Absorption tower conical sieve plate tray for nitric acid device

Abstract

The utility model provides an absorption tower conical sieve plate tray for a nitric acid device, which relates to the technical field of chemical equipment and comprises a tray main body and a positioning column, a tray sieve plate is mounted in the tray main body close to the top surface, foot frames are distributed in the tray main body in a linear array manner, and a tray main beam is arranged in the center of the tray main body. The bottom surface of the tower tray main beam is bolted with the surface of the bottom frame at the bottom, the top surfaces of the bottom frames at the two sides of the tower tray main beam are bolted with second beams, the top surface of the tower tray main beam is bolted with pressing and fixing discs, cooling coils are arranged between the adjacent second beams, and cooling coils are arranged between the adjacent pressing and fixing discs; the S-shaped cooling coil obviously prolongs the flowing path of a cooling medium in the tower tray, so that the cooling medium has more time to be in contact with rising gas in the downward flowing process, the sufficient mass transfer reaction is promoted, the uniformity of gas-liquid contact is optimized, the chemical reaction rate is increased, and the output capacity of nitric acid in unit time is also improved.

Description

Technical Field

[0001] This utility model relates to the field of chemical equipment technology, and in particular to a conical sieve tray for an absorption tower in a nitric acid plant. Background Technology

[0002] According to a combined tray / sieve tray disclosed in Chinese Publication No. CN208928177U, a first overflow weir is provided above the first liquid outlet, and several baffles are provided around the first overflow weir. One end of each baffle is located around the first overflow weir, and the other end extends in a divergent manner to the outer edge of the first tray / sieve tray. A second tray / sieve tray is provided with several distribution plates, one end of which is located directly below the first liquid inlet, and the other end extends in a divergent manner to the outer edge of the second tray / sieve tray. A second liquid outlet is provided between two adjacent distribution plates, located at the outer edge of the second tray / sieve tray. A second overflow weir is provided above the second liquid outlet. This structure allows the absorbent to flow through all parts of the tray / sieve tray, ensuring sufficient contact and reaction between the absorbent and the NOx gas passing vertically upward through the tray / sieve tray, thereby increasing productivity.

[0003] The aforementioned patent documents and prior art have the following technical problems:

[0004] 1. The absorption tower trays of existing nitric acid plants mostly adopt the design of linear cooling coils and flat tray sieve plates, which results in a short residence time of the cooling medium in the tray and insufficient gas-liquid contact. Especially when operating at high load, the gas is prone to short circuits or uneven distribution, thereby reducing mass transfer efficiency and absorption effect.

[0005] 2. When the existing absorption tower trays are subjected to high-intensity gas-liquid impact and pressure fluctuations for a long time, the support structure is prone to deformation or even failure due to single-force design or loose connections. This is especially true in the edge areas or the fixed parts of the cooling coils, where vibration and stress concentration problems are particularly obvious and the stability is poor. Utility Model Content

[0006] The purpose of this invention is to address the shortcomings of existing nitric acid plant trays, such as low gas-liquid exchange efficiency and insufficient structural stability, by proposing a conical sieve tray for the absorption tower of a nitric acid plant.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: a conical sieve tray for an absorption tower in a nitric acid plant, comprising a tray body and positioning columns. A tray sieve plate is installed inside the tray body near the top surface. A base frame is arranged in a linear array inside the tray body. A main beam is provided at the center of the tray body, and the bottom surface of the main beam is bolted to the surface of the base frame at the bottom. Second beams are bolted to the top surfaces of the base frames on both sides of the tray body. A clamping and fixing plate is bolted to the top surface of the tray body. A cooling coil is provided between adjacent second beams and between adjacent clamping and fixing plates. Limiting plates that abut against the cooling coils are provided on the sides of both the second beams and the clamping and fixing plates.

[0008] Preferably, the tray body is provided with an installation ring near the bottom surface, the tray sieve plate is provided with a flow guide hole, the edge of the tray sieve plate is vertically bolted to the surface of the installation ring, the longitudinal section of the flow guide hole is a combination of rectangle and trapezoid, and the spatial configuration of the flow guide hole in the trapezoidal section is conical.

