Inductive hydrogen-controlled strip pickling system and its use method

Abstract

The present invention relates to an induction-type hydrogen-controlled steel strip pickling system and a method for using the same. The steel strip pickling system comprises a pickling tank, wherein an inductor is provided on the pickling tank, wherein the inductor has an air inlet, an air supply port, and an air return port. The air inlet is connected to an air supply pipe, and both the air supply port and the air return port are connected to the tank cavity of the pickling tank. The steel strip pickling system provided by the present invention, by providing an inductor, extracts the gas in the pickling tank and then sends it back into the tank. On the one hand, the distribution of the gas in the tank can be changed, the fluidity of the gas in the tank can be improved, and hydrogen enrichment can be prevented. On the other hand, the atmosphere in the tank can be diluted, thereby reducing the possibility of hydrogen combustion and hydrogen explosion in the tank, effectively improving production safety.

Description

Technical Field

[0001] The invention belongs to the technical field of strip steel pickling, and particularly relates to an inductive hydrogen-controlled strip steel pickling system and a use method thereof. Background Art

[0002] Pickling steel strips removes iron oxide scale from the strip's surface, leaving it with a clean, smooth surface and improving its surface quality. In the pickling tank, the strip and the acid undergo a vigorous chemical reaction. The highly turbulent, high-temperature, and highly concentrated hydrochloric acid reacts with the iron oxide on the strip's surface, removing the scale. However, if the pickling process is excessive, the hydrochloric acid will further react with the metallic iron beneath the scale, generating hydrogen.

[0003] Hydrogen is a common gaseous product in pickling tanks. Low-concentration hydrogen poses no threat if it can be promptly discharged from the tank. However, since the exhaust vents are typically located on the sides of the tank, low-density hydrogen often accumulates at the top of the tank. The exhaust system's ability to extract hydrogen is limited, leading to a significant accumulation of hydrogen at the top of the tank and in areas beyond the reach of the exhaust system. As hydrogen concentration increases, the likelihood of a hydrogen explosion in the pickling tank also increases. Summary of the Invention

[0004] The present invention relates to an inductive hydrogen-controlled steel strip pickling system and a method for using the same, which can at least solve some of the defects of the prior art.

[0005] The present invention relates to an induction-type hydrogen-controlled strip pickling system, comprising a pickling tank, wherein at least one inductor is provided on the pickling tank, the inductor having an air inlet, an air supply port and an air return port, the air inlet being connected to an air supply pipe, the air supply port and the return air port being both connected to the tank cavity of the pickling tank, and the return air ports of at least some of the inductors being arranged corresponding to the hydrogen-enriched area of ​​the pickling tank.

[0006] As one of the implementation modes, a first adsorbent layer is provided in the return air duct of the inducer.

[0007] As one of the implementation modes, the first adsorbent layer uses SDG adsorbent or activated carbon adsorbent.

[0008] As one of the implementation modes, a second adsorbent layer is further provided in the return air duct of the inducer, and the second adsorbent layer is located downstream of the first adsorbent layer.

[0009] As one of the embodiments, the second adsorbent layer uses an adsorbent that can adsorb hydrogen.

[0010] As one of the embodiments, a third adsorbent layer is provided in the air supply passage of the inducer.

[0011] As one of the implementation modes, the third adsorbent layer uses an adsorbent that can adsorb hydrogen.

[0012] As one of the embodiments, the air supply jet output from the air supply port is directed toward the hydrogen-enriched area, so as to drive the hydrogen in the tank to the exhaust port of the pickling tank; and / or, the air supply jet output from the air supply port is directed toward the surrounding area of ​​the hydrogen-enriched area, so as to form a negative pressure suction effect on the hydrogen-enriched area.

[0013] As one of the implementation modes, the gas supply pipeline supplies inert gas.

[0014] The present invention also relates to a method for using the above-mentioned inductive hydrogen-controlled strip pickling system, comprising:

[0015] The hydrogen concentration in the pickling tank is detected. When the hydrogen concentration in the tank reaches a set threshold, the inductor works to reduce the hydrogen concentration in the tank.

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

[0017] The strip steel pickling system provided by the present invention, by arranging an inductor, extracts the gas in the pickling tank and then sends it into the tank. On the one hand, it can change the gas distribution in the tank, improve the gas fluidity in the tank, and prevent hydrogen enrichment. On the other hand, it can also dilute the atmosphere in the tank, thereby reducing the possibility of hydrogen combustion and hydrogen explosion in the tank, and effectively improving production safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] 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.

[0019] Figure 1 A schematic structural diagram of an inductive hydrogen-controlled strip pickling system provided in an embodiment of the present invention;

[0020] Figure 2 A schematic structural diagram of an inducer provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0021] 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.

