JP7184473B1 - Continuous annealing furnace - Google Patents

Abstract

An object of the present invention is to safely exhaust atmospheric gas containing hydrogen gas from the furnace through an exhaust pipe when the pressure of the atmospheric gas containing hydrogen gas is increased in the furnace of a continuous annealing furnace. SOLUTION: A long material to be treated 1 is introduced into a furnace 10 filled with an atmosphere gas containing hydrogen gas, heated in a heating zone 12 in the furnace, cooled in a cooling zone 13, and annealed. In the continuous annealing furnace, an atmosphere gas guide pipe 31 is provided to guide the atmosphere gas containing hydrogen gas in the furnace to the liquid tank 30 containing the liquid w, and an exhaust pipe 32 is provided to exhaust the gas in the upper part of the liquid tank. The inert gas is supplied to the upper part of the liquid tank through the inert gas supply pipe 33 before the atmosphere gas containing hydrogen gas is led from the furnace to the upper part of the liquid tank through the atmosphere gas guide pipe and the liquid. Then, the air in the upper part of the liquid bath is exhausted through the exhaust pipe. [Selection diagram] Fig. 2

Description

In the present invention, a long treatment material is introduced into a furnace filled with an atmosphere gas containing hydrogen gas through an inlet seal, and the treatment material is heated in a heating zone in the furnace. The present invention relates to a continuous annealing furnace that cools and anneals treated materials in a cooling zone. In particular, when the pressure of the atmospheric gas containing hydrogen gas increases in the furnace, when the atmospheric gas containing hydrogen gas is exhausted from the furnace through the exhaust pipe, the gas atmosphere containing hydrogen gas can be safely discharged. It is characterized by the fact that

Conventionally, a long processed material such as a stainless steel strip obtained by cold rolling or the like is introduced into a continuous annealing furnace and continuously annealed.

Here, as such a continuous annealing furnace, as shown in Patent Document 1 and the like, an atmosphere gas containing hydrogen gas (generally, hydrogen gas and nitrogen gas are main components ) is introduced into a furnace filled with the material through the inlet seal, the treated material is heated in the heating zone in the furnace, and the heated treated material is cooled in the cooling zone and annealed. It has been known.

In such a continuous annealing furnace, hydrogen gas is supplied to replenish the atmospheric gas leaking from the inlet seal portion or the like, and to treat the material to be treated by reacting with the hydrogen gas contained in the atmospheric gas. Atmospheric gas containing the gas is stably supplied into the furnace.

Here, when the atmosphere gas containing hydrogen gas is stably supplied into the furnace in this way, when the pressure of the atmosphere gas in the furnace rises, the atmosphere gas containing hydrogen gas in the furnace is exhausted from the furnace. However, if the atmospheric gas containing hydrogen gas is directly discharged to the outside through the exhaust pipe, the hydrogen gas contained in the atmospheric gas may come into contact with air and explode.

For this reason, in the continuous annealing furnace shown in Patent Document 1, the atmosphere gas containing hydrogen gas in the furnace is purified and circulated in the furnace so as to reduce the amount of the atmosphere gas discharged to the outside through the exhaust pipe. It is also proposed to cool or dilute the atmosphere gas discharged to the outside.

Conventionally, as shown in Patent Documents 2 and 3, a pipe on the control pressure side is inserted into a liquid tank containing liquid, and the pressure of the gas in the pipe is controlled by the liquid pressure. A water seal that, when the gas pressure rises, exhausts the gas, which has been guided to the upper part of the liquid tank through the liquid contained in the liquid tank, to the outside through an exhaust pipe provided at the upper part of the liquid tank. Type cutouts are known.

In the continuous annealing furnace disclosed in Patent Document 1, it is conceivable to provide a water-sealed safety device as described above in order to discharge atmospheric gas containing hydrogen gas in the furnace to the outside.

Here, in the case where a water-sealed safety device as described above is provided in the portion where the atmosphere gas containing hydrogen gas in the furnace is discharged to the outside, the pressure of the atmosphere gas in the furnace rises to a predetermined pressure or higher as described above. Then, the atmospheric gas containing hydrogen gas in the furnace is led to the upper part of the liquid tank through the liquid contained in the liquid tank, and the atmospheric gas containing hydrogen gas is discharged to the outside through the exhaust pipe provided at the upper part of the liquid tank. will be exhausted.

