CN110087802B - Thin strip continuous casting strip steel cooling mechanism and cooling method thereof - Google Patents
Thin strip continuous casting strip steel cooling mechanism and cooling method thereof Download PDFInfo
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- CN110087802B CN110087802B CN201680091699.4A CN201680091699A CN110087802B CN 110087802 B CN110087802 B CN 110087802B CN 201680091699 A CN201680091699 A CN 201680091699A CN 110087802 B CN110087802 B CN 110087802B
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Abstract
A thin strip continuous casting strip steel cooling mechanism is provided with a plurality of cooling groups (C1, C2, cns), each cooling group comprises at least one cooling unit (1), and the cooling mode of the cooling units in each cooling group is at least one of aerial fog cooling, laminar flow cooling and jet cooling; the cooling unit is respectively positioned on the upper side and the lower side of the roller way and comprises a header main path (2) connected to a water path pipeline or an air path pipeline and at least two header branch paths (3) communicated with the header main path, a plurality of nozzles (4) are arranged on the header branch paths, an on-off switch (5) for controlling the on-off of the cooling unit is arranged on the header main path, and opening control valves (6) for controlling the flow of gas and liquid in the cooling unit are also arranged on the water path pipeline and the air path pipeline. The cooling mechanism realizes the control of the cooling speed of the strip steel and has the effect of uniformly cooling the strip steel. Also comprises a cooling method of the thin strip continuous casting strip steel cooling mechanism.
Description
Technical Field
The invention relates to the technical field of thin strip continuous casting, in particular to a thin strip continuous casting strip steel cooling mechanism and a cooling method of the cooling mechanism.
Background
At present, according to the pouring requirements of different steel grades in the thin strip continuous casting process, equipment is required to meet the control of different cooling speeds and curling temperatures so as to meet the production requirements of different steel grades.
At present, the controlled cooling modes of strip steel mainly comprise laminar cooling, pressure jet cooling, spray cooling, water curtain cooling, direct quenching, air mist cooling and the like.
Wherein, the laminar cooling is carried out by impacting the surface of the steel plate through columnar water flow, and the water flow keeps a laminar state and can obtain strong cooling capacity; the defects are that the cooling area is long in distance, a certain distance exists between the collecting pipes, transverse cooling is uneven, the requirement on water quality is high, the nozzle is easy to block, equipment is complex, later maintenance cost is high, and the cooling device is suitable for being used under a strong cooling condition.
The pressure jet cooling method is characterized in that the penetrability is good, the cooling efficiency is high, water can be recycled, and the pressure jet cooling method is suitable for the environment with a thicker water vapor film; the defects of low uniformity, large water consumption, serious water splashing, higher requirement on water quality, easy blockage of a water spraying hole and suitability for quenching conditions.
The spray cooling is to pressurize water, spray out from spray holes, and cool by impacting the cooled steel plate surface with liquid drop group, compared with the pressure spraying method, the cooling is uniform, and the cooling capacity is stronger; the defects are that higher pressure is needed, the cooling speed adjusting range is small, and the requirement on water quality is higher; at present, the application is less.
The water curtain cooling is that cooling water forms smooth curtain-shaped water flow through a slit nozzle and is sprayed to the surface of the steel plate, the water flow keeps a laminar flow state, the adjustable cooling speed range is small, the distance of a cooling area is short, the requirement on water quality is not high, and the maintenance is easy; the defects that the upper surface and the lower surface of the strip steel and the whole cooling area are cooled unevenly, and the water spraying strength distribution along the width direction of the steel plate is not easy to control; the cooling device is suitable for cooling on a strip steel output roller way or cooling between continuous rolling machine frames.
Direct quenching, namely directly immersing the steel plate into water for quenching or rapid cooling, wherein the cooling speed is high; the defects are that the cooling is not uniform, the adjusting range of the cooling speed is small, the applicable steel grade is limited, and the water quantity is large; it is suitable for steel plate with high tensile strength (higher than 600MPa) and bainite and martensite containing microscopic structure.
The gas-mist cooling adopts an air and water orthogonal nozzle, and is a gas-liquid two-phase flow cooling technology. The method utilizes the water atomization principle to spray water on the surface of the steel plate in a mist shape, the cooling is uniform, the cooling speed adjusting range is large, the defects are that the equipment is complex, the requirements on air and water are strict, the fog of a factory building is large, and the equipment is easy to corrode; the cooling device is suitable for extremely wide cooling capacity range from air cooling to strong water cooling, and is particularly suitable for secondary cooling of continuous casting.
