Combined type tank edge strip seam exhaust hood of pickling tank

Abstract

The invention relates to the technical field of acid mist control of pickling tanks, in particular to a combined tank edge strip seam exhaust hood of a pickling tank. The air exhaust device comprises a rectangular main air exhaust pipeline, at least two ventilation pieces and air exhaust hoods matched with the ventilation pieces in number. Any exhaust hood is installed corresponding to one ventilation piece. The exhaust hood is provided with a slot exhaust outlet; the ventilation pieces are sequentially arranged in the length direction of the rectangular main exhaust pipeline, the outlet end of the exhaust hood is connected with the ventilation pieces, and air flow enters the exhaust hood through the slit exhaust outlets and then is converged into the rectangular main exhaust pipeline through the ventilation pieces; the rectangular main exhaust pipeline is connected with an external purification device and a fan; the horizontal size of the rectangular main exhaust pipeline is gradually increased in the air flow confluence direction. The device can ensure that the air speed of the air flow inlets of the exhaust hoods corresponding to the pickling tanks with different lengths is uniform, and effectively controls the dissipation of acid mist.

Description

Technical Field

[0001] This invention relates to the field of acid mist control technology in pickling tanks, and in particular to a combined tank edge slot exhaust hood for pickling tanks. Background Technology

[0002] Pipe pickling typically uses long pickling tanks, ranging from 3m to 9m in length and generally less than 0.7m in width. Pipes are placed into the pickling tank for pickling, and then removed after pickling. Therefore, a certain amount of space above the pickling tank and one side along its long axis require personnel for removal operations. Existing ventilation methods for pickling tanks include installing external exhaust hoods and internal exhaust vents. Existing external exhaust hoods for pickling tanks include single-sided tank-side exhaust hoods, double-sided tank-side exhaust hoods, and blow-suction exhaust hoods. Single-sided tank-side exhaust hoods are generally used for pickling tanks with a width of <0.7m, double-sided exhaust hoods are generally used for pickling tanks with a width of 0.7m to 1.2m, and blow-suction exhaust hoods are generally used for exhaust hoods with a width of >1.2m. In order to increase the control effect, a slotted arrangement is adopted. The internal exhaust vents of the pickling tank are located between the acid surface and the top of the pickling tank. Pickling tanks with a length of less than 1.5m are mostly equipped with 1 to 2 small-sized exhaust vents, while longer pickling tanks are equipped with multiple small-sized exhaust vents.

[0003] The aforementioned exhaust hoods are generally suitable for pickling tanks with a length of less than 1.5m. When the length exceeds 1.5m, the exhaust velocity cannot be uniformly set, and the controlled velocity cannot cover the entire exposed surface of the pickling tank, causing acid mist to escape. The method of setting up the exhaust vents inside the pickling tank, based on ventilation principles, results in small exhaust sizes. The exhaust airflow cannot cover the entire surface of the pickling tank, only providing ventilation near the vents. Ventilation is essentially ineffective at locations slightly further away from the vents, causing acid mist to escape. Furthermore, the airflow and velocity of the multiple small exhaust vents installed in long pickling tanks are not balanced, leading to some vents having high airflow while others have low airflow. Summary of the Invention

[0004] The purpose of this invention is to address the problems existing in the background technology by proposing a combined tank edge slot exhaust hood for pickling tanks. It is mainly used for controlling the acid mist hazard in long pickling tanks. By setting the size of the ventilation components, the wind speed of each exhaust port is evenly distributed, so that the controlled wind speed can cover the entire surface of the pickling tank, thereby achieving the purpose of controlling acid mist and protecting the health of workers. It can effectively control the spread of acid mist hazards in long pickling tanks.