However, since the exhaust pipe is open to the outside air, before the ambient gas containing hydrogen gas is exhausted to the outside through the exhaust pipe provided above the liquid tank, air from the outside must pass through the exhaust pipe. In this state, when the atmosphere gas containing hydrogen gas is led to the upper part of the liquid tank through the liquid contained in the liquid tank, the air accumulated in the upper part of the liquid tank There is a risk of explosion when mixed with

Japanese Patent No. 4979836 Japanese Utility Model Laid-Open No. 58-151795 Japanese Utility Model Laid-Open No. 58-151796

In the present invention, a long treatment material is introduced into a furnace filled with an atmosphere gas containing hydrogen gas through an inlet seal, and the treatment material is heated in a heating zone in the furnace. An object of the present invention is to solve the above-mentioned problems in a continuous annealing furnace in which the treated material is cooled and annealed in a cooling zone.

That is, in the continuous annealing furnace of the present invention, when the pressure of the atmosphere gas containing hydrogen gas is increased in the furnace as described above, the atmosphere gas containing hydrogen gas is exhausted from the furnace through the exhaust pipe. The object of the present invention is to make it possible to safely exhaust atmospheric gas containing hydrogen gas.

In the continuous annealing furnace according to the present invention, in order to solve the above problems, a long material to be treated is introduced through an inlet seal into a furnace filled with an atmospheric gas containing hydrogen gas, and In a continuous annealing furnace in which a material to be treated is heated in a heating zone in the furnace and cooled in a cooling zone to be annealed, the atmosphere gas containing hydrogen gas in the furnace is replaced by a liquid containing a liquid. An atmosphere gas guide pipe leading to the tank is provided, and an exhaust pipe is provided for exhausting the gas in the upper part of the liquid tank, so that the atmosphere gas containing hydrogen gas is discharged from the furnace through the atmosphere gas guide pipe and the liquid. An inert gas was supplied to the upper part of the liquid tank before it was led to the upper part of the tank, so that the air in the upper part of the liquid tank was exhausted through the exhaust pipe.

Then, like the continuous annealing furnace according to the present invention, an atmosphere gas guide pipe is provided to guide the atmosphere gas containing hydrogen gas in the furnace to the liquid tank containing the liquid, and the gas in the upper part of the liquid tank is diverted. An exhaust pipe for exhausting is provided, and before the atmosphere gas containing hydrogen gas is led from the inside of the furnace to the upper part of the liquid tank through the atmosphere gas guide pipe and the liquid, an inert gas is introduced into the upper part of the liquid tank. is supplied to evacuate the air in the upper part of the liquid tank through the exhaust pipe. Since the air in the upper part of the inside is exhausted by the inert gas, the atmospheric gas containing hydrogen gas is not mixed with the air and explodes.

Here, in the continuous annealing furnace according to the present invention, before the atmosphere gas containing hydrogen gas is introduced from the inside of the furnace to the upper part of the liquid tank through the atmosphere gas guide pipe and the liquid, as described above, In order to supply an inert gas to the upper part and exhaust the air in the upper part of the liquid tank through the exhaust pipe, an inert gas supply pipe is provided to supply the inert gas to the upper part of the liquid tank, The inert gas supply pipe is provided with a control valve for controlling the supply and stop of the inert gas to the upper part of the liquid tank, and a pressure detection device for detecting the pressure in the furnace, A control device is provided for controlling the control valve based on the pressure detected by the detection device, and the atmosphere gas containing hydrogen gas is introduced from the inside of the furnace to the upper part of the liquid tank through the atmosphere gas guide pipe and the liquid. Before the liquid tank is discharged, the control device opens the control valve to supply the inert gas from the inert gas supply pipe to the upper part of the liquid tank, and the air in the upper part of the liquid tank is exhausted. It can be vented through a tube.

Further, in the continuous annealing furnace according to the present invention, a second inert gas supply pipe for supplying inert gas into the furnace is provided, and the second inert gas supply pipe is connected to the inert gas into the furnace. A second control valve is provided to control the supply and stop of the active gas, and when the pressure detection device detects a sudden decrease in the pressure in the furnace, the control device controls the flow of hydrogen gas into the furnace. stopping the supply of the atmosphere gas containing can be done.

