Device and method for improving ventilation cooling efficiency of tin bath bottom

Abstract

The invention discloses a device and method for improving the ventilation cooling efficiency of the bottom of a tin bath, the device for improving the ventilation cooling efficiency of the bottom of the tin bath comprises a first-stage flow dividing assembly, the first-stage flow dividing assembly comprises a first-stage flow dividing pipe, a plurality of second-stage flow dividing assemblies are connected to the top wall of the first-stage flow dividing pipe, and each second-stage flow dividing assembly comprises a second-stage flow dividing pipe; a plurality of cylindrical nozzles are connected to the top wall of each second-stage flow dividing pipe, a flow guiding body fixed to the lower surface of the groove bottom steel plate is arranged above each cylindrical nozzle, each flow guiding body is in a vertical horn shape, the size of an upper end opening of each flow guiding body is larger than that of a lower end opening of each flow guiding body, and a flow guiding air inlet is formed in the lower end opening of each flow guiding body; the upper portion of the wall body of the flow guiding body extends outwards and is attached to the groove bottom steel plate, and a plurality of flow guiding air outlets are formed in the periphery of the edge of the upper portion of the wall body of the flow guiding body. According to the invention, more cooling air sprayed from the cylindrical nozzles can participate in the heat exchange process with the tank bottom steel plate, and the temperature of the tank bottom high-temperature steel plate can be timely reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of float glass manufacturing, and in particular relates to a device and a method for improving the ventilation and cooling efficiency of a tin bath bottom. Background Art

[0002] The tin bath is a key forming equipment in the float glass manufacturing technology, in which 1050-1100℃ molten glass flows from the flow channel to the tin liquid surface in the tin bath, and is controlled by various auxiliary facilities to finally form a flat glass strip of required width and thickness. When the temperature drops to 600℃, it leaves the tin bath and enters the annealing kiln, and the temperature in the tin bath is always maintained at a high temperature of 600-1100℃. The bottom of the tin bath is composed of refractory bricks on the upper layer and steel plates on the lower layer. Part of the tin liquid directly contacts the steel plates at the bottom of the bath through the gaps between the refractory bricks at the bottom of the bath. Therefore, a cooling system for the tin bath bottom must be set to avoid the tin leakage caused by the accelerated erosion of the steel plates at the bottom of the bath when the bottom temperature is higher than 120℃.

[0003] In the ventilation and cooling system of the tin bath bottom, especially at the tin bath inlet section, the air supply method is particularly important in order to quickly and continuously cool the temperature of the steel plate at the bottom of the bath. At present, mechanical blowing is usually used for ventilation of the tin bath bottom, and cooling air is sent to the vicinity of the steel plate at the bottom of the bath through air ducts and diverter pipes. In engineering, vertical cylindrical nozzles are often set below the bottom of the bath, and cooling air is sprayed onto the steel plate at the bottom of the bath through the cylindrical nozzles to complete heat exchange. The cooling air mainly comes from untreated natural air, and the main factors affecting the heat exchange between air and the steel plate at the bottom of the bath are the flow rate and velocity of air flowing through the steel plate at the bottom of the bath. Therefore, increasing the flow rate and velocity of air flowing through the steel plate at the bottom of the bath plays a key role in reducing the temperature of the steel plate.

[0004] according to Figure 1 From the schematic diagram of the cylindrical nozzle jet below the bottom of the middle tank, it can be seen that the high-speed cooling wind ejected from the cylindrical nozzle 3 vertically impacts the surface of the high-temperature steel plate 7 at the bottom of the tank, and jet impact heat exchange occurs near the stagnation area. In the wall jet area, it flows along the lower surface of the steel plate 7 to complete the heat exchange. However, there is still a large amount of cooling wind that is reflected after hitting the steel plate 7 and does not directly participate in the heat exchange process, but only indirectly participates in the heat exchange process. Moreover, the cooling wind flow rate after reflection drops sharply, which is not ideal for reducing the temperature of the steel plate 7. In order to achieve the ideal cooling effect, it is necessary to increase the air volume of the fan and increase the flow rate of the cooling wind, which will seriously reduce the cooling efficiency of the ventilation cooling at the bottom of the tin tank. Figure 1 Area A in the middle represents the free jet area, area B represents the stagnation area, area C represents the wall jet area, and area F represents the reflection area. Summary of the invention

