Pickling system capable of preventing hydrogen accumulation and production control method for pickling system

Abstract

The present invention relates to a pickling system capable of preventing hydrogen accumulation, comprising a pickling tank. A plurality of acid mist exhaust ports are formed in the tank top of the pickling tank, each acid mist exhaust port is connected to a corresponding acid mist discharging pipe, each acid mist discharging pipe is connected to an acid mist purification pipe, and the acid mist purification pipe is connected to an acid mist purification mechanism; and auxiliary air nozzles are each arranged at the inlet and the outlet of the pickling tank. In addition, the present invention also relates to a production control method for the pickling system. In the present invention, the pickling system is capable of operating in a normal production working condition and an emergency working condition, and in the emergency working condition, auxiliary air is sprayed into the pickling tank by means of the auxiliary air nozzle, so that a normal exhaust type acid mist discharging mode is switched into an air supply type acid mist discharging mode, and acid mist and hydrogen accumulated in the tank can be rapidly discharged, thereby ensuring the operation safety and reliability of the pickling system.

Description

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

[0001] The invention belongs to the technical field of cold rolling processing lines, and particularly relates to a pickling system capable of preventing hydrogen accumulation and a production control method of the pickling system. Background Art

[0002] The pickling process section mainly includes a pickling tank and a rinsing tank. The acid in the pickling tank reacts chemically with the iron oxide scale on the surface of the strip to remove the iron oxide scale. The rinsing tank cleans the residual pickling on the surface of the strip coming out of the pickling tank.

[0003] During the pickling process, achieving the perfect pickling temperature is difficult; it's 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 is over-pickled, and the acid reacts with the strip matrix, producing hydrogen. Hydrogen is an inevitable byproduct of pickling. If hydrogen concentration reaches a certain level, it can cause a hydrogen explosion, damaging equipment and causing unit shutdowns, resulting in significant losses.

[0004] Summary of the Invention

[0005] The present invention relates to a pickling system capable of preventing hydrogen accumulation and a production control method for the pickling system, which can at least solve some of the defects of the prior art.

[0006] The present invention relates to a pickling system capable of preventing hydrogen accumulation, comprising a pickling tank, wherein a plurality of acid mist exhaust ports are provided on the top of the pickling tank, each of the acid mist exhaust ports is connected to an acid mist discharge pipe, each of the acid mist discharge pipes is connected to an acid mist purification pipe, and the acid mist purification pipe is connected to an acid mist purification mechanism; auxiliary gas nozzles are provided at the inlet and outlet of the pickling tank.

[0007] As one of the implementation modes, a hydrogen concentration detector is installed on the tank cover of the pickling tank, at least one of each of the acid mist discharge pipes and the acid mist purification pipe.

[0008] As one of the embodiments, the pickling system also includes a central control system, and each of the hydrogen concentration detectors is connected to the central control system. The central control system is used to execute the acid mist control strategy based on the detection signal of each of the hydrogen concentration detectors and / or the prediction of the acid mist concentration prediction model.

[0009] As one of the implementation modes, an exhaust fan is provided at at least one of the acid mist exhaust ports, the acid mist discharge pipes, and the acid mist purification pipe.

[0010] As one of the implementation modes, the acid mist purification mechanism includes an acid mist condenser and a washing tower connected in sequence.

[0011] As one of the implementation modes, the inlet and outlet of the pickling tank are both provided with sealed doors, and an interlayer sprayer is provided inside the sealed doors.

[0012] The present invention also relates to a production control method for the above pickling system, the method comprising:

[0013] Under normal production conditions, the acid mist in the pickling tank is exhausted through the acid mist exhaust ports to the acid mist purification mechanism for purification treatment;

[0014] Under emergency conditions, auxiliary gas is sprayed into the pickling tank through the auxiliary gas nozzle, so that the normal exhaust mode of acid mist is switched to the blast mode of acid mist discharge, so as to quickly discharge the acid mist and hydrogen accumulated in the tank.

[0015] As one of the implementation modes, the method further includes:

[0016] By detecting the hydrogen concentration in the acid mist and / or predicting it through an acid mist concentration prediction model, it is determined whether the system should operate in normal production conditions or emergency conditions.

[0017] As one of the embodiments, the acid mist purification mechanism includes an acid mist condenser and a washing tower connected in sequence;

[0018] The method further comprises:

[0019] 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;

[0020] Under emergency conditions, chilled water is introduced into the acid mist condenser as a cooling medium, and alkaline solution is sprayed into the washing tower.

