KR101837313B1 - Apparatus for filtering ash in snout of galvanizing line - Google Patents

Abstract

The present invention relates to an apparatus for filtering ash in a snout, comprising: a gas sucking portion for sucking gas vaporized from a bath surface in a snout during hot dip galvanizing; a filtering portion for filtering zinc particles contained in the sucked gas to discharge filtering gas; a moisture removing portion for removing moisture from the discharged filtering gas; and a re-injecting portion for re-injecting the filtering gas into which the moisture has been removed. Thus, defects in adhesion of zinc generated from zinc contamination in the process of hot dip galvanizing can be prevented in advance such that a surface quality of a hot dip galvanized product can be improved.

Description

[0001] APPARATUS FOR FILTERING ASH IN SNOUT OF GALVANIZING LINE [0002]

The present invention relates to a hot dip galvanizing method and a hot dip galvanizing method in which zinc vapor is sucked from a bathtub bath surface in a Snat in an inert gas atmosphere to filter zinc particles, And to improve the surface quality of the Snhart's Esh filter.

As is well known, a continuous galvanizing line (CGL) is used to protect the surface of a steel sheet while passing a steel strip (metal strip) through a plating bath filled with molten zinc to prevent rust on the surface of the steel sheet, Quot; means a production line for plating a zinc coating on the surface of a substrate.

1, the cold-rolled steel strip is heat-treated in a furnace 1 to remove residual stress, and the heated strip is subjected to heat treatment for zinc plating The molten zinc can be introduced into the plating bath 3 (Zn pot) filled with molten zinc while being maintained at an appropriate temperature and guided to the inside of the Snout 2 (Snout). Herein, Snooth 2 is a device for guiding the path between the heating furnace 1 and the plating bath 3 in an inert gas atmosphere in order to prevent surface oxidation caused by exposure of the heated strip to atmosphere Device.

Thereafter, in the plating bath 3, a galvanized steel strip is guided to the sink roll 4 and discharged to the outside of the plating bath 3. The discharged galvanized steel strip is passed through an air knife 5, Air Knife) to adjust the required amount of plating.

In the hot dip galvanizing process as described above, the evaporated gas (including zinc particles) accumulates on the inner wall (inner surface) of the Snart 2 to be accumulated and attached as an ash. It may fall on the surface of the galvanized steel strip or fall on the molten zinc bath surface of the plating bath 3 and may be incorporated into the surface of the galvanized steel strip.

Since such an Esh is a source of contamination that causes line defects and unplated on the surface of a steel sheet, it acts as a fatal defect factor for a high-quality galvanized product, and various devices capable of effectively removing the Ash in the Snart have been proposed It is true.

1. Korean Patent Publication No. 10-2004-0006530 (2004.04.24.) 2. Korean Registered Patent No. 10-1383808 (Apr.

The present invention relates to a hot dip galvanizing method and a hot dip galvanizing method in which zinc vapor is sucked from a bathtub bath surface in a Snat in an inert gas atmosphere to filter zinc particles, Which is capable of improving the surface quality of the Snooth-type Esh filter.

Further, according to the present invention, after the gasified gas is sucked from the bath surface in the Snart during hot-dip galvanizing, and the zinc particles contained in the sucked gas are filtered, the moisture of the discharged filtering gas is controlled and re- , It is possible to remove zinc pollutants generated in the process of hot dip galvanizing by the water tank method, so that no separate filter material is required, which is effective in terms of cost reduction. By constantly filtering the atmosphere gas in the Snart, To thereby improve the surface quality of the hot-dip galvanized product.

The objects of the embodiments of the present invention are not limited to the above-mentioned objects, and other objects not mentioned can be clearly understood by those skilled in the art from the following description .

According to an embodiment of the present invention, there is provided a method of manufacturing a hot dip galvanizing apparatus, comprising: a gas sucking portion for sucking a gas vaporized from a hot surface in a Snout during hot dip galvanizing; a filtering portion for filtering the zinc particles contained in the sucked gas, A water rejection unit for removing water from the exhausted filtering gas, and a re-input unit for re-introducing the filtering gas into which the moisture has been removed, into the snout.

Further, according to the embodiment of the present invention, the filtering unit may be provided with an in-bunch Esh filtering apparatus for filtering the gas through the at least one water tank through the water tank.

Also, according to the embodiment of the present invention, the gas suction unit may be provided with a snout filter in which a suction pipe having a plurality of suction holes is provided adjacent to the inner surface of the snout.

According to an embodiment of the present invention, the suction pipe is provided at an angle of 40-50 degrees with respect to the bath surface of the plating bath, and the plurality of suction holes are formed in an inner wall of a Snart A filtering device may be provided.

Also, according to the embodiment of the present invention, the re-charging unit may be provided with a Snart filtering apparatus in which a re-charging pipe provided with a plurality of re-charging holes is provided adjacent to the inner surface of the Snart.

