Pickling system capable of preventing hydrogen accumulation and production control method thereof

Abstract

The present application relates to a pickling system capable of preventing hydrogen accumulation, comprising a pickling tank, a plurality of acid mist exhaust openings are arranged on the top of the pickling tank, each of the acid mist exhaust openings is connected with an acid mist exhaust pipe, each of the acid mist exhaust pipes is connected with an acid mist purification pipe, the acid mist purification pipe is connected with an acid mist purification mechanism, and auxiliary gas injection openings are arranged at the inlet and outlet of the pickling tank. The present application also relates to a production control method of the pickling system. In the present application, the pickling system can operate in normal production conditions and emergency conditions. In the emergency conditions, the normal acid mist exhaust mode is switched to the air blowing acid mist exhaust mode by injecting auxiliary gas into the pickling tank through the auxiliary gas injection openings, so that the accumulated acid mist and hydrogen in the pickling tank can be quickly exhausted, thereby ensuring the safety and reliability of the pickling system.

Description

Technical Field

[0001] This invention belongs to the technical field of cold rolling processing lines, specifically relating to a pickling system that can prevent hydrogen accumulation and a production control method for the pickling system. Background Technology

[0002] The pickling process mainly includes a pickling tank and a rinsing tank. In the pickling tank, the acid reacts chemically with the iron oxide scale on the surface of the strip steel to remove the iron oxide scale. The rinsing tank cleans the surface of the strip steel that has come out of the pickling tank to remove any remaining pickling residue.

[0003] During the pickling process, achieving the perfect pickling temperature is difficult, making it impossible to guarantee neither under-pickling nor over-pickling. To avoid under-pickling, the acid temperature and concentration are typically increased. Under these conditions, the strip steel is over-pickled, and the acid reacts with the strip substrate, producing hydrogen gas. Hydrogen gas is an inevitable byproduct of pickling; if the hydrogen concentration accumulates to a certain level, it can cause a hydrogen explosion, damaging equipment, causing unit shutdowns, and resulting in significant losses. Summary of the Invention

[0004] This invention relates to an acid pickling system that can prevent hydrogen accumulation and a production control method for the acid pickling system, which can at least solve some of the defects of the prior art.

[0005] This invention relates to an acid pickling system that can prevent hydrogen accumulation, comprising an acid pickling tank, wherein the top of the acid pickling tank is provided with multiple acid mist exhaust ports, each of the acid mist exhaust ports is connected to an acid mist emission pipe, each of the acid mist emission pipes is connected to an acid mist purification pipe, and the acid mist purification pipe is connected to an acid mist purification mechanism; auxiliary air nozzles are provided at both the inlet and outlet of the acid pickling tank.

[0006] As one embodiment, a hydrogen concentration detector is installed on at least one of the following: the cover of the pickling tank, each of the acid mist emission pipes, and the acid mist purification pipe.

[0007] As one implementation method, the pickling system also includes a central control system, with each of the hydrogen concentration detectors connected to the central control system. The central control system is used to execute an acid mist control strategy based on the detection signals from each of the hydrogen concentration detectors and / or the predictions from the acid mist concentration prediction model.

[0008] As one implementation method, an exhaust fan is provided at least one of the acid mist exhaust ports, the acid mist emission pipes, and the acid mist purification pipes.

[0009] As one embodiment, the acid mist purification mechanism includes an acid mist condenser and a scrubbing tower connected in sequence.

[0010] As one embodiment, the pickling tank is equipped with a sealing door at both the inlet and outlet, and a double-layer sprayer is installed inside the sealing door.

[0011] The present invention also relates to a production control method for the above-mentioned pickling system, the method comprising:

[0012] Under normal production conditions, the acid mist in the pickling tank is extracted through each of the acid mist exhaust ports to the acid mist purification unit for purification treatment;

[0013] In emergency situations, auxiliary gas is injected into the pickling tank through the auxiliary gas nozzle, switching the normal exhaust mode to a blower mode to quickly remove the acid mist and hydrogen accumulated in the tank.

[0014] As one implementation method, the method further includes:

[0015] The system can be determined to operate under normal production conditions or emergency conditions by detecting the hydrogen concentration in the acid mist and / or by using an acid mist concentration prediction model.

[0016] As one embodiment, the acid mist purification mechanism includes an acid mist condenser and a scrubbing tower connected in sequence;

[0017] The method further includes:

[0018] Under normal production conditions, industrial circulating water is introduced into the acid mist condenser as a cooling medium, and industrial water is sprayed into the washing tower.

[0019] In emergency situations, chilled water is introduced into the acid mist condenser as a cooling medium, and alkaline solution is sprayed into the scrubbing tower.

[0020] As one implementation method, the auxiliary gas is compressed air.

[0021] The present invention has at least the following beneficial effects:

[0022] In this invention, the pickling system can operate under normal production conditions and emergency conditions. Under emergency conditions, auxiliary gas is injected into the pickling tank through the auxiliary gas nozzle, switching the normal exhaust mode to the blower mode, which can quickly remove the acid mist and hydrogen accumulated in the tank, thereby ensuring the safety and reliability of the pickling system operation. Attached Figure Description

[0023] 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.

