JPH1046262A - Cooling device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To uniformly cool a steel strip in the width direction by circulating gas so as not to interrupt jet stream from gas blowing nozzles after cooling the steel strip. SOLUTION: The gas blowing nozzles 2 having gas blowing hole 6 and continuous shape in the width direction of the steel strip 1, are arranged by adjoining plural pieces in the longitudinal direction of the steel strip 1 at the position faced to the steel strip 1. Each gas blowing nozzle 2 has supplying header 3, 4 in each one line or two lines in the longitudinal direction of the steel strip 1. Plural pieces of the gas supplying headers 3, 4 are put together and an exhaust gas hood 5 is arranged to the back surface. The atmospheric gas is circulated through a gas blowing hole 6, exhaust gas hood 5, heat exchanger 8, blower 9 and gas injecting nozzle 2, in order, to cool the steel strip.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a continuous cooling device for continuously cooling an object to be cooled such as a metal strip in an atmosphere gas by blowing the gas.

[0002]

2. Description of the Related Art As a method of continuously cooling an object to be cooled such as a metal band in an atmosphere gas by blowing the gas, an atmosphere gas is taken out of a furnace, cooled, then pressurized by a blower or the like, and put into a furnace. There is a method of cooling by guiding and spraying the object to be cooled from a nozzle.

[0003] Conventionally, in order to carry out this type of cooling method,
A wind box or a header is arranged to face the object to be cooled, and gas is blown to the object to be cooled from a nozzle installed in the window box or the header.

Conventionally, as a cooling device for carrying out this type of cooling method, there is a gas jet cooling device disclosed in Japanese Patent Publication No. 5-80532, the outline of which is shown in FIG.
Shown in This gas jet type cooling device is provided with headers 13a and 13b on both sides of a steel strip 1 running between deflector rolls 11 in the direction of the arrow in the figure, and a blower 1
The straight nozzles 14a, 14b, 15a, 15b, and 15 that open the cooling gas supplied from 2a and 12b to the headers 13a and 13b, respectively, extend and open in the width direction of the steel strip 1.
a 'and 15b' are sprayed onto the steel strip 1. The gas blown to the steel strip 1 is supplied to the straight nozzles 14a, 14b, 15a, 15b, 15 extending and opening in the width direction.
a ′, 15b ′ is discharged across the steel strip 1 in the width direction and again from the gas inlet (not shown in the figure), which is usually installed on the side of the furnace, from the blower 12a, 12
b.

FIG. 4 shows an outline of a gas jet cooling apparatus disclosed in the specification and the drawings related to Japanese Utility Model Application No. 59-171681. This gas jet cooling device
A header 17 is provided facing the steel strip 1, and the cooling gas supplied from the blower 18 is blown from the pipe nozzle 19 to the steel strip 1. The gas blown to the steel strip 1 is discharged through the space between the pipe nozzle 19, the header 17 and the steel strip 1 over the steel strip, and is blown again through the gas inlet 20 installed on the side of the furnace. Circulated to 18.

FIG. 5 shows an outline of a gas jet cooling apparatus disclosed in Japanese Patent Application Laid-Open No. Sho 59-43820. This gas jet type cooling device is provided with a feed header 21 and a suction header 22 facing the steel strip 1, and blows cooling gas supplied from a blower from a nozzle 23 to blow the steel strip 1.
Is sprayed on. The gas blown to the steel strip 1 is sucked from the suction port 24 to the suction header 22 and circulated again to the blower.

[0007]

The conventional gas jet cooling apparatus is not limited to the above three examples, but it is necessary to arrange a plurality of nozzles to keep the cooling capacity industrially. Since the gas flowing along the surface of the steel strip after cooling has hindered the jet from the spray nozzle, the cooling capacity is considerably reduced as compared with the single nozzle. Further, when a plurality of rows of nozzles are used to ensure the cooling capacity, the gas after cooling flows in the width direction of the steel strip, so that the cooling capacity is distributed in the width direction and uniform cooling cannot be performed.

In order to solve this problem, as shown in FIG. 5, when the gas after cooling is suctioned and discharged by the suction header, both the feed header and the spray nozzle, and both the suction header and the suction port are used. In addition to the need for a system, which complicates the header structure, the pressure loss at the header increases due to the necessity of providing two headers for feeding in a narrow space, and the jet velocity of the blowing gas to the steel strip is uniform. It lacks properties and is not suitable for practical use. Further, since a suction blower is required, the equipment cost becomes excessive. For this reason, there is a problem that it cannot have a practically sufficient function for cooling the steel strip.

[0009] The present invention provides an inexpensive facility that recently solves the above-mentioned problems.

[0010]

The cooling device of the present invention is as follows.

In a cooling device that cools the object to be cooled by circulating the gas blown to the object to be cooled, a gas spray nozzle having a gas outlet that is continuous in the width direction of the object to be cooled is opposed to the object to be cooled. A plurality of gas spraying nozzles having gas supply headers in one or two rows in the longitudinal direction of the object to be cooled, at a plurality of positions adjacent to each other in the longitudinal direction of the object to be cooled.

[0012] The above-mentioned cooling device, wherein a plurality of gas supply headers are put together and an exhaust hood is arranged on the back surface thereof.

[0013] Gas supply headers having gas blowing nozzles arranged in one line in the longitudinal direction of the object to be cooled and gas supply headers having two lines in the longitudinal direction of the object to be cooled are alternately arranged in the longitudinal direction of the object to be cooled.
The distance between the gas supply header and the object to be cooled having the gas blowing nozzles arranged in a line in the longitudinal direction of the object to be cooled and the distance between the gas supply header and the object to be cooled having two rows are different. Cooling system.

