Furnace nose deslagging system and device for producing hot-dip coating

Abstract

The utility model discloses a furnace nose deslagging system and device for producing a hot-dip coating, and relates to the technical field of strip steel hot dipping, the furnace nose deslagging system comprises a furnace nose, a blowing and discharging mechanism and a negative-pressure material guiding and discharging mechanism, the air outlet end of the blowing and discharging mechanism extends into the furnace nose from one side of the furnace nose, and the air outlet end of the negative-pressure material guiding and discharging mechanism extends into the furnace nose from the other side of the furnace nose. The feeding end of the negative-pressure material guiding and discharging mechanism extends into the furnace nose from the other side of the furnace nose, the discharging end of the negative-pressure material guiding and discharging mechanism extends out of the furnace nose, the negative-pressure material guiding and discharging mechanism comprises a pneumatic slag discharging and guiding device, the first end of the pneumatic slag discharging and guiding device extends into the furnace nose from the other side of the furnace nose, and the second end of the pneumatic slag discharging and guiding device extends into the furnace nose from the other side of the furnace nose. And the second end of the pneumatic deslagging guide device extends out of the furnace nose. According to the furnace nose deslagging system for producing the hot-dip coating, through continuous operation of blowing, collecting and discharging, the liquid level in the furnace nose forms a stable flow direction, aluminum oxide dross is effectively discharged out of the furnace nose, the dross is prevented from being easily adhered to strip steel when the strip steel of the hot-dip coating is produced, and the surface hot-dip effect of the strip steel is good.

Description

Technical Field

[0001] The utility model relates to the technical field of strip steel hot-dip coating equipment, in particular to a furnace nose slag removal system for producing hot-dip coatings. Background Art

[0002] Hot dip galvanizing is abbreviated as hot dip galvanizing. Hot dip galvanizing is a process of immersing the plated part into molten metal liquid to form a metal coating on the surface. As an anti-corrosion coating product, hot dipped steel strip is widely used in automobiles, home appliances, construction and other fields.

[0003] In the existing production of hot-dip coated strip steel, the aluminum liquid on the inner surface of the aluminum boiler grate will continuously react with oxygen to form slag. When the strip steel is running, the surface tension balance of the aluminum liquid in the grate is destroyed. The slag on the surface of the aluminum liquid will approach the strip steel and adhere to the strip steel, thereby forming a slag sticking defect on the strip steel surface.

[0004] In view of this, it is necessary to provide a furnace nose slag removal system for producing hot dip coating to solve or at least alleviate the above-mentioned defects. Utility Model Content

[0005] The utility model provides a furnace nose slag removal system for producing hot-dip coated steel, which solves the technical problem that slag is easily adhered to the steel strip and slag sticking defects are formed on the steel strip surface during the existing production of hot-dip coated steel strip.

[0006] In order to achieve the above purpose, the technical solution adopted by the utility model is as follows:

[0007] A furnace nose slag removal system for producing hot-dip coatings, comprising a furnace nose, a purge discharge mechanism and a negative pressure material guiding and discharging mechanism, the purge discharge mechanism and the negative pressure material guiding and discharging mechanism are respectively arranged on both sides of the furnace nose, the air outlet end of the purge discharge mechanism extends from one side of the furnace nose into the furnace nose, the feed end of the negative pressure material guiding and discharging mechanism extends from the other side of the furnace nose into the furnace nose, the discharge end of the negative pressure material guiding and discharging mechanism extends out of the furnace nose, the negative pressure material guiding and discharging mechanism comprises a pneumatic slag removal guide, the first end of the pneumatic slag removal guide extends from the other side of the furnace nose into the furnace nose, and the second end of the pneumatic slag removal guide extends out of the furnace nose.

[0008] Furthermore, the purging and discharging mechanism includes an air blowing pipe, and an air blowing end of the air blowing pipe extends from one side of the furnace nose into the furnace nose.

[0009] Furthermore, the purge and discharge mechanism also includes a universal adjustment seat, the mounting end of which is fixedly mounted on the inner wall surface of the furnace nose, and the first end of the air blowing pipe passes through the side wall surface on one side of the furnace nose and is arranged on the adjustment positioning end of the universal adjustment seat.

