quick furnace lifting after vertical continuous annealing furnace maintenance down shortens the furnace lifting time, improves the effective production time of unit and unit production
Can, the waste of the media such as nitrogen is reduced, reduces the mass loss of transition volume.
The technical solution adopted by the present invention is：A kind of method of the quick furnace lifting of vertical continuous annealing furnace, this method include：
After vertical continuous annealing furnace overhauls, the furnace lifting condition of vertical continuous annealing furnace is confirmed；It is vertical continuously to move back
The furnace atmosphere of stove carries out pure nitrogen gas purging；Vertical continuous annealing furnace heats up；In the stove of vertical continuous annealing furnace
Atmosphere carries out hydrogeneous purging；Vertical continuous annealing furnace strip is controlled to start operation.
The step of furnace lifting condition of the confirmation vertical continuous annealing furnace is the furnace top cover for confirming vertical continuous annealing furnace
Installation is complete and leakproofness is good with furnace bottom cover, confirms that water level of quenching is in work liquid level, confirms inlet/outlet sealed roller
In input state, wind turbine power transmission is confirmed, confirm that the leakproofness of vertical continuous annealing furnace is good and possess furnace lifting condition.
The step of furnace atmosphere progress pure nitrogen gas purging of the vertical continuous annealing furnace is to open nitrogen flow valve
With the steam line valve of each stove section of vertical continuous annealing furnace, carried out using the furnace atmosphere of the vertical continuous annealing furnace of pure nitrogen gas
Displacement purging, the flow of nitrogen are not less than 7500Nm3/h。
The step of vertical continuous annealing furnace is heated up is bringing-up section and soaking zone in vertical continuous annealing furnace
Radiant tube start firing up, set vertical continuous annealing furnace first stage furnace temperature as 300 DEG C；Set vertical continuous annealing furnace
Second stage furnace temperature is 500 DEG C；The electric heater of aging section is opened, electric heater capacity is controlled 60%.
The step of furnace atmosphere progress hydrogeneous purging of the vertical continuous annealing furnace is to treat vertical continuous annealing furnace
Furnace temperature reach 500 DEG C after, carry out nitrogen and hydrogen mixing, nitrogen and hydrogen mixed proportion are 95:5, using nitrogen and hydrogen
The furnace atmosphere of the vertical continuous annealing furnace of mixed gas continue to purge.
Described the step of vertical continuous annealing furnace strip is controlled to start operation, is, in the furnace atmosphere of vertical continuous annealing furnace
During oxygen content≤300ppm, the strip manipulated in vertical continuous annealing furnace brings into operation, the furnace temperature setting of vertical continuous annealing furnace
Value rises to 550 DEG C by 500 DEG C, and the steel strip in continuous annealing furnace speed of service is 50-60mpm.
Further, the vertical continuous annealing furnace furnace atmosphere carry out pure nitrogen gas purging the step of be, by rapid cooling
Section, aging section 1, aging section 2, aging section 3 and the opening degree of cold section of bleeding valve is opened manually to 100% eventually, to preheating section,
The opening degree of bringing-up section and slow cooling section bleeding valve is first set as 0, and soaking zone bleeding valve opening degree is set as 50%；It adjusts
The opening degree of preheating section, bringing-up section, soaking zone and slow cooling section diffusion valve is controlled, controls furnace pressure >=130Pa of vertical continuous annealing furnace.
Further, the vertical continuous annealing furnace furnace atmosphere carry out hydrogeneous purging the step of be, it is vertical
After when the hydrogeneous purging beginning 1 of furnace atmosphere of continuous annealing furnace is small, by the bleeding valve opening of all vertical continuous annealing furnaces
Degree is adjusted to 50%, controls furnace pressure >=200Pa of vertical continuous annealing furnace.
