CN110846605A - Strip steel cooling device - Google Patents
Strip steel cooling device Download PDFInfo
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- CN110846605A CN110846605A CN201810956533.5A CN201810956533A CN110846605A CN 110846605 A CN110846605 A CN 110846605A CN 201810956533 A CN201810956533 A CN 201810956533A CN 110846605 A CN110846605 A CN 110846605A
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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
- C23C2/26—After-treatment
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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
- C23C2/04—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
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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
- C23C2/34—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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- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Heat Treatment Of Strip Materials And Filament Materials (AREA)
- Coating With Molten Metal (AREA)
Abstract
The invention relates to a strip steel cooling device, which comprises a movable cooling device and a fixed cooling device, wherein the movable cooling device consists of a movable air injection cooling section bellows, a plated flash cooling section bellows and an air conditioning air cooling section bellows; the cooling device is arranged from bottom to top, and is firstly cooled by an air box at an air conditioning air cooling section, an air box at a flash cooling section after plating and an air box at a movable air injection cooling section, and then is cooled by an air box at a fixed cooling section; the air-conditioning air cooling air bellow, the plated flash cooling section air bellow and the movable air injection cooling section air bellow are fixedly connected into a whole; according to the scheme, the fixed cooling section adopts the slot type nozzle to blow the inlet air to the surface of the strip steel at a high speed, so that the defects of uneven longitudinal chromatic aberration and the like in the surface cooling of the strip steel during the production of thicker strip steel are effectively overcome, and the high-pressure air is sprayed onto the strip steel to play a role in stabilizing the strip steel by injecting the slot type nozzle at an oblique angle and increasing the airflow distribution plates.
Description
Technical Field
The invention relates to a cooling device, in particular to a strip steel cooling device, and belongs to the technical field of mechanical structures.
Background
The aluminum-zinc plating technology in cold rolling plants is continuously developed, and the user requirements are higher and higher, wherein the size of spangles on the surface of a strip steel coating is required to reach the level of small spangles, and the number of the spangles is more than 10 centimeters and 55. Meanwhile, the thickness specification of the aluminum-zinc plated product is 0.4-2.0 mm, and the control difficulty of spangles is further increased for the product with the thickness specification of 2.3/2.5mm under the market demand.
The solidification process of the aluminum-zinc plating layer is not completed instantly, but is carried out in the temperature range of 565-381 ℃, and the small spangles with ideal size can be obtained only by effectively controlling the whole cooling solidification process.
Due to the factors of strip steel shaking, gas impact and vacant space, the actual cooling rate in the cooling range of 565-381 ℃ is low during thick material production, and the requirement of small spangles cannot be met. Therefore, a set of control method for forming the small spangles of the strip steel is urgently needed, and the control method can be suitable for controlling the coating spangles of products with the thickness of 0.4-2.5 mm.
The control of spangles is realized by arranging a primary fixed cooling air box section and a secondary fixed cooling air box section on a production line described in the specification of 'a split type quick cooling device for a hot-dip aluminum-zinc plating unit' in Chinese patent 201720908048.1 for searching; the specification of Chinese patent 200810234861.0 "hot-dip galvanized strip steel coating surface spangle generating device" describes an atomizing spray head assembling device with a combined structure; none of the technical solutions disclosed in the prior art can properly solve the above problems.
Disclosure of Invention
The invention provides a strip steel cooling device aiming at the technical problems in the prior art, and the scheme provides a method for controlling small spangles by a cooling device after strip steel of a hot-dip aluminum-zinc unit is discharged out of a zinc pot, and has the effect of solving the problem that the edge part of the strip steel is shaken and edge-wiped due to uneven airflow. The flash cooling section after plating has the functions of air injection cooling and spray cooling at the same time, and the switching of the air injection cooling and the spray cooling can be realized according to the process requirement. When the jet cooling is carried out, the air inlet turning plate of the flash cooling section after plating is opened and communicated with the movable jet cooling section at the upper part, and the slit-shaped nozzle sprays impact gas to the surface of the plating layer; when spray cooling is carried out, the air inlet turning plate of the flash cooling section is closed after plating and is separated from the upper movable air injection cooling section, fine-grained fog drops are sprayed out of the spray nozzles on the spray beams in the flash cooling section, atomized water vapor is diffused on the surface of the strip steel plating layer, and nucleation of the plating layer is increased. The fixed cooling section adopts a slot type nozzle to blow the inlet air to the surface of the strip steel at a high speed, thereby effectively overcoming the defects of uneven cooling of the surface of the strip steel, longitudinal chromatic aberration and the like when thicker strip steel is produced. And the high-pressure air is sprayed onto the strip steel by the oblique angle spraying of the slot type nozzle and the addition of the airflow distribution plate to play a role in stabilizing the strip steel.