As different strip steel cooling methods have different cooling mechanisms, the water flow is broken into liquid drops by compressed air in the aerosol cooling, and the liquid drops collide with hot strip steel to quickly absorb heat and gasify, thereby taking away a large amount of heat and achieving the purpose of cooling the strip steel; however, when the flow of the cooling water of the aerial fog is large, the strip steel still has a residual water film layer, and an air film layer is arranged between the water film layer and the hot strip steel, so that the air film layer blocks the gasification of the cooling water and plays a role in the heat transportation. The gas fog cooling method is distributed evenly along the width direction of the strip steel, which is beneficial to controlling the strip steel plate shape, the gas fog cooling process is relatively complex, and the temperature drop value of the strip steel after gas fog cooling is closely related to the strip steel thickness, the strip speed, the gas-water flow, the material specific heat, the initial temperature, the heat exchange coefficient and the like.
Disclosure of Invention
The invention aims to provide a cooling mechanism and a cooling method thereof, which can ensure the cooling speed, the cooling effect and the uniformity of thin strip continuous casting strip steel.
In order to solve the technical problems, the invention adopts the following technical scheme:
a cooling mechanism for thin strip continuous casting strip steel is arranged on a horizontal roller way at the outlet of a casting and rolling machine and is positioned between a rolling machine mechanism and a curling mechanism, a plurality of cooling groups are arranged in the cooling mechanism, each cooling group comprises at least one cooling unit, and the cooling mode of the cooling unit in each cooling group is at least one of aerial fog cooling, laminar flow cooling and jet cooling; the cooling units are respectively positioned on the upper side and the lower side of the roller way and comprise header main paths connected to a water path pipeline or a gas path pipeline and at least two header branch paths communicated with the header main paths, a plurality of nozzles are arranged on the header branch paths, an on-off switch used for switching on or off the cooling units is arranged on each header main path, and opening control valves used for controlling the flow rates of gas and liquid in the cooling units are further arranged on the water path pipeline and the gas path pipeline.
Wherein the cooling mechanism comprises a rough cooling section cooling mechanism which is positioned in the rough cooling section and used for rough cooling; in the cooling units of each cooling group in the rough cooling section cooling mechanism, the header manifolds of at least three cooling units are controlled by one opening degree control valve.
The cooling mechanism also comprises a fine cooling section cooling mechanism which is positioned in the fine cooling section and used for fine cooling; in the cooling units of each cooling group in the fine cooling section cooling mechanism, at most two header manifolds of the cooling units are controlled by one opening degree control valve.
And the gas pipeline or the water pipeline is also provided with a homogenizer to uniformly control the cooling speed of each of the rough cooling section and the fine cooling section.
And the nozzles on the two adjacent header branches at the same side in the cooling unit are respectively arranged in a staggered manner.
The joint structures between the header main circuits and the header branch circuits are the same, and the joint structures between the header main circuits and the water channel pipelines or the air channel pipelines are the same.
The nozzle is rectangular or oblate, and one group of opposite sides of the rectangle are arc-shaped.
And each on-off switch is an on-off control electromagnetic valve.
The range of the height of the nozzles on the header branch on the upper side of the roller way is 80-750 mm, the range of the height of the nozzles on the header branch on the lower side of the roller way is 50-550 mm, the range of the distance between two adjacent nozzles on the header branch on the upper side of the roller way is 50-700 mm, and the range of the distance between two adjacent nozzles on the header branch on the lower side of the roller way is 50-500 mm.
The cooling medium in the water path pipeline comprises water, and the cooling medium in the air path pipeline comprises at least one of aerial fog, air, nitrogen or other gases.
The opening control valve and the on-off switch of each cooling group are electrically connected with a control unit so as to adjust the opening of the opening control valve and the on and off of the on-off switch.
The roller way is also provided with a temperature detection device for detecting the temperature of the strip steel on the roller way in real time and a speed detection device for detecting the moving speed of the strip steel, and the temperature detection device and the speed detection device are also in communication connection with the control unit.