[0005] The technical solution of the present invention is a combined tank edge slot exhaust hood for pickling tanks, comprising a rectangular main exhaust duct, at least two ventilation components, and an exhaust hood matching the number of ventilation components; Each exhaust hood is installed with a corresponding ventilation component; the exhaust hood is equipped with a slotted exhaust port. The ventilation components are arranged sequentially along the length of the rectangular main exhaust duct. The outlet end of the exhaust hood is connected to the ventilation components. After the airflow enters the exhaust hood through the slotted exhaust port, it flows into the rectangular main exhaust duct through the ventilation components. The rectangular main exhaust duct connects the external purification device and the fan. The horizontal dimension of the rectangular main exhaust duct gradually increases along the direction of airflow convergence.

[0006] Preferably, the rectangular main exhaust duct, ventilation components, exhaust hood, and slotted exhaust outlet are all made of acid-resistant and corrosion-resistant materials.

[0007] Preferably, corrosion-resistant PP, corrosion-resistant PVC, or corrosion-resistant stainless steel are selected as the corrosion-resistant materials for pickling tanks using sulfuric acid or nitric acid as raw materials.

[0008] Preferably, corrosion-resistant PP or corrosion-resistant PVC are selected as the corrosion-resistant material for pickling tanks using hydrochloric acid as raw material.

[0009] Preferably, the vertical dimension of each ventilation component is uniformly set to 300mm, and the horizontal dimension increases progressively along the extension direction of the rectangular main exhaust duct 1.

[0010] Preferably, the number of exhaust hoods is set to 2-6.

[0011] Preferably, the controlled wind speed at each part of the washing tank surface is not less than 0.3 m / s and not more than 0.5 m / s.

[0012] Preferably, the connection between the ventilation component and the rectangular main exhaust duct has an outer chamfer facing the airflow direction; the diameter of the outer chamfer is 100mm.

[0013] Preferably, the cross-section of the rectangular main exhaust duct 1 is square, and the air velocity inside the duct is not less than 6 m / s. Its dimensions are determined based on the total exhaust volume, which is calculated using the following formula: Calculate, where: a is the segmented trough length, b is the trough width, v is the control wind speed at the edge control point, and x is the number of exhaust hoods.

[0014] Preferably, the length of the slotted exhaust vent is the same as the length of the airflow inlet of the exhaust hood, and the width of the slotted exhaust vent is calculated according to the following formula: Where: L is the exhaust volume of a single exhaust hood, v0 is the intake velocity of the slot exhaust port, and is the length of the slot exhaust port; the distance between the lower end of the slot exhaust port and the lower end of the exhaust hood is 50mm~100mm.

[0015] Compared with the prior art, the present invention has the following beneficial technical effects: (1) The present invention can ensure that the wind speed at each position above the long pickling tank is not less than 0.3m / s, and can efficiently collect and control the generated acid mist.

[0016] (2) The present invention has designed the implementation dimensions of pickling tanks of different lengths.

[0017] (3) The wind speed of the slotted exhaust vents of each exhaust hood in this invention is uniformly set. Attached Figure Description

[0018] Figure 1 This is an isometric airflow diagram of the slotted exhaust hood in an embodiment of the present invention.

[0019] Figure 2 This is a top view of the exhaust hood with grooved edges in an embodiment of the present invention.

[0020] Figure 3 This is a partial structural schematic diagram of the slotted exhaust hood in an embodiment of the present invention.

[0021] Figure 4 This is a simulated cloud map of the wind speed of the slotted exhaust hood in an embodiment of the present invention.

[0022] Figure 5 This is the simulation result of the wind speed at the slotted exhaust port of the slotted exhaust hood in the embodiment of the present invention.

[0023] Figure 6 This is an isometric schematic diagram of the slotted exhaust hood in an embodiment of the present invention. Figure 7 This is a schematic diagram of the dimensions and structure of the slotted exhaust hood in an embodiment of the present invention.