[0022] like Figure 1 and Figure 2 An embodiment of the present invention provides an induction-type hydrogen-controlled strip pickling system, comprising a pickling tank 1, wherein the pickling tank 1 is provided with at least one inductor 2, wherein the inductor 2 has an air inlet, an air supply port and a return air port, wherein the air inlet is connected to an air supply pipe 21, and the air supply port and the return air port are both connected to the tank cavity of the pickling tank 1, and the return air ports of at least some of the inductors 2 are arranged corresponding to the hydrogen-enriched area of ​​the pickling tank 1.

[0023] Preferably, the inductor 2 is arranged on the top of the pickling tank 1 .

[0024] Preferably, multiple inductors 2 are arranged to improve the control effect and efficiency of the hydrogen concentration in the tank. Preferably, at least some of the inductors 2 are arranged in the hydrogen-enriched area of ​​the pickling tank 1, for example, opening at the top of the tank in the hydrogen-enriched area and docking with the return air port of the inductor 2, or connecting through a return air duct.

[0025] Preferably, the pickling tank 1 is provided with an exhaust port, which is connected to the acid mist suction mechanism 3. Optionally, the exhaust port is provided on the side of the pickling tank 1. In one embodiment, Figure 1 The acid mist suction mechanism 3 includes an acid mist collection pipe and a washing tower 31 and a centrifugal fan arranged on the acid mist collection pipe. Demisting is performed through the spray mechanism in the washing tower 31, and the acid liquid can be recovered at the same time.

[0026] The strip pickling system provided in this embodiment, by setting an inducer 2, extracts the gas in the pickling tank 1 and then sends it into the tank. On the one hand, it can change the gas distribution in the tank, improve the gas fluidity in the tank, and prevent hydrogen enrichment. On the other hand, it can also dilute the atmosphere in the tank, thereby reducing the possibility of hydrogen combustion and hydrogen explosion in the tank, and effectively improving production safety.

[0027] In one embodiment, the gas supply pipe 21 supplies an inert gas to dilute the atmosphere in the tank and prevent hydrogen explosion. The inert gas includes but is not limited to nitrogen.

[0028] In one embodiment, the air supply jet outputted from the air supply port adopts at least one of the following forms:

[0029] (1) The air supply jet is directed toward the hydrogen-rich area to drive the hydrogen in the tank to the exhaust port of the pickling tank 1, thereby increasing the mobility of the hydrogen and making it easier for the hydrogen to be discharged out of the tank;

[0030] (2) The air supply jet is directed toward the periphery of the hydrogen-enriched area, and is used to form a negative pressure suction effect on the hydrogen-enriched area. The negative pressure effect generated by the jet can suck the hydrogen in the hydrogen-enriched area and increase the mobility of the hydrogen;

[0031] It can be seen that in this embodiment, the air supply power of the inducer 2 can further achieve the hydrogen control effect, and at the same time can save the exhaust energy consumption of the pickling tank 1.

[0032] Preferably, the air supply port should be staggered with the air exhaust port to avoid airflow short-circuiting. The air supply jet is preferably staggered with the return air port.

[0033] In one embodiment, Figure 2 A first adsorbent layer 24 is provided in the return air channel 22 of the inductor 2. Preferably, the first adsorbent layer 24 is mainly used to absorb acid mist in the return air. For example, the first adsorbent layer 24 uses SDG adsorbent or activated carbon adsorbent.

[0034] Among them, there can be multiple return air ports / return air channels 22 in the inducer 2, which can increase the processing capacity.

[0035] In one embodiment, Figure 2 A second adsorbent layer 25 is also provided in the return air channel 22 of the inducer 2. The second adsorbent layer 25 is located downstream of the first adsorbent layer 24, that is, the second adsorbent layer 25 is located on the side of the first adsorbent layer 24 away from the return air outlet. The return air is processed by the first adsorbent layer 24 and the second adsorbent layer 25 in sequence.

[0036] In one embodiment, the second adsorbent layer 25 uses an adsorbent that can adsorb hydrogen, including but not limited to high specific surface area activated carbon or carbon nanotubes.

[0037] Based on the above scheme, hydrogen adsorption is achieved in inductor 2. The low hydrogen concentration in the supply air jet effectively reduces the hydrogen concentration within the tank, significantly controlling hydrogen. Return air first passes through first adsorbent layer 24 to absorb the acid mist before entering second adsorbent layer 25 for hydrogen adsorption. This process is highly rational, ensuring effective hydrogen adsorption and reducing the load on second adsorbent layer 25.

