Steel rolling temperature control method and temperature control device

Abstract

The embodiment of the invention discloses a rolled steel temperature control method and device, and relates to the field of steel manufacturing process.The rolled steel temperature control method comprises the steps that the overall surface temperature of rolled steel is detected, temperature information corresponding to the overall surface temperature is generated, and the temperature information is sent to a control center; the control center controls front cooling equipment to perform a first-stage cooling process on the rolled steel according to the temperature information, and temperature detection is performed on the rolled steel after the first-stage cooling process; the rolled steel enters temperature adjusting equipment, the temperature adjusting equipment controls the temperature of the rolled steel according to preset temperature information and the temperature of the rolled steel after the primary cooling process, whether the surface temperature of the rolled steel reaches the preset temperature information or not is judged, and judgment information and temperature difference information are generated; and the control center controls the post-cooling equipment to perform secondary cooling on the rolled steel according to the judgment information and the temperature difference information, and performs temperature detection on the rolled steel subjected to secondary cooling, so that the surface temperature of the rolled steel can be accurately controlled through the process.

Description

Technical Field

[0001] The present application relates to the field of steel manufacturing processes, and in particular to a steel rolling temperature control method and a temperature control device. Background Art

[0002] In the steel rolling production process, temperature control is one of the key factors that determine product quality and production efficiency. With the development of modern industry and the advancement of technology, the requirements for steel rolling temperature control are getting higher and higher. Traditional temperature control mainly relies on experience and manual adjustment, and there are problems such as low control accuracy and low efficiency. Therefore, researching and developing advanced temperature control technology to improve the accuracy and stability of steel rolling temperature control has become an important topic in the steel industry.

[0003] Therefore, how to achieve precise control of the temperature of steel rolling is an important technical problem that needs to be solved urgently. Summary of the invention

[0004] In order to solve the problems existing in the prior art, the present invention provides a steel rolling temperature control method and a temperature control device, wherein a steel rolling temperature control method comprises:

[0005] Step 1: Detect the overall surface temperature of the rolled steel, generate corresponding temperature information from the overall surface temperature, and send the temperature information to the control center;

[0006] Step 2: The control center controls the pre-cooling equipment to perform a primary cooling process on the rolled steel according to the temperature information, and performs temperature detection on the rolled steel after the primary cooling process;

[0007] Step 3: The rolled steel enters a temperature control device, which controls the temperature of the rolled steel according to preset temperature information and the temperature after the primary cooling process of the rolled steel, and determines whether the surface temperature of the rolled steel reaches the preset temperature information, and generates determination information and temperature difference information;

[0008] Step 4: The control center controls the post-cooling equipment to perform secondary cooling on the rolled steel according to the judgment information and the temperature difference information, and performs temperature detection on the rolled steel after the secondary cooling.

[0009] Optionally, in some embodiments of the present application, in the step 1, the generating of the temperature information includes:

[0010] Step 101: detecting the upper surface temperature and the lower surface temperature of the rolled steel by temperature detection devices arranged at both sides of the rolled steel;

[0011] Step 102: The temperature control terminal receives the upper surface temperature and the lower surface temperature and calculates and generates the overall surface temperature of the rolled steel and the temperature difference between the upper surface temperature and the lower surface temperature;

[0012] Step 103: The temperature control terminal integrates the overall surface temperature and the temperature difference into the temperature information.

[0013] Optionally, in some embodiments of the present application, the primary cooling process includes:

[0014] Step 201: The control center determines the positive or negative value of the temperature difference. When the upper surface temperature is higher than the lower surface temperature, the temperature difference is positive; when the upper surface temperature is lower than the lower surface temperature, the temperature difference is negative.

