EP2837700A1 - Method for lowering dew point of ambient gas within annealing furnace, device thereof, and method for producing cold-rolled annealed steel sheet - Google Patents
Method for lowering dew point of ambient gas within annealing furnace, device thereof, and method for producing cold-rolled annealed steel sheet Download PDFInfo
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- EP2837700A1 EP2837700A1 EP20130776255 EP13776255A EP2837700A1 EP 2837700 A1 EP2837700 A1 EP 2837700A1 EP 20130776255 EP20130776255 EP 20130776255 EP 13776255 A EP13776255 A EP 13776255A EP 2837700 A1 EP2837700 A1 EP 2837700A1
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- Prior art keywords
- gas
- temperature
- atmosphere
- zone
- dew point
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- 238000000137 annealing Methods 0.000 title claims description 41
- 238000000034 method Methods 0.000 title claims description 21
- 229910000831 Steel Inorganic materials 0.000 title claims description 15
- 239000010959 steel Substances 0.000 title claims description 15
- 238000004519 manufacturing process Methods 0.000 title claims description 5
- 238000010438 heat treatment Methods 0.000 claims abstract description 62
- 238000001816 cooling Methods 0.000 claims abstract description 55
- 238000002791 soaking Methods 0.000 claims abstract description 23
- 238000002156 mixing Methods 0.000 claims abstract description 6
- 229910052751 metal Inorganic materials 0.000 claims description 8
- 239000002184 metal Substances 0.000 claims description 8
- 230000003247 decreasing effect Effects 0.000 claims description 4
- 239000010960 cold rolled steel Substances 0.000 claims description 3
- 239000007789 gas Substances 0.000 description 157
- 238000001179 sorption measurement Methods 0.000 description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 7
- 238000007747 plating Methods 0.000 description 6
- 229910001297 Zn alloy Inorganic materials 0.000 description 5
- 239000011248 coating agent Substances 0.000 description 5
- 238000000576 coating method Methods 0.000 description 5
- 230000007547 defect Effects 0.000 description 5
- 238000007791 dehumidification Methods 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 4
- 229910021536 Zeolite Inorganic materials 0.000 description 3
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 description 3
- 239000010457 zeolite Substances 0.000 description 3
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 2
- 239000001110 calcium chloride Substances 0.000 description 2
- 229910001628 calcium chloride Inorganic materials 0.000 description 2
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 description 2
- 239000000292 calcium oxide Substances 0.000 description 2
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 2
- 239000002274 desiccant Substances 0.000 description 2
- 239000000741 silica gel Substances 0.000 description 2
- 229910002027 silica gel Inorganic materials 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- 238000011144 upstream manufacturing Methods 0.000 description 2
- 229910052725 zinc Inorganic materials 0.000 description 2
- 239000011701 zinc Substances 0.000 description 2
- YIWGJFPJRAEKMK-UHFFFAOYSA-N 1-(2H-benzotriazol-5-yl)-3-methyl-8-[2-[[3-(trifluoromethoxy)phenyl]methylamino]pyrimidine-5-carbonyl]-1,3,8-triazaspiro[4.5]decane-2,4-dione Chemical compound CN1C(=O)N(c2ccc3n[nH]nc3c2)C2(CCN(CC2)C(=O)c2cnc(NCc3cccc(OC(F)(F)F)c3)nc2)C1=O YIWGJFPJRAEKMK-UHFFFAOYSA-N 0.000 description 1
- JAWMENYCRQKKJY-UHFFFAOYSA-N [3-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-ylmethyl)-1-oxa-2,8-diazaspiro[4.5]dec-2-en-8-yl]-[2-[[3-(trifluoromethoxy)phenyl]methylamino]pyrimidin-5-yl]methanone Chemical compound N1N=NC=2CN(CCC=21)CC1=NOC2(C1)CCN(CC2)C(=O)C=1C=NC(=NC=1)NCC1=CC(=CC=C1)OC(F)(F)F JAWMENYCRQKKJY-UHFFFAOYSA-N 0.000 description 1
- KYKAJFCTULSVSH-UHFFFAOYSA-N chloro(fluoro)methane Chemical compound F[C]Cl KYKAJFCTULSVSH-UHFFFAOYSA-N 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- NRNCYVBFPDDJNE-UHFFFAOYSA-N pemoline Chemical compound O1C(N)=NC(=O)C1C1=CC=CC=C1 NRNCYVBFPDDJNE-UHFFFAOYSA-N 0.000 description 1
- 238000003887 surface segregation Methods 0.000 description 1
Images
Classifications
-
- 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.
