EP2701121B1 - Continuous heating device - Google Patents

Continuous heating device Download PDF

Info

Publication number
EP2701121B1
EP2701121B1 EP12816425.8A EP12816425A EP2701121B1 EP 2701121 B1 EP2701121 B1 EP 2701121B1 EP 12816425 A EP12816425 A EP 12816425A EP 2701121 B1 EP2701121 B1 EP 2701121B1
Authority
EP
European Patent Office
Prior art keywords
combustion
strip material
time
temperature
segments
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Not-in-force
Application number
EP12816425.8A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP2701121A4 (en
EP2701121A1 (en
Inventor
Hiroo Nakagawa
Toshikazu Hada
Mitsuhiro Hida
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Chugai Ro Co Ltd
Original Assignee
Chugai Ro Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Chugai Ro Co Ltd filed Critical Chugai Ro Co Ltd
Publication of EP2701121A1 publication Critical patent/EP2701121A1/en
Publication of EP2701121A4 publication Critical patent/EP2701121A4/en
Application granted granted Critical
Publication of EP2701121B1 publication Critical patent/EP2701121B1/en
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D21/00—Arrangements of monitoring devices; Arrangements of safety devices
    • 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
    • C21D11/00—Process control or regulation for heat treatments
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
    • F27B9/28—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity for treating continuous lengths of work
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
    • F27B9/30—Details, accessories, or equipment peculiar to furnaces of these types
    • F27B9/40—Arrangements of controlling or monitoring devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D19/00—Arrangements of controlling devices

