CN220479751U - Steel billet descaling device - Google Patents
Steel billet descaling device Download PDFInfo
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- CN220479751U CN220479751U CN202322067348.XU CN202322067348U CN220479751U CN 220479751 U CN220479751 U CN 220479751U CN 202322067348 U CN202322067348 U CN 202322067348U CN 220479751 U CN220479751 U CN 220479751U
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- descaling
- steel billet
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 45
- 239000010959 steel Substances 0.000 title claims abstract description 45
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 55
- 238000010438 heat treatment Methods 0.000 claims abstract description 13
- 230000007246 mechanism Effects 0.000 claims description 5
- 238000004891 communication Methods 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 abstract description 24
- 238000004519 manufacturing process Methods 0.000 abstract description 16
- 229910052742 iron Inorganic materials 0.000 abstract description 12
- 238000005096 rolling process Methods 0.000 abstract description 10
- 239000000428 dust Substances 0.000 abstract description 7
- 239000002245 particle Substances 0.000 abstract description 7
- 230000007613 environmental effect Effects 0.000 abstract description 4
- 238000005098 hot rolling Methods 0.000 abstract description 4
- 238000004134 energy conservation Methods 0.000 abstract description 3
- 239000002699 waste material Substances 0.000 abstract description 3
- 238000000034 method Methods 0.000 description 10
- 230000008569 process Effects 0.000 description 3
- 238000007599 discharging Methods 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000003631 expected effect Effects 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
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- Metal Rolling (AREA)
Abstract
The application provides a steel billet descaling device, this steel billet descaling device includes: the high-pressure air source is communicated with the nozzle, and the nozzle is used for descaling the steel billet. The high-pressure air source is a heating furnace steam drum, and continuously blowdown water vapor of the heating furnace steam drum is used for descaling steel billets. The water vapor continuously discharged from the heating furnace drum is introduced into the nozzle for descaling the steel billet, so that the energy waste is reduced, and the production cost of the hot rolling process is further reduced. Meanwhile, the water vapor descaling directly removes the iron scales into turbid circulating water in a trench, and the turbid circulating water does not enter a rolling mill any more, so that the content of particles in air in a steel rolling workshop is reduced, the dust removal cost is further saved, and the purposes of energy conservation and environmental protection are realized.
Description
Technical Field
The application relates to the technical field of hot rolling, in particular to a technology for removing oxide scales on the surface of a high-temperature steel billet.
Background
After the billet is discharged from the heating furnace, the iron scale covered on the surface of the billet is rapidly cooled, and the iron scale generated in the furnace presents net-shaped cracks, so that the iron scale is peeled off from the surface of the billet through the impact of high-pressure water flow, and the purpose of removing the iron scale is achieved. The method of removing scale (high-pressure water descaling) by using the mechanical impact force of high-pressure water is a widely used method. But the running cost of high-pressure water descaling is generally 0.5-1 yuan per ton of steel (the descaling cost of steel grade with high surface quality requirement is higher), and the investment of high-pressure water preparation equipment is larger.
Disclosure of Invention
The application provides a steel billet descaling device for reducing the production cost of steel billet descaling.
The application provides a steel billet descaling device, include: a high pressure gas source and a nozzle, wherein,
the high pressure air source is communicated with the nozzle,
the nozzle is used for descaling the steel billet.
In the technical scheme, the high-pressure air source and the nozzle are arranged, the high-pressure air source is communicated with the nozzle, and the nozzle is used for descaling the steel billet; the high-pressure air source is adopted to replace the traditional high-pressure water source for steel billet descaling, so that the production cost of steel billet descaling is reduced.
In a specific embodiment, the high pressure gas source is in communication with the nozzle via a conduit having a sub-control valve disposed thereon.