[0015] Step 202: When the control center determines that the temperature difference is positive, the control center controls the front cooling device to cool down the upper surface of the rolled steel; when the control center determines that the temperature difference is negative, the control center controls the front cooling device to cool down the lower surface of the rolled steel;

[0016] Step 203: A temperature sensor is provided in the front-cooling device. When the temperature sensor detects that the upper surface temperature of the rolled steel is equal to the lower surface temperature, the front-cooling device stops cooling the upper surface or lower surface of the rolled steel; when the temperature sensor detects that the upper surface temperature of the rolled steel is lower than the lower surface temperature, the front-cooling device cools the lower surface of the rolled steel until the upper surface temperature is equal to the lower surface temperature; when the temperature sensor detects that the upper surface temperature of the rolled steel is higher than the lower surface temperature, the front-cooling device cools the upper surface of the rolled steel until the upper surface temperature is equal to the lower surface temperature.

[0017] Optionally, in some embodiments of the present application, the temperature control device controls the temperature of the rolled steel, including:

[0018] Step 301: the rolled steel passes through a plurality of temperature control zones of the temperature regulating device in sequence, and the plurality of temperature control zones respectively control the temperature of the upper and lower surfaces of the rolled steel;

[0019] Step 302: Detecting the surface temperature of each rolled steel passing through the temperature control zone by a temperature detector at the end of each temperature control zone, and generating judgment information and temperature difference information based on the comparison between the surface temperature and the preset temperature information;

[0020] Step 303: The next temperature control zone heats up and cools down the upper and lower surfaces of the rolled steel according to the judgment information and the temperature difference information, so that the upper surface temperature and the lower surface temperature of the rolled steel are the same and meet the preset temperature.

[0021] Optionally, in some embodiments of the present application, the secondary cooling is judged and executed based on the temperature information at the outlet of the temperature control equipment. When the temperature of the rolled steel reaches the preset temperature information, the control center stops controlling the post-cooling equipment to perform secondary cooling on the rolled steel; when the temperature of the rolled steel is higher than the preset temperature information, the control center controls the post-cooling equipment to perform secondary cooling on the rolled steel.

[0022] Optionally, in some embodiments of the present application, a temperature control device is further provided, the temperature control device is used to perform any one of the above steel rolling temperature control methods, the temperature control device comprises a front cooling device, a rear cooling device, a temperature regulating device and a transmission roller, wherein the front cooling device, the temperature regulating device and the rear cooling device are linearly arranged on the transmission roller in sequence;

[0023] The front cooling device and the rear cooling device both include an upper high-pressure nozzle and a lower high-pressure nozzle, the upper high-pressure nozzle and the lower high-pressure nozzle are respectively arranged at the upper and lower ends of the rolled steel, and the spraying directions of the upper high-pressure nozzle and the lower high-pressure nozzle are arranged along the moving direction of the rolled steel;

[0024] The temperature control equipment is provided with a plurality of temperature control zones, which are linearly arranged along the moving direction of the rolled steel. Two heating elements are arranged in each temperature control zone, and the two heating elements are respectively arranged at the upper surface and the lower surface of the rolled steel.

[0025] Optionally, in some embodiments of the present application, a plurality of the upper high-pressure nozzles and the lower high-pressure nozzles are provided, and the plurality of the upper high-pressure nozzles and the plurality of the lower high-pressure nozzles are linearly arranged, and the arrangement direction is perpendicular to the moving direction of the steel rolling.

[0026] Optionally, in some embodiments of the present application, the spray pressure of the upper high-pressure nozzle and the lower high-pressure nozzle is 2.6MPa-4.0MPa.

[0027] Compared with the prior art, the beneficial effects of the present invention are:

[0028] In the embodiment of the present application, the temperature of the rolled steel is controlled by providing a front cooling device, a temperature regulating device and a rear cooling device, so that the temperature of the upper and lower surfaces of the rolled steel can be accurately controlled to avoid the temperature difference causing the rolled steel performance to be affected;

[0029] The upper and lower high-pressure nozzles on the front cooling equipment and the rear cooling equipment set up at the same time can greatly reduce the surface temperature of the rolled steel and improve work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0031] Figure 1 A schematic diagram of the overall process of the steel rolling temperature control method provided in an embodiment of the present application;

[0032] Figure 2 A schematic diagram of a process for generating temperature information provided in an embodiment of the present application;

[0033] Figure 3 A schematic diagram of a primary cooling process provided in an embodiment of the present application;

[0034] Figure 4 A schematic diagram of a process for controlling the temperature of steel rolling using the temperature control equipment provided in an embodiment of the present application. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments of the present application, all other embodiments obtained by ordinary technicians in this field without making creative work belong to the protection scope of the present application. It is understood that the drawings are only provided for reference and illustration, and are not used to limit the present application. The connection relationship shown in the drawings is only for the convenience of clear description and does not limit the connection method.