The invention also provides a cooling method based on the thin strip continuous casting strip steel cooling mechanism, which comprises the following steps:
s1: according to the technological requirements of the thin strip continuous casting strip steel, configuring a cooling group, the number of cooling units in the cooling group and cooling modes, wherein the cooling modes comprise aerial fog cooling, laminar flow cooling and jet cooling;
s2: connecting the cooling unit to the corresponding water channel pipeline or air channel pipeline according to the cooling mode configured in the step S1;
s3: according to the configuration of steps S1-S2, the control unit controls the opening of the opening control valve and the on and off of the on-off switch of each cooling group electrically connected thereto, and performs a cooling operation;
s4: when the cooling operation is completed, the respective on-off switches and the opening degree control valves are closed.
Wherein, step S3 further includes: the temperature detection device arranged on the roller way sends the detected temperature information of the strip steel to the control unit, the speed detection device arranged on the roller way sends the detected speed information of the strip steel to the control unit, and the control unit performs feedforward control on pressure or flow on the opening control valve and the on-off switch in each cooling group according to the received temperature information and speed information.
Wherein, step S3 further includes: the coiling mechanism positioned on one side of the cooling mechanism detects the coiling temperature of the strip steel in real time, and sends the detected temperature information to the control unit in communication connection with the coiling mechanism, and the control unit compares the received temperature information with the preset coiling temperature in the control unit and performs feedback control according to the comparison result so as to adjust the opening of the opening control valve and the on-off of the on-off switch.
Wherein, in step S1, the method further comprises dividing the cooling section of the cooling mechanism into a rough cooling section and a fine cooling section, and in step S2, the method further comprises: connecting each cooling unit to a corresponding water path pipeline or gas path pipeline according to the division of the cooling section in the step S1, wherein at least three cooling units in the cooling group of the rough cooling section are controlled by one opening control valve; and at most two cooling units in the cooling units of the fine cooling section are controlled by one opening control valve together.
Compared with the prior art, the invention has the beneficial effects that:
1. the cooling groups in the cooling mechanism can adopt different cooling modes to cool strip steel, the header buses of the cooling unit are respectively communicated with at least two header branches, and each header bus is respectively provided with an on-off switch, so that on the basis of saving cost, the header branches can be controlled in a unified manner, and the uniformity of cooling is realized;
2. the structure of the connecting port between the header main and the header branch is the same (modular design), and the specification of the connecting port between the header main and the water channel pipeline or the gas channel pipeline is the same, so that the cooling mode and the position of each cooling group can be adjusted according to the technological requirements of strip steel, and the cooling speed and the cooling effect of a cooling curve can be met;
3. in order to obtain different pressure flow regulation requirements, the height of each cooling unit from the surface of the strip steel can be regulated, and the distance between the nozzles on the manifold branches can also be changed, so that the cooling uniformity of the strip steel in the width direction can be ensured;
4. the cooling section where the cooling mechanism is located can be divided into a coarse cooling section and a fine cooling section, so that the cooling modes of all cooling groups are better distributed;
5. the homogenizer and the opening control valve are arranged, so that the uniformity of flow and pressure on each header main line and each header branch line can be ensured, and the uniform cooling effect is further ensured;
6. the temperature detection device, the quick reading detection device and the curling mechanism which are arranged on the roller way can detect the temperature and the moving speed of the strip steel in real time, and the control unit which is in communication connection with the opening control valve and the on-off switch can perform feedforward and feedback regulation on the opening of the opening control valve and the connection and disconnection of the on-off control valve according to the temperature information and the speed information from the temperature detection device, the quick reading detection device and the curling mechanism so as to ensure the requirements of the cooling mechanism on the cooling temperature and the cooling speed of the strip steel continuous casting.
Drawings
FIG. 1 is a schematic view showing a position of a thin strip continuous casting strip cooling mechanism according to an embodiment of the present invention;
FIG. 2 is a structural view of a thin strip casting strip cooling mechanism according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a cooling group of a single set of pipes (water or gas circuits) according to an embodiment of the present invention;
FIG. 4 is a schematic structural diagram of a cooling group of two sets of pipes (water path and gas path) in an embodiment of the present invention;
FIG. 5 is a schematic diagram of a cooling unit in another embodiment of the present invention;
fig. 6 is a flowchart of a cooling method of the thin strip casting strip cooling mechanism according to the embodiment of the present invention.
Description of the reference numerals
1-Cooling Unit 2-header manifold
3-manifold branch 4-nozzle
5-on-off switch 6-opening degree control valve
7-homogenizer 8-branch
100-cooling mechanism 200-rolling mill mechanism
300-crimping mechanism 400-pinch roll
Detailed Description
The invention is described in further detail below with reference to the figures and the examples, but without limiting the invention.