[0009] Preferably, the top surfaces of the main beam and the second beam of the tower plate are coplanar, the bottom surface of the clamping and fixing plate is bolted to both the top surface of the second beam and the top surface of the main beam of the tower plate, and the distribution direction of the clamping and fixing plate is parallel to the distribution direction of the main beam of the tower plate.

[0010] Preferably, the second beams are evenly distributed in a straight line array on both sides of the main beam of the tower plate, the number of the second beams corresponds one-to-one with the number of the scaffolding, and the spacing between the second beams is the same as the spacing between the scaffolding.

[0011] Preferably, the side of the limiting plate abuts against the side of the cooling coil, and both ends of the limiting plate are bolted to the top surface of the second beam.

[0012] Preferably, the cooling coils are distributed in an S-shape between adjacent second beams, and a supporting angle steel perpendicular to the main beam of the tower is welded between adjacent second beams, and the connection between the supporting angle steel and the second beam is achieved by plug welding.

[0013] Preferably, the clamping and fixing plate and the second beam near the inner wall of the main body of the tower tray are welded to the inner wall of the main body of the tower tray, and the bottom surface of the clamping and fixing plate abuts against the top surface of the main beam of the tower tray.

[0014] Beneficial effects

[0015] In this invention, a multi-layered S-shaped cooling coil is installed inside the main body of the tray, forming a unique liquid-gas interaction system with the guide holes on the surface of the tray sieve plate. Compared with traditional straight cooling coils or ordinary flat-hole trays, the S-shaped cooling coil significantly extends the flow path of the cooling medium within the tray, allowing the cooling medium more time to contact the rising gas during the downward flow, thus promoting a full mass transfer reaction. At the same time, the reasonable distribution of the guide holes ensures that the gas can pass through the tray sieve plate evenly, avoiding local airflow concentration or short-circuiting, further optimizing the uniformity of gas-liquid contact. It is particularly suitable for scenarios requiring high-efficiency absorption in nitric acid plants, accelerating the chemical reaction rate and increasing the nitric acid production capacity per unit time, bringing higher economic benefits to industrial production, while reducing material waste caused by insufficient mass transfer.

[0016] In this invention, a distributed grid support system consisting of the main beam of the tray, the second beam, and the clamping and fixing plate, along with the synergistic effect of the foot frame, the limiting plate, and the supporting angle steel, is used to construct a multi-layered, highly rigid structural frame. The main beam of the tray serves as the central support and is tightly connected to the evenly distributed second beam and the foot frame through bolts. The clamping and fixing plate is arranged parallel to the main beam of the tray, forming a stable mechanical transmission network. This allows the tray to maintain structural integrity under high-intensity gas-liquid flow and pressure fluctuations, avoiding the deformation or even failure problems caused by local stress concentration or vibration in traditional trays. The high stability and durability significantly reduce the frequency of equipment maintenance and downtime, providing a reliable guarantee for the continuous and efficient operation of the nitric acid plant. Attached Figure Description

[0017] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0018] Figure 2 This is a structural diagram of the tray sieve plate of this utility model.

[0019] Figure 3 This is a surface structure diagram of the tray sieve plate of this utility model;

[0020] Figure 4 This is a plan view of the connection between the main beam of the tower plate and the base frame of this utility model;

[0021] Figure 5 This is a plan view showing the connection between the second beam and the base frame of this utility model;

[0022] Figure 6 This is a plan view showing the connection between the clamping and fixing plate and the main beam of the tower plate in this utility model;

[0023] Figure 7 This is a plan view showing the connection between the clamping and fixing plate and the second beam of this utility model;

[0024] Figure 8This is a plan view showing the connection between the clamping and fixing plate and the main body of the tower tray in this utility model;

[0025] Figure 9 This is a plan view showing the connection between the second beam and the main body of the tower plate in this utility model;

[0026] Figure 10 This is a diagram showing the distribution structure of the cooling coils in this utility model;

[0027] Figure 11 This is a side view of the cooling coil distribution of this utility model;

[0028] Figure 12 This is a plan view of the cooling coil installation of this utility model;

[0029] Figure 13 This is a cross-sectional view of the guide hole of this utility model.