- a method for supplying another atmosphere gas having a low dew point from the outside of a furnace to a heating zone or a soaking zone (see Patent Literature 1).
- Patent Literature 2 A method for providing a mechanism for circulating a furnace atmosphere gas in the outside of the furnace and thereby performing heat exchange between the circulating high-temperature atmosphere gas and a room-temperature atmosphere gas having a low dew point, which is to be supplied separately to the furnace (see Patent Literature 2).
- Patent Literature 3 A method for performing heat exchange between a high-temperature furnace atmosphere gas and an atmosphere gas having a dew point that has been reduced in the outside of a furnace and reducing the dew point with a water adsorption filter (see Patent Literature 3).
- 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)
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Abstract
Description
- 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.
- 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.
- A: A method for supplying another atmosphere gas having a low dew point from the outside of a furnace to a heating zone or a soaking zone (see Patent Literature 1).
- B: A method for providing a mechanism for circulating a furnace atmosphere gas in the outside of the furnace and thereby performing heat exchange between the circulating high-temperature atmosphere gas and a room-temperature atmosphere gas having a low dew point, which is to be supplied separately to the furnace (see Patent Literature 2).
- C: A method for performing heat exchange between a high-temperature furnace atmosphere gas and an atmosphere gas having a dew point that has been reduced in the outside of a furnace and reducing the dew point with a water adsorption filter (see Patent Literature 3).
-
- PTL 1: Japanese Unexamined Patent Application Publication No.
2002-3953 - PTL 2: Japanese Unexamined Patent Application Publication No.
62-290830 - PTL 3: Japanese Unexamined Patent Application Publication No.
11-124622 -
- NPL 1: Tetsu To Hagane (Bulletin of the Iron and Steel Institute of Japan), 96-1 (2010), pp. 11-20
- In accordance with the related art A, the low-temperature gas is directly introduced into the high-temperature furnace. Thus, 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.
- In accordance with the related art B, even when 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. Thus, the dew point of the atmosphere gas in the furnace cannot be sufficiently reduced.
- In accordance with the related art C, 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. Thus, 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. - As a result of extensive studies to solve the problems described above, 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.
- The present invention can be summarized as follows:
- (1)
A method for reducing the dew point of a furnace atmosphere gas in a continuous annealing furnace for annealing a metal strip in a reducing atmosphere by passing the metal strip through a heating zone and a cooling zone in this order or through a heating zone, a soaking zone, and a cooling zone in this order, including:- a step (a) for providing a circulator that includes a heat exchanger for heat exchange between a low-temperature gas and a high-temperature gas, a gas cooler for cooling a gas, and a dryer for dehumidifying a gas to a dew point of - 45°C or less;
- a step (b) for sucking part of the atmosphere gas from the heating zone and/or the soaking zone;
- then a step (c) for passing the sucked part of the atmosphere gas through a high-temperature gas passage of the heat exchanger and decreasing the temperature of the sucked part of the atmosphere gas by heat exchange with a gas in a low-temperature gas passage;
- then a step (d) for mixing the part of the atmosphere gas having a decreased temperature with part of an atmosphere gas sucked from the cooling zone to further decrease the temperature of the part of the atmosphere gas;
- then a step (e) for passing the part of the atmosphere gas further cooled by mixing with the part of the atmosphere gas sucked from the cooling zone through the gas cooler to further cooling the part of the atmosphere gas;
- then a step (f) for dehumidifying the part of the atmosphere gas further cooled through the gas cooler to a dew point of -45°C or less in the dryer;
- then a step (g) for passing the dehumidified part of the atmosphere gas through the low-temperature gas passage of the heat exchanger to increase the temperature of the dehumidified part of the atmosphere gas by heat exchange with a gas in the high-temperature gas passage; and
- then a step (h) for returning the part of the atmosphere gas having an increased temperature to the heating zone and/or the soaking zone.