Definitions

  • Present invention relates to continuous heating apparatus.
  • a finally achieving temperature of the strip material varies depending on not only a furnace temperature but also a conveying speed for the strip material.
  • a looper which is a buffer device for absorbing a difference between conveying speeds of the heating furnace and the other device is often provided.
  • the looper can not absorb the difference of the conveying speed. And therefore, the operation of the heating furnace should be stopped.
  • the strip material is heated to a temperature higher than the final achieving temperature so as to embrittle, and therefore a problem that the strip material fractures when restarting is caused..
  • a conventional continuous heating apparatus shut down the combustion in the heating furnace, when a buffer amount of looper is small, so as to decease the furnace temperature to a safety temperature at which the strip material does not embrittle
  • the conveying of the strip material can not be stopped. Therefore, the strip material passed through the heating furnace in this time period is unmarketable.
  • a restart of combustion takes long time, and therefore a problem that a down time is get longer arises.
  • an object of the present invention is to provide a continuous heating apparatus which can maintain an appropriate hating of strip material the as much as possible even if a remaining amount of looper is reduced, and which can reliably decrease the furnace temperature to a temperature equal to or less than the safety temperature.
  • a continuous heating apparatus comprises a heating furnace having combustion segments in which combustion amounts can be individually controlled and which are arranged in series, for continuously heating a strip material in a manner that a conveying speed for the strip material is controlled so as to maintain a final achieving temperature of the strip material at a predetermined target temperature, and a looper which is arranged in series with the heating furnace, through which the strip material passes and which can adjust an length of the strip material accumulated inside, and characterized in that the continuous heating apparatus comprises a controller for controlling the combustion amounts in the combustion segments respectively according to a surplus time as a remaining adjustment capacity of the looper in the length of the strip material divided by the conveying speed for the strip material in the heating furnace wherein the controller controls the combustion amounts in the combustion segments respectively so that internal temperatures of the combustion segments are maintained at respectively predetermined preset temperatures if the surplus time is longer than a predetermined preset time, and varies the combustion amounts in the combustion segments respectively in a predetermined profile with respect to the surplus time if the
  • the speed of the strip material is reduced by an amount corresponding to a decrement of the furnace temperature due to the reduction of combustion amount.
  • the combustion amount is reduced so that the furnace temperature gets closer to the safety temperature at which the strip material does not fracture when stopping, as well as prevent complete shutdown of the heating furnace as much as possible so as to allow the production to be maintained.
  • the combustion amount may be varied at a larger decreasing rate as higher the preset temperature is, in the profile.
  • the total heat amount of the heating furnace can be inhibited from reducing.
  • the preset time may be same for the all combustion segments.
  • the preset time may be longer as higher the preset temperature is.
  • the combustion segment with a high preset temperature starts to reduce the combustion amount earlier. Therefore, a balance between the reduction of the combustion amount due to reduction of surplus time and a function of increasing of the surplus time by decreasing of the furnace temperature can be optimized, and hence the furnace temperature can be surely decreased when stopping of the line.
  • the combustion amount in the combustion segment may get closer to a certain combustion amount corresponding to a predetermined safety temperature as shorter the surplus time is, in the profile.
  • the furnace temperature is increased according to the reduction of the surplus time. Therefore, reduction of the production volume (the conveying speed for the strip material) due to the reduction of the total heat amount of the heating furnace can be minimized.
  • the controller may determine the combustion amount in the combustion segments respectively with reference to the combustion amount in the combustion segment at a time that the surplus time has reached the preset time.
  • the controller in a case where the combustion amount in the combustion segment according to the surplus time is less than a predetermined lower limit, the controller may set the combustion amount in the combustion segment at the lower limit if an equipment connected via the looper is not completely stopped, the controller may shut down the combustion in the combustion segment if an equipment connected via the looper is completely stopped.
  • the combustion amount in the heating furnace is varied in response to the surplus time that is a remaining capacity for the adjustment of the strip material by the looper divided by the conveying speed for the strip material. Therefore, the operation of the heating furnace is not stopped as much as possible, and the furnace temperature can be sufficiently decreased when the heating furnace is shut down.
  • FIG. 1 shows a configuration of a continuous heating apparatus as one embodiment of the present invention.
  • This continuous heating apparatus comprises a welding device 1, a looper 2 and a heating furnace 3 arranged in this order, and is passed continuously by a strip material 4 through.
  • the strip material 4 is supplied in a form of a reel 5.
  • the welding device 1 is to weld a posterior edge of a strip material 4 of a precedent reel 5 with a leading edge of a strip material 4 of a following reel 5.
  • the looper 2 is arranged downstream of the welding device 1. And, the looper 2 can adjust a length of the strip material 4 accumulated inside, by a movable roller 6 which is movable in a direction of an arrow in Fig. 1 . Thereby, a conveying speed for the upstream strip material 4 (in the welding device 1) can be differed from a conveying speed for the downstream strip material 4 (in the heating furnace 3).
  • the heating furnace 3 is arranged downstream of the looper 2 and divided into a plurality of combustion segments H1-H8, and has a controller 7 for controlling operation of the heating furnace 3.
  • the combustion segments H1-H8 have respectively furnace temperature sensors 9 for detecting temperatures inside the furnace.
  • the controller 7 controls combustion amounts of respective burners 8, for instance by publicly known PID control, so as to maintain the furnace temperatures of the combustion segments at preset temperatures set individually.
  • Fig. 2 shows also a safety temperature at which if the strip material 4 is stopped to be left inside the furnace for a long time, the strip material 4 does not embrittle, so as not to fracture under a tension force at restating.
  • the heating furnace 3 further has a product temperature sensor 10 for detecting a final achieving temperature of the strip material 4 in the most downstream position, and a conveying roller 11 defining the conveying speed for the strip material 4.
  • the controller 7 controls the speed of the conveying roller 11, for instance by the publicly known PID control, so as to maintain the final achieving temperature detected by the product temperature sensor 10 at a predetermined target temperature.
  • the continuous heating apparatus as this embodiment has a position detector 12 for detecting a position of the movable roller 6 of the looper 2 so that the continuous heating apparatus can calculates a remaining amount of adjustable length of the strip material by the looper 2, that is the length of the strip material 4 which can be feed continuously into the heating furnace 3 in the case that the welding device 1 stops at the time. Further, the controller 7 calculates a surplus time T that is as the remaining amount of the length of the strip material 4 adjustable by the looper 2 divided by the conveying speed for the strip material in the heating furnace 3, the conveying speed being proportional to a revolving speed of the conveying roller 11.
