JP4979836B2 - Continuous annealing furnace - Google Patents

Description

  In the present invention, the treatment material introduced through the inlet seal portion is continuously conveyed from the heating zone to the cooling zone in the atmosphere gas containing hydrogen gas, and after the treatment material is indirectly heated in the heating zone, as described above. The present invention relates to a continuous annealing furnace in which a heated treatment material is cooled and cooled in a cooling zone and the annealed treatment material is led out through an outlet seal portion. In particular, in order to replenish the atmospheric gas leaked from the inlet seal portion and the outlet seal portion and to react the oxygen introduced into the continuous annealing furnace together with the treatment material with hydrogen gas, the atmospheric gas is used. When supplying atmospheric gas containing hydrogen gas from the supply device into the continuous annealing furnace, the excessive atmospheric gas supplied into the continuous annealing furnace is prevented from being discharged to the outside, and an excessive atmosphere is provided. It is characterized in that hydrogen gas contained in the gas is effectively used.

  Conventionally, when annealing a long treatment material such as a stainless steel strip obtained by cold rolling or the like in a continuous annealing furnace, bright annealing is performed so that the gloss of the surface of the treatment material is not impaired. Has been done.

  Then, in the case where the long treatment material is brightly annealed in the continuous annealing furnace as described above, as shown in FIG. 1, the long treatment material 1 is treated with an atmosphere gas containing hydrogen gas, generally hydrogen gas. It introduce | transduces through the inlet seal part 11 in the continuous annealing furnace 10 with which atmospheric gas which has nitrogen gas as a main component was filled, and this processing material 1 is indirectly heated by the heating zone 12 in the continuous annealing furnace 10, and is heated in this way. The treated material 1 is guided to the cooling zones 13a to 13c to be cooled, and further, the treated material 1 is guided from the top roll chamber 14 provided with the roller 14a to the outlet seal portion 16 through the chute 15 and passed through the outlet seal portion 16. Deriving from the continuous annealing furnace 10 is performed (see, for example, Patent Documents 1 and 2).

  Here, in such a continuous annealing furnace 10, the atmosphere gas leaked from the inlet seal portion 11 and the outlet seal portion 16 is replenished and introduced into the continuous annealing furnace 10 together with the treatment material 1. In order to treat oxygen by reacting with hydrogen gas contained in the atmospheric gas, an atmospheric gas containing hydrogen gas is supplied from the atmospheric gas supply device 20 into the continuous annealing furnace 10.

  When supplying the atmospheric gas containing hydrogen gas from the atmospheric gas supply device 20 to the continuous annealing furnace 10 as described above, generally, oxygen introduced into the continuous annealing furnace 10 together with the treatment material 1 is used as the atmospheric gas. The atmosphere gas is supplied excessively from the atmosphere gas supply device 20 into the continuous annealing furnace 10 in order to react with the hydrogen gas contained in the atmosphere.

  Here, when the atmospheric gas is excessively supplied from the atmospheric gas supply device 20 to the continuous annealing furnace 10 in this way, the pressure of the atmospheric gas in the continuous annealing furnace 10 gradually increases. It is necessary to discharge the atmospheric gas to the outside. In particular, in recent years, a highly airtight roll seal or the like has been used for the inlet seal portion 11 or the outlet seal portion 16 described above, and the amount of atmospheric gas that leaks from the inlet seal portion 11 or the outlet seal portion 16 is reduced. The amount of atmospheric gas discharged from the continuous annealing furnace 10 tends to increase.

  And, when discharging the atmospheric gas from the continuous annealing furnace 10 in this way, in order to prevent the hydrogen gas contained in the atmospheric gas from burning, the atmospheric gas is cooled or the atmospheric gas is diluted with air. There is a problem that the cost is high and the hydrogen gas contained in the excess atmosphere gas is wasted.

JP-A-3-134120 JP 7-268493 A

  In the present invention, the treatment material introduced through the inlet seal portion is continuously conveyed from the heating zone to the cooling zone in the atmosphere gas containing hydrogen gas, and after the treatment material is indirectly heated in the heating zone, as described above. It is an object to solve the above problems in a continuous annealing furnace in which the heated treatment material is cooled and cooled in a cooling zone, and the annealed treatment material is led out through the outlet seal portion. is there.