[0024] Figure 1 and Figure 2 This is a schematic diagram of the pickling system provided in an embodiment of the present invention;

[0025] Figure 3 This is a schematic diagram of the iron sludge treatment subsystem provided in an embodiment of the present invention;

[0026] Figure 4 for Figure 3 Top view;

[0027] Figure 5 This is a schematic diagram of the iron sludge collection box provided in an embodiment of the present invention;

[0028] Figure 6 This is a side view of the electromagnetic filter provided in an embodiment of the present invention;

[0029] Figure 7 This is a top view of the electromagnetic filter provided in an embodiment of the present invention;

[0030] Figure 8 This is a schematic diagram of the front view structure of an electromagnetic filter provided in an embodiment of the present invention;

[0031] Figure 9 This is a schematic diagram of an acid pickling adjustment framework provided in an embodiment of the present invention;

[0032] Figure 10 This is a schematic diagram of another pickling adjustment framework provided in an embodiment of the present invention;

[0033] Figure 11 This is a schematic diagram of a neural network model provided in an embodiment of the present invention;

[0034] Figure 12 This is a schematic diagram illustrating the adjustment and updating of weighting coefficients in a neural network model provided in an embodiment of the present invention. Detailed Implementation

[0035] 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.

[0036] Example 1

[0037] like Figure 1 and Figure 2This invention provides an acid pickling system that can prevent hydrogen accumulation, including an acid pickling tank 1. The top of the acid pickling tank 1 is provided with a plurality of acid mist exhaust ports 13. Each acid mist exhaust port 13 is connected to an acid mist emission pipe 14. Each acid mist emission pipe 14 is connected to an acid mist purification pipe 15. The acid mist purification pipe 15 is connected to an acid mist purification mechanism. The inlet and outlet of the acid pickling tank 1 are provided with auxiliary air nozzles 16.

[0038] The pickling tank 1 mentioned above includes a tank body and a tank cover, and the acid mist exhaust port 13 is provided on the tank cover; in one embodiment, the tank cover is a single-layer arc-shaped structure.

[0039] Preferably, a plurality of side nozzles 12 are provided on the side wall of the acid tank for spraying acid into the pickling tank 1; correspondingly, the pickling system is also equipped with an acid tank 2, which is provided with an acid supply pipeline and an acid return pipeline. Each side nozzle 12 is connected to the acid supply pipeline, and the acid return pipeline is connected to the acid overflow port on the acid tank, so as to realize the circulation of acid; an acid pump and a heat exchanger are generally arranged on the acid supply pipeline.

[0040] Preferably, each acid mist exhaust port 13 is distributed into multiple exhaust port groups, and each exhaust port group is arranged sequentially along the running direction of the strip steel. Each exhaust port group includes multiple acid mist exhaust ports 13 arranged sequentially along the width direction of the pickling tank 1.

[0041] In one embodiment, such as Figure 1 and Figure 2 The pickling tank 1 is equipped with sealing doors 11 at both its inlet and outlet, and a jacketed sprayer is installed inside each sealing door 11. Preferably, the sealing door 11 has a multi-layered labyrinth structure. By using the sealing door 11, multiple sealing effects of mechanical sealing and spray sealing can be achieved, reducing the risk of acid mist escape. The jacketed sprayer includes, but is not limited to, using demineralized water as the spray medium.

[0042] The aforementioned auxiliary air nozzle 16 is preferably located near the sealing door 11 on the corresponding side. The aforementioned auxiliary air nozzle 16 is connected to an auxiliary air source via an auxiliary air supply pipe. In one embodiment, the auxiliary air is compressed air.

[0043] In one embodiment, a hydrogen concentration detector is installed on at least one of the following locations: the cover of the pickling tank 1, each of the acid mist emission pipes 14, and the acid mist purification pipe 15. This detector can monitor the hydrogen concentration in the acid mist in real time. Preferably, hydrogen concentration detectors are installed on the cover of the pickling tank 1 (generally on the inner wall of the cover), inside each acid mist emission pipe 14, and inside each acid mist purification pipe 15.

[0044] In one embodiment, an exhaust fan is provided at least one of the acid mist exhaust ports 13, the acid mist emission pipes 14, and the acid mist purification pipes 15. Preferably, an exhaust fan is provided at each of the acid mist exhaust ports 13, the acid mist emission pipes 14, and the acid mist purification pipes 15. In particular, a duct fan is installed at each of the acid mist exhaust ports 13 and the acid mist emission pipes 14 to quickly remove the gas from the tank.

[0045] In one embodiment, the pickling system further includes a central control system, wherein each of the hydrogen concentration detectors is connected to the central control system. The central control system is used to execute an acid mist control strategy based on the detection signals from each of the hydrogen concentration detectors and / or the predictions from an acid mist concentration prediction model. The specific acid mist control strategy will be described in subsequent embodiments and will not be detailed here.

[0046] In one embodiment, such as Figure 2 The acid mist purification mechanism includes an acid mist condenser 31 and a scrubbing tower 32 connected in sequence.

[0047] Example 2

[0048] This invention provides a production control method for the pickling system provided in Embodiment 1 above, the method comprising:

[0049] Under normal production conditions, the acid mist in the pickling tank 1 is extracted to the acid mist purification mechanism for purification treatment through each of the acid mist exhaust ports 13.

