A gas collecting device for collecting waste gas from an acid washing tank

Abstract

The utility model provides a kind of gas collecting device for collecting pickling tank waste gas, including gas guide cover, several air suction components and control module, gas guide cover is located on pickling tank, several air suction components are spaced apart and located in the side of gas guide cover, air suction component includes air suction pipeline, air draught fan, densimeter, first pressure sensor and second pressure sensor, air suction pipeline is connected with gas guide cover, densimeter is located in gas guide cover, close to air suction pipeline, first pressure sensor is located in air suction pipeline, close to the end of air suction pipeline and gas guide cover connection, air draught fan is located in the end of air suction pipeline away from gas guide cover, second pressure sensor is located in air suction pipeline, close to the end of air draught fan, air draught fan, densimeter, first pressure sensor and second pressure sensor are electrically connected to control module, solve the technical problem that waste gas collecting device of pickling tank in the prior art cannot dynamically adjust the suction air volume of air draught fan in device according to real-time concentration of waste gas and real-time negative pressure in air duct.

Description

Technical Field

[0001] This utility model relates to the field of industrial waste gas treatment technology, and in particular to a gas collection device for collecting waste gas from pickling tanks. Background Technology

[0002] In the silicon steel manufacturing process, the removal of the oxide layer on the surface of the strip steel must be completed through a continuous pickling line. This process typically uses hydrochloric acid or sulfuric acid solution to chemically pickle the strip steel, which continuously releases a large amount of mixed waste gas containing acid mist (such as HCl, H2SO4, etc.), volatile organic compounds, and metal oxide particles. This type of waste gas is highly corrosive and polluting; if it is discharged directly without treatment, it will seriously endanger the safety of the production environment and cause air pollution.

[0003] Currently, the industry commonly uses gas collection devices to collect the exhaust gas escaping from above the pickling tank under negative pressure, and then transports it to the exhaust gas treatment tower for neutralization and purification through a pipeline system. However, existing gas collection devices have significant technical defects: their induced draft fans typically operate in a fixed power mode, unable to dynamically adjust the suction volume according to the real-time concentration of exhaust gas and the negative pressure within the duct. In actual operating conditions, the amount of exhaust gas generated by the pickling tank varies significantly due to changes in steel coil specifications, fluctuations in acid concentration, and production line start-up and shutdown. If the induced draft fan of the gas collection device is kept at a low airflow rate for a long period, it will lead to low exhaust gas collection efficiency and problems such as acid mist overflow and equipment corrosion during periods of concentrated exhaust gas release and high exhaust gas concentration; while keeping the induced draft fan at a high airflow rate for a long period will result in wasted energy, accelerated wear of the induced draft fan, increased maintenance costs, and reduced service life of the induced draft fan under conditions of low exhaust gas concentration. Utility Model Content

[0004] The purpose of this application is to provide a gas collection device for collecting waste gas from pickling tanks. This device addresses the technical problems in the prior art where the induced draft fan of the gas collection device typically operates at a fixed power, making it impossible to dynamically adjust the suction volume according to the real-time concentration of waste gas and the negative pressure in the duct. This results in low waste gas collection efficiency during periods of concentrated waste gas release and high waste gas concentration, leading to acid mist overflow and corrosion of equipment, or energy waste, increased wear on the induced draft fan, increased maintenance costs, and reduced service life of the induced draft fan under conditions of low waste gas concentration.

[0005] To achieve the above objectives, the embodiments of this application adopt the following technical solutions:

[0006] A gas collection device for collecting waste gas from pickling tanks, used to collect waste gas generated in pickling tanks and transport the waste gas to a waste gas treatment tower, includes a gas guide cover, several gas suction components and a control module.

[0007] The air guide cover is sealed above the pickling tank;

[0008] A plurality of the aforementioned air-suction components are spaced apart along the length of the pickling tank on one side of the air-guiding cover. Each air-suction component includes an air-suction pipe, an induced draft fan, a concentration meter, a first pressure sensor, and a second pressure sensor. The air-suction pipe is connected to the air-guiding cover. The concentration meter is disposed inside the air-guiding cover and located on one side of the air-suction pipe. The first pressure sensor is disposed inside the air-suction pipe and located at the end where the air-suction pipe connects to the air-guiding cover. The induced draft fan is disposed at the end of the air-suction pipe away from the air-guiding cover. The second pressure sensor is disposed inside the air-suction pipe near the induced draft fan.

[0009] The induced draft fan, concentration meter, first pressure sensor, and second pressure sensor are all electrically connected to the control module.