  That is, in the present invention, the atmosphere gas leaked from the inlet seal portion and the outlet seal portion is replenished as described above, and oxygen introduced into the continuous annealing furnace together with the treatment material is reacted with hydrogen gas. In order to perform sufficient processing, when the above atmospheric gas is supplied from the atmospheric gas supply device into the continuous annealing furnace, excess atmospheric gas supplied into the continuous annealing furnace is discharged to the outside. An object of the present invention is to effectively use the hydrogen gas contained in the excess atmospheric gas while suppressing it.

  In the present invention, in order to solve the problems as described above, an inlet seal portion for introducing a long treatment material, a heating zone for indirectly heating the treatment material by combustion in the combustion portion, and a heated treatment material are provided. A cooling zone for cooling and an outlet seal portion for leading out the cooled treatment material, and the treatment material introduced through the inlet seal portion is transferred from the heating zone to the cooling zone in an atmospheric gas containing hydrogen gas. In a continuous annealing furnace that continuously conveys and anneals and anneals the treated material through the outlet seal portion, an atmospheric gas supply device that supplies the atmospheric gas into the continuous annealing furnace, and a continuous annealing furnace A guide path for guiding excess atmosphere gas in the heating zone to the combustion section of the heating zone, and an atmosphere gas control device for controlling the introduction of excess atmosphere gas to the combustion section of the heating zone through the guide path; Provided.

  Here, in the continuous annealing furnace, as the heating zone for indirectly heating the treatment material, an outer tube is provided on the outer peripheral side of the inner tube through which the treatment material is passed, and combustion between the inner tube and the outer tube is performed. A so-called muffle type can be used.

  Further, when combustion is performed in the combustion section between the inner tube and the outer tube, a combustion device such as a burner can be provided in the outer tube.

  In the above-mentioned continuous annealing furnace, when the atmosphere gas temperature is very high when the excess atmosphere gas in the continuous annealing furnace is guided to the combustion zone of the heating zone by the atmosphere gas control device through the guide passage, Due to the heat resistance of the atmosphere, it becomes difficult to introduce the atmospheric gas to the combustion zone of the heating zone. Therefore, the excess atmospheric gas should be led to the combustion zone of the heating zone from the cooling zone where the atmospheric gas has been cooled to some extent. It is preferable.

  In addition, when introducing excess atmospheric gas from the continuous annealing furnace through the guide path to the combustion section of the heating zone as described above, the hydrogen gas contained in the atmospheric gas is appropriately burned and consumed in the combustion section. Therefore, in the above atmospheric gas control device, when the temperature of the combustion part is equal to or higher than the ignition temperature of hydrogen gas, it is preferable to introduce excess atmospheric gas to the combustion part.

  In the continuous annealing furnace, a gas purification device for purifying the atmospheric gas, a purification guide channel for guiding excess atmospheric gas guided through the guide channel to the gas purification device, and the gas purification device It is preferable to provide a return path for returning the atmospheric gas purified by the above to the atmospheric gas supply device.

  In the continuous annealing furnace configured as described above, when the temperature of the combustion section is lower than the ignition temperature of the hydrogen gas, the atmosphere gas control device removes excess atmosphere gas guided through the guide path. The purified atmosphere gas can be guided to the gas purification apparatus through the purification guide path and returned to the atmospheric gas supply apparatus through the return path.

  In the continuous annealing furnace according to the present invention, as described above, excess atmosphere gas in the continuous annealing furnace is guided from the inside of the continuous annealing furnace to the combustion zone of the heating zone by the atmosphere gas control device. The hydrogen gas contained in the excess atmospheric gas is combusted in this combustion section.

  As a result, in the continuous annealing furnace in the present invention, the hydrogen gas contained in the excess atmosphere gas in the continuous annealing furnace is effectively utilized for combustion in the combustion section of the heating zone, and the excess atmosphere gas Exhaust from the inside of the continuous annealing furnace is suppressed, and there is no need to cool the atmospheric gas or dilute the atmospheric gas with air, thereby reducing costs.

