Strip steel adaptive variable width energy-saving cooling device

Abstract

A strip steel adaptive variable width energy-saving cooling device, comprising a spray pipe group, a pneumatic element and a control system, the spray pipe group is divided into a fixed spray pipe group and a controllable spray pipe group, the fixed spray pipe group is always open and is arranged at the middle position of the strip steel, the controllable spray pipe group is two groups and is arranged at the left and right sides of the strip steel, the fixed spray pipes and the controllable spray pipes on the controllable spray pipe group and the fixed spray pipe group are arranged in a straight line or parallel straight lines along the width direction of the strip steel, an automatic control valve is installed on each controllable spray pipe, a strip steel position detection device is also installed at the left and right sides of the strip steel, when the strip steel position detection device detects that the width and position of the strip steel change and the strip steel passes by the position near the controllable spray pipe, the automatic control valve of the controllable spray pipe at the position is opened, and the controllable spray pipe cools the strip steel. The present application has the advantages of simple structure, high cooling efficiency, good energy-saving effect, easy implementation, high investment return ratio and the like, and is worth promoting.

Description

Technical Field

[0001] This invention belongs to the field of stainless steel production technology and relates to an adaptive variable width energy-saving cooling device for strip steel, used for cooling strip steel after annealing. Background Technology

[0002] In the continuous annealing process for strip steel, the strip steel after exiting the furnace needs to be rapidly cooled to room temperature before entering the next process. To meet the diverse needs of society, production organization often faces frequent switching between various width conditions. Existing continuous annealing cooling processes, to meet the production requirements of the widest and thickest strip steel, use cooling fans configured with the maximum cooling airflow to ensure effective cooling of all strip steel even under severe deviation. However, along the strip steel width direction, the total effective width of all nozzles far exceeds the actual width of the strip steel. This inevitably results in a significant portion of the nozzles being in an ineffective venting cooling state, leading to very low cooling efficiency and excessive energy consumption of fans or pumps.

[0003] The aforementioned traditional fixed-width cooling process technology is no longer adequate for the needs of modern steel energy-saving production processes. Therefore, it is necessary to upgrade it to be energy-efficient and design a new type of cooling device that can adapt to changes in strip width and position. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a strip steel adaptive variable width energy-saving cooling device with simple structure, high cooling efficiency and good energy-saving effect, in view of the above-mentioned technical status.

[0005] The technical solution adopted by the present invention to solve the above-mentioned technical problems is as follows: a strip adaptive variable width energy-saving cooling device, characterized in that: the cooling device includes a nozzle group, a pneumatic component and a control system, the nozzle group is divided into a fixed nozzle group and a controllable nozzle group, the fixed nozzle group is normally open and is arranged in the middle of the strip, the controllable nozzle group consists of two groups and is arranged on the left and right sides of the strip, the fixed nozzles and controllable nozzles on the controllable nozzle group and the fixed nozzle group are arranged in a straight line or parallel straight line along the width direction of the strip, each controllable nozzle is equipped with an automatic control valve, and strip position detection devices for detecting the width and actual position of the strip are also installed on the left and right sides of the strip, when the strip position detection device detects that the width and position of the strip have changed and that strip passes near the position of the controllable nozzle, the automatic control valve of the controllable nozzle at that position opens, and the controllable nozzle cools the strip.

[0006] As an improvement, the fixed nozzle assembly has two rows of fixed nozzles, one above the other, symmetrically distributed on the upper and lower surfaces of the strip. The distance between the nozzles of the fixed nozzles and the strip is between 120 and 300 mm, and the nozzle width L0 of the fixed nozzle assembly is greater than or equal to the average width L of the strip. 01 or the maximum allowable width L of the strip 02 70%~100%, that is, L0≧L 01 Or L0 = 0.7~1.0L 02 Two sets of controllable nozzles are symmetrically arranged on the left and right sides of the fixed nozzle set. Each set of controllable nozzles has 2 to 5 controllable nozzles at even intervals. Each controllable nozzle is arranged in two symmetrical rows, and the distance between the nozzle of the controllable nozzle and the strip is between 120 and 300 mm.