[0050] In emergency situations, auxiliary gas is injected into the pickling tank 1 through the auxiliary gas nozzle 16, switching the normal exhaust mode to a blower mode to quickly remove the acid mist and hydrogen accumulated in the tank.

[0051] Preferably, the method further includes:

[0052] The system can be determined to operate under normal production conditions or emergency conditions by detecting the hydrogen concentration in the acid mist and / or by using an acid mist concentration prediction model.

[0053] The method for detecting hydrogen concentration in acid mist can be implemented based on the arrangement structure of the hydrogen concentration detectors in Example 1 above. Specifically, based on the hydrogen concentration monitoring and early warning software, the system's safety can be determined according to the data detected by each hydrogen concentration detector. If unsafe, an alarm will be triggered and an emergency production mode will be activated.

[0054] Preferably, the acid mist concentration prediction model is established by collecting data on acid temperature, acid pump pressure, acid concentration, and hydrogen concentration in the acid mist from actual production. Based on the established acid mist concentration prediction model, the acid temperature, acid pump pressure, and acid concentration data are collected in real time to obtain the predicted value of hydrogen concentration in the acid mist. The system safety is determined based on the predicted value of hydrogen concentration in the acid mist. If it is not safe, an alarm is triggered and an emergency production mode is activated.

[0055] The above acid mist concentration prediction model is specifically expressed as follows:

[0056] y = f(aT) b P c C d )

[0057] Where y is the predicted hydrogen concentration in the acid mist; T is the acid temperature; P is the acid pump pressure; C is the acid concentration; and a, b, c, and d are coefficients.

[0058] By continuously training the model, the accuracy of its predictions can be improved.

[0059] Preferably, the above two methods are used to make judgments simultaneously. If the hydrogen concentration in the acid mist obtained by either method exceeds the set threshold, the emergency production mode will be triggered.

[0060] Preferably, in emergency situations, all exhaust fans are turned on to increase the gas emission rate in the pickling tank 1. Additionally, in emergency situations, water mist is used to seal the sealing door 11, creating a closed environment inside the pickling tank 1, further increasing the air pressure and volume within the tank, thus improving the efficiency and effectiveness of the blower in removing acid mist.

[0061] For cases where the acid mist purification mechanism includes an acid mist condenser 31 and a scrubbing tower 32, preferably, the method further includes:

[0062] Under normal production conditions, industrial circulating water is introduced into the acid mist condenser 31 as a cooling medium, and industrial water is sprayed into the scrubbing tower 32.

[0063] In emergency situations, chilled water is introduced into the acid mist condenser 31 as a cooling medium, and alkaline solution is sprayed into the scrubbing tower 32.

[0064] Based on the above scheme, the consumption of alkali solution can be significantly reduced.

[0065] In addition, implementing acid mist control strategies by online detection of hydrogen concentration and / or prediction of hydrogen concentration in acid mist can effectively reduce the consumption of demineralized water and auxiliary gas.

[0066] As described in Embodiment 1 above, the auxiliary gas includes, but is not limited to, compressed air.

[0067] Example 3

[0068] This embodiment optimizes the first embodiment described above. Specifically, the acid tank 2 is equipped with an iron sludge treatment subsystem for online cleaning of iron sludge impurities in the acid tank 2, which can improve the operational stability and reliability of the pickling system and reduce downtime for sludge removal.

[0069] like Figure 3 and Figure 4 The iron sludge treatment subsystem includes an intermediate medium circulation mechanism and an iron sludge recovery mechanism. The intermediate medium circulation mechanism includes several intermediate media 330 capable of extracting iron sludge from the bottom of the acid tank 2, and a medium conveying unit 331, a medium transfer unit 332, and a medium return unit 333 connected in sequence. The medium conveying unit 331 is connected to the intermediate medium outlet of the acid tank 2, and the medium return unit 333 is connected to the intermediate medium inlet of the acid tank 2. The iron sludge recovery mechanism includes a flushing unit arranged above the medium transfer unit 332 and an iron sludge collection box 321 arranged below the medium transfer unit 332.

[0070] In one embodiment, the intermediate medium 330 includes medium steel balls for entraining iron sludge, which can conveniently carry out the iron sludge from the bottom of the acid tank 2. The iron sludge at the bottom of the acid tank 2 is entrained by the layered flowing steel balls and carried out of the acid tank 2 by the medium conveying unit 331. When the surface of the medium steel balls is designed to have a certain roughness, the entrainment effect of the iron sludge can be improved. In one embodiment, the surface roughness Ra of the medium steel balls is ≥0.8μm, and more preferably controlled to Ra≤12μm.

[0071] In one embodiment, such as Figure 3 The bottom of the acid tank 2 is provided with a ramp that slopes from the intermediate medium inlet to the intermediate medium outlet, facilitating the flow of the intermediate medium 330 within the acid tank 2. For example, the medium steel balls can move from the intermediate medium inlet to the intermediate medium outlet by gravity. Moreover, the medium steel balls at higher positions exert a squeezing and driving effect on the medium steel balls at lower positions and the iron sludge on the slope. Based on the circulation of the medium steel balls, the bottom of the acid tank 2 is always in motion, which can reduce the accumulation of iron sludge and thus save the intervention of power equipment. At the same time, the design of the ramp also facilitates the deposition of iron sludge at the intermediate medium outlet, thereby making it easier for the intermediate medium 330 to carry the iron sludge out.

