CN115595524A - Multifunctional furnace nose for strip steel galvanizing and zinc ash control method thereof - Google Patents

Multifunctional furnace nose for strip steel galvanizing and zinc ash control method thereof Download PDF

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Publication number
CN115595524A
CN115595524A CN202110778751.6A CN202110778751A CN115595524A CN 115595524 A CN115595524 A CN 115595524A CN 202110778751 A CN202110778751 A CN 202110778751A CN 115595524 A CN115595524 A CN 115595524A
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furnace nose
zinc liquid
zinc
motor
motor winding
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储双杰
侯晓光
杨建国
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Baoshan Iron and Steel Co Ltd
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Baoshan Iron and Steel Co Ltd
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    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/003—Apparatus
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/04—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the coating material
    • C23C2/06—Zinc or cadmium or alloys based thereon
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/34—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the shape of the material to be treated
    • C23C2/36—Elongated material
    • C23C2/40—Plates; Strips

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Coating With Molten Metal (AREA)

Abstract

The invention discloses a multifunctional furnace nose for strip steel galvanizing and a zinc ash control method thereof, and on the basis of the existing furnace nose, the furnace nose also comprises an enhanced overflow motor (7), a telescopic airflow baffle plate component and a micro-positive pressure air injection component; an enhanced overflow motor is arranged on the furnace nose body (1) through a notch above a zinc liquid level (11), the enhanced overflow motor comprises a long iron core (70) and a plurality of groups of motor windings which are wound on the long iron core and externally connected with a variable frequency power supply, and a magnetic field generated by the motor windings drives the zinc liquid level; the telescopic airflow baffle assembly and the micro-positive pressure air injection assembly are arranged on the furnace nose body. The invention improves the gravity overflow capacity of the zinc liquid by enhancing the overflow motor, reduces the formation of zinc ash particles by spraying the airflow baffle and the inert gas, avoids the zinc ash defect caused by the adhesion of the zinc ash particles directly falling onto the surface of the strip steel or the zinc ash particles falling onto the zinc liquid surface on the surface of the strip steel, and greatly improves the quality and the efficiency of the strip steel galvanizing production.

Description

Multifunctional furnace nose for strip steel galvanizing and zinc ash control method thereof
Technical Field
The invention relates to strip steel hot galvanizing equipment and a control method thereof, in particular to a multifunctional furnace nose for strip steel galvanizing and a zinc ash control method thereof.
Background
The typical process of modern hot galvanizing production is as follows: the strip steel is heated to the annealing temperature through the furnace section, cooled to a certain temperature through the cooling section, enters the zinc pot filled with high-temperature zinc liquid through an inclined furnace nose structure, and passes through the sink roll after the strip steel chemically reacts with the high-temperature zinc liquid to realize steering and vertically upwards discharge out of the zinc pot, so that the galvanizing process is completed. Among them, zinc ash defects are one of the typical quality problems in hot galvanizing production. The main components of the zinc ash are particles of Zn and ZnO, and the particles are formed by evaporating high-temperature zinc liquid, condensing the high-temperature zinc liquid on the wall surface of the furnace nose, falling to the surface of the zinc liquid and forming a ZnO film layer on the surface of the zinc liquid together in the furnace nose structure. The zinc ash is directly adhered to the surface of the strip steel or adhered to the surface of the strip steel through a sink roll to form zinc ash defects.
In order to solve the problem of the zinc ash defect of the strip steel, a plurality of solutions are provided in the prior art, and the most common and mature technical scheme applied at present comprises the following steps:
(1) Furnace nose humidification technology: namely, a humidifying nozzle is arranged in a structural cavity of the furnace nose, and inert gas containing certain moisture is continuously sprayed to the surface of zinc liquid in the furnace nose. The water vapor is decomposed into oxygen and hydrogen at high temperature, wherein the oxygen reacts with the zinc liquid to generate a thin ZnO film, so that the evaporation of the zinc liquid is reduced, the generation of zinc ash particles is greatly reduced from the source, and the defect of zinc ash is reduced. However, the furnace nose humidification technology has high requirements on the control of the dew point in the furnace nose, the defects of iron leakage and the like easily occur due to improper control, particularly, the defects of plating leakage on the surface of a product easily occur due to humidification of partial BH steel (baking hardened steel), high-strength steel and other steel types, and the humidification technology even can not be adopted under the condition of special high alloy components.
(2) Furnace nose wall surface heat preservation technology: the temperature of the wall surface is increased, the temperature difference between the wall surface and the evaporated zinc vapor is reduced, and the degree of the zinc vapor condensed into Zn particles on the wall surface is delayed, so that the Zn particles falling to the surface of the zinc liquid under the influence of unit vibration and the like are reduced, and the incidence rate of zinc ash defects is reduced. The furnace nose heat preservation technology is basically not influenced by galvanized products and processes and can be generally adopted.
(3) Furnace nose overflow technology: namely, the overflow groove is arranged at the nose tip of the furnace, and the zinc liquid pump continuously pumps the zinc liquid to control the fall between the zinc liquid level in the nose of the furnace and the zinc liquid level in the overflow groove, so that the zinc liquid level in the nose of the furnace can continuously overflow into the overflow groove like a waterfall curtain, and gravity overflow is formed. The zinc ash on the zinc liquid surface is pumped out along with the gravity overflow of the zinc liquid through a zinc liquid pump, thereby preventing the zinc ash from moving towards the strip steel and adhering to the surface of the strip steel to cause the defect of the zinc ash. However, the lip plate of the overflow groove is easy to deform and distort under the action of high temperature in the furnace nose, so that the overflow capacity of the overflow groove is insufficient, zinc ash cannot be timely and effectively discharged, and finally the occurrence rate of zinc ash defects of products is high.
Disclosure of Invention
One of the purposes of the invention is to provide a multifunctional furnace nose for strip steel galvanizing, which can make up the problem of insufficient gravity overflow capacity of an overflow trough in the prior art through different zinc liquid flooding modes, reduce the problem of zinc ash defect caused by zinc ash adhesion to the surface of strip steel, and is beneficial to improving the strip steel galvanizing production quality.
The invention also aims to provide a zinc ash control method for the multifunctional furnace nose for strip steel galvanizing, which can prevent zinc ash particles formed after zinc steam is condensed from directly falling onto the surface of strip steel, and quickly discharge the zinc ash particles falling to a zinc liquid surface out of an overflow groove through flow driving, thereby reducing the adverse effect of the zinc ash on strip steel production to the greatest extent and reducing the occurrence rate of zinc ash defects.
The invention is realized in the following way:
a multifunctional furnace nose for strip steel galvanizing comprises a furnace nose body, a humidifying nozzle, an overflow groove, a zinc liquid pump and a wall surface heat preservation device; the humidifying nozzle is arranged in the cavity structure of the furnace nose body, the overflow groove is arranged at the nose tip of the cavity structure of the furnace nose body, and the upper end of the overflow groove is flush with the surface of the zinc liquid level in the furnace nose body; the zinc liquid pump is connected to the bottom end of the overflow groove through a pipeline; the wall surface heat preservation device is arranged on the outer wall surface of the furnace nose body;
the multifunctional furnace nose for strip steel galvanizing further comprises an enhanced overflow motor, a telescopic airflow baffle plate component and a micro-positive pressure air injection component; a notch is formed on the furnace nose body and is positioned above the liquid level of the zinc, and the reinforced overflow motor is embedded in the furnace nose body through the notch; the reinforced overflow motor comprises a long iron core and a plurality of groups of motor windings wound on the long iron core; the motor winding is externally connected with a variable frequency power supply, so that a magnetic field generated by the motor winding drives the zinc liquid to flow on the zinc liquid surface; the telescopic airflow baffle assembly is arranged at the lower part of the furnace nose body and is positioned between the reinforced overflow motor and the wall surface heat preservation device; the micro-positive pressure air injection assembly is arranged on the furnace nose body and is electrically connected with the telescopic airflow baffle plate assembly;
the intersection point of the strip steel and the zinc liquid level is used as an original point, a vertical line which vertically faces upwards along the original point is used as a Z direction, the width direction of the strip steel is used as an X direction, and the Y direction is orthogonal to the Z direction and the X direction.
