Oriented silicon steel normalizing pickling temperature control system and control method thereof

Abstract

The invention belongs to the technical field of silicon steel processing, and discloses an oriented silicon steel normalizing pickling temperature control system and a control method thereof.The system comprises an acid tank, a conveying device, a spraying device, a circulating tank, a reflux pump, a conveying pump, a temperature adjusting device and an upper computer; the upper computer is used for controlling the temperature adjusting device and the conveying pump according to detection results of the temperature sensors, so that the temperature of the acid liquid in the acid tank is accurately controlled, and meanwhile, different environment temperature conditions can be adapted; the device has the advantages of accurately controlling the temperature of the acid liquor in the acid tank, adapting to different environment temperature conditions, and improving the pickling effect and the production efficiency.

Description

Technical Field

[0001] The present application relates to the technical field of silicon steel processing, and in particular to a temperature control system and a control method for normalizing pickling of oriented silicon steel. Background Art

[0002] After normalizing, oriented silicon steel (generally steel strip) needs to be pickled with hydrochloric acid. The pickling process is usually carried out using a pickling system, and its basic working process is: hydrochloric acid is heated in a circulation tank and sprayed on the surface of the steel strip through a spray device and flows into the acid tank. At the same time, the steel strip is immersed in the acid tank, and the hydrochloric acid in the acid tank flows out of the acid tank through overflow and returns to the circulation tank, and the hydrochloric acid circulates in this way to achieve pickling of the steel strip. In this process, the pickling temperature has an important influence on the pickling effect.

[0003] However, there are some problems with the existing pickling system. First, the existing system only sets a temperature detector at the outlet of the heating device to detect the temperature of the hydrochloric acid, and adjusts the temperature of the hydrochloric acid at the outlet of the heating device to the target temperature based on the detection result of the temperature detector. This causes the temperature of the hydrochloric acid in the acid tank to be significantly different from the target temperature, usually lower than the target temperature, thereby affecting the pickling effect. Secondly, the existing system only sets a heating device at the outlet of the circulation tank. When the ambient temperature is too high and the temperature of the hydrochloric acid in the circulation tank is too high, the system cannot cool down the hydrochloric acid, which also affects the pickling effect.

[0004] These problems seriously affect the pickling quality and production efficiency of oriented silicon steel. Therefore, the existing technology needs to be improved to achieve more accurate temperature control and more efficient pickling process. Summary of the invention

[0005] The purpose of the present application is to provide a temperature control system and a control method for normalizing pickling of oriented silicon steel, which can accurately control the temperature of the acid solution in the acid tank, adapt to different ambient temperature conditions, and improve the pickling effect.

[0006] In a first aspect, the present application provides a temperature control system for normalizing pickling of oriented silicon steel, comprising: An acid tank, used for storing acid liquid, wherein at least one first temperature sensor is provided in the acid tank for detecting the temperature of the acid liquid; A transport device for continuously feeding the steel strip into and out of the acid tank; A spraying device, arranged in the acid tank and used for spraying acid liquid on both sides of the steel strip; A circulation tank, used for storing the acid solution refluxed from the acid tank, wherein at least one second temperature sensor is provided in the circulation tank for detecting the temperature of the acid solution; A reflux pump, used for conveying the acid solution in the acid tank to the circulation tank; A delivery pump, used for delivering the acid solution in the circulation tank to the spraying device; A temperature regulating device is arranged between the delivery pump and the spraying device, and is capable of adjusting the temperature of the acid solution upward and downward. A third temperature sensor is arranged at the outlet of the temperature regulating device to detect the temperature of the acid solution. The host computer is electrically connected to the first temperature sensor, the second temperature sensor, the third temperature sensor, the reflux pump, the delivery pump and the temperature control device, and is used to control the temperature control device and the delivery pump according to the detection results of each temperature sensor, so that the temperature of the acid liquid in the acid tank is stabilized at the target temperature, and the temperature of the acid liquid at the outlet of the temperature control device does not exceed the process set temperature range.

[0007] By setting temperature sensors at the outlets of the acid tank, circulation tank and temperature control device, and the upper computer controlling the temperature control device and the delivery pump according to the detection results of each temperature sensor, the temperature of the acid liquid in the acid tank can be accurately controlled. At the same time, the acid liquid can be heated or cooled to adapt to different ambient temperature conditions. It has the advantages of being able to accurately control the temperature of the acid liquid in the acid tank, adapt to different ambient temperature conditions, and improve the pickling effect.