[0007] Furthermore, the strip position detection device consists of two sets, left and right, corresponding to the controllable nozzle group. The strip position detection device is installed at any position along the length of the strip movement from the inlet to the outlet of the unit's cooling section. The strip position detection device is a non-contact detection device, including photoelectric detection device, capacitor, inductor, ultrasonic detection or viewing angle sensor.

[0008] Furthermore, the strip position detection device is a photoelectric detection device, which includes a photoelectric emitting element group and a photoelectric detection element group. The photoelectric emitting element group and the photoelectric detection element group are arranged on the upper and lower surfaces of the strip and located on the upper and lower sides of the controllable nozzle group. The photoelectric emitting elements of the photoelectric emitting element group and the photoelectric detection elements of the photoelectric detection element group correspond one-to-one to form a photoelectric detection group. Each photoelectric detection group is evenly distributed at equal intervals along the straight direction of the strip width, and each photoelectric detection group corresponds one-to-one with each controllable nozzle of the controllable nozzle group. When the width and position of the strip change and any photoelectric detection group in the photoelectric detection device is blocked, the automatic control valve of the controllable nozzle corresponding to that photoelectric detection group opens, the cooling circuit is automatically turned on and the strip is cooled, while the control circuit of the controllable nozzle corresponding to the photoelectric detection group that is not blocked will remain in standby state.

[0009] Furthermore, the photoelectric emitting element group is arranged on the lower surface of the strip steel, and the photoelectric detection element group is arranged on the upper surface of the strip steel. The number of photoelectric detection groups corresponds to the controllable nozzle, and each pair of photoelectric detection groups works independently and controls the automatic control valve of the corresponding controllable nozzle.

[0010] Furthermore, the pneumatic component includes a fan, which is driven by a variable frequency speed control mode, and a pressure sensor for controlling the fan speed is installed on the main air duct of the fan.

[0011] Furthermore, the control system is also equipped with a control key that allows for the manual forced opening of the automatic control valves of the controllable nozzle assembly.

[0012] Furthermore, the cooling device is not limited to using fan-driven components for cooling; water cooling or mist cooling methods can also be used.

[0013] Finally, the total width of the nozzle assembly is 1.20 to 1.50 times the maximum width of the strip steel that the unit can produce.

[0014] Compared with existing technologies, the advantages of this invention are as follows: the nozzle assembly is divided into a fixed nozzle assembly and a controllable nozzle assembly, and a strip position detection device is provided. The fixed nozzle assembly is normally open, while the controllable nozzle assembly automatically adjusts its opening and closing according to changes in the strip width and position. This ensures that the cooling medium sprayed from all nozzles can effectively cool the strip, producing the best cooling effect. This greatly reduces the ineffective venting waste of nozzle flow, significantly reduces the effective flow load of the fan, and improves the fan's operating efficiency. This invention features a simple structure, high cooling efficiency, and good energy-saving effect. Under the condition of ensuring the same cooling effect on the strip, it can effectively reduce the fan air volume by more than 20% and reduce the fan power by about 50%. At the same time, the cooling device of this invention is easy to modify and implement, and has the advantages of high cost-effectiveness, making it worthy of widespread promotion. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of an embodiment of the present invention. Detailed Implementation