The plurality of groups of motor windings are sequentially arranged on the long iron core at intervals, each group of motor windings is provided with a plurality of magnetic poles, and the polarities of two adjacent magnetic poles are opposite, namely N poles and S poles are arranged in a staggered mode to form a rotating motor winding; when the rotating motor winding is electrified, the excitation field of the rotating motor winding rotates and generates an electromagnetic drive flow effect along the Y direction on the zinc liquid surface;
in the rotating motor windings, the number of magnetic poles of each group of motor windings is 4-6; the number M of the motor windings is determined by the width S of the cavity of the furnace nose body 0 And the tooth width T of the long iron core is determined, and the calculation formula is as follows: m = S 0 /((1～5) *T)。
The plurality of groups of motor windings are sequentially arranged on the long iron core at intervals to form linear motor windings, and the polarities of two adjacent groups of motor windings are opposite, namely N poles and S poles are arranged in a staggered mode; when the linear motor winding is electrified, the linear motor winding generates an electromagnetic flow driving effect on the zinc liquid level, and the electromagnetic flow driving direction is the extraction direction of the zinc liquid pump on the zinc liquid; in the linear motor winding, the number of the motor windings is 5-12 groups.
The plurality of groups of motor windings are sequentially arranged on the long iron core at intervals, and the polarities of the two adjacent groups of motor windings are opposite, namely N poles and S poles are arranged in a staggered mode to form linear motor windings; a plurality of groups of motor windings are sequentially arranged on the long iron core at intervals, each group of motor windings is provided with a plurality of magnetic poles, and the polarities of two adjacent magnetic poles are opposite, namely N poles and S poles are arranged in a staggered mode to form a rotating motor winding; the motor windings of the rotating motor windings and the motor windings of the linear motor windings are arranged in a staggered mode to form rotating linear mixed windings; when the rotating linear mixed winding is electrified, the motor winding generates electromagnetic flow driving action on the zinc liquid level, and the electromagnetic flow driving direction is the superposition direction of the zinc liquid pumping direction and the Y direction of the zinc liquid pump.
A first included angle is formed between the bottom surface of the long iron core and the liquid zinc surface, and the range of the first included angle alpha 1 is 0-45 degrees; a second included angle is formed between the length direction of the long iron core and the width direction of the strip steel, and the range of the second included angle alpha 2 is 0-15 degrees; a first distance is formed between the bottom surface of the long iron core and the zinc liquid surface along the Z direction, and the range of the first distance delta 1 is 3-100mm; and a second distance is formed between the long iron core and the plane where the strip steel is positioned along the Y direction, and the range of the second distance delta 2 is 3-100mm.
The telescopic airflow baffle plate assembly comprises an airflow baffle plate and a telescopic driving mechanism; the air flow baffle is arranged in a cavity of the furnace nose body in a retractable manner through the retractable driving mechanism, the air flow baffle is perpendicular to the wall of the cavity of the furnace nose body, and a vertical projection area of the maximum retractable amount of the air flow baffle on a zinc liquid surface is positioned between a vertical line and an overflow groove, namely the vertical projection area is not intersected with strip steel.
The micro-positive pressure gas injection assembly comprises a micro-positive pressure inert gas injection port and a micro-positive pressure and atmosphere concentration detection controller, wherein the micro-positive pressure and atmosphere concentration detection controller comprises a first pressure and concentration sensor, a second pressure and concentration sensor and a control unit; the micro-positive pressure inert gas injection port is arranged at the top of the cavity of the furnace nose body; the first pressure and concentration sensor and the second pressure and concentration sensor are respectively arranged at the top and the lower part of the cavity of the furnace nose body; the output end of the first pressure and concentration sensor and the output end of the second pressure and concentration sensor are respectively externally connected to the input end of the control unit, and the output end of the control unit is electrically connected with the telescopic airflow baffle plate assembly.
A zinc ash control method for a multifunctional furnace nose for strip steel galvanizing comprises the following steps:
step 1: the strip steel enters a cavity of the furnace nose body, inert gas is sprayed into the cavity of the furnace nose body by the micro-positive pressure gas spraying assembly and/or the humidifying nozzle, and the furnace nose body is subjected to heat preservation by the wall surface heat preservation device;
step 2: the micro-positive pressure gas injection assembly detects the pressure difference and concentration difference of zinc steam in the body cavity of the furnace nose, sets a pressure difference threshold and a concentration difference threshold, and controls the injection amount of inert gas according to the pressure difference threshold and the concentration difference threshold;
and 3, step 3: the telescopic airflow baffle assembly stretches according to the steam pressure difference, the component concentration difference, the pressure difference threshold value and the concentration difference threshold value, and prevents zinc steam in the cavity of the furnace nose body from rising and zinc ash from falling on a zinc liquid surface between the strip steel and the overflow groove;
and 4, step 4: and starting the enhanced overflow motor according to the humidifying state of the furnace nose body, wherein the magnetic field generated by a motor winding of the enhanced overflow motor drives the zinc liquid to flow on the zinc liquid surface, so that the zinc liquid with zinc ash is discharged from the overflow groove through the zinc liquid pump.
In the step 4, the process is carried out,
when the furnace nose body adopts the humidifying function, namely inert gas containing moisture is sprayed into the cavity of the furnace nose body through the humidifying nozzle, and the flow driving method for enhancing the zinc liquid level by the overflow motor comprises the following steps:
a plurality of groups of motor windings are arranged on the long iron core in a staggered manner to form a rotary motor winding, a linear motor winding or a rotary linear mixed winding;
when only the linear motor winding is adopted for driving flow, the working mode of the linear motor winding is intermittent working, namely the variable frequency power supply is powered on and powered off alternately, and electromagnetic driving flow along the direction of the zinc liquid pump for pumping the zinc liquid is formed;
when only the rotating motor winding is adopted for driving current, the working mode of the rotating motor winding is intermittent working, namely the power-on and the power-off of the variable frequency power supply are alternately carried out to form electromagnetic driving current along the Y direction;
when the flow driving of the rotary linear mixed winding is adopted, the rotary motor winding and the linear motor winding are simultaneously and intermittently electrified and driven, namely, the electrification and the outage of the variable frequency power supply are alternately carried out, and the electromagnetic flow driving which is overlapped along the extraction direction of the zinc liquid pump to the zinc liquid and the Y direction is formed;
when the furnace nose body does not adopt the humidifying function, namely the humidifying nozzle is not used, the telescopic airflow baffle component and the micro-positive pressure air injection component are started, and the flow driving method for enhancing the overflow motor to the zinc liquid level comprises the following steps: and the rotating motor winding is adopted for driving current, and the working mode of the rotating motor winding is continuous working, so that the electromagnetic driving current along the Y direction is formed.
When the enhanced overflow motor performs zinc liquid flooding, the penetration depth range of the magnetic field generated by the enhanced overflow motor to the zinc liquid is preferably 4-40mm, and the angular frequency control range of the variable frequency power supply is preferably 50-5000Hz.
Compared with the prior art, the invention has the following beneficial effects:
1. the invention has the advantages that the enhanced overflow motor is arranged, the motor winding controlled by the variable frequency power supply can form an electromagnetic flow driving effect on the zinc liquid surface, the gravity overflow capacity is greatly improved, the problem of insufficient overflow capacity caused by the deformation of an overflow groove lip plate and the like is solved, the high-efficiency discharge of zinc ash particles on the zinc liquid surface is ensured, the problem of zinc ash defect caused by the adhesion of the zinc ash particles on the surface of strip steel is avoided, and the quality of strip steel galvanizing production is improved.
2. The invention is provided with the rotary motor winding, the linear motor winding and the rotary linear mixed winding, and forms electromagnetic driving acting forces in different directions by combining the setting modes of the motor windings with different quantities and different arrangement forms and the control of parameters such as frequency adjustment, electrifying interval, electrifying time and the like of a variable frequency power supply, so that the penetration depth of a magnetic field to the zinc liquid is controllable, the production requirements of different furnace nose structures and different production processes are met, the stable driving of the zinc liquid is favorably realized, and the galvanizing production of strip steel is ensured.