In the continuous annealing furnace, the pressure in the furnace to which the inert gas is supplied from the second inert gas supply pipe as described above is detected by the pressure detection device, and the pressure is detected by the pressure detection device. Based on the pressure, the control valve is opened by the control device before the atmosphere gas containing hydrogen gas is led from the furnace through the atmosphere gas guide pipe and the liquid to the upper part of the liquid tank. The inert gas can be supplied to the upper part of the liquid tank from the inert gas supply pipe, and the air in the upper part of the liquid tank can be exhausted through the exhaust pipe. In this way, the inert gas is supplied into the furnace from the second inert gas supply pipe, the pressure in the furnace rises, and the atmospheric gas containing hydrogen gas is led from the inside of the furnace to the upper part of the liquid tank. Even in this case, since the air in the upper part of the liquid tank is exhausted by the inert gas as described above, the atmosphere gas containing hydrogen gas is not mixed with the air and explodes.

Like the continuous annealing furnace of the present invention, an atmosphere gas guide pipe is provided to guide the atmosphere gas containing hydrogen gas in the furnace to the liquid tank containing the liquid, and an exhaust for exhausting the gas in the upper part of the liquid tank. A pipe is provided to supply an inert gas to the upper part of the liquid tank before the atmosphere gas containing hydrogen gas is led from the furnace to the upper part of the liquid tank through the atmosphere gas guide pipe and the liquid. When the air in the upper part of the liquid tank is exhausted through the exhaust pipe, even if the pressure in the furnace increases and the atmospheric gas containing hydrogen gas is led to the upper part of the liquid tank, Since the air in the upper part of the is exhausted by the inert gas, the atmospheric gas containing hydrogen gas is not mixed with the air and explodes.

As a result, in the continuous annealing furnace of the present invention, when the pressure of the atmosphere gas containing hydrogen gas increases in the furnace as described above, the atmosphere gas containing hydrogen gas is exhausted from the furnace through the exhaust pipe. Therefore, it becomes possible to safely exhaust atmospheric gas containing hydrogen gas.

BRIEF DESCRIPTION OF THE DRAWINGS It is the schematic explanatory drawing which showed the continuous annealing furnace which concerns on embodiment of this invention. In the continuous annealing furnace according to the above embodiment, before the atmosphere gas containing hydrogen gas is led from the furnace to the upper part of the liquid tank, an inert gas is supplied to the upper part of the liquid tank to FIG. 4 is a schematic explanatory diagram showing a state in which air in the upper portion is exhausted through an exhaust pipe; In the modification of the continuous annealing furnace according to the above embodiment, a second control valve is provided in the second inert gas supply pipe for supplying the inert gas into the furnace to control the supply and stop of the inert gas into the furnace. It is a schematic explanatory drawing showing the structure which carries out. In the continuous annealing furnace according to the modification, the supply of the atmosphere gas containing hydrogen gas into the furnace is stopped, and the inert gas is supplied into the furnace from the second inert gas supply pipe, and the hydrogen gas Inert gas is supplied to the upper part of the liquid tank before the atmosphere gas containing It is a schematic explanatory drawing.

BEST MODE FOR CARRYING OUT THE INVENTION A continuous annealing furnace according to an embodiment of the present invention will be specifically described below with reference to the accompanying drawings. It should be noted that the continuous annealing furnace according to the present invention is not limited to those shown in the following embodiments, and can be modified appropriately without changing the gist of the invention.

In the continuous annealing furnace of this embodiment, as shown in FIGS. 1 and 2, a long material 1 to be treated, such as a stainless steel strip obtained by cold rolling, is passed through an inlet seal portion 11 to contain hydrogen gas. Atmospheric gas (usually containing hydrogen gas and nitrogen gas as main components) is introduced into a furnace 10 filled with the gas.

Here, in the entrance seal portion 11, a roll seal 11a is used in order to suppress the atmosphere gas filled in the furnace 10 from flowing out to the outside.

In this furnace 10 , the treatment material 1 guided through the entrance seal portion 11 as described above is heated in the heating zone 12 within the furnace 10 .