[0016] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0017] like Figure 1 As shown, an adaptive variable width energy-saving cooling device for strip steel includes a nozzle assembly, a pneumatic element 9, a strip steel position detection device, and a control system. The nozzle assembly is divided into a fixed nozzle assembly 2 and controllable nozzle assemblies 3 and 4. The fixed nozzle assembly 2 is normally open and is located in the middle of the strip steel 1. The controllable nozzle assemblies 3 and 4 are two sets located on the left and right sides of the strip steel 1. The fixed nozzles and controllable nozzles on the controllable nozzle assemblies 3 and 4, as well as the fixed nozzles and controllable nozzles on the fixed nozzle assembly 2, are arranged in a straight line or parallel straight line along the width direction of the strip steel 1. Each controllable nozzle is equipped with an automatic control valve F1 to F6. The strip steel position detection device is installed on the left and right sides of the strip steel 1 to detect the width and actual position of the strip steel 1. When the strip steel position detection device detects a change in the width and position of the strip steel 1, or when a piece of strip steel 1 passes near the position of a controllable nozzle, the automatic control valves F1 to F6 of the controllable nozzle at that position open, and the controllable nozzle cools the strip steel 1.

[0018] The specific structure is as follows: The fixed nozzle assembly 2 has two rows of fixed nozzles, one above the other, symmetrically distributed on the upper and lower surfaces of the strip 1. The distance between the nozzles of the fixed nozzles and the strip 1 is between 120 and 300 mm, with 150 to 200 mm being preferred. Too small a distance can easily scratch the strip 1, while too large a distance requires higher air pressure and results in higher energy consumption. The nozzle width L0 of the fixed nozzle assembly 2 is greater than or equal to the average width L of the strip 1. 01 or the maximum allowable width L of the strip 02 70%~100%, that is, L0≧L 01 Or L0 = 0.7~1.0L 02 Two sets of controllable nozzle groups 3 and 4 are symmetrically arranged on the left and right sides of the fixed nozzle group 2. Each set of controllable nozzle groups 3 and 4 has 2 to 5 controllable nozzles at even intervals. In this embodiment, there are three nozzles. The left controllable nozzle group 3 consists of branches S1 to S3, and the right controllable nozzle group 4 consists of branches S4 to S6. Each controllable nozzle is arranged symmetrically in two rows, one above the other. The distance between the nozzle of the controllable nozzle and the strip is between 120 and 300 mm, with 150 to 200 mm being preferred. If the distance is too small, it is easy to scratch the strip. If the distance is too large, the air pressure requirement is high and the energy consumption is high. A suitable distance is maintained between each controllable nozzle to ensure that when each controllable nozzle is opened at the same time, the cooling medium can be evenly distributed along the width direction of the strip 1, and to prevent the cooling areas of each controllable nozzle from overlapping and interfering with each other.

[0019] The strip position detection device consists of two sets, left and right, corresponding to the controllable nozzle groups 3 and 4. The strip position detection device is installed at any position along the length of the strip 1 moving from the inlet to the outlet of the unit's cooling section. The strip position detection device is a non-contact detection device, including photoelectric detection device, capacitor, inductor, ultrasonic detection or viewing angle sensor.

[0020] In this embodiment, the strip position detection device is a photoelectric detection device. The photoelectric detection device is more flexible in its arrangement and can be arranged separately from the controllable nozzle groups 3 and 4. However, in the width projection direction of the strip 1, they need to be adjacent to each other and correspond one-to-one to form a pair of control groups.

[0021] The photoelectric detection device includes a photoelectric emitting element group and a photoelectric detection element group. The photoelectric emitting element group is arranged on the lower surface of the strip steel 1 and below the controllable nozzle groups 3 and 4. The photoelectric detection element group is arranged on the upper surface of the strip steel 1 and above the controllable nozzle groups 3 and 4. The left photoelectric emitting element group 5 consists of three photoelectric emitting elements L1 to L3. The left photoelectric detection element group 7 consists of three photoelectric detection element groups E1 to E3. The right photoelectric emitting element group 6 consists of three photoelectric emitting elements L4 to L6. The right photoelectric detection element group 8 consists of three photoelectric detection elements E4 to E6. Photoelectric emitting element L1 and photoelectric detection element E1, photoelectric emitting element L2 and photoelectric detection element E2, etc., correspond one-to-one to form photoelectric detection groups. Each pair of photoelectric detection groups is evenly distributed at equal intervals along the straight line of the width of the strip steel 1. Each pair of photoelectric detection groups corresponds one-to-one with each controllable nozzle of the controllable nozzle groups 3 and 4. Each pair of photoelectric detection groups works independently and controls the automatic control valve of the corresponding controllable nozzle. When the width and position of strip 1 change and any photoelectric detection group in the photoelectric detection device is blocked, the automatic control valve 10 of the controllable nozzle corresponding to that photoelectric detection group will open, the cooling circuit will automatically start and cool strip 1, while the control circuit of the controllable nozzle corresponding to the photoelectric detection group that is not blocked will remain in standby mode.