[0024] Reference numerals in the attached drawings: 1. Rectangular main exhaust duct; 2. First ventilation component; 3. Second ventilation component; 4. Third ventilation component; 5. Fourth ventilation component; 6. Fifth ventilation component; 7. Sixth ventilation component; 71. Outer chamfer; 8. Exhaust hood; 9. Slotted exhaust outlet. Detailed Implementation

[0025] Example 1 This embodiment proposes a combined tank edge slot exhaust hood for pickling tanks, including a rectangular main exhaust duct 1, at least two ventilation components, and an exhaust hood 8 matching the number of ventilation components; Each exhaust hood 8 is installed with a corresponding ventilation component; the exhaust hood 8 is provided with a slotted exhaust port 9. The ventilation components are arranged sequentially along the length of the rectangular main exhaust duct 1. The outlet end of the exhaust hood 8 is connected to the ventilation components. After the airflow enters the exhaust hood 8 through the slotted exhaust port 9, it flows into the rectangular main exhaust duct 1 through the ventilation components. The rectangular main exhaust duct 1 connects to the external purification device and the fan. The horizontal dimension of the rectangular main exhaust duct 1 gradually increases along the direction of airflow convergence.

[0026] In an optional embodiment, the rectangular main exhaust duct 1, ventilation components, exhaust hood 8, and slotted exhaust outlet 9 are all made of acid-resistant and corrosion-resistant materials; wherein, for pickling tanks using sulfuric acid or nitric acid as raw materials, corrosion-resistant PP, corrosion-resistant PVC, or corrosion-resistant stainless steel are selected as corrosion-resistant materials; for pickling tanks using hydrochloric acid as raw materials, corrosion-resistant PP or corrosion-resistant PVC are selected as corrosion-resistant materials.

[0027] As a preferred option, the vertical dimension of each ventilation component is uniformly set to 300mm, and the horizontal dimension increases progressively along the extension direction of the rectangular main exhaust duct 1. The number of exhaust hoods is set to 2-6. The controlled air velocity at each part of the pickling tank surface is not less than 0.3m / s and not more than 0.5m / s.

[0028] At the connection between the ventilation component and the rectangular main exhaust duct 1, an outer chamfer 71 is provided facing the airflow direction; the diameter of the outer chamfer 71 is 100mm. The outer chamfer 71 allows the airflow to transition smoothly when splitting or merging, reducing eddies and airflow separation, reducing local resistance loss, ensuring uniform airflow velocity at each exhaust vent, reducing noise generated by airflow impact, and improving exhaust efficiency; preventing acid accumulation and corrosion, and extending service life: the chamfer avoids the formation of dead corners for acid and dust accumulation, reduces local corrosion caused by acid mist condensation and accumulation at the corners, and is suitable for use with acid-resistant materials such as PP and PVC, improving the overall system durability.

[0029] The rectangular main exhaust duct 1 has a square cross-section, and the air velocity inside the duct is not less than 6 m / s. Its dimensions are determined based on the total exhaust volume, which is calculated using the following formula: The calculation is performed, where: a is the segmented slot length, b is the slot width, v is the control velocity at the edge control point, and x is the number of exhaust hoods. The length of the slotted exhaust vent 9 is consistent with the airflow inlet length of the exhaust hood 8, and the width of the slotted exhaust vent 9 is calculated using the following formula: Where: L is the exhaust volume of a single exhaust hood, v0 is the intake velocity of the slotted exhaust port, and l is the length of the slotted exhaust port; the distance between the lower end of the slotted exhaust port 9 and the lower end of the exhaust hood is 50mm~100mm.

[0030] To facilitate understanding of the solution in this application, a specific example is used below to provide a detailed description of this embodiment: Reference Figure 1 In the isometric schematic diagram of the present invention, the airflow enters through the slotted exhaust port 9, passes through the exhaust hood 8, and then sequentially enters the first ventilation component 2, the second ventilation component 3, the third ventilation component 4, the fourth ventilation component 5, the fifth ventilation component 6, and the seventh ventilation component 7. After entering the rectangular main exhaust duct 1, it is sent to the rear purification device and the fan to be discharged outdoors.

[0031] The rectangular main exhaust duct 1, all ventilation components 2, 3, 4, 5, 6, 7, exhaust hood 8, and slotted exhaust outlet 9 are all made of acid-resistant and corrosion-resistant materials.