[0008] Preferably, the temperature regulating device comprises a heating device and a cooling device, the heating device is used to heat the acid liquid, and the cooling device is used to cool the acid liquid.

[0009] With this design, the system can flexibly adjust the acid temperature as needed. The heating device can provide heat to raise the temperature to the required level when the acid temperature is too low. The cooling device can lower the temperature when the acid temperature is too high. This two-way adjustment capability enables the system to control the acid temperature more accurately and respond quickly whether it needs to be heated up or cooled down.

[0010] Preferably, the acid tank comprises a pickling tank and an overflow tank, and an overflow hole communicating with the overflow tank is provided at the upper portion of the pickling tank; The spray device and the first temperature sensor are both arranged in the pickling tank, the inlet of the reflux pump is connected to the overflow tank, and the transportation device is used to continuously feed the steel strip into and out of the pickling tank.

[0011] The acid tank is divided into two parts: the pickling tank and the overflow tank. This design helps to realize the circulation and temperature control of the acid. The overflow hole set on the upper part of the pickling tank is connected to the overflow tank, which can maintain a stable liquid level of the acid in the pickling tank. The excess acid will flow into the overflow tank through the overflow hole, so that the volume of the acid in the pickling tank is always kept constant, which is conducive to simplifying the subsequent calculation process of determining the power of the temperature control device. The spray device and the first temperature sensor are set in the pickling tank, which can directly pickle the steel strip and monitor the acid temperature during the pickling process in real time. The inlet of the reflux pump is connected to the overflow tank, and the acid in the overflow tank can be pumped out to realize the recycling of the acid. The transportation device ensures that the steel strip can pass through the pickling tank continuously, ensuring the continuity and efficiency of the pickling process.

[0012] Preferably, a plurality of the first temperature sensors are provided, and the plurality of the first temperature sensors are distributed at different positions of the acid tank.

[0013] Preferably, a plurality of the second temperature sensors are provided, and the plurality of the second temperature sensors are distributed at different positions of the circulation tank.

[0014] In a second aspect, the present application provides a control method, which is applied to the host computer of the above-mentioned oriented silicon steel normalizing pickling temperature control system, comprising the steps of: A1. Obtain the acid temperature in the acid tank and the acid circulation tank, respectively, as the first temperature and the second temperature; A2. Determine the target delivery flow rate of the delivery pump, the target third temperature at the outlet of the temperature control device, and the target power of the temperature control device according to the first temperature, the second temperature, the preset target temperature, and the preset process setting temperature range; A3. adjusting the power of the delivery pump according to the target delivery flow rate, and adjusting the operating power of the temperature control device according to the target power; A4. Obtain the acid liquid temperature at the outlet of the temperature regulating device in real time, record it as the third temperature, and compare the third temperature with the target third temperature to correct the operating power of the temperature regulating device.

[0015] Preferably, step A2 comprises: A201. Calculate the deviation between the target temperature and the first temperature, recorded as the first temperature difference; A202. Determine the target delivery flow rate according to the first temperature difference; A203. Determine the target third temperature according to the first temperature difference, the target delivery flow rate, the first temperature and the process set temperature range; A204. Determine the target power according to the target third temperature, the target delivery flow rate and the second temperature.

[0016] Preferably, step A202 includes: According to the preset temperature difference range segment that the first temperature difference falls into, a reference delivery flow rate corresponding to the preset temperature difference range segment is extracted as the target delivery flow rate.

[0017] Preferably, step A203 includes: According to the first temperature difference, the target delivery flow rate, the first temperature and the process setting temperature range, based on a preset equivalent temperature adjustment time formula, the target third temperature is determined with the minimum equivalent temperature adjustment time as the principle.

[0018] Preferably, step A204 includes: Obtain the reference specific heat capacity of the acid solution according to the usage time of the acid solution; The target power is calculated according to the target third temperature, the target delivery flow rate, the second temperature and the reference specific heat capacity.

[0019] Beneficial effects: The oriented silicon steel normalizing pickling temperature control system and control method provided in the present application include an acid tank, a transportation device, a spraying device, a circulation tank, a reflux pump, a delivery pump, a temperature control device and a host computer. By arranging temperature sensors at the outlets of the acid tank, the circulation tank and the temperature control device, and the host computer controls the temperature control device and the delivery pump according to the detection results of each temperature sensor, the temperature of the acid liquid in the acid tank is accurately controlled, and it can adapt to different ambient temperature conditions. It has the advantages of being able to accurately control the temperature of the acid liquid in the acid tank, adapt to different ambient temperature conditions, and improve the pickling effect and production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the structure of the normalizing pickling temperature control system for oriented silicon steel provided in an embodiment of the present application.