[0021] As one of the implementation modes, the auxiliary gas is compressed air.

[0022] The present invention has at least the following beneficial effects:

[0023] In the present invention, the pickling system can operate under normal production conditions and emergency conditions. Under emergency conditions, auxiliary gas is sprayed into the pickling tank through the auxiliary gas nozzle, so that the normal ventilation acid mist discharge mode is switched to the blast acid mist discharge mode, which can quickly discharge the acid mist and hydrogen accumulated in the tank, thereby ensuring the safety and reliability of the operation of the pickling system. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0025] Figures 1 and 2 are schematic structural diagrams of a pickling system provided in an embodiment of the present invention;

[0026] FIG3 is a schematic structural diagram of an iron sludge processing subsystem provided in an embodiment of the present invention;

[0027] FIG4 is a top view of FIG3;

[0028] FIG5 is a schematic structural diagram of an iron sludge collection box provided in an embodiment of the present invention;

[0029] FIG6 is a schematic side view of the structure of an electromagnetic filter provided in an embodiment of the present invention;

[0030] FIG7 is a schematic diagram of a top view of the electromagnetic filter provided in an embodiment of the present invention;

[0031] FIG8 is a schematic diagram of the main structure of an electromagnetic filter provided by an embodiment of the present invention;

[0032] FIG9 is a schematic diagram of a pickling adjustment framework provided by an embodiment of the present invention;

[0033] FIG10 is a schematic diagram of another pickling adjustment framework provided by an embodiment of the present invention;

[0034] FIG11 is a schematic diagram of a neural network model provided by an embodiment of the present invention;

[0035] FIG12 is a schematic diagram of adjusting and updating the weighted coefficients of the neural network model provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0036] The following is a clear and complete description of the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0037] Example 1

[0038] As shown in Figures 1 and 2, an embodiment of the present invention provides a pickling system that can prevent hydrogen accumulation, including a pickling tank 1. The top of the pickling tank 1 is provided with multiple acid mist exhaust ports 13, each of the acid mist exhaust ports 13 is connected to an acid mist discharge pipe 14, each of the acid mist discharge pipes 14 is connected to an acid mist purification pipe 15, and the acid mist purification pipe 15 is connected to an acid mist purification mechanism; auxiliary gas nozzles 16 are provided at the inlet and outlet of the pickling tank 1.

[0039] The pickling tank 1 comprises an acid 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 an arc-shaped single-layer structure.

[0040] Preferably, a plurality of side nozzles 12 are provided on the side wall of the acid tank body for spraying acid into the pickling tank 1; accordingly, 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 respectively, and the acid return pipe is connected to the acid overflow port on the acid tank body, so as to realize the circulation of the acid; an acid pump and a heat exchanger are generally arranged on the above-mentioned acid supply pipeline.

[0041] Among them, each acid mist exhaust port 13 is preferably distributed into multiple exhaust port groups, each exhaust port group is arranged in sequence along the running direction of the strip steel, and each exhaust port group includes multiple acid mist exhaust ports 13 arranged in sequence along the width direction of the pickling tank 1.

[0042] In one embodiment, as shown in Figures 1 and 2 , the pickling tank 1 is equipped with sealed doors 11 at both the entrance and exit, each housing a sandwich sprayer. The sealed doors 11 preferably have a multi-layered maze structure. This seal achieves a multi-layered sealing effect, combining mechanical and spray seals, reducing the risk of acid mist escape. The sandwich sprayer includes, but is not limited to, using desalted water as the spray medium.

[0043] The auxiliary gas nozzles 16 are preferably arranged near the sealing door 11 on the corresponding side. The auxiliary gas nozzles 16 are connected to an auxiliary gas source through an auxiliary gas supply pipe. In one embodiment, the auxiliary gas is compressed air.

[0044] In one embodiment, a hydrogen concentration detector is installed on the tank cover of the pickling tank 1, each of the acid mist discharge pipes 14, and at least one of the acid mist purification pipes 15, so as to detect the hydrogen concentration in the acid mist in real time. Preferably, a hydrogen concentration detector is installed on the tank cover of the pickling tank 1 (generally on the inner wall of the tank cover), in each of the acid mist discharge pipes 14, and in the acid mist purification pipe 15.

[0045] In one embodiment, an exhaust fan is provided at at least one of each of the acid mist exhaust ports 13, each of the acid mist discharge pipes 14, and the acid mist purification pipe 15. Preferably, an exhaust fan is provided at each of the acid mist exhaust ports 13, each of the acid mist discharge pipes 14, and the acid mist purification pipe 15. In particular, a duct fan is installed at each of the acid mist exhaust ports 13 and each of the acid mist discharge pipes 14, so that the gas in the tank can be quickly extracted.

