KR102425769B1 - Cooling apparatus of snout snorkel - Google Patents

Abstract

The snout snorkel cooling device according to the present invention includes a snorkel part for preventing oxidation by enclosing a steel sheet flowing into the hot-dip galvanizing bath by being submerged in the molten metal surface of the hot-dip galvanizing bath and spaced apart from the steel sheet by a predetermined distance from the end of the snorkel a snout including a dam unit having a dam forming part enclosing the galvanizing bath so that the hot-dip galvanizing solution in the hot-dip galvanizing bath overflows to the inner circumferential side of the snorkel part to prevent foreign substances falling on the hot water surface in the snorkel part from adhering to the steel plate; It is installed in the snout and pumps the hot-dip galvanizing solution overflowing the dam forming part of the dam unit into the hot-dip galvanizing tank outside the snorkel part so that foreign substances contained in the hot-dip galvanizing solution overflowing the dam forming part do not adhere to the steel sheet. a cooling chamber for cooling the hot-dip galvanizing solution heated by the steel plate and provided on at least one side of the outer circumferential surface of the snorkel part; and a cooling gas for supplying cooling air to the cooling chamber and a molten metal cooling unit having a supply unit.

Description

Cooling apparatus of snout snorkel

The present invention relates to a snout snorkel cooling device, and more particularly, to a snout snorkel cooling device capable of preventing abnormal heating of a snout snorkel portion by a hot-dip galvanizing solution whose temperature is increased by a high-temperature steel sheet. will be.

In general, in the hot-dip galvanizing process, the steel sheet that has undergone the cold rolling process is heat-treated in a heating furnace to make a coil with excellent formability and plating adhesion, and then is continuously sold through a payoff reel and a welding machine to remove residual stress ( annealing furnace). The heat-treated steel sheet is maintained at a temperature suitable for galvanizing, and then flows into a plating solution, that is, a hot-dip galvanizing bath filled with hot-dip zinc.

The temperature of the hot-dip galvanizing bath is maintained at approximately 455~460℃. The melting point of zinc is 420℃. The molten galvanizing solution in the hot-dip galvanizing bath maintains a molten state, but the zinc fume continues to evaporate to the top. will do

For hot-dip galvanizing, the steel sheet is continuously supplied into the hot-dip galvanizing bath through the inside of the snout and the sink roll is wound and galvanized. It enters the alloying furnace at a location away from it and is heat-treated by the alloying furnace.

As described above, since the steel sheet flowing into the hot-dip galvanizing bath through the snout snorkel during the plating process is maintained at a temperature higher than the temperature of the hot-dip galvanizing bath after heat treatment, the side where the steel sheet flows into the hot-dip galvanizing bath; That is, there is a problem in that the temperature of the hot-dip galvanizing solution in the snorkel portion of the snout is higher than the ambient temperature.

This increase in the temperature of the hot-dip galvanizing solution around the snorkel increases the ash (hereinafter referred to as 'foreign substance'), which is an evaporated product of the hot-dip galvanizing solution. It is attached and falls to the surface of the steel plate or the molten metal in the snout by its own weight.

Foreign substances falling on the steel sheet cause fatal surface defects, and the ash that has fallen to the hot water surface is attached to the surface of the plated steel sheet while floating, or forms an intermittent or continuous band in the direction of the steel sheet, resulting in galvanizing quality of the steel sheet. There is a problem of lowering

In addition, there is a problem in that the deformation and erosion of the snorkel are promoted due to the high temperature of the snout snorkel part.

Korean Patent Registration No. 10-0815810 discloses a cooling apparatus and cooling method for a plating solution in a molten plating bath. The disclosed cooling device includes a plating solution circulating means provided in a plating bath filled with a plating solution for continuous plating of a steel sheet, and includes a plating solution suction nozzle disposed on one side or both sides of a steel sheet introduced into the plating bath to circulate the plating solution; and a plating solution cooling means connected to the plating solution circulation means and disposed inside or outside the plating bath to cool the circulating plating solution, wherein the suction nozzle of the plating solution circulation means includes a snout connected to the plating bath and a plating bath. Between the rolls, the plating solution is placed in the lead-in area of the steel sheet.