[0005] In view of the above-mentioned defects of the prior art, the present invention provides a device and method for improving the ventilation and cooling efficiency of the bottom of a tin bath. By setting a flow guide, the cooling air sprayed from the cylindrical nozzle can be more involved in the heat exchange process with the steel plate at the bottom of the bath, so that the temperature of the high-temperature steel plate at the bottom of the bath can be reduced in time, thereby slowing down the corrosion of the steel plate at the bottom of the bath by the tin liquid.

[0006] The technical solution adopted by the present invention to solve its technical problem is:

[0007] A device for improving the ventilation and cooling efficiency of a tin tank bottom comprises a primary flow diversion component arranged below the tin tank bottom, the primary flow diversion component comprises a primary flow diversion pipe, a plurality of secondary flow diversion components are connected to the top wall of the primary flow diversion pipe, the secondary flow diversion component comprises a secondary flow diversion pipe, a plurality of vertical cylindrical nozzles are connected to the top wall of each secondary flow diversion pipe, a guide body fixed at a corresponding position on the lower surface of a tank bottom steel plate is arranged above each of the cylindrical nozzles, the guide body is in a vertical trumpet shape and the upper end opening size is larger than the lower end opening size, the lower end opening of the guide body forms a guide air inlet, the upper part of the wall of the guide body expands outward and fits with the tank bottom steel plate, and a plurality of guide air outlets are opened around the upper edge of the wall of the guide body.

[0008] Furthermore, each of the flow guides is located directly above the corresponding cylindrical nozzle, and the upper part of the wall of the flow guide is continuously welded to the groove bottom steel plate.

[0009] Furthermore, the multiple air guide outlets of each of the guide bodies are evenly distributed around the upper edge of the wall of the corresponding guide body.

[0010] Furthermore, the first-level shunt pipe is horizontally arranged from front to back along the width direction of the bottom of the tin bath, and each of the second-level shunt pipes is horizontally arranged from left to right along the length direction of the bottom of the tin bath.

[0011] Furthermore, the first-level diverter tube is located directly below the bottom of the tin tank; the left-right horizontal spacing between the left end of each of the second-level diverter tubes and the left edge of the bottom of the tin tank is equal, and the left-right horizontal spacing between the right end of each of the second-level diverter tubes and the right edge of the bottom of the tin tank is equal, and the front-to-back horizontal spacing between two adjacent second-level diverter tubes is equal; the left-right horizontal spacing between two adjacent cylindrical nozzles on the top wall of each second-level diverter tube is equal.

[0012] Furthermore, the first-level diversion assembly also includes a first-level air inlet pipe, one end of the first-level air inlet pipe is used to connect with the air outlet of the fan, and the other end of the first-level air inlet pipe is connected to the first-level diversion pipe. The first-level air inlet pipe is equipped with a first-level air valve for adjusting the amount of cooling air entering the first-level diversion pipe.

[0013] Furthermore, the first-level air inlet pipe is vertical and the upper end is connected to the middle position of the bottom wall of the first-level diversion pipe.

[0014] Furthermore, the secondary diversion assembly also includes a secondary air inlet pipe, the lower end of the secondary air inlet pipe is connected to the corresponding position of the top wall of the primary diversion pipe and the upper end is connected to the corresponding bottom wall of the secondary diversion pipe, and a secondary air valve is installed on the secondary air inlet pipe for adjusting the amount of cooling air entering the corresponding secondary diversion pipe.

[0015] Furthermore, the secondary air inlet pipe is vertical and the upper end is connected to the middle position of the bottom wall of the corresponding secondary diversion pipe.