As shown in fig. 1, which is a schematic position diagram of a cooling mechanism of a thin strip continuous casting strip according to an embodiment of the present invention, wherein the cooling mechanism 100 is disposed on a horizontal roller way at an outlet of a rolling mill and is located between a rolling mill mechanism 200 and a coiling mechanism 300, and as shown in fig. 1, a plurality of sets of pinch rolls 400 may be further disposed between the cooling mechanism 100 and the coiling mechanism 300 and at a front side of the rolling mill mechanism 200 to clamp and convey the strip and form a certain tension; the rolling mill mechanism 200 is used to control the shape and thickness of the strip, and the coiling mechanism 300 is used to coil the strip for storage and transport. In addition, as shown in fig. 1, a plurality of cooling groups (C1, C2, …, Cn) are disposed in the cooling mechanism 100, and each cooling group includes at least one cooling unit 1, the cooling manner of each cooling unit 1 may be aerosol cooling, laminar cooling, or air-jet cooling, and the cooling manners of the cooling units 1 in the same cooling group may be the same or different, and in order to meet the required process requirements, the cooling manner of each cooling unit 1 may be adjusted or the positions of the cooling groups may be adjusted; correspondingly, according to the selected cooling mode, the cooling unit 1 is provided with a water channel and/or a gas channel manifold for respectively conveying gas and liquid, the cooling medium in the water channel manifold can be water, and the cooling medium in the gas channel manifold can be at least one of air, nitrogen or other gases; correspondingly, the cooling medium in the water path pipeline can be water, and the cooling medium in the air path pipeline can be at least one of air, nitrogen or other gases.
As shown in fig. 2, a structure diagram of a cooling mechanism according to an embodiment of the present invention is shown, wherein, along the direction of the arrow representing the transportation direction of the strip steel, the cooling groups (C1, C2, …, Cn) of the cooling mechanism 100 are respectively disposed on the upper side and the lower side of the strip steel (i.e., the roller way), that is, the cooling unit 1 in this embodiment includes a header main 2 respectively disposed on the upper side and the lower side of the roller way and connected to a water path pipeline or a gas path pipeline, and at least two header branches 3 communicated with the header main 2, as shown in fig. 2, there are two header branches 3, a plurality of nozzles 4 are distributed on the header branches 3, each header main 2 is further provided with an on-off switch 5 for turning on or off the water path and the gas path of the cooling unit 1, as in this embodiment, an on-off control solenoid valve is used. The water channel pipeline and the gas channel pipeline are also provided with opening control valves 6 for controlling the flow of gas and liquid in each cooling unit 1, and meanwhile, in order to ensure the uniformity of the cooling effect, the nozzles 4 on the two adjacent header branch circuits 3 on the same side in the cooling unit 1 in the embodiment are respectively arranged in a staggered manner, so that the liquid or gas sprayed out of the nozzles 4 can be uniformly sprayed on the strip steel, and the uniform cooling effect is ensured.
Because the on-off switch 5 for controlling the on-off of the collecting pipe is arranged on the collecting pipe main circuit 2 of each cooling unit 1 in the embodiment, the switch is not required to be arranged on each collecting pipe branch circuit 3, the cost is saved, and the on-off of the corresponding collecting pipe branch circuits 3 is ensured so as to ensure the uniformity of the cooling effect. In addition, in a preferred embodiment, the cooling mechanism 100 includes a rough cooling section cooling mechanism located in the rough cooling section and a fine cooling section cooling mechanism located in the fine cooling section, and at least three cooling units 1 in the cooling units 1 of the cooling group in the rough cooling section cooling mechanism are controlled by an opening control valve 6; in the cooling units 1 in the cooling group of the fine cooling section cooling mechanism, at most two cooling units 1 are controlled by an opening control valve 6, and meanwhile, the positions of the coarse cooling section cooling mechanism and the fine cooling section cooling mechanism can be interchanged and adjusted to meet different cooling process requirements; the cooling mode used by each cooling unit 1 during the cooling process can also be changed to meet different cooling process curve requirements.
In a preferred embodiment, a homogenizer 7 is further arranged on the gas pipeline or the water pipeline so as to uniformly control the flow and the pressure in the header group of each cooling unit; the design of the homogenizer 7 can also ensure the uniformity of the cooling speed of the rough cooling section, and further effectively control the cooling speed and the cooling effect of the cooling mechanism 100.