3. The telescopic airflow baffle plate assembly is arranged, so that the rising of zinc steam evaporated at high temperature can be prevented through the expansion and contraction of the airflow baffle plate, the generation of zinc ash particles which are condensed on the inner wall of the cavity of the furnace nose body and fall on the surface of strip steel is reduced, the zinc ash particles fall on the zinc liquid surface under the shielding of the airflow baffle plate and are not contacted with the surface of the strip steel, the overflow discharge is facilitated, the zinc ash defect of the strip steel is further reduced, and the quality of the strip steel galvanizing production is improved.
4. The invention can inhibit the evaporation of zinc steam by spraying inert gas due to the micro-positive pressure gas injection assembly, thereby reducing the generation of zinc ash particles, reducing the occurrence of strip steel zinc ash defects and improving the quality of strip steel galvanizing production.
5. The invention can be used in combination with the gravity overflow, wall surface heat preservation and humidification functions in the prior art, realizes the flexible production of strip steel galvanizing by combining various modes of electromagnetic drive flow, airflow blocking and inert gas injection, has wide application range, expands the platability range of various steels and ensures the efficiency and quality of strip steel galvanizing production.
The invention improves the gravity overflow capacity of the zinc liquid by enhancing the overflow motor, ensures that zinc ash particles falling on the zinc liquid surface can be quickly discharged out of the overflow groove, avoids zinc ash defects caused by the adhesion of the zinc ash particles on the surface of strip steel, and simultaneously inhibits the rising of zinc steam by the telescopic control of the airflow baffle and the injection amount control of inert gas, thereby reducing the zinc ash particles formed by the condensation of the zinc steam on the inner wall of the cavity of the furnace nose body, avoiding the zinc ash defects caused by the direct falling of the zinc ash particles on the surface of the strip steel, and greatly improving the quality and efficiency of the strip steel galvanizing production.
Drawings
FIG. 1 is a side sectional view of a multi-purpose furnace nose for strip galvanizing in accordance with the present invention;
FIG. 2 is a side view of the installation of the enhanced overflow motor in the multi-functional furnace nose for strip galvanizing of the present invention (first included angle α 1=0 °);
fig. 3 is a top view of the installation of the enhanced overflow motor in the multifunctional furnace nose for strip galvanizing according to the present invention (second included angle α 2=0 °);
FIG. 4 is a side cross-sectional view of the rotary motor winding in the multi-function furnace nose for strip galvanization of the present invention;
FIG. 5 is a front view of the linear motor windings (6 sets of motor windings) in the multi-function furnace nose for strip galvanizing in accordance with the present invention;
FIG. 6 is a front view of the linear motor windings (12 groups of motor windings) in the multi-functional furnace nose for strip galvanizing in accordance with the present invention;
FIG. 7 is a front view of a rotating linear hybrid winding in a multifunctional furnace nose for strip galvanizing in accordance with the present invention;
FIG. 8 is a top view of the direction of electromagnetic drive current formed by the rotating linear hybrid winding in the multi-functional furnace nose for strip galvanizing in accordance with the present invention;
FIG. 9 is a side view of the installation of the enhanced overflow motor in the multifunctional furnace nose for strip galvanizing according to the present invention (first angle α 1 ≠ 0 °);
FIG. 10 is a top view of the installation of the enhanced overflow motor in the multi-functional furnace nose for strip galvanizing of the present invention (second included angle α 2 ≠ 0 °);
FIG. 11 is a control schematic diagram of the zinc ash control method of the multifunctional furnace nose for strip steel galvanizing according to the invention;
FIG. 12 is a control schematic diagram of an enhanced overflow motor in the zinc ash control method for a multi-functional furnace snout for strip galvanizing according to the present invention.
In the figure, 1 furnace nose body, 2 strip steel, 3 humidifying nozzles, 4 overflow chutes, 5 zinc liquid pumps, 6 wall surface heat preservation devices, 7 reinforced overflow motors, 70 long iron cores, 711 rotating motor windings, 712 linear motor windings, 8 air flow baffles, 81 telescopic driving mechanisms, 9 micro-positive pressure inert gas injection ports, 101 first pressure and concentration sensors, 102 second pressure and concentration sensors, 103 control units, 11 zinc liquid surfaces and 12 vertical lines.
Detailed Description
The invention is further described with reference to the following figures and specific examples.
Referring to the attached figure 1, the multifunctional furnace nose for strip steel galvanizing comprises a furnace nose body 1, a humidifying nozzle 3, an overflow groove 4, a zinc liquid pump 5 and a wall surface heat preservation device 6; the humidifying nozzle 3 is arranged in the cavity structure of the furnace nose body 1, the overflow groove 4 is arranged at the nose tip of the cavity structure of the furnace nose body 1, and the upper end of the overflow groove 4 is flush with the surface of the zinc liquid surface 11 in the furnace nose body 1; the zinc liquid pump 5 is connected to the bottom end of the overflow groove 4 through a pipeline, and the arrow direction in the figure is the zinc liquid flowing direction; the wall surface heat preservation device 6 is arranged on the outer wall surface of the furnace nose body 1.
The multifunctional furnace nose for strip steel galvanizing further comprises an enhanced overflow motor 7, a telescopic airflow baffle assembly and a micro-positive pressure air injection assembly; a notch is formed on the furnace nose body 1 and is positioned above the zinc liquid level 11, and the reinforced overflow motor 7 is embedded in the furnace nose body 1 through the notch; referring to fig. 2 and 3, the enhanced overflow motor 7 includes a long iron core 70 and a plurality of sets of motor windings wound around the long iron core 70; the motor winding is externally connected with a variable frequency power supply, so that a magnetic field generated by the motor winding drives the zinc liquid to flow on a zinc liquid surface 11; the telescopic airflow baffle plate component is arranged at the lower part of the furnace nose body 1 and is positioned between the reinforced overflow motor 7 and the wall surface heat preservation device 6; the micro-positive pressure air injection assembly is arranged on the furnace nose body 1 and is electrically connected with the telescopic airflow baffle plate assembly.
Referring to fig. 2 and 3, a coordinate system is established by taking the intersection point of the strip steel 2 and the molten zinc surface 11 as an origin, the direction of a perpendicular line 12 vertically upward along the origin is the Z direction of the coordinate system, the X direction of the coordinate system is the width direction of the strip steel 2, the Y direction of the coordinate system is the orthogonal direction of the Z direction and the X direction, and the Y direction is parallel to the molten zinc surface 11.
Referring to fig. 4, the plurality of groups of motor windings are sequentially disposed on the long iron core 70 at intervals, and each group of motor windings has a plurality of magnetic poles, and the polarities of two adjacent magnetic poles are opposite, that is, the N pole and the S pole are disposed alternately, to form a rotating motor winding 711. The rotating motor winding 711 corresponds to a conventional motor stator, the zinc liquid level 11 corresponds to a conventional motor rotor, and when the rotating motor winding 711 is supplied with alternating current with a certain frequency, an excitation field of the rotating motor winding 711 rotates counterclockwise and generates an electromagnetic drive flow effect on the zinc liquid level 11 along the Y direction, as shown by the arrow direction in fig. 4.
In the rotating motor winding 711, the number of magnetic poles of each group of motor windings is 4-6; preferably, 4-6 poles can be opposed toThe centers of the motor windings are symmetrically arranged or asymmetrically arranged, or are only arranged facing the zinc liquid level 11, and other arrangement modes can be adopted according to actual situations, which are not described herein again. In the X direction, the number M of the motor windings is determined by the width S of a cavity of the furnace nose body 1 0 And the tooth width T of the long core 70, the calculation formula is: m = S 0 /((1-5) × T), ensuring an enhanced uniformity of the overflow, the rotating motor windings 711, preferably 6-12 groups, create an electromagnetic driving action on the zinc surface 11 along the Y direction. When the width S of the cavity of the furnace nose body 1 0 1900mm, and a preferred dimension of the tooth width T is 100-300mm, the number M of motor windings can be 6-18 groups.
Preferably, the long iron core 70 of the rotary motor winding 711 may be an elongated iron core having a circular cross section.
