Visual pickling apparatus and pickling simulation test method

Abstract

This invention relates to a visual pickling device, comprising a pickling tank and a particle image velocimeter. The pickling tank is equipped with a steel strip support mechanism and an acid spraying mechanism. The pickling tank is transparent, and the particle image velocimeter is arranged on the side of the pickling tank to measure the velocity of at least one local plane within the tank. The invention also relates to a method for conducting pickling simulation tests based on this visual pickling device. By using a transparent pickling tank and arranging a particle image velocimeter on the side of the tank, the flow state of the medium within the pickling tank can be acquired through the particle image velocimeter. This allows for a direct, accurate, and reliable understanding and study of the actual movement of the acid solution within the pickling tank and its influencing factors, which is beneficial for optimizing actual pickling processes and advancing technology.

Description

Technical Field

[0001] This invention relates to a visual pickling apparatus and a method for conducting pickling simulation tests based on the visual pickling apparatus. Background Technology

[0002] Pickling tanks are where steel strips undergo a chemical reaction with acid to remove surface oxides. The rate of chemical reaction between the steel strip and the acid, as well as the material transfer efficiency on the steel strip surface, are key factors affecting the pickling speed. These are mainly influenced by the operating speed of the pickling section, the concentration and temperature of the acid, and the degree of turbulence. Pickling tanks consist of a series of horizontal channels with specific geometric shapes, and the flow state of the acid is significantly affected by the internal structural characteristics of the tank. In actual production, to prevent the volatilization and escape of highly corrosive acids and acid mist, pickling tanks are generally designed as completely sealed structures, making it difficult to understand and study the actual movement of the acid within the tank and its influencing factors. Summary of the Invention

[0003] This invention relates to a visual pickling device and a pickling simulation test method based on the visual pickling device, which can at least solve some of the defects of the prior art.

[0004] This invention relates to a visual pickling device, comprising a pickling tank and a particle image velocimeter. The pickling tank is equipped with a strip steel support mechanism and an acid spraying mechanism. The pickling tank is a transparent tank. The particle image velocimeter is arranged on the side of the pickling tank and is used to measure the velocity of at least one local plane within the pickling tank.

[0005] As one implementation method, the acid spraying mechanism includes a main spraying unit, a side spraying unit, a bottom spraying unit, and a top spraying unit.

[0006] As one implementation method, the flow rate, installation position, and spray angle of the main spray unit, the side spray unit, the bottom spray unit, and the top spray unit are all adjustable.

[0007] As one embodiment, the strip support mechanism includes two sets of support rollers respectively disposed at the inlet and outlet of the pickling tank, and an immersion roller disposed in the middle of the pickling tank. The rotation speed of the support rollers and the immersion rollers is adjustable.

[0008] As one embodiment, the strip support mechanism includes multiple andesite blocks, each of which is arranged sequentially at the bottom of the trough along the running direction of the strip; the andesite blocks are detachably installed at the bottom of the trough and their installation positions are adjustable.

[0009] As one embodiment, the pickling tank is also provided with at least one baffle roller, and each baffle roller is arranged sequentially on the top of the tank along the running direction of the strip steel; the baffle roller is detachably installed on the top of the tank and the distance between it and the steel wire is adjustable.

[0010] This invention also relates to a method for simulating acid pickling tests, implemented based on the aforementioned visual acid pickling device.

[0011] The method includes:

[0012] The strip is passed through an acid pickling tank, and image information of the target plane is acquired by the particle image velocimeter. The image information is processed to obtain the flow state at the target plane.

[0013] As one embodiment, the acid spraying mechanism includes a main spraying unit, a side spraying unit, a bottom spraying unit, and a top spraying unit. One or more of the acid spraying units are activated, and the nozzle parameters in the activated acid spraying units are adjusted to study the influence of a single acid spraying unit on the flow field inside the tank and / or the coupling influence of multiple acid spraying units on the flow field inside the tank. The nozzle parameters include at least one of the following: number of nozzles, position, flow rate, and spray angle.