In addition, for convenience of parts of each cooling unit 1 or replacement of each cooling unit 1 in the present embodiment, the structure of the interface between the header trunk 2 and each header branch 3 is the same, and the structure of the interface between each header trunk 2 and the water passage pipe or the gas passage pipe is the same. The interface structure is the same, that is, each manifold branch 3 and the manifold main 2 can have a unified butt joint structure, and the mounting positions of the manifold branches 3 can be changed; the installation positions of the header pipes 2 can be changed from each other. Therefore, the cooling method or the cooling effect can be changed by changing the position of each cooling unit 1 according to the process requirement to be satisfied.
In addition, in a preferred embodiment, the height of the nozzles 4 and the distance between the nozzles 4 may be different for different cooling units 1, specifically, the height of the nozzles on the manifold branch 3 on the upper side of the roller table ranges from 80mm to 750mm, the height of the nozzles on the manifold branch 3 on the lower side of the roller table ranges from 50mm to 550mm, the distance between two adjacent nozzles 4 on the manifold branch 3 on the upper side of the roller table ranges from 50mm to 700mm, and the distance between two adjacent nozzles 4 on the manifold branch 3 on the lower side of the roller table ranges from 50mm to 500 mm.
In addition, as shown in fig. 3, a schematic structural diagram of a cooling group of a single group of pipes (water paths or air paths) in an embodiment of the present invention is shown. The cooling mode can be air jet cooling or laminar flow cooling, and the cooling operation is carried out by cooling water and compressed gas in a single way. Meanwhile, in order to enhance the uniformity of the cooling effect of the embodiment, the shape of the outlet of the nozzle 4 in the embodiment of the present invention may be substantially rectangular or oblate, and any one set of opposite sides of the rectangle is arc-shaped to avoid the mutual influence between two adjacent nozzles 4, as shown in fig. 3, a and B respectively represent the nozzles 4 on two manifold branches 3, and due to the alternate arrangement of the nozzles 4, the cooling liquid or gas sprayed from the nozzles 4 is uniformly sprayed on the strip steel. As can be seen from the spraying effects of the nozzles 4 on the two manifold branches 3, the spraying effects (cooling effects) of the respective portions of the strip steel are substantially the same, thereby ensuring the uniformity of the cooling effects.
Fig. 4 is a schematic diagram of a cooling group with two groups of pipes (water path and air path) according to an embodiment of the present invention. Wherein, the solid line represents the gas circuit pipeline 8, the dotted line represents the water circuit pipeline 9, namely the cooling mode can be aerosol cooling, the aerosol cooling adopts the air and water orthogonal nozzle, is a cooling technology of gas-liquid two-phase flow, and utilizes the water atomization principle to make water spray to the steel plate surface in a foggy manner to achieve the cooling effect. Wherein, the manifold branch 3 in the water path is communicated with the manifold branch 3 in the gas path pipeline, so as to keep the gas to be sprayed out together with the liquid from the nozzle 4 of the manifold branch 3 in the water path, and generate the atomization reaction, thereby achieving the cooling effect. For example, in an embodiment, the cooling medium is aerosol, 5 cooling groups may be adopted, wherein 3 cooling groups are located in the rough cooling section, 2 cooling groups are located in the fine cooling section, the cooling groups in each rough cooling section cooling mechanism respectively include 10, 8, 6 cooling units 1, the cooling groups in the fine cooling section cooling mechanism total 12 cooling units 1, each cooling unit 1 includes 2 manifold branches 3, the height of a nozzle 4 on the upper side of the strip steel is 350mm, the distance between two nozzles 4 on the same manifold branch 3 is 400mm, the height of a nozzle 4 on the lower side of the strip steel is 180mm, the distance between two nozzles 4 on the same manifold branch 3 is 180mm, and finally, the average cooling speed is 38 ℃/s, and when the coiling temperature is 590 ℃, better cooling uniformity can be achieved in the width direction of the strip steel.
In another embodiment, when the combination method of laminar cooling and aerosol cooling is adopted, the cooling medium is water and aerosol, and comprises 2 groups of cooling groups, wherein laminar cooling and aerosol cooling are respectively adopted, the cooling group adopting laminar cooling comprises 10 cooling units 1, the cooling group adopting aerosol cooling comprises 10 cooling units 1, each cooling unit 1 comprises 2 manifold branches 3, the height of a nozzle 4 positioned on the upper side of the strip steel is 390mm, the distance between two nozzles 4 on the same manifold branch 3 is 440mm, the height of a nozzle 4 positioned on the lower side of the strip steel is 150mm, the distance between two nozzles 4 on the same manifold branch 3 is 150mm, finally, the average cooling speed can be 33 ℃/s, and when the coiling temperature is 620 ℃, better cooling uniformity can be achieved in the width direction of the strip steel.