Referring to fig. 5 and fig. 6, the plurality of groups of motor windings are sequentially arranged on the long iron core 70 at intervals to form the linear motor winding 712, and the polarities of two adjacent groups of motor windings are opposite, i.e., the N pole and the S pole are arranged alternately. Referring to fig. 5, the linear motor winding 712 corresponds to a conventional motor stator, the zinc liquid level 11 corresponds to a conventional motor rotor, and when the linear motor winding 712 is supplied with ac power with a certain frequency, the linear motor winding 712 generates an electromagnetic driving effect on the zinc liquid level 11, and the electromagnetic driving direction is a direction of drawing the zinc liquid by the zinc liquid pump 5, as shown by an arrow in fig. 5.
In the linear motor winding 712, the number of motor windings is 5 to 12, preferably 5, 6, 10 or 12.
Preferably, the long iron core 70 of the linear motor winding 712 may be an elongated iron core having a rectangular cross section.
Referring to fig. 7 and fig. 8, the plurality of groups of motor windings are sequentially arranged on the long iron core 70 at intervals, and the polarities of two adjacent groups of motor windings are opposite, that is, the N pole and the S pole are arranged alternately, so as to form a linear motor winding 712; a plurality of groups of motor windings are sequentially arranged on the long iron core 70 at intervals, each group of motor windings is provided with a plurality of magnetic poles, and the polarities of two adjacent magnetic poles are opposite, namely the N pole and the S pole are arranged in a staggered manner, so that a rotary motor winding 711 is formed; the motor windings of the rotary motor windings 711 are interleaved with the motor windings of the linear motor windings 712 to form a rotary-linear hybrid winding. When the rotating linear mixed winding is electrified with alternating current with a certain frequency, the motor winding generates electromagnetic flow driving action on the zinc liquid level 11, and the electromagnetic flow driving direction is the superposition direction of the zinc liquid pumping direction of the zinc liquid pump 5 and the Y direction.
Referring to fig. 9, preferably, a first included angle is formed between the bottom surface of the long iron core 70 and the zinc liquid surface 11, and the first included angle α 1 ranges from 0 ° to 45 °.
Referring to fig. 10, preferably, a second included angle is formed between the length direction of the long iron core 70 and the width direction of the steel strip 2, and the second included angle α 2 is in a range of 0 ° to 15 °.
Referring to fig. 2, preferably, a first distance is formed between the bottom surface of the long iron core 70 and the zinc liquid surface 11 along the Z direction, and the first distance δ 1 is in a range of 3-100mm.
Referring to fig. 3, 9 and 10, preferably, a second distance is formed between the long iron core 70 and the plane of the steel strip 2 along the Y direction, and the second distance δ 2 is preferably in the range of 3-100mm.
Through the control and adjustment of the first distance delta 1 and the second distance delta 2, the driving capacity and the action position of the driving flow can be influenced; the direction of the driving flow can be influenced by controlling and adjusting the first included angle alpha 1 and the second included angle alpha 2 so as to meet the driving flow requirement in the actual production process.
Referring to fig. 1, the retractable airflow baffle assembly includes an airflow baffle 8 and a retractable driving mechanism 81; airflow baffle 8 passes through the setting of flexible actuating mechanism 81 retractable in the die cavity of stove nose body 1, airflow baffle 8 is perpendicular with the die cavity wall of stove nose body 1, airflow baffle 8's the biggest flexible volume perpendicular projection region on zinc liquid level 11 is located between perpendicular line 12 and overflow launder 4, perpendicular projection region and belted steel 2 non-intersect promptly, guarantee to be blocked by airflow baffle 8 that the zinc ash granule that drops after the condensation can only fall to zinc liquid level 11 on, thereby zinc ash defect that the direct surface of belted steel 2 that falls of zinc ash granule leads to has been avoided. The telescopic driving mechanism 81 may adopt a rack and pinion type telescopic structure, a chain type telescopic structure, etc. controlled by a servo motor.
The micro-positive pressure gas injection assembly comprises a micro-positive pressure inert gas injection port 9 and a micro-positive pressure and atmosphere concentration detection controller, wherein the micro-positive pressure and atmosphere concentration detection controller comprises a first pressure and concentration sensor 101, a second pressure and concentration sensor 102 and a control unit 103; the micro-positive pressure inert gas injection port 9 is arranged at the top of the cavity of the furnace nose body 1; a first pressure and concentration sensor 101 and a second pressure and concentration sensor 102 are respectively arranged at the top and the lower part of the cavity of the furnace nose body 1; the output end of the first pressure and concentration sensor 101 and the output end of the second pressure and concentration sensor 102 are respectively connected to the input end of the control unit 103, and the output end of the control unit 103 is electrically connected with the telescopic driving mechanism 81 of the telescopic airflow baffle plate assembly. The first pressure and concentration sensor 101 and the second pressure and concentration sensor 102 form a pressure difference and a concentration difference from the detected pressure and concentration data, and input the pressure difference and the concentration difference data into the control unit 103, and a PLC inside the control unit 103 calculates the data to determine the extension length of the airflow baffle 8. The control unit 103 sends information to control the operation of the telescopic driving mechanism 81 through a frequency converter and a servo motor, so as to achieve the purpose of accurately and effectively controlling the telescopic length of the airflow baffle 8. The control unit 103 can also be used as an overall control device for coordinating and controlling the operation of each device of the present invention.
Preferably, a first pressure and concentration sensor 101 is positioned between the micro-positive pressure inert gas injection port 9 and the upper end of the wall surface heat preservation device 6 and is used for detecting the zinc vapor pressure and concentration at the top of the furnace nose body 1, a second pressure and concentration sensor 102 is positioned between the humidifying nozzle 3 and the telescopic airflow baffle component, and the humidifying nozzle 3 is positioned above the reinforcing overflow motor 7 and is used for detecting the zinc vapor pressure and concentration at the lower part of the furnace nose body 1, so that the zinc vapor pressure difference and concentration difference in the furnace nose body 1 are calculated.
Referring to fig. 1 and 11, a zinc ash control method for a multifunctional furnace nose for strip steel galvanizing is implemented based on the multifunctional furnace nose for strip steel galvanizing, and comprises the following steps:
step 1: the strip steel 2 enters a cavity of the furnace nose body 1, the micro-positive pressure air injection assembly and/or the humidifying nozzle 3 injects inert gas into the cavity of the furnace nose body 1 to inhibit the rising of zinc steam airflow, the furnace nose body 1 is insulated through the wall surface insulation device 6 to reduce the condensation of zinc steam on the inner wall surface of the cavity of the furnace nose body 1 to form zinc ash, and therefore the defect of the zinc ash generated when the zinc steam falls to the surface of the strip steel 2 is reduced. The inert gas sprayed into the furnace nose body 1 by the micro-positive pressure gas spraying component is consistent with the inert gas sprayed into the humidifying nozzle 3, such as nitrogen and the like.
According to the type of the strip steel 2, the production process requirement and the like, a micro-positive pressure air injection component and/or a humidifying nozzle 3 can be selected for humidifying, the humidifying function can be adopted during the production of most common steel types, the inert gas and the water vapor injected by the humidifying nozzle 3 are selected to be in a fixed proportion by the process, the humidifying function control of the humidifying nozzle 3 can adopt the prior art, and the details are not repeated here. And non-humidifying production can be selected according to the process requirements, for example, the humidifying function is not adopted in the production of BH steel.
And 2, step: the micro-positive pressure air injection assembly detects the pressure difference and the concentration difference of zinc steam in the cavity of the furnace nose body 1, sets a pressure difference threshold and a concentration difference threshold, and controls the injection amount of inert gas according to the pressure difference threshold and the concentration difference threshold.
Specifically, the pressure and concentration of zinc vapor at the top and lower part of the cavity of the furnace nose body 1 can be detected by the first pressure and concentration sensor 101 and the second pressure and concentration sensor 102, so as to obtain the pressure difference and concentration difference data in the cavity of the furnace nose body 1, and the pressure difference and concentration difference data are sent to the control unit 103.