[0016] A method for improving the ventilation and cooling efficiency of the bottom of a tin bath, using the above-mentioned device for improving the ventilation and cooling efficiency of the bottom of a tin bath, specifically comprising:

[0017] The cooling air entering the first-level shunt pipe enters each of the second-level shunt pipes in turn, and the cooling air entering each of the second-level shunt pipes is ejected upward through each of the cylindrical nozzles. The cooling air ejected from each of the cylindrical nozzles is divided into two parts: one part is the cooling air entering the guide body from the guide air inlet of the guide body, and the other part is the cooling air not entering the guide body;

[0018] The cooling wind entering the guide body is concentrated to form two zones: one is the inner wall jet zone that flows through the inner wall of the guide body and the lower surface of the groove bottom steel plate under the action of the Coanda effect, and the other is the zone that directly collides with the groove bottom steel plate and then disperses to form a short stagnation zone. The cooling wind in the stagnation zone flows out through each of the guide air outlets along with the cooling wind in the inner wall jet zone under the action of the pressure difference, completing the heat exchange process with the groove bottom steel plate;

[0019] The cooling wind that has not entered the guide body is also concentrated to form two regional belts: one is the outer wall jet zone that flows through the outer wall of the guide body and the lower surface of the groove bottom steel plate under the action of the Coanda effect, and the other is the reflection zone. Through the setting of the guide body, the reflection angle of the reflected cooling wind in the reflection zone is increased, thereby increasing the air volume of the reflected cooling wind flowing with the cooling wind in the outer wall jet zone, so that more reflected cooling air flows rapidly with the cooling wind in the outer wall jet zone to complete the heat exchange process with the groove bottom steel plate.

[0020] Compared with the prior art, the beneficial effects of the present invention are:

[0021] The device for improving the ventilation and cooling efficiency of the bottom of the tin tank in the present invention comprises a first-level diversion component arranged below the bottom of the tin tank, the first-level diversion component comprises a first-level diversion pipe, a plurality of second-level diversion components are connected to the top wall of the first-level diversion pipe, the second-level diversion component comprises a second-level diversion pipe, a plurality of vertical cylindrical nozzles are connected to the top wall of each second-level diversion pipe, a guide body fixed at a corresponding position on the lower surface of the bottom steel plate of the tank is arranged above each cylindrical nozzle, the guide body is in a vertical trumpet shape and the upper end opening size is larger than the lower end opening size, the lower end opening of the guide body forms a guide air inlet, the upper part of the wall of the guide body expands outward and fits with the bottom steel plate of the tank, and a plurality of guide air outlets are opened around the upper edge of the wall of the guide body; in this way, the cooling air entering the first-level diversion pipe enters each second-level diversion pipe in turn, and the cooling air entering each second-level diversion pipe is ejected upward through each cylindrical nozzle respectively, and the cooling air ejected from each cylindrical nozzle is divided into two parts: one part enters from the guide air inlet of the guide body, and the other part enters from the guide air inlet of the guide body. The cooling wind that enters the guide body is concentrated to form two zones: one is the inner wall jet zone that flows through the inner wall of the guide body and the lower surface of the groove bottom steel plate under the action of the Coanda effect, and the other is the zone that disperses and forms a short stagnation zone after directly colliding with the groove bottom steel plate. The cooling wind in the stagnation zone flows out through each guide air outlet with the cooling wind in the inner wall jet zone under the action of the pressure difference, completing the heat exchange process with the groove bottom steel plate; the cooling wind that does not enter the guide body is also concentrated to form two zones: one is the outer wall jet zone that flows through the outer wall of the guide body and the lower surface of the groove bottom steel plate under the action of the Coanda effect, and the other is the reflection zone. Through the setting of the guide body, the reflection angle of the reflected cooling wind in the reflection zone is increased, thereby increasing the air volume of the reflected cooling wind flowing with the cooling wind in the outer wall jet zone, so that more reflected cooling wind flows rapidly with the cooling wind in the outer wall jet zone to complete the heat exchange process with the groove bottom steel plate. Therefore, without increasing the air volume of the fan or the cooling air flow rate, the cooling air ejected from the cylindrical nozzle, in the process of flowing through the corresponding flow guide body, can, under the action of the Coanda effect, enable more cooling air to participate in the heat exchange process with the steel plate at the bottom of the slot, thereby enabling the temperature of the high-temperature steel plate at the bottom of the slot to be reduced in time, so as to slow down the corrosion of the tin liquid on the steel plate at the bottom of the slot, thereby ensuring the sustainability of safe production.