Further, according to the embodiment of the present invention, the re-injection pipe may be provided with a Snart filtering device provided at a slope of 40-50 from the bath surface of the plating bath.

The present invention relates to a hot dip galvanizing method and a hot dip galvanizing method in which zinc vapor is sucked from a bathtub bath surface in a Snat in an inert gas atmosphere to filter zinc particles, The surface quality of the substrate can be improved.

Further, according to the present invention, after the gasified gas is sucked from the bath surface in the Snart during hot-dip galvanizing, and the zinc particles contained in the sucked gas are filtered, the moisture of the discharged filtering gas is controlled and re- , It is possible to remove zinc pollutants generated in the process of hot dip galvanizing by the water tank method, so that no separate filter material is required, which is effective in terms of cost reduction. By constantly filtering the atmosphere gas in the Snart, So that the surface quality of the hot-dip galvanized product can be improved.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a view for explaining a zinc pollutant generated in a hot dip galvanizing process and a problem thereof,
FIGS. 2 to 4 are views illustrating an intra-snout intra-edge filtering apparatus according to an embodiment of the present invention.

Advantages and features of embodiments of the present invention and methods of achieving them will become apparent with reference to the embodiments described in detail below with reference to the accompanying drawings. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. To fully disclose the scope of the invention to those skilled in the art, and the invention is only defined by the scope of the claims. Like reference numerals refer to like elements throughout the specification.

In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear. The following terms are defined in consideration of the functions in the embodiments of the present invention, which may vary depending on the intention of the user, the intention or the custom of the operator. Therefore, the definition should be based on the contents throughout this specification.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIGS. 2 to 4 are views illustrating an intra-snout intra-edge filtering apparatus according to an embodiment of the present invention.

2 to 4, an apparatus for filtering in-snout water according to an exemplary embodiment of the present invention includes a gas suction unit 110, a filtering unit 120, a water removing unit 130, a re- . ≪ / RTI > Here, the same components as those shown in Fig. 1 are denoted by the same reference numerals and will be described below.

The gas suction unit 110 sucks the gas vaporized from the plating bath surface in the Snart 2 during the hot dip galvanizing and includes a suction pipe 111, a plurality of suction holes 112, a suction fan 113 . ≪ / RTI >

Here, the suction pipe 111 is provided such that one end of the suction pipe 111 passes through the inner and outer portions of the snout 2 and is adjacent to the inner side thereof and the other end thereof is connected to the filtering portion 120. In the portion adjacent to the snout 2, A plurality of suction holes 112 may be formed in the suction pipe 111 so as to be adjacent to the inner surface of the snout 2.

This suction pipe 111 is provided at an angle of about 40-50 DEG from the bath surface of the plating bath 3 for efficiently sucking the vaporized gas, and a plurality of suction holes 112 are formed at intervals of 5-10 mm each .

The suction fan 113 is installed on the piping of the suction pipe 111 to suck the gas vaporized in the snout 2 through a plurality of suction holes 112 formed in the suction pipe 111 , And the fan output of the suction fan 113 to which the VF (vacuum flow) method is applied can be set to adjust the suction pressure and the sucking flow rate for sucking the zinc gas in the Snart 2.

One end of the suction pipe 111 passing through the inner and outer portions of the snout 2 and adjacent to the inner side of the suction pipe 111 is branched into two suction pipes as shown in Fig. 3, and is provided on both sides of the strip However, it is needless to say that the upper and lower surfaces of the strip may be spaced apart from each other by a predetermined distance.

The filtering unit 120 filters the zinc particles contained in the sucked gas to discharge the filtering gas. The sucked gas is filtered using the at least one water tank through the water tank. The first gas inlet The first water discharge pipe 123, the first discharge control valve 124, the second gas inflow pipe 125, the second water tank 126, the second water tank 126, A gas discharge pipe 127, a second discharge control valve 128, a flow control valve 129, and the like.

 The other end of the suction pipe 111 of the gas suction unit 110 may branch and branch to the first gas inflow pipe 121 and the second gas inflow pipe 125 and may be branched from the suction pipe 111 The branched first gas inflow pipe 121 is connected to the lower end of the first water tank 122 and the gas introduced into the first water tank 122 through the first gas inflow pipe 121 flows into the first water tank 122, The zinc particles can be filtered while passing through the water filled in the filter 122.

The first water tank 122 is provided with a first gas discharge pipe 123 through which filtered filtering gas is discharged and a first gas discharge pipe 123 for regulating the discharge of the filtering gas. A first discharge control valve 124 may be provided.

The second gas inlet pipe 125 branched from the suction pipe 111 is connected to the lower end of the second water tank 126 and connected to the second water tank 126 through the second gas inlet pipe 125 The introduced gas can be filtered through the water filled in the second water tank 126 and the zinc particles can be filtered.