[0010] In the gas collection device for collecting waste gas from pickling tanks as described in the embodiments of this application, the gas suction pipe includes a tapered contraction pipe, a smooth transition pipe, and a gas outlet pipe;

[0011] The end of the tapered contraction tube with the larger cross-sectional area is connected to the air guide cover, and the end with the smaller cross-sectional area is connected to the smooth transition tube. The end of the smooth transition tube away from the tapered contraction tube is connected to the induced draft fan. The other end of the induced draft fan is connected to the exhaust pipe. The other ends of the plurality of exhaust pipes are all connected to the main exhaust pipe. The end of the main exhaust pipe is connected to the air inlet of the waste gas treatment tower.

[0012] In the gas collection device for collecting waste gas from pickling tanks described in this application embodiment, a filter screen is provided at one end of the conical contraction tube near the smooth transition tube.

[0013] In the gas collection device for collecting waste gas from pickling tanks described in this application embodiment, a condensation tank is provided at the bottom of the conical contraction tube, and a condensate outlet is provided at one end of the condensation tank near the gas guide cover, with an end cap provided on the condensate outlet.

[0014] In the gas collection device for collecting waste gas from pickling tanks described in this application embodiment, an observation window is provided on one side wall of the conical contraction tube.

[0015] In the gas collection device for collecting waste gas from pickling tanks described in this application embodiment, the gas guide cover, conical contraction pipe, smooth transition pipe, induced draft fan, gas outlet pipe, and main gas outlet pipe are all detachably connected by flanges.

[0016] In the gas collection device for collecting waste gas from pickling tanks described in the embodiments of this application, the gas suction pipe further includes a movable support assembly, which includes a support block, a support rod, a sliding seat, and a mounting base;

[0017] The support block is installed at the top of the support rod, and at least two arc-shaped support bars are provided on it. The end of the arc-shaped support bar away from the support block is fixedly connected to the end of the smooth transition pipe near the induced draft fan. The sliding seat is fixedly installed at the bottom of the support rod, and at least two sliding strips are provided at the end of the sliding seat away from the support rod. The mounting base is fixedly installed in the working area, and at least two sliding grooves are provided on it. The sliding strips are slidably connected to the sliding grooves. The length direction of the sliding strips and the length direction of the sliding grooves are both perpendicular to the axial direction of the smooth transition pipe.

[0018] In the gas collection device for collecting waste gas from pickling tanks described in this application embodiment, the sliding seat is provided with a limiting hole, one end of the mounting base is provided with a connecting limiting hole, and the other end is provided with a disassembly limiting hole. Limiting bolts are provided in the limiting hole and the connecting limiting hole, or limiting bolts are provided in the limiting hole and the disassembly limiting hole.

[0019] In the gas collection device for collecting waste gas from pickling tanks according to an embodiment of this application, the gas guide cover includes a surrounding plate and a top cover. The surrounding plate is connected to the pickling tank, the top cover is connected to the end of the surrounding plate away from the pickling tank, the suction pipe is connected to the end of the surrounding plate away from the pickling tank, and the top cover has an arc-shaped structure.

[0020] In the gas collection device for collecting waste gas from pickling tanks as described in the embodiments of this application, the interior of the gas guide cover is provided with several partition plates, and the connection between each of the suction pipes and the gas guide cover is located between two adjacent partition plates.

[0021] Compared with the prior art, the embodiments of this application have the following beneficial effects:

[0022] As can be seen from the above technical solution, the gas collection device for collecting waste gas from pickling tanks provided in this application collects waste gas concentration parameters in different areas of the pickling tank using several concentration meters and feeds them back to the control module. The control module adjusts the output power of the corresponding induced draft fan based on the waste gas concentration parameters to adjust the suction volume. By setting a first pressure sensor and a second pressure sensor, the air pressure at the intake pipe and the air pressure next to the induced draft fan in the intake pipe are collected respectively and fed back to the control module. Based on the two collected air pressure parameters, the control module calculates the negative pressure difference in the intake pipe and adjusts the output power of the corresponding induced draft fan to adjust the suction volume. This solves the technical problem in the prior art where the induced draft fan of the gas collection device usually adopts a fixed power operation mode, which cannot dynamically adjust the suction volume according to the real-time concentration of waste gas and the negative pressure in the duct. This results in low waste gas collection efficiency during the concentrated release of waste gas and when the waste gas concentration is high, leading to acid mist overflow and corrosion of equipment, or waste of electricity under the condition of low waste gas concentration, aggravated wear of the induced draft fan, increased maintenance cost of the induced draft fan, and reduced service life of the induced draft fan. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. The drawings are not intended to be drawn to scale, and for clarity, not every component will be labeled in each drawing. The drawings described below are merely some embodiments of this application. Those skilled in the art can obtain other drawings based on these drawings without creative effort. Wherein:

[0024] Figure 1 This is a front perspective view of an embodiment of this application.