[0036] Specifically, if Figure 1-4 As shown, the embodiment of the present application provides a steel rolling temperature control method, which appropriately cools down the steel refined by the furnace, and the specific cooling process includes:

[0037] Step 1: Detect the overall surface temperature of the rolled steel, generate corresponding temperature information from the overall surface temperature, and send the temperature information to the control center;

[0038] Step 2: The control center controls the pre-cooling equipment to perform a primary cooling process on the rolled steel according to the temperature information, and performs temperature detection on the rolled steel after the primary cooling process;

[0039] Step 3: The rolled steel enters a temperature control device, which controls the temperature of the rolled steel according to preset temperature information and the temperature after the primary cooling process of the rolled steel, and determines whether the surface temperature of the rolled steel reaches the preset temperature information, and generates determination information and temperature difference information;

[0040] Step 4: The control center controls the post-cooling equipment to perform secondary cooling on the rolled steel according to the judgment information and the temperature difference information, and performs temperature detection on the rolled steel after the secondary cooling.

[0041] In the above steps, more specifically:

[0042] A conveying roller is provided, on which the rolled steel is constantly moving. In step 1, the surface temperature of the rolled steel on the conveying roller needs to be detected to determine the overall temperature size or range of the rolled steel, so as to obtain the corresponding surface temperature of the rolled steel and further calculate the corresponding temperature information;

[0043] The generation of the temperature information is calculated based on a temperature detector device arranged in the moving direction of the steel rolling. The temperature detection device is an armored thermocouple in the embodiment of the present application. The temperature measurement range of the thermocouple is usually between -200°C and 1150°C, which can effectively and timely measure the surface temperature of the steel rolling. Since the steel rolling is affected by the environment when it comes out of the furnace, a certain temperature difference will be generated on the upper and lower surfaces of the steel rolling. The temperature difference is usually around 2-10°C, which will have a certain impact on the quality of the steel rolling and the product quality. At the same time, when the temperature is greatly reduced to around 920 degrees Celsius or to normal room temperature in the later stage, a very large temperature difference will be generated on the upper and lower surfaces of the steel rolling, which will seriously affect the quality of the steel rolling.

[0044] To avoid the occurrence of the above process, it is necessary to monitor the temperature values ​​of the upper and lower surfaces of the rolled steel at all times. When the corresponding temperature value is detected, the temperature value is transmitted to the temperature control terminal. The temperature control terminal obtains the corresponding overall surface temperature based on the upper and lower surface temperatures of the rolled steel and the average of the upper and lower surface temperatures. The overall surface temperature is stored as temperature information. At the same time, the temperature difference value between the upper and lower surface temperatures also needs to be calculated and stored as temperature information.

[0045] After the above is completed, the temperature control terminal transmits the temperature information to the control center, and the control center controls the front cooling device to perform a primary cooling process after receiving the temperature information.

[0046] During the primary cooling process:

[0047] Two rows of high-pressure nozzles are arranged in the front cooling equipment, and the two rows of high-pressure nozzles are erected at the upper and lower positions of the steel rolling through a support frame, forming an upper high-pressure nozzle and a lower high-pressure nozzle respectively, and the spraying direction of the high-pressure nozzle is set along the moving direction of the steel rolling, and in the present application, the high-pressure nozzle is connected to the high-pressure water tank, the pressure of the sprayed water is 2.6MPa-4.0MPa, and the spraying direction is set along the moving direction of the steel rolling, and the directions of the upper and lower high-pressure nozzles are consistent, and the number of the upper and lower high-pressure nozzles is 18, and the arrangement direction of the 18 nozzles is perpendicular to the moving direction of the steel rolling.