[0014] As one implementation method, the strip parameters are adjusted to study the influence of strip operation on the flow field inside the tank. The strip parameters include at least one of strip size, strip operating speed and strip sag.

[0015] As one implementation method, the parameters of the strip support mechanism are adjusted to study the influence of the strip support mechanism on the flow field inside the tank.

[0016] The present invention has at least the following beneficial effects:

[0017] This invention employs a transparent pickling tank and arranges a particle image velocimeter on the side of the pickling tank. The particle image velocimeter can collect the flow state of the medium in the pickling tank, enabling intuitive, accurate, and reliable understanding and research of the actual movement of the acid solution in the pickling tank and its influencing factors. This is beneficial for the optimization of the actual pickling process and technological advancement. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 A schematic diagram of the structure of the visual pickling device provided in Embodiment 1 of the present invention (top of the tank not shown);

[0020] Figure 2 This is a schematic diagram of the neural network model provided in Embodiment 2 of the present invention;

[0021] Figure 3 This is a schematic diagram illustrating the adjustment and update of the weighting coefficients of the neural network model provided in Embodiment 2 of the present invention;

[0022] Figure 4 This is a schematic diagram of the pickling device with an inducer provided in Embodiment 3 of the present invention;

[0023] Figure 5 This is a schematic diagram of the inducer provided in Embodiment 3 of the present invention. Detailed Implementation

[0024] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0025] Example 1

[0026] like Figure 1 This invention provides a visual pickling device, including a pickling tank 1 and a particle image velocimeter. The pickling tank 1 is equipped with a strip steel support mechanism and an acid spraying mechanism. The pickling tank 1 is a transparent tank body 11. The particle image velocimeter is arranged on the side of the pickling tank 1 and is used to measure the velocity of at least one local plane within the pickling tank 1.

[0027] Preferably, based on the principle of geometric similarity, the pickling tank 1 in this embodiment is obtained by scaling down its geometric dimensions according to the original structural features of the pickling tank 1 used in actual production, which facilitates experimental research. For ease of description, in comparison, the pickling tank 1 used in actual production is defined as the prototype pickling tank 1, and the pickling tank 1 in this embodiment is defined as the model pickling tank 1, that is: λ l =l m / l p In the formula, λ l For length scale, l m Let l be the length of a certain part of the pickling tank 1 in the model. p The length of the corresponding part of the prototype pickling tank 1.

[0028] Based on the principle of motion similarity, the velocity fields of the flow inside the prototype pickling tank 1 and the model pickling tank 1 are similar. All corresponding velocities in the two flow fields have the same direction and their magnitudes maintain a fixed proportional relationship, namely: λ u =v m / v p =λ l / λ t In the formula, λ u For velocity scale, v mIt is the characteristic velocity, v, in the model. p It is the characteristic velocity in the prototype, λ l For length scale, λ t For time scale.

[0029] The pickling tank 1 mentioned above is not limited to being made of plexiglass; preferably it is made of acid-resistant material, such as acid-resistant plexiglass.

[0030] In one embodiment, the acid spraying mechanism includes a main spraying unit, a side spraying unit, a bottom spraying unit, and a top spraying unit. The main spraying unit is arranged on the inlet side beam and the outlet side beam of the pickling tank 1, respectively. The side spraying unit is arranged on the side wall of the pickling tank 1. The bottom spraying unit is arranged at the bottom of the pickling tank 1. The top spraying unit is arranged on the top beam of the pickling tank 1.

[0031] In this embodiment, unlike the actual acid nozzle arrangement, the main spray unit, side spray unit, bottom spray unit and top spray unit are arranged simultaneously in the pickling tank 1, which can comprehensively, reliably and accurately grasp the influence of various acid nozzle arrangements on the flow field in the tank.

[0032] Furthermore, the flow rate, installation position, and spray angle of the main spray unit, the side spray unit, the bottom spray unit, and the top spray unit are all adjustable, which makes the test more flexible and can simulate various acid spray conditions.

[0033] In one embodiment, the main spray unit includes an inlet-side main spray and an outlet-side main spray; a single main spray has multiple nozzles to ensure coverage of the required spray width.