[0030] Legend:

[0031] 1. Tray body; 2. Tray main beam; 3. Compression fixing plate; 4. Second beam; 5. Base frame; 6. Support angle steel; 7. Tray screen plate; 8. Guide hole; 9. Mounting ring; 10. Cooling coil; 11. Limiting plate; 12. Positioning column. Detailed Implementation

[0032] To make the technical means, creative features, and achieved objectives and effects of this utility model easier to understand, the present utility model is further described below with reference to specific embodiments and accompanying drawings. However, the following embodiments are merely preferred embodiments of this utility model and not all of them. Other embodiments obtained by those skilled in the art based on the embodiments described in the implementation plan without creative effort are all within the protection scope of this utility model.

[0033] The specific embodiments of this utility model are described below with reference to the accompanying drawings. Specific Implementation Example 1:

[0035] Reference Figures 1 to 13A conical sieve tray for an absorption tower in a nitric acid plant includes a tray body 1 and positioning columns 12. A tray sieve 7 is installed inside the tray body 1 near the top surface. A base frame 5 is arranged in a linear array inside the tray body 1. A tray main beam 2 is located at the center of the tray body 1, and the bottom surface of the tray main beam 2 is bolted to the surface of the bottom base frame 5. Second beams 4 are bolted to the top surfaces of the base frames 5 on both sides of the tray body 1. A clamping and fixing plate 3 is bolted to the top surface of the tray body 1. A cooling coil 10 is provided between adjacent second beams 4. The clamping and fixing plate 3 is used to clamp and fix the cooling coil 10. Both the second beam 4 and the clamping plate 3 have limiting plates 11 on their sides that abut against the cooling coil 10. The tray body 1 serves as the core load-bearing structure, the tray sieve plate 7 is used for gas-liquid contact, and the base frame 5, the main tray beam 2, the second beam 4, and the clamping plate 3 form a supporting frame. The cooling coil 10 enters and exits from the outside to cool the medium temperature in the tray layer. The limiting plates 11 fix the position of the cooling coil 10. The tray sieve plate 7 allows gas to rise through its pores and contact the cooling medium, realizing the absorption process in the nitric acid unit. The base frame 5 and the main tray beam 2 inside the tray body 1 provide structural support, while the second beam 4 and the clamping plate 3 further enhance stability and distribute the force. The cooling coil 10 guides the cooling medium from the upper tray to the lower tray. The limiting plates 11 ensure the stability of the cooling coil 10 during operation and prevent displacement. Gas rises from below the tray through the pores of the tray sieve plate 7 and undergoes a mass transfer reaction with the cooling medium on the tray sieve plate 7. The cooling medium flows orderly down to the next tray through the cooling coil 10. The base frame 5, the main beam 2 of the tray, the second beam 4, and the clamping plate 3 jointly bear the force of the cooling medium and gas, ensuring the overall stable operation of the tray. The main beam 2 of the tray, the clamping plate 3, and the second beam 4, together with the base frame 5, form a multi-layer support structure, which improves the load-bearing capacity and deformation resistance of the tray. The reasonable layout of the tray sieve plate 7 and the cooling coil 10 optimizes the gas-liquid contact efficiency, and the bolted design facilitates assembly and maintenance.

[0036] The tray body 1 has an installation ring 9 near its bottom surface, and the tray sieve plate 7 has flow guide holes 8 on its surface. Figure 13As shown, the longitudinal section of the guide hole 8 is a combination of rectangle and trapezoid, and the spatial configuration of the guide hole 8 in the trapezoidal section is conical. The bottom of the 2 mm diameter hole is further processed with a taper. The setting of the taper area can remove the burrs of the machined holes of the tray, while increasing the smoothness of the gas phase channel, increasing the gas velocity through the sieve holes, and improving the gas-liquid two-phase reaction efficiency and the bubbling efficiency of the mixture. The edge of the tray sieve plate 7 is vertically bolted to the surface of the mounting ring 9. The mounting ring 9 is used to fix the tray sieve plate 7. The guide hole 8 promotes the gas to contact the cooling medium through the tray sieve plate 7. The vertical bolting ensures the tight connection between the tray sieve plate 7 and the tray body 1. The mounting ring 9 acts as a connector to fix the tray sieve plate 7 to the tray body 1. The guide hole 8 allows the gas to pass uniformly through the tray sieve plate 7, allowing for sufficient mass transfer reaction with the cooling medium to complete the absorption process. The gas rises from below the tray through the guide hole 8, while the cooling medium remains on the surface of the tray sieve plate 7 and comes into contact with the gas. The mounting ring 9 ensures the stability of the tray sieve plate 7 under the action of gas and liquid through bolting. The mounting ring 9 and bolting design enhance the stability of the tray sieve plate 7 and prevent displacement during operation. The design of the guide hole 8 improves the uniformity of gas distribution and enhances the absorption efficiency.

