Structured packing limiting grating for small-diameter packed tower

Abstract

The utility model relates to the field of limiting grids, in particular to a structured packing limiting grid for a small-diameter packed tower, which comprises a grid A, a grid B, a grid C and a transmission element, a grating B and a grating C are respectively arranged at the left and right ends of the grating A; a transmission element is welded on the inner ring of the grating A; the transmission element comprises a bolt, a nut, a transmission rod, a top block and a positioning pin; according to the structure, the advantages that the height of an existing structure is adjustable and the like are continued, the defects of the existing structure are overcome, pressing force and operability are obviously improved, the outer circle of the grating is in direct contact with the tower wall, expansion is adopted, although friction force is also adopted, the force is multiplied compared with that of the existing structure due to the large contact area, and the effect is good. The defect that an existing structure is insufficient in pressing force is overcome. During use, the triangular structures of the two transmission rods and the nut are more stable, and looseness can be effectively prevented; the contact area with the tower wall is large, the pressure intensity is small, and the inner wall or the inner wall coating of the nonmetal tower cannot be damaged.

Description

Technical Field

[0001] This utility model relates to the field of limiting grids, and in particular to a structured packing limiting grid for small-diameter packed towers. Background Technology

[0002] The performance of packed towers largely depends on the regularity of the packing material; more precisely, the performance of the packing material is related to the uniformity of gas-liquid distribution across any cross-section of the tower. Therefore, the location of the packing material within the tower is crucial. Structured packing, as a type of packing material, is widely used in the chemical industry, especially in the fine chemical sector. Structured packing is installed in fixed positions within the packed tower. A support grid is designed at the bottom of the packing to support it, while a limiting grid is designed at the top to limit and compress the packing. The combination of these two features ensures the packing material remains fixed within the tower.

[0003] However, existing tower bodies are cylindrical. This design is for a structured packing limiting grid suitable for small-diameter packed towers, with a diameter ranging from 600mm to 150mm. Since personnel cannot enter these small-diameter packed towers, they need to be divided into several sections connected by flanges on the cylindrical body. Similarly, the packing is also divided into several sections to achieve different mass transfer requirements. Each section is typically higher than 1 meter, and some even exceed 6 meters. Therefore, the packing also needs to be divided into several discs at a certain height (usually 150-200mm / disc). Each disc is a single piece slightly smaller than the container diameter. During installation, it is fed into the tower through the connecting flange of the cylindrical section. Therefore, the design of the limiting grid typically needs to consider the following aspects:

[0004] 1) Firmness: The grid must be firm to limit and compress the packing material;

[0005] 2) Adjustability: The height of each packing disc will have a certain error, usually within ±1mm. When the packing is high, it is common for the top to have a deviation of ±10-20mm after accumulating several discs. Therefore, the grating must ensure that the height can be adjusted within a certain range to adapt to the position of the packing after installation.

[0006] 3) Easy to install: The structure should not be too complicated, the installation process should be simple and easy to understand, and due to the small container diameter and small installation space, it should also be easy to operate;

[0007] The grating is usually made of steel plate, with a common thickness of 3mm. Multiple grids are formed through welding to compress the packing material. In small-diameter packed towers, because each tray of regular packing is a single piece, no supports can be welded along the packing installation path. Therefore, the method of fixing the grating is a key and challenging aspect of the design. A commonly used design involves welding a fixing nut (usually M10) to the inner side of the outer circumference of the grating. The number of nuts is typically 3-6 per circumference. After the packing is in place, the grating is placed on top of the packing. Another nut is pre-screwed into the bolt, and then the bolt is screwed into the nut welded to the grating until it reaches the tower wall. By adjusting the depth of the bolts, the gap between the outer circumference of the grating and the tower wall is ensured to be uniform. After the bolt reaches the tower wall, further force is applied to tighten it, and finally, another nut is used to lock it in place. This structure uses the friction between the bolts and the tower wall to limit and compress the packing. It is simple in structure and its position is adjustable, hence its widespread use.

[0008] However, its shortcomings are also quite obvious, mainly in the following aspects:

[0009] 1) Insufficient clamping force: The grid mainly relies on the friction force generated after the bolts are tightened against the tower wall to limit the packing. Due to the small contact area, even with multiple bolts, the clamping force is very limited. If the equipment vibrates at the same time, the bolts may loosen. When the packed tower is running, the gas passes through the packing from bottom to top and transfers mass with the liquid phase in the packing. This process will generate a pressure drop. Different specifications of packing generate different resistances. At the same time, the higher the gas velocity, the greater the pressure drop. When the pressure drop is greater than the clamping force of the grid, the packing may be pushed up, which will cause operational failure.