Korean Patent Registration No. 10-1382903 discloses a method for reducing metal vapor in a snout and a snout for its implementation. The published reduction method includes the steps of controlling the surface temperature of the material to be plated so that condensation nuclei of the metal vapor are generated on the surface of the material to be plated, and the metal condensate formed by condensing the metal vapor around the generated condensation nuclei. A method for reducing metal vapor in a snout, including the step of entering the ash into the molten metal, wherein the pre-formed metal condensate has a diameter of less than 1 μm (excluding 0) at the time of entry into the molten metal of the material to be plated.

The above-described conventional apparatus for reducing metal vapor in the snout reduces the condensate by controlling the temperature of the coated metal material, but in this case, there is a problem in that the defective rate according to the plating of the steel sheet, which is the feed metal material, is relatively increased.

In particular, when the temperature of the steel sheet is high, the solubility of iron components constituting the steel sheet increases, thereby reducing the purity of the plating solution.

Korean Patent Registration No. 100887534 discloses a cooling device for galvanized aluminum alloy hot-dip galvanized steel sheet.

1) Republic of Korea Patent No. 10-0815810 Korean Patent Registration No. 10-1382903 Republic of Korea Patent Registration No. 100887534

The present invention is to solve the conventional problems as described above, and the temperature of the hot-dip galvanizing solution in the snout is increased by the heated steel sheet during the hot-dip galvanizing process to reduce the amount of foreign substances evaporating from the molten metal surface. Further, by reducing the amount of foreign substances attached to the inner surface of the snout, the object is to provide a snout cooling device capable of reducing defects in which foreign substances fall and adhere to the steel plate.

Another object of the present invention is to provide a snout snorkel cooling device capable of preventing an increase in solubility of iron (Fe) from a steel sheet passing through a hot-dip galvanizing solution and deformation of the snorkel.

The snout snorkel cooling device of the present invention for achieving the above object includes a snorkel part for preventing oxidation by enclosing the steel sheet flowing into the hot-dip galvanizing bath with an end submerged in the molten metal surface of the hot-dip galvanizing bath, and from the end of the snorkel part A snout including a dam unit having a dam unit wrapped around the steel plate to be spaced apart from the steel plate by a predetermined distance and having a dam forming part that prevents foreign substances falling on the molten surface in the snorkel part from adhering to the steel plate by allowing the hot-dip galvanizing solution in the hot-dip galvanizing bath to overflow toward the inner circumferential side of the snorkel part. Wow;

It is installed in the snout and pumps the hot-dip galvanizing solution overflowing the dam forming part of the dam unit into the hot-dip galvanizing tank outside the snorkel part so that foreign substances contained in the hot-dip galvanizing solution overflowing the dam forming part do not adhere to the steel sheet. and a molten zinc discharge unit that prevents

A molten metal cooling unit having a cooling chamber installed on at least one side of the outer peripheral surface of the snorkel unit to cool the hot-dip galvanizing solution heated by the steel sheet, and a cooling gas supply unit for supplying cooling air to the cooling chamber. characterizes

Snout snorkel cooling device according to the present invention is that the temperature of the hot-dip galvanizing solution around the dam unit increases when the heat-treated steel sheet flows into the dam unit side of the snorkel part installed under the snout part, and the amount of ash evaporation into the snorkel part increases It is possible to fundamentally prevent it, and it is possible to prevent foreign substances attached to the inner surface of the snout from falling and contaminating the plated steel sheet, and it is possible to reduce the amount of deformation of the snorkel part due to high temperature.

1 is a side cross-sectional view showing an internal foreign material removal device of a snout in a steel sheet hot-dip galvanizing process according to the present invention;
2 is a cross-sectional view of the molten metal surface foreign substance removal device in the hot-dip galvanizing process shown in FIG. 1;
3 is a cross-sectional view showing an extract of the molten zinc discharge unit shown in FIGS. 1 and 2;
4 is a partially cut-away cross-sectional view showing other embodiments of the molten zinc discharging unit.

An embodiment of a snout cooling device according to the present invention is shown in FIGS. 1 to 4 .

The snout snorkel device according to the present invention cools the hot-dip galvanizing solution around the dam unit so that the temperature of the hot-dip galvanizing solution around the dam unit does not increase when the steel sheet flows into the molten metal of the hot-dip galvanizing bath, that is, the hot-dip galvanizing solution for plating the heat-treated steel sheet. .