[0037] The top surfaces of the main beam 2 and the second beam 4 of the tower tray are coplanar. The bottom surface of the clamping and fixing plate 3 is bolted to both the second beam 4 and the top surface of the main beam 2. The distribution direction of the clamping and fixing plate 3 is parallel to the distribution direction of the main beam 2 of the tower tray. The main beam 2 and the second beam 4 of the tower tray provide horizontal support. The clamping and fixing plate 3 is distributed parallel to the main beam 2 of the tower tray, further dispersing the force and enhancing the overall rigidity. The coplanar top surfaces of the main beam 2 and the second beam 4 of the tower tray form a unified support plane. The clamping and fixing plate 3 is arranged parallel to the main beam 2 of the tower tray and is connected to the main beam 2 and the second beam 4 of the tower tray by bolting, forming a grid-like support structure to disperse the load on the tower tray. When the cooling medium and gas act on the tower tray, the main beam 2 of the tower tray bears the main longitudinal force, the second beam 4 provides auxiliary support, and the clamping and fixing plate 3 balances the transverse force through parallel distribution, ensuring that the overall force on the tower tray is uniform. The parallel beam structure makes the force on the tower tray more uniform and reduces local stress concentration. The coplanar design and bolting method optimize space utilization and facilitate installation and disassembly.

[0038] The second beam 4 is evenly distributed in a straight line array on both sides of the main beam 2 of the tower plate. The number of second beam 4 corresponds one-to-one with the number of scaffolding 5, and the spacing between the second beam 4 is the same as the spacing between the scaffolding 5. The corresponding distribution of the second beam 4 and the scaffolding 5 enhances the support consistency of the tower plate, and the even array distribution optimizes the load distribution. The second beam 4 is evenly arranged along both sides of the main beam 2 of the tower plate and corresponds one-to-one with the scaffolding 5. The same spacing design forms a regular support network, which transmits and disperses the force on the tower plate. The scaffolding 5 transmits the force at the bottom of the tower plate to the second beam 4, and the second beam 4 then evenly distributes the force to the main beam 2 of the tower plate, forming a stable mechanical transmission path. The matching design of the second beam 4 and the scaffolding 5 improves the coordination and stability of the structure, and the even distribution reduces the risk of local overload and extends the service life of the tower plate.