[0021] Figure 2 A flow chart of a control method provided in an embodiment of the present application.

[0022] Explanation of reference numerals: 1. Acid tank; 101. Pickling tank; 102. Overflow tank; 103. Overflow hole; 2. Transport device; 201. Conveying roller group; 202. Guide roller; 3. Spraying device; 4. Circulation tank; 5. Reflux pump; 6. Conveying pump; 7. Temperature control device; 8. Host computer; 9. First temperature sensor; 10. Second temperature sensor; 11. Third temperature sensor; 90. Steel belt. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all of the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the application claimed for protection, but merely represents the selected embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without making creative work belong to the scope of protection of the present application.

[0024] It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings. At the same time, in the description of this application, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0025] Please refer to Figure 1 , is a temperature control system for normalizing pickling of oriented silicon steel in some embodiments of the present application, comprising: The acid tank 1 is used to store acid solution, and at least one first temperature sensor 9 is provided in the acid tank 1 to detect the temperature of the acid solution; A transport device 2, used for continuously feeding the steel strip 90 into and out of the acid tank 1; The spraying device 3 is arranged in the acid tank 1 and is used to spray acid liquid on both sides of the steel strip 90; A circulation tank 4 is used to store the acid solution refluxed from the acid tank 1. At least one second temperature sensor 10 is provided in the circulation tank 4 to detect the temperature of the acid solution. A reflux pump 5 is used to transport the acid solution in the acid tank 1 to the circulation tank 4; A delivery pump 6 is used to deliver the acid solution in the circulation tank 4 to the spraying device 3; The temperature regulating device 7 is arranged between the delivery pump 6 and the spraying device 3, and can adjust the temperature of the acid solution upward and downward. A third temperature sensor 11 is arranged at the outlet of the temperature regulating device 7 to detect the temperature of the acid solution; The host computer 8 is electrically connected to the first temperature sensor 9, the second temperature sensor 10, the third temperature sensor 11, the reflux pump 5, the delivery pump 6 and the temperature control device 7, and is used to control the temperature control device 7 and the delivery pump 6 according to the detection results of each temperature sensor, so that the temperature of the acid solution in the acid tank 1 is stabilized at the target temperature, and the temperature of the acid solution at the outlet of the temperature control device 7 does not exceed the process set temperature range.

[0026] By arranging temperature sensors at the outlets of the acid tank 1, the circulation tank 4 and the temperature regulating device 7, and controlling the temperature regulating device 7 and the delivery pump 6 by the upper computer 8 according to the detection results of each temperature sensor, the temperature of the acid solution in the acid tank 1 can be accurately controlled, and the acid solution can be heated or cooled to adapt to different ambient temperature conditions. The system has the advantages of being able to accurately control the temperature of the acid solution in the acid tank 1, adapt to different ambient temperature conditions, and improve the pickling effect.

[0027] The transport device 2 may be a conveying system composed of a series of rollers, and the speed may be adjusted to meet different pickling requirements. Figure 1 In the figure, the transport device 2 includes a plurality of conveying roller groups 201 and a plurality of guide rollers 202, wherein each conveying roller group 201 includes a driving roller and a driven roller, and the steel belt 90 passes between the driving roller and the driven roller and abuts against the driving roller and the driven roller.

[0028] The spray device 3 may include a plurality of nozzles, and the number and arrangement of the nozzles may be optimized according to the width of the steel strip 90 and the pickling requirements.

[0029] The flow rates of the reflux pump 5 and the delivery pump 6 are adjustable to meet different generation requirements.

[0030] Among them, the host computer 8 is the control center of the entire system (the host computer 8 can be an industrial-grade computer and installed with specially developed control software), which is electrically connected to all temperature sensors, pumps and temperature control devices 7. The host computer 8 can use a PID control algorithm to control the temperature control device 7 and the delivery pump 6 in real time according to the detection results of each temperature sensor. The control cycle can be set according to actual needs, for example, between 1 second and 5 seconds, to ensure that the system can respond quickly to temperature changes. The control process of the host computer 8 on the temperature control device 7 and the delivery pump 6 can refer to the control method below.