The control unit 103 sets a pressure difference range threshold value in the cavity of the furnace nose body 1 to be 5-15%, when the pressure difference in the cavity of the furnace nose body 1 is greater than 15%, the control unit 103 starts the micro-positive pressure gas injection assembly, inert gas is injected into the cavity of the furnace nose body 1 through the micro-positive pressure inert gas injection port 9, and when the pressure difference in the cavity of the furnace nose body 1 is less than 5%, the control unit 103 closes the micro-positive pressure gas injection assembly. The micro-positive pressure gas injection assembly can adopt an intermittent gas injection mode to inject inert gas into the cavity of the furnace nose body 1 through the micro-positive pressure gas injection assembly to adjust the pressure range of zinc vapor in the cavity.
Similarly, the control unit 103 sets the threshold value of the concentration difference range in the cavity of the furnace nose body 1 to be 5-15%, when the concentration difference in the cavity of the furnace nose body 1 is greater than 15%, the control unit 103 starts the micro-positive pressure gas injection assembly, injects inert gas into the cavity of the furnace nose body 1 through the micro-positive pressure inert gas injection port 9, and when the concentration difference in the cavity of the furnace nose body 1 is less than 5%, the control unit 103 closes the micro-positive pressure gas injection assembly. The micro-positive pressure air injection assembly can adopt an intermittent air injection mode to inject inert gas into the cavity of the furnace nose body 1 through the micro-positive pressure air injection assembly to adjust the concentration range of zinc steam in the cavity.
The concentration difference and the pressure difference can be respectively used as the opening and closing conditions of the micro-positive pressure air injection assembly, and the concentration difference and the pressure difference can also be jointly used as the opening and closing conditions of the micro-positive pressure air injection assembly, so that the control precision is improved.
And 3, step 3: the telescopic airflow baffle plate component is telescopic according to the steam pressure difference, the component concentration difference, the pressure difference threshold value and the concentration difference threshold value, and the telescopic airflow baffle plate can prevent zinc steam in the cavity of the furnace nose body 1 from rising and enable zinc ash to fall on a zinc liquid surface 11 between the strip steel 2 and the overflow groove 4.
When the pressure difference in the cavity of the furnace nose body 1 is less than 5%, the control unit 103 drives the servo motor to operate, the servo motor drives the telescopic driving mechanism 81 to extend, so that the airflow baffle 8 extends into the cavity of the furnace nose body 1 from a zero position (i.e. the airflow baffle 8 does not extend out), the zero position of the airflow baffle 8 is located at the intersection point of the vertical line 12 and the inner wall of the cavity of the furnace nose body 1, and the extending length of the airflow baffle 8 is preferably 30-100mm away from the strip steel 2. When the pressure difference in the cavity of the furnace nose body 1 is increased to 5-15%, the control unit 103 drives the servo motor to operate and drives the airflow baffle 8 to return to the zero position, and in the process of resetting the airflow baffle 8, residual zinc particle condensate on the surface of the airflow baffle 8 can be scraped through relative sliding contact with the inner wall of the cavity of the furnace nose body 1. When the pressure difference in the cavity of the furnace nose body 1 is more than 15%, the airflow baffle 8 is kept at the zero position and is not moved.
Similarly, when the concentration difference in the cavity of the furnace nose body 1 is less than 5%, the control unit 103 drives the servo motor to operate, the servo motor drives the telescopic driving mechanism 81 to extend, so that the airflow baffle 8 extends into the cavity of the furnace nose body 1 from the zero position, and the extending length of the airflow baffle 8 is preferably 30-100mm away from the strip steel 2. When the concentration difference in the cavity of the furnace nose body 1 is increased to 5-15%, the control unit 103 drives the servo motor to operate and drives the airflow baffle 8 to return to the zero position, and in the process of resetting the airflow baffle 8, residual zinc particle condensate on the surface of the airflow baffle 8 can be scraped through relative sliding contact with the inner wall of the cavity of the furnace nose body 1. When the concentration difference in the cavity of the furnace nose body 1 is more than 15%, the airflow baffle 8 is kept at the zero position and is not moved.
The concentration difference and the pressure difference can be respectively used as the expansion and contraction conditions of the airflow baffle plate 8, and the concentration difference and the pressure difference can also be jointly used as the expansion and contraction conditions of the airflow baffle plate 8, so that the control precision is improved.
The depth control of the air baffle 8 of the telescopic air baffle assembly inserted into the cavity of the furnace nose body 1 is realized, the ascending air flow of zinc steam is enabled to be distributed in a reverse flow mode under the air baffle 8, zinc ash particles formed after the zinc steam is condensed on the air baffle 8 fall onto a zinc liquid level 11 between the strip steel 2 and the overflow groove 4, the zinc ash particles cannot fall onto the surface of the strip steel 2, the zinc ash particles can be rapidly discharged under the action of the enhanced overflow motor 7 and the zinc liquid pump 5, and the zinc ash defect caused by the fact that the zinc ash cannot be adhered to the surface of the strip steel 2 is guaranteed.
And 4, step 4: the reinforced overflow motor 7 is started according to the humidifying state of the furnace nose body 1, the magnetic field generated by the motor winding of the reinforced overflow motor 7 drives the zinc liquid to flow on the zinc liquid surface 11, and the zinc liquid with zinc ash is discharged from the overflow groove 4 through the zinc liquid pump 5.
When the enhanced overflow motor 7 drives the zinc liquid, the penetration depth delta range of the magnetic field generated by the enhanced overflow motor 7 to the zinc liquid is preferably 4-40mm, the zinc liquid level 11 can be stabilized, the stable driving flow is ensured, the stirring effect of the zinc liquid level 11 is prevented, and the control range of the angular frequency omega of the variable frequency power supply is preferably 50-5000Hz. The angular frequency of the variable frequency power supply has a relation formula with the skin depth
Figure BDA0003156838640000111
Wherein, omega is angular frequency, mu is magnetic conductivity of the zinc liquid, and sigma is electric conductivity of the zinc liquid, and the angular frequency and the penetration depth of the variable frequency power supply are coordinated according to the relational expression.
The magnitude of the exciting current can be adjusted according to the occurrence number of the zinc ash defects or the driving speed, the magnitude of the exciting current is influenced by the form of the servo motor to a certain extent, and the magnitude of the exciting current is preferably 10-200A.
According to the actual production process, namely whether the humidifying function is started or not, the enhanced overflow motor 7 with different winding forms is selected to meet the flow driving requirement and realize flexible production.
1. When the furnace nose body 1 adopts the humidifying function, namely inert gas containing moisture is sprayed into the cavity of the furnace nose body 1 through the humidifying nozzle 3, the flow driving method of the enhanced overflow motor 7 to the zinc liquid level 11 is as follows: the linear motor winding 712 is adopted for flow driving, the working mode of the linear motor winding 712 is intermittent working, namely, the variable frequency power supply is alternately powered on and powered off, and electromagnetic flow driving along the zinc liquid pumping direction of the zinc liquid pump 5 is formed; the long core 70 of the linear motor winding 712 has a longitudinal direction parallel to the width direction of the strip 2. When the long iron core 70 is installed in an inclined manner, namely the second included angle α 2 is not equal to 0 °, an inclined overflow effect can be achieved.
Example 1:
when the furnace nose body 1 adopts the humidifying function, the linear motor windings 712 are adopted for driving current, the number of the motor windings of the linear motor windings 712 is 5, the linear motor windings are arranged at intervals along the length direction of the long iron core 70 with the rectangular section, two groups of the motor windings are combined, the other three groups of the motor windings are combined, and a two-phase variable frequency power supply is adopted for outputting and supplying power. The length direction of the long iron core 70 of the linear motor winding 712 is parallel to the width direction of the strip steel 2, i.e. the second included angle α 2=0 °, and the long iron core 70 is parallel to the zinc liquid level 11, i.e. the first included angle α 1=0 °, and the first distance δ 1 and the second distance δ 2 are both preferably 30-70mm. The excitation direction of the motor winding is parallel to the center line of the long iron core 70, and the linear motor winding 712 generates a traveling wave magnetic field after being intermittently energized, and can generate electromagnetic driving force in the forward direction (i.e. along the direction of drawing the zinc liquid by the zinc liquid pump 5) and the reverse direction (i.e. along the direction opposite to the direction of drawing the zinc liquid by the zinc liquid pump 5) for the zinc liquid, so that the electromagnetic driving flow along the direction of drawing the zinc liquid by the zinc liquid pump 5 is realized.