  Further, in this continuous annealing furnace, as described above, the gas purifying apparatus, the purifying guide path for guiding excess atmospheric gas guided through the guiding path to the gas purifying apparatus, and the atmospheric gas purified by the gas purifying apparatus are When the temperature of the combustion section is lower than the ignition temperature of the hydrogen gas, excess atmospheric gas introduced through the guide passage is led to the gas purification device through the purification guide passage. When the purified atmosphere gas is returned to the atmosphere gas supply device through the return path, the excess atmosphere gas is effectively used even when the temperature of the combustion section is lower than the ignition temperature of the hydrogen gas. It becomes like this.

It is the schematic explanatory drawing which showed the example of the conventional continuous annealing furnace. It is the schematic explanatory drawing which showed the continuous annealing furnace which concerns on one Embodiment of this invention. It is the schematic explanatory drawing which showed the example of a change of the continuous annealing furnace which concerns on one Embodiment of this invention.

  Hereinafter, a continuous annealing furnace according to an embodiment of the present invention will be specifically described with reference to the accompanying drawings. The continuous annealing furnace according to the present invention is not limited to the one shown in the following embodiment, and can be implemented with appropriate modifications within a range not changing the gist of the invention.

  In this embodiment, as shown in FIG. 2, an elongated treatment material 1 such as a stainless steel strip obtained by cold rolling is applied to an atmosphere gas containing hydrogen gas through an inlet seal portion 11, generally hydrogen gas. And a continuous annealing furnace 10 filled with an atmospheric gas mainly composed of nitrogen gas.

  Here, in the said inlet seal part 11, in order to suppress that said atmospheric gas with which the inside of the continuous annealing furnace 10 was filled flows out outside, the roll seal | sticker 11a is used.

  In the continuous annealing furnace 10, the treatment material 1 guided through the inlet seal portion 11 as described above is indirectly heated in the heating zone 12.

  Here, when the treatment material 1 is indirectly heated in the heating zone 12 as described above, the heating zone 12 has a double tube structure, and the treatment material 1 passes through the inner tube 12 a of the heating zone 12. In addition, a combustion device 12c such as a burner is provided in the outer tube 12b, the combustion device 12c performs combustion in the combustion portion 12d between the inner tube 12a and the outer tube 12b, and passes through the inner tube 12a. 1 is indirectly heated.

  In the heating zone 12, the combustion exhaust gas combusted in the combustion section 12d is guided to the cooling device 12f through the exhaust gas pipe 12e. After the combustion exhaust gas is cooled by the cooling device 12f, the combustion exhaust gas is discharged into the exhaust gas. The tube 12e is discharged outside.

  Next, the processing material 1 heated in the heating zone 12 is sequentially guided to the first to third cooling zones 13a to 13c to be cooled, and the processing material 1 thus cooled is provided with a roller 14a. The processed material 1 is guided from the top roll chamber 14 through the chute 15 to the outlet seal portion 16, and the treated material 1 is led out from the continuous annealing furnace 10 through the outlet seal portion 16. I have to.

  Here, also in the outlet seal portion 16 described above, the roll seal 16a is used in order to prevent the atmospheric gas filled in the continuous annealing furnace 10 from flowing out to the outside.

  Also in the continuous annealing furnace 10 of this embodiment, the atmosphere gas leaked from the inlet seal portion 11 and the outlet seal portion 16 is replenished and introduced into the continuous annealing furnace 10 together with the treatment material 1. In order to sufficiently treat oxygen by reacting it with hydrogen gas contained in the atmospheric gas, the atmospheric gas containing hydrogen gas is excessively supplied into the continuous annealing furnace 10 from the atmospheric gas supply device 20. In addition, in the continuous annealing furnace 10 of this embodiment, when supplying atmospheric gas containing hydrogen gas from the atmospheric gas supply apparatus 20 into the continuous annealing furnace 10, said atmospheric gas is supplied to the 3rd cooling zone 13c. However, the position for supplying the atmospheric gas is not particularly limited.

  And in the continuous annealing furnace 10 of this embodiment, the excess atmospheric gas is supplied from the inside of the continuous annealing furnace 10 supplied with the excessive atmospheric gas by the atmospheric gas supply device 20 in this manner, and the combustion section 12d of the heating zone 12 is used. And an atmosphere gas control device 30 for controlling that excess atmosphere gas is guided to the combustion section 12d of the heating zone 12 through the guide tube 33.