Next, the material 1 heated in the heating zone 12 is led to the cooling zone 13 to be cooled, and the material 1 thus cooled is led to the top roll chamber 14 provided with rollers 14a and subjected to the treatment. The material 1 is led from the top roll chamber 14 through the chute 15 to the exit seal portion 16, and the material 1 to be treated is led out of the furnace 10 through the exit seal portion 16. As shown in FIG.

Here, also in the outlet seal portion 16, a roll seal 16a is used in order to suppress the atmosphere gas filled in the furnace 10 from flowing out to the outside.

In the continuous annealing furnace of this embodiment, the atmosphere gas leaked from the inlet seal portion 11 and the outlet seal portion 16 is replenished, and the material to be treated 1 introduced into the furnace 10 is treated with hydrogen gas. In order to sufficiently process the atmosphere gas by reacting with the atmosphere gas containing is output to the control device 22, and the control device 22 controls the atmospheric gas control valve 23a provided in the atmospheric gas supply pipe 23 for supplying the atmospheric gas containing hydrogen gas into the furnace 10. Atmospheric gas containing hydrogen gas is stably supplied.

Here, in the continuous annealing furnace of this embodiment, the atmospheric gas containing hydrogen gas is supplied to the heating zone 12 through the atmospheric gas supply pipe 23. However, the position where the atmospheric gas is supplied is It is not particularly limited, and may be supplied to the cooling zone 13 described above.

Further, in the continuous annealing furnace of this embodiment, an atmospheric gas purifying device is installed in the middle of the atmospheric gas circulation pipe 24 for circulating the atmospheric gas containing hydrogen gas in the furnace 10 between the cooling zone 13 and the heating zone 12 . 25 is provided, and the atmospheric gas containing hydrogen gas in the furnace 10 is purified by this atmospheric gas purification device 25 .

In the continuous annealing furnace of this embodiment, the atmosphere gas guide pipe 31 is provided to guide the atmosphere gas containing hydrogen gas in the furnace 10 to the sealed liquid tank 30 (bubbler) containing the liquid w, An exhaust pipe 32 is provided to exhaust the gas in the upper part of the liquid tank 30, and an inert gas supply pipe 33 is provided to supply an inert gas such as nitrogen gas to the upper part (space) of the liquid tank 30. In addition, the inert gas supply pipe 33 is provided with a control valve 33 a for controlling the supply of the inert gas to the upper part of the liquid tank 30 . Any liquid such as water or oil may be used as the liquid w.

Here, in the continuous annealing furnace of this embodiment, as shown in FIG. 1, the long material 1 to be treated is introduced through an inlet seal portion 11 into a furnace 10 filled with an atmospheric gas containing hydrogen gas, After the treatment material 1 is heated in the heating zone 12, the heated treatment material 1 is led to the cooling zone 13 and cooled. It is guided to the outlet seal portion 16 and led out from the furnace 10 through the outlet seal portion 16 for treatment.

In the continuous annealing furnace of this embodiment, the pressure of the atmosphere gas in the furnace 10 detected by the pressure detector 21 is output to the controller 22, and the controller 22 controls the atmosphere gas supply pipe. 23 is opened to stably supply the atmosphere gas containing hydrogen gas into the furnace 10, and the atmosphere gas containing hydrogen gas in the furnace 10 is purified as described above. It is purified by the device 25 and circulated between the cooling zone 13 and the heating zone 12 . In the drawing, when the atmosphere gas control valve 23a and the control valve 33a are opened, they are shown in white, and when they are closed, they are shown in black.

In the continuous annealing furnace of this embodiment, the pressure of the atmosphere gas containing hydrogen gas in the furnace 10 is detected by the pressure detection device 21 as described above, and the detected pressure is sent to the control device 22. The control device 22 controls the control valve 33a provided in the inert gas supply pipe 33. As shown in FIG.