Example 2:
referring to fig. 5, when the furnace nose body 1 adopts the humidifying function, the linear motor windings 712 are used for driving current, the number of the motor windings of the linear motor windings 712 is 6, and the linear motor windings are arranged at intervals along the length direction of the long iron core 70 with a rectangular cross section, wherein three groups of the motor windings are combined, and the other three groups of the motor windings are combined, and output power supply is performed by using a three-phase variable frequency power supply. The length direction of the long iron core 70 of the linear motor winding 712 is parallel to the width direction of the strip steel 2, i.e. the second included angle α 2=0 °, and the long iron core 70 is parallel to the zinc liquid level 11, i.e. the first included angle α 1=0 °, and the first distance δ 1 and the second distance δ 2 are both preferably 30-70mm. The excitation direction of the motor winding is parallel to the center line of the long iron core 70, and the linear motor winding 712 generates a traveling wave magnetic field after being intermittently energized, and can generate forward and reverse electromagnetic driving forces for the zinc liquid, thereby realizing electromagnetic flow driving along the extraction direction of the zinc liquid by the zinc liquid pump 5.
Example 3:
referring to fig. 6, when the furnace nose body 1 adopts the humidification function, the linear motor windings 712 are used for driving current, the number of the motor windings of the linear motor windings 712 is 12, and the linear motor windings are arranged at intervals along the length direction of the long iron core 70 with a rectangular cross section, wherein six groups of the motor windings are combined and adopt the three-phase variable frequency power supply output power supply of the first middle terminal box TB1 for supplying power, the other six groups of the motor windings are combined and adopt the three-phase variable frequency power supply output power supply of the second middle terminal box TB2 for supplying power, and the first middle terminal box TB1 and the second middle terminal box TB2 are connected to the variable frequency power supply S3; in each motor winding combination, a first motor winding and a fourth motor winding are connected with a U of a three-phase variable frequency power supply, a second motor winding and a fifth motor winding are connected with a V of the three-phase variable frequency power supply, and a third motor winding and a sixth motor winding are connected with a W of the three-phase variable frequency power supply. The length direction of the long iron core 70 of the linear motor winding 712 is parallel to the width direction of the strip steel 2, i.e. the second included angle α 2=0 °, and the long iron core 70 is parallel to the zinc liquid level 11, i.e. the first included angle α 1=0 °, and the corresponding first distance δ 1 and second distance δ 2 are preferably 30-70mm. The excitation direction of the motor winding is parallel to the center line of the long core 70, and after the linear motor winding 712 is intermittently energized, a traveling magnetic field is generated by the interaction of the first intermediate terminal box TB1 and the second intermediate terminal box TB2, and electromagnetic driving forces in the forward direction (indicated by arrow a in fig. 6), the reverse direction (indicated by arrow b in fig. 6), and the forward direction on one side and the reverse direction on the other side (indicated by arrow c in fig. 6) can be generated for the zinc liquid, thereby achieving electromagnetic driving in the direction of drawing the zinc liquid by the zinc liquid pump 5.
Example 4:
when the furnace nose body 1 adopts the humidifying function, namely inert gas containing moisture is sprayed into the cavity of the furnace nose body 1 through the humidifying nozzle 3, the flow driving method of the enhanced overflow motor 7 to the zinc liquid level 11 is as follows: the linear motor winding 712 is adopted for driving current, and the working mode of the linear motor winding 712 is intermittent working, namely, the power-on and the power-off are alternately carried out to form electromagnetic driving current along the Y direction; the long core 70 of the rotary motor winding 711 is installed obliquely, i.e. its length direction forms a second angle α 2 of 0 ° to 15 ° with the width direction of the strip steel 2, see fig. 10. The long iron core 70 is parallel to the zinc liquid level 11, i.e. the first included angle α 1=0 °, and the corresponding first distance δ 1 and second distance δ 2 are both preferably 30-70mm. Because the force-bearing area of the electromagnetic field acting on the zinc liquid is gradually reduced from left to right, the oblique overflow effect on the zinc liquid level 11 is formed as shown by arrows which are gradually reduced in the attached figure 10.
2. When the furnace nose body 1 adopts the humidifying function, namely inert gas containing moisture is sprayed into the cavity of the furnace nose body 1 through the humidifying nozzle 3, the flow driving method of the enhanced overflow motor 7 to the zinc liquid level 11 is as follows: the rotating motor winding 711 is adopted for driving flow, and the working mode of the rotating motor winding 711 is intermittent working, namely, the power-on and the power-off are alternately carried out to form electromagnetic driving flow along the Y direction; the length direction of the long core 70 of the rotary motor winding 711 and the width direction of the strip steel 2 form a second included angle alpha 2 of 0-15 degrees. When the long iron core 70 is installed in an inclined mode, namely the included angle alpha 2 is not equal to 0 degrees, an inclined overflow effect can be formed.
Example 5:
referring to fig. 4, when the furnace nose body 1 adopts the humidifying function, the rotating motor winding 711 is adopted for driving current, six groups of motor windings are arranged at intervals in sequence along the long iron core 70 with a circular section, six magnetic poles are symmetrically arranged on each group of motor windings in pairs in the circumferential direction, and the polarities of the six magnetic poles are staggered according to the N pole and the S pole. The first motor winding and the fourth motor winding are connected with the U of the three-phase variable frequency power supply, the second motor winding and the fifth motor winding are connected with the V of the three-phase variable frequency power supply, and the third motor winding and the sixth motor winding are connected with the W of the three-phase variable frequency power supply. The excitation direction of the motor winding is perpendicular to the center line of the long iron core 70, the rotating motor winding 711 generates a rotating magnetic field after being intermittently electrified, the rotation direction of the excitation field of the motor winding is in a counterclockwise single direction, electromagnetic driving force along the Y direction can be generated on the zinc liquid, and the direction is the same as the gravity overflow direction in the prior art. The length direction of the long iron core 70 of the rotating motor winding 711 is parallel to the width direction of the strip steel 2, i.e. the second included angle α 2=0 °, and the long iron core 70 is parallel to the zinc liquid level 11, i.e. the first included angle α 1=0 °, and the corresponding first distance δ 1 and the second distance δ 2 are preferably 30-70mm.
3. When the furnace nose body 1 adopts the humidifying function, namely inert gas containing moisture is sprayed into the cavity of the furnace nose body 1 through the humidifying nozzle 3, the flow driving method of the enhanced overflow motor 7 to the zinc liquid level 11 is as follows: the current is driven by adopting a rotating linear mixed winding, namely, a motor winding of a rotating motor winding 711 and a motor winding of a linear motor winding 712 are arranged on the long iron core 70 in a staggered manner, the working mode of the rotating linear mixed winding is intermittent working, namely, the power-on and the power-off are alternately carried out, and the rotating motor winding 711 and the linear motor winding 712 are respectively and independently supplied with power by a variable frequency power supply; electromagnetic drive current in the direction of drawing of the molten zinc by the molten zinc pump 5 is formed only when the linear motor winding 712 is intermittently energized with electric drive current; electromagnetic drive current in the Y direction is formed only when the rotary motor winding 711 is intermittently energized; when the rotary motor winding 711 and the linear motor winding 712 are simultaneously and intermittently electrified and driven to flow, electromagnetic driving flow which is overlapped with the Y direction along the extraction direction of the zinc liquid by the zinc liquid pump 5 is formed; the long core 70 of the rotary-linear hybrid winding has a length direction parallel to the width direction of the strip 2. When the long iron core 70 is installed obliquely, i.e. the second included angle α 2 ≠ 0, an oblique overflow effect can be formed.
