EP2837700B1 - Method for lowering dew point of atmosphere gas within annealing furnace, device thereof, and method for producing cold-rolled annealed steel sheet - Google Patents

Method for lowering dew point of atmosphere gas within annealing furnace, device thereof, and method for producing cold-rolled annealed steel sheet Download PDF

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Publication number
EP2837700B1
EP2837700B1 EP13776255.5A EP13776255A EP2837700B1 EP 2837700 B1 EP2837700 B1 EP 2837700B1 EP 13776255 A EP13776255 A EP 13776255A EP 2837700 B1 EP2837700 B1 EP 2837700B1
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EP
European Patent Office
Prior art keywords
gas
temperature
atmosphere
zone
dew point
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EP13776255.5A
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German (de)
English (en)
French (fr)
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EP2837700A1 (en
EP2837700A4 (en
Inventor
Takamasa Fujii
Masato Iri
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JFE Steel Corp
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JFE Steel Corp
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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
    • 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
    • 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
    • F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
    • F27D17/004—Systems for reclaiming waste heat
    • 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
    • F27D7/00—Forming, maintaining, or circulating atmospheres in heating chambers
    • F27D7/06—Forming or maintaining special atmospheres or vacuum within heating chambers
    • F27D2007/063—Special atmospheres, e.g. high pressure atmospheres