[0022] In summary, the device for improving the ventilation and cooling efficiency of the tin bath bottom can greatly improve the ventilation and cooling efficiency of the tin bath bottom. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the jet flow of a cylindrical nozzle below the bottom of a tin bath in the background technology;

[0024] Figure 2 It is a structural schematic diagram of the device for improving the ventilation and cooling efficiency of the bottom of the tin bath in the present invention used in conjunction with the tin bath;

[0025] Figure 3 It is a schematic diagram of the jet flow of the cylindrical nozzle after the guide body is installed in the present invention;

[0026] Figure 4 for Figure 3 Schematic diagram of the top view of the structure of the intermediate flow conductor;

[0027] Figure 5 for Figure 3 Schematic diagram of the structure after the guide body is vertically flipped 180°.

[0028] Explanation of the reference numerals in the figure: 1. primary diverter pipe, 2. secondary diverter pipe, 3. cylindrical nozzle, 4. guide body, 401. guide air inlet, 402. guide air outlet, 5. secondary air valve, 6. secondary air inlet pipe, 7. steel plate, A. free jet zone, B. stagnation zone, C. wall jet zone, D. inner wall jet zone, E. outer wall jet zone, F. reflection zone. DETAILED DESCRIPTION

[0029] The specific embodiments of the present invention are further described in detail below in conjunction with the accompanying drawings. These embodiments are only used to illustrate the present invention, but not to limit the present invention.

[0030] In the description of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0031] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0032] Furthermore, in the description of the present invention, unless otherwise specified, “plurality” means two or more.

[0033] like Figure 2-Figure 5As shown, a device for improving the ventilation and cooling efficiency of the bottom of a tin tank comprises a first-level diversion component arranged below the bottom of the tin tank, the first-level diversion component comprises a first-level diversion pipe 1, a plurality of second-level diversion components are connected to the top wall of the first-level diversion pipe 1, the second-level diversion component comprises a second-level diversion pipe 2, a plurality of vertical cylindrical nozzles 3 are connected to the top wall of each second-level diversion pipe 2, a guide body 4 fixed at a corresponding position on the lower surface of a tank bottom steel plate 7 is arranged above each cylindrical nozzle 3, the guide body 4 is in a vertical trumpet shape and the upper end opening size is larger than the lower end opening size, the lower end opening of the guide body 4 forms a guide air inlet 401, the upper part of the wall of the guide body 4 expands outward and fits with the tank bottom steel plate 7, and a plurality of guide air outlets 402 are opened around the upper edge of the wall of the guide body 4.

[0034] In this way, the cooling air entering the primary branch pipe 1 enters each secondary branch pipe 2 in turn, and the cooling air entering each secondary branch pipe 2 is ejected upward through each cylindrical nozzle 3. Figure 3 As shown, the cooling air ejected from each cylindrical nozzle 3 is divided into two parts: one part is the cooling air entering the guide body 4 from the guide air inlet 401 of the guide body 4, and the other part is the cooling air not entering the guide body 4; the cooling air entering the guide body 4 is concentrated to form two regional belts: one is the inner wall jet zone flowing through the inner wall of the guide body 4 and the lower surface of the groove bottom steel plate 7 under the action of the Coanda effect, and the other is the cooling air in the stagnation zone after directly colliding with the groove bottom steel plate 7 and forming a short-term stagnation zone. The cooling air in the stagnation zone passes through each guide air outlet 4 under the action of the pressure difference along with the cooling air in the inner wall jet zone. 02 flows out, completing the heat exchange process with the bottom steel plate 7 of the slot efficiently; the cooling wind that has not entered the guide body 4 is also concentrated to form two regional belts: one is the outer wall jet zone that flows through the outer wall of the guide body 4 and the lower surface of the bottom steel plate 7 of the slot under the action of the Coanda effect, and the other is the reflection zone. Through the setting of the guide body 4, the reflection angle of the reflected cooling wind in the reflection zone is increased, thereby increasing the air volume of the reflected cooling wind flowing with the cooling wind in the outer wall jet zone, so that more reflected cooling wind flows rapidly with the cooling wind in the outer wall jet zone to complete the heat exchange process with the bottom steel plate 7 of the slot. Therefore, without increasing the air volume of the fan and the cooling wind flow rate, the cooling wind ejected from the cylindrical nozzle 3, in the process of flowing through the corresponding guide body 4, can, under the action of the Coanda effect, enable more cooling air to participate in the heat exchange process with the bottom steel plate 7 of the slot, thereby enabling the temperature of the high-temperature steel plate 7 of the bottom of the slot to be timely reduced, so as to slow down the erosion of the tin liquid on the bottom steel plate 7 of the slot, thereby ensuring the sustainability of safe production. Figure 3 Area A in the middle represents the free jet area, area B represents the stagnation point area, area D represents the inner wall jet area, area E represents the outer wall jet area, and area F represents the reflection area.