Example 6:
referring to fig. 7 and 8, when the furnace nose body 1 adopts the humidifying function, the rotating linear mixed winding is adopted for driving flow, wherein the number of the motor windings of the linear motor winding 712 and the number of the motor windings of the rotating motor winding 711 are six, and the six motor windings are sequentially arranged in a staggered manner along the length direction of the long iron core 70 with the circular cross section, each motor winding of the rotating motor winding 711 is provided with six magnetic poles along the circumferential direction of the long iron core 70, and the polarities of the six magnetic poles are arranged in a staggered manner according to the N pole and the S pole. The length direction of the long iron core 70 is parallel to the width direction of the strip steel 2, i.e. the second included angle α 2=0 °, and the long iron core 70 is parallel to the zinc liquid level 11, i.e. the first included angle α 1=0 °, and the corresponding first distance δ 1 and second distance δ 2 are preferably 30-70mm.
In the linear motor winding 712, the first motor winding and the fourth motor winding are connected to U of the second three-phase variable frequency power source S2, the second motor winding and the fifth motor winding are connected to V of the second three-phase variable frequency power source S2, and the third motor winding and the sixth motor winding are connected to W of the second three-phase variable frequency power source S2. The excitation direction of the motor windings is parallel to the center line of the long core 70, and the linear motor windings 712 are separately energized intermittently to form an electromagnetic drive flow along the direction of drawing the molten zinc by the molten zinc pump 5, perpendicular to the gravity overflow direction in the prior art, as shown by the longitudinal arrows in fig. 8.
In the rotating motor winding 711, a first motor winding and a fourth motor winding are connected to U of the first three-phase variable frequency power source S1, a second motor winding and a fifth motor winding are connected to V of the first three-phase variable frequency power source S1, and a third motor winding and a sixth motor winding are connected to W of the first three-phase variable frequency power source S1. The excitation direction of the motor winding is perpendicular to the center line of the long iron core 70, and the rotating motor winding 711 is separately energized intermittently to form electromagnetic drive flow along the Y direction, which is the same as the gravity overflow direction in the prior art, as shown by the transverse arrow in fig. 8.
When the linear motor winding 712 and the rotary motor winding 711 are energized intermittently at the same time, the directions of electromagnetic drive currents generated are superimposed, and the resultant force is required to be controlled to be in the direction in which the molten zinc pump 5 pumps molten zinc and the Y direction are superimposed.
4. When the furnace nose body 1 does not adopt the humidifying function, namely the humidifying nozzle 3 is not used, the micro-positive pressure air injection component and the telescopic airflow baffle component can be started preferentially. Because the humidifying nozzle 3 is not started, the pressure difference and the concentration difference of zinc steam in the furnace nose body 1 gradually decrease from top to bottom, the pressure difference is less than 5 percent or even negative, the concentration difference is less than 5 percent or even negative, and according to the setting of the pressure difference threshold and the concentration difference threshold, the micro-positive pressure air injection assembly and the telescopic airflow baffle assembly can be automatically triggered to start at the moment until the pressure difference and the concentration difference meet the threshold range of 5-15 percent, and then the micro-positive pressure air injection assembly and the telescopic airflow baffle assembly are closed. The starting and closing modes of the micro-positive pressure air injection assembly are the same as those in the step 2, and the starting and closing modes of the telescopic airflow baffle assembly are the same as those in the step 3, so that the details are not repeated.
The flow driving method of the enhanced overflow motor 7 to the zinc liquid level 11 comprises the following steps: the rotating motor winding 711 is adopted for driving flow, the working mode of the rotating motor winding 711 is continuous working, and electromagnetic driving flow along the Y direction is formed; the long core 70 of the rotary motor winding 711 has a longitudinal direction parallel to the width direction of the strip 2. When the long iron core 70 is installed in an inclined manner, that is, the second included angle α 2 is not equal to 0 °, the stress area of the electromagnetic field acting on the zinc liquid is gradually reduced from left to right, as shown by the gradually shortened arrow in fig. 10, an inclined overflow effect on the zinc liquid surface 11 can be formed.
Example 7:
referring to fig. 4, when the furnace nose body 1 adopts the non-humidifying function, the rotating motor winding 711 is adopted for driving current, the number of six groups of motor windings is arranged at intervals along the length direction of the long iron core 70 with a circular section, six magnetic poles are symmetrically arranged on each group of motor windings in pairs along the circumferential direction of the long iron core 70, and the polarities of the six magnetic poles are arranged in a staggered manner according to the N pole and the S pole. The length direction of the long iron core 70 of the rotating motor winding 711 is parallel to the width direction of the strip steel 2, i.e., the second included angle α 2=0 °, the long iron core 70 is parallel to the zinc liquid level 11, i.e., the first included angle α 1=0 °, and the corresponding first distance δ 1 and second distance δ 2 are preferably 30-70mm. The first motor winding and the fourth motor winding are connected with a U of the three-phase variable frequency power supply, the second motor winding and the fifth motor winding are connected with a V of the three-phase variable frequency power supply, and the third motor winding and the sixth motor winding are connected with a W of the three-phase variable frequency power supply. The excitation direction of the motor winding is perpendicular to the center line of the long iron core 70, the rotating motor winding 711 generates a rotating magnetic field after being continuously electrified, the rotation direction of the excitation field of the motor winding is in a counterclockwise single direction, and electromagnetic driving force along the Y direction can be generated on the zinc liquid, and the direction is the same as the gravity overflow direction in the prior art.
Referring to fig. 12, when the enhanced overflow motor 7 is powered, the power-on interval and the power-on duration can be controlled in a certain alternating manner by manual presetting. Or a vision system is arranged on the side surface of the furnace nose to collect a zinc liquid level image, the zinc liquid level image is subjected to image segmentation, feature extraction, model training, zinc ash accumulation distribution calculation and other steps to carry out autonomous training learning, and a model of the enhanced overflow motor is established, so that full-automatic control over the energization interval time, the energization time length each time, the excitation current and the excitation frequency of the enhanced overflow motor 7 is realized, specific operation can be set according to actual production process requirements, and the detailed description is omitted here.
The present invention is not limited to the above embodiments, and therefore, any modifications, equivalents, improvements, etc. within the spirit and principle of the present invention should be included in the scope of the present invention.

Claims (10)

1. A multifunctional furnace nose for strip steel galvanizing comprises a furnace nose body (1), a humidifying nozzle (3), an overflow groove (4), a zinc liquid pump (5) and a wall surface heat preservation device (6); the humidifying nozzle (3) is arranged in a cavity structure of the furnace nose body (1), the overflow groove (4) is arranged at the nose tip of the cavity structure of the furnace nose body (1), and the upper end of the overflow groove (4) is flush with the surface of a zinc liquid surface (11) in the furnace nose body (1); the zinc liquid pump (5) is connected to the bottom end of the overflow groove (4) through a pipeline; the wall surface heat preservation device (6) is arranged on the outer wall surface of the furnace nose body (1);
the method is characterized in that: the multifunctional furnace nose for strip steel galvanizing also comprises an enhanced overflow motor (7), a telescopic airflow baffle plate component and a micro-positive pressure air injection component; a notch is formed on the furnace nose body (1), the notch is positioned above the zinc liquid level (11), and the reinforced overflow motor (7) is embedded in the furnace nose body (1) through the notch; the reinforced overflow motor (7) comprises a long iron core (70) and a plurality of groups of motor windings wound on the long iron core (70); the motor winding is externally connected with a variable frequency power supply, so that a magnetic field generated by the motor winding drives the zinc liquid to flow on a zinc liquid surface (11); the telescopic airflow baffle plate component is arranged at the lower part of the furnace nose body (1) and is positioned between the reinforced overflow motor (7) and the wall surface heat preservation device (6); the micro-positive pressure air injection assembly is arranged on the furnace nose body (1) and is electrically connected with the telescopic airflow baffle plate assembly;
the intersection point of the strip steel (2) and the zinc liquid surface (11) is taken as an original point, a vertical line (12) which is vertically upward along the original point is taken as a Z direction, the width direction of the strip steel (2) is taken as an X direction, and the Y direction is taken as a direction which is orthogonal to the Z direction and the X direction.