[0031] The temperature regulating device 7 includes a heating device and a cooling device, the heating device is used to heat the acid liquid, and the cooling device is used to cool the acid liquid.

[0032] Through this design, the system can flexibly adjust the acid solution temperature as needed. The heating device can provide heat when the acid solution temperature is too low, and the temperature is raised to the required level. The cooling device can reduce the temperature when the acid solution temperature is too high. This two-way adjustment capability enables the system to control the acid solution temperature more accurately, and can respond quickly whether it needs to be heated up or cooled down. In combination with the host computer 8, the working state and intensity of the heating device and the cooling device can be intelligently controlled according to the real-time feedback of each temperature sensor. In this way, not only can the acid solution temperature in the acid tank 1 be stabilized at the target temperature, but also the acid solution temperature at the outlet of the temperature regulating device 7 can be ensured not to exceed the temperature range set by the process. This design improves the accuracy and flexibility of temperature control, can better meet the strict requirements of the normalized pickling process of oriented silicon steel for temperature control, and helps to improve product quality and production efficiency. At the same time, by accurately controlling the temperature, it is also possible to reduce energy consumption and improve the economy of the system.

[0033] Specifically, the heating device can be implemented in a variety of ways, such as an electric heater, a steam heater or a hot oil heater. The electric heater can generate heat through a resistance wire, the steam heater uses high-temperature steam for heat exchange, and the hot oil heater uses high-temperature oil circulation to transfer heat. There are also many options for cooling devices, such as a water cooling system, an air cooling system or a refrigeration unit. The water cooling system uses cooling water to absorb heat, the air cooling system dissipates heat through air convection, and the refrigeration unit can provide a stronger cooling capacity.

[0034] The heating device and cooling device can be installed in series or in parallel in the acid flow path. When installed in series, the acid passes through the heating and cooling devices in sequence, which can achieve fine temperature regulation; parallel installation allows the acid to selectively pass through the heating or cooling device as needed, which improves the flexibility of the system. The capacity and power of the two devices should be matched according to the actual process requirements to ensure that various temperature regulation requirements can be met.

[0035] In some embodiments, the acid tank 1 only has a pickling tank 101 , and the inlet of the reflux pump 5 is connected to the pickling tank 101 .

[0036] In a more preferred embodiment, see Figure 1 The acid tank 1 includes a pickling tank 101 and an overflow tank 102. The upper portion of the pickling tank 101 is provided with an overflow hole 103 connected to the overflow tank 102; The spray device 3 and the first temperature sensor 9 are both arranged in the pickling tank 101 , the inlet of the reflux pump 5 is connected to the overflow tank 102 , and the transport device 2 is used to continuously feed the steel strip 90 into and out of the pickling tank 101 .

[0037] The acid tank 1 is divided into two parts, the pickling tank 101 and the overflow tank 102. This design helps to realize the circulation and temperature control of the acid solution. The overflow hole 103 arranged on the upper part of the pickling tank 101 is connected to the overflow tank 102, which can maintain the stable liquid level of the acid solution in the pickling tank 101. The excess acid solution will flow into the overflow tank 102 through the overflow hole 103, so that the volume of the acid solution in the pickling tank 101 is always kept constant, which is conducive to simplifying the subsequent calculation process of determining the power of the temperature control device 7. The spray device 3 and the first temperature sensor 9 are arranged in the pickling tank 101, which can directly pickle the steel strip 90 and monitor the acid solution temperature during the pickling process in real time. The inlet of the reflux pump 5 is connected to the overflow tank 102, and the acid solution in the overflow tank 102 can be extracted to realize the recycling of the acid solution. The transport device 2 ensures that the steel strip 90 can continuously pass through the pickling tank 101 to ensure the continuity and efficiency of the pickling process.

[0038] Therefore, the host computer 8 controls the temperature regulating device 7 and the delivery pump 6 to stabilize the temperature of the acid solution in the acid tank 1 at the target temperature, that is, to stabilize the temperature of the acid solution in the pickling tank 101 at the target temperature.

[0039] In the present application, the design of the pickling tank 101 and the overflow tank 102 can be implemented in a variety of ways. For example, the pickling tank 101 can be a rectangular tank body, and the overflow tank 102 can be set on one side or both sides of the pickling tank 101. The overflow hole 103 can be a single large hole, or a plurality of small holes evenly distributed on the upper part of the pickling tank 101. The height of the overflow hole 103 can be adjusted according to actual needs to ensure that a sufficient amount of acid is used for pickling.