[0046] In one embodiment, the pickling system further includes a central control system, to which each of the hydrogen concentration detectors is connected. The central control system is configured to execute an acid mist control strategy based on detection signals from each of the hydrogen concentration detectors and / or 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.

[0047] In one embodiment, as shown in FIG2 , the acid mist purification mechanism includes an acid mist condenser 31 and a washing tower 32 connected in sequence.

[0048] Example 2

[0049] An embodiment of the present invention provides a production control method for the pickling system provided in the first embodiment above, the method comprising:

[0050] Under normal production conditions, the acid mist in the pickling tank 1 is exhausted through the acid mist exhaust ports 13 to the acid mist purification mechanism for purification;

[0051] In emergency conditions, auxiliary gas is sprayed into the pickling tank 1 through the auxiliary gas nozzle 16, so that the normal exhaust mode of acid mist is switched to the blast mode of acid mist exhaust, so as to quickly exhaust the acid mist and hydrogen accumulated in the tank.

[0052] Preferably, the method further comprises:

[0053] By detecting the hydrogen concentration in the acid mist and / or predicting it through an acid mist concentration prediction model, it is determined whether the system should operate in normal production conditions or emergency conditions.

[0054] The method for detecting the hydrogen concentration in the acid mist can be implemented according to the arrangement structure of the hydrogen concentration detector in the above-mentioned embodiment 1. In particular, based on the hydrogen concentration monitoring and early warning software, the system safety can be determined based on the data detected by each hydrogen concentration detector. If it is unsafe, an alarm is issued and an emergency production mode is triggered.

[0055] As for the prediction method of the acid mist concentration prediction model, preferably, an acid mist concentration prediction model is established by collecting parameters such as the acid liquid temperature, acid pump pressure, acid liquid concentration data and hydrogen concentration in the acid mist in actual production; then, based on the established acid mist concentration prediction model, the acid liquid temperature, acid pump pressure and acid liquid concentration data are collected in real time to obtain a predicted value of the hydrogen concentration in the acid mist, and whether the system is safe is judged according to the predicted value of the hydrogen concentration in the acid mist. If it is not safe, an alarm is issued and an emergency production mode is triggered.

[0056] The above acid mist concentration prediction model is specifically expressed as: y=f(aT b P c C d )

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

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

[0059] Preferably, the above two methods are used for judgment at the same time, and when the hydrogen concentration in the acid mist obtained by any method exceeds the set threshold, the emergency production mode will be triggered.

[0060] Preferably, in an emergency, all exhaust fans are turned on to increase the gas discharge rate in the pickling tank 1. In addition, in an emergency, the sealing door 11 is sealed by water spraying to create a closed environment in the pickling tank 1, further increasing the wind pressure and air volume in the tank, thereby improving the effect and efficiency of exhausting acid mist by blowing.

[0061] In the case where the acid mist purification mechanism includes an acid mist condenser 31 and a washing 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 washing tower 32;

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

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

[0065] In addition, by implementing the acid mist control strategy through online detection of hydrogen concentration and / or prediction of hydrogen concentration in acid mist, the consumption of desalted water and auxiliary gas can be effectively reduced.

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

[0067] Example 3

[0068] This embodiment optimizes the above embodiment 1. 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 operating stability and reliability of the pickling system and reduce the downtime and frequency of desilting.

[0069] As shown in Figures 3 and 4, the iron sludge processing subsystem includes an intermediate medium circulation mechanism and an iron sludge recovery mechanism. The intermediate medium circulation mechanism includes a number of 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 reflux 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 reflux 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 steel balls for entraining iron sludge, which facilitates the removal of iron sludge from the bottom of the acid tank 2. Iron sludge at the bottom of the acid tank 2 is entrained by the cascading flow of steel balls and carried out of the acid tank 2 via the medium conveying unit 331. The surface roughness of the steel balls is designed to enhance the entrainment of iron sludge. In one embodiment, the surface roughness of the steel balls is Ra ≥ 0.8 μm, and more preferably, Ra ≤ 12 μm.