[0010] Furthermore, the pneumatic slag discharge guide comprises a slag discharge guide pipe and an air injection pipe, and the air outlet end of the air injection pipe extends into the slag discharge guide pipe and is located at the output side of the slag discharge guide pipe.

[0011] Furthermore, the slag discharge guide pipe includes a U-shaped connecting section and a gradually expanding output section, the air outlet end of the air injection pipe extends into the U-shaped connecting section and is located on the output side of the U-shaped connecting section, the small diameter end of the gradually expanding output section is connected to the output end of the U-shaped connecting section, and the large diameter end of the gradually expanding output section extends outward.

[0012] Furthermore, the U-shaped connecting section and the gradually expanding output section are integrally formed.

[0013] Furthermore, the input side of the slag discharge guiding pipe is provided with a collecting bucket, and the output side of the slag discharge guiding pipe is provided with a liquid discharge head.

[0014] Furthermore, the slag discharge and material guiding pipe comprises a stainless steel outer cladding and an inner lining alumina coating, and the stainless steel outer cladding is coated on the inner lining alumina coating.

[0015] Furthermore, the jet pipe includes a first jet pipe section, a second jet pipe section and a third jet pipe section which are connected in sequence, the outlet end of the second jet pipe section is arranged through the output side of the bottom opening position of the U-shaped connecting section, the outlet end of the second jet pipe section is connected to the third jet pipe section, the third jet pipe section is coaxially arranged with the output side of the U-shaped connecting section, and the inlet end of the second jet pipe section is connected to the first jet pipe section.

[0016] The utility model also provides a device for producing hot-dip coating, comprising the above-mentioned furnace nose slag removal system for producing hot-dip coating.

[0017] The utility model has the following beneficial effects:

[0018] The utility model discloses a furnace nose slag removal system for producing hot-dip coated steel, comprising a furnace nose, a purge discharge mechanism and a negative pressure material guiding and discharging mechanism. The purge discharge mechanism is arranged on one side of the furnace nose, and the negative pressure material guiding and discharging mechanism is arranged on the other side of the furnace nose. When producing hot-dip coated steel strip, inert gas is blown into the furnace nose through the purge discharge mechanism, so that the upper aluminum liquid in the furnace nose flows stably to the other side, and the aluminum oxide slag follows the flow of the upper aluminum liquid and gathers to the other side of the furnace nose. Since the pneumatic slag discharge guide generates negative pressure at the output end of the pneumatic slag discharge guide, the aluminum slag returned under the adsorption effect of the negative pressure is sucked out of the furnace nose, so as to achieve the effect of cleaning the slag in the furnace nose. Through the continuous operation of blowing-collecting-discharging, the liquid surface in the furnace nose forms a stable flow direction, and the aluminum oxide slag is effectively discharged out of the furnace nose, so as to avoid the slag from easily adhering to the strip when producing hot-dip coated steel strip, and the hot-dip effect of the strip surface is good.

[0019] In addition to the above-described purposes, features and advantages, the present invention has other purposes, features and advantages. The present invention will be further described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The drawings constituting a part of this application are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0021] Figure 1 It is a top view of a furnace nose slag removal system for producing hot dip coating in one embodiment of the utility model;

[0022] Figure 2 yes Figure 1 A schematic diagram of a negative pressure material guiding and discharging mechanism;

[0023] Figure 3 yes Figure 2 Sectional view at AA in the middle;

[0024] Figure 4 yes Figure 3 Cross-sectional view at BB in the middle.

[0025] Description of Figure Numbers:

[0026] 100. Furnace nose deslagging system for producing hot-dip coating; 10. Furnace nose; 21. Blowing pipe;

[0027] 31. Pneumatic slag discharge guide; 311. Slag discharge guide pipe; 3111. U-shaped connecting section; 3112. Gradually expanding output section; 3113. Stainless steel outer layer; 3114. Lined with alumina coating; 312. Jet pipe;

[0028] 200. Strip steel to be processed. DETAILED DESCRIPTION

[0029] It should be understood that the specific embodiments described herein are only used to explain the present invention, and are not used to limit the present invention.