[0032] The total air volume of the rectangular main exhaust duct 1 is calculated according to Formula 1. The calculation is performed in segments based on the length of the exhaust hood 8. The control velocity v at the edge control points is taken as 0.3~0.5 m / s; in this example, it is taken as 0.3 m / s. The calculated exhaust volume is 9720 m³ / s. 3 / h.

[0033] m 3 / h (Equation 1) In the formula: a—Length of segmented groove, in meters; b—slot width, m; v—Control wind speed at the edge control point, m / s.

[0034] x — Number of exhaust hoods The rectangular main exhaust duct 1 has a square cross-section, and its dimensions are calculated based on the air volume. It is necessary to ensure that the air velocity inside the duct is not less than 6m / s. In this example, the dimension is 500mm.

[0035] Reference Figure 7 Ventilation components 2, 3, 4, 5, 6, and 7 have a vertical dimension of 300mm and horizontal dimensions from left to right of 120mm, 140mm, 160mm, 200mm, 300mm, and 500mm, respectively. The connection points of the ventilation components are provided with an external chamfer with a diameter of 100mm.

[0036] Reference Figure 7 The exhaust hood 8 has a width of 1500mm and a vertical dimension that is the same as the vertical dimension of the first ventilation component 2, which is 300mm in this example. A total of 6 hoods are installed, with a total length of 9000mm. The airflow enters from below the exhaust hood 8 and exits from above the exhaust hood 8. The outlet at the top of the exhaust hood 8 is located at the horizontal middle position of the exhaust hood 8.

[0037] Reference Figure 3 The slotted exhaust vent 9 is located at the airflow inlet of the exhaust hood 8. The length of the slot is 1500mm, and the width is calculated according to formula 2, with a maximum of 50mm. In this example, it is 50mm. The lower end of the slotted exhaust vent 9 is 50~100mm from the lower end of the exhaust hood 8.

[0038] m (Equation 2) Where: L—exhaust volume of the exhaust hood, m 3 / h; v0—Intake velocity at the edge strip opening, m / s, typically taken as 6~10m / s; l — Length of the seam Reference Figure 4 Numerical simulation of the present invention showed that the wind speed at the airflow inlet of the exhaust hood 8 was basically uniform.

[0039] Reference Figure 5 Numerical simulation of the present invention shows that the wind speed at the airflow inlet of the slotted exhaust port 9 is basically uniform and can reach about 6m / s.

[0040] This invention takes a pickling tank with a length of 9m and a width of 0.6m as an example. The implementation dimensions of pickling tanks of different lengths are shown in Table 1. Table 1 Implementation dimensions of pickling tanks of different lengths

[0041] Based on the above data, this invention proposes a segmented single-sided slotted exhaust hood combined with a rectangular ventilation component size optimization scheme. This ensures uniform airflow velocity at the exhaust hood inlet for pickling tanks of different lengths, effectively controlling acid mist dispersion. In practical applications, this exhaust hood can flexibly adjust parameters such as the number of exhaust hoods, the horizontal dimensions of the ventilation components, and the total exhaust duct size according to the specific dimensions of the pickling tank, to adapt to diverse production scenario requirements. The main advantages are as follows: Modular design adaptability: The segmented exhaust hood design can flexibly adapt to the modification needs of pickling tanks of different lengths. For production line upgrades, there is no need to replace the entire exhaust system; simply add or remove exhaust units as needed along the length of the tank, significantly reducing modification costs.

[0042] Standardized production of rectangular ventilation components: The optimized range of rectangular ventilation component sizes (120mm-500mm) conforms to the standard specifications of industrial ventilation ducts, facilitating factory prefabrication. This standardized design shortens the construction cycle while ensuring interface sealing and reducing the risk of air leakage.

[0043] Balancing energy consumption and performance: By controlling the uniformity of airflow, the energy waste caused by "local over-suction" in traditional designs is avoided. The optimized solution can significantly reduce the total air volume of the system while ensuring capture efficiency, which meets the requirements of green manufacturing.