  • the controller 7 compares the calculated surplus time T with preset times Ts predetermined respectively for the combustion segments. If the surplus time T is longer than the preset time Ts (e.g. 30 sec), the controller 7 performs a normal operation in which the furnace temperature of each combustion segment is maintained at preset temperatures set individually. However, if the surplus time T is shorter than the preset time Ts, the controller 7 adjusts the combustion amount in the subject combustion segment, according to the profile sown in Fig. 3 , with respect to the surplus time T.
  • the profile of the combustion amount is determined as in a percentage wherein the combustion amount of the burner 8 at the time the controller 7 has recognized the surplus time T as being equal to or less than the preset time Ts is 100% (combustion amount ratio).
  • the combustion amount is prevented from changing rabidly when switching to the control to determine the combustion amount in response to the surplus time T from the normal control to maintain the furnace temperature at the preset temperature, even if the relationship between the furnace temperature and the combustion amount is changed depending on outside temperature and/or humidity.
  • the profile of an absolute value of the combustion amount may be provided.
  • the surplus time T is equal or less than the preset time Ts
  • the combustion amounts in the respective combustion segments are reduced according to the profile shown in Fig. 3 .
  • the controller 7 decrease the revolving speed of the conveying roller 11 so as not to decrease the final achieving temperature of the strip material 4. This control reduces conveying speed for the strip material 4 in the heating furnace 3, and therefore functions to suppress decreasing of the surplus time T.
  • the conveying speed for the strip material 4 in the heating furnace 3 is slower than the conveying speed for the strip material 4 in the welding device 1
  • the remaining capacity in the length of the strip material 4 adjustable in the looper 2 is increased so as to increase the surplus time T. If the surplus time T is increased to increase the combustion amount so that the furnace temperature is increased, the conveying speed for the strip material in the heating furnace 3 gets higher.
  • a variation in the furnace temperature is caused in a delayed fashion with reference to a variation in the combustion amount because of the heat capacity of the furnace body and so on. Therefore, in the preset invention, by adjusting the combustion amount in response to the surplus time T without waiting a change in the furnace temperature, the furnace temperature can be decreased to a temperature equal to or lower than the safety temperature before the remaining capacity in the length of the strip material 4 adjustable in the looper 2 falls down. To this end, the preset time T and the profile of the combustion amount should be determined so that the furnace temperature can be lowered to below the safe temperate in the combustion segment with the highest preset temperature.
  • the combustion amount is proportional to the surplus time T, and its slope S is determined in response to the difference between the preset temperature and the safety temperature for each combustion segment as shown in Fig. 4 .
  • the slope S of the combustion amount profile gets larger as higher the preset temperature with reference to the safety temperature is, so as to increase varying ratio of the combustion amount.
  • the slope S is a negative value so that the combustion amount is increased with decreasing of the surplus time T.
  • the combustion amount predicted for a time that the surplus time T has been zero should be smaller than the combustion amount predicted to make the furnace temperature as the safety temperature.
  • Such setting of the slope S makes the combustion amount in each combustion segment closer to the combustion amount corresponding to the safety temperature that is a combustion amount predicted to cause the furnace temperature reaching the safety temperature if the combustion amount maintained for a certain time. Thereby, the reduction of the combustion amount in total though the whole heating furnace with respect to the decreasing of surplus time T is suppressed, so as to minimize the decreasing of the conveying speed for the strip material 4.
  • the slope S may be maintained in positive even if the preset temperature is lower than the safety temperature.
  • the profile is not limited to a straight like shape, and may be also defined as a curved line.
  • the preset times Ts for all of the combustion segments are set at a same value, the controls of the burners 8 for all of the combustion segment are switched from the normal PID control to the control based on the surplus time Ts all together at a moment, and therefore the switching of the control is easier.
  • the preset times Ts may be set at different values from one combustion segment to another. Specifically, as shown in Fig. 5 , the preset time Ts preferably is set at longer time as larger the difference between the preset temperature and the safety temperature of the respective combustion segment is. In this case, the slope S of the profile of the combustion amount ratios may be a same value for the all of the combustion segments.
  • the slopes S of the profile are preferably determined so that the actual variation rates of the combustion amount in the respective combustion segments will be same, so as to equalize following capabilities in the furnace temperatures with respect to the surplus time.
  • the combustion amount varies linearly to zero, in a case where the combustion amount is less than a lower limit value Rc corresponding to a lowest value of the combustion amount at which the combustion can be maintained in an actual burner 8, it is required to maintain the combustion amount at the lower limit value Rc or to completely shut down the combustion. If the combustion of the burner 8 is completely shut down, it needs much time and effort to ignite again. Therefore, when the combustion amount ratio according to the surplus time T is equal to or less than the lower limit value Rc, the combustion is maintained at the lower limit value Rc, and when the surplus time T has reached zero, the combustion of the burner 8 may be shut down completely simultaneously with setting the conveying speed for the strip material 4 in the heating furnace at zero.
  • the combustion amount ratio according to the surplus time T is equal to or less than the lower limit value Rc
  • the surplus time T is highly probable to reach zero in a short time, then the combustion of the burner 8 is completely shut down.
  • the surplus time T is possibly increasing, then the combustion of the burner 8 may be maintained at the slower limit value Rc.
  • a threshold value equal to or less than the lower limit value Rc may be defined to determine whether the combustion at the lower limit value Rc is maintained or the combustion is completely shut down, according to a magnitude relationship between the combustion amount ratio and the threshold value.
  • the present invention can be applied to a case where any other device is connected via the looper 2. Further, the present invention can be applied to a case where any other device is connected via looper downstream of the heating furnace. In a case where loopers are provided both upstream and downstream of the heating furnace, the surplus times may be calculated for both loopers so that, the combustion amount in the heating furnace is adjusted according to the shorter one of the two surplus time.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Thermal Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Heat Treatment Of Strip Materials And Filament Materials (AREA)
  • Control Of Heat Treatment Processes (AREA)
  • Regulation And Control Of Combustion (AREA)
EP12816425.8A 2012-07-06 2012-07-06 Continuous heating device Not-in-force EP2701121B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2012/067364 WO2014006749A1 (ja) 2012-07-06 2012-07-06 連続加熱装置