[0071] In one embodiment, as shown in FIG3 , a slope is provided at the bottom of the acid tank 2 , and the slope slopes from the intermediate medium inlet to the intermediate medium outlet, so as to facilitate the circulation of the intermediate medium 330 in the acid tank 2 . For example, the medium steel balls can rely on gravity to move from the intermediate medium inlet to the intermediate medium outlet, and the medium steel balls at a higher position exert an extrusion and driving effect on the medium steel balls at a lower position and the iron mud on the slope. Based on the circulation of the medium steel balls, the bottom of the acid tank 2 is ensured to be in motion at all times, which can reduce the accumulation of iron mud and thus save the intervention of power equipment. At the same time, the design of the slope is also conducive to the deposition of iron mud at the intermediate medium outlet, thereby facilitating the intermediate medium 330 to bring the iron mud out.

[0072] In one embodiment, the medium conveying unit 331 adopts a screw pump or a screw conveyor. According to the relative position relationship between the intermediate medium outlet and the medium transfer unit 332, the screw pump or the screw conveyor can be arranged tilted or horizontally.

[0073] In one embodiment, as shown in FIG3 and FIG4 , the medium transfer unit 332 is a chain conveying unit, such as a chain plate conveyor or a drag chain conveyor. Accordingly, the medium transfer unit 332 includes an upper chain layer 3321 and a lower chain layer 3322 .

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

[0075] Among them, the medium conveying unit 331 is connected with the upper chain layer 3321. For example, the medium output port of the medium conveying unit 331 is located directly above the upper chain layer 3321, and the intermediate medium 330 can be conveyed to the upper chain layer 3321; optionally, a hopper is arranged above the upper chain layer 3321, and the intermediate medium 330 output by the medium conveying unit 331 is received by the hopper and transferred to the upper chain layer 3321, which can avoid the intermediate medium 330 from popping out of the upper chain layer 3321 due to excessive falling distance.

[0076] The medium return unit 333 is arranged at the outlet side of the chain conveyor unit. Optionally, the medium return unit 333 uses a conveyor roller to transport the cleaned intermediate medium 330 back to the acid tank 2.

[0077] The flushing unit is used to flush the intermediate medium 330 on the medium transfer unit 332, thereby separating the iron sludge from the intermediate medium 330. In one embodiment, as shown in FIG4 , the flushing unit includes a flushing pipe 351 , at least one set of spray structures may be arranged at the bottom of the flushing pipe 351 . When there are multiple sets of spray structures, the spray structures are 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, the nozzles in the spray structures are preferably arranged sequentially along the width direction of the medium transfer unit 332 .

[0078] Furthermore, as shown in FIG4 , the flushing unit further includes a flushing liquid supply pipe 352 connected to the flushing pipe 351 for supplying flushing liquid. Preferably, surface water from the acid tank 2 is used as the flushing liquid, and accordingly, the flushing liquid supply pipe 352 is connected to the upper portion of the acid tank 2.

[0079] The flushing liquid can exit through both sides of the medium transfer unit 332, and / or the medium transfer unit 332 is a hollow conveying device, for example, it can exit through the gap between the chain plates of the chain conveyor unit. In one embodiment, as shown in Figures 3 and 5, the iron sludge recovery mechanism also includes a drainage unit 322, which is arranged between the upper chain layer 3321 and the lower chain layer 3322 of the medium transfer unit 332. The top inlet of the drainage unit 322 is located directly below the flushing unit, and the bottom outlet of the drainage unit 322 is located directly above the iron sludge collection box 321. Based on this design, the flushing liquid can be reliably drained into the iron sludge collection box 321, making the on-site environment cleaner. At the same time, it prevents flushing water carrying iron sludge from contaminating the lower chain layer 3322, thereby improving the working reliability of the medium transfer unit 332 and reducing its maintenance frequency.

[0080] Preferably, as shown in Figures 3 and 5, the drainage unit 322 is in 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 on the one hand, and on the other hand, it is also convenient for 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 may be arranged in the drainage inlet pipe, so as to better capture the intermediate medium 330 and iron mud splashed by the high-pressure jet.

[0082] Preferably, as shown in Figure 5, the above-mentioned drainage unit 322 is connected to the iron mud collection box 321 to form an integrated structure. For example, for the above-mentioned inverted Y-shaped drainage unit 322, its outer frame 3221 is integrally formed with the iron mud collection box 321 to form a top-closed box body, and an inverted V-shaped mudguard 3222 is arranged in the box body, which correspondingly constitutes the inner frame of the drainage unit 322.

[0083] In one embodiment, a protective net 323 is further arranged around the upper chain layer 3321 of the medium transfer unit 332. The protective area of ​​the protective net 323 at least covers the flushing area of ​​the upper chain layer 3321. The provision of the protective net 323 can prevent the high-pressure jet from spraying the intermediate medium 330 out of the medium transfer unit 332.