[0022] The pneumatic component 9 includes a fan, which is driven by a variable frequency drive. A pressure sensor 10 is installed on the main air duct 12 of the fan to control the fan speed. The pneumatic component 9 can be controlled by air pressure or by a system-set target temperature. It is controlled according to the system-set target pressure value and the detection value of the pressure sensor 10. When the detected value is lower than the target pressure setting value, the fan speeds up until it stabilizes at the target detection value; and vice versa.

[0023] To increase the flexibility of the control system, a control key is also provided in the control system to enable manual forced opening of the automatic control valves F1 to F6 of the controllable nozzle groups 3 and 4. Any of the automatic control valves F1 to F6 can be manually forced open to deal with various abnormal states of the system.

[0024] The cooling device is not limited to using the fan-driven element 9 for cooling; water cooling or mist cooling methods can also be used, with a water pump replacing the fan.

[0025] The total width of the nozzle assembly is 1.20 to 1.50 times the maximum width of the strip steel that the unit can produce.

[0026] The working principle is as follows:

[0027] Under normal circumstances, the fixed nozzle group 2 can independently meet more than 80% of the strip steel production process. Under this condition, the Ln-En (n=1~6) photoelectric detection group is in the conducting state, and current flows through each phototube. The control valves Fn (n=1~6) are all in the normally closed state, and the controllable nozzle groups 3 and 4 are in the open circuit state. The cooling medium cools the strip steel through the fixed nozzle group 2.

[0028] When the width L1 of strip 1 is greater than L0, and the light from photoelectric emitting element L3 or L4 is blocked by strip 1, and no light enters photoelectric receiving element E3 or E4, the signal of the photoelectric detection group triggers the program control condition. The controller issues a command to open the automatic control valve F3 or F4, thereby activating the cooling function of the controllable cooling nozzle S3 or S4. Similarly, when the width of strip 1 is wide enough to block any photoelectric detection element in the photoelectric detection group, the control cooling circuit corresponding to any position will be automatically activated by the control system to cool the strip, while the control circuits that are not blocked will remain in standby mode.

[0029] Regardless of the reason, if the light path of any photoelectric detection group is blocked, the automatic control valve of the controllable nozzle at that position will be opened by the control system, and the cooling medium will be in a conducting state to cool the strip. If the light path of all photoelectric detection groups is blocked, all controllable nozzles will be opened, and their cooling nozzles will all participate in cooling the strip. If no photoelectric detection group is blocked, all controllable nozzles will eventually be closed, and controllable nozzle groups 3 and 4 will be in a standby state, with the cooling function of the fixed nozzle group 2 completing the cooling function of the strip.

[0030] The following describes the arrangement and requirements for strip cooling after the entire annealing furnace in this embodiment:

[0031] Arrangement requirements for nozzle groups: Generally, the strip cooling process section after the annealing furnace consists of 3 to 5 independent cooling devices as described in this embodiment. Each section has an independent power supply, piping network, nozzles, and control system. Each section can be constructed using the aforementioned nozzle groups. To simplify the system structure and save investment, within the same cooling process section, several different cooling rows Qn, located at the same position, are connected in parallel along the width direction, with controllable cooling nozzles at the same position number Sn. Their cooling adjustment function is controlled by the same automatic valve. The nozzles symmetrically distributed on the upper and lower surfaces of the strip at the same width position are simultaneously opened and closed, or further simplified to be controlled by the same automatic valve. It should be noted that within the same cooling section, several rows of controllable nozzle groups arranged along the length direction of the strip are controlled by different automatic valves at different width positions. The controllable nozzle groups on the left and right sides of the strip are considered to be at different positions and are controlled by different control valves.