The snout snorkel cooling device 10 has an end submerged in the hot water surface 1 of the hot-dip galvanizing bath 100 to prevent oxidation surrounding the steel plate 200 flowing into the hot-dip galvanizing bath 100 . (40) is provided. As forming the snout 40 , the lower side of the snout 40 is provided with a snorkel part 20 whose lower end is submerged in the hot-dip galvanizing bath 100 . The snorkel part 20 extends upwardly inside to be adjacent to the outer circumferential surface of the steel plate 200 passing through the snorkel part 20 from the lower end thereof to prevent foreign substances falling on the hot water surface in the snorkel part 20 from adhering to the steel plate. Includes a dam unit 30, and a molten metal cooling unit 60 that prevents the hot-dip galvanizing solution around the dam unit 30 of the snorkel unit 20 from being heated by the heat-treated steel sheet 200. do.

Then, the hot-dip galvanizing solution 2 installed in the snorkel part 20 and overflowing the dam forming part 32 of the dam unit 30 is pumped into the hot-dip galvanizing tank 100 to form the snorkel part 20. A molten zinc discharging unit 50 is provided to prevent foreign substances floating inside from adhering to the steel sheet.

The snout cooling apparatus according to the present invention configured as described above will be described in more detail for each component as follows.

The snorkel part 20 constituting the snout 40 is installed on the side of the hot-dip galvanizing bath 100 between the heat treatment furnace (not shown) and the hot-dip galvanizing bath 100 and heated for heat treatment ( 200) has a structure that surrounds the steel plate 200 introduced into the hot-dip galvanizing bath 100 is guided by rollers to prevent oxidation in contact with air.

The snout 40 may be formed by combining unit members in the shape of a square tube and the snorkel unit 20 . And the end of the snout 40 may be further provided with a separate actuator (not shown) that rotates a part of the snorkel part 20 to be immersed in or lifted from the hot-dip galvanizing bath 100 .

The dam unit 30 may be integrally formed with the snorkel unit 20 or may be separately manufactured and combined. As shown in FIGS. 1 and 2, the dam unit 30 passes through the inside of the snorkel unit 20, that is, the steel sheet introduced into the hot-dip galvanizing bath 100 through the inner space of the snorkel unit 20. A storage space of molten zinc overflowing through the steel plate inlet 31 by connecting the dam forming part 32 forming the steel plate inlet 31 and the lower end of the dam forming part 32 and the lower end of the snorkel part 20 A chamber forming part (33) forming a (34) is provided.

The upper end of the dam forming part 32 of the dam unit 30 has the same height as the hot water surface 1 in the snorkel part 20 while the snorkel part 20 is immersed in the hot-dip galvanizing bath 100, or located in a relatively low position.

Therefore, the molten hot-dip galvanizing solution 2 in the hot-dip galvanizing bath 100 flows in through the steel plate inlet 31 through which the steel plate 200 passes, overflows the dam forming part 32, and the chamber forming part 33. is stored in the storage space 34 formed by

The dam unit 30 is not limited by the above-described embodiment, and floating matter or foreign substances including ash in the snorkel unit 20 are attached to the surface of the steel plate 200 passing through the steel plate inlet 31 . It is possible if the structure is such that the molten zinc passing through the steel plate inlet 31 can flow in a direction away from the surface of the steel plate 200 to be plated.

The molten zinc discharging unit 50 overflows the dam forming part 32 of the dam unit 30 and snorkels the molten zinc plating solution 2 stored in the storage space 34 formed by the chamber forming part 33 . The hot-dip galvanizing solution 2 in the hot-dip galvanizing bath 100 is discharged into the hot-dip galvanizing bath 100 outside the part 20 so that the hot-dip galvanizing solution 2 can be continuously introduced through the steel plate inlet 31 .

The molten zinc discharge unit 50 is installed in the snorkel unit 20 and overflows the dam forming unit 32 of the dam unit 30 to discharge the molten zinc stored in the storage space 34. At least one inflow It includes a molten metal pump 52 connected to the unit 51 and a driving motor 53 for driving the molten metal pump 52 .

On the other hand, in the molten metal cooling unit 60 according to the present invention, the heat-treated steel sheet is introduced into the hot-dip galvanizing solution 2 of the hot-dip galvanizing bath 100 and melts around the steel sheet inlet 31 of the snorkel unit 20 . In order to prevent the temperature of the galvanizing solution 2 from rising, a cooling chamber 61 is formed on the outer peripheral surface of the snorkel part 20 or the dam unit 30 as shown in FIGS. 2 and 3, and this A cooling gas supply unit 65 for supplying cooling gas to the cooling chamber 61 is provided.