In another embodiment, when the methods of aerosol cooling and gas jet cooling are adopted, the cooling medium in the cooling section can be aerosol and nitrogen; when 3 cooling groups are adopted, 2 cooling groups can adopt aerial fog cooling, 1 cooling group adopts air jet cooling, 6 cooling units are included in the cooling group adopting aerial fog cooling, each cooling unit 1 comprises 2 collecting pipe branches 3, the height of a nozzle 4 positioned on the upper side of strip steel is 280mm, the distance between two nozzles 4 on the same collecting pipe branch 3 is 380mm, the height of a nozzle 4 positioned on the lower side of the strip steel is 80mm, the distance between two nozzles 4 on the same collecting pipe branch 3 is 100mm, the average cooling speed can be finally reached to 25 ℃/s, and when the coiling temperature is 690 ℃, the better cooling uniformity can be reached in the width direction of the strip steel.
As shown in fig. 5, the cooling unit in another embodiment of the present invention is a schematic structural diagram, wherein the cooling unit has a water path and a gas path, and can be used for atomized cooling, the manifold branch 3 in the cooling unit 1 is configured as a branch 8 extending from the manifold main 2, and the nozzle 4 is arranged at the outlet end of the branch 8 to realize the ejection of gas or liquid.
In a preferred embodiment, the opening control valves 6 and the on-off switches 5 in each cooling group are electrically connected to a control unit (not shown) to adjust the opening of each opening control valve 6 and the on and off of the on-off switches 5. In addition, a temperature detection device for detecting the temperature of the strip steel on the roller table in real time and a speed detection device for detecting the moving speed of the strip steel can be arranged on the roller table, and the temperature detection device and the speed detection device are also in communication connection with the control unit. With such a configuration, the control unit can feed forward the on-off switch 5 and the opening control valve 6 of each cooling group in real time according to the temperature information received by the control unit from the temperature detection device and the speed information received by the control unit from the speed detection device, so as to ensure the uniformity of the cooling effect. In addition, the coiling mechanism 300 at one side of the cooling mechanism detects the coiling temperature of the strip steel in real time, and sends the detected temperature information to a control unit in communication connection with the coiling mechanism, the control unit compares the received temperature information with the preset coiling temperature in the control unit, feeds back according to the comparison result, and controls the opening of the opening control valve 6 and the on and off of the on-off switch 5 under the combined action of the feedforward and the coiling temperature feedback, so that the real-time temperature control of the strip steel is finally realized. The present invention may also provide a production line provided with the cooling mechanism described above, the production line having a structure substantially as shown in fig. 1. The cooling mechanism 100 is arranged on a horizontal roller way at the outlet of the rolling mill and is positioned between the rolling mill mechanism 200 and the coiling mechanism 300, and a plurality of groups of pinch rolls 400 can be arranged between the cooling mechanism 100 and the coiling mechanism 200 and at the front side of the rolling mill mechanism 200 so as to clamp and convey the strip steel and keep the strip steel at a certain tension. (ii) a The rolling mill mechanism 200 is used to control the strip shape and thickness, and the coiling mechanism 300 is used to coil the strip for storage and transport.
As shown in fig. 6, a flow chart of a cooling method of a thin strip continuous casting strip cooling mechanism according to an embodiment of the present invention includes the following steps:
s1: configuring a cooling group, the number of cooling units in the cooling group and cooling modes according to the process requirements of the strip steel, wherein the cooling modes comprise aerosol cooling, laminar cooling and air-jet cooling;
s2: connecting the cooling units of each cooling group to the corresponding water channel pipeline or air channel pipeline according to the cooling mode configured in the step S1;
s3: according to the configuration of steps S1-S2, the control unit controls the opening of the opening control valve 6 and the on and off of the on-off switch of each cooling group electrically connected thereto, and performs a cooling operation; s4; when the cooling operation is completed, the respective on-off switches and the opening degree control valve 6 are closed.
In a preferred embodiment, step S3 may further include: the temperature detection device arranged on the roller way sends the detected temperature information of the strip steel to the control unit, the speed detection device arranged on the roller way sends the detected speed information of the strip steel to the control unit, and the control unit carries out feedforward control on the opening control valve 6 and the on-off switch 5 in each cooling group according to the received temperature information and speed information.