[0030] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0031] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back...) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0032] In addition, the descriptions of "first", "second", etc. in the present utility model are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in this field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

[0033] Through research, it is found that when producing hot-dip coated strip steel, the aluminum liquid on the inner surface of the aluminum boiler grate will continuously form slag with oxygen. When the strip steel is running, the surface tension balance of the aluminum liquid in the grate is destroyed. The slag on the surface of the aluminum liquid will approach the strip steel and adhere to the strip steel, thereby forming a slag defect on the surface of the strip steel. This defect is affected by factors such as the amount of slag content in the grate, the change of liquid surface tension, and the shaking of the strip steel. Therefore, the aluminum slag defect on the surface of the strip steel is now basically irregular and uncontrollable. In the existing hot-dip coating technology, the technology for controlling the cleanliness of aluminum liquid slag in the furnace nose mainly includes controlling the oxygen content in the furnace nose, inert gas in the furnace nose aluminum liquid drum, and electric centrifugal pump pumping; however, due to the high corrosiveness and high oxidizing property of aluminum liquid, the slag removal technology used in the galvanized furnace nose is not very effective in the aluminum pot. Specifically, because the oxygen content in the furnace nose is generally controlled below 20ppm and the strip steel temperature is controlled at 600-700℃, under this condition, the aluminum liquid easily reacts with oxygen to form aluminum oxide slag. At present, the oxygen content of the refined nitrogen introduced into the furnace is 1-2 ppm. In addition, the air tightness of the furnace nose is difficult to control, so the oxygen content in the furnace nose area cannot be controlled to the extent that it does not react with the aluminum liquid. The treatment method of simply blowing inert gas on one side of the furnace nose to gather the oxide slag on one side of the furnace nose is effective in a short period of time, but as aluminum atoms gather to form aluminum oxide slag, scum will form and contaminate the steel strip; the slag discharge method using an electric centrifugal pump, because aluminum liquid is highly corrosive, the centrifugal impeller will be corroded and fail during high-speed rotation, the centrifugal pressure will decrease, and the extraction effect will become worse. In addition, the electric centrifugal pump is expensive, cumbersome to install, and needs to be replaced frequently.

[0034] like Figure 1 , Figure 2 , Figure 3 and Figure 4As shown, the utility model provides a furnace nose slag removal system 100 for producing hot-dip coating, which performs hot-dip coating on the processed strip steel 200, including a furnace nose 10, a purge discharge mechanism and a negative pressure material guiding and discharging mechanism, the purge discharge mechanism and the negative pressure material guiding and discharging mechanism are respectively arranged on both sides of the furnace nose 10, the air outlet end of the purge discharge mechanism extends from one side of the furnace nose 10 into the furnace nose 10 for blowing air from the side of the furnace nose 10 into the furnace nose 10, the feed end of the negative pressure material guiding and discharging mechanism extends from the other side of the furnace nose 10 into the furnace nose 10, the discharge end of the negative pressure material guiding and discharging mechanism extends out of the furnace nose 10, the negative pressure material guiding and discharging mechanism includes a pneumatic slag discharge guide 31, the first end of the pneumatic slag discharge guide 31 extends from the other side of the furnace nose 10 into the furnace nose 10, and the second end of the pneumatic slag discharge guide 31 extends out of the furnace nose 10.

[0035] The utility model provides a furnace nose slag discharge system 100 for producing hot-dip coated steel, comprising a furnace nose 10, a purge discharge mechanism and a negative pressure material guide discharge mechanism. The purge discharge mechanism is arranged on one side of the furnace nose 10, and the negative pressure material guide discharge mechanism is arranged on the other side of the furnace nose 10. When producing hot-dip coated steel strip, the purge discharge mechanism blows inert gas into the furnace nose 10, so that the upper aluminum liquid in the furnace nose 10 flows stably to the other side, and the aluminum oxide slag follows the flow of the upper aluminum liquid and gathers To the other side of the furnace nose 10, since the pneumatic slag discharge guide 31 works at the output end of the pneumatic slag discharge guide 31 to generate negative pressure, the aluminum slag sent back under the adsorption effect of the negative pressure is sucked out of the furnace nose 10, thereby achieving the effect of cleaning the slag in the furnace nose 10; through the continuous operation of blowing-collecting-discharging, the liquid level in the furnace nose 10 forms a stable flow direction, and the alumina slag is effectively discharged from the furnace nose 10, thereby avoiding the slag from easily adhering to the strip when producing hot-dip coated strip, and the hot-dip effect of the strip surface is good.