In a specific embodiment, the high pressure gas source is a furnace drum, and continuously blowdown water vapor of the furnace drum is used for billet descaling. The water vapor continuously discharged from the heating furnace drum is introduced into the nozzle for descaling the steel billet, so that the energy waste is reduced, and the production cost of the hot rolling process is further reduced. Meanwhile, the water vapor descaling directly removes the iron scales into turbid circulating water in a trench, and the turbid circulating water does not enter a rolling mill any more, so that the content of particles in air in a steel rolling workshop is reduced, the dust removal cost is further saved, and the purposes of energy conservation and environmental protection are realized.
In a specific embodiment, a total control valve is arranged on the pipeline between the heating furnace steam drum and the sub-control valve.
In a specific embodiment, the continuously blowdown water vapor of the furnace drum is comprised of a mixture of water and steam.
In a specific embodiment, the steam pressure is from 0.7 to 0.8MPa.
In a specific embodiment, the method further comprises a descaling cover arranged corresponding to the position of the steel billet, and the nozzle is arranged in the descaling cover.
In a specific embodiment, the number of nozzles is a plurality.
In a specific embodiment, a blowdown mechanism is also included for collecting and transporting scale from the descaling.
In a specific embodiment, the drainage mechanism is a trench filled with turbid circulating water at a certain flow rate.
Drawings
Fig. 1 is a schematic structural diagram of a billet descaling device different from a conventional high-pressure water dephosphorization process according to an embodiment of the present application.
Detailed Description
The present application is further described in detail below by way of the accompanying drawings and examples. The features and advantages of the present application will become more apparent from the description.
The word "exemplary" is used herein to mean "serving as an example, embodiment, or illustration. Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments. Although various aspects of the embodiments are illustrated in the accompanying drawings, the drawings are not necessarily drawn to scale unless specifically indicated.
In addition, the technical features described below in the different embodiments of the present application may be combined with each other as long as they do not collide with each other.
In order to facilitate understanding of the billet descaling device provided by the embodiment of the application, an application scene of the device is described first. After the billet is discharged from the heating furnace, the iron scale covered on the surface of the billet is rapidly cooled, and the iron scale generated in the furnace presents net-shaped cracks, so that the iron scale is peeled off from the surface of the billet through the impact of high-pressure water flow, and the purpose of removing the iron scale is achieved. The method of removing scale (high-pressure water descaling) by using the mechanical impact force of high-pressure water is a widely used method. But the running cost of the high-pressure water descaling is higher (the consumption of a plunger of the high-pressure water descaling pump is high), and the construction investment of the high-pressure water preparation equipment is larger. Therefore, the embodiment of the application provides another steel billet descaling device for reducing the production cost of steel billet descaling. The following detailed description is of embodiments with reference to the specific drawings.
Referring to fig. 1, in fig. 1, an embodiment of the present application provides a steel billet descaling device, including: a high pressure gas source 1 and a nozzle 2. Wherein the high pressure gas source 1 is in communication with the nozzle 2. The nozzle 2 is used for descaling a billet 7. The high-pressure air source 1 is communicated with the nozzle 2 through a pipeline 3, and a sub-control valve 4 is arranged on the pipeline 3. The sub-control valve 4 is an electro-pneumatic valve; in specific implementation, the sub-control valve 4 may also be a solenoid valve. A main control valve 5 is arranged on the pipeline 3 between the heating furnace steam drum and the sub control valve 4. The total control valve 5 adopts a gate valve; in particular, the total control valve 5 may also be a solenoid valve.
In the technical scheme, the high-pressure air source 1 and the nozzle 2 are arranged, the high-pressure air source 1 is communicated with the nozzle 2, and the nozzle 2 is used for descaling a billet; the high-pressure air source 1 is adopted to replace the traditional high-pressure water source for steel billet descaling, so that the production cost of steel billet descaling is reduced.