[0035] In one embodiment, each guide body 4 is located directly above the corresponding cylindrical nozzle 3. Figure 2 and Figure 3 This makes it easier for the cooling air ejected from the cylindrical nozzle 3 to enter the guide body 4; the upper wall of the guide body 4 is continuously welded to the groove bottom steel plate 7, and the weld is required to be flat and smooth without unevenness or burrs.

[0036] In one embodiment, the plurality of guide air outlets 402 of each guide body 4 are evenly distributed around the upper edge of the wall of the corresponding guide body 4. Figure 4 .

[0037] In one embodiment, the primary shunt tube 1 is horizontally arranged from front to back along the width direction of the bottom of the tin bath, and each secondary shunt tube 2 is horizontally arranged from left to right along the length direction of the bottom of the tin bath.

[0038] Among them, the first-level diverter tube 1 is located directly below the bottom of the tin tank; the left-right horizontal spacing between the left end of each second-level diverter tube 2 and the left edge of the tin tank bottom is equal, and the left-right horizontal spacing between the right end of each second-level diverter tube 2 and the right edge of the tin tank bottom is equal, and the front-to-back horizontal spacing between two adjacent second-level diverter tubes 2 is equal; the left-right horizontal spacing between two adjacent cylindrical nozzles 3 on the top wall of each second-level diverter tube 2 is equal.

[0039] The primary flow splitter assembly further includes a primary air inlet pipe, one end of which is used to be connected to the air outlet of the fan, and the other end of which is connected to the primary flow splitter pipe 1. A primary air valve is installed on the primary flow splitter pipe to adjust the amount of cooling air entering the primary flow splitter pipe 1. Preferably, the primary air inlet pipe is vertical and the upper end is connected to the middle position of the bottom wall of the primary flow splitter pipe 1.

[0040] Among them, Figure 2 As shown, the secondary flow splitter assembly further includes a secondary air inlet pipe 6, the lower end of which is connected to a corresponding position of the top wall of the primary flow splitter 1 and the upper end is connected to the bottom wall of the corresponding secondary flow splitter 2, and a secondary air valve 5 is installed on the secondary air inlet pipe 6 to adjust the amount of cooling air entering the corresponding secondary flow splitter 2. Preferably, the secondary air inlet pipe 6 is vertical and the upper end is connected to the middle position of the bottom wall of the corresponding secondary flow splitter 2.

[0041] A method for improving the ventilation and cooling efficiency of the bottom of a tin bath, using the above-mentioned device for improving the ventilation and cooling efficiency of the bottom of a tin bath, specifically comprising:

[0042] The cooling air entering the primary manifold 1 enters the secondary manifolds 2 in sequence, and the cooling air entering each secondary manifold 2 is ejected upward through each cylindrical nozzle 3. The cooling air ejected from each cylindrical nozzle 3 is divided into two parts: one part is the cooling air entering the guide body 4 from the guide air inlet 401 of the guide body 4, and the other part is the cooling air not entering the guide body 4.