[0034] The side spray unit preferably includes two sets of side sprays, which are respectively arranged on the two side walls of the pickling tank 1. Each set of side sprays includes 3 to 8 side nozzles. In one embodiment, the length of the pickling tank 1 is 2104 mm. Each set of side sprays includes 5 side nozzles. Taking the midpoint of the length of the pickling tank 1 as the origin, the coordinates of the central axes of the side nozzles in one set of side sprays are X = -860 mm, X = -455 mm, X = -80 mm, X = 252.4 mm, and X = 657.5 mm, respectively. The side nozzles in the other set of side sprays are arranged in a centrally symmetrical manner, that is, one side nozzle is located at the origin, and the other four side nozzles are arranged centrally symmetrically with respect to the origin. The above-mentioned side spray arrangement can flexibly and reliably simulate the side spray working conditions. For pickling tanks 1 of other lengths, the arrangement of the side nozzles can refer to the above-mentioned side spray arrangement method, and the number of side nozzles can be increased or decreased accordingly.

[0035] The bottom spray unit includes multiple bottom nozzles, which are arranged sequentially along the length of the pickling tank 1. In one embodiment, the pickling tank 1 is 2104 mm long, and there are four bottom nozzles. Taking the midpoint of the pickling tank 1 as the origin, the coordinates of the central axis of each bottom nozzle are X = -699.4 mm, X = -349.7 mm, X = 349.7 mm, and X = 699.4 mm, respectively. For pickling tanks 1 of other lengths, the arrangement of the bottom nozzles can refer to the above bottom spray arrangement method, and the number of bottom nozzles can be increased or decreased accordingly.

[0036] The top spray unit includes multiple top nozzles, which are arranged sequentially along the length of the pickling tank 1. In one embodiment, the pickling tank 1 is 2104 mm long, and there are four top nozzles. Taking the midpoint of the pickling tank 1 as the origin, the coordinates of the central axis of each top nozzle are X = -540 mm, X = -170 mm, X = 170 mm, and X = 540 mm, respectively. For pickling tanks 1 of other lengths, the arrangement of the top nozzles can refer to the above top spray arrangement, and the number of top and bottom nozzles can be increased or decreased accordingly.

[0037] In one embodiment, the strip support mechanism includes two sets of support rollers 12 respectively disposed at the inlet and outlet of the pickling tank 1, and an immersion roller 13 disposed in the middle of the pickling tank 1. The rotational speeds of the support rollers 12 and the immersion roller 13 are adjustable. The support rollers 12 are used to contact the lower surface of the strip, and the immersion roller 13 is used to contact the upper surface of the strip to ensure the tension of the strip within the tank. The adjustable rotational speeds of the support rollers 12 and the immersion roller 13 facilitate control of the strip's running speed.

[0038] In one embodiment, the strip support mechanism includes multiple andesite blocks, each of which is arranged sequentially at the bottom of the tank along the strip's running direction. The andesite blocks are detachably installed at the bottom of the tank and their positions are adjustable. Specifically, multiple threaded holes can be opened at the bottom of the pickling tank 1, and screws can be threaded into these holes. The andesite blocks are then installed inside the grooves of the screws.

[0039] In one embodiment, the pickling tank 1 is further provided with at least one baffle roller, and each baffle roller is arranged sequentially on the top of the tank along the running direction of the strip; the baffle roller is detachably installed on the top of the tank and the distance between it and the passing wire is adjustable. Multiple threaded holes can be opened on the top of the pickling tank 1, and screws can be screwed into the threaded holes. The baffle roller is then installed inside the groove of the screw.

[0040] In one embodiment, overflow weirs are provided on the inlet and outlet sides of the pickling tank 1, respectively. The height of the overflow weirs is adjustable, thereby making the overflow height of the pickling tank 1 adjustable.

[0041] Example 2

[0042] This invention provides a method for simulating pickling tests, implemented based on the visual pickling apparatus provided in Embodiment 1 above.