With continued reference to fig. 1, in one particular possible embodiment, the high pressure gas source 1 is a furnace drum, with continuously blowdown water vapor of the furnace drum being used for billet descaling. The scale removing device also comprises a pollution discharging mechanism which is used for collecting and conveying the scale obtained by the descaling. In a specific embodiment, the drainage mechanism is a trench, which is filled with turbid circulating water. By introducing the water vapor continuously discharged from the heating furnace steam drum into the nozzle 2 for descaling the steel billet, the energy waste is reduced, and the production cost of descaling the steel billet is further reduced. Meanwhile, the water vapor descaling directly removes the iron scales into turbid circulating water in a trench, and the turbid circulating water does not enter a rolling mill any more, so that the content of particles in the air of a billet descaling workshop is reduced, the production cost of dust removal is further saved, the production cost of a hot rolling process is further reduced, and the purposes of energy conservation and environmental protection are realized.
With continued reference to FIG. 1, in one particular possible embodiment, the continuously blowdown water vapor of the furnace drum is comprised of a mixture of water and steam. The pressure of the steam is 0.7-0.8MPa. In this embodiment, the pressure of the steam is determined by the continuous blowdown pressure of the furnace drum. In practice, a pressurizing device, such as a pressurizing pump, may be added or removed to increase the pressure of the steam in order to increase the efficiency of the descaling.
With continued reference to fig. 1, in one particular embodiment, a descaler hood 6 is also included, positioned in correspondence with the position of the billet 7. The number of the nozzles 2 is plural (two or more), such as two, three, or other different numbers. The nozzle 2 is arranged on the descaling hood. The billet 7 is conveyed by the billet conveying rollers 8. By providing a plurality of nozzles 2, the efficiency of descaling the billet is improved, and the production efficiency can be improved.
In order to vividly illustrate the low cost effect brought by the traditional high-pressure water descaling, the technical scheme of the application is illustrated as follows:
the main equipment for high-pressure water descaling is a descaling pump. The flow rate of one descaling pump is 20 cubic meters per hour, and the maximum lift is 2500m (500 m is used for screw thread steel); the power used for one motor is 185kW. The actual power consumption of the motor is as follows: flow x head x specific gravity of water ≡367 ≡60% ≡92.5% = 20×500×1 ≡367 ≡60% ≡92.5% = 49.09kW. The production rate of one hour of normal production is calculated according to 200t, the electricity price is 0.62 yuan, and the electricity consumption cost is 49.09 multiplied by 0.62 multiplied by 200 multiplied by 0.152 yuan/t; the high-pressure water descaling water consumption is very small and is not counted. If the high-pressure water descaling system is normally opened in normal production, the spare parts need to be replaced for one set in three months, wherein the spare parts mainly comprise a high-pressure nozzle, a liquid inlet valve, a liquid outlet valve, a plunger, a space ring and the like which are 96864 yuan in total (the spare parts which need to be replaced in two to three years are not counted), the total yield of three months is calculated according to 120984 multiplied by 3= 362952t (according to the average yield of 120984 t/month conversion of 5 to 8 months in 2022), and the spare part consumption cost is 96864/362952 =0.267 yuan/ton of steel; the total operating cost of the high-pressure water descaling is 0.152+0.267=0.419 yuan/ton of steel (if other steel grades with higher surface quality requirements are produced, the lift (namely the water pressure) of the descaling pump is increased, the consumption of spare parts is correspondingly increased, and the operating cost is correspondingly increased). And because the frequency of a dust removing fan motor (1000 kW,50 Hz) is reduced by 10Hz (from 45 to 35 Hz) by reducing the frequency of the dust removing fan motor (1000 kW,50 Hz), the dust removing fan motor is reduced by 1000 multiplied by 10 multiplied by 50 multiplied by 90 multiplied by 0.62 multiplied by 220 multiplied by 0.05 yuan/ton of steel (the hour yield is calculated according to 220 tons), and compared with the cost of the existing high-pressure water descaling system, the total water vapor descaling cost is reduced by 0.419+0.05 multiplied by 0.469 yuan/t.