[0040] There may be one or more first temperature sensors 9 , preferably multiple first temperature sensors 9 , which are distributed at different positions of the acid tank 1 (specifically, in the pickling tank 101 ).

[0041] By arranging a plurality of first temperature sensors 9 at different positions of the acid tank 1, the temperature distribution in various places in the acid tank 1 can be more comprehensively monitored. This arrangement can capture the temperature gradient or local temperature difference that may exist in the acid tank 1, thereby providing more detailed and accurate temperature data. Multi-point temperature monitoring helps the host computer 8 to more accurately understand the temperature distribution in the acid tank 1, and then to more specifically adjust the working parameters of the temperature regulating device 7 and the delivery pump 6. This design can ensure that the temperature of each area during the pickling process can be effectively controlled, avoid local overheating or uneven temperature, and thus improve the consistency and stability of the pickling quality.

[0042] In specific implementation, a plurality of first temperature sensors 9 can adopt different arrangements.For example, can be evenly distributed on the length direction of acid tank 1, to monitor the temperature variation of acid solution along steel strip 90 directions of motion.A plurality of sensors can also be set on the width direction of acid tank 1, to detect the temperature difference of different regions.In addition, sensor can also be set at the different depths of acid tank 1, to understand the temperature stratification situation of vertical direction.

[0043] These first temperature sensors 9 can be different types such as thermocouples, thermistors or optical fiber temperature sensors, and the appropriate sensor type is selected according to the specific application scenario. The number of sensors can be determined according to the size of the acid tank 1 and the temperature control accuracy requirements, and can usually be set to 3 to 10.

[0044] Likewise, one or more second temperature sensors 10 may be provided. Preferably, multiple second temperature sensors 10 are provided, and the multiple second temperature sensors 10 are distributed at different positions of the circulation tank 4 .

[0045] By arranging a plurality of second temperature sensors 10 at different positions of the circulation tank 4, the temperature distribution of the acid solution in the circulation tank 4 can be more comprehensively monitored. This arrangement helps to obtain more accurate temperature data, because the temperature of the acid solution in the circulation tank 4 may be different at different positions. By arranging a plurality of temperature sensors at different positions of the circulation tank 4, the system can obtain more comprehensive and accurate temperature information. This design helps the host computer 8 to more accurately control the temperature regulating device 7 and the delivery pump 6, thereby better maintaining the stability of the acid solution temperature in the acid tank 1. Multi-point temperature detection can reduce the error that may be caused by single-point measurement, and improve the reliability and accuracy of the entire temperature control system.

[0046] In specific implementation, the second temperature sensor 10 can be arranged in a variety of ways. For example, a temperature sensor can be set at the top, middle and bottom of the circulation tank 4 to monitor the acid temperature at different heights. Another arrangement is to evenly distribute multiple temperature sensors along the circumference of the circulation tank 4, such as setting a sensor around each of the four sides of the circulation tank. It is also possible to adopt a more complex three-dimensional distribution method according to the specific shape and size of the circulation tank 4, such as arranging multiple sensors in combination at different heights and different horizontal positions. The number of temperature sensors can be determined according to the size of the circulation tank and the complexity of the temperature distribution, and usually 3 to 8 sensors can be selected.

[0047] refer to Figure 2 The present application provides a control method, which is applied to the host computer 8 of the above-mentioned oriented silicon steel normalizing pickling temperature control system, comprising the steps of: A1. Obtain the acid temperature in the acid tank 1 and the acid circulation tank 4, respectively, recorded as the first temperature and the second temperature; A2. According to the first temperature, the second temperature, the preset target temperature and the preset process setting temperature range (the target temperature and the process setting temperature range can be set according to actual needs), determine the target delivery flow rate of the delivery pump 6, the target third temperature at the outlet of the temperature control device 7 and the target power of the temperature control device 7; A3. The delivery pump 6 is power-regulated according to the target delivery flow rate, and the operating power of the thermostat 7 is adjusted according to the target power; A4. The temperature of the acid solution at the outlet of the temperature regulating device 7 is obtained in real time, recorded as the third temperature, and the third temperature is compared with the target third temperature to correct the operating power of the temperature regulating device 7.

[0048] In step A1 , the first temperature is acquired based on the first temperature sensor 9 , and the second temperature is acquired based on the second temperature sensor 10 .