- (2)
The method for reducing the dew point of an atmosphere gas in an annealing furnace according to (1), wherein the 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. - (3)
An apparatus for reducing the dew point of an atmosphere gas in a continuous annealing furnace for annealing a metal strip in a reducing atmosphere by passing the metal strip through aheating zone 1 and acooling zone 2 in this order or through a heating zone, a soaking zone, and a cooling zone in this order, comprising:- a gas passage including a
heat exchanger 9 for heat exchange between a low-temperature gas and a high-temperature gas, agas cooler 10 for cooling a gas, adryer 11 for dehumidifying a gas to a dew point of -45°C or less, and agas mixer 20, - wherein the apparatus includes
- a gas passage extending from the
heating zone 1 and/or the soaking zone through agas passage 15 to a high-temperature gas passage of theheat exchanger 9 and through thegas cooler 10 to thedryer 11, - a
gas passage 16 extending from thedryer 11 to a low-temperature gas passage of theheat exchanger 9 and from theheat exchanger 9 to the heating zone and/or the soaking zone, and - a
gas passage 19 extending from thecooling zone 2, thegas passage 19 being connected to a gas passage extending from thegas cooler 10 to thedryer 11 in thegas mixer 20.
- a gas passage including a
- (4)
The apparatus for reducing the dew point of an atmosphere gas in an annealing furnace according to (3), further comprising agas passage 17 for returning part of gas flowing from thedryer 11 toward the low-temperature gas passage of theheat exchanger 9 directly to the cooling zone through agas distributor 13 but without passing through theheat exchanger 9. - (5)
A method for producing a cold-rolled and annealed steel sheet, comprising continuously annealing a cold-rolled steel strip, wherein
the dew point of an atmosphere gas in the continuous annealing furnace according to (1) or (2) is reduced by the method for reducing the dew point of an atmosphere gas in an annealing furnace according to (1) or (2) during the continuous annealing. - In accordance with the present invention, 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. More preferably, 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. These can achieve a very low dew point of -45°C or less in the annealing furnace and significantly improve energy efficiency.
-
- [
Fig. 1] Fig. 1 is a schematic view of Conventional Example 1. - [
Fig. 2] Fig. 2 is a schematic view of Conventional Example 2. - [
Fig. 3] Fig. 3 is a schematic view of a circulation system according to Conventional Example 2. - [
Fig. 4] Fig. 4 is a schematic view of Conventional Example 3. - [
Fig. 5] Fig. 5 is a schematic view of a circulation system according to Conventional Example 3. - [
Fig. 6] Fig. 6 is a schematic view of Comparative Example 1. - [
Fig. 7] Fig. 7 is a schematic view of a circulation system according to Comparative Example 1. - [
Fig. 8] Fig. 8 is a schematic view of Example 1 of the present invention. - [
Fig. 9] Fig. 9 is a schematic view of a circulation system according to Example 1 of the present invention. - [
Fig. 10] Fig. 10 is a schematic view of Example 2 of the present invention. - [
Fig. 11] Fig. 11 is a schematic view of a circulation system according to Example 2 of the present invention. Description of Embodiments - When a cold-rolled steel strip is continuously annealed and is subsequently plated with zinc or a zinc alloy, the adhesion of plating depends greatly on the dew point in an annealing furnace. It is known that this results from the amount of Mn oxide on the surface of the steel strip. At a dew point in the vicinity of -10°C, Mn oxide is present within an oxide film on the surface of the steel strip and is rarely found on the surface of the steel strip. At a dew point of -45°C or less, Mn oxide is negligibly produced. At an intermediate dew point in the vicinity of -35°C (-15°C to -40°C), a large amount of Mn oxide is produced on the surface of the steel strip and inhibits the adhesion of plating. Thus, 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.
- Attention is now focused on the temperatures of an atmosphere gas sucked from the furnace into the circulator (hereinafter referred to as a sucked gas) and an atmosphere gas introduced from the circulator into the furnace (hereinafter referred to as an introduced gas). 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. Thus, if 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. Thus, 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.
- Furthermore, since 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.