In order to achieve the purpose, the technical scheme of the invention is as follows: a strip steel cooling device comprises a movable cooling device and a fixed cooling device, wherein the movable cooling device consists of a movable air jet cooling section air box, a plated flash cooling section air box and an air conditioner air cooling section air box; the strip steel is discharged out of the zinc pot and then vertically runs from bottom to top, so the cooling device is also arranged from bottom to top along with the running direction of the strip steel, and the strip steel firstly passes through an air conditioning air cooling section, a flash cooling section after plating and a movable air injection cooling section and then is cooled through a fixed cooling section; the air conditioner air cooling section, the plated flash cooling section and the movable air injection cooling section are fixedly connected into a whole.
The movable air injection cooling section is provided with 2 air boxes positioned on the upper surface side and the lower surface side of the strip steel, the air boxes are respectively provided with movable wheels, the wheels fall on a track, the air boxes are driven by a motor and can move above the zinc pot, and when the zinc pot is maintained, the spraying box can be pushed out of an operation line. The width of the bellows is 1500mm, the height is 8800mm, the nozzles on 2 bellows are slit-shaped, the number of nozzles is 10 rows respectively, the distance between the strip steel and the nozzles is 250mm, the longitudinal distance between the nozzles is 400mm, the slit-type nozzles are used for blowing the inlet air to the surface of the strip steel at high speed, and the defects of uneven cooling on the surface of the strip steel and the like during the production of thicker strip steel are effectively overcome.
During operation, cooling air is pumped into the air box from the open air through the filter by 2200 kW variable frequency fans, the air volume of the fans is 2 x 122000m3/h, the pressure is 4600Pa, and the blowing pressure of the air box can be adjusted.
The length of the flash cooling section air box after plating is 1500mm, the width is 520 mm, the height is 2500 mm, and the flash cooling section air box is respectively arranged at the upper part of the air conditioning air jet cooling spray box, and the lower part of the air jet cooling section air box is connected with the air jet cooling section air box into a whole; the flash cooling section bellows distributes and has 6 rows on the upper and lower surface side of belted steel, there is seam formula nozzle quantity on the bellows, and the nozzle is 150mm with belted steel distance, and nozzle interval are 400mm, and the nozzle height is 400mm, and nozzle length is 1500 mm.
The two groups of spray beams are arranged, the number of each group is 5, the interior of each spray beam is a hollow body, quick connectors are respectively connected to a compressed air pipe and a desalted water pipe at the end part of the transmission side of each spray beam, and the two groups of spray beams are respectively arranged between two air box seam type nozzles and are distributed on the upper surface side and the lower surface side of the strip steel; the spray beam both ends are passed through cardboard and screw fixation in bellows both sides, install the nozzle on every spray beam, and nozzle quantity has 7, and the nozzle is 250mm with belted steel distance, and spray beam interval are 400mm, and spray beam length is 1500mm, satisfies in the biggest specification belted steel width of product.
Compressed air and desalted water required by the spray beam are adjusted by the flow and pressure of a factory public auxiliary system and then are connected through a quick connector.
Desalted water is used as an atomization water source, the joint flow is 3 m3/h, and the joint pressure is greater than 0.2 MPa;
compressed air is used as an atomization air source, the joint flow is 700 Nm3/h, and the joint pressure is more than 0.5 MPa;
the data are obtained through experiments, and the capability of realizing small spangles on the surface of a thick material by double-sided spraying is verified and achieved; in order to prevent condensed water from dripping to the zinc pot, water receiving discs are arranged at the lower part of the flash cooling section air box and the upper part of the air conditioner cooling air box after plating, so that the condensed water can be conveniently received.
The flash cooling section after plating has the functions of air injection cooling and spray cooling at the same time, and the switching of the air injection cooling and the spray cooling can be realized according to the process requirement. When the air injection is cooled, the PLC controls an air inlet turning plate between the flash cooling section and the movable air injection cooling section after the plating to be opened, the air inlet turning plate is communicated with the movable air injection cooling section at the upper part, and the flash cooling air box nozzle sprays air to the surface of the plating layer; when spray cooling is needed, the PLC controls the air inlet turning plate of the flash cooling section to be closed after plating and is separated from the movable air injection cooling section on the upper portion, the PLC controls the valve table simultaneously, desalted water and compressed air with well-adjusted opening degree enter the spray beam in the flash cooling section, spray nozzles on the spray beam spray fine-grained fog drops, atomized water vapor spreads on the surface of the strip steel plating layer, the plating layer nucleation is increased, and the cooling method has an obvious effect of producing small spangles for products with the thickness of more than 0.6mm and less than 2.5 mm.