The reasons why the method for the present invention parameter setting, is as follows：
1st, the setting of diffusion valve opening degree
Since the furnace body of the aging section 1 of vertical continuous annealing furnace, aging section 2,3 three sections of aging section is longer, in furnace lifting process
In, three sections of oxygen content decline is most slow, is the main reason for causing the furnace lifting time longer.The present invention is purged using in pure nitrogen gas
In the process by rapid cooling section, aging section 1, aging section 2, aging section 3 and eventually cold section bleeding valve opening degree open manually to
100%, be conducive to the quick discharge of aging section 1, aging section 2, the in vivo atmosphere of 3 stove of aging section, it is quick reduce aging section 1, when
Oxygen content in effect section 2,3 furnace body of aging section in atmosphere is conducive to shorten entire vertical continuous annealing furnace furnace atmosphere displacement
Time.Simultaneously as having newly increased the nitrogen by-pass line of hybrid station 2, aging section 1, aging section 2 and aging section 3 respectively increase by one
Road purging pipeline so that the purging nitrogen flow into aging section 1, aging section 2,3 stove section of aging section increases 1500Nm3/
H, thus by rapid cooling section, aging section 1, aging section 2, aging section 3 and eventually cold section bleeding valve opening degree open manually to
When 100%, furnace pressure will not be caused too low, not less than on the premise of 13dapa, aging section 1, aging section can be promoted ensureing furnace pressure
2nd, in 3 furnace body of aging section atmosphere quick discharge.
2nd, during firing up temperature setting
After pure nitrogen gas purging starts, vertical continuous annealing furnace firing up makes furnace atmosphere be heated, and is conducive to gas in stove
The quick exclusion of atmosphere, can effectively reduce purge time；But pure nitrogen gas purge just start when, in furnace atmosphere oxygen content compared with
Height, excessively high temperature are easy to cause transition coiled strip steel severe oxidation in stove, are opened so as to cause the strip in vertical continuous annealing furnace
Operation strip begin there are larger wooden dipper song broken belt risk, therefore, in vertical continuous annealing furnace firing up step, furnace temperature is first set
For 300 DEG C, the electrical heating power of aging section 1, aging section 2 and aging section 3 is opened to 60%, and after half an hour, the oxygen of furnace atmosphere contains
Amount has been greatly reduced, then furnace temperature is set as 500 DEG C.
3rd, in vertical continuous annealing furnace stove strip start the speed of service setting
Since vertical continuous annealing furnace furnace body is larger, and the air inlet due to purge gas and furnace roof diverging duct position
Limitation, there are gas displacement dead zone in stove, oxygen content is caused in part stove section and the atmosphere of subregion to decline slow, so as to
Influence the purge time of entire annealing furnace and furnace lifting time.Strip starts operation in stove, and the movement of strip can be utilized to accelerate stove
The flowing of interior atmosphere is conducive to the Rapid replacement of furnace atmosphere.Therefore when oxygen content≤300ppm in furnace atmosphere, band in stove
Steel starts operation.Simultaneously as strip is rolled up for transition in stove at this time, and oxygen content is higher in stove, transition volume
In stove after baking and oxidation after a while, the strength reduction of transition coiled strip steel, if strip speed is too fast, meeting
It causes strip wooden dipper bent, and causes being increased by amount of oxidation for strip, the mass loss that transition is caused to roll up；If strip speed
It is too low, it is unfavorable for the flowing of furnace atmosphere, it is impossible to achieve the purpose that promote furnace atmosphere Rapid replacement.Therefore, furnace atmosphere is treated
During middle oxygen content≤300ppm, strip starts operation in stove, and strip speed is 50-60mpm in stove.
The present invention has following good effect compared with prior art：1st, the present invention is put by vertical continuous annealing furnace furnace roof
Dissipate the control and regulation of valve opening degree so that the quick exclusion of annealing furnace aging section 1, aging section 2, the in vivo atmosphere of 3 stove of aging section,
Quickly reduce the oxygen content of this three stoves section；And pass through firing up in stove, improve the temperature of furnace atmosphere and treat furnace atmosphere
During middle oxygen content≤300ppm, the method that the strip in vertical continuous annealing furnace brings into operation is manipulated, is effectively shortened entire vertical
The time of formula continuous annealing furnace furnace atmosphere displacement, realize the quick furnace lifting of vertical continuous annealing furnace.2nd, the present invention is by point
Strip speed control when the strip in temperature control and manipulation vertical continuous annealing furnace during fire heating brings into operation, is ensureing
While furnace atmosphere Rapid replacement, the wooden dipper style of song danger that transition is rolled up in stove is effectively reduced, reduces the hair that transition volume is aoxidized
Raw amount, reduces the mass loss of transition volume, while reduces the broken belt risk during vertical continuous annealing furnace furnace lifting.3rd, originally
Inventive method is simple to operation, is slightly improved on conventional vertical continuous annealing furnace, you can realize vertical continuous annealing furnace
Quick furnace lifting effectively increases the production efficiency and production capacity of vertical continuous annealing furnace.