[0032] Strip position detection requirements: The strip position detection device is used to detect the strip width and the actual position of the strip on the unit's centerline. Generally, only one strip position detection device needs to be installed along the length of the strip in the cooling section of the same unit. Various non-contact detection devices can be selected according to actual needs, such as photoelectric detection devices, capacitors, inductors, ultrasonic detectors, or viewing angle sensors, as long as they can detect the strip width and actual position in real time. It can be flexibly installed at any position along the length of the strip's movement from the inlet to the outlet of the unit's cooling section.

[0033] System control features: The fan (or water pump) is the power unit of the cooling system, driven by a variable frequency speed control system. A pressure sensor is installed on the main fan duct, which controls the fan speed. When the pressure sensor reading reaches the system target setting, the fan speed stabilizes at that speed. When the reading is lower than the system setting, the fan speed increases until the pressure sensor reading reaches the system setting, at which point the fan stabilizes at that speed, and vice versa. Similarly, fan flow control can also be conveniently achieved by setting the target cooling temperature using a strip steel.

[0034] Energy-saving principle and usage: The energy-saving usage of the nozzle cooling system constructed as described above is as follows: Generally, the strip cooling function, which is mainly based on fixed nozzles and supplemented by controllable nozzles, can meet more than 80% of the normal production time requirements under normal production conditions by the fixed nozzle group alone. It can also meet the strip cooling production process requirements of strips with an average width of more than 70% to 100% of the maximum width. The working state of the controllable nozzle group is determined by the strip position signal detected by the strip position detection element. When the position detection element detects that strip passes near any controllable nozzle position, the automatic valve of the controllable nozzle corresponding to that position opens, and the cooling circuit is connected. The control valve of the nozzle corresponding to the position where no strip passes will remain in the normally closed state, and the cooling circuit will be disconnected.

[0035] Under certain production conditions, if the strip width is greater than the average width (or the set width of the fixed nozzle group), in addition to the fixed nozzle group working independently, some or all of the controllable nozzle group must also participate in cooling the strip. In this case, the controllable nozzle group corresponding to the strip position detection will control its automatic valve to open and participate in the strip cooling. The controllable nozzles that are not detected by the strip position sensor will have their valves closed and will not participate in the strip cooling.

[0036] Similarly, under certain production conditions, if the strip deviates from the centerline due to various reasons, and the corresponding controllable nozzle valve is automatically opened when the strip passes through that location, the controllable nozzle will begin to cool the strip. The controllable nozzle group that is not blocked by the strip will keep its control valve closed. In this way, all the flow will be used for strip cooling, and there will be no waste of excessive cooling medium.

[0037] in conclusion:

[0038] Regardless of the various operating conditions described above, the cooling device in this embodiment can adapt well to various situations that occur in production, produce the best cooling effect, greatly reduce the ineffective venting waste of nozzle flow, and improve the operating efficiency of the fan.

[0039] Generally, the total time for all or part of the nozzles in the controllable nozzle assembly to participate in strip cooling should be set to 5% to 30% of the total cooling time of production, which is in line with the principle of setting time for energy-saving statistics.