2 air conditioning air jet cooling spray boxes are additionally arranged at the bottom of the flash cooling section after plating and at the upper part of the zinc pot, the width of each spray box is 600mm, the height of each spray box is 500mm, each spray box is provided with 3 nozzles, the length of each nozzle is 1500mm, the maximum width of the strip steel is 1250mm, a pressure gauge and a thermometer are arranged in each spray box, the heat load calculation of air treatment is carried out according to the grasped field environment parameters, and 3 major factors of high temperature, large span and large temperature difference change of the treated air volume are considered; in the scheme, 5 totally-enclosed scroll compressors are selected as a refrigeration main machine (25 Hp multiplied by 3 + 12Hp multiplied by 2) to meet the change condition of 3 major factors. And each cold air spray box is provided with 1 cooling air cooler, and because the air supply temperature is too low due to the fact that the air supply temperature of the cooling air coolers is too low, the heat exchanger frosts and blocks an air flow channel, the air supply temperature of the cold air is determined to be 8-12 ℃ when the frosting critical point is met. As the section of the nozzle is a fixed value, in order to meet the requirement that the maximum air injection speed is more than or equal to 25m/s and less than or equal to 50m/s, and the ratio of the maximum cold air supply quantity to the minimum cold air supply quantity is 2:1, the maximum output air quantity of each air cooling air cooler is 10000m3/h and the minimum output air quantity is 5000m 3/h.
The air supply volume of each spray box is between 5700 and 9000 m3/h, the air injection volume of each nozzle is 1900 to 3000 m3/h, and the aim of controlling the air supply volume and the air injection volume is to bring away more than 20 percent of heat on the surface of the strip steel; the air injection temperature is less than or equal to 10 +/-2 ℃, and the purpose is to utilize low-temperature cold air injected by a slot nozzle to rapidly cool the surface of the strip steel to take away heat, increase the supercooling degree of liquid zinc on the surface of the strip steel, form more crystal nuclei in unit area under the action of the cold air, generate more spangles and ensure that the spangles do not grow to form small spangles; the air injection speed is 25-50 m/s, and the purpose is to facilitate the taking away of more than 50% of heat on the surface of the strip steel; when the air injection angle of the nozzle horizontally inclines downwards by 10-12 degrees, the test result meets the requirement that the air injection speed of the nozzle can approach 25m/s when the running speed of the strip steel is 2.5 m/s below the thickness specification of 0.6mm, thereby achieving the most beneficial effect; the distance between the nozzle and the aluminum-zinc-plated strip steel is 60mm +/-5 mm, and the aim is that the mixing temperature of cold air sprayed to the surface of the strip steel can be greatly reduced by shortening the distance between the nozzle and the strip steel;
the parameter setting aims to generate gas (about 9-12 ℃) at the temperature lower than the ambient temperature through air conditioning refrigeration, the gas is sprayed to the surface of the strip steel, and the effect of generating small spangles on products with the thickness of less than 0.6mm is obvious.
The width of the fixed cooling section bellows is 1500mm, the height is 5500mm, the fixed cooling section bellows is fixedly installed on a platform above the movable air jet cooling section, the coated strip steel enters the fixed cooling section after coming out from the movable air jet cooling section, and is subjected to air blast cooling by a variable frequency cooling fan with the power of 185 kw; 11 rows of the air box nozzles are arranged, the length of each nozzle is 1500mm, and the maximum specification of the width of the strip steel is 1500 mm; the nozzle is in a long and narrow slit shape, the opening of the nozzle is 10mm, and the nozzle aims to blow inlet air to the surface of the strip steel at a high speed, so that the defects of uneven cooling of the surface of the strip steel and the like during production of thicker strip steel can be effectively overcome.
The two air boxes are distributed on the upper surface side and the lower surface side of the strip steel, the strip steel is clamped between the two air boxes, the strip steel vertically runs from bottom to top, the distance between nozzles of the air boxes and the strip steel is 130mm, the depth of the nozzles is 260mm, the nozzles on the air boxes are arranged from bottom to top, the distances among the first row of nozzles, the second row of nozzles and the third row of nozzles are the same, the distances among the nozzles are 360mm, the nozzles are horizontally arranged, and the air flow sprayed by the nozzles is vertical to the surface of the strip; an included angle of 70 degrees is formed between a fourth row of nozzles and a third row of nozzles, the fourth row of nozzles are inclined upwards, an included angle of 70 degrees is formed between a fifth row of nozzles and a sixth row of nozzles, the fifth row of nozzles are inclined downwards, the distance between the fourth row of nozzles and the fifth row of nozzles is 360mm, inserting plate openings are respectively welded at positions 25mm away from the inner side of the edge of the fourth row of nozzles and the inner side of the edge of the fifth row of nozzles, an inserting plate with the thickness of 50mm is vertically inserted between the fourth row of nozzles and the fifth row of nozzles, the length of the inserting plate is 1500mm and the length of the nozzles is the same, 16 15mm flat steels are vertically welded on the outer side surface of the inserting plate, the flat steels are respectively spaced by 80mm, and the height of the flat steels is 330mm, so that the temperature of strip steel is high after the strip steel is discharged out of a zinc pot, the air flow sprayed by the nozzles reflects the; the flat steel also has the function that after the air flow sprayed out of the strip steel by the nozzle rebounds back to the surface of the vertical inserting plate, the air flow can be diffused towards the two sides of the inserting plate, the equidistant flat steel blocks the air flow diffusion, and the air flow is guided and distributed.