[0072] In one embodiment, the aforementioned medium conveying unit 331 employs a screw pump or a screw conveyor. Depending on the relative positional relationship between the intermediate medium outlet and the medium transfer unit 332, the screw pump or screw conveyor can be arranged at an angle or horizontally.

[0073] In one embodiment, such as Figure 3 and Figure 4 The media transfer unit 332 adopts a chain conveyor unit, such as a chain plate conveyor or a drag chain conveyor. Accordingly, the media transfer unit 332 includes an upper chain layer 3321 and a lower chain layer 3322.

[0074] In this case, the gap between the chain plates of the chain conveyor unit is smaller than the size of the intermediate medium 330, for example, smaller than the diameter of the medium steel ball.

[0075] The media conveying unit 331 is connected to the upper chain layer 3321. For example, the media output port of the media conveying unit 331 is located directly above the upper chain layer 3321, which can convey the intermediate media 330 to the upper chain layer 3321. Optionally, a hopper is arranged above the upper chain layer 3321 to receive the intermediate media 330 output by the media conveying unit 331 and transfer it to the upper chain layer 3321. This can prevent the intermediate media 330 from being ejected from the upper chain layer 3321 due to excessive drop distance.

[0076] The media return unit 333 is located on the outlet side of the chain conveyor unit. Optionally, the media return unit 333 is a conveyor roller conveyor used to transport the cleaned intermediate media 330 back to the acid tank 2.

[0077] The rinsing unit is used to rinse the intermediate medium 330 on the medium transfer unit 332, thereby separating the iron sludge from the intermediate medium 330. In one embodiment, such as Figure 4 The rinsing unit includes a rinsing pipe 351, and at least one set of spray structures can be arranged at the bottom of the rinsing pipe 351. When there are multiple sets of spray structures, each spray structure is arranged sequentially along the conveying direction of the intermediate medium 330. Each set of spray structures includes at least one nozzle. When there are multiple nozzles in the spray structure, each nozzle in the spray structure is preferably arranged sequentially along the width direction of the medium transfer unit 332.

[0078] Furthermore, such as Figure 4 The rinsing unit further includes a rinsing fluid supply pipe 352, which is connected to the rinsing pipe 351 and is used to supply rinsing fluid. Preferably, the surface water of the acid tank 2 is used as the rinsing fluid, and correspondingly, the rinsing fluid supply pipe 352 is connected to the upper part of the acid tank 2.

[0079] The flushing fluid can exit via both sides of the media transfer unit 332, and / or, the media transfer unit 332 is a perforated conveying device, for example, it can exit via the gaps between the chain plates of the aforementioned chain conveyor unit. In one embodiment, such as Figure 3 and Figure 5The iron sludge recovery mechanism also includes a diversion unit 322, which is arranged between the upper chain layer 3321 and the lower chain layer 3322 of the media transfer unit 332. The top inlet of the diversion unit 322 is located directly below the flushing unit, and the bottom outlet of the diversion unit 322 is located directly above the iron sludge collection tank 321. Based on this design, the flushing fluid can be reliably diverted to the iron sludge collection tank 321, resulting in a cleaner on-site environment. Simultaneously, flushing water carrying iron sludge is prevented from contaminating the lower chain layer 3322, thereby improving the operational reliability of the media transfer unit 332 and reducing its maintenance frequency.

[0080] Preferably, such as Figure 3 and Figure 5 The aforementioned drainage unit 322 has an inverted Y-shaped structure, forming one drainage inlet pipe and two drainage outlet pipes. The two drainage outlet pipes can ensure the drainage efficiency and effect of the flushing fluid, and also facilitate the arrangement of the lower chain layer 3322, for example, the lower chain layer 3322 is located between the two drainage outlet pipes.

[0081] The upper chain layer 3321 can be arranged inside the inlet pipe, which can better capture the intermediate medium 330 and iron sludge splashed by the high-pressure jet.

[0082] Preferably, such as Figure 5 The aforementioned diversion unit 322 is connected to the iron sludge collection box 321 to form an integral structure. For example, for the aforementioned inverted Y-shaped diversion unit 322, its outer frame 3221 is integrally formed with the iron sludge collection box 321 to form a top-closed box. An inverted V-shaped mud baffle 3222 is set inside the box, which correspondingly forms the inner frame of the diversion unit 322.

[0083] In one embodiment, a protective net 323 is also arranged around the upper chain layer 3321 of the media transfer unit 332, and the protective area of ​​the protective net 323 at least covers the rinsing area of ​​the upper chain layer 3321. By setting the protective net 323, the high-pressure jet can prevent the intermediate medium 330 from being ejected from the media transfer unit 332.

[0084] The protective net 323 can provide lateral protection. Optionally, the protective net 323 includes two side mesh panels 3231, which are respectively arranged on both sides of the conveying channel of the medium transfer unit 332. The side mesh panels 3231 are preferably not movable together with the medium transfer unit 332. For example, they are installed through mesh panel brackets. For the above-mentioned scheme with a diversion unit 322, the side mesh panels 3231 can also be installed on the outer frame 3221 of the diversion unit 322.