[0039] The side of the limiting plate 11 abuts against the side of the cooling coil 10, and both ends of the limiting plate 11 are bolted to the top surface of the second beam 4. The limiting plate 11 fixes the position of the cooling coil 10 to prevent it from shifting or shaking during operation. The limiting plate 11 restricts the lateral movement of the cooling coil 10 by contacting it from the side, and its two ends are bolted to the second beam 4 to ensure the stability of the limiting plate 11 itself. When the cooling medium flows through the cooling coil 10, the limiting plate 11 abuts against the cooling coil 10 to prevent displacement caused by the impact or vibration of the cooling medium, and to maintain the stability of the cooling medium flow path. The limiting plate 11 has The cooling coil 10 is fixed to ensure smooth flow of the cooling medium. The bolted design facilitates the installation and adjustment of the limiting plate 11. The cooling coil 10 is distributed in an S-shape between adjacent second beams 4. A supporting angle steel 6 perpendicular to the main beam 2 of the tray is welded between adjacent second beams 4, and the connection between the supporting angle steel 6 and the second beam 4 is plug welded. The S-shaped cooling coil 10 extends the flow path of the cooling medium, and the supporting angle steel 6 enhances the connection strength between the second beams 4. The S-shaped arrangement of the cooling coil 10 increases the residence time of the cooling medium in the tray and promotes gas-liquid contact. The supporting angle steel 6 is connected to the second beam 4 by plug weld. The beam 4 connection provides additional lateral support. The cooling medium flows along the S-shaped cooling coil 10, reacting fully with the rising gas. The supporting angle steel 6 forms a rigid connection between the second beams 4 to resist lateral deformation. The S-shaped cooling coil 10 extends the contact time of the cooling medium, enhancing the absorption effect. The supporting angle steel 6 and the plug weld improve the stability between the second beams 4. The clamping and fixing plate 3 near the inner wall of the tray body 1 and the second beam 4 are both welded to the inner wall of the tray body 1. The bottom surface of the clamping and fixing plate 3 abuts against the top surface of the main beam 2 of the tray. The welded connection strengthens the connection between the clamping and fixing plate 3 and the second beam 4 and the tray body. The overall integrity of the structure is further enhanced by the contact between the clamping and fixing plate 3 and the main beam 2 of the tower tray. The clamping and fixing plate 3 and the second beam 4 near the inner wall are integrated with the main body 1 of the tower tray through welding. The bottom surface of the clamping and fixing plate 3 abuts against the top surface of the main beam 2 of the tower tray, forming multi-point support to jointly bear the load. When the tower tray is running, the beams near the inner wall bear the edge stress through welding. The contact point between the clamping and fixing plate 3 and the main beam 2 of the tower tray disperses the top load and ensures the overall rigidity. Welding improves the deformation resistance of the tower tray edge. The contact design between the clamping and fixing plate 3 and the main beam 2 of the tower tray enhances the stability of the top structure. Specific Implementation Example 2:

[0041] Reference Figures 1 to 13 Based on the content of the above specific embodiments, the following content is further disclosed:

[0042] like Figure 1-4 The structure of each beam inside the main body of the tower plate shown is installed with the opening facing the side. In actual installation, the opening direction of each beam can be installed according to the actual use, such as opening upwards or downwards.

[0043] When using the tray body 1, corrosion-resistant, high-strength materials such as stainless steel should be selected for fabrication, including the tray body 1, main tray beam 2, second beam 4, clamping and fixing plate 3, and cooling coil 10. Surface treatment should be performed on the materials before welding and bolting to improve their resistance to nitric acid corrosion. When fabricating the U-shaped beam tray main beam 2, second beam 4, and clamping and fixing plate 3, it is necessary to ensure consistent cross-sectional dimensions and precise depth and width of the U-shaped grooves on the sides to guarantee accurate alignment during bolting and welding, avoiding assembly errors that could affect overall stability. When welding the supporting angle steel 6 to the second beam 4, and the clamping and fixing plate 3 and second beam 4 near the inner wall to the tray body 1, [further details are needed]. High-quality plug welding and full welding processes are used to ensure uniform welds without porosity, thereby enhancing structural rigidity. When machining and installing ring 9 and tray sieve plate 7, it is necessary to ensure that the bolt holes on the edges of both are precisely aligned, and the verticality is checked after assembly to avoid uneven stress on tray sieve plate 7 due to deviation. The side of the U-shaped beam has an open groove structure, with an open top, vertical walls on both sides, and a horizontal connecting surface at the bottom. This design increases the bending stiffness and load-bearing capacity of the beam while reducing weight. The U-shaped beam is formed by cold bending or extrusion, and the edges need to be ground smooth to avoid stress concentration. The bolt holes are pre-machined on the side walls or bottom to ensure precise matching with adjacent components during assembly.

[0044] In summary:

[0045] 1. The main body of the tray 1 is equipped with multiple S-shaped cooling coils 10 inside, which, together with the guide holes 8 on the surface of the tray sieve plate 7, form a unique liquid-gas interaction system. Compared with traditional straight cooling coils 10 or ordinary flat-hole trays, the S-shaped cooling coils 10 significantly extend the flow path of the cooling medium in the tray, allowing the cooling medium to have more time to contact the rising gas during the downward flow, promoting full mass transfer reaction. At the same time, the reasonable distribution of the guide holes 8 ensures that the gas can pass through the tray sieve plate 7 evenly, avoiding local airflow concentration or short-circuiting, further optimizing the uniformity of gas-liquid contact. It is particularly suitable for scenarios requiring high-efficiency absorption in nitric acid plants, accelerating the chemical reaction rate and increasing the output capacity of nitric acid per unit time, bringing higher economic benefits to industrial production, while reducing the material waste caused by insufficient mass transfer.