Vertical picture peg and operation belted steel surface parallel, two air curtain faces about the formation are spouted to fourth row tilt up nozzle mouth and the blowout of fifth row downward sloping nozzle mouth high-pressure draught on the belted steel, the air current that rebounds back from the belted steel surface meets vertical picture peg again and rebounds, a trapezoidal air field pad has been formed between picture peg and the belted steel surface, it depends on the belted steel surface to be equivalent to a buffering shock pad, the upper and lower surface of in service belted steel receives this trapezoidal air field pad effect respectively, make belted steel operation more stable, avoided belted steel limit portion to receive the uneven influence of air current and take place the shake, off tracking bumps and rubs bellows, influence product quality.
The distance between the nozzles in the sixth row and the seventh row is the same, the distance between the nozzles is 360mm, the nozzles are horizontally arranged, and the air flow sprayed out by the nozzles is vertical to the surface of the strip steel; an included angle of 70 degrees is formed between the eighth row of nozzles and the seventh row of nozzles, the eighth row of nozzles are inclined upwards, an included angle of 70 degrees is formed between the ninth row of nozzles and the tenth row of nozzles, the ninth row of nozzles are inclined downwards, the distance between the eighth row of nozzles and the ninth row of nozzles is 360mm, inserting plate openings are respectively welded at positions 25mm away from the inner side of the opening edge of the eighth row of nozzles and the inner side of the opening edge of the ninth row of nozzles, a 50mm thick inserting plate is vertically inserted between the eighth row of nozzles and the ninth row of nozzles, and a trapezoidal air field cushion is formed between the inserting plate and the surface of the strip steel as the air flow sprayed by the fourth row of nozzles and the fifth row of inclined nozzles;
the distance between the tenth row of nozzles and the eleventh row of nozzles is the same, the distance between the nozzles is 360mm, the nozzles are horizontally arranged, and the air flow sprayed out by the nozzles is vertical to the surface of the strip steel;
the strip steel runs from bottom to top, is cooled by 7 nozzles perpendicular to the strip steel and 4 inclined nozzles, and the surface temperature of the strip steel is rapidly cooled under the action of two air field cushions formed by the inclined nozzles in the fourth row, the fifth row, the eighth row and the ninth row, and the strip steel runs more stably, so that the phenomenon that the edge of the strip steel is shaken to rub an air box due to uneven air flow is avoided, and the product quality is influenced. The strip steel cooling device and the control method are applied to a production line, so that the problem of small spangles of a coating of a product with the thickness of 0.4-2.5 mm is solved, the surface temperature of strip steel is rapidly cooled, the running of the strip steel is more stable, and the phenomenon that the edge of the strip steel is affected by uneven airflow to shake and rub an air box to influence the product quality is avoided.
Compared with the prior art, the invention has the following advantages: the fixed cooling section of this scheme adopts the slot nozzle to blow the air inlet to belted steel surface at a high speed, effectively overcome when the production is thick belted steel, defect phenomena such as the inhomogeneous longitudinal chromatic aberration of belted steel surface cooling appear, and spray and increase the air current subdivision board through the slot nozzle oblique angle and guarantee that high pressure's air sprays and play the stable belted steel effect on the belted steel, the little spangle control of cladding material of 0.4 to 2.5mm thickness specification product has been solved to this scheme, make belted steel surface temperature obtain quick cooling, and belted steel operation is more stable, avoided belted steel limit portion to receive the inhomogeneous influence of air current and take place the shake to bump and wipe bellows, influence product quality's problem.
Drawings
FIG. 1 is a schematic side view of a mobile cooling device.
FIG. 2 is a schematic side view of a stationary cooling unit.
In the figure: 1-moving an air box of an air injection cooling section; 11-slot nozzle, 2-flash cooling segment air box after plating, 21-slot nozzle; 22-spray beam, 23-spray nozzle, 24-clamping plate; 25-compressed air pipe; 26-a desalted water pipe; 27-a water pan; 3-air conditioning air jet cooling spray box; 31-slot nozzle; 32-air conditioning air cooling pipe; 4-fixed cooling section windbox, 41-first row of nozzles, 42-second row of nozzles; 43-third row of nozzles, 44-fourth row of nozzles, 441-card port; 442-plug board; 443-flat steel; 45-fifth row of nozzles; 46-sixth row of nozzles; 47-sixth row of nozzles; 48-eighth row of nozzles, 481-plugboard openings; 482-inserting plate; 49-ninth row of nozzles; 50-tenth row of nozzles and 51-eleventh row of nozzles.
Detailed Description
For the purposes of promoting an understanding and appreciation of the invention, reference will now be made to the following detailed description of the invention taken in conjunction with the accompanying drawings.
Example 1: referring to fig. 1, a strip steel cooling device comprises a movable cooling device and a fixed cooling device, wherein the movable cooling device consists of a movable air jet cooling section bellows, a plated flash cooling bellows section and an air conditioning air cooling section bellows, and the fixed cooling device consists of a fixed bellows 4 and a cooling fan (not shown in the figure); the strip steel is discharged from the zinc pot and then vertically runs from bottom to top, so the cooling device is also arranged from bottom to top along with the running direction of the strip steel, and the strip steel firstly passes through an air conditioning air cooling section air box 3, a plated flash cooling section air box 2 and a movable air jet cooling section air box 1 and then is cooled by a fixed cooling section air box 4; the air conditioner air cooling air bellow 3, the plated flash cooling section air bellow 2 and the movable air injection cooling section air bellow 1 are fixedly connected into a whole.