[0049] When there is only one first temperature sensor 9, the detection result of the first temperature sensor 9 can be used as the first temperature. When there are multiple first temperature sensors 9, the average value or weighted average value of the detection results of each first temperature sensor 9 can be calculated (wherein the weight coefficient can be set according to the distance between each sensor and the steel strip 90, and the closer the distance, the greater the weight coefficient) as the first temperature. Among them, when there are multiple first temperature sensors 9, it is also possible to first determine whether each first temperature sensor 9 is abnormal based on the detection result of each first temperature sensor 9 (for example, when the deviation between the detection result of a first temperature sensor 9 and the average value of the detection results of each first temperature sensor 9 exceeds 3 times the standard deviation of the detection results of each first temperature sensor 9, it is determined that the corresponding first temperature sensor 9 is abnormal), and then calculate the first temperature after eliminating the detection results of the abnormal first temperature sensor 9.

[0050] When there is only one second temperature sensor 10, the detection result of the second temperature sensor 10 can be used as the second temperature. When there are multiple second temperature sensors 10, the average value of each second temperature sensor 10 can be calculated as the second temperature. When there are multiple second temperature sensors 10, it is also possible to first determine whether each second temperature sensor 10 is abnormal based on the detection result of each second temperature sensor 10 (for example, when the deviation between the detection result of a second temperature sensor 10 and the average value of the detection results of each second temperature sensor 10 exceeds 3 times the standard deviation of the detection results of each second temperature sensor 10, it is determined that the corresponding second temperature sensor 10 is abnormal), and then calculate the second temperature after eliminating the detection results of the abnormal second temperature sensor 10.

[0051] Specifically, step A2 includes: A201. Calculate the deviation between the target temperature and the first temperature, recorded as the first temperature difference; A202. Determine the target delivery flow rate according to the first temperature difference; A203. Determine the target third temperature according to the first temperature difference, the target delivery flow rate, the first temperature and the process set temperature range; A204. Determine the target power based on the target third temperature, the target delivery flow rate and the second temperature.

[0052] Among them, in step A202, the method for determining the target delivery flow rate can be selected according to the actual situation. One possible implementation method is to establish a corresponding relationship table between the first temperature difference and the flow rate, and obtain the target delivery flow rate by looking up the table according to the calculated first temperature difference. Another method is to use a mathematical model, such as a linear or nonlinear function, to calculate the most suitable delivery flow rate as the target delivery flow rate according to the first temperature difference. The importance of this step is to affect the heat transfer efficiency by adjusting the circulation speed of the acid solution, thereby accelerating the response speed of temperature regulation.

[0053] For example, in one possible implementation, step A202 includes: according to the preset temperature difference range segment into which the first temperature difference falls, extracting the reference delivery flow rate corresponding to the preset temperature difference range segment as the target delivery flow rate. Specifically, a plurality of preset temperature difference range segments are pre-set, and a corresponding reference delivery flow rate is assigned to each preset temperature difference range segment to form a lookup table, and the target delivery flow rate is obtained by looking up the table according to the calculated first temperature difference. This method can quickly select a suitable delivery flow rate according to the actual temperature deviation, thereby realizing precise adjustment of the acid liquid temperature, avoiding complex mathematical calculations, simplifying the control logic, and improving the response speed of the system.

[0054] The setting of the preset temperature difference range and the corresponding reference delivery flow rate can be determined based on historical data and process experience. For example, the preset temperature difference range includes [-5°C, -3°C), [-3°C, -1°C), [-1°C, 1°C], (1°C, 3°C] and (3°C, 5°C], and the corresponding reference delivery flow rates are 80%, 90%, 100%, 110% and 120% of the rated flow rate (the rated flow rate is determined by the performance of the delivery pump 6), but is not limited thereto.

[0055] Further, step A203 includes: According to the first temperature difference, the target delivery flow rate, the first temperature and the process setting temperature range, based on the preset equivalent temperature adjustment time formula, the target third temperature is determined with the minimum equivalent temperature adjustment time as the principle.

[0056] Among them, the equivalent temperature adjustment time formula is: (1); in, is the equivalent temperature adjustment time, is the volume of the acid solution in the pickling tank 101, is the first temperature difference, Deliver traffic to the target. is the target third temperature, , Set the temperature range for the process ( , is the target temperature), Set the lower limit of the temperature range for the process, Set the upper limit of the temperature range for the process, is the first temperature.