[0043] The method includes:

[0044] The strip is passed through the pickling tank 1, and image information of the target plane is collected by the particle image velocimeter. The image information is processed to obtain the flow state at the target plane.

[0045] In the above methods, plastic conveyor belts or similar materials can be used to simulate actual steel strips, which is convenient to operate; alternatively, steel strips of corresponding sizes can be used for simulation tests, which can better reflect the actual operating conditions of steel strips, and the test results are more accurate and reliable.

[0046] The pickling tank 1 can use tap water, industrial water, or other simulated acid solutions, which are convenient to operate and have low costs; however, it is preferable to use the acid solution actually used in production, as it can better reflect the actual pickling conditions and the test results are more accurate and reliable.

[0047] In one embodiment, strip parameters are adjusted to study the effect of strip operation on the flow field in the tank. The strip parameters include at least one of strip size, strip operating speed, and strip sag.

[0048] In one embodiment, for an acid spraying mechanism comprising a main spraying unit, a side spraying unit, a bottom spraying unit, and a top spraying unit, the above-mentioned test method further includes:

[0049] One or more acid spraying units are turned on, and the nozzle parameters in the turned-on acid spraying units are adjusted to study the influence of a single acid spraying unit on the flow field in the tank and / or the coupling influence of multiple acid spraying units on the flow field in the tank; wherein, the nozzle parameters include at least one of the following: number of nozzles, position, flow rate and spray angle.

[0050] In one embodiment, the parameters of the strip support mechanism are adjusted to study its impact on the flow field within the tank. The parameters of the strip support mechanism include at least one of the following:

[0051] (1) Adjust the diameter of the support roller 12 and / or the immersion roller 13;

[0052] (2) Adjust the quantity, structure, placement position, and placement angle of the andesite blocks.

[0053] In addition, by adjusting the number and / or diameter of the immersion rollers 13 and / or the baffle rollers, the influence of the rollers in the trough on the flow field in the trough can be studied.

[0054] As can be seen, this embodiment incorporates a variety of adjustment methods, making most / all of the process parameters of the pickling tank 1 adjustable. This allows for the study and understanding of the influence of each process parameter on the flow state of the medium inside the pickling tank 1, thereby obtaining the influencing factors of pickling production, helping to reveal the flow mechanism inside the pickling tank 1, and proposing a reasonable pickling process.

[0055] In one embodiment, the above-described test method further includes:

[0056] During the experiment, the pickling quality of the strip steel at the outlet side of pickling tank 1 was collected to obtain the current pickling process parameter set. This allows for the construction of a relational database between the pickling process parameter set and the pickling quality of the strip steel. Based on this relational database, the actual pickling process can be optimized.

[0057] An image acquisition module (e.g., a camera) is installed at the outlet side of pickling tank 1 to acquire images of the strip surface. The image data of the strip is acquired by the image data acquisition module and visualized by the visualization module. Then, the pickling quality of the strip is evaluated and scored by the pickling quality quantitative evaluation module.

[0058] In one embodiment, the pickling quality quantitative evaluation module feeds back the acquired pickling quality to the PLC. The PLC receives the pickling quality fed back by the pickling quality quantitative evaluation module and calculates the corresponding pickling process parameter set accordingly. Based on the pickling quality fed back by the pickling quality quantitative evaluation module and the preset pickling quality, the PC adjusts the pickling process parameter set calculated by the PLC through a neural network model to formulate a new pickling process.

[0059] In one embodiment, such as Figure 2 The training samples for the neural network model are collected from the PLC, including r(k), y(k), and K. p K I and K D Where r(k) is the preset pickling quality in the k-th iteration, y(k) is the pickling quality fed back by the pickling quality quantitative evaluation module in the k-th iteration, and K p K I K D These are the adjustable parameters of the P, I, and D of the PLC's PID controller.

[0060] In another embodiment, the PC communicates with the OPC Server via an OPC Client, and the OPC Server communicates with the PLC to collect training samples. After acquiring the samples, they are stored in the PC's database for training the neural network model.