[0048] The flushing of its high-pressure nozzle can greatly reduce the temperature of the rolled steel surface. Compared with conventional cooling, after the cooling water falls on the surface of the hot steel plate, it immediately boils and vaporizes to form a vapor film on the interface between the cooling water and the steel plate. Since the heat transfer coefficient between the vapor film and the steel plate is much smaller than the heat transfer coefficient between water and the steel plate, the existence of the vapor film affects the heat transfer efficiency, which limits the further improvement of the cooling speed.

[0049] In this application, the occurrence of this situation can be largely avoided by using a high-pressure nozzle, and the temperature of the steel rolling can be reduced by more than 100 degrees Celsius within an extreme time, to around 900 degrees Celsius, which facilitates further processing of the steel rolling and greatly improves the performance of the steel rolling.

[0050] In the above, when a difference between the upper surface temperature and the lower surface temperature is detected, the control center determines the positive or negative value of the temperature difference. When the upper surface temperature is higher than the lower surface temperature, the temperature difference is positive; when the upper surface temperature is lower than the lower surface temperature, the temperature difference is negative;

[0051] When the control center determines that the temperature difference is positive, the control center controls the front cooling equipment to cool down the upper surface of the rolled steel; when the control center determines that the temperature difference is negative, the control center controls the front cooling equipment to cool down the lower surface of the rolled steel;

[0052] The upper and lower surface temperatures of the rolled steel can be detected by the temperature sensor in the front cooling equipment. When the temperature sensor detects that the upper surface temperature of the rolled steel is equal to the lower surface temperature, the front cooling equipment stops cooling the upper or lower surface of the rolled steel.

[0053] This process can greatly make the upper surface temperature of the rolled steel the same as the lower surface temperature, but due to the instability of its high-pressure nozzle to a certain extent, there is a probability that the upper surface temperature is different from the lower surface temperature. At this time, the rolled steel needs to enter the temperature control equipment, and the temperature control equipment is provided with multiple temperature control zones, and the multiple temperature control zones respectively control the temperature of the upper and lower surfaces of the rolled steel; at the end of each temperature control zone, the surface temperature of each rolled steel passing through the temperature control zone is detected by a temperature detector, and the surface temperature is compared with the preset temperature information to generate judgment information and temperature difference information; the next temperature control zone heats up and cools the upper and lower surfaces of the rolled steel according to the judgment information and the temperature difference information, so that the upper surface temperature and the lower surface temperature of the rolled steel are the same and meet the preset temperature.

[0054] After the rolled steel passes through the temperature control equipment, its temperature basically meets the required temperature. In the embodiment of the present application, the structure of the post-cooling equipment is the same as that of the pre-cooling equipment. At the same time, its secondary cooling is judged and executed through the temperature information at the outlet of the temperature control equipment. When the temperature of the rolled steel reaches the preset temperature information, the control center stops controlling the post-cooling equipment to perform secondary cooling on the rolled steel; when the temperature of the rolled steel is higher than the preset temperature information or the rolled steel needs to be completely cooled, the control center controls the post-cooling equipment to perform secondary cooling on the rolled steel.

[0055] After completing the secondary cooling of the rolled steel, the temperature control process of the rolled steel is basically completed.

[0056] The above embodiments are only used to illustrate the technical method of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical method of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical method of the present invention.

Claims

1. A steel rolling temperature control method, characterized in that: include: Step 1: Detect the overall surface temperature of the rolled steel, generate corresponding temperature information from the overall surface temperature, and send the temperature information to the control center; Step 2: The control center controls the pre-cooling equipment to perform a primary cooling process on the rolled steel according to the temperature information, and performs temperature detection on the rolled steel after the primary cooling process; Step 3: The rolled steel enters a temperature control device, which controls the temperature of the rolled steel according to preset temperature information and the temperature after the primary cooling process of the rolled steel, and determines whether the surface temperature of the rolled steel reaches the preset temperature information, and generates determination information and temperature difference information; Step 4: The control center controls the post-cooling equipment to perform secondary cooling on the rolled steel according to the judgment information and the temperature difference information, and performs temperature detection on the rolled steel after the secondary cooling.