The movable air injection cooling section is provided with 2 air boxes 1 which are positioned on the upper surface side and the lower surface side of the strip steel, the air boxes 1 are respectively provided with movable wheels (not shown in the figure), the wheels fall on a track, the air boxes are driven by a motor and can move above a zinc pot, and a spray box can be pushed out of an operation line when the zinc pot is maintained. The width of the air box 1 is 1500mm, the height is 8800mm, the nozzles on 2 air boxes are in the shape of long and narrow slits, the number of the nozzles 11 is respectively 10 rows, the distance between the strip steel and the nozzles 11 is 250mm, the longitudinal distance between the nozzles is 400mm, the slot nozzles 11 are adopted to blow the inlet air to the surface of the strip steel at high speed, and the defects of uneven cooling on the surface of the strip steel and the like during the production of thicker strip steel are effectively overcome.
During operation, cooling air is pumped into the air box from the open air through the filter by 2200 kW variable frequency fans, the air volume of the fans is 2 x 122000m3/h, the pressure is 4600Pa, and the blowing pressure of the air box can be adjusted.
The length of the flash cooling section air box 2 after plating is 1500mm, the width is 520 mm, the height is 2500 mm and is respectively arranged at the upper part of the air conditioning air jet cooling spray box 3, and the lower part of the air box 1 of the jet cooling section is connected with the air box 1 of the jet cooling section into a whole; the flash cooling section air boxes 2 are distributed on the upper surface side and the lower surface side of the strip steel, 6 rows of seam type nozzles 21 are arranged on the air boxes, the distance between each nozzle 21 and the strip steel is 150mm, the distance between each nozzle and each nozzle is 400mm, the height of each nozzle is 400mm, and the length of each nozzle is 1500 mm;
two groups of spray beams 22 are provided, the number of each group is 5, the spray beams 22 are hollow bodies, quick connectors (not shown in the figure) are respectively connected to an end part compressed air pipe 25 and a desalted water pipe 26 on the transmission side of the spray beams, and the two groups of spray beams 22 are respectively arranged between two air box slot nozzles 21 and are distributed on the upper surface side and the lower surface side of the strip steel; the two ends of each spray beam are fixed on the side face of the air box 2 through clamping plates 24 and screws, each spray beam is provided with 7 nozzles, the distance between each nozzle 23 and strip steel is 250mm, the distance between each spray beam and the corresponding spray beam is 400mm, the length of each spray beam 22 is 1500mm, and the maximum specification strip steel width of a product is met.
Compressed air and desalted water required by the spray beam 22 are adjusted by flow and pressure of a factory public auxiliary system and then are connected through a quick connector through a pipeline.
Desalted water is used as an atomization water source, the joint flow is 3 m3/h, and the joint pressure is greater than 0.2 MPa;
compressed air is used as an atomization air source, the joint flow is 700 Nm3/h, and the joint pressure is more than 0.5 MPa;
the data are obtained through experiments, and the capability of realizing small spangles on the surface of a thick material by double-sided spraying is verified and achieved; in order to prevent the condensed water from dropping to the zinc pot, water receiving discs 27 are arranged at the lower part of the flash cooling section air box and the upper part of the air conditioner cooling air box after plating, so that the condensed water can be conveniently received.
The flash cooling section after plating has the functions of air injection cooling and spray cooling at the same time, and the switching of the air injection cooling and the spray cooling can be realized according to the process requirement. When the jet cooling is used, the PLC controls an air inlet turning plate (not shown in the figure) between the flash cooling section and the movable jet cooling section after plating to be opened and communicated with the movable jet cooling section at the upper part, and the flash cooling air box nozzle 21 sprays air to the surface of the plating layer; when spray cooling is needed, the PLC controls the air inlet turning plate of the flash cooling section to be closed after plating and is separated from the movable air injection cooling section on the upper portion, the PLC controls the valve table simultaneously, desalted water and compressed air with well-adjusted opening degree enter the spray beam 22 in the flash cooling section, the spray nozzle 23 on the spray beam sprays mist drops with fine granularity, atomized water vapor spreads on the surface of the strip steel plating layer and increases the plating layer nucleation, and the cooling method has obvious effect of generating small spangles for products with the thickness of more than 0.6mm and less than 2.5 mm.