[0044] Compared to traditional exhaust hoods, this invention, through its unique modular structure and optimized dimensions, achieves a uniform distribution of airflow velocity at each exhaust vent. This allows the controlled airflow to cover the entire pickling tank surface, significantly improving acid mist control, effectively protecting workers' health, and reducing environmental pollution caused by acid mist. This results in substantial economic and social benefits. Furthermore, the use of acid-resistant and corrosion-resistant materials ensures a long service life for the exhaust hoods in harsh pickling environments, reducing equipment maintenance and replacement costs for businesses.

[0045] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited thereto. Various changes can be made within the scope of knowledge possessed by those skilled in the art without departing from the spirit of the present invention.

Claims

1. A combined tank edge slotted exhaust hood for pickling tanks, characterized in that, Includes a rectangular main exhaust duct (1), at least two ventilation components, and an exhaust hood (8) matching the number of ventilation components; Each exhaust hood (8) is installed with a corresponding ventilation component; the exhaust hood (8) is provided with a slotted exhaust port (9); The ventilation components are arranged sequentially along the length of the rectangular main exhaust duct (1). The outlet end of the exhaust hood (8) is connected to the ventilation components. After the airflow enters the exhaust hood (8) through the slotted exhaust port (9), it flows into the rectangular main exhaust duct (1) through the ventilation components. The rectangular main exhaust duct (1) connects the external purification device and the fan. The horizontal dimension of the rectangular main exhaust duct (1) gradually increases along the direction of airflow convergence.

2. The combined tank edge slotted exhaust hood for pickling tanks according to claim 1, characterized in that, The rectangular main exhaust duct (1), ventilation components, exhaust hood (8), and slotted exhaust outlet (9) are all made of acid-resistant and corrosion-resistant materials.

3. The combined tank edge slot exhaust hood for pickling tanks according to claim 2, characterized in that, For pickling tanks using sulfuric acid or nitric acid as raw materials, corrosion-resistant PP, corrosion-resistant PVC, or corrosion-resistant stainless steel should be selected as the corrosion-resistant materials.

4. The combined tank edge slot exhaust hood for pickling tanks according to claim 2, characterized in that, For pickling tanks using hydrochloric acid as raw material, corrosion-resistant PP or corrosion-resistant PVC should be selected as the corrosion-resistant material.

5. The combined tank edge slotted exhaust hood for pickling tanks according to claim 1, characterized in that, The vertical dimension of each ventilation component is uniformly set to 300mm, and the horizontal dimension increases along the extension direction of the rectangular main exhaust duct (1).

6. The combined tank edge slotted exhaust hood for pickling tanks according to claim 1, characterized in that, The number of exhaust hoods should be set to 2-6.

7. The combined tank edge slotted exhaust hood for pickling tanks according to claim 1, characterized in that, The controlled wind speed at each part of the pickling tank surface shall not be less than 0.3 m / s and shall not exceed 0.5 m / s.

8. The combined tank edge slotted exhaust hood for pickling tanks according to claim 1, characterized in that, At the connection between the ventilation component and the rectangular main exhaust duct (1), an outer chamfer (71) is provided facing the airflow direction; the diameter of the outer chamfer (71) is 100mm.

9. A combined tank edge slotted exhaust hood for pickling tanks according to claim 1, characterized in that, The cross-section of the rectangular main exhaust duct (1) is square, and the air velocity inside the duct is not less than 6m / s. Its dimensions are determined based on the total exhaust volume, which is calculated using the following formula: Calculate, where: a is the segmented trough length, b is the trough width, v is the control wind speed at the edge control point, and x is the number of exhaust hoods.

10. A combined tank edge slotted exhaust hood for pickling tanks according to claim 1, characterized in that, The length of the slotted exhaust vent (9) is the same as the length of the airflow inlet of the exhaust hood (8), and the width of the slotted exhaust vent (9) is calculated according to the following formula: Where: L is the exhaust volume of a single exhaust hood, v0 is the intake velocity of the slot exhaust port, and l is the length of the slot exhaust port; the distance between the lower end of the slot exhaust port (9) and the lower end of the exhaust hood is 50mm~100mm.

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