- Unlike a water adsorption filter made of activated alumina, alternately operated and stopped, and having a low dehumidification capacity as described in
Patent Literature 3, 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 inPatent Literature 1. Atmospheregas supply equipment 12 directly supplies another low-temperature atmosphere gas to aheating zone 1 and acooling zone 2. -
Figs. 2 and3 illustrate Conventional Example 2 described inPatent Literature 2. A gas sucked from acooling zone 2 enters acirculator 8 through aflow path 15, passes through aheat exchanger 9 to heat a gas from atmospheregas supply equipment 12, and returns to thecooling zone 2 through aflow path 16. The low-temperature atmosphere gas supplied from thegas supply equipment 12 is heated in theheat exchanger 9 and is introduced into aheating zone 1 through anatmosphere gas pipe 7. -
Figs. 4 and 5 illustrate Conventional Example 3 described inPatent Literature 3. A gas sucked fromheating zone 1 is introduced into acirculator 8 through aflow path 15, is cooled in aheat exchanger 9 with a gas from awater adsorption filter 18, is dehumidified with thewater adsorption filter 18 made of activated alumina, is heated in theheat exchanger 9, and is returned to theheating zone 1 through aflow 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 aheating zone 1 is introduced into acirculator 8 through aflow path 15, is cooled in aheat exchanger 9 with a gas that has been dehumidified in adryer 11, is further cooled in agas cooler 10, is dehumidified in thedryer 11, is heated in theheat exchanger 9 with a gas from theheating zone 1, and is returned to theheating zone 1 through aflow 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 aheating zone 1 is introduced into acirculator 8 through aflow path 15, is cooled in aheat exchanger 9 with a dehumidified gas from a dryer, is mixed in amixer 20 with another gas sucked from acooling zone 2 through aflow path 19, is further cooled in a cooler 10, is dehumidified in adryer 11, is heated with a gas from theheating zone 1, and is returned to theheating zone 1 through aflow path 16. -
Figs. 10 and 11 illustrate Example 2 of the present invention and correspond to (2) and (4) in Solution to Problem. In addition to Example 1 of the present invention illustrated inFigs. 8 and 9 , the gas dehumidified in thedryer 11 is distributed with agas distributor 13. One part of the distributed gas is introduced into theheat exchanger 9, is heated therein with a gas from theheating zone 1 and is returned to theheating zone 1 through aflow path 16. The other part of the distributed gas is returned directly to acooling zone 2 through aflow path 17. - The conditions of these sucked gases and introduced gases were changed. 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. Furthermore, the dew points in the furnaces measured upstream from an
annealing furnace outlet 21 are also satisfactorily lower than -45°C. Furthermore, 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. - The adhesion of zinc alloy plating was examined in zinc alloy plating of a steel strip after continuous annealing in accordance with a JIS-H8504(g) tape test method (a chipping test method). As a result, Examples No. 1 to No. 6 had satisfactorily strong adhesion, but Conventional Examples No. 7 to No. 10 had coating defects.
[Table 1] No. Sucked gas Introduced gas Dew point in furnace measured upstream from continuous annealing furnace outlet (°C) Exhausted heat energy kJ/Nm3 Dehumidification method Adhesion of Zn alloy plating after continuous annealing Note Position Flow rate Nm3/Hr Temperature °C Dew point °C Position Flow rate Nm3/Hr Temperature °C Dew point °C 1 Heating zone 500 800 -20 Heating zone 750 600 -52 -50 68 Calcium oxide Strong Example 1 Cooling zone 250 50 -25 2 Heating zone 500 850 -25 Heating zone 1000 500 -55 -52 80 Zeolite Strong Example 1 Cooling zone 500 150 -15 3 Heating zone 1500 950 -25 Heating zone 2000 700 -60 -55 78 Silica gel Strong Example 1 Cooling zone 500 20 -15 4 Heating zone 1000 700 -10 Heating zone 1000 550 -50 -48 42 Zeolite Strong Example 2 Cooling zone 1000 200 -10 Cooling zone 1000 20 5 Heating zone 500 850 -25 Heating zone 250 600 -51 -49 35 Calcium chloride Strong Example 2 Cooling zone 1500 30 -15 Cooling zone 1750 25 6 Heating zone 2000 950 -15 Heating zone 1500 600 -70 -65 40 Compressor method Strong Example 2 Cooling zone 500 20 -25 Cooling zone 1000 5 7 Cooling zone 0 - - Cooling zone 3000 25 -50 -35 253 - Coating defect Conventional example 1 8 Heating zone 0 - - Heating zone 1500 5 -45 -32 402 - Coating defect Conventional example 1 9 Heating zone 500 950 -20 Heating zone 500 700 -20 -21 155 - Coating defect Conventional example 2 (250) 200 -40 10 Heating zone 4000 800 -15 Heating zone 4000 600 -35 -23 189 - Coating defect Conventional example 2 [Note] A flow rate in parentheses is the flow rate of another supplied gas. -