The cooling chamber 61 is formed along the chamber forming part 33 or along the inner surface of the dam forming part 32 so as to cool the heated hot-dip galvanizing solution around the steel plate inlet 31 . The cooling chamber 61 may be formed of a pipe or a tube such as a square or a circle integral with the snorkel unit 20 . Although not shown in the drawings, the cooling chamber may be formed on the outer wall of the snorkel unit 20 .

The cooling chamber 61 may be formed in a meandering shape to increase the contact area with the hot-dip galvanizing solution 2 around the steel plate inlet 31 .

In addition, the cooling gas supply unit 65 is for supplying cooling gas to the cooling chamber 61 , and includes a gas supply pipe 66 and a gas discharge pipe 67 connected to the cooling chamber 61 . The gas supply pipe 66 includes a gas tank 68 or a blower 69 for supplying a cooling gas, that is, an inert gas such as cooling air or nitrogen. However, the present invention is not limited thereto, and a cooling water supply nozzle or cooling mist may be supplied to the gas supply pipe 66 in the chamber, and a flow meter, a control valve, a control unit, and the like capable of controlling the flow rate of the cooling gas may be configured. To this end, as shown in FIG. 1, the cooling gas supply unit 65 includes a water mist generator 80 for atomizing cooling water, a known cooler 81 for cooling the supplied gas, that is, driven by a refrigeration cycle. A cooler may be further provided.

On the other hand, although not shown in the drawings, the gas supply pipe 66 and the gas discharge pipe 67 are interconnected to form a circulation pipe in which the cooling gas circulates, and in this circulation pipe, a refrigerator for cooling the cooling gas, a Peltier element , a heat exchanger and a blower for heat dissipation may be further provided. In addition, a cooling device capable of cooling the exhaust gas may be further provided at the rear end of the gas discharge pipe 67 .

The gas supply pipe 66 may be installed on the front and rear surfaces of the snorkel unit 20 with the steel plate 200 as the center to supply cooling gas to the cooling chamber 61 .

The operation of the snout cooling device according to the present invention configured as described above will be described as follows.

First, as shown in FIGS. 1 and 2 , the lower part of the snorkel part 20 is set in the molten metal of the hot-dip galvanizing bath 100 so that the end of the snorkel part 20 is located at a position lower than the water level of the hot water surface 1 . When partially immersed, the hot-dip galvanizing solution 2 in the hot-dip galvanizing bath 100 overflows the dam forming unit 32 and is stored in the storage space 34 partitioned by the chamber forming unit 33. Then, the melting The hot-dip galvanizing solution 2 stored in the storage space 34 in the zinc discharge unit 50 is pumped to the hot-dip galvanizing bath 100 .

In this state, the heat-treated steel plate 200 is introduced through the steel plate inlet 31 of the dam unit 30 , is plated, and then discharged via the roller 101 installed in the hot-dip galvanizing bath 100 .

In this process, since the steel sheet 200 is in a heat-treated state, the temperature of the hot-dip galvanizing solution 2 around the dam unit 30 of the snout is increased by the heated steel sheet 200, and the snout 40 Since the molten metal cooling unit 60 is installed in the snorkel part 20 of the

That is, external air is supplied to the gas supply pipe 66 of the molten metal cooling unit 60 by using the blower 69 or an inert gas such as nitrogen or argon is supplied from the inert gas gas tank 68 . The cooling gas supplied from the gas supply pipe 66 is supplied to the cooling chamber 61 provided in the chamber forming unit 33 or the dam forming unit 32 of the snorkel unit 20 or the dam unit 30 . As such, by supplying the cooling gas having a relatively low temperature to the cooling chamber 61, heat exchange with the cooling chamber 61 in contact with the hot-dip galvanizing solution 2 is made, and thus the snorkel part heated by the steel plate 200 ( 20), it is possible to lower the temperature of the galvanizing solution (2) around.