[0025] Figure 2 This is a schematic diagram of the structure of the movable support component in the embodiments of this application.

[0026] Explanation of reference numerals in the attached figures:

[0027] 1-Pickling tank, 2-Gas guide cover, 3-Exhaust fan, 4-Concentration meter, 5-First pressure sensor, 6-Second pressure sensor, 7-Conical contraction tube, 8-Smooth transition tube, 9-Exhaust pipe, 10-Main exhaust pipe, 11-Filter screen, 12-Condensate outlet, 13-End cap, 14-Observation window, 15-Flange, 16-Support block, 17-Support rod, 18-Sliding seat, 19-Mounting base, 20-Arc-shaped support strip, 21-Slide groove, 22-Limiting hole, 23-Disassembly limiting hole, 24-Limiting bolt, 25-Spacing plate. Detailed Implementation

[0028] Existing gas collection devices have significant technical defects: their induced draft fans typically operate at a fixed power, failing to dynamically adjust the suction volume based on real-time exhaust gas concentration and negative pressure within the duct. In actual operation, the exhaust gas generation from the pickling tank varies significantly due to changes in steel coil specifications, acid concentration fluctuations, and production line start-ups and shutdowns. Maintaining low-volume operation of the induced draft fan for extended periods leads to low gas collection efficiency and issues such as acid mist overflow and equipment corrosion during periods of concentrated exhaust gas release. Conversely, maintaining high-volume operation under lower exhaust gas concentration conditions results in wasted energy, accelerated fan wear, increased maintenance costs, and reduced fan lifespan.

[0029] In view of this, this application provides a gas collection device for collecting waste gas from pickling tanks. The concept involves using several concentration meters to collect waste gas concentration parameters from different areas within the pickling tank and feeding them back to a control module. The control module adjusts the output power of the corresponding induced draft fan based on the waste gas concentration parameters to regulate the suction volume. By setting a first pressure sensor and a second pressure sensor, the air pressure at the intake pipe inlet and the air pressure near the induced draft fan within the intake pipe are collected and fed back to the control module. Based on the two collected air pressure parameters, the control module calculates the negative pressure difference in the intake pipe and adjusts the output power of the corresponding induced draft fan to regulate the suction volume. This solves the technical problems in the prior art where the induced draft fan of the gas collection device typically operates at a fixed power, making it impossible to dynamically adjust the suction volume according to the real-time waste gas concentration and the negative pressure within the duct. This results in low waste gas collection efficiency during periods of concentrated waste gas release and high waste gas concentration, leading to acid mist overflow and corrosion of equipment, or energy waste during periods of low waste gas concentration, increased wear on the induced draft fan, increased maintenance costs, and reduced service life.

[0030] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0031] In the description of this application, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of the stated features. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified.

[0032] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0033] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0034] The following disclosure provides many different embodiments or examples for implementing different structures of this application. To simplify the disclosure, specific examples of components and arrangements are described below. Of course, these are merely examples and are not intended to limit the scope of this application. Furthermore, reference numerals and / or letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, various specific examples of processes and materials are provided in this application, but those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0035] This application provides a gas collection device for collecting waste gas from pickling tanks, such as... Figure 1 and Figure 2 As shown. A gas collection device for collecting waste gas from a pickling tank 1 is used to collect waste gas generated in the pickling tank 1 and transport the waste gas to a waste gas treatment tower. It includes a gas guide cover 2, several gas suction components and a control module.

[0036] The control module can be a commonly used PLC in the industry. Those skilled in the art can select a suitable PLC model according to actual needs such as the size of the pickling tank.

[0037] The air guide cover 2 is sealed above the pickling tank 1. Specifically, the air guide cover 2 includes a surrounding plate and a top rod. The surrounding plate is connected to the pickling tank 1, and the top cover is fixedly connected to the end of the surrounding plate away from the pickling tank 1.

[0038] The enclosure and the pickling tank 1 can be fastened together with bolts, and a sealing gasket is provided at the connection to prevent exhaust gas leakage. The top cover and the enclosure are integrally formed.