In addition, step S3 further includes: the curling mechanism positioned on one side of the cooling mechanism detects the curling temperature of the strip steel in real time, sends the detected temperature information to the control unit in communication connection with the curling mechanism, and the control unit compares the received temperature information with the preset curling temperature in the control unit and controls the opening of the opening control valve 6 and the on-off of the on-off switch 5 in a feedback mode according to the comparison result. Through the configuration, the real-time monitoring and detection of the temperature and the moving speed of the strip steel can be realized, and the control unit can perform feed-forward control on the opening control valve 6 and the on-off switch 5 of the cooling mechanism according to the received temperature and moving speed information so as to further adjust the flow and pressure of liquid or gas in each collecting main 2 and collecting branch 3 in each cooling unit 1, thereby adjusting the cooling effect in real time.
Wherein, in step S1, the method further comprises dividing the cooling section of the cooling mechanism into a rough cooling section and a fine cooling section, and in step S2, the method further comprises: connecting each cooling unit to a corresponding water path pipeline or gas path pipeline according to the division of the cooling section in the step S1, wherein at least three cooling units in the cooling group of the rough cooling section are controlled by one opening control valve; and at most two cooling units in the cooling units of the fine cooling section are controlled by one opening control valve together.
The above embodiments are only exemplary embodiments of the present invention, and are not intended to limit the present invention, and the scope of the present invention is defined by the claims. Various modifications and equivalents may be made by those skilled in the art within the spirit and scope of the present invention, and such modifications and equivalents should also be considered as falling within the scope of the present invention.
Claims (12)
1. A cooling mechanism for thin strip continuous casting strip steel is arranged on a horizontal roller way at an outlet of a casting and rolling machine and is positioned between a rolling machine mechanism and a curling mechanism, and is characterized in that a plurality of cooling groups are arranged in the cooling mechanism, each cooling group comprises at least one cooling unit, and the cooling mode of the cooling unit in each cooling group is a combination of aerial fog cooling, laminar cooling and air jet cooling; wherein the content of the first and second substances,
the cooling units are respectively positioned on the upper side and the lower side of the roller way and comprise header main paths connected to a water path pipeline and a gas path pipeline and at least two header branch paths communicated with the header main paths, a plurality of nozzles are arranged on the header branch paths, an on-off switch used for switching on or off the cooling unit is arranged on each header main path, and opening control valves used for controlling the flow rates of gas and liquid in the cooling unit are also arranged on the water path pipeline and the gas path pipeline;
the thin strip continuous casting strip steel cooling mechanism also comprises a rough cooling section cooling mechanism which is positioned in the rough cooling section and used for rough cooling and a fine cooling section cooling mechanism which is positioned in the fine cooling section and used for fine cooling; wherein, in the cooling units of each cooling group in the rough cooling section cooling mechanism, the header manifolds of at least three cooling units are controlled by one opening degree control valve; in the cooling units of each cooling group in the fine cooling section cooling mechanism, header manifolds of at most two cooling units are controlled by one opening degree control valve; the positions of the coarse cooling section cooling mechanism and the fine cooling section cooling mechanism can be interchanged and adjusted to meet different cooling process requirements; and the gas pipeline or the water pipeline is also provided with a homogenizer to uniformly control the cooling speed of each of the rough cooling section and the fine cooling section.
2. The thin strip cast strip cooling mechanism as claimed in claim 1, characterized in that: and the nozzles on two adjacent header branches on the same side in the cooling unit are respectively arranged in a staggered manner.
3. The thin strip cast strip cooling mechanism as claimed in claim 1, characterized in that: the joint structures between the header main circuits and the header branch circuits are the same, and the joint structures between the header main circuits and the water channel pipelines or the air channel pipelines are the same.
4. The thin strip cast strip cooling mechanism as claimed in claim 1, characterized in that: the shape of the nozzle outlet is rectangular, and one group of opposite sides of the rectangle are arc-shaped.
5. The thin strip cast strip cooling mechanism as claimed in claim 1, characterized in that: each on-off switch is an on-off control electromagnetic valve.
6. The thin strip cast strip cooling mechanism as claimed in claim 1, characterized in that: the range of the height of the nozzles on the header branch on the upper side of the roller way is 80-750 mm, the range of the height of the nozzles on the header branch on the lower side of the roller way is 50-550 mm, the range of the distance between two adjacent nozzles on the header branch on the upper side of the roller way is 50-700 mm, and the range of the distance between two adjacent nozzles on the header branch on the lower side of the roller way is 50-500 mm.