The particles in the air in the rolling mill shop are mainly formed by crushing and floating iron scales attached to the surface of a steel billet in the rolling process. The scale is directly removed by water vapor descaling and enters turbid circulating water in a trench (purified by a turbid circulating system) and does not enter a rolling mill any more, and the content of air particles near the rolling mill is 15.12mg/m originally 3 Down to 2.35mg/m 3 The method is the same as the traditional method for removing the scale and purifying the particles by using the high-pressure water, and is superior to a production line without a scale removing process.
To sum up, this application scheme is based on reduction in production cost and environmental protection's purpose, introduces the steam of the continuous blowdown of heating furnace steam drum to flat nozzle by the steam drum even in the calandria pipeline, then is used for the descaling, and this technological process is: drum connecting and discharging pipeline, gate valve, electric pneumatic valve and flat nozzle. The water vapor for continuous sewage discharge is formed by mixing water and steam with the pressure of 0.7-0.8MPa. The system achieves the expected effect after debugging and improvement, the oxide skin on the surface of the billet is basically removed and directly enters the trench, the content of air particles near the rolling mill is reduced from 15.12mg/m 3 Down to 2.35mg/m 3 And therefore, the frequency of the dust removing fan is reduced, and the descaling operation cost is zero. The total investment of pipelines, valves, nozzles, control lines, protective covers and the like is about 1900 yuan, and the total investment of a set of high-pressure water descaling system is 69.7 ten thousand yuan. Obviously, the scheme of the application greatly reduces the production cost of steel billet descaling.
In the description of the present application, it should be noted that the directions or positional relationships indicated by the terms "upper", "lower", "inner", "outer", "front", "rear", "left", "right", etc. are based on the directions or positional relationships in the working state of the present application, are merely for convenience of description and simplification of description, and do not indicate or imply that the apparatus or element to be referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present application.
In the description of the present application, it should be noted that the terms "mounted," "connected," and "connected" are to be construed broadly, unless explicitly specified and limited otherwise. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art in a specific context.
The present application has been described in connection with the preferred embodiments, but these embodiments are merely exemplary and serve only as illustrations. On the basis of this, many alternatives and improvements can be made to the present application, which fall within the scope of protection of the present application.
Claims (10)
1. A billet descaling device comprising: a high pressure gas source and a nozzle, wherein,
the high pressure air source is communicated with the nozzle,
the nozzle is used for descaling the steel billet.
2. The steel billet descaling device according to claim 1, wherein the high pressure gas source is in communication with the nozzle through a conduit having a sub-control valve disposed thereon.
3. The steel billet descaling apparatus according to claim 2, wherein the high pressure gas source is a heating furnace drum, and wherein continuously blowdown water vapor of the heating furnace drum is used for steel billet descaling.
4. A billet descaling device according to claim 3, wherein a total control valve is provided in the conduit between the heating furnace drum and the sub control valve.
5. A billet descaling apparatus according to claim 3, wherein the continuously blowdown water vapour of the furnace drum consists of a mixture of water and vapour.
6. The steel billet descaling apparatus according to claim 5, wherein the pressure of the steam is 0.7-0.8MPa.
7. The steel slab descaling device according to claim 1, further comprising a descaling hood provided corresponding to the position of the steel slab, wherein the nozzle is provided in the descaling hood.
8. The steel billet descaling apparatus according to claim 1, wherein the number of the nozzles is plural.
9. The steel slab descaling device of any of claims 1 to 8, further comprising a blowdown mechanism for collecting and transporting scale from descaling.
10. The steel billet descaling apparatus according to claim 9, wherein the drainage means is a trench filled with turbid circulating water at a certain flow rate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322067348.XU CN220479751U (en) | 2023-08-02 | 2023-08-02 | Steel billet descaling device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322067348.XU CN220479751U (en) | 2023-08-02 | 2023-08-02 | Steel billet descaling device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220479751U true CN220479751U (en) | 2024-02-13 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322067348.XU Active CN220479751U (en) | 2023-08-02 | 2023-08-02 | Steel billet descaling device |
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| CN (1) | CN220479751U (en) |
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2023
- 2023-08-02 CN CN202322067348.XU patent/CN220479751U/en active Active
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