[0039] Several suction components are spaced apart along the length of the pickling tank 1 on one side of the air guide cover 2. Each suction component includes a suction pipe, an induced draft fan 3, a concentration meter 4, a first pressure sensor 5, and a second pressure sensor 6. The suction pipe is connected to the air guide cover 2. The concentration meter 4 is disposed inside the air guide cover 2 and located on one side of the suction pipe. The first pressure sensor 5 is disposed inside the suction pipe and located at the end where the suction pipe connects to the air guide cover 2. The induced draft fan 3 is disposed at the end of the suction pipe away from the air guide cover 2. The second pressure sensor 6 is disposed inside the suction pipe near the induced draft fan 3. The induced draft fan 3, the concentration meter 4, the first pressure sensor 5, and the second pressure sensor 6 are all electrically connected to the control module.

[0040] Specifically, the intake pipe includes a tapered contraction pipe 7, a smooth transition pipe 8, and an exhaust pipe 9. The end of the tapered contraction pipe 7 with a larger cross-sectional area is connected to the air guide cover 2, and the end with a smaller cross-sectional area is connected to the smooth transition pipe 8. The end of the smooth transition pipe 8 away from the tapered contraction pipe 7 is connected to the induced draft fan 3. The other end of the induced draft fan 3 is connected to the exhaust pipe 9. The other ends of several exhaust pipes 9 are all connected to the main exhaust pipe 10. The end of the main exhaust pipe 10 is connected to the air inlet of the waste gas treatment tower.

[0041] In this system, several suction components are evenly spaced along the length of the pickling tank 1. Several concentration meters 4 are used to collect the exhaust gas concentration in different areas within the air guide cover 2. The first pressure sensor 5 is used to collect the air pressure at the pipe opening of the suction pipe near the air guide cover 2. The second pressure sensor 6 is used to collect the air pressure near the induced draft fan 3 within the suction pipe. To allow the exhaust gas within the air guide cover 2 to better enter the suction pipe, the top cover of the air guide cover 2 has an arc-shaped structure. The suction pipe is connected to the end of the surrounding plate away from the pickling tank 1. Specifically, the suction pipe is connected to the top of the surrounding plate, and the bottom of the top cover is adjacent to the top edge of the suction pipe. It should be noted that the induced draft fan 3 is a variable frequency induced draft fan. The induced draft fan 3, concentration meter 4, first pressure sensor 5, and second pressure sensor 6 are all conventional existing products. This application does not limit their specific models, so the specific connection circuit between them and the control module (PLC) will not be described in detail. Those skilled in the art can select appropriate models according to the actual scale, type of waste gas, wind pressure, and other requirements, and design the connection circuit reasonably according to the selected models. Furthermore, since the waste gas is mainly acid mist, which is corrosive, the suction pipe can be made of corrosion-resistant PP material. The part of the induced draft fan 3 that comes into contact with the waste gas can be coated with an acid and alkali resistant coating. The specific coating can be selected from the market according to the composition of the waste gas.

[0042] In some preferred embodiments, a filter screen 11 is provided at one end of the tapered constriction tube 7 near the smooth transition tube 8, and the filter screen 11 is used to filter metal residue powder.

[0043] In some preferred embodiments, a condensation groove is provided at the bottom of the conical contraction tube 7, and a condensate outlet 12 is provided at one end of the condensation groove near the air guide cover 2, and an end cap 13 is provided on the condensate outlet 12.

[0044] Since the bottom end of the conical contraction tube 7 is inclined, the condensation tank is also inclined, with the inclination direction sloping upward from the end near the air guide cover 2 to the end away from the air guide cover 2. The condensate outlet 12 is located at the bottom end of the condensation tank, near the air guide cover 2. The condensation tank is used to collect condensate. When the end cap 13 is opened, the condensate flows out from the condensate outlet 12 to prevent condensate accumulation and corrosion of the conical contraction tube 7. The end cap 13 and the condensate outlet 12 can be threaded together.

[0045] In some preferred embodiments, an observation window 14 is provided on one side wall of the tapered contraction tube 7.

[0046] The observation window 14 allows staff to easily observe the buildup on the filter screen 11 and the accumulation of condensate in the conical contraction tube 7.

[0047] In some preferred embodiments, the air guide cover 2, the tapered contraction tube 7, the smooth transition tube 8, the induced draft fan 3, the air outlet pipe 9, and the main air outlet pipe 10 are all detachably connected by a flange 15.