Definitions

  • the present invention belongs to the field of advantageous production of a steel strip that can reduce the dew point of an atmosphere gas in a continuous annealing furnace and has high wettability and, in particular, relates to a method for reducing the dew point of an atmosphere gas in an annealing furnace, an apparatus for the method, and a method for producing a cold-rolled and annealed steel sheet.
  • Non Patent Literature 1 It is known that when the dew point of an atmosphere gas in a continuous annealing furnace is -45°C or less, surface segregation of Mn during annealing can be suppressed, and the adhesion of zinc or zinc alloy plating after annealing is improved (see Non Patent Literature 1).
  • the following are examples of a method in the related art for reducing the dew point of an atmosphere gas in a continuous annealing furnace.
  • NPL 1 Tetsu To Hagane (Bulletin of the Iron and Steel Institute of Japan), 96-1 (2010), pp. 11-20
  • the low-temperature gas is directly introduced into the high-temperature furnace.
  • a large amount of thermal energy is required to maintain the steel strip temperature in the furnace, the gas temperature cannot be controlled, and the energy efficiency is very low.
  • the low-temperature gas has a low dew point
  • the low-temperature gas is mixed with a large amount of atmosphere gas having a high dew point in the furnace.
  • the dew point of the atmosphere gas in the furnace cannot be sufficiently reduced.
  • the temperature of a gas to be returned to the furnace is not sufficiently increased and, as described in Patent Literature 3, the water adsorption filter having a low dehumidification capacity reduces the dew point only to approximately -30°C and cannot reduce the dew point to -45°C or less, which is a target of the present application.
  • known techniques for reducing the dew point of the atmosphere of a continuous annealing furnace have problems that they cannot achieve a low dew point of -45°C or less and that they have very low energy efficiency.
  • the present inventors completed the present invention by considering means for installing a dryer, for example, of a desiccant method or a compressor method that allows a dew point of -45°C or less in order to reduce the dew point of an annealing furnace atmosphere gas and a circulator to reduce the dew point to -45°C, installing a heat exchanger in the circulator to increase or decrease the temperature of the gas, and modifying a gas inflow (gas introduction) into a heating zone and a cooling zone of the furnace to improve energy efficiency.
  • a dryer for example, of a desiccant method or a compressor method that allows a dew point of -45°C or less in order to reduce the dew point of an annealing furnace atmosphere gas and a circulator to reduce the dew point to -45°C
  • installing a heat exchanger in the circulator to increase or decrease the temperature of the gas
  • modifying a gas inflow (gas introduction) into a heating zone and a cooling zone of the furnace to improve energy efficiency
  • the present invention can be summarized as follows:
  • part of an atmosphere gas in the heating zone and/or the soaking zone is sucked out and is cooled through a high-temperature gas passage of the heat exchanger by heat exchange with a gas in a low-temperature gas passage, is then further cooled by mixing with part of an atmosphere gas of the cooling zone, is then further cooled through the gas cooler, is then dehumidified to a dew point of -45°C or less in the dryer, is then heated through the low-temperature gas passage of the heat exchanger by heat exchange with a gas in the high-temperature gas passage, and is returned to the heating zone and/or the soaking zone.
  • part of gas flowing from the dryer toward the low-temperature gas passage of the heat exchanger is returned directly to the cooling zone without passing through the heat exchanger.
  • the present inventors considered providing the annealing furnace with a circulator equipped with a dryer that allows a dew point of -45°C or less in order to achieve a very low dew point to prevent concentration of Mn oxide on the surface of the steel strip.
  • the desired atmosphere gas temperature in the annealing furnace is different in a heating zone, a soaking zone, and a cooling zone. More specifically, the sucked gas is cooled to approximately room temperature in a gas cooler before entering the dryer, is dehumidified in the dryer, and is returned to the furnace.
  • a low-temperature gas is directly introduced into a high-temperature region, such as the heating zone or the soaking zone, a high temperature required for annealing the steel strip cannot be maintained. For this reason, the temperature of the introduced gas from the circulator must be increased.
  • the present inventors employed a method for installing a heat exchanger between the furnace and the gas cooler. More specifically, a high-temperature gas sucked from the heating zone or the soaking zone of the furnace (sucked gas) is cooled in the cooler before entering the dryer. Utilizing thermal energy resulting from the temperature difference, therefore, the gas cooled in the gas cooler and dehumidified in the dryer can be heated. Thus, thermal energy discharged from the gas cooler can be effectively utilized.
  • a high-temperature gas sucked from the heating zone or the soaking zone of the furnace is passed through the heat exchanger, is cooled in the gas cooler, is dehumidified in the dryer, is heated in the heat exchanger, and is then returned to the heating zone or the soaking zone of the furnace.
  • the temperature of the high-temperature gas sucked from the heating zone or the soaking zone after the heat exchange is sometimes higher than the gas temperature in the cooling zone.
  • the gas after the heat exchange can advantageously be mixed with a low-temperature gas sucked from the cooling zone to reduce energy required to further cool the gas in the downstream gas cooler.
  • the gas temperature after cooling with the gas cooler is lower than the temperature of the cooling zone of the furnace, part of gas cooled in the gas cooler, dehumidified in the dryer, and returned directly to the cooling zone without passing through the heat exchanger can reduce the temperature and the dew point of the cooling zone, thus further improving energy efficiency.
  • a dryer for use in the present invention preferably has a high dehumidification capacity, for example, of a desiccant method for continuous dehumidification using calcium oxide, zeolite, silica gel, or calcium chloride or a compressor method using an alternative chlorofluorocarbon.
  • Figs. 1 to 11 illustrate the structure and gas passages of a continuous annealing furnace having a heating zone and a cooling zone according to Examples, Comparative Example, and Conventional Examples.
  • Fig. 1 illustrates Conventional Example 1 described in Patent Literature 1.
  • Atmosphere gas supply equipment 12 directly supplies another low-temperature atmosphere gas to a heating zone 1 and a cooling zone 2.
  • FIGs. 2 and 3 illustrate Conventional Example 2 described in Patent Literature 2.
  • a gas sucked from a cooling zone 2 enters a circulator 8 through a flow path 15, passes through a heat exchanger 9 to heat a gas from atmosphere gas supply equipment 12, and returns to the cooling zone 2 through a flow path 16.
  • the low-temperature atmosphere gas supplied from the gas supply equipment 12 is heated in the heat exchanger 9 and is introduced into a heating zone 1 through an atmosphere gas pipe 7.
  • FIGs. 4 and 5 illustrate Conventional Example 3 described in Patent Literature 3.
  • a gas sucked from heating zone 1 is introduced into a circulator 8 through a flow path 15, is cooled in a heat exchanger 9 with a gas from a water adsorption filter 18, is dehumidified with the water adsorption filter 18 made of activated alumina, is heated in the heat exchanger 9, and is returned to the heating zone 1 through a flow path 16.
  • Each apparatus includes three water adsorption filters 18, which are alternately operated at intervals of three hours.
  • FIGs. 6 and 7 illustrate Comparative Example 1.
  • a gas sucked from a heating zone 1 is introduced into a circulator 8 through a flow path 15, is cooled in a heat exchanger 9 with a gas that has been dehumidified in a dryer 11, is further cooled in a gas cooler 10, is dehumidified in the dryer 11, is heated in the heat exchanger 9 with a gas from the heating zone 1, and is returned to the heating zone 1 through a flow path 16.
  • FIGs. 8 and 9 illustrate Example 1 of the present invention and correspond to (1) and (3) in Solution to Problem.
  • a gas sucked from a heating zone 1 is introduced into a circulator 8 through a flow path 15, is cooled in a heat exchanger 9 with a dehumidified gas from a dryer, is mixed in a mixer 20 with another gas sucked from a cooling zone 2 through a flow path 19, is further cooled in a cooler 10, is dehumidified in a dryer 11, is heated with a gas from the heating zone 1, and is returned to the heating zone 1 through a flow path 16.
  • Figs. 10 and 11 illustrate Example 2 of the present invention and correspond to (2) and (4) in Solution to Problem.
  • the gas dehumidified in the dryer 11 is distributed with a gas distributor 13.
  • One part of the distributed gas is introduced into the heat exchanger 9, is heated therein with a gas from the heating zone 1 and is returned to the heating zone 1 through a flow path 16.
  • the other part of the distributed gas is returned directly to a cooling zone 2 through a flow path 17.
  • Table 1 shows the dew points of the sucked gases and the dew points of the introduced gases passing through the gas passages and exhausted heat energy during the passage in Examples and Conventional Examples.
  • Table 1 shows that the dew points of the gases introduced into the annealing furnaces in No. 1 to No. 3 of Example 1 and No. 4 to No. 6 of Example 2 are satisfactorily lower than the target temperature of -45°C, as compared with Conventional Examples No. 7 to No. 10.
  • the dew points in the furnaces measured upstream from an annealing furnace outlet 21 are also satisfactorily lower than -45°C.
  • No. 1 to No. 3 of Example 1 and No. 4 to No. 6 of Example 2 exhausted less heat energy and have very high energy efficiency.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Environmental & Geological Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Heat Treatment Of Strip Materials And Filament Materials (AREA)
EP13776255.5A 2012-04-09 2013-04-05 Method for lowering dew point of atmosphere gas within annealing furnace, device thereof, and method for producing cold-rolled annealed steel sheet Active EP2837700B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2012088089 2012-04-09
PCT/JP2013/002353 WO2013153791A1 (ja) 2012-04-09 2013-04-05 焼鈍炉内雰囲気ガスの露点低減方法、その装置及び冷延焼鈍鋼板の製造方法