  Here, in the above atmospheric gas control device 30, a pressure gauge 31 for measuring the pressure of the atmospheric gas in the continuous annealing furnace 10 is provided, and the pressure of the atmospheric gas in the continuous annealing furnace 10 measured by the pressure gauge 31. Is output to the control means 32.

  Further, in the atmospheric gas control device 30, a first valve 33 a and a second valve 33 b are provided in the guide pipe 33 that guides excess atmospheric gas in the continuous annealing furnace 10 to the combustion unit 12 d of the heating zone 12, A discharge pipe 34 for discharging atmospheric gas to the outside is connected to a portion of the guide pipe 33 between the first valve 33a and the second valve 33b, and a third valve 34a is provided in the discharge pipe 34 to control the above control. The means 32 controls the first valve 33a, the second valve 33b, and the third valve 34a.

  When the temperature of the combustion part 12d is equal to or higher than the ignition temperature of hydrogen gas, the pressure of the atmospheric gas in the continuous annealing furnace 10 measured by the pressure gauge 31 is set to a predetermined value. While the first valve 33 a and the second valve 33 b are opened by the control means 32, the third valve 34 a is closed, and excess atmosphere gas in the continuous annealing furnace 10 is passed through the guide tube 33 to the heating zone 12. To the combustion section 12d.

  The hydrogen gas contained in the atmospheric gas thus led to the combustion section 12d is combusted by the combustion device 12c and discharged to the outside together with the combustion exhaust gas through the exhaust gas pipe 12e.

  In this way, the atmospheric gas containing hydrogen gas in the continuous annealing furnace 10 is prevented from being discharged to the outside as it is, and the hydrogen gas contained in the discharged atmospheric gas is in the combustion section 12d of the heating zone 12. Effectively used for combustion.

  In addition, when the temperature of the combustion part 12d of the heating zone 12 is lower than the ignition temperature of hydrogen gas and combustion is not performed in the combustion part 12d, the control means 32 and the first valve 33a While the third valve 34a is opened, the second valve 33b is closed, and the atmospheric gas can be discharged from the discharge pipe 34 to the outside.

  In this embodiment, when the treatment material 1 is indirectly heated in the heating zone 12, the heating zone 12 has a double-pipe structure, and a combustion device 12c such as a burner is provided in the outer pipe 12b. Combustion is performed in the combustion section 12d between the inner pipe 12a and the outer pipe 12b by the device 12c, but a radiant tube (not shown) serving as a combustion section is provided on the outer peripheral side of the inner pipe 12a. It is also possible to introduce an atmospheric gas containing hydrogen gas (not shown).

  Further, in the continuous annealing furnace 10 in the above-described embodiment, although not shown, the atmosphere gas that flows out from the continuous annealing furnace 10 through the inlet seal portion 11 and the outlet seal portion 16 is heated. It is also possible to introduce the hydrogen gas contained in the atmospheric gas into the combustion section 12d and to burn it in the combustion section 12d.

  In the continuous annealing furnace 10 in the above-described embodiment, when the temperature of the combustion part 12d of the heating zone 12 is lower than the ignition temperature of the hydrogen gas and combustion is not performed in the combustion part 12d, the control means described above is used. While the first valve 33a and the third valve 34a are opened by 32, the second valve 33b is closed and the atmospheric gas is discharged from the discharge pipe 34 to the outside. In order to effectively use the atmospheric gas discharged to the outside, the continuous annealing furnace 10 can be configured as in the modified example shown in FIG.

  In the continuous annealing furnace 10 of this modified example, as shown in FIG. 3, the excess atmosphere gas is led to the guide pipe 33 that leads the excess atmosphere gas to the combustion section 12 d of the heating zone 12, and the excess atmosphere gas is led to the gas purification device 35. A purification guide pipe 36 is connected, a fourth valve 36a is provided in the purification guide pipe 36, and a return pipe 37 for returning the atmospheric gas purified by the gas purification apparatus 35 to the atmospheric gas supply apparatus 20 is provided. Provided.

  Here, in the continuous annealing furnace 10 of this modified example, when the temperature of the combustion part 12d of the heating zone 12 is lower than the ignition temperature of the hydrogen gas and combustion is not performed in the combustion part 12d, the above atmospheric gas control is performed. While the second valve 33b and the third valve 34a are closed by the control means 32 in the apparatus 30, the first valve 33a and the fourth valve 36a are opened, and excess atmosphere gas is removed from the purification guide pipe 36. To the gas purifier 35.