[0038] In one embodiment, Figure 2 A third adsorbent layer 26 is provided in the air supply duct 23 of the inductor 2. Preferably, the third adsorbent layer 26 utilizes an adsorbent capable of adsorbing hydrogen, including but not limited to high-surface-area activated carbon or carbon nanotubes. Hydrogen adsorption can also be achieved through the third adsorbent layer 26. In particular, when both the second adsorbent layer 25 and the third adsorbent layer 26 are provided within the inductor 2, the hydrogen adsorption effect can be further enhanced.

[0039] In one embodiment, Figure 2The induction device 2 includes a static pressure box 27 and an induction box 28. The air supply pipe 21 is connected to the static pressure box 27. An air inlet nozzle is provided on the outlet side of the static pressure box 27. This air inlet nozzle faces into the induction box 28 and is used to input the air jet into the induction box 28 to create a negative pressure. The return air inlet and air supply inlet are both provided on the induction box 28. An air supply nozzle is provided on the outlet side of the induction box 28. This air inlet nozzle faces into the pickling tank 1 and is used to input the air jet into the pickling tank 1.

[0040] Among them, preferably, the spray angle of the air supply nozzle is adjustable, which can improve process flexibility.

[0041] In one embodiment, Figure 1 The pickling tank 1 is equipped with a hydrogen concentration detection unit 4 for detecting the hydrogen concentration in the tank. An induction control valve 211 is provided on the gas supply pipe 21. The hydrogen concentration detection unit 4 is preferably interlocked with the induction control valve 211 to facilitate automatic hydrogen control.

[0042] An embodiment of the present invention also provides a method for using the strip steel pickling system, comprising:

[0043] The hydrogen concentration in the pickling tank 1 is detected. When the hydrogen concentration in the tank reaches a set threshold, the inductor 2 works to reduce the hydrogen concentration in the tank.

[0044] In one embodiment, when the hydrogen concentration in the tank reaches a first set threshold, the inductor 2 is operated to perform a preliminary hydrogen control operation;

[0045] When the hydrogen concentration in the tank reaches the second set threshold, the acid mist is extracted through the exhaust port to quickly reduce the hydrogen concentration in the tank. During this process, the inducer 2 can work synchronously.

[0046] 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. An inductive hydrogen-controlled steel strip pickling system, comprising a pickling tank, characterized in that: The pickling tank is provided with at least one inductor, the inductor having an air inlet, an air supply port and an air return port, the air inlet is connected to an air supply pipe, the air supply port and the air return port are both in communication with the tank cavity of the pickling tank, and the air return ports of at least some of the inductors are arranged corresponding to the hydrogen enrichment area of ​​the pickling tank; The air jet outputted from the air supply port is directed toward the hydrogen-enriched area, so as to drive the hydrogen in the tank to the exhaust port of the pickling tank; and / or the air jet outputted from the air supply port is directed toward the periphery of the hydrogen-enriched area, so as to form a negative pressure suction effect on the hydrogen-enriched area; The gas supply pipeline supplies inert gas; The pickling tank is provided with an exhaust port, which is connected to an acid mist suction mechanism. The acid mist suction mechanism includes an acid mist collection pipe and a washing tower and a centrifugal fan arranged on the acid mist collection pipe. The exhaust port is provided on the side of the pickling tank and the air supply port and the exhaust port are staggered to avoid air flow short circuit.

2. The inductive hydrogen controlled strip pickling system according to claim 1, characterized in that: A first adsorbent layer is provided in the return air passage of the inducer.

3. The inductive hydrogen controlled strip pickling system according to claim 2, characterized in that: The first adsorbent layer uses SDG adsorbent or activated carbon adsorbent.

4. The inductive hydrogen controlled strip pickling system according to claim 2, characterized in that: A second adsorbent layer is further provided in the return air channel of the inducer, and the second adsorbent layer is located downstream of the first adsorbent layer.

5. The inductive hydrogen controlled strip pickling system according to claim 4, characterized in that: The second adsorbent layer uses an adsorbent that can adsorb hydrogen.

6. The inductive hydrogen controlled strip pickling system according to any one of claims 1 to 5, characterized in that: A third adsorbent layer is provided in the air supply channel of the inducer.

7. The inductive hydrogen controlled strip pickling system according to claim 6, characterized in that: The third adsorbent layer uses an adsorbent that can adsorb hydrogen.

8. The method for using the inductive hydrogen controlled strip pickling system according to any one of claims 1 to 7, characterized in that: include: The hydrogen concentration in the pickling tank is detected. When the hydrogen concentration in the tank reaches a set threshold, the inductor works to reduce the hydrogen concentration in the tank.

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