2 air conditioning air jet cooling air boxes 3 are additionally arranged at the bottom of the air box 2 of the post-plating flash cooling section and the upper part of the zinc pot, the width of each air box is 600mm, the height of each air box is 500mm, each air box is provided with 3 nozzles 31, the length of each nozzle is 1500mm, the maximum width of strip steel is 1250mm, a pressure gauge and a thermometer (not shown in the figure) are arranged in each air box, the heat load calculation of air treatment is carried out according to the grasped field environment parameters, and 3 large factors of high temperature, large span and large temperature difference change of the treated air volume are considered; in the scheme, 5 totally-enclosed scroll compressors (not shown in the figure) are selected as a refrigeration main machine (25 Hp multiplied by 3 + 12Hp multiplied by 2) to meet the variation condition of 3 factors. And each cold air spray box is provided with 1 cooling air cooler (not shown in the figure), and the air supply temperature of the cold air is set to be 8-12 ℃ when the frosting critical point is met because the air supply temperature of the cooling air coolers is too low and the heat exchanger is frosted to block an airflow channel. As the section of the nozzle is a fixed value, in order to meet the requirement that the maximum air injection speed is more than or equal to 25m/s and less than or equal to 50m/s, and the ratio of the maximum cold air supply quantity to the minimum cold air supply quantity is 2:1, the maximum output air quantity of each air cooling air cooler is 10000m3/h and the minimum output air quantity is 5000m 3/h.
The air supply volume of each air box is between 5700 and 9000 m3/h, the air injection volume of each nozzle 31 is 1900 to 3000 m3/h, and the purpose is to control the air supply volume and the air injection volume to be beneficial to taking away more than 20 percent of heat on the surface of the strip steel; the air injection temperature is less than or equal to 10 +/-2 ℃, and the purpose is to utilize low-temperature cold air injected by the slot nozzle 31 to rapidly cool the surface of the strip steel to take away heat, increase the supercooling degree of liquid zinc on the surface of the strip steel, form more crystal nuclei in unit area under the action of the cold air, generate more spangles and ensure that the spangles do not grow to form small spangles; the air injection speed is 25-50 m/s, and the purpose is to facilitate the taking away of more than 50% of heat on the surface of the strip steel; when the air injection angle of the nozzle horizontally inclines downwards by 10-12 degrees, the test result meets the requirement that the air injection speed of the nozzle can approach 25m/s when the running speed of the strip steel is 2.5 m/s below the thickness specification of 0.6mm, thereby achieving the most beneficial effect; the distance between the nozzle and the aluminum-zinc-plated strip steel is 60mm +/-5 mm, and the aim is that the mixing temperature of cold air sprayed to the surface of the strip steel can be greatly reduced by shortening the distance between the nozzle and the strip steel;
the parameter setting aims to generate gas (about 9-12 ℃) at the temperature lower than the ambient temperature through air conditioning refrigeration, the gas is sprayed to the surface of the strip steel, and the effect of generating small spangles on products with the thickness of less than 0.6mm is obvious.
The width of the fixed cooling section bellows 4 is 1500mm, the height is 5500mm, the fixed cooling section bellows 4 is fixedly arranged on a platform above the movable air jet cooling section bellows 1, the coated strip steel is discharged from the movable air jet cooling section 1, enters the fixed cooling section bellows 4, and is blown and cooled by a variable frequency cooling fan (not shown in the figure) with the power of 185 kw; 11 rows of the air box nozzles 41 are arranged, and the length of each nozzle 41 is 1500mm, so that the maximum specification of the width of the strip steel is 1250 mm; the nozzle is in a long and narrow slit shape, the opening of the nozzle is 10mm, and the nozzle aims to blow inlet air to the surface of the strip steel at a high speed, so that the defects of uneven cooling of the surface of the strip steel and the like during production of thicker strip steel can be effectively overcome.
The number of the air boxes 4 is two, the air boxes are distributed on the upper surface side and the lower surface side of the strip steel, the strip steel is clamped between the two air boxes, the strip steel vertically runs from bottom to top, the distance between the nozzles 41 of the air boxes and the strip steel is 130mm, the depth of the nozzles is 260mm, the nozzles on the air boxes are arranged from bottom to top, the first row of nozzles 41, the second row of nozzles 42 and the third row of nozzles 43 are the same in distance, the distance between the nozzles is 360mm, the nozzles are horizontally arranged, and the air flow sprayed by the nozzles; an included angle of 70 degrees is formed between the fourth row of nozzles 44 and the third row of nozzles 43, the fourth row of nozzles 44 inclines upwards, an included angle of 70 degrees is formed between the fifth row of nozzles 45 and the sixth row of nozzles 46, the fifth row of nozzles 45 inclines downwards, the distance between the fourth row of nozzles 44 and the fifth row of nozzles 45 is 360mm, inserting plate openings 441 are respectively welded at positions 25mm away from the inner side of the edge of the fourth row of nozzle openings 44 and the inner side of the edge of the fifth row of nozzle openings 45, an inserting plate 442 with the thickness of 50mm is vertically inserted between the fourth row of nozzle openings and the fifth row of nozzle openings, the length of the inserting plate 442 is 1500mm and the length of the nozzle is the same, 16 flat steels 443 with the length of 15mm are vertically welded on the outer side surface of the inserting plate, the flat steels are respectively spaced by 80mm, the height of the flat steels is 330mm, and the purpose is that the temperature of the strip steel is reflected to the surface of the inserting plate 442 by the, the function of reinforcing ribs is achieved; the flat steel 443 also has the function that after the air flow ejected from the nozzles to the strip steel rebounds back to the surface of the vertical inserting plate 442, the air flow is diffused towards the two sides of the inserting plate, the equidistant flat steel blocks the air flow diffusion, and the function of guiding and distributing the air flow is achieved.