[0043] The cooling wind entering the guide body 4 is concentrated to form two zones: one is the inner wall jet zone flowing through the inner wall of the guide body 4 and the lower surface of the groove bottom steel plate 7 under the action of the Coanda effect, and the other is the zone that directly collides with the groove bottom steel plate 7 and then disperses to form a short stagnation zone. The cooling wind in the stagnation zone flows out through each guide air outlet 402 under the action of the pressure difference along with the cooling wind in the inner wall jet zone, completing the heat exchange process with the groove bottom steel plate 7.

[0044] The cooling wind that has not entered the guide body 4 is also concentrated to form two area belts: one is the outer wall jet zone that flows through the outer wall of the guide body 4 and the lower surface of the groove bottom steel plate 7 under the action of the Coanda effect, and the other is the reflection zone. Through the setting of the guide body 4, the reflection angle of the reflected cooling wind in the reflection zone is increased, and then the air volume of the reflected cooling wind flowing with the cooling wind in the outer wall jet zone is increased, so that more reflected cooling air flows rapidly with the cooling wind in the outer wall jet zone to complete the heat exchange process with the groove bottom steel plate 7.

[0045] The present invention introduces a guide body 4 after jet analysis of the cylindrical nozzle 3 below the bottom of the tin tank, so that the air volume participating in the heat exchange with the high-temperature steel plate 7 at the bottom of the tank is increased, the temperature reduction of the high-temperature steel plate 7 at the bottom of the tank is accelerated, and the corrosion effect of the tin liquid seeping from the gaps between the refractory bricks at the bottom of the tank on the steel plate 7 at the bottom of the tank is reduced.

[0046] The present invention can greatly improve the ventilation and cooling efficiency of the tin bath bottom, and can further improve the safety and reliability in the float glass production process when the power and air volume of the fan remain unchanged.

[0047] The guide body 4 in the present invention is simple to construct and install, easy to operate, and is beneficial to improving the construction and installation efficiency of the ventilation of the bottom of the tin bath.

[0048] In summary, without increasing the air volume of the fan and the cooling air flow rate, the cooling air ejected from the cylindrical nozzle 3, in the process of flowing through the corresponding flow guide body 4, can, under the action of the Coanda effect, enable more cooling air to participate in the heat exchange process with the bottom steel plate 7 of the slot, thereby enabling the temperature of the high-temperature steel plate 7 at the bottom of the slot to be reduced in time, so as to slow down the corrosion of the tin liquid on the bottom steel plate 7 of the slot, thereby ensuring the sustainability of safe production.

[0049] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principles of the present invention. These improvements and substitutions should also be regarded as the scope of protection of the present invention.

Claims

1. A device for improving the ventilation and cooling efficiency of the bottom of a tin bath, Features: The invention comprises a primary flow diversion component arranged below the bottom of a tin bath, the primary flow diversion component comprising a primary flow diversion pipe (1), a plurality of secondary flow diversion components connected to the top wall of the primary flow diversion pipe (1), the secondary flow diversion components comprising a secondary flow diversion pipe (2), a plurality of vertical cylindrical nozzles (3) connected to the top wall of each secondary flow diversion pipe (2), a guide body (4) fixed at a corresponding position on the lower surface of a tank bottom steel plate (7) is arranged above each cylindrical nozzle (3), the guide body (4) is in a vertical trumpet shape and the upper opening size is larger than the lower opening size, the lower opening of the guide body (4) forms a guide air inlet (401), the upper wall of the guide body (4) expands outward and fits with the tank bottom steel plate (7), and a plurality of guide air outlets (402) are provided around the upper edge of the wall of the guide body (4).

2. A device for improving ventilation and cooling efficiency of the bottom of a tin bath according to claim 1, Features: Each of the flow guides (4) is located directly above the corresponding cylindrical nozzle (3), and the upper part of the wall of the flow guide (4) is continuously welded to the groove bottom steel plate (7).

3. A device for improving ventilation and cooling efficiency of the bottom of a tin bath according to claim 1, Features: The multiple flow guide air outlets (402) of each flow guide (4) are evenly distributed around the upper edge of the wall of the corresponding flow guide (4).