[0085] And / or, the protective net 323 can provide top protection. Optionally, the protective net 323 includes a top mesh panel 3232, which is installed above the media transfer unit 332. The top mesh panel 3232 is preferably not movable together with the media transfer unit 332, and its installation method can refer to the installation method of the side mesh panel 3231.

[0086] Further optimize the above-mentioned iron sludge treatment subsystem, such as Figure 3 and Figure 4 The iron sludge recycling mechanism also includes a filtration unit, and the iron sludge collection box 321 is provided with a flushing liquid recycling pipe connected to the filtration unit.

[0087] Optionally, the filtrate produced by the filtration unit can be reused as rinsing fluid. For example, the filtrate outlet pipe of the filtration unit is connected to a rinsing fluid storage tank, and the aforementioned rinsing fluid supply pipe 352 is also connected to the rinsing fluid storage tank. When the rinsing fluid is the surface water of the acid tank 2, the filtrate produced by the filtration unit can be returned to the acid tank 2, and correspondingly, the filtrate outlet pipe of the filtration unit is connected to the acid tank 2.

[0088] The iron sludge collection tank 321 can control the direction of the flushing fluid by overflow, and the aforementioned flushing fluid recovery pipe is connected to the overflow level of the iron sludge collection tank 321. Heavier impurities will settle at the bottom of the iron sludge collection tank 321 and can be cleaned periodically or irregularly.

[0089] In one embodiment, the filtration unit includes an electromagnetic filter 100 for removing ferromagnetic impurities from the rinsing fluid, which can reliably adsorb and remove suspended ferromagnetic impurities in the rinsing fluid.

[0090] Example 4

[0091] This embodiment provides an electromagnetic filter 100, which can be used in the above embodiment three.

[0092] like Figures 6-8 The electromagnetic filter 100 includes a filter tank 101, a filter disc 102, and an impurity collector 103. The filter disc 102 includes an annular support 1021, a plurality of electromagnetic chucks 1022, and an electronic control unit for controlling the gain and loss of power of each electromagnetic chuck 1022. Each electromagnetic chuck 1022 is mounted on the annular support 1021 and is arranged in a ring along the circumference of the annular support 1021. The annular support 1021 is provided with a rotary drive mechanism 105 for driving its rotation. The annular support 1021 is partially located in the filter tank 101. The impurity collector 103 is arranged outside the filter tank 101 and includes an impurity removal section for removing impurities from the electromagnetic chucks 1022.

[0093] In one embodiment, the aforementioned annular support 1021 includes an inner ring frame and an outer ring frame, which are connected by a plurality of spokes. Each spoke divides the annular area between the inner ring frame and the outer ring frame into a plurality of suction cup mounting positions, and each suction cup mounting position is equipped with an electromagnetic chuck 1022.

[0094] Optionally, such as Figure 6 The spokes are radially distributed along the annular support 1021, and the inner ring frame, spokes, and outer ring frame are connected to form a hub shape.

[0095] The electromagnetic chuck 1022 is preferably detachably mounted on the annular bracket 1021, including but not limited to fixing with screws.

[0096] The surface of the electromagnetic chuck 1022 is preferably coplanar with the corresponding side surface of the annular support 1021. This facilitates the removal of impurities from the electromagnetic chuck 1022 and prevents the formation of corners between the electromagnetic chuck 1022 and the annular support 1021, which could lead to dirt accumulation.

[0097] Preferably, the annular bracket 1021 is connected to the rotary drive mechanism 105 via a bracket shaft 104. The rotary drive mechanism 105 drives the bracket shaft 104 to rotate, thereby causing the annular bracket 1021 and the electromagnetic chuck 1022 on the annular bracket 1021 to rotate.

[0098] In one embodiment, the rotary drive mechanism 105 adopts a structure of motor + transmission assembly. The transmission assembly can be a chain drive, belt pulley drive, or the like. The motor is preferably a variable frequency motor, which can control the rotational speed of the ring support 1021.

[0099] Preferably, the electrical control unit includes multiple electrical control cables and an electrical control module. The number of electrical control cables is the same as that of the electromagnetic chuck 1022 and they are connected in a one-to-one correspondence. Each electrical control cable is electrically connected to the electrical control module.

[0100] In one embodiment, the bracket shaft 104 is a hollow shaft, and all the electrical control cables are routed through the hollow cavity of the bracket shaft 104. This method facilitates the laying of electrical control cables and provides high safety and reliability. Preferably, a cable routing hole is provided on the annular bracket 1021 (e.g., the inner ring bracket) to facilitate the entry of the electrical control cables into the bracket shaft 104; a cable routing channel is also provided in the electromagnetic chuck 1022 to connect the electrical control cables to the coil inside the electromagnetic chuck 1022.