[0084] Among them, the protective net 323 can provide side protection. Optionally, the protective net 323 includes two side mesh panels 3231, and the two side mesh panels 3231 are arranged on both sides of the conveying channel of the medium transfer unit 332; the side mesh panels 3231 preferably do not move together with the medium transfer unit 332, for example, they are installed through mesh panel brackets. For the above-mentioned solution with a drainage unit 322, the side mesh panels 3231 can also be installed on the outer frame 3221 of the drainage unit 322.

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

[0086] The iron sludge processing subsystem is further optimized. As shown in FIG3 and FIG4 , the iron sludge recovery mechanism further includes a filtering unit, and the iron sludge collection box 321 is provided with a flushing liquid recovery pipe connected to the filtering unit.

[0087] Alternatively, the filtrate produced by the filter unit can be used as a flushing liquid again. For example, the filtrate outlet pipe of the filter unit is connected to a flushing liquid storage tank, and the flushing liquid supply pipe 352 is also connected to the flushing liquid storage tank. When the flushing liquid is the surface water of the acid tank 2, the filtrate produced by the filter unit can flow back into the acid tank 2. Accordingly, the filtrate outlet pipe of the filter unit is connected to the acid tank 2.

[0088] The iron sludge collection box 321 can control the direction of the flushing liquid by overflowing, and the flushing liquid recovery pipe is connected to the overflow level of the iron sludge collection box 321. Heavier impurities are deposited at the bottom of the iron sludge collection box 321 and can be cleaned regularly or irregularly.

[0089] In one embodiment, the filtering unit includes an electromagnetic filter 100 for removing ferromagnetic impurities in the flushing liquid, which can reliably adsorb and remove the ferromagnetic impurities suspended in the flushing liquid.

[0090] Example 4

[0091] This embodiment provides an electromagnetic filter 100 that can be used in the above-mentioned third embodiment.

[0092] As shown in Figures 6 to 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 bracket 1021, multiple electromagnetic suction cups 1022 and an electronic control unit for controlling the power supply and loss of each electromagnetic suction cup 1022. Each electromagnetic suction cup 1022 is installed on the annular bracket 1021 and is distributed in an annular shape along the circumference of the annular bracket 1021. The annular bracket 1021 is equipped with a rotating drive mechanism 105 for driving the rotation thereof; the annular bracket 1021 is partially located in the filter tank 101, and the impurity collector 103 is arranged outside the filter tank 101 and includes an impurity removal portion for driving impurities away from the electromagnetic suction cup 1022.

[0093] In one embodiment, the above-mentioned annular bracket 1021 includes an inner ring frame and an outer ring frame, and the inner ring frame and the outer ring frame 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 installed with an electromagnetic suction cup 1022.

[0094] Optionally, as shown in FIG6 , the spokes are distributed along the radial direction of the annular support 1021 , and the inner ring frame-spoke-outer ring frame are connected to form a hub shape.

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

[0096] The disk surface of the electromagnetic suction cup 1022 is preferably coplanar with the corresponding side surface of the annular bracket 1021. This not only facilitates the removal of impurities on the electromagnetic suction cup 1022, but also prevents the formation of some corners between the electromagnetic suction cup 1022 and the annular bracket 1021, which may cause dirt to accumulate.

[0097] Preferably, the annular bracket 1021 is connected to the rotation drive mechanism 105 via the bracket shaft 104 , and the rotation drive mechanism 105 drives the bracket shaft 104 to rotate, thereby driving the annular bracket 1021 and the electromagnetic suction cup 1022 on the annular bracket 1021 to rotate.

[0098] In one embodiment, the above-mentioned rotation drive mechanism 105 adopts a motor + transmission component structure, and the transmission component can be a sprocket drive, a pulley drive, etc.; the motor is preferably a variable frequency motor, which can control the rotation speed of the annular bracket 1021.

[0099] Preferably, the electric control unit includes a plurality of electric control cables and an electric control module. The number of the electric control cables is the same as the number of the electromagnetic suction cups 1022 and they are connected one-to-one. Each of the electric control cables is electrically connected to the electric control module.