[0061] Furthermore, the neural network model is trained using the backpropagation (BP) algorithm, where the performance metric function is:

[0062]

[0063] Where r(k) is the preset pickling quality in the k-th iteration, and y(k) is the pickling quality fed back by the pickling quality quantitative evaluation module in the k-th iteration.

[0064] Preferably, the neural network model has 2 neurons in the input layer, 6 neurons in the hidden layer, and 3 neurons in the output layer.

[0065] Preferably, the number of neurons in the hidden layer of the neural network model can be adjusted according to actual needs, and the connection relationship between each neuron corresponds to different and continuously adjustable weighting coefficients.

[0066] On one hand, the activation function of the hidden layer is:

[0067]

[0068] Other activation functions can also be used in the hidden layer.

[0069] On the other hand, the activation function of the output layer is:

[0070]

[0071] The output layer can also use other activation functions.

[0072] In one embodiment, gradient descent is used to adjust and update the weighting coefficients of the neural network model.

[0073] Furthermore, such as Figure 3 The step of adjusting and updating the weighting coefficients of the neural network model using gradient descent specifically includes:

[0074] S1. Initialize the initial values ​​of the weighting coefficients of each layer of the neural network model, and set the number of iterations of the neural network model to k = 1;

[0075] S2. Calculate the error between the input value and the output value of the input layer. If the error is less than a first threshold, then execute S3; otherwise, optimize the input value and the output value of the input layer to make the error less than the first threshold.

[0076] S3. Calculate the input and output of each layer of neurons in the neural network model, wherein the output value of the output layer of the neural network model is an adjustable parameter of the PID controller of the PLC;

[0077] S4. The output value of the PID controller is calculated based on the adjustable parameters of the PID controller of the PLC;

[0078] S5. Perform neural network model learning and adjust the weighting coefficients so that the adjustable parameters of the PID controller can be adaptively adjusted;

[0079] S6. If the adjustable parameter of the PID controller is greater than the second threshold, the neural network model training is complete; otherwise, set the number of iterations of the neural network model to k = k + 1 and return to S2.

[0080] The sampling period is set to 1 second, meaning the steel strip pickling system calls the neural network model every second. Once the neural network model is trained, it can effectively control the acid quality. When encountering disturbances or parameter changes, it can quickly readjust the parameter values ​​to achieve better control.

[0081] Example 3

[0082] This embodiment further optimizes the above-described Embodiment 1 / Embodiment 2.

[0083] like Figure 4 At least one inducer 2 is provided on the pickling tank 1. The inducer 2 has an air inlet, an air supply outlet and an air return outlet. The air inlet is connected to an air supply pipe 21. The air supply outlet and the air return outlet are both connected to the tank cavity of the pickling tank 1. At least part of the air return outlet of the inducer 2 is set to correspond to the hydrogen enrichment zone of the pickling tank 1.

[0084] Preferably, the inducer 2 is arranged at the top of the pickling tank 1.

[0085] The inducers 2 are preferably arranged in multiples, which can improve the control effect and efficiency of hydrogen concentration in the tank. Preferably, at least some of the inducers 2 are arranged in the hydrogen enrichment area of ​​the pickling tank 1, for example, by opening at the top of the hydrogen enrichment area and connecting to the return air inlet of the inducer 2, or by connecting through a return air pipe.

[0086] In this embodiment, by setting an inducer 2, the gas in the pickling tank 1 is extracted and then sent back into the tank. On the one hand, this can change the gas distribution in the tank, improve the gas flow in the tank, and prevent hydrogen enrichment. On the other hand, it can also dilute the atmosphere in the tank, thereby reducing the possibility of hydrogen combustion and explosion in the tank and effectively improving the safety of the experiment.

[0087] In one embodiment, the gas supply pipe 21 supplies an inert gas to dilute the atmosphere in the tank while preventing hydrogen explosion. The inert gas includes, but is not limited to, nitrogen.

[0088] In one embodiment, the air jet output from the air outlet takes at least one of the following forms:

[0089] (1) The air jet is directed toward the hydrogen enrichment area to drive the hydrogen in the tank to other areas of the pickling tank 1, which can increase the flow of hydrogen and make it easier for hydrogen to be discharged from the tank.