Publications (3)

Publication Number Publication Date
EP2701121A1 EP2701121A1 (en) 2014-02-26
EP2701121A4 EP2701121A4 (en) 2014-09-03
EP2701121B1 true EP2701121B1 (en) 2016-04-27

Family

ID=48481460

Family Applications (1)

Application Number Title Priority Date Filing Date
EP12816425.8A Not-in-force EP2701121B1 (en) 2012-07-06 2012-07-06 Continuous heating device

Country Status (5)

Country Link
EP (1) EP2701121B1 (ja)
JP (1) JP5189230B1 (ja)
CN (1) CN103764856B (ja)
ES (1) ES2571595T3 (ja)
WO (1) WO2014006749A1 (ja)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US12061047B2 (en) 2018-03-23 2024-08-13 Primetals Technologies Japan, Ltd. Operation support apparatus and operation support method for heat-treatment furnace, and a heat-treatment facility and operation method therefor

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2662484B2 (ja) * 1992-09-04 1997-10-15 新日本製鐵株式会社 ストリップ連続処理ラインの水平ルーパー装置
JP4640197B2 (ja) * 2006-02-06 2011-03-02 住友金属工業株式会社 鋼帯の処理方法及び処理設備
JP5386772B2 (ja) * 2006-04-27 2014-01-15 新日鐵住金株式会社 合金化溶融亜鉛メッキ鋼帯の製造方法
JP5510787B2 (ja) * 2009-10-13 2014-06-04 新日鐵住金株式会社 冷延鋼板の連続焼鈍設備の輻射加熱による加熱炉の板温度制御方法
JP5482249B2 (ja) * 2010-02-01 2014-05-07 新日鐵住金株式会社 連続焼鈍炉の板温制御装置および板温制御方法
CN102409155A (zh) * 2011-11-15 2012-04-11 江苏赛福天钢索股份有限公司 热处理炉温模糊控制系统

Also Published As

Publication number Publication date
EP2701121A4 (en) 2014-09-03
CN103764856A (zh) 2014-04-30
WO2014006749A1 (ja) 2014-01-09
EP2701121A1 (en) 2014-02-26
CN103764856B (zh) 2015-11-25
JPWO2014006749A1 (ja) 2016-06-02
JP5189230B1 (ja) 2013-04-24
ES2571595T3 (es) 2016-05-26

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