[0046] 2. A distributed grid support system consisting of the main tray beam 2, the second beam 4, and the clamping and fixing plate 3, along with the synergistic effect of the foot frame 5, the limiting plate 11, and the supporting angle steel 6, is constructed to create a multi-layered, highly rigid structural frame. The main tray beam 2 serves as the central support and is tightly connected to the evenly distributed second beam 4 and the foot frame 5 through bolts. The clamping and fixing plate 3 is arranged perpendicular to the main tray beam 2, forming a stable mechanical transmission network. This allows the tray to maintain structural integrity under high-intensity gas-liquid flow and pressure fluctuations, avoiding the deformation or even failure problems caused by local stress concentration or vibration in traditional trays. The high stability and durability significantly reduce the frequency of equipment maintenance and downtime, providing a reliable guarantee for the continuous and efficient operation of the nitric acid unit.

[0047] In this invention, unless otherwise explicitly 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 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 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.

[0048] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A conical sieve tray for an absorption tower in a nitric acid plant, comprising a tray body (1) and a positioning column (12), characterized in that: A tray sieve plate (7) is installed inside the tray body (1) near the top surface. A base frame (5) is arranged in a linear array inside the tray body (1). A tray main beam (2) is provided at the center of the tray body (1), and the bottom surface of the tray main beam (2) is bolted to the surface of the base frame (5) at the bottom. A second beam (4) is bolted to the top surface of the base frame (5) on both sides of the tray body (1). A pressing and fixing plate (3) is bolted to the top surface of the tray body (1). A cooling coil (10) is provided between adjacent second beams (4) and between adjacent pressing and fixing plates (3). A limiting plate (11) that abuts against the cooling coil (10) is provided on the side of both the second beam (4) and the pressing and fixing plate (3).

2. The conical sieve tray for an absorption tower in a nitric acid plant according to claim 1, characterized in that: The main body of the tray (1) is provided with an installation ring (9) near the bottom surface. The tray sieve plate (7) is provided with a flow guide hole (8). The edge of the tray sieve plate (7) is vertically bolted to the surface of the installation ring (9). The longitudinal section of the flow guide hole (8) is a combination of rectangle and trapezoid, and the spatial configuration of the flow guide hole (8) in the trapezoidal section is conical.

3. The conical sieve tray for an absorption tower in a nitric acid plant according to claim 1, characterized in that: The top surfaces of the main beam (2) and the second beam (4) of the tower plate are coplanar. The bottom surface of the clamping and fixing plate (3) is bolted to both the top surface of the second beam (4) and the main beam (2) of the tower plate. The distribution direction of the clamping and fixing plate (3) is parallel to the distribution direction of the main beam (2) of the tower plate.

4. The conical sieve tray for an absorption tower in a nitric acid plant according to claim 1, characterized in that: The second beam (4) and the main beam (2) of the tower plate are evenly distributed in a straight line array on both sides. The number of the second beam (4) corresponds one-to-one with the number of the base frame (5), and the spacing between the second beams (4) is the same as the spacing between the base frames (5).

5. The conical sieve tray for an absorption tower in a nitric acid plant according to claim 1, characterized in that: The side of the limiting plate (11) abuts against the side of the cooling coil (10), and both ends of the limiting plate (11) are bolted to the top surface of the second beam (4).

6. The conical sieve tray for an absorption tower in a nitric acid plant according to claim 1, characterized in that: The cooling coil (10) is distributed in an S-shape between adjacent second beams (4). A support angle steel (6) perpendicular to the main beam (2) of the tower plate is welded between adjacent second beams (4), and the connection between the support angle steel (6) and the second beam (4) is plug welded.

7. The conical sieve tray for an absorption tower in a nitric acid plant according to claim 1, characterized in that: The clamping and fixing plate (3) and the second beam (4) near the inner wall of the main body (1) of the tower tray are welded to the inner wall of the main body (1), and the bottom surface of the clamping and fixing plate (3) abuts against the top surface of the main beam (2) of the tower tray.

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