[0090] (2) The air jet is directed toward the area around the hydrogen enrichment zone to create a negative pressure suction effect on the hydrogen enrichment zone. The negative pressure effect generated by the jet can draw hydrogen from the hydrogen enrichment zone and increase the fluidity of hydrogen.

[0091] In one embodiment, such as Figure 5 A first adsorbent layer 24 is provided in the return air channel 22 of the inducer 2. Preferably, the first adsorbent layer 24 is mainly used to absorb acid mist in the return air. For example, the first adsorbent layer 24 is made of SDG adsorbent or activated carbon adsorbent.

[0092] Among them, the return air inlet / return air channel 22 in the inducer 2 can be multiple, which can increase the processing capacity.

[0093] In one embodiment, such as Figure 5 A second adsorbent layer 25 is also provided in the return air channel 22 of the inducer 2. The second adsorbent layer 25 is located downstream of the first adsorbent layer 24, that is, the second adsorbent layer 25 is located on the side of the first adsorbent layer 24 away from the return air inlet. The return air is processed sequentially through the first adsorbent layer 24 and the second adsorbent layer 25.

[0094] In one embodiment, the second adsorbent layer 25 uses an adsorbent capable of adsorbing hydrogen, including but not limited to activated carbon with a high specific surface area or carbon nanotubes.

[0095] Based on the above scheme, hydrogen adsorption can be achieved in the inducer 2. The hydrogen concentration in the air jet is low, which can effectively reduce the hydrogen concentration in the tank and achieve significant hydrogen control. The return air first passes through the first adsorbent layer 24 to adsorb acid mist, and then enters the second adsorbent layer 25 for hydrogen adsorption treatment. The process is highly reasonable, which can ensure the hydrogen adsorption effect and reduce the load on the second adsorbent layer 25.

[0096] In this embodiment, based on the hydrogen removal function of the inducer 2, the hydrogen control requirements during the test can be well met, ensuring the safety of personnel and equipment during the test; there is no need to set up additional mist extraction equipment and acid mist purification equipment, which can effectively reduce the test cost. Moreover, the inducer 2 has the characteristics of small size and easy disassembly and assembly, and can be well applied to the pickling tank 1 used for the test.

[0097] In one embodiment, such as Figure 5A third adsorbent layer 26 is provided in the air supply channel 23 of the inducer 2. Preferably, the third adsorbent layer 26 is an adsorbent capable of adsorbing hydrogen, including but not limited to high specific surface area activated carbon or carbon nanotubes. Hydrogen adsorption can also be achieved through this third adsorbent layer 26. In particular, when the inducer 2 is simultaneously provided with a second adsorbent layer 25 and a third adsorbent layer 26, the hydrogen adsorption effect can be further improved.

[0098] In one embodiment, such as Figure 5 The aforementioned inducer 2 includes a static pressure box 27 and an induction box 28. The aforementioned air supply pipe 21 is connected to the static pressure box 27. The outlet side of the static pressure box 27 is provided with an air inlet nozzle, which faces into the induction box 28, for inputting an air jet into the induction box 28 to form a negative pressure. Both the return air port and the supply air port are provided on the induction box 28; the outlet side of the induction box 28 is provided with an air supply nozzle, which faces into the pickling tank 1, for inputting a supply air jet into the pickling tank 1.

[0099] Preferably, the spray angle of the air supply nozzle is adjustable, which can improve process flexibility.

[0100] To ensure the stability of the air pressure in the pickling tank 1, the air supply pipe of the inducer 2 can be connected to two branch pipes. One branch pipe is an air supply branch pipe connected to the pickling tank 1, and the aforementioned air supply nozzle can be set at the outlet end of the air supply branch pipe. The other branch pipe is an exhaust branch pipe. Since the gas discharged from the air supply pipe is all purified gas, it will not cause secondary pollution to the atmosphere.