Publications (3)

Publication Number Publication Date
EP2837700A1 EP2837700A1 (en) 2015-02-18
EP2837700A4 EP2837700A4 (en) 2015-12-02
EP2837700B1 true EP2837700B1 (en) 2019-06-05

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EP13776255.5A Active EP2837700B1 (en) 2012-04-09 2013-04-05 Method for lowering dew point of atmosphere gas within annealing furnace, device thereof, and method for producing cold-rolled annealed steel sheet

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US (1) US20150114528A1 (ja)
EP (1) EP2837700B1 (ja)
JP (1) JP5742950B2 (ja)
KR (1) KR101564870B1 (ja)
CN (1) CN104245972B (ja)
WO (1) WO2013153791A1 (ja)

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CN104220610B (zh) * 2012-04-09 2017-08-08 杰富意钢铁株式会社 退火炉炉内气氛气体的露点降低方法、其装置及冷轧退火钢板的制造方法
KR20150084051A (ko) * 2012-12-04 2015-07-21 제이에프이 스틸 가부시키가이샤 연속 용융 아연도금 강판의 제조 설비 및 제조 방법
CN105018714B (zh) * 2014-04-17 2017-02-22 宝山钢铁股份有限公司 连续退火炉内气氛增湿方法
JP6008007B2 (ja) * 2015-03-23 2016-10-19 Ｊｆｅスチール株式会社 連続溶融亜鉛めっき装置及び溶融亜鉛めっき鋼板の製造方法
CN109990569B (zh) * 2019-04-09 2020-08-11 中冶赛迪工程技术股份有限公司 一种基于降温除湿的退火炉烘干方法
JP7402372B1 (ja) 2023-06-06 2023-12-20 日本碍子株式会社 熱処理炉

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Publication number Publication date
CN104245972B (zh) 2016-03-16
KR101564870B1 (ko) 2015-10-30
JP5742950B2 (ja) 2015-07-01
KR20140139590A (ko) 2014-12-05
JPWO2013153791A1 (ja) 2015-12-17
WO2013153791A1 (ja) 2013-10-17
EP2837700A1 (en) 2015-02-18
EP2837700A4 (en) 2015-12-02
CN104245972A (zh) 2014-12-24
US20150114528A1 (en) 2015-04-30

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