The vertical inserting plate 442 is parallel to the surface of running strip steel, high-pressure air flow sprayed out from the fourth row of upward-inclined nozzle openings 44 and the fifth row of downward-inclined nozzle openings 45 is sprayed on the strip steel to form an upper air curtain surface and a lower air curtain surface, the air flow rebounded from the surface of the strip steel meets the vertical inserting plate and rebounds, a trapezoidal air field cushion is formed between the inserting plate and the surface of the strip steel, which is equivalent to that a buffer cushion is depended on the surface of the strip steel, the upper surface and the lower surface of the strip steel in running are respectively acted by the trapezoidal air field cushion, the running of the strip steel is more stable, the phenomenon that the edge of the strip steel is affected by uneven air flow to shake and deflect an air.
The distance between the nozzles in the sixth row 46 and the seventh row 47 is the same, the distance between the nozzles is 360mm, the nozzles are horizontally arranged, and the air flow sprayed out by the nozzles is vertical to the surface of the strip steel; an included angle of 70 degrees is formed between the eighth row of nozzles 48 and the seventh row of nozzles 47, the eighth row of nozzles 48 are inclined upwards, an included angle of 70 degrees is formed between the ninth row of nozzles 49 and the tenth row of nozzles 50, the ninth row of nozzles 49 are inclined downwards, the distance between the eighth row of nozzles 48 and the ninth row of nozzles 49 is 360mm, inserting plate openings are respectively welded at positions 25mm away from the inner side of the edge of the eighth row of nozzle openings 48 and the inner side of the edge of the ninth row of nozzle openings 49, an inserting plate with the thickness of 50mm is vertically inserted between the eighth row of nozzle openings 48 and the ninth row of nozzle openings 49, and a trapezoidal air field cushion is formed between the inserting plate 482 and the surface of the strip steel like air flows sprayed by the inclined nozzles 44 and 45 in the fourth row and the fifth row;
the distance between the tenth row of nozzles 50 and the eleventh row of nozzles 51 is the same, the distance between the nozzles is 360mm, the nozzles are horizontally arranged, and the air flow sprayed out by the nozzles is vertical to the surface of the strip steel; the strip steel runs from bottom to top, is cooled by 7 nozzles perpendicular to the strip steel and 4 inclined nozzles, and the surface temperature of the strip steel is rapidly cooled under the action of two air field cushions formed by the inclined nozzles in the fourth row, the fifth row, the eighth row and the ninth row, and the strip steel runs more stably, so that the phenomenon that the edge of the strip steel is shaken to rub an air box due to uneven air flow is avoided, and the product quality is influenced. The strip steel cooling device and the control method are applied to a production line, so that the problem of small spangles of a coating of a product with the thickness of 0.4-2.5 mm is solved, the surface temperature of strip steel is rapidly cooled, the running of the strip steel is more stable, and the phenomenon that the edge of the strip steel is affected by uneven airflow to shake and rub an air box to influence the product quality is avoided.
It should be noted that the above-mentioned embodiments do not limit the scope of the present invention, and equivalents and substitutions made on the basis of the above-mentioned embodiments are included in the scope of the present invention.
Claims (8)
1. A strip steel cooling device is characterized by comprising a movable cooling device and a fixed cooling device, wherein the movable cooling device consists of a movable air jet cooling section bellows, a plated flash cooling section bellows and an air conditioner air cooling section bellows; the cooling device is arranged from bottom to top, and is firstly cooled by an air box at an air conditioning air cooling section, an air box at a flash cooling section after plating and an air box at a movable air injection cooling section, and then is cooled by an air box at a fixed cooling section; the air conditioner air cooling air bellow, the plated flash cooling section air bellow and the movable air injection cooling section air bellow are fixedly connected into a whole.
2. The strip steel cooling device according to claim 1, wherein the number of the mobile jet cooling section bellows is two, two mobile jet cooling section bellows are respectively arranged on the upper surface side and the lower surface side of the strip steel, the bellows are respectively provided with mobile wheels, the wheels are arranged on the rails, the mobile jet cooling section bellows are driven by a motor to move above the zinc pot, the nozzles on the two mobile jet cooling section bellows are in a slit shape, the number of the nozzles is respectively 10 rows, the distance between the strip steel and the nozzles is 250mm, the longitudinal distance between the nozzles is 400mm, and the slot type nozzles are used for blowing the inlet air to the surface of the strip steel at high speed.