[0057] In fact, while the acid solution is being transported to the pickling tank 101, the acid solution in the pickling tank 101 will simultaneously overflow to the overflow tank 102. Assuming that the temperature of the acid solution in the pickling tank 101 changes from To target temperature The time required is , then: (2); The part on the left side of the equal sign in formula (2) represents the heat released by the acid solution input into the pickling tank 101, and the part on the right side of the equal sign represents the heat absorbed by the acid solution in the pickling tank 101 that has not overflowed. is the specific heat capacity of the acid, is the density of the acid.

[0058] Formula (2) can be converted to: (3); Also because , formula (3) can be converted into formula (1).

[0059] Generally, when , at this time is positive, the acid needs to be heated up so that Should be greater than ,at this time, The larger the The smaller it is, the ;when , at this time is negative, the acid needs to be cooled down, so Should be less than ,at this time, The smaller the The smaller it is, the .

[0060] Further, step A204 includes: Obtain the reference specific heat capacity of the acid solution according to the usage time of the acid solution; The target power is calculated according to the target third temperature, the target delivery flow rate, the second temperature and the reference specific heat capacity.

[0061] Considering the effect of the use time of the acid on its specific heat capacity, a more accurate reference specific heat capacity value is obtained, thereby improving the accuracy of subsequent calculations. The target power is calculated based on the target third temperature, the target delivery flow rate, the second temperature and the reference specific heat capacity. This calculation method takes into account multiple key parameters, including the desired temperature, the acid flow rate, the initial temperature and the thermodynamic properties of the acid, and can more accurately determine the power required by the temperature control device 7.

[0062] The present application provides a variety of methods for obtaining reference specific heat capacity of acid solution. One method is to establish a corresponding relationship table between the use time of acid solution and specific heat capacity, and obtain the reference specific heat capacity by looking up the table according to the actual use time. Another method is to experimentally determine the specific heat capacity of acid solution under different use time, establish a mathematical model, and calculate the reference specific heat capacity according to the use time. Online measurement equipment can also be used to monitor the change of specific heat capacity of acid solution in real time.

[0063] When the acid needs to be heated, the target power refers to the heating power, and when the acid needs to be cooled, the target power refers to the cooling power. The target power can be calculated using the following formula: ; in, is the target power, is the reference specific heat capacity.

[0064] Specifically, in step A3, the delivery flow rate of the delivery pump 6 is made equal to the target delivery flow rate by adjusting the power of the delivery pump 6. A conversion function between the delivery flow rate and the power of the delivery pump 6 can be obtained in advance by experimental fitting, which is recorded as a first conversion function. The target delivery flow rate is input into the first conversion function to calculate the corresponding power, so that the power of the delivery pump 6 is adjusted according to the calculation result.

[0065] Further, in step A3, the operating power of the temperature regulating device 7 is adjusted so that the heating power or cooling power of the temperature regulating device 7 on the acid solution is equal to the target power. Among them, the conversion function between the heating power and the operating power of the temperature regulating device 7 can be obtained in advance through experimental fitting, recorded as the second conversion function, and the conversion function between the cooling power and the operating power of the temperature regulating device 7 can be obtained in advance through experimental fitting, recorded as the third conversion function. When the acid solution needs to be heated, the target power is input into the second conversion function to calculate the corresponding operating power. When the acid solution needs to be cooled, the target power is input into the third conversion function to calculate the corresponding operating power.

[0066] Specifically, in step A4, by continuously monitoring the actual temperature (third temperature) at the outlet of the temperature regulating device 7 and comparing it with the target third temperature, the system can timely detect the temperature deviation and make adjustments. This feedback mechanism can use a PID control algorithm to dynamically adjust the operating power of the temperature regulating device 7 according to the size and change trend of the temperature deviation, thereby achieving rapid convergence and stable control of the temperature.

[0067] In this document, relational terms such as first and second, etc. are used merely to distinguish one entity or operation from another entity or operation, but do not necessarily require or imply any such actual relationship or order between these entities or operations.