[0100] In one embodiment, the support shaft 104 is a hollow shaft, and each of the electrical cables is routed through the hollow cavity of the support shaft 104. This approach facilitates the routing of the electrical cables and provides increased safety and reliability. Preferably, a wiring hole is provided in the annular support 1021 (e.g., an inner ring frame) to facilitate the entry of the electrical cables into the support shaft 104; a wiring channel is also provided in the electromagnetic chuck 1022 to connect the electrical cables to the coil within 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 designed in sections, with the annular bracket 1021 clamped between two shaft segments 1041 of the bracket shaft 104 (generally, the inner ring bracket is clamped between the two shaft segments 1041 of the bracket shaft 104); optionally, a shaft shoulder is machined on the shaft segment 1041, and both ends of the inner hole of the inner ring bracket adopt a stepped hole structure. The shaft neck portion of the shaft segment 1041 is inserted into the large-diameter hole segment of the corresponding side stepped hole structure, and the shaft shoulder of the shaft segment 1041 abuts against the corresponding side end face of the inner ring bracket, and the two are fixed by screws.

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

[0103] In one embodiment, the electronic control module includes a central controller and conductive slip rings. Each of the electronic control cables is connected to the rotor portion of the conductive slip rings, and the central controller is connected to the stator portion of the conductive slip rings. The rotor portion of the conductive slip rings is preferably mounted on the bracket shaft 104. This structure ensures reliable control of the power supply and loss of each electromagnetic chuck 1022 while the electromagnetic chuck 1022 rotates normally.

[0104] The above-mentioned central controller includes but is not limited to a PLC controller.

[0105] When the annular bracket 1021 drives each electromagnetic suction cup 1022 to rotate, some electromagnetic suction cups 1022 are immersed in the filter tank 101 from outside the filter tank 101, and some electromagnetic suction cups 1022 leave the filter tank 101 and swing upward; for the electromagnetic suction cups 1022 that swing upward, ferromagnetic impurities are adsorbed on their surfaces, and the liquid that is carried up and the liquid in the adsorbed impurities can leave the electromagnetic suction cups 1022 under the action of gravity, so that the effect of gravity dehydration can be achieved. The impurities collected in the impurity collector 103 have a low water content, which not only facilitates the subsequent treatment of the impurities, but also reduces the loss of liquid in the filter tank 101.

[0106] In one embodiment, as shown in Figures 7 and 8, the filter disc 102 further includes a water retaining ring 1023, which is coaxially mounted on the support shaft 104 and abuts against the surface of each electromagnetic suction cup 1022. An annular water retaining edge is protruded from the outer ring wall of the water retaining ring 1023, and the annular water retaining edge and the electromagnetic suction cup 1022 form a water retaining groove. The provision of the water retaining ring 1023 can effectively guide the liquid, preventing it from entering places such as the support shaft 104 and affecting the normal operation of the electronic control unit.

[0107] Preferably, there are two water retaining rings 1023 and they are arranged on both sides of the annular bracket 1021.

[0108] Preferably, a sealing gasket can be sandwiched between the water retaining ring 1023 and the electromagnetic suction cup 1022 to improve the water retaining effect.

[0109] At the impurity collection station, impurities on the surface of the electromagnetic chuck 1022 may be scraped off, or the surface of the electromagnetic chuck 1022 may be flushed with high-pressure water or high-pressure gas.

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

[0111] Generally, both sides of the electromagnetic suction cup 1022 can absorb impurities. Therefore, it is preferred to set a scraper 1031 and an impurity collection groove 1032 on both sides of the annular bracket 1021 respectively; the distance between the working ends of the scrapers 1031 on both sides is preferably the same as the thickness of the electromagnetic suction cup 1022.

[0112] Preferably, as shown in FIG. 7 and FIG. 8 , the scraper blade 1031 is arranged at an angle to facilitate the scraped impurities to fall into the impurity collecting trough 1032 .

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

[0114] Preferably, the scraper 1031 adopts a grooved plate, and the length direction of the scraper 1031 is defined as the direction from its working end to the impurity collection groove 1032. Wing plates are extended from the two lateral ends of the scraper 1031 to better restrain and guide the scraped impurities.

[0115] As a preferred solution of this embodiment, as shown in Figures 7 and 8, there are multiple groups of filter discs 102, and each of the annular brackets 1021 is sequentially mounted on the same bracket shaft 104, and the bracket shaft 104 is connected to the rotation drive mechanism 105. Providing multiple groups of filter discs 102 can improve filtration efficiency and filtration effect.

[0116] As shown in FIG. 7 , two adjacent filter discs 102 may share a common impurity collection slot 1032 .

[0117] Preferably, as shown in FIG7 , a plurality of partitions are provided in the filter tank 101 , each partition dividing the filter tank 101 into a plurality of liquid storage tanks 1011 , preferably each liquid storage tank 1011 is respectively provided with a filter disc 102 ; wherein, the number of filter discs 102 and liquid storage tanks 1011 is preferably the same and they are arranged in one-to-one correspondence.