[0048] The air guide cover 2, the conical contraction tube 7, the smooth transition tube 8, the induced draft fan 3, the air outlet pipe 9, and the main air outlet pipe 10 are all connected by the flange 15, which facilitates disassembly and maintenance. A sealing gasket is provided between the two interconnected flanges 15 to prevent exhaust gas leakage.

[0049] In some preferred embodiments, the intake duct further includes a movable support assembly, which includes a support block 16, a support rod 17, a sliding seat 18, and a mounting base 19. The support block 16 is mounted on the top of the support rod 17 and has at least two arc-shaped support bars 20. The end of each arc-shaped support bar 20 away from the support block 16 is fixedly connected to the end of the smooth transition pipe 8 near the induced draft fan 3. The sliding seat 18 is fixedly mounted on the bottom of the support rod 17, and the end of the sliding seat 18 away from the support rod 17 is provided with... At least two sliding bars are provided. The mounting base 19 is fixedly installed in the working area and has at least two sliding grooves 21. The sliding bars are slidably connected to the sliding grooves 21. The length direction of the sliding bars and the length direction of the sliding grooves 21 are both perpendicular to the axial direction of the smooth transition tube 8. The sliding seat 18 is provided with a limiting hole 22. One end of the mounting base is provided with a connection limiting hole and the other end is provided with a disassembly limiting hole 23. Limiting bolts 24 are provided in the limiting hole 22 and the connection limiting hole, or limiting bolts 24 are provided in the limiting hole 22 and the disassembly limiting hole 23.

[0050] By configuring the movable support assembly, when maintenance of the suction assembly is required, the corresponding flange 15 and the limiting bolt 24 are loosened, and the sliding seat 18 is pushed to slide to the other end of the mounting base 19, facilitating maintenance by the operator. For example, the flange 15 between the smooth transition tube 8 and the tapered contraction tube 7 is loosened, and then the flange 15 between the smooth transition tube 8 and the induced draft fan 3 is loosened. The limiting bolt 24 is then unscrewed, and the sliding seat 18 is pushed to move towards the other end of the mounting base 19. At this time, the operator can then inspect the tapered contraction tube 7 and the filter screen 1. 1. The smooth transition pipe 8 or the induced draft fan 3 is flushed and maintained. It should be noted that when the smooth transition pipe 8 is located at the position where it is connected to the tapered contraction pipe 7 and the induced draft fan 3, the limiting hole 22 and the connecting limiting hole are coaxially connected. At this time, the limiting bolt 24 is tightened in the limiting hole 22 and the connecting limiting hole. When the pipeline needs to be maintained, the sliding seat 18 is pushed to the other end of the mounting base 19. The limiting hole 22 and the disassembly limiting hole 23 are coaxially connected. At this time, the limiting bolt 24 is tightened in the limiting hole 22 and the disassembly limiting hole 23 to prevent slippage.

[0051] In some preferred embodiments, the air guide cover 2 is provided with a plurality of spacers 25 inside, and the connection between each air intake pipe and the air guide cover 2 is located between two adjacent spacers 25.

[0052] By setting up several partition plates 25, the "waste gas space" enclosed by the air guide cover 2 and the pickling tank 1 is divided into several waste gas areas. Each air intake component is responsible for collecting waste gas in one waste gas area, preventing different air intake components from affecting each other and affecting the waste gas absorption efficiency.

[0053] In summary, the gas collection device for collecting waste gas from pickling tanks provided in this application collects waste gas concentration parameters from different areas within the pickling tank using several concentration meters and feeds them back to the control module. The control module adjusts the output power of the corresponding induced draft fan based on the waste gas concentration parameters to regulate the suction volume. By setting a first pressure sensor and a second pressure sensor, the air pressure at the intake pipe and the air pressure near the induced draft fan in the intake pipe are collected respectively and fed back to the control module. Based on the two collected air pressure parameters, the control module calculates the negative pressure difference in the intake pipe and adjusts the output power of the corresponding induced draft fan to regulate the suction volume. This solves the technical problems in the prior art where the induced draft fan of the gas collection device usually adopts a fixed power operation mode, which cannot dynamically adjust the suction volume according to the real-time concentration of waste gas and the negative pressure in the duct. This results in low waste gas collection efficiency during the concentrated release and high concentration of waste gas, leading to acid mist overflow and corrosion of equipment, or energy waste, accelerated wear of the induced draft fan, increased maintenance costs, and reduced service life of the induced draft fan under low waste gas concentration conditions.