Specific embodiment
With reference to embodiment, the present invention is furture elucidated, it should be understood that following specific embodiments 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 furnace lifting of vertical continuous annealing furnace, this method include：
After vertical continuous annealing furnace overhauls, the furnace lifting condition of vertical continuous annealing furnace is confirmed；It is vertical continuously to move back
The furnace atmosphere of stove carries out pure nitrogen gas purging；Vertical continuous annealing furnace heats up；In the stove of vertical continuous annealing furnace
Atmosphere carries out hydrogeneous purging；Vertical continuous annealing furnace strip is controlled to start operation.
The step of furnace lifting condition of the confirmation vertical continuous annealing furnace is the furnace top cover for confirming vertical continuous annealing furnace
Installation is complete and leakproofness is good with furnace bottom cover, confirms that water level of quenching is in work liquid level, confirms inlet/outlet sealed roller
In input state, wind turbine power transmission is confirmed, confirm that the leakproofness of vertical continuous annealing furnace is good and possess furnace lifting condition.
The step of furnace atmosphere progress pure nitrogen gas purging of the vertical continuous annealing furnace is to open 1 He of hybrid station
The steam line valve of each stove section of nitrogen flow valve and vertical continuous annealing furnace of hybrid station 2 opens 2# hybrid station nitrogen pipelines
Newly-increased bypath valve opens aging section 1, aging section 2,1,2, the 3 leg bypass valve of newly-increased pipeline of aging section 3, nitrogen
Flow control is 7500Nm3/ h is purged using the furnace atmosphere of the vertical continuous annealing furnace of pure nitrogen gas into line replacement；By rapid cooling
Section, aging section 1, aging section 2, aging section 3 and the opening degree of cold section of bleeding valve is opened manually to 100% eventually, to preheating section,
The opening degree of bringing-up section and slow cooling section bleeding valve is first set as 0, and soaking zone bleeding valve opening degree is set as 50%；It adjusts
The opening degree of preheating section, bringing-up section, soaking zone and slow cooling section diffusion valve is controlled, controls furnace pressure >=130Pa of vertical continuous annealing furnace.
Pure nitrogen gas purging start after, vertical continuous annealing furnace carries out igniting preparation immediately, to exhaust piping carry out purging and
After the completion of gas piping leakage test, exhaust piping purging and gas piping leakage test, bringing-up section in vertical continuous annealing furnace
Start firing up with the radiant tube of soaking zone, set vertical continuous annealing furnace first stage furnace temperature as 300 DEG C；Aging section 1, when
The electrical heating power of effect section 2 and aging section 3 is opened to 60%；Radiant tube firing up half an hour in hot arc and soaking zone to be added
Afterwards, vertical continuous annealing furnace second stage furnace temperature is set as 500 DEG C.
The step of furnace atmosphere progress hydrogeneous purging of the vertical continuous annealing furnace is vertical continuous annealing furnace stove
After temperature reaches 500 DEG C, open hydrogen control valve door and carry out nitrogen and hydrogen mixing, nitrogen and hydrogen mixed proportion are 95:5, it adopts
Continue to purge with atmosphere in the vertical continuous annealing furnace stove of the mixed gas of nitrogen and hydrogen；Vertical continuous annealing furnace is hydrogeneous
Purging start 1 it is small when after, all bleeding valve opening degrees are adjusted to 50%, control the furnace pressure of vertical continuous annealing furnace >=
200Pa。
Described the step of vertical continuous annealing furnace strip is controlled to start operation is the furnace atmosphere for treating vertical continuous annealing furnace
During middle oxygen content≤300ppm, the strip manipulated in vertical continuous annealing furnace brings into operation, steel strip in continuous annealing furnace operation speed
It spends for 50-60mpm, the furnace temperature of vertical continuous annealing furnace is set as 550 DEG C；Treat oxygen content in the stove of vertical continuous annealing furnace≤
During 100ppm, vertical continuous annealing furnace starts to warm up raising speed, and the quick furnace lifting of vertical continuous annealing furnace is completed.