The cooling device according to any one of the above-mentioned items, wherein the ambient gas is circulated and cooled in the order of the gas outlet, the exhaust hood, the heat exchanger, the blower, and the gas spray nozzle.

[0015]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a schematic sectional view of one row of the cooling device of the present invention, and FIG. 2 is a schematic front view of one row of the cooling device of the present invention.
The gas blowing nozzle 2 is installed to face the steel strip 1 to be cooled, and has a gas blowing port 6 from which gas continuously protrudes hydrodynamically in the width direction. The illustrated gas spray nozzle 2 is a straight slit nozzle, but may have a tapered slit nozzle, harmonica nozzle, or a structure in which a number of tubular nozzles are arranged in the width direction. The gas spray nozzles 2 are gas supply headers 3 and 4 for supplying gas alone or in every two rows.
have. The gas supply headers 3 and 4 are surrounded by an exhaust hood 5 as a plurality.

After the cooling gas is first supplied to the gas supply headers 3 and 4, the cooling gas is blown to the steel strip 1 through the respective gas blowing nozzles 2. The cooling gas blown from the gas blowing nozzle 2 collides with the steel strip 1 as shown by the arrow in FIG. Flow backward. This is because the gas surrounded by the exhaust hood 5 is sucked behind the gas supply headers 3 and 4. Therefore, the cooling gas blown from each gas blowing nozzle is discharged to the rear of the gas supply headers 3 and 4 without affecting the gas flow from the adjacent gas blowing nozzle, so that a decrease in cooling capacity can be prevented. . Further, since almost no gas flow occurs in the width direction of the steel strip 1, uniformity in the width direction of the cooling can be ensured.

The cooling gas is then collected in the exhaust hood 5 and discharged out of the furnace through the furnace wall 7. After the temperature of the cooling gas discharged outside the furnace is reduced by the heat exchanger 8, the pressure of the cooling gas is increased to a predetermined pressure by the blower 9, and the cooling gas is supplied to the gas supply headers 3 and 4 through the cooling gas supply pipe 10.

In order to improve the cooling capacity, the number of gas blowing nozzles 2 may be increased. However, since the adjacent gas supply headers 3 and 4 interfere with each other, it is necessary to increase the number of gas blowing nozzles 2. Has limitations. Therefore, a gas supply header 4 provided with one gas blowing nozzle 2 and a gas supply header 3 provided with two gas blowing nozzles 2 are alternately arranged, and as shown in FIG. , The cooling capacity can be increased by inserting the gas spray nozzle 2 from between the gas supply headers 3.

[0020]

According to the cooling device of the present invention, the gas after cooling can be properly discharged from a place where the gas jet from another gas spray nozzle is not obstructed, without being forcedly sucked by the suction duct. This eliminates the necessity of providing headers for both the spraying and suction systems, and it is possible to secure a sufficient space for installing the spraying headers, so that a uniform gas jet velocity can be secured and the temperature distribution of the steel strip after cooling. Is also good. Since the gas flow in the width direction of the steel strip is prevented by adjoining the nozzle in the longitudinal direction of the steel strip, the uniformity of the cooling in the width direction of the steel strip is also improved. In addition, the present cooling device can be used as a general cooling device for a continuous annealing furnace for a steel strip, but in particular, a soaking zone installed after a heating zone in a continuous annealing furnace for a cold-rolled steel strip requiring a large cooling capacity. Useful for heat cooling zones.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view of one row of a cooling device of the present invention.

FIG. 2 is a schematic front view of a row of the cooling device of the present invention.

FIG. 3 is a schematic view of a conventional cooling device.

FIG. 4 is a schematic view of a conventional cooling device.

FIG. 5 is a schematic view of a conventional cooling device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Steel strip 2 Gas blowing nozzle 3 Gas supply header 4 Gas supply header 5 Exhaust hood 6 Gas outlet 7 Furnace wall 8 Heat exchanger 9 Blower 10 Cooling gas supply pipe 11 Deflector roll 12a, 12b Blower 13a, 13b Header 14a, 14b Straight nozzle 15a, 15b Straight nozzle 15a ', 15b' Straight nozzle 16 Gas pipe 17 Header 18 Blower 19 Pipe nozzle 20 Gas inlet 21 Feed header 22 Suction header 23 Spray nozzle 24 Suction port

Claims (4)

[Claims] 1. A cooling device for cooling a cooled object by circulating a gas blown to the cooled object, comprising: a gas spray nozzle having a gas outlet having a shape continuous in a width direction of the cooled object; A plurality of gas spray nozzles are arranged adjacent to each other in the longitudinal direction of the object to be cooled at a position facing the object, and each gas blowing nozzle has a gas supply header in one or two rows in the longitudinal direction of the object to be cooled. . 2. The cooling device according to claim 1, wherein a plurality of gas supply headers are grouped together and an exhaust hood is disposed on a back surface thereof. 3. A gas supply header having gas blowing nozzles arranged in a line in the longitudinal direction of the object to be cooled and gas supply headers having two rows in the longitudinal direction of the object to be cooled are alternately arranged in the longitudinal direction of the object to be cooled. 3. The cooling device according to claim 1, wherein the distance between the gas supply headers and the object to be cooled in one line in the longitudinal direction is different from the distance between the gas supply headers and the object to be cooled in two rows. 4. The cooling device according to claim 1, wherein the ambient gas is circulated and cooled in the order of a gas outlet, an exhaust hood, a heat exchanger, a blower, and a gas spray nozzle.