2. A steel rolling temperature control method according to claim 1, characterized in that: In the step 1, the generation of the temperature information includes: Step 101: detecting the upper surface temperature and the lower surface temperature of the rolled steel by a temperature detection device; Step 102: The temperature control terminal receives the upper surface temperature and the lower surface temperature and calculates and generates the overall surface temperature of the rolled steel and the temperature difference between the upper surface temperature and the lower surface temperature; Step 103: The temperature control terminal integrates the overall surface temperature and the temperature difference into the temperature information.

3. A steel rolling temperature control method according to claim 2, characterized in that: The primary cooling process comprises: Step 201: The control center determines the positive or negative value of the temperature difference. When the upper surface temperature is higher than the lower surface temperature, the temperature difference is positive; when the upper surface temperature is lower than the lower surface temperature, the temperature difference is negative. Step 202: When the control center determines that the temperature difference is positive, the control center controls the front cooling device to cool down the upper surface of the rolled steel; when the control center determines that the temperature difference is negative, the control center controls the front cooling device to cool down the lower surface of the rolled steel; Step 203: A temperature sensor is provided in the pre-cooling device. When the temperature sensor detects that the upper surface temperature of the rolled steel is equal to the lower surface temperature, the pre-cooling device stops cooling the upper surface or the lower surface of the rolled steel.

4. A steel rolling temperature control method according to claim 1, characterized in that: The temperature control device for the rolled steel comprises: Step 301: the rolled steel passes through a plurality of temperature control zones of the temperature regulating device in sequence, and the plurality of temperature control zones respectively control the temperature of the upper and lower surfaces of the rolled steel; Step 302: Detecting the surface temperature of each rolled steel passing through the temperature control zone by a temperature detector at the end of each temperature control zone, and generating judgment information and temperature difference information based on the comparison between the surface temperature and the preset temperature information; Step 303: The next temperature control zone heats up and cools down the upper and lower surfaces of the rolled steel according to the judgment information and the temperature difference information, so that the upper surface temperature and the lower surface temperature of the rolled steel are the same and meet the preset temperature.

5. A steel rolling temperature control method according to claim 4, characterized in that: The secondary cooling is judged and executed by the temperature information at the outlet of the temperature regulating device. When the temperature of the rolled steel reaches the preset temperature information, the control center stops controlling the post-cooling device to perform secondary cooling on the rolled steel. When the temperature of the rolled steel is higher than the preset temperature information, the control center controls the post-cooling equipment to perform secondary cooling on the rolled steel.

6. A temperature control device, used to execute a steel rolling temperature control method according to any one of claims 1 to 5, characterized in that: The temperature control device comprises a front cooling device, a rear cooling device, a temperature regulating device and a transmission roller, wherein the front cooling device, the temperature regulating device and the rear cooling device are linearly arranged on the transmission roller in sequence; The front cooling device and the rear cooling device both include an upper high-pressure nozzle and a lower high-pressure nozzle, the upper high-pressure nozzle and the lower high-pressure nozzle are respectively arranged at the upper and lower ends of the rolled steel, and the spraying directions of the upper high-pressure nozzle and the lower high-pressure nozzle are arranged along the moving direction of the rolled steel; The temperature control equipment is provided with a plurality of temperature control zones, which are linearly arranged along the moving direction of the rolled steel. Two heating elements are arranged in each temperature control zone, and the two heating elements are respectively arranged at the upper surface and the lower surface of the rolled steel.

7. A temperature control device according to claim 6, characterized in that: There are multiple upper high-pressure nozzles and multiple lower high-pressure nozzles, and the multiple upper high-pressure nozzles and the multiple lower high-pressure nozzles are arranged linearly, and the arrangement direction is perpendicular to the moving direction of the rolled steel.

8. A temperature control device according to claim 6, characterized in that: The spray pressure of the upper high-pressure nozzle and the lower high-pressure nozzle is 2.6MPa-4.0MPa.

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