In the continuous annealing furnace of this embodiment, for example, when the long treatment material 1 is changed to a material with a small heat capacity (thickness is reduced, material is changed, etc.), the temperature in the furnace 10 increases to For a while until it stabilizes, the pressure of the atmosphere gas in the furnace 10 increases, and when the pressure of the atmosphere gas introduced to the liquid tank 30 through the atmosphere gas guide pipe 31 increases, the pressure increases as shown in FIG. As described above, an increase in the pressure of the atmosphere gas in the furnace 10 is detected by the pressure detection device 21 and output to the control device 22, and the pressure of the atmosphere gas led to the liquid tank 30 changes to the atmosphere immersed in the liquid w. It becomes larger than the liquid pressure applied to the tip 31a of the gas guide pipe 31, and the atmospheric gas passes through as water bubbles and is led to the upper part of the liquid tank 30 through the liquid w in the liquid tank 30 (the pressure rise is As soon as it is detected), the control device 22 opens the control valve 33a provided in the inert gas supply pipe 33 to supply the inert gas to the upper part of the liquid tank 30 through the inert gas supply pipe 33. , the air existing in the upper part of the liquid tank 30 is exhausted through the exhaust pipe 32. As shown in FIG.

At this time, the set value to be detected by the pressure detection device 21 is set to a value smaller than the liquid pressure applied to the tip portion 31 a of the atmospheric gas guide pipe 31 .

By doing so, the atmosphere gas introduced from the furnace 10 through the atmosphere gas guide pipe 31 into the liquid tank 30 is introduced into the liquid tank 30 before being guided to the upper part of the liquid tank 30 through the liquid w in the liquid tank 30. The air existing in the upper part is diluted with the inert gas supplied to the upper part of the liquid tank 30 from the inert gas supply pipe 33 and exhausted, replaced with the inert gas, and the air in the upper part of the liquid tank 30 is exhausted. Atmospheric gas containing hydrogen gas led to the above is no longer likely to explode when coming into contact with air, and the atmospheric gas containing hydrogen gas can be safely exhausted.

Next, a modified example of the continuous annealing furnace according to the above embodiment will be described with reference to FIGS. 3 and 4. FIG.

In the continuous annealing furnace in this modification, in addition to the continuous annealing furnace according to the above-described embodiment, a second inert gas supply pipe 41 for supplying inert gas into the furnace 10 is provided, and this second inert gas supply pipe 41 is provided. A second control valve 41a is provided in the gas supply pipe 41, and the control device 22 controls opening and closing of the second control valve 41a. Here, in the drawing, similarly to the case of the atmospheric gas control valve 23a and the control valve 33a, the second control valve 41a is shown in white when it is open, and is shown in black when it is closed.

In addition, in the continuous annealing furnace in this modification, the inert gas is supplied to the cooling zone 13 from the second inert gas supply pipe 41, but the position where the inert gas is supplied is particularly Without limitation, the inert gas can also be supplied to the heating zone 12, the top roll chamber 14, and the like.

Here, in the continuous annealing furnace in this modified example, the pressure detection device 21 detects that the pressure in the furnace 10 has suddenly decreased due to an abnormality such as breakage of the furnace 10. Then, as shown in FIG. 4, the result detected by the pressure detection device 21 is output to the control device 22, and the control device 22 detects the atmosphere gas provided in the atmosphere gas supply pipe 23. The control valve 23a is closed to prevent the atmosphere gas containing hydrogen gas from being supplied into the furnace 10, and the control valve 41a provided in the second inert gas supply pipe 41 is opened to reduce the pressure of the furnace. 10, a large amount of inert gas is rapidly supplied (supercharged) through the second inert gas supply pipe 41 to replenish the pressure in the furnace 10, and air enters the furnace 10 from the outside. , is mixed with the atmosphere gas containing hydrogen gas in the furnace 10 so as to avoid the risk of explosion in the furnace 10 .

As a result of rapidly supplying a large amount of inert gas into the furnace 10 through the second inert gas supply pipe 41 in this way, the pressure of the atmosphere gas in the furnace 10 increases, and the pressure of the atmosphere gas through the atmosphere gas guide pipe 31 increases. When the pressure of the atmospheric gas introduced to the liquid tank 30 increases, the pressure detection device 21 detects the pressure rise of the atmospheric gas in the furnace 10 and performs the control as in the case shown in FIG. Before the atmospheric gas output to the device 22 and led to the liquid tank 30 is led to the upper part of the liquid tank 30 through the liquid w in the liquid tank 30, the inert gas supply pipe 33 is provided with the By opening the control valve 33a, the inert gas is supplied to the upper part of the liquid tank 30 through the inert gas supply pipe 33, and the air existing in the upper part of the liquid tank 30 is exhausted through the exhaust pipe 32. .