7. The thin strip cast strip cooling mechanism as claimed in claim 1, characterized in that: the cooling medium in the water path pipeline comprises water, and the cooling medium in the gas path pipeline comprises at least one of aerial fog, air and nitrogen.
8. The thin strip cast strip cooling mechanism as claimed in claim 1, characterized in that: the opening control valve and the on-off switch of each cooling group are electrically connected with a control unit so as to adjust the opening of the opening control valve and the on and off of the on-off switch.
9. The thin strip cast strip cooling mechanism as claimed in claim 8, characterized in that: the roller way is also provided with a temperature detection device for detecting the temperature of the strip steel on the roller way in real time and a speed detection device for detecting the moving speed of the strip steel, and the temperature detection device and the speed detection device are also in communication connection with the control unit;
the control unit is configured to perform feedforward adjustment control on the opening degree of the opening degree control valve and on and off of the on-off switch according to the received speed information and temperature information.
10. A cooling method of the thin strip continuous casting strip cooling mechanism according to any one of claims 1 to 9, characterized by: the method comprises the following steps:
s1: configuring a cooling group, the number of cooling units in the cooling group and cooling modes according to the process requirements of the strip steel, wherein the cooling modes comprise aerosol cooling, laminar cooling and air-jet cooling;
s2: connecting the cooling unit to the corresponding water channel pipeline or air channel pipeline according to the cooling mode configured in the step S1;
s3: according to the configuration of steps S1-S2, the control unit controls the opening of the opening control valve and the on and off of the on-off switch of each cooling group electrically connected thereto, and performs a cooling operation;
s4: when the cooling operation is completed, closing each on-off switch and the opening control valve; wherein the content of the first and second substances,
in step S1, the method further includes dividing the cooling section of the cooling mechanism into a rough cooling section and a fine cooling section, and in step S2, the method further includes: connecting each cooling unit to a corresponding water path pipeline or gas path pipeline according to the division of the cooling section in the step S1, wherein at least three cooling units in the cooling group of the rough cooling section are controlled by one opening control valve; at most two cooling units in the cooling units of the fine cooling section are controlled by one opening control valve together; and the gas pipeline or the water pipeline is also provided with a homogenizer to uniformly control the cooling speed of each of the rough cooling section and the fine cooling section.
11. The cooling method according to claim 10, characterized in that: step S3 further includes: the temperature detection device arranged on the roller way sends the detected temperature information of the strip steel to the control unit, the speed detection device arranged on the roller way sends the detected speed information of the strip steel to the control unit, and the control unit carries out feedforward control on the opening control valve and the on-off switch in each cooling group according to the received temperature information and speed information.
12. The cooling method according to claim 10, characterized in that: step S3 further includes: the coiling mechanism positioned on one side of the cooling mechanism detects the coiling temperature of the strip steel in real time, and sends the detected temperature information to the control unit in communication connection with the coiling mechanism, and the control unit compares the received temperature information with the preset coiling temperature in the control unit and performs feedback control according to the comparison result so as to adjust the opening of the opening control valve and the on-off of the on-off switch.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/CN2016/112006 WO2018119550A1 (en) | 2016-12-26 | 2016-12-26 | Thin-strip continuously-cast band steel cooling mechanism and cooling method therefor |
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| CN110087802A CN110087802A (en) | 2019-08-02 |
| CN110087802B true CN110087802B (en) | 2021-11-23 |
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| WO (1) | WO2018119550A1 (en) |
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| CN110202104B (en) * | 2019-05-27 | 2024-02-09 | 北京首钢国际工程技术有限公司 | Aerosol cooling device of 2+8 roller combined thick plate blank large-pressure casting and rolling machine |
| CN114011181B (en) * | 2022-01-04 | 2022-04-01 | 唐山瑞丰钢铁（集团）有限公司 | Dust suppression device and method for hot coil box |
| CN114669613B (en) * | 2022-04-19 | 2023-06-20 | 安徽工业大学 | Flexible roller contact type Bao Daizu cooling method |
| CN115647077B (en) * | 2022-12-09 | 2023-04-18 | 首钢智新迁安电磁材料有限公司 | Cold continuous rolling unit for improving temperature control precision and control method thereof |
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| CN110087802A (en) | 2019-08-02 |
| WO2018119550A1 (en) | 2018-07-05 |
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