[0040] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A strip steel adaptive variable width energy-saving cooling device, characterized in that: The cooling device includes a nozzle assembly, pneumatic components, and a control system. The nozzle assembly is divided into a fixed nozzle assembly and a controllable nozzle assembly. The fixed nozzle assembly is normally open and is located in the middle of the strip. There are two controllable nozzle assemblies, located on the left and right sides of the strip. The fixed and controllable nozzles on both the fixed and controllable nozzle assemblies are arranged in a straight line or parallel line along the width direction of the strip. Each controllable nozzle is equipped with an automatic control valve. On the left and right sides of the strip, there are also strip position detection devices for detecting the width and actual position of the strip. When the strip position detection device detects a change in the width and position of the strip, or when strip passes near the position of a controllable nozzle, the automatic control valve of the controllable nozzle at that position opens, and the controllable nozzle cools the strip. The fixed nozzle assembly has two rows of fixed nozzles, one above the other, symmetrically distributed on the upper and lower surfaces of the strip. The distance between the nozzles of the fixed nozzles and the strip is between 120 and 300 mm. The nozzle width L0 of the fixed nozzle assembly is greater than or equal to the average width L of the strip. 01 or the maximum allowable width L of the strip 02 70%~100%, that is, L0≧L 01 Or L0 = 0.7~1.0L 02 Two sets of controllable nozzle groups are symmetrically arranged on the left and right sides of the fixed nozzle group. Each set of controllable nozzle groups has 2 to 5 controllable nozzles at even intervals. Each controllable nozzle is arranged in two symmetrical rows, and the distance between the nozzle of the controllable nozzle and the strip is between 120 and 300 mm. The strip position detection device consists of two sets, left and right, corresponding to the controllable nozzle group. The strip position detection device is installed at any position along the length of the strip movement from the inlet to the outlet of the unit's cooling section. The strip position detection device is a non-contact detection device, including photoelectric detection device, capacitor, inductor, ultrasonic detection or viewing angle sensor.

2. The strip adaptive variable width energy-saving cooling device according to claim 1, characterized in that: The strip position detection device uses a photoelectric detection device, which includes a photoelectric emitting element group and a photoelectric detection element group. The photoelectric emitting element group and the photoelectric detection element group are arranged on the upper and lower surfaces of the strip and located on the upper and lower sides of the controllable nozzle group. The photoelectric emitting element group and the photoelectric detection element group correspond one-to-one to form a photoelectric detection group. Each photoelectric detection group is evenly distributed at equal intervals along the straight direction of the strip width, and each photoelectric detection group corresponds one-to-one with each controllable nozzle of the controllable nozzle group. When the strip width and position change and any photoelectric detection group in the photoelectric detection device is blocked, the automatic control valve of the controllable nozzle corresponding to that photoelectric detection group opens, the cooling circuit automatically starts and cools the strip, while the control circuit of the controllable nozzle corresponding to the unblocked photoelectric detection group remains in standby mode.

3. The adaptive variable width energy-saving cooling device for strip steel according to claim 2, characterized in that: The photoelectric emitting element group is arranged on the lower surface of the strip steel, and the photoelectric detection element group is arranged on the upper surface of the strip steel. The number of photoelectric detection groups corresponds to the controllable nozzle. Each pair of photoelectric detection groups works independently and controls the automatic control valve of the corresponding controllable nozzle.

4. The strip adaptive variable width energy-saving cooling device according to any one of claims 1 to 3, characterized in that: The pneumatic components include a fan, which is driven by a variable frequency speed control mode, and a pressure sensor for controlling the fan speed is installed on the main air duct of the fan.

5. The strip adaptive variable width energy-saving cooling device according to any one of claims 1 to 3, characterized in that: The control system is also equipped with a control button that allows for the manual forced opening of the automatic control valves of the controllable nozzle assembly.

6. The strip adaptive variable width energy-saving cooling device according to any one of claims 1 to 3, characterized in that: The cooling device is not limited to using fan-driven components for cooling; it can also use water cooling or mist cooling methods.

7. The strip adaptive variable width energy-saving cooling device according to any one of claims 1 to 3, characterized in that: The total width of the nozzle assembly is 1.20 to 1.50 times the maximum width of the strip steel that the unit can produce.

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