4. A device for improving ventilation and cooling efficiency of the bottom of a tin bath according to claim 1, Features: The first-level shunt pipe (1) is horizontally arranged from front to back along the width direction of the bottom of the tin bath, and each of the second-level shunt pipes (2) is horizontally arranged from left to right along the length direction of the bottom of the tin bath.

5. A device for improving the ventilation and cooling efficiency of the bottom of a tin bath according to claim 4, Features: The first-level diverter tube (1) is located directly below the bottom of the tin tank; the left-right horizontal spacing between the left end of each of the second-level diverter tubes (2) and the left edge of the bottom of the tin tank is equal, and the left-right horizontal spacing between the right end of each of the second-level diverter tubes (2) and the right edge of the bottom of the tin tank is equal, and the front-to-back horizontal spacing between two adjacent second-level diverter tubes (2) is equal; the left-right horizontal spacing between two adjacent cylindrical nozzles (3) on the top wall of each second-level diverter tube (2) is equal.

6. A device for improving the ventilation and cooling efficiency of the bottom of a tin bath according to claim 4, Features: The first-level flow distribution component also includes a first-level air inlet pipe, one end of which is used to be connected to the air outlet of the fan, and the other end of which is connected to the first-level flow distribution pipe (1). The first-level air inlet pipe is equipped with a first-level air valve for adjusting the amount of cooling air entering the first-level flow distribution pipe (1).

7. A device for improving ventilation and cooling efficiency of the bottom of a tin bath according to claim 6, Features: The first-level air inlet pipe is vertical and the upper end is connected to the middle position of the bottom wall of the first-level flow distribution pipe (1).

8. A device for improving the ventilation and cooling efficiency of the bottom of a tin bath according to claim 4, Features: The secondary flow splitter assembly further comprises a secondary air inlet pipe (6), the lower end of the secondary air inlet pipe (6) being connected to a corresponding position on the top wall of the primary flow splitter pipe (1) and the upper end being connected to the bottom wall of the corresponding secondary flow splitter pipe (2), and the secondary air inlet pipe (6) being provided with a secondary air valve (5) for adjusting the amount of cooling air entering the corresponding secondary flow splitter pipe (2).

9. A device for improving ventilation and cooling efficiency of the bottom of a tin bath according to claim 8, Features: The secondary air inlet pipe (6) is vertical and the upper end is connected to the middle position of the bottom wall of the corresponding secondary flow diversion pipe (2).

10. A method for improving the ventilation and cooling efficiency of a tin bath bottom, using a device for improving the ventilation and cooling efficiency of a tin bath bottom as claimed in any one of claims 1 to 9. It is characterized in that Specifically: The cooling air entering the first-level flow diversion pipe (1) enters each of the second-level flow diversion pipes (2) in sequence, and the cooling air entering each of the second-level flow diversion pipes (2) is ejected upward through each of the cylindrical nozzles (3). The cooling air ejected from each of the cylindrical nozzles (3) is divided into two parts: one part is the cooling air entering the guide body (4) from the guide air inlet (401) of the guide body (4), and the other part is the cooling air not entering the guide body (4); The cooling wind entering the guide body (4) is concentrated to form two zones: one is the inner wall jet zone that flows through the inner wall of the guide body (4) and the lower surface of the groove bottom steel plate (7) under the action of the Coanda effect, and the other is the zone that directly collides with the groove bottom steel plate (7) and then disperses to form a short-term stagnation zone. The cooling wind in the stagnation zone flows out through each of the guide air outlets (402) under the action of the pressure difference along with the cooling wind in the inner wall jet zone, completing the heat exchange process with the groove bottom steel plate (7); The cooling wind that has not entered the guide body (4) is also concentrated to form two zone belts: one is the outer wall jet zone that flows through the outer wall of the guide body (4) and the lower surface of the groove bottom steel plate (7) under the action of the Coanda effect, and the other is the reflection zone. Through the setting of the guide body (4), the reflection angle of the reflected cooling wind in the reflection zone is increased, thereby increasing the air volume of the reflected cooling wind flowing with the cooling wind in the outer wall jet zone, so that more reflected cooling air flows rapidly with the cooling wind in the outer wall jet zone to complete the heat exchange process with the groove bottom steel plate (7).

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