[0068] The above description is only an embodiment of the present application and is not intended to limit the protection scope of the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A temperature control system for normalizing pickling of oriented silicon steel, characterized in that: include: An acid tank (1) for storing acid liquid, wherein at least one first temperature sensor (9) is arranged in the acid tank (1) for detecting the temperature of the acid liquid; A transport device (2) for continuously feeding the steel strip (90) into and out of the acid tank (1); A spraying device (3) is arranged in the acid tank (1) and is used to spray acid liquid onto both sides of the steel strip (90); A circulation tank (4) for storing the acid liquid refluxed from the acid tank (1), wherein the circulation tank (4) is provided with at least one second temperature sensor (10) for detecting the temperature of the acid liquid; A reflux pump (5), used for conveying the acid solution in the acid tank (1) to the circulation tank (4); A delivery pump (6) for delivering the acid liquid in the circulation tank (4) to the spraying device (3); a temperature regulating device (7) disposed between the delivery pump (6) and the spray device (3) and capable of regulating the temperature of the acid solution upward or downward; a third temperature sensor (11) is disposed at the outlet of the temperature regulating device (7) for detecting the temperature of the acid solution; The upper computer (8) is electrically connected to the first temperature sensor (9), the second temperature sensor (10), the third temperature sensor (11), the reflux pump (5), the delivery pump (6) and the temperature control device (7), and is used to control the temperature control device (7) and the delivery pump (6) according to the detection results of each temperature sensor, so that the temperature of the acid liquid in the acid tank (1) is stabilized at a target temperature, and the temperature of the acid liquid at the outlet of the temperature control device (7) does not exceed the process set temperature range.

2. The normalized pickling temperature control system for oriented silicon steel according to claim 1, characterized in that: The temperature regulating device (7) comprises a heating device and a cooling device, wherein the heating device is used to heat the acid liquid, and the cooling device is used to cool the acid liquid.

3. The normalized pickling temperature control system for oriented silicon steel according to claim 1, characterized in that: The acid tank (1) comprises a pickling tank (101) and an overflow tank (102); an overflow hole (103) communicating with the overflow tank (102) is provided at the upper portion of the pickling tank (101); The spray device (3) and the first temperature sensor (9) are both arranged in the pickling tank (101), the inlet of the reflux pump (5) is connected to the overflow tank (102), and the transport device (2) is used to continuously feed the steel strip (90) into and out of the pickling tank (101).

4. The normalized pickling temperature control system for oriented silicon steel according to claim 1, characterized in that: A plurality of the first temperature sensors (9) are provided, and the plurality of the first temperature sensors (9) are distributed at different positions of the acid tank (1).

5. The normalized pickling temperature control system for oriented silicon steel according to claim 1, characterized in that: A plurality of the second temperature sensors (10) are provided, and the plurality of the second temperature sensors (10) are distributed at different positions of the circulation tank (4).

6. A control method, characterized in that: The host computer (8) applied to the normalizing pickling temperature control system for oriented silicon steel according to any one of claims 1 to 5 comprises the following steps: A1. Obtaining the acid temperature in the acid tank (1) and the acid solution in the circulation tank (4), which are recorded as the first temperature and the second temperature respectively; A2. Determine the target delivery flow rate of the delivery pump (6), the target third temperature at the outlet of the temperature control device (7), and the target power of the temperature control device (7) according to the first temperature, the second temperature, the preset target temperature, and the preset process setting temperature range; A3. adjusting the power of the delivery pump (6) according to the target delivery flow rate, and adjusting the operating power of the temperature control device (7) according to the target power; A4. Acquire the temperature of the acid liquid at the outlet of the temperature regulating device (7) in real time, record it as the third temperature, and compare the third temperature with the target third temperature to correct the operating power of the temperature regulating device (7).

7. The control method according to claim 6, characterized in that: Step A2 includes: A201. Calculate the deviation between the target temperature and the first temperature, recorded as the first temperature difference; A202. Determine the target delivery flow rate according to the first temperature difference; A203. Determine the target third temperature according to the first temperature difference, the target delivery flow rate, the first temperature and the process set temperature range; A204. Determine the target power according to the target third temperature, the target delivery flow rate and the second temperature.

8. The control method according to claim 7, characterized in that: Step A202 includes: According to the preset temperature difference range segment that the first temperature difference falls into, a reference delivery flow rate corresponding to the preset temperature difference range segment is extracted as the target delivery flow rate.

9. The control method according to claim 7, characterized in that: Step A203 includes: According to the first temperature difference, the target delivery flow rate, the first temperature and the process setting temperature range, based on a preset equivalent temperature adjustment time formula, the target third temperature is determined with the minimum equivalent temperature adjustment time as the principle.

10. The control method according to claim 7, characterized in that: Step A204 includes: Obtain the reference specific heat capacity of the acid solution according to the usage time of the acid solution; The target power is calculated according to the target third temperature, the target delivery flow rate, the second temperature and the reference specific heat capacity.

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