[0036] It can be understood that the air blowing not only makes the aluminum liquid in the furnace nose 10 flow steadily and gathers the slag into the collecting bucket, but also continuously destroys the balance of the surface tension of the aluminum liquid in the furnace nose 10 to prevent the alumina slag from agglomerating.

[0037] It can be understood that in the present invention, a negative pressure material guiding and discharging mechanism is provided to discharge slag, and an electric centrifugal pump is not used to discharge slag. The Venturi principle is used to generate negative pressure on the output side of the negative pressure material guiding and discharging mechanism to finally assist in discharging the slag to the outside of the furnace nose 10, thereby avoiding the problem of corrosion and failure of the centrifugal impeller during high-speed rotation.

[0038] In a preferred embodiment of the present invention, the purge discharge mechanism and the negative pressure material guide discharge mechanism are relatively arranged on both sides of the furnace nose 10, and the purge discharge mechanism and the negative pressure material guide discharge mechanism are connected to the inner cavity of the furnace nose 10.

[0039] Further, the purge discharge mechanism includes an air blowing pipe 21, and the air blowing end extends from one side of the furnace nose 10 into the furnace nose 10. In a specific embodiment of the utility model, the purge discharge mechanism includes an air blowing pump and an air blowing pipe 21, the first end of the air blowing pipe 21 is connected to the air blowing pump, and the second end of the air blowing pipe 21 extends from one side of the furnace nose 10 into the furnace nose 10.

[0040] Furthermore, in order to facilitate the adjustment of the blowing direction, the purging and discharging mechanism also includes a universal adjustment seat, the mounting end of the universal adjustment seat is fixedly mounted on the inner wall surface of the furnace nose 10, and the first end of the blowing pipe 21 passes through the side wall surface on one side of the furnace nose 10 and is arranged on the adjustment positioning end of the universal adjustment seat.

[0041] More preferably, the negative pressure material guiding and discharging mechanism includes a pneumatic slag discharge guide 31 and a slag discharge pipe. The slag discharge pipe is arranged outside the furnace nose 10. The first end of the pneumatic slag discharge guide 31 extends from the other side of the furnace nose 10 into the furnace nose 10, and the second end of the pneumatic slag discharge guide 31 is connected to the slag discharge pipe.

[0042] Furthermore, the pneumatic slag discharge guide 31 includes a slag discharge guide pipe 311 and an air jet pipe 312, and the gas outlet end of the air jet pipe 312 extends into the slag discharge guide pipe 311 and is located at the output side of the slag discharge guide pipe 311. It can be understood that in the present invention, the air jet pipe 312 sprays gas in the slag discharge guide pipe 311, thereby generating a negative pressure on the output side of the slag discharge guide pipe 311, and under the auxiliary adsorption effect of the negative pressure, it is beneficial for the slag discharge guide pipe 311 to adsorb the floating slag and discharge it. Optionally, the air jet pipe 312 is used to spray nitrogen.

[0043] Furthermore, the slag discharge guide pipe 311 includes a U-shaped connecting section 3111 and a gradually expanding output section 3112. The gas outlet end of the gas jet pipe 312 extends into the U-shaped connecting section 3111 and is located at the output side of the U-shaped connecting section 3111. The small diameter end of the gradually expanding output section 3112 is connected to the output end of the U-shaped connecting section 3111, and the large diameter end of the gradually expanding output section 3112 extends outward. It can be understood that the gas outlet end of the gas jet pipe 312 extends into the output side of the bottom opening position of the U-shaped connecting section 3111, and the slag enters from the input side of the U-shaped connecting section 3111 due to gravity and flows to the bottom of the U-shaped connecting section 3111, and then the negative pressure generated by the bottom spraying airflow drives the slag upward to be discharged by auxiliary adsorption.