[0054] The above provides a detailed description of a gas collection device for collecting waste gas from pickling tanks, as provided in the embodiments of this application. Specific examples have been used to illustrate the principles and implementation methods of this application. The descriptions of the above embodiments are only for the purpose of helping to understand the technical solutions and core ideas of this application. Those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A gas collection device for collecting waste gas from pickling tanks, used to collect waste gas generated in the pickling tank and transport the waste gas to a waste gas treatment tower, characterized in that, Includes an air guide cover, several air intake components, and a control module; The air guide cover is sealed above the pickling tank; A plurality of the aforementioned air-suction components are spaced apart along the length of the pickling tank on one side of the air-guiding cover. Each air-suction component includes an air-suction pipe, an induced draft fan, a concentration meter, a first pressure sensor, and a second pressure sensor. The air-suction pipe is connected to the air-guiding cover. The concentration meter is disposed inside the air-guiding cover and located on one side of the air-suction pipe. The first pressure sensor is disposed inside the air-suction pipe and located at the end where the air-suction pipe connects to the air-guiding cover. The induced draft fan is disposed at the end of the air-suction pipe away from the air-guiding cover. The second pressure sensor is disposed inside the air-suction pipe near the induced draft fan. The induced draft fan, concentration meter, first pressure sensor, and second pressure sensor are all electrically connected to the control module.

2. The gas collection device for collecting waste gas from pickling tanks as described in claim 1, characterized in that, The intake pipe includes a tapered constriction pipe, a smooth transition pipe, and an exhaust pipe; The end of the tapered contraction tube with the larger cross-sectional area is connected to the air guide cover, and the end with the smaller cross-sectional area is connected to the smooth transition tube. The end of the smooth transition tube away from the tapered contraction tube is connected to the induced draft fan. The other end of the induced draft fan is connected to the exhaust pipe. The other ends of the plurality of exhaust pipes are all connected to the main exhaust pipe. The end of the main exhaust pipe is connected to the air inlet of the waste gas treatment tower.

3. The gas collection device for collecting waste gas from pickling tanks as described in claim 2, characterized in that, A filter screen is provided at one end of the tapered contraction tube near the smooth transition tube.

4. The gas collection device for collecting waste gas from pickling tanks as described in claim 2, characterized in that, The bottom of the conical contraction tube is provided with a condensation tank, and the end of the condensation tank near the air guide cover is provided with a condensate outlet, and the condensate outlet is provided with an end cap.

5. The gas collection device for collecting waste gas from pickling tanks as described in claim 2, characterized in that, An observation window is provided on one side wall of the tapered contraction tube.

6. The gas collection device for collecting waste gas from pickling tanks as described in claim 2, characterized in that, The air guide cover, tapered contraction tube, smooth transition tube, induced draft fan, air outlet pipe, and main air outlet pipe are all detachably connected by flanges.

7. The gas collection device for collecting waste gas from pickling tanks as described in claim 2, characterized in that, The air intake duct also includes a movable support assembly, which includes a support block, a support rod, a sliding seat, and a mounting base. The support block is installed at the top of the support rod, and at least two arc-shaped support bars are provided on it. The end of the arc-shaped support bar away from the support block is fixedly connected to the end of the smooth transition pipe near the induced draft fan. The sliding seat is fixedly installed at the bottom of the support rod, and at least two sliding strips are provided at the end of the sliding seat away from the support rod. The mounting base is fixedly installed in the working area, and at least two sliding grooves are provided on it. The sliding strips are slidably connected to the sliding grooves. The length direction of the sliding strips and the length direction of the sliding grooves are both perpendicular to the axial direction of the smooth transition pipe.

8. The gas collection device for collecting waste gas from pickling tanks as described in claim 7, characterized in that, The sliding seat is provided with a limiting hole, one end of the mounting base is provided with a connecting limiting hole, and the other end is provided with a disassembly limiting hole. A limiting bolt is provided in the limiting hole and the connecting limiting hole, or a limiting bolt is provided in the limiting hole and the disassembly limiting hole.

9. The gas collection device for collecting waste gas from pickling tanks as described in claim 1, characterized in that, The air guide cover includes a surrounding plate and a top cover. The surrounding plate is connected to the pickling tank, and the top cover is connected to the end of the surrounding plate away from the pickling tank. The air intake pipe is connected to the end of the surrounding plate away from the pickling tank, and the top cover has an arc-shaped structure.

10. The gas collection device for collecting waste gas from pickling tanks as described in claim 9, characterized in that, The air guide cover has several partition plates inside, and the connection between each air intake pipe and the air guide cover is located between two adjacent partition plates.

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