To explain this in more detail, the excess heat of the heat-treated steel sheet 200 is transferred to the hot-dip galvanizing solution 2 , and this heat transfer causes the steel sheet 200 to be transferred to the hot-dip galvanizing solution in the hot-dip galvanizing bath 100 . Since most of this occurs in the snorkel part 20 that is in first contact with (2), the temperature of the hot-dip galvanizing solution 2 flowing into the chamber forming part 33 in particular rises rapidly. That is, since the heat-treated steel sheet 200 at a relatively high temperature (about 465 to 475° C.) is continuously drawn into the hot-dip galvanizing solution 2 of the hot-dip galvanizing bath 100, the initial region of the steel sheet draw-in, i.e. , the temperature of the hot-dip galvanizing solution 2 is locally increased at the steel plate inlet 31 of the dam unit 30 .

However, since the molten metal cooling unit 60 is installed in the dam unit 30 area of the snout 110, which is the area where heat transfer from the steel sheet 200 to the hot-dip galvanizing solution 2 occurs most preferentially, the hot-dip galvanizing solution ( 2) it is possible to preferentially cool the excess heat amount of the steel sheet 200 flowing into.

Therefore, it is possible to prevent the excess heat from the steel sheet 200 from spreading to the whole of the hot-dip galvanizing solution 2 , and in particular, when producing a thick steel sheet 200 , the temperature increase of the hot-dip galvanizing solution 2 can be very effectively reduced. be able to control

As described above, the molten metal cooling unit 60 can keep the temperature of the hot-dip galvanizing solution 2 in the hot-dip galvanizing bath 100 constant by cooling the overheated hot-dip galvanizing solution 2, so that the plating temperature Stabilization and plating reactivity can be made uniform. In addition, it is possible to reduce the amount of ash that the hot-dip galvanizing solution 2 evaporates into the snout, and the ash attached to the inner circumferential surface of the snout, that is, foreign substances falling off and adhering to the surface of the galvanized steel sheet, causes plating defects can prevent

In addition, it is possible to reduce the amount of deformation of the snorkel portion 20 that is continuously deformed by the high temperature, and the erosion phenomenon of the snorkel portion 20 due to the high temperature can also be reduced, thereby reducing the repair cost.

Although the snout snorkel cooling device according to the present invention described above has been described with reference to the accompanying drawings, this is only exemplary, and various modifications and equivalent other embodiments are possible by those skilled in the art. will understand that

Accordingly, the scope of true technical protection of the present invention should be defined only by the technical spirit of the appended claims.

Claims (4)

A snorkel part 20 for preventing oxidation by enclosing the steel plate 200 having an end submerged in the hot water surface 1 of the hot-dip galvanizing bath 100 and flowing into the hot-dip galvanizing bath 100, and the snorkel part 20 ) from the end of the steel plate 200 and spaced apart from the steel plate 200 by a predetermined distance, and the hot-dip galvanizing solution 2 in the hot-dip galvanizing bath 100 overflows toward the inner peripheral surface of the snorkel unit 20, and falls to the molten water surface in the snorkel unit 20. a snout 40 including a dam unit 30 having a dam forming part 32 that prevents foreign substances from adhering to the steel plate;
The hot-dip galvanizing solution 100, which is installed in the snout 40, overflowing the dam forming part 32 of the dam unit 30, is poured into the hot-dip galvanizing bath 100 outside the snorkel part 20. and a molten zinc discharge unit (50) for preventing foreign substances contained in the hot-dip galvanizing solution (2) overflowing the dam forming part (32) from adhering to the steel sheet by pumping;
A cooling chamber 61 installed on at least one side of the outer circumferential surface of the snorkel unit 20 to cool the hot-dip galvanizing solution 2 heated by the steel plate 200, and a cooling gas in the cooling chamber 61 It includes a molten metal cooling unit 60 having a cooling gas supply unit 65 for supplying,
The cooling chamber (61) is a snout snorkel cooling device, characterized in that formed on the outer peripheral surface of the snorkel part (20) or the chamber forming part (33) of the dam unit (30). delete The method of claim 1,
The cooling gas supply unit 65 includes a gas supply pipe 66 and a gas discharge pipe 67 installed in the cooling chamber 61, and the gas supply pipe 66 is a blower 69 for supplying cooling gas. Or a snout snorkel cooling device, characterized in that the gas tank is installed. The method of claim 1,
Snout snorkel cooling device, characterized in that a cooler or a water mist generator (80) for increasing the cooling capacity of the gas is further provided in the pipe of the cooling gas supply unit (65)

Images