[0101] Preferably, the annular bracket 1021 is detachably mounted on the bracket shaft 104. In one embodiment, the bracket shaft 104 is segmented, with the annular bracket 1021 clamped between two shaft segments 1041 of the bracket shaft 104 (generally, the inner annular bracket is clamped between the two shaft segments 1041 of the bracket shaft 104). Optionally, a shoulder is machined on the shaft segment 1041, and the two ends of the inner hole of the inner annular bracket adopt a stepped hole structure. The journal at the end of the shaft segment 1041 is inserted into the large-diameter hole in the corresponding stepped hole structure, and the shoulder of the shaft segment 1041 abuts against the corresponding end face of the inner annular bracket, and the two are fixed by screws.

[0102] Furthermore, during the assembly of the rotating shaft segment 1041 and the inner ring frame, the electromagnetic chuck 1022 can be further clamped between them. For example, the outer ring wall of the inner ring frame adopts a stepped shaft structure, and a clamping groove is formed between the shoulder of one of the rotating shaft segments 1041 and the large-diameter wall of the stepped shaft outer ring wall. The corresponding side end of the electromagnetic chuck 1022 is clamped in the clamping groove. This method can improve the stability and reliability of the installation of the electromagnetic chuck 1022. In particular, when the electrical control cable needs to enter the electromagnetic chuck 1022 through the bracket rotating shaft 104, the above structure can ensure the alignment accuracy between the wiring hole on the ring bracket 1021 and the wiring channel in the electromagnetic chuck 1022, thereby avoiding damage to the electrical control cable and other malfunctions.

[0103] In one embodiment, the electronic control module includes a central controller and a conductive slip ring. Each of the electronic control cables is connected to the rotor portion of the conductive slip ring, and the central controller is connected to the stator portion of the conductive slip ring. Preferably, the rotor portion of the conductive slip ring is mounted on the support shaft 104. Based on this structure, reliable control of the gain and loss of power to each electromagnetic chuck 1022 can be ensured when the electromagnetic chuck 1022 is rotating normally.

[0104] The aforementioned central control unit includes, but is not limited to, a PLC controller.

[0105] When the annular support 1021 drives each electromagnetic chuck 1022 to rotate, some electromagnetic chucks 1022 are immersed in the filter tank 101 from outside the filter tank 101, while some electromagnetic chucks 1022 leave the filter tank 101 and swing upwards. For the upward-swinging electromagnetic chucks 1022, ferromagnetic impurities are adsorbed on their surface. The liquid that is carried away and the liquid in the adsorbed impurities can leave the electromagnetic chucks 1022 under the action of gravity, thus achieving the effect of gravity dehydration. The impurities collected in the impurity collector 103 have a low water content, which not only facilitates the subsequent treatment of impurities, but also reduces the loss of liquid in the filter tank 101.

[0106] In one embodiment, such as Figure 7 and Figure 8The filter disc 102 further includes a water-retaining ring 1023, which is coaxially mounted on the support shaft 104 and abuts against the disc surface of each electromagnetic chuck 1022. An annular water-retaining edge protrudes from the outer ring wall of the water-retaining ring 1023, and this annular water-retaining edge, together with each electromagnetic chuck 1022, forms a water-retaining groove. By setting the water-retaining ring 1023, the liquid can be effectively guided, preventing liquid from entering the support shaft 104 and other areas, thus avoiding interference with the normal operation of the electronic control unit.

[0107] Preferably, there are two water-blocking rings 1023, which are arranged on both sides of the annular support 1021.

[0108] Preferably, a sealing gasket can be sandwiched between the water-blocking ring 1023 and the electromagnetic chuck 1022 to improve the water-blocking effect.

[0109] At the impurity collection station, impurities can be scraped off the surface of the electromagnetic chuck 1022, or the surface of the electromagnetic chuck 1022 can be rinsed with high-pressure water or high-pressure air.

[0110] In one embodiment, such as Figures 6-8 The impurity removal unit includes a scraper 1031, the working end of which contacts the surface of an electromagnetic chuck 1022 located at the impurity collection position; the impurity collector 103 also includes an impurity collection groove 1032, which is connected to the lower part of the scraper 1031. This method has low energy consumption and high reliability.

[0111] Generally, both sides of the electromagnetic chuck 1022 can adsorb impurities. Therefore, it is preferable to provide a scraper 1031 and an impurity collection groove 1032 on both sides of the annular support 1021 respectively. The distance between the working ends of the scraper 1031 on both sides is preferably the same as the thickness of the electromagnetic chuck 1022.

[0112] Preferably, such as Figure 7 and Figure 8 The aforementioned scraper blade 1031 is arranged at an angle, which facilitates the scraped impurities falling into the impurity collection tank 1032.

[0113] Optionally, the working end of the scraper 1031 is its top end, which is preferably parallel to the horizontal plane. That is, the contact line between the scraper 1031 and the electromagnetic chuck 1022 is parallel to the horizontal plane. This method can facilitate the arrangement of the scraper 1031, the impurity collection tank 1032, etc., and facilitate the collection of impurities.

[0114] Preferably, the scraper 1031 is a grooved plate. The length direction of the scraper 1031 is defined as the direction from its working end to the impurity collection groove 1032. Wings are formed at the two transverse ends of the scraper 1031, which can better constrain and guide the scraped impurities.