- 1
- Heating zone
- 2
- Cooling zone
- 3
- Steel strip
- 4
- Roller
- 5
- Suction port
- 6
- Inlet
- 7
- Atmosphere gas pipe
- 8
- Circulator
- 9
- Heat exchanger
- 10
- Gas cooler
- 11
- Dryer (dehumidifier)
- 12
- Equipment for supplying another atmosphere gas
- 13
- Gas distributor
- 15
- Gas flow path from heating zone
- 16
- Gas flow path to heating zone
- 17
- Gas flow path to cooling zone
- 18
- Water adsorption filter
- 19
- Gas flow path from cooling zone
- 20
- Gas mixer
- 21
- Annealing furnace outlet
Claims (5)
- A method for reducing the dew point of a furnace atmosphere gas in a continuous annealing furnace for annealing a metal strip in a reducing atmosphere by passing the metal strip through a heating zone and a cooling zone in this order or through a heating zone, a soaking zone, and a cooling zone in this order, comprising:a step (a) for providing a circulator that includes a heat exchanger for heat exchange between a low-temperature gas and a high-temperature gas, a gas cooler for cooling a gas, and a dryer for dehumidifying a gas to a dew point of - 45°C or less;a step (b) for sucking part of the atmosphere gas from the heating zone and/or the soaking zone;then a step (c) for passing the sucked part of the atmosphere gas through a high-temperature gas passage of the heat exchanger and decreasing the temperature of the sucked part of the atmosphere gas by heat exchange with a gas in a low-temperature gas passage;then a step (d) for mixing the part of the atmosphere gas having a decreased temperature with part of an atmosphere gas sucked from the cooling zone to further decrease the temperature of the part of the atmosphere gas;then a step (e) for passing the part of the atmosphere gas further cooled by mixing with the part of the atmosphere gas sucked from the cooling zone through the gas cooler to further cooling the part of the atmosphere gas;then a step (f) for dehumidifying the part of the atmosphere gas further cooled through the gas cooler to a dew point of -45°C or less in the dryer;then a step (g) for passing the dehumidified part of the atmosphere gas through the low-temperature gas passage of the heat exchanger to increase the temperature of the dehumidified part of the atmosphere gas by heat exchange with a gas in the high-temperature gas passage; andthen a step (h) for returning the part of the atmosphere gas having an increased temperature to the heating zone and/or the soaking zone.
- The method for reducing the dew point of an atmosphere gas in an annealing furnace according to Claim 1, wherein the 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.
- An apparatus for reducing the dew point of an atmosphere gas in a continuous annealing furnace for annealing a metal strip in a reducing atmosphere by passing the metal strip through a heating zone 1 and a cooling zone 2 in this order or through a heating zone, a soaking zone, and a cooling zone in this order, comprising:a gas passage including a heat exchanger 9 for heat exchange between a low-temperature gas and a high-temperature gas, a gas cooler 10 for cooling a gas, a dryer 11 for dehumidifying a gas to a dew point of -45°C or less, and a gas mixer 20,wherein the apparatus includesa gas passage extending from the heating zone 1 and/or the soaking zone through a gas passage 15 to a high-temperature gas passage of the heat exchanger 9 and through the gas cooler 10 to the dryer 11,a gas passage 16 extending from the dryer 11 to a low-temperature gas passage of the heat exchanger 9 and from the heat exchanger 9 to the heating zone and/or the soaking zone, anda gas passage 19 extending from the cooling zone 2, the gas passage 19 being connected to a gas passage extending from the gas cooler 10 to the dryer 11 in the gas mixer 20.
- The apparatus for reducing the dew point of an atmosphere gas in an annealing furnace according to Claim 3, further comprising a gas passage 17 for returning part of gas flowing from the dryer 11 toward the low-temperature gas passage of the heat exchanger 9 directly to the cooling zone through a gas distributor 13 but without passing through the heat exchanger 9.
- A method for producing a cold-rolled and annealed steel sheet, comprising continuously annealing a cold-rolled steel strip, wherein
the dew point of an atmosphere gas in a continuous annealing furnace is reduced by the method for reducing the dew point of an atmosphere gas in an annealing furnace according to Claim 1 or 2 during the continuous annealing.