[0101] In one embodiment, the pickling tank 1 is equipped with a hydrogen concentration detection unit for detecting the hydrogen concentration within the tank. An induction control valve 211 is installed on the gas supply pipe 21, and the hydrogen concentration detection unit is preferably interlocked with this induction control valve 211 to facilitate automatic hydrogen control. During testing, the hydrogen concentration within the pickling tank 1 is detected. When the hydrogen concentration reaches a set threshold, the inducer 2 activates to reduce the hydrogen concentration within the tank.

[0102] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A visualizing pickling apparatus characterized by: The acid pickling tank is provided with a strip steel supporting mechanism and an acid spraying mechanism, the acid pickling tank adopts a transparent tank body, and the particle image velocimetry is arranged on the side of the acid pickling tank and used for completing speed measurement of at least one local plane in the acid pickling tank. The acid spraying mechanism comprises a main spraying unit, a side spraying unit, a bottom spraying unit and a top spraying unit. The flow, installation position and spraying angle of the main spraying unit, the side spraying unit, the bottom spraying unit and the top spraying unit are adjustable. The acid spraying mechanism is used for opening one or more groups of acid spraying units during simulation test, adjusting nozzle parameters of the opened acid spraying units, and researching influences of a single group of acid spraying units on a flow field in the tank and / or coupling influences of multiple groups of acid spraying units on the flow field in the tank. The main spraying unit is arranged on the inlet side crossbeam and the outlet side crossbeam of the acid pickling tank, the side spraying unit is arranged on the side wall of the acid pickling tank, the bottom spraying unit is arranged on the bottom of the acid pickling tank, and the top spraying unit is arranged on the top crossbeam of the acid pickling tank. The main spraying unit comprises an inlet side main spraying unit and an outlet side main spraying unit, and a single main spraying unit has multiple nozzles to ensure covering a required spraying width. The side spraying unit comprises two groups of side sprays, each group of side sprays is arranged on the side wall of the acid pickling tank, and each group of side sprays comprises 3-8 side nozzles. The bottom spraying unit comprises multiple bottom nozzles, and the bottom nozzles are arranged along the length direction of the acid pickling tank. The top spraying unit comprises multiple top nozzles, and the top nozzles are arranged along the length direction of the acid pickling tank.

2. The visualizing pickling apparatus of claim 1, wherein: The strip steel supporting mechanism comprises two groups of supporting rollers arranged at the inlet of the acid pickling tank and the outlet of the acid pickling tank and an immersion roller arranged at the middle part of the acid pickling tank, and the rotating speeds of the supporting rollers and the immersion roller are adjustable.

3. The visualizing pickling apparatus according to claim 1 or 2, characterized in that: The strip steel supporting mechanism comprises multiple andesite blocks, and the andesite blocks are arranged on the tank bottom along the running direction of the strip steel.

4. The visualizing pickling apparatus of claim 1, wherein: The acid pickling tank is further provided with at least one blocking roller, and the blocking rollers are arranged on the tank top along the running direction of the strip steel.

5. A pickling simulation test method characterized by, The method comprises: The method comprises: The strip is passed through the acid pickling tank, image information at a target plane is collected by the particle image velocimetry, the image information is processed, and a flow state at the target plane is obtained.

6. The simulated pickling test method according to claim 5, wherein The acid spraying mechanism comprises a main spraying unit, a side spraying unit, a bottom spraying unit and a top spraying unit, one or more groups of acid spraying units are opened, nozzle parameters of the opened acid spraying units are adjusted, influences of a single group of acid spraying units on a flow field in the tank and / or coupling influences of multiple groups of acid spraying units on the flow field in the tank are researched, and the nozzle parameters comprise at least one of a nozzle quantity, a position, a flow and a spraying angle.

7. The simulated pickling test method according to claim 5, wherein The strip parameters are adjusted to research influences of strip running on a flow field in the tank, and the strip parameters comprise at least one of a strip size, a strip running speed and a strip sag.

8. The simulated pickling test method according to claim 5, wherein The parameters of the strip steel supporting mechanism are adjusted to research influences of the strip supporting mechanism on a flow field in the tank.

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