[0115] As a preferred embodiment, such as Figure 7 and Figure 8 The filter discs 102 are in multiple sets, and each of the annular brackets 1021 is sequentially mounted on the same bracket shaft 104, which is connected to the rotary drive mechanism 105. Providing multiple sets of filter discs 102 can improve filtration efficiency and filtration effect.

[0116] like Figure 7 Two adjacent filter discs 102 can share a single impurity collection tank 1032.

[0117] Preferably, such as Figure 7 Multiple partitions are provided in the filter tank 101, and each partition divides the filter tank 101 into multiple liquid storage tanks 1011. Preferably, each liquid storage tank 1011 is provided with a filter plate 102. The number of filter plates 102 and liquid storage tanks 1011 is preferably the same and they are configured in a one-to-one correspondence.

[0118] In one embodiment, upstream wastewater can be allowed to enter each storage tank 1011 simultaneously.

[0119] In another embodiment, the storage tanks 1011 can be connected in series. Upstream wastewater first enters the first storage tank 1011, and the wastewater flows between the upstream and downstream storage tanks 1011 via overflow. This allows for continuous wastewater treatment in a streamlined manner, ensuring treatment effectiveness and efficiency. Figure 7 In the first liquid storage tank 1011, the filter plate 102 is preferably arranged close to the sewage inlet, which can capture ferromagnetic impurities in the sewage in the first time and improve the electromagnetic filtration effect; in the last liquid storage tank 1011, the filter plate 102 is preferably arranged close to the filtrate outlet, which can improve the cleanliness of the discharged filtrate.

[0120] In particular, based on the segmented design of the bracket shaft 104 described above, it is convenient to install and arrange each filter disc 102; the number of filter discs 102 can be increased or decreased as needed, so the flexibility is very high; and it is convenient to maintain the equipment, for example, the filter discs 102 at the corresponding liquid storage tank 1011 can be disassembled and assembled without affecting the filtration process in other liquid storage tanks 1011.

[0121] The method of using the electromagnetic filter 100 mentioned above includes:

[0122] The annular support 1021 drives the electromagnetic chucks 1022 to rotate, allowing the electromagnetic chucks 1022 to circulate between the working position, the dehydration position, and the impurity removal position.

[0123] In the working position, the electromagnetic chuck 1022 is energized and at least partially immersed in the filter tank 101 to adsorb ferromagnetic impurities in the filter tank 101.

[0124] In the dehydration position, the electromagnetic chuck 1022 remains energized;

[0125] At the impurity removal station, the electromagnetic chuck 1022 is de-energized, and the impurity removal unit removes the impurities from the electromagnetic chuck 1022 and collects them.

[0126] Example 5

[0127] The embodiments of the present invention further optimize Embodiment 1.

[0128] like Figures 9-12 The pickling system also includes:

[0129] The pickling quality quantitative evaluation module is used to obtain the pickling quality and feed it back to the PLC;

[0130] The PLC is used to receive the pickling quality feedback from the pickling quality quantitative evaluation module and calculate the motor torque accordingly.

[0131] An electric motor is used to adjust the speed of the strip according to the torque, for example, to accelerate or decelerate the strip as needed.

[0132] The PC is used to adjust the relevant parameters of the PLC based on the pickling quality feedback from the pickling quality quantitative evaluation module and the preset pickling quality, and then send the results to the PLC to achieve pickling regulation.

[0133] In practical applications, after mechanical descaling and surface heating, the strip steel enters the pickling tank, undergoes multi-stage rinsing, and is then dried and coiled by hot air. Each stage of the process, including mechanical descaling and pickling, includes an image data acquisition module, a visualization module, and a quantitative evaluation module for pickling quality. During the pickling process, the image data acquisition module (e.g., a camera) collects image data of the strip steel, which is then visualized by the visualization module. The quantitative evaluation module then assesses and scores the cleaning quality of the strip steel. Furthermore, the system possesses a neural network self-learning feedback adjustment function; after multiple training iterations, the pickling system can quantitatively adjust the pickling quality of the strip steel.

[0134] In this embodiment of the invention, feedback control is based on a quantitative evaluation module for pickling quality, which has a high degree of digitalization and can achieve quantitative adjustment. Using this embodiment, the strip speed control response time is shorter than that of traditional PID control, exhibiting better real-time performance and less overshoot. Furthermore, the PID controller parameters can be adjusted according to operating conditions, thereby achieving superior control performance.

[0135] In one embodiment, the training samples of the neural network model on the PC are collected by the PLC, and the samples include 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. For example... Figure 11 As shown.

[0136] 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.

[0137] Furthermore, the neural network model is trained using the backpropagation (BP) algorithm, where the performance metric function is:

[0138]

[0139] 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.

[0140] 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.

[0141] 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.

[0142] On one hand, the activation function of the hidden layer is:

[0143]

[0144] Other activation functions can also be used in the hidden layer.

[0145] On the other hand, the activation function of the output layer is:

[0146]

[0147] The output layer can also use other activation functions.

[0148] In one embodiment, gradient descent is used to adjust and update the weighting coefficients of the neural network model.

[0149] Furthermore, the step of adjusting and updating the weighting coefficients of the neural network model using gradient descent specifically includes:

[0150] 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;

[0151] 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.