In addition to the implementation, the present invention can also have other embodiment.It is all to use equivalent substitution or equivalent transformation shape
Into technical solution, all fall within the present invention claims protection domain.
Claims (3)
1. a kind of method of the quick furnace lifting of vertical continuous annealing furnace, it is characterized in that, this method includes：
After vertical continuous annealing furnace overhauls, the furnace lifting condition of vertical continuous annealing furnace is confirmed；Vertical continuous annealing furnace
Furnace atmosphere carry out pure nitrogen gas purging；Vertical continuous annealing furnace heats up；The furnace atmosphere of vertical continuous annealing furnace
Carry out hydrogeneous purging；Vertical continuous annealing furnace strip is controlled to start operation；The confirmation vertical continuous annealing furnace plays fire bars
The step of part be confirm vertical continuous annealing furnace furnace top cover and furnace bottom cover installation is complete and leakproofness is good, confirmation is quenched
Water level is in work liquid level, confirms that inlet/outlet sealed roller is in input state, confirms wind turbine power transmission, and confirmation is vertical continuously to move back
The leakproofness of stove is good and possesses furnace lifting condition；The furnace atmosphere of the vertical continuous annealing furnace carries out pure nitrogen gas purging
The step of be to open the steam line valve of nitrogen flow valve and each stove section of vertical continuous annealing furnace, it is vertical using pure nitrogen gas
The furnace atmosphere of continuous annealing furnace is purged into line replacement, and the flow of nitrogen is not less than 7500Nm3/h；It is described vertical continuously to move back
The step of stove is heated up is that the radiant tube of bringing-up section and soaking zone starts firing up in vertical continuous annealing furnace, setting
Vertical continuous annealing furnace first stage furnace temperature is 300 DEG C；Vertical continuous annealing furnace second stage furnace temperature is set as 500 DEG C；It opens
The electric heater of aging section, electric heater capacity are controlled 60%；The furnace atmosphere of the vertical continuous annealing furnace carries out
The step of hydrogeneous purging, is, after the furnace temperature of vertical continuous annealing furnace reaches 500 DEG C, carry out nitrogen and hydrogen mixing, nitrogen and
Hydrogen mixed proportion is 95:5, the furnace atmosphere using the vertical continuous annealing furnace of the mixed gas of nitrogen and hydrogen continues
Purging；Described the step of vertical continuous annealing furnace strip is controlled to start operation is oxygen in the furnace atmosphere of vertical continuous annealing furnace
During content≤300ppm, the strip manipulated in vertical continuous annealing furnace brings into operation, the furnace temperature setting value of vertical continuous annealing furnace
550 DEG C are risen to by 500 DEG C, the steel strip in continuous annealing furnace speed of service is 50-60mpm.
2. a kind of method of the quick furnace lifting of vertical continuous annealing furnace as described in claim 1, it is characterized in that, the vertical company
The step of furnace atmosphere of continuous annealing furnace carries out pure nitrogen gas purging is, by rapid cooling section, aging section 1, aging section 2, aging section 3 and end
The opening degree of cold section of bleeding valve is opened manually to 100%, to the opening of preheating section, bringing-up section and slow cooling section bleeding valve
Degree is first set as 0, and soaking zone bleeding valve opening degree is set as 50%；Regulate and control preheating section, bringing-up section, soaking zone and slow cooling section
The opening degree of diffusion valve controls furnace pressure >=130Pa of vertical continuous annealing furnace.
3. a kind of method of the quick furnace lifting of vertical continuous annealing furnace as described in claim 1, it is characterized in that, described is vertical
The step of furnace atmosphere progress hydrogeneous purging of continuous annealing furnace is that the hydrogeneous purging of furnace atmosphere of vertical continuous annealing furnace is opened
Begin 1 it is small when after, the bleeding valve opening degree of all vertical continuous annealing furnaces is adjusted to 50%, controls vertical continuous annealing furnace
Furnace pressure >=200Pa.
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| CN110819772A (en) * | 2019-10-28 | 2020-02-21 | 鞍钢股份有限公司 | Nitrogen-hydrogen protective gas control method for continuous annealing furnace |
| CN114231704A (en) * | 2021-12-20 | 2022-03-25 | 本钢板材股份有限公司 | Method for quickly replacing atmosphere in vertical annealing furnace |
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| CN108070707B (en) | 2019-10-18 |
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