[0044] Furthermore, in order to ensure air tightness and structural stability, the U-shaped connecting section 3111 and the gradually expanding output section 3112 are integrally formed.

[0045] More preferably, the outer wall surface of the gas outlet end of the purge discharge mechanism is sealedly connected to the side wall surface of one side of the furnace nose 10, and the outer wall surface of the air injection pipe 312 is sealedly connected to the U-shaped connecting section 3111.

[0046] Further, the input side of the slag discharge material guide pipe is provided with a collecting bucket, and the output side of the slag discharge material guide pipe is provided with a liquid outlet head (gradually expanding output section). It can be understood that the liquid outlet head has a liquid outlet.

[0047] Furthermore, the bottom bending section of the U-shaped connecting section 3111 forms a siphon body structure. By designing the siphon body structure and applying the Venturi principle, the use of an electric centrifugal pump for slag discharge is avoided, and air diversion to accelerate the oxidation of the aluminum liquid is avoided.

[0048] Furthermore, the slag discharge guide pipe 311 includes a stainless steel outer layer 3113 and an inner lining alumina coating 3114, and the stainless steel outer layer 3113 is coated on the inner lining alumina coating 3114. The stainless steel outer layer 3113 adopts a 316L stainless steel layer, and the slag discharge guide pipe 311 for pumping out aluminum liquid adopts conventional 316L stainless steel and an inner lining of alumina ceramics, and the inner lining of alumina ceramics effectively prevents erosion and corrosion of aluminum liquid in the pipe, thereby increasing the service life and preventing the aluminum pot from being polluted.

[0049] Furthermore, in order to ensure the negative pressure slag removal effect, the air jet pipe 312 includes a first air jet pipe section, a second air jet pipe section and a third air jet pipe section connected in sequence, the air outlet end of the second air jet pipe section is arranged through the output side of the bottom opening position of the U-shaped connecting section 3111, the air outlet end of the second air jet pipe section is connected to the third air jet pipe section, the third air jet pipe section is coaxially arranged with the output side of the U-shaped connecting section 3111, and the air inlet end of the second air jet pipe section is connected to the first air jet pipe section. It can be understood that in the present invention, the air outlet of the second air jet pipe section is arranged upward.

[0050] The specific beneficial effects of the furnace nose slag removal system 100 for producing hot-dip coating provided by the utility model are as follows: a complete closed-loop slag removal system is formed by the cooperation of the purge discharge mechanism and the negative pressure material guide discharge mechanism, so as to achieve the purpose of cleaning the aluminum liquid slag in the furnace nose 10. The negative pressure material guide discharge mechanism uses the siphon principle, the Venturi principle and the cooperation of the stainless steel outer cladding 3113 and the inner lining alumina coating 3114 to ensure the dynamic stability, air tightness and pipeline corrosion resistance of the slag removal. During the specific operation, the inert gas is passed from one side of the furnace nose 10 to the furnace nose 10 through the blowing pipe 21, and the upper aluminum liquid in the furnace nose 10 forms a flow from one side to the other side, so that the slag is collected in the collection bucket of the slag discharge guide pipe 311. Under the action of negative pressure adsorption, the slag discharge guide pipe 311 discharges the aluminum liquid and slag in the collection bucket to the outside of the furnace nose 10, so as to achieve the effect of cleaning the aluminum liquid slag in the furnace nose 10.

[0051] The furnace nose slag removal system 100 for producing hot-dip coating provided by the utility model mainly has the following two innovative points: first, the traditional overflow slag removal is improved to active slag removal, which is more suitable for slag removal of aluminum liquid with high viscosity and poor fluidity; second, advanced functional ceramics are combined with traditional materials (the slag removal guide pipe 311 includes a stainless steel outer layer 3113 and an inner lining alumina coating 3114), and applied to the production of hot-dip aluminum plating. Nitrogen is used as the power source of negative pressure, which solves the problem of power source stability (impeller centrifugal pump is unstable after corrosion) compared with impeller centrifugal pumps; at the same time, it overcomes the difficulty that traditional materials are easily corroded in aluminum liquid, and provides a reliable and stable furnace nose 10 slag removal solution for hot-dip aluminum plating.