In this way, as in the case of the above-described embodiment, the atmosphere gas introduced from the furnace 10 through the atmosphere gas guide pipe 31 into the liquid tank 30 flows through the liquid w in the liquid tank 30 to the upper part of the liquid tank 30. The air existing in the upper part of the liquid tank 30 before being introduced is exhausted by the inert gas supplied to the upper part of the liquid tank 30 from the inert gas supply pipe 33 and replaced with the inert gas. In addition, the atmosphere gas containing hydrogen gas led to the upper part of the liquid tank 30 is not likely to explode when coming into contact with air, and the atmosphere gas containing hydrogen gas can be discharged safely.

Reference Signs List 1: treatment material 10: furnace 11: inlet seal portion 11a: roll seal 12: heating zone 13: cooling zone 14: top roll chamber 14a: roller 15: chute 16: outlet seal portion 16a: roll seal 21: pressure detector 22 : Control device 23 : Atmosphere gas supply pipe 23a : Atmosphere gas control valve 24 : Atmosphere gas circulation pipe 25 : Atmosphere gas refiner 30 : Liquid tank 31 : Atmosphere gas guide pipe 31a : Tip 32 : Exhaust pipe 33 : Inert gas Supply pipe 33a: Control valve 41: Second inert gas supply pipe 41a: Second control valve w: Liquid

Claims (4)

A long processing material is introduced into a furnace filled with an atmospheric gas containing hydrogen gas through an inlet seal portion, the processing material is heated in a heating zone in the furnace, and the processing material thus heated is heated. In a continuous annealing furnace in which the is cooled and annealed in a cooling zone, an atmosphere gas guide pipe is provided to guide the atmosphere gas containing hydrogen gas in the furnace to the liquid tank containing the liquid, and the gas in the upper part of the liquid tank Before the atmosphere gas containing hydrogen gas is led from the furnace to the upper part of the liquid tank through the atmosphere gas guide pipe and the liquid, the inert A continuous annealing furnace characterized in that gas is supplied to exhaust air in the upper part of the bath through the exhaust pipe. 2. The continuous annealing furnace according to claim 1, wherein an inert gas supply pipe for supplying an inert gas to the upper part of the liquid tank is provided, and the inert gas supply pipe is connected to the inert gas supply pipe to the upper part of the liquid tank. A control valve for controlling the supply and stop of the active gas is provided, a pressure detection device is provided for detecting the pressure in the furnace, and the control valve is controlled based on the pressure detected by the pressure detection device. A control device is provided, and the control valve is opened by the control device before the atmosphere gas containing hydrogen gas is led from the inside of the furnace through the atmosphere gas guide pipe and the liquid to the upper part of the liquid tank. A continuous annealing furnace, wherein an inert gas is supplied from the inert gas supply pipe to the upper part of the liquid bath, and air in the upper part of the liquid bath is exhausted through the exhaust pipe. 3. The continuous annealing furnace according to claim 2, wherein a second inert gas supply pipe for supplying an inert gas into the furnace is provided, and the second inert gas supply pipe is provided with an inert gas into the furnace. A second control valve is provided for controlling gas supply/stop, and when the pressure detection device detects a sudden decrease in the pressure in the furnace, the control device detects hydrogen gas in the furnace. A continuous annealing furnace, wherein the supply of atmosphere gas is stopped, the second control valve is opened, and the inert gas is supplied into the furnace from the second inert gas supply pipe. In the continuous annealing furnace according to claim 3, the pressure in the furnace to which the inert gas is supplied from the second inert gas supply pipe is detected by the pressure detection device, and the pressure detected by the pressure detection device Based on the above, before the atmosphere gas containing hydrogen gas is led from the furnace to the upper part of the liquid tank through the atmosphere gas guide pipe and the liquid, the control device opens the control valve and causes the 2. An inert gas is supplied to the upper part of the liquid bath from the inert gas supply pipe of (1), and the air in the upper part of the liquid bath is exhausted through the exhaust pipe.

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