  The gas purifier 35 purifies the atmospheric gas by performing deoxygenation treatment or dehydration treatment on the introduced excess atmospheric gas, and converts the purified atmospheric gas to the above-mentioned return gas. It returns to the said atmospheric gas supply apparatus 20 through the pipe | tube 37, and refine | purified atmospheric gas is reused.

  If it does in this way, it will further suppress that atmospheric gas containing hydrogen gas in continuous annealing furnace 10 is discharged outside from the above-mentioned discharge pipe 34, and atmospheric gas comes to be used more effectively.

  Even when the temperature of the combustion part 12d is equal to or higher than the ignition temperature of the hydrogen gas and the excess atmospheric gas is guided to the combustion part 12d of the heating zone 12 through the guide tube 33 and burned, the combustion of the heating zone 12 In order to adjust the amount of excess atmospheric gas supplied to the part 12d, the fourth valve 36a is adjusted to introduce a part of the excess atmospheric gas supplied to the combustion part 12d to the gas purifier 35. It can be purified and returned to the atmospheric gas supply device 20.

DESCRIPTION OF SYMBOLS 1 Treatment material 10 Continuous annealing furnace 11 Inlet seal part 11a Roll seal 12 Heating zone 12a Inner pipe 12b Outer pipe 12c Combustion device 12d Combustion part 12e Exhaust gas pipe 12f Cooling device 13a-13c 1st-3rd cooling zone 14 Top roll chamber 14a roller 15 chute 16 outlet seal portion 16a roll seal 20 atmospheric gas supply device 30 atmospheric gas control device 31 pressure gauge 32 control means 33 guide pipe 33a first valve 33b second valve 34 discharge pipe 34a third valve 35 gas purification device 36 Guide pipe for purification 36a Fourth valve 37 Return pipe

Claims (7)

  An inlet seal portion for introducing a long treatment material, a heating zone for indirectly heating the treatment material by combustion in the combustion portion, a cooling zone for cooling the heated treatment material, and an outlet for deriving the cooled treatment material The treatment material introduced through the inlet seal portion is annealed by continuously transporting the treatment material introduced through the inlet seal portion from the heating zone to the cooling zone in the atmosphere gas containing hydrogen gas. In the continuous annealing furnace led out through the outlet seal part, the atmospheric gas supply device for supplying the atmospheric gas into the continuous annealing furnace, and the excess atmospheric gas in the continuous annealing furnace to the combustion part of the heating zone A continuous annealing furnace provided with a guiding path for guiding and an atmosphere gas control device for controlling that excess atmospheric gas is guided to the combustion section of the heating zone through the guiding path.   2. The continuous annealing furnace according to claim 1, wherein the heating zone is provided with an outer pipe on an outer peripheral side of the inner pipe through which the processing material passes, and combustion is performed in a combustion portion between the inner pipe and the outer pipe. A continuous annealing furnace characterized by being performed.   The continuous annealing furnace according to claim 2, wherein a combustion device is provided in the outer pipe.   The continuous annealing furnace according to any one of claims 1 to 3, wherein the guide path guides excess atmospheric gas from the cooling zone to a combustion portion of a heating zone. Furnace.   The continuous annealing furnace according to any one of claims 1 to 4, wherein the atmosphere gas control device generates excess atmosphere gas when the temperature of the combustion section is equal to or higher than an ignition temperature of hydrogen gas. A continuous annealing furnace characterized by being guided to the combustion section.   The continuous annealing furnace according to any one of claims 1 to 5, wherein the gas purifier purifies the atmospheric gas, and the purification that leads the excess atmospheric gas guided through the guide path to the gas purifier. A continuous annealing furnace, characterized in that a guide path and a return path for returning the atmospheric gas purified by the gas purification apparatus to the atmospheric gas supply apparatus are provided.   7. The continuous annealing furnace according to claim 6, wherein the atmospheric gas control device guides excess atmospheric gas to the gas purification device when the temperature of the combustion section is lower than the ignition temperature of hydrogen gas. Features a continuous annealing furnace.

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