3. The strip steel cooling device according to claim 2, wherein the air box of the flash cooling section after plating has a length of 1500mm, a width of 520 mm and a height of 2500 mm and is respectively installed at the upper part of the air-conditioning air jet cooling spray box, the lower part of the air box of the movable jet cooling section and the air box of the movable jet cooling section are connected into a whole; the flash cooling section bellows after plating distributes on belted steel upper and lower surface side, flash cooling section bellows after plating has seam formula nozzle (21) quantity to have 6 rows, and nozzle (21) and belted steel distance are 150mm, and nozzle interval are 400mm, and the nozzle height is 400mm, and nozzle length is 1500 mm.
4. A strip cooling apparatus according to claim 3, wherein the slot nozzles (21) are provided with two sets of spray beams (22) below, each set is 5 rows, the spray beams (22) are hollow, the quick connectors are respectively connected to the compressed air pipe (25) and the desalted water pipe (26) at the end of the transmission side of the spray beams, and the two sets of spray beams (22) are respectively installed between the two slot nozzles (21) and distributed on the upper and lower surface sides of the strip; the spray beam is characterized in that the two ends of the spray beam are fixed on the side face of the air box (2) through clamping plates (24) and screws, nozzles (23) are mounted on each spray beam, the number of the nozzles is 7, the distance between each nozzle (23) and strip steel is 250mm, the distance between each spray beam and the corresponding spray beam is 400mm, the length of each spray beam (22) is 1500mm, and the maximum specification of the strip steel width of a product is met.
5. The strip steel cooling device according to claim 4, characterized in that two air conditioning air jet cooling air boxes (3) are additionally arranged at the bottom of the flash cooling section air box (2) after plating and at the upper part of the zinc pot, the width of each air box is 600mm, the height of each air box is 500mm, each air box is provided with 3 nozzles (31), the length of each nozzle is 1500mm, the maximum width of the strip steel is 1250mm, and a pressure gauge and a temperature gauge are arranged in each air box.
6. The strip cooling apparatus according to claim 5, wherein 1 cooling air cooler is provided for each air conditioning air jet cooling bellows (3), and the ratio of the maximum amount of cold air to the minimum amount of cold air of the cooling air coolers is 2:1, so that the maximum output air volume of each cooling air cooler is 10000m3/h and the minimum output air volume is 5000m 3/h.
7. The strip steel cooling device according to claim 6, characterized in that the air blowing rate of the air-conditioning air-jet cooling air box is between 5700 m3 m/h and 9000 m3 m/h, the air blowing rate of each nozzle 31 is 1900 m3 m/h, the air blowing temperature is less than or equal to 10 ℃ +/-2 ℃, the air blowing speed is 25m/s to 50m/s, and when the air blowing angle of the nozzle horizontally inclines downwards 10 degrees to 12 degrees, the test result meets the condition that the air blowing speed of the nozzle can approach 25m/s when the strip steel runs at the speed of 2.5 m/s below the thickness specification of 0.6mm, thereby achieving the most beneficial effect; the distance between the nozzle and the aluminum-zinc-plated strip steel is 60mm +/-5 mm.
8. The strip cooling apparatus according to claim 7, wherein two of the windboxes (4) of the fixed cooling zone are arranged on the upper and lower surface sides of the strip, the strip is sandwiched by the two windboxes, the strip runs vertically from bottom to top, the windbox nozzles (41) are spaced from the strip by 130mm, the nozzle depth is 260mm, the nozzles on the windboxes are arranged from bottom to top, the first row of nozzles (41), the second row of nozzles (42) and the third row of nozzles (43) are spaced at the same interval, the nozzles are spaced by 360mm, the nozzles are arranged horizontally, and the air flow ejected from the nozzles is vertical to the surface of the strip; an included angle of 70 degrees is formed between the fourth row of nozzles (44) and the third row of nozzles (43), the fourth row of nozzles (44) inclines upwards, an included angle of 70 degrees is formed between the fifth row of nozzles (45) and the sixth row of nozzles (46), the fifth row of nozzles (45) inclines downwards, the distance between the fourth row of nozzles (44) and the fifth row of nozzles (45) is 360mm, inserting plate openings (441) are respectively welded at the positions 25mm away from the inner side of the edge of the fourth row of nozzle openings (44) and the inner side of the edge of the fifth row of nozzle openings (45), an inserting plate (442) with the thickness of 50mm is vertically inserted between the fourth row of nozzle openings and the fifth row of nozzle openings, the length of the insertion plate (442) is 1500mm, the length of the nozzle is the same, 16 flat steels (443) with the length of 15mm are vertically welded on the outer side surface of the insertion plate, the flat steels are respectively 80mm apart, the height of the flat steels is 330mm, and the strip steel temperature is reflected to the surface of the insertion plate (442) by air flow sprayed by the nozzles (44) and (45).
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| CN113210147A (en) * | 2021-05-21 | 2021-08-06 | 重庆赛迪热工环保工程技术有限公司 | Nozzle structure and special sectional cooler for zinc-aluminum-magnesium with same |
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| CN114507777A (en) * | 2020-11-16 | 2022-05-17 | 上海梅山钢铁股份有限公司 | Furnace pressure control method for horizontal annealing furnace |
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