The second water tank 126 is provided at its upper portion with a second gas discharge pipe 127 through which the filtering gas filtered with zinc particles is discharged and a second gas discharge pipe 127 through which zinc particles are filtered to control the discharge of the filtering gas A second discharge control valve 128 may be provided.

The second filtering line including the first filtering line including the first water tank 122 and the second water tank 126 as described above is connected through the flow control valve 129 to the suction pipe 111 and the first filtering line By connecting the gas inlet pipe 121 or the second gas inlet pipe 125, it is possible to filter the suctioned gas by using any one of the filtering lines for discharging, replacing, etc. contaminated water during the operation.

Here, the first water tank 122 is provided with a first water inlet pipe 122a through which water is introduced into the first water tank 122, a first water inlet control 122a through which water is introduced into the first water tank 122, A first water discharge pipe 122c for discharging the water of the first water tank 122 and a first water discharge control valve 122d for regulating water discharge of the first water tank 122, .

The second water tank 126 is provided with a second water inlet pipe 126a through which water is introduced into the second water tank 126 and a second water inlet control valve 126 through which water is introduced into the second water tank 126, A second water discharge pipe 126c for discharging the water of the second water tank 126, a second water discharge control valve 126d for regulating water discharge of the second water tank 126, and the like can do.

In addition, the first gas discharge pipe 124 and the second gas discharge pipe 128 may be combined into one line, and the filtering gas may be introduced into the water removal unit 130.

The water removing unit 130 removes the moisture of the discharged filtering gas and heats the filtered water through a heater provided inside the filtering unit so as to return the filtered water to the snout 2, Can be removed. Here, the heater used in the water removing unit 130 is variously disclosed in the related art, and a detailed description thereof will be omitted.

The re-injecting unit 140 may include a re-injection pipe 141, a plurality of re-injection holes 142, and the like, by re-introducing the filtering gas from which moisture has been removed into the Snart 2.

The reintroduction pipe 141 is provided so that one end thereof is connected to the water removing unit 130 and the other end passes through the inside and the outside of the snout 2 so as to be adjacent to the inside surface thereof. A plurality of re-injection holes 142 may be formed in the re-injection pipe 141 at a position adjacent to the re-injection pipe 141.

The re-charging pipe 141 is provided at an angle of about 40-50 DEG from the bath surface of the plating bath 3 so as to efficiently recycle the filtering gas into the upper space of the bath surface, and a plurality of re- May be formed at intervals of 5 to 10 mm.

The other end portion of the re-feed pipe 141 which passes through the inside and outside of the snout 2 and is provided adjacent to the inner side is branched into two re-feed pipes as shown in Fig. 3, However, it is needless to say that the upper and lower surfaces of the strip may be spaced apart from each other by a predetermined distance.

Accordingly, it is an object of the present invention to provide a method and apparatus for cleaning zinc dust by sucking vaporized gas from a bath surface of a plating bath in a Snart in an inert gas atmosphere to filter zinc particles, thereby preventing defects in the adhesion of the zinc generated from zinc contamination during hot- The surface quality of the plating product can be improved.

Further, according to the present invention, after the gasified gas is sucked from the bath surface in the Snart during hot-dip galvanizing, and the zinc particles contained in the sucked gas are filtered, the moisture of the discharged filtering gas is controlled and re- , It is possible to remove zinc pollutants generated in the process of hot dip galvanizing by the water tank method, so that no separate filter material is required, which is effective in terms of cost reduction. By constantly filtering the atmosphere gas in the Snart, So that the surface quality of the hot-dip galvanized product can be improved.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, It will be readily apparent that such substitutions, modifications, and alterations are possible.

110: gas suction part 120: filtering part
130: Water removal unit 140: Re-input unit

Claims (6)

A gas sucking portion for sucking a gas vaporized from the bath surface in a Snout during hot dip galvanizing;
A filtering unit for filtering the zinc particles contained in the sucked gas to discharge the filtering gas,
A water removing unit for removing water from the discharged filtering gas,
And a re-injection unit for re-introducing the filtering gas into which the moisture has been removed, into the snout,
Wherein the gas suction unit includes a suction pipe having a plurality of suction holes formed therein, the suction pipe being provided adjacent to the inner surface of the snout,
Wherein the reclosing portion is provided adjacent to an inner surface of the snout, the reclosing pipe having a plurality of re-
The suction pipe is provided at an angle of 40-50 DEG from the bath surface,
The plurality of suction holes are formed at intervals of 5-10 mm,
Wherein the re-introduction pipe is provided at an inclination of 40-50 from the bath surface,
Wherein the filtering unit filters the gas in a manner that the gas passes through the water tank using at least one water tank. delete delete delete delete delete

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