[0152] 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;

[0153] S4. The output value of the PID controller is calculated based on the adjustable parameters of the PID controller of the PLC;

[0154] S5. Perform neural network model learning and adjust the weighting coefficients so that the adjustable parameters of the PID controller can be adaptively adjusted;

[0155] 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.

[0156] like Figure 12 As shown, the sampling period is set to 1 second, meaning the pickling system calls the neural network model once every 1 second. After the neural network model is trained, the pickling system can effectively control the quality of the acid solution. When encountering disturbances or parameter changes, the pickling system will quickly readjust the parameter values ​​to achieve better control.

[0157] Based on the same inventive concept, the embodiments of the present invention are also used to optimize Embodiment 2.

[0158] The production control methods for this pickling system also include:

[0159] The pickling quality quantitative evaluation module evaluates the pickling quality and feeds it back to the PLC.

[0160] The PLC receives the pickling quality feedback from the pickling quality quantitative evaluation module and calculates the motor torque accordingly.

[0161] The electric motor adjusts the speed of the strip according to the torque.

[0162] Based on the pickling quality feedback from the pickling quality quantitative evaluation module and the preset pickling quality, the PC adjusts the relevant parameters of the PLC through a neural network model and sends them to the PLC to achieve pickling regulation.

[0163] The embodiments of this production control method and the aforementioned pickling system can be implemented one-to-one, and will not be described in detail here.

[0164] The embodiments of the present invention can accelerate the cleaning speed, reduce energy consumption and acid consumption, thereby obtaining strip steel with high surface cleaning quality.

[0165] 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 pickling system that prevents hydrogen accumulation, comprising a pickling tank, characterized in that: The pickling tank has multiple acid mist exhaust ports on its top, each of which is connected to an acid mist emission pipe. Each acid mist emission pipe is connected to an acid mist purification pipe, which is connected to an acid mist purification mechanism. The pickling tank also has auxiliary air nozzles at its inlet and outlet. The pickling system is also equipped with an acid tank, which is provided with an acid supply pipeline and an acid return pipeline. The nozzles on each side are connected to the acid supply pipeline, and the acid return pipeline is connected to the acid overflow port on the pickling tank. The acid tank is equipped with an iron sludge treatment subsystem for online cleaning of iron sludge impurities in the acid tank. The iron sludge treatment system includes an intermediate medium circulation mechanism and an iron sludge recovery mechanism. The intermediate medium circulation mechanism includes several intermediate media capable of extracting iron sludge from the bottom of the container to be cleaned, and a medium conveying unit, a medium transfer unit, and a medium return unit connected in sequence. The medium conveying unit is connected to the intermediate medium outlet of the container to be cleaned, and the medium return unit is connected to the intermediate medium inlet of the container to be cleaned. The iron sludge recovery mechanism includes a flushing unit arranged above the medium transfer unit and an iron sludge collection box arranged below the medium transfer unit. The intermediate medium includes medium steel balls for entraining iron sludge. The bottom of the container to be cleaned is provided with a ramp, which slopes from the intermediate medium inlet to the intermediate medium outlet.

2. The pickling system as described in claim 1, characterized in that: A hydrogen concentration detector is installed on at least one of the following: the tank cover of the pickling tank, each of the acid mist emission pipes, and the acid mist purification pipe.

3. The pickling system as described in claim 2, characterized in that: It also includes a central control system, to which each of the hydrogen concentration detectors is connected. The central control system is used to execute acid mist control strategies based on the detection signals of each of the hydrogen concentration detectors and / or the predictions of the acid mist concentration prediction model.

4. The pickling system as described in claim 1, characterized in that: An exhaust fan is provided at least one of the acid mist exhaust ports, inside each of the acid mist emission pipes, and inside the acid mist purification pipes.

5. The pickling system as described in claim 1, characterized in that: The acid mist purification mechanism includes an acid mist condenser and a scrubbing tower connected in sequence.

6. The pickling system as described in claim 1, characterized in that: The pickling tank is equipped with sealed doors at both the inlet and outlet, and a double-layer sprayer is installed inside the sealed doors.

7. The production control method for the pickling system as described in any one of claims 1 to 6, characterized in that, The method includes: Under normal production conditions, the acid mist in the pickling tank is extracted through each of the acid mist exhaust ports to the acid mist purification unit for purification treatment; In emergency situations, auxiliary gas is injected into the pickling tank through the auxiliary gas nozzle, switching the normal exhaust mode to a blower mode to quickly remove the acid mist and hydrogen accumulated in the tank.

8. The production control method as described in claim 7, characterized in that, The method further includes: The system can be determined to operate under normal production conditions or emergency conditions by detecting the hydrogen concentration in the acid mist and / or by using an acid mist concentration prediction model.

9. The production control method as described in claim 7, characterized in that, The acid mist purification mechanism includes an acid mist condenser and a scrubbing tower connected in sequence. The method further includes: Under normal production conditions, industrial circulating water is introduced into the acid mist condenser as a cooling medium, and industrial water is sprayed into the washing tower. In emergency situations, chilled water is introduced into the acid mist condenser as a cooling medium, and alkaline solution is sprayed into the scrubbing tower.

10. The production control method as described in claim 7, characterized in that, The auxiliary gas is compressed air.

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