[0118] In one embodiment, upstream sewage can be allowed to enter each liquid storage tank 1011 at the same time.

[0119] In another embodiment, the liquid storage tanks 1011 can be connected in series, with upstream sewage first entering the first liquid storage tank 1011. The sewage then overflows between the upstream and downstream liquid storage tanks 1011. This allows for streamlined sewage treatment, enabling continuous treatment and ensuring treatment effectiveness and efficiency. As shown in Figure 7, in the first liquid storage tank 1011, the filter disc 102 is preferably positioned near the sewage inlet to immediately capture ferromagnetic impurities in the sewage and improve electromagnetic filtration effectiveness. In the tail liquid storage tank 1011, the filter disc 102 is preferably positioned near the filtrate outlet to improve the cleanliness of the discharged filtrate.

[0120] In particular, based on the segmented design of the bracket shaft 104 mentioned above, the installation and arrangement of each filter disc 102 can be facilitated; the number of filter discs 102 can be increased or decreased as needed, so the flexibility is very high; and it can facilitate equipment maintenance, for example, the filter disc 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 includes:

[0122] The electromagnetic chucks 1022 are driven to rotate by the annular bracket 1021, so that the electromagnetic chucks 1022 can move cyclically 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 absorb ferromagnetic impurities in the filter tank 101;

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

[0125] In the impurity removal position, the electromagnetic chuck 1022 loses power, and the impurities are driven away from the electromagnetic chuck 1022 by the impurity removal unit and collected.

[0126] Example 5

[0127] This embodiment of the present invention further optimizes the first embodiment.

[0128] As shown in Figures 9 to 12, the pickling system also includes:

[0129] Pickling quality quantitative evaluation module, used to obtain pickling quality and feed it back to PLC;

[0130] PLC, used to receive the pickling quality feedback from the pickling quality quantitative evaluation module and calculate the torque of the motor based on it;

[0131] An electric motor, used to adjust the speed of the steel strip according to the torque, for example, to accelerate or decelerate the steel strip according to actual conditions;

[0132] The PC is used to adjust the relevant parameters of the PLC through the neural network model based on the pickling quality feedback from the pickling quality quantitative evaluation module and the preset pickling quality, and send them to the PLC to achieve pickling adjustment.

[0133] In practical applications, after mechanical descaling and surface heating, the steel strip enters the pickling tank, undergoes multi-stage rinsing, and then undergoes hot air drying and coiling. An image data acquisition module, a visualization module, and a pickling quality quantitative evaluation module are installed after mechanical descaling and pickling. During the pickling process, the image data acquisition module (e.g., a camera) collects strip image data and visualizes it using the visualization module. The pickling quality quantitative evaluation module then evaluates and scores the strip cleaning quality. Furthermore, the system features a neural network self-learning feedback control function. After multiple training cycles, the pickling system can quantitatively adjust the pickling quality of the strip.

[0134] In this embodiment, feedback control is implemented based on a quantitative pickling quality evaluation module, achieving a high degree of digitization and enabling quantitative adjustment. This embodiment achieves shorter strip speed control response times than traditional PID control, better real-time performance, and less overshoot. Furthermore, PID controller parameters can be adjusted based on operating conditions, achieving optimal control results.

[0135] In one embodiment, the training samples of the neural network model on the PC are collected from the PLC, and the samples include r(k), y(k), K p , K I and K D , where r(k) is the preset pickling quality at the kth iteration, y(k) is the pickling quality fed back by the pickling quality quantitative evaluation module at the kth iteration, K p , K I , K D are the adjustable parameters P, I, and D of the PLC’s PID controller, as shown in Figure 11.

[0136] In another embodiment, the PC collects training samples through OPC Client communicating with OPC Server, and OPC Server communicating with PLC. After obtaining the samples, the samples are stored in a database of the PC for training the neural network model.

[0137] Furthermore, the neural network model is trained and learned using the BP algorithm, wherein the performance indicator function is:

[0138] Among them, r(k) is the preset pickling quality at the kth iteration, and y(k) is the pickling quality feedback from the pickling quality quantitative evaluation module at the kth iteration.

[0139] Preferably, the number of neurons in the input layer, hidden layer and output layer of the neural network model are 2, 6 and 3 respectively.

[0140] 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 a different weighting coefficient that can be continuously adjusted and updated.