Applications Claiming Priority (2)
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JP2012088089 | 2012-04-09 | ||
PCT/JP2013/002353 WO2013153791A1 (en) | 2012-04-09 | 2013-04-05 | Method for lowering dew point of ambient gas within annealing furnace, device thereof, and method for producing cold-rolled annealed steel sheet |
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EP2837700A1 true EP2837700A1 (en) | 2015-02-18 |
EP2837700A4 EP2837700A4 (en) | 2015-12-02 |
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Country Status (6)
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US (1) | US20150114528A1 (en) |
EP (1) | EP2837700B1 (en) |
JP (1) | JP5742950B2 (en) |
KR (1) | KR101564870B1 (en) |
CN (1) | CN104245972B (en) |
WO (1) | WO2013153791A1 (en) |
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CN104220610B (en) * | 2012-04-09 | 2017-08-08 | 杰富意钢铁株式会社 | The manufacture method of the dew point reduction method of atmosphere gas, its device and cold rolled annealed steel plate in annealing furnace |
IN2015DN03981A (en) * | 2012-12-04 | 2015-10-02 | Jfe Steel Corp | |
CN105018714B (en) * | 2014-04-17 | 2017-02-22 | 宝山钢铁股份有限公司 | Method for humidifying atmosphere in continuous annealing furnace |
JP6008007B2 (en) * | 2015-03-23 | 2016-10-19 | Jfeスチール株式会社 | Continuous hot dip galvanizing apparatus and method for producing hot dip galvanized steel sheet |
CN109990569B (en) * | 2019-04-09 | 2020-08-11 | 中冶赛迪工程技术股份有限公司 | Annealing furnace drying method based on cooling and dehumidifying |
JP7402372B1 (en) * | 2023-06-06 | 2023-12-20 | 日本碍子株式会社 | heat treatment furnace |
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DE1959713C2 (en) * | 1969-11-28 | 1975-11-27 | Fa. J. Aichelin, 7015 Korntal | PROCESS FOR CLEANING THE PROTECTIVE GAS ATMOSPHERES OF AN INDUSTRIAL FURNACE AND FOR CARRYING OUT THIS PROCESS OF EQUIPPED CONTINUOUS INDUSTRIAL FURNACES |
JPS62290830A (en) | 1986-06-11 | 1987-12-17 | Nisshin Steel Co Ltd | Continuous annealing method for steel strip and annealing furnace therefor |
JP2670134B2 (en) * | 1989-03-08 | 1997-10-29 | 川崎製鉄株式会社 | Atmosphere gas control method in vertical continuous bright annealing furnace for stainless steel strip |
JP2567113B2 (en) * | 1989-04-05 | 1996-12-25 | 日本冶金工業株式会社 | Bright annealing furnace |
JPH10176225A (en) * | 1996-12-13 | 1998-06-30 | Daido Steel Co Ltd | Continuous annealing furnace of metallic strip |
JPH11124622A (en) | 1997-10-21 | 1999-05-11 | Daido Steel Co Ltd | Heat treatment |
TW436526B (en) * | 1998-07-28 | 2001-05-28 | Kawasaki Steel Co | Box annealing furnace, method for annealing metal sheet using the same, and annealed metal sheet |
JP2000104123A (en) * | 1998-07-28 | 2000-04-11 | Kawasaki Steel Corp | Annealed metallic plate, production thereof and box annealing furnace |
JP4123690B2 (en) | 2000-06-20 | 2008-07-23 | 住友金属工業株式会社 | Method for supplying atmospheric gas into continuous annealing furnace |
DE102009006384A1 (en) * | 2009-01-28 | 2010-08-19 | Uhde Gmbh | Method for supplying an entrainment gasification reactor with fuel from a reservoir |
CN201660671U (en) * | 2010-04-21 | 2010-12-01 | 山西太钢不锈钢股份有限公司 | Device for reducing hydrogen dew points of annealing furnace |
JP5071551B2 (en) * | 2010-12-17 | 2012-11-14 | Jfeスチール株式会社 | Continuous annealing method for steel strip, hot dip galvanizing method |
CN104220610B (en) * | 2012-04-09 | 2017-08-08 | 杰富意钢铁株式会社 | The manufacture method of the dew point reduction method of atmosphere gas, its device and cold rolled annealed steel plate in annealing furnace |
-
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- 2013-04-05 JP JP2013534870A patent/JP5742950B2/en active Active
- 2013-04-05 US US14/391,022 patent/US20150114528A1/en not_active Abandoned
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- 2013-04-05 WO PCT/JP2013/002353 patent/WO2013153791A1/en active Application Filing
- 2013-04-05 KR KR1020147029899A patent/KR101564870B1/en active IP Right Grant
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JP5742950B2 (en) | 2015-07-01 |
JPWO2013153791A1 (en) | 2015-12-17 |
CN104245972A (en) | 2014-12-24 |
US20150114528A1 (en) | 2015-04-30 |
KR20140139590A (en) | 2014-12-05 |
EP2837700A4 (en) | 2015-12-02 |
KR101564870B1 (en) | 2015-10-30 |
WO2013153791A1 (en) | 2013-10-17 |
EP2837700B1 (en) | 2019-06-05 |
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