2. The multi-functional furnace nose for strip galvanizing of claim 1, characterized in that: the plurality of groups of motor windings are sequentially arranged on the long iron core (70) at intervals, each group of motor windings is provided with a plurality of magnetic poles, and the polarities of two adjacent magnetic poles are opposite, namely N poles and S poles are arranged in a staggered mode to form a rotary motor winding (711); when the rotary motor winding (711) is electrified, the excitation field of the rotary motor winding (711) rotates, and generates an electromagnetic drive flow effect on the zinc liquid surface (11) along the Y direction;
in the rotating motor winding (711), the number of magnetic poles of each group of motor windings is 4-6; the number M of the motor windings is determined by the width S of a cavity of the furnace nose body (1) 0 And the tooth width T of the long iron core (70), and the calculation formula is as follows: m = S 0 /((1～5)*T)。
3. The multi-functional furnace nose for strip galvanizing of claim 1, characterized in that: the plurality of groups of motor windings are sequentially arranged on the long iron core (70) at intervals to form a linear motor winding (712), and the polarities of the two adjacent groups of motor windings are opposite, namely the N poles and the S poles are arranged in a staggered manner; when the linear motor winding (712) is electrified, the linear motor winding (712) generates an electromagnetic flow driving effect on a zinc liquid surface (11), and the electromagnetic flow driving direction is the extraction direction of the zinc liquid pump (5) on the zinc liquid; in the linear motor winding (712), the number of the motor windings is 5-12 groups.
4. The multi-functional furnace nose for strip galvanizing as claimed in claim 1, wherein: the groups of motor windings are sequentially arranged on the long iron core (70) at intervals, and the polarities of the two adjacent groups of motor windings are opposite, namely N poles and S poles are arranged in a staggered mode to form a linear motor winding (712); a plurality of groups of motor windings are sequentially arranged on the long iron core (70) at intervals, each group of motor windings is provided with a plurality of magnetic poles, and the polarities of two adjacent magnetic poles are opposite, namely N poles and S poles are arranged in a staggered mode to form a rotating motor winding (711); the motor windings of the rotary motor windings (711) and the motor windings of the linear motor windings (712) are arranged in a staggered mode to form rotary linear mixed windings; when the rotating linear mixed winding is electrified, the motor winding generates electromagnetic flow driving action on the zinc liquid level (11), and the electromagnetic flow driving direction is the superposition direction of the zinc liquid pumping direction of the zinc liquid pump (5) to the zinc liquid and the Y direction.
5. The multi-functional furnace nose for strip galvanizing according to any one of claims 1 to 4, characterized in that: a first included angle is formed between the bottom surface of the long iron core (70) and the zinc liquid surface (11), and the range of the first included angle alpha 1 is 0-45 degrees; a second included angle is formed between the length direction of the long iron core (70) and the width direction of the strip steel (2), and the range of the second included angle alpha 2 is 0-15 degrees; a first distance is formed between the bottom surface of the long iron core (70) and the zinc liquid surface (11) along the Z direction, and the range of the first distance delta 1 is 3-100mm; and a second distance is formed between the long iron core (70) and the plane where the strip steel (2) is positioned along the Y direction, and the range of the second distance delta 2 is 3-100mm.
6. The multi-functional furnace nose for strip galvanizing of claim 1, characterized in that: the telescopic airflow baffle plate component comprises an airflow baffle plate (8) and a telescopic driving mechanism (81); the air flow baffle (8) is arranged in a cavity of the furnace nose body (1) in a telescopic mode through a telescopic driving mechanism (81), the air flow baffle (8) is perpendicular to the wall of the cavity of the furnace nose body (1), and a vertical projection area of the maximum telescopic quantity of the air flow baffle (8) on a zinc liquid surface (11) is located between a vertical line (12) and an overflow groove (4), namely the vertical projection area is not intersected with the strip steel (2).
7. The multi-functional furnace nose for strip galvanizing as claimed in claim 1, wherein: the micro-positive pressure gas injection assembly comprises a micro-positive pressure inert gas injection port (9) and a micro-positive pressure and atmosphere concentration detection controller, wherein the micro-positive pressure and atmosphere concentration detection controller comprises a first pressure and concentration sensor (101), a second pressure and concentration sensor (102) and a control unit (103); the micro-positive pressure inert gas injection port (9) is arranged at the top of the cavity of the furnace nose body (1); a first pressure and concentration sensor (101) and a second pressure and concentration sensor (102) are respectively arranged at the top and the lower part of a cavity of the furnace nose body (1); the output end of the first pressure and concentration sensor (101) and the output end of the second pressure and concentration sensor (102) are respectively connected to the input end of the control unit (103) in an external mode, and the output end of the control unit (103) is electrically connected with the telescopic airflow baffle plate assembly.
8. The zinc ash control method for the multi-functional furnace nose for strip galvanizing of claim 1, which is characterized in that: the method comprises the following steps:
step 1: the strip steel (2) enters a cavity of the furnace nose body (1), the micro-positive pressure air injection assembly and/or the humidifying nozzle (3) sprays inert gas into the cavity of the furnace nose body (1), and the furnace nose body (1) is insulated through a wall surface insulation device (6);
step 2: the micro-positive pressure gas injection assembly detects the pressure difference and the concentration difference of zinc steam in a cavity of the furnace nose body (1), sets a pressure difference threshold and a concentration difference threshold, and controls the injection amount of inert gas according to the pressure difference threshold and the concentration difference threshold;
and 3, step 3: the telescopic airflow baffle assembly is telescopic according to the steam pressure difference, the component concentration difference, the pressure difference threshold value and the concentration difference threshold value, and can prevent zinc steam in the cavity of the furnace nose body (1) from rising and enable zinc ash to fall on a zinc liquid level (11) between the strip steel (2) and the overflow groove (4);
and 4, step 4: starting the reinforced overflow motor (7) according to the humidification state of the furnace nose body (1), wherein a magnetic field generated by a motor winding of the reinforced overflow motor (7) drives the zinc liquid to flow on a zinc liquid surface (11), so that the zinc liquid with zinc ash is discharged from the overflow groove (4) through the zinc liquid pump (5).
9. The zinc ash control method of claim 8, wherein: in the step 4, the step of processing the image,
when the furnace nose body (1) adopts the humidifying function, namely, inert gas containing moisture is sprayed into the cavity of the furnace nose body (1) through the humidifying nozzle (3), and the flow driving method of the overflow motor (7) to the zinc liquid surface (11) is enhanced:
a plurality of groups of motor windings are arranged on the long iron core (70) in a staggered manner to form a rotary motor winding (711), a linear motor winding (712) or a rotary linear mixed winding;
when only the linear motor winding (712) is adopted for flow driving, the working mode of the linear motor winding (712) is intermittent working, namely the power-on and the power-off of the variable frequency power supply are alternately carried out, and electromagnetic flow driving along the zinc liquid pumping direction of the zinc liquid pump (5) is formed;
when only the rotating motor winding (711) is adopted for driving current, the working mode of the rotating motor winding (711) is intermittent working, namely the power-on and power-off of the variable frequency power supply are alternately carried out to form electromagnetic driving current along the Y direction;
when the rotating linear mixed winding is adopted for driving flow, the rotating motor winding (711) and the linear motor winding (712) are simultaneously and intermittently electrified and driven to flow, namely, the variable frequency power supply is electrified and powered off alternately, and electromagnetic driving flow superposed along the zinc liquid pumping direction and the Y direction of the zinc liquid pump (5) is formed;
when the furnace nose body (1) does not adopt the humidifying function, namely the humidifying nozzle (3) is not used, the telescopic airflow baffle component and the micro-positive pressure air injection component are started, and the flow driving method of the reinforced overflow motor (7) to the zinc liquid surface (11) comprises the following steps: the rotating motor winding (711) is adopted for driving flow, the working mode of the rotating motor winding (711) is continuous working, and electromagnetic driving flow along the Y direction is formed.
10. The zinc ash control method of claim 8, wherein: when the enhanced overflow motor (7) drives the zinc liquid, the penetration depth of the magnetic field generated by the enhanced overflow motor (7) to the zinc liquid is preferably in the range of 4-40mm, and the angular frequency of the variable frequency power supply is preferably in the range of 50-5000Hz.
CN202110778751.6A 2021-07-09 2021-07-09 Multifunctional furnace nose for strip steel galvanizing and zinc ash control method thereof Pending CN115595524A (en)

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