[0052] The utility model also provides a device for producing hot-dip coating, comprising the above-mentioned furnace nose slag removal system 100 for producing hot-dip coating.

[0053] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may be subject to various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A furnace nose deslagging system for producing hot dip coating, characterized in that: It includes a furnace nose, a purge and discharge mechanism, and a negative pressure material guiding and discharge mechanism, wherein the purge and discharge mechanism and the negative pressure material guiding and discharge mechanism are respectively arranged on both sides of the furnace nose. The gas outlet end of the purge discharge mechanism extends from one side of the furnace nose into the furnace nose, the feed end of the negative pressure material guide and discharge mechanism extends from the other side of the furnace nose into the furnace nose, and the discharge end of the negative pressure material guide and discharge mechanism extends out of the furnace nose. The negative pressure material guiding and discharging mechanism includes a pneumatic slag discharging guide, a first end of which extends from the other side of the furnace nose into the furnace nose, and a second end of which extends out of the furnace nose.

2. The furnace nose deslagging system for producing hot dip coating according to claim 1, characterized in that: The purge and discharge mechanism comprises an air blowing pipe, and an air blowing end of the air blowing pipe extends from one side of the furnace nose into the furnace nose.

3. The furnace nose deslagging system for producing hot dip coating according to claim 2, characterized in that: The purge and discharge mechanism also includes a universal adjustment seat, the mounting end of which is fixedly mounted on the inner wall surface of the furnace nose, and the first end of the air blowing pipe passes through the side wall surface of one side of the furnace nose and is arranged on the adjustment positioning end of the universal adjustment seat.

4. The furnace nose deslagging system for producing hot dip coating according to any one of claims 1 to 3, characterized in that: The pneumatic slag discharge guide comprises a slag discharge guide pipe and an air injection pipe, wherein the air outlet end of the air injection pipe extends into the slag discharge guide pipe and is located at the output side of the slag discharge guide pipe.

5. The furnace nose deslagging system for producing hot dip coating according to claim 4, characterized in that: The slag discharge guiding pipe comprises a U-shaped connecting section and a gradually expanding output section, the gas outlet end of the gas injection pipe extends into the U-shaped connecting section and is located at the output side of the U-shaped connecting section, the small diameter end of the gradually expanding output section is connected to the output end of the U-shaped connecting section, and the large diameter end of the gradually expanding output section extends outward.

6. The furnace nose deslagging system for producing hot dip coating according to claim 5, characterized in that: The U-shaped connecting section and the gradually expanding output section are integrally formed.

7. The furnace nose deslagging system for producing hot dip coating according to claim 5, characterized in that: The input side of the slag discharge and material guiding pipe is provided with a collecting bucket, and the output side of the slag discharge and material guiding pipe is provided with a liquid discharge head.

8. The furnace nose deslagging system for producing hot dip coating according to claim 5, characterized in that: The slag discharge guide pipe comprises a stainless steel outer cladding and an inner lining alumina coating, wherein the stainless steel outer cladding is coated on the inner lining alumina coating.

9. The furnace nose deslagging system for producing hot dip coating according to claim 5, characterized in that: The jet pipe comprises a first jet pipe section, a second jet pipe section and a third jet pipe section which are connected in sequence. The outlet end of the second jet pipe segment is arranged through the output side of the bottom opening position of the U-shaped connecting segment, the outlet end of the second jet pipe segment is connected to the third jet pipe segment, the third jet pipe segment is coaxially arranged with the output side of the U-shaped connecting segment, and the inlet end of the second jet pipe segment is connected to the first jet pipe segment.

10. A device for producing hot dip coating, characterized in that It comprises a furnace nose slag removal system for producing hot dip coating as described in any one of claims 1 to 9.

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