[0141] On the one hand, the activation function of the hidden layer is:

[0142] The hidden layer may also use other activation functions.

[0143] On the other hand, the activation function of the output layer is:

[0144] The output layer may also use other activation functions.

[0145] In one embodiment, the weighted coefficients of the neural network model are adjusted and updated using a gradient descent method.

[0146] Furthermore, the step of adjusting and updating the weighted coefficients of the neural network model using the gradient descent method specifically includes:

[0147] S1. Initialize the weighted coefficients of each layer of the neural network model, and set the number of iterations of the neural network model k = 1;

[0148] S2. Calculate the error between the input value and the output value of the input layer. If the error is less than the first threshold, execute S3; otherwise, optimize the input value and the output value of the input layer so that the error is less than the first threshold.

[0149] 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;

[0150] S4. The output value of the PID controller is calculated based on the adjustable parameters of the PLC PID controller;

[0151] S5. Perform neural network model learning and adjust weighting coefficients to achieve adaptive adjustment of adjustable parameters of the PID controller;

[0152] S6. If the adjustable parameter of the PID controller is greater than the second threshold, the neural network model training is completed; otherwise, the neural network model iteration number k=k+1 is set, and the process returns to S2.

[0153] As shown in Figure 12, with the sampling period set to 1 second, the pickling system calls the neural network model every 1 second. Once the neural network model is trained, the pickling system can effectively control the acid quality. When encountering disturbances or parameter changes, the pickling system quickly readjusts the parameter values ​​to achieve optimal control results.

[0154] Based on the same inventive concept, the embodiment of the present invention is also used to optimize the second embodiment.

[0155] The production control method of the pickling system also includes:

[0156] Pickling quality quantitative evaluation module pickling quality and feedback to PLC;

[0157] The PLC receives the pickling quality feedback from the pickling quality quantitative evaluation module and calculates the torque of the motor based on it;

[0158] The motor adjusts the speed of the strip according to the torque;

[0159] 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 the neural network model and sends them to the PLC to achieve pickling adjustment.

[0160] The embodiments of the production control method and the embodiments of the aforementioned pickling system can be implemented one by one and will not be described in detail here.

[0161] The embodiments of the present invention can accelerate the cleaning speed, reduce energy consumption and acid consumption, and thus obtain a steel strip with high surface cleaning quality.

[0162] 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 in the scope of protection of the present invention.

Claims

1. A pickling system capable of preventing hydrogen accumulation, comprising a pickling tank, characterized in that: The top of the pickling tank is provided with a plurality of acid mist exhaust ports, each of which is connected to an acid mist discharge pipe, each of which is connected to an acid mist purification pipe, and the acid mist purification pipe is connected to an acid mist purification mechanism; auxiliary gas nozzles are provided at the inlet and outlet of the pickling tank.

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

3. The pickling system according to claim 2, characterized in that: It also includes a central control system, and 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 of each of the hydrogen concentration detectors and / or the predictions of the acid mist concentration prediction model.

4. The pickling system according to claim 1, characterized in that: An exhaust fan is provided at at least one of the acid mist exhaust ports, the acid mist discharge pipes and the acid mist purification pipe.

5. The pickling system according to claim 1, characterized in that: The acid mist purification mechanism comprises an acid mist condenser and a washing tower which are connected in sequence.

6. The pickling system according to claim 1, characterized in that: The inlet and outlet of the pickling tank are both provided with sealed doors, and an interlayer sprayer is arranged inside the sealed door.

7. The production control method of the pickling system according to any one of claims 1 to 6, characterized in that: The method comprises: Under normal production conditions, the acid mist in the pickling tank is exhausted through the acid mist exhaust ports to the acid mist purification mechanism for purification; Under emergency conditions, auxiliary gas is sprayed into the pickling tank through the auxiliary gas nozzle, so that the normal exhaust mode of acid mist is switched to the blast mode of acid mist, so as to quickly exhaust the acid mist and hydrogen accumulated in the tank.

8. The production control method according to claim 7, characterized in that: The method further comprises: By detecting the hydrogen concentration in the acid mist and / or predicting it through an acid mist concentration prediction model, Determine whether the system should operate under normal production conditions or emergency conditions.

9. The production control method according to claim 7, characterized in that: The acid mist purification mechanism comprises an acid mist condenser and a washing tower connected in sequence; The method further comprises: 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; Under emergency conditions, chilled water is introduced into the acid mist condenser as a cooling medium, and alkaline solution is sprayed into the washing tower.

10. The production control method according to claim 7, characterized in that: The auxiliary gas is compressed air.

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