[0010] 2) The bolt head and the tower wall are in point contact. In order to increase the contact area with the tower wall, some designs round the bolt head. Although this increases the clamping force to a certain extent, the increased pressure at the clamping point means that if the tower material is not metal, such as plastic material like PTFE, or if there is a coating on the inner wall of the tower, the tower body or tower coating will likely be damaged during installation. Therefore, the applicability of this structure is also very limited.

[0011] 3) Usually, at least three bolts are needed to ensure uniform tightening. Due to the presence of the grid, the space for bolt installation is very limited. The smaller the container diameter and the farther the grid is from the top flange, the more difficult or even impossible it is to install.

[0012] Therefore, to address the issues of insufficient clamping force of existing grids, damage to the tower body or tower coating during installation, and difficulties in grid installation, a structured packing limiting grid for small-diameter packed towers can be designed. Utility Model Content

[0013] To overcome the problems of insufficient clamping force of existing gratings, damage to the tower body or tower body coating during installation, and difficulty in grating installation.

[0014] The technical solution of this utility model is as follows: a structured packing limiting grid for a small-diameter packed tower, comprising grid A, grid B, grid C, and a transmission element; grid B and grid C are respectively provided at the left and right ends of grid A; a transmission element is welded to the inner ring of grid A; the transmission element includes bolts, nuts, transmission rods, top blocks, and positioning pins; bolts are installed inside the mounting holes of the grid A bracket; nuts are threaded onto the outside of the bolts; positioning pins are welded to the nuts at the positions corresponding to grid B and grid C; the outside of the positioning pins is connected to one end of the transmission rod; the other end of the transmission rod is connected to the top block.

[0015] Preferably, the transmission element comprises bolts, nuts, a transmission rod, a top block, and a locating pin.

[0016] By rotating the bolt, the nut can be moved up and down. First, screw the nut to the top and put in the other two movable grids B and C. The outer circles of grids B and C also contact the tower wall.

[0017] The following diagram shows that there are small gaps between the outer circles of grids A, B, and C and the tower wall. This is to clearly show the movement trajectory of the grids and the feasibility of the structure. In actual use, the outer circles of the grids can be directly positioned to contact the tower wall.

[0018] Rotate the bolt in the opposite direction to move the hexagonal nut downwards. A locating pin is welded to the outside of the nut and connected to a transmission rod. The other end of the transmission rod is connected to a top block. The up-and-down movement of the nut will cause the top block to move circumferentially until it contacts the inner circle of the grid. At this point, apply more force to rotate the top block, which will cause grids B and C to move along the normal towards the tower wall until the outer circles of grids A, B, and C are tightly fitted to the tower wall, and the installation is complete.

[0019] As a preferred embodiment, grilles A, B, and C are divided into three sections along the circumference; each of grilles A, B, and C is 120 degrees.

[0020] Preferably, the outer ring of the grille A is in close contact with the tower body and tower wall.

[0021] Preferably, grid A is placed on top of the structured packing stored inside the tower.

[0022] As a preferred option, hexagonal bolts are used; and special large-size hexagonal nuts are used.

[0023] Preferably, a cotter pin is installed at the lower end of the bolt to prevent it from detaching from the grid A bracket.

[0024] Preferably, cotter pins are installed on both sides of the locating pin to limit the position of the transmission rod and the top block.

[0025] The beneficial effects of this utility model are:

[0026] This utility model retains the advantages of existing structures, such as adjustable height, while overcoming their shortcomings. Both the clamping force and operability are significantly improved, as detailed below:

[0027] 1) The outer circle of the grid is in direct contact with the tower wall, and the expansion clamping is used. Although it is also a friction force, due to the large contact area, its force is many times greater than that of the existing structure, which solves the problem of insufficient clamping force of the existing structure; and the triangular structure of the two transmission rods and nuts is more stable during use, and can also effectively prevent loosening.

[0028] 2) It has a large contact area with the tower wall and low pressure, which will not damage the inner wall or inner wall coating of the non-metallic tower.

[0029] 3) Since the bolt is located in the center of the tower, it can be installed from outside the tower using a Y-shaped or T-shaped socket wrench. No special tools are required, making it convenient and quick. It can be used for towers of any diameter. Attached Figure Description

[0030] Figure 1 The diagram shown is a plan view of the limiting grille of this utility model;

[0031] Figure 2 The diagram shown is a three-dimensional structural schematic of the limiting grille of this utility model;

[0032] Figure 3 The diagram shown is a schematic representation of the transmission element structure of the limiting grille of this utility model.

[0033] Figure 4 The diagram shown is a schematic diagram of the installation of two movable grids B and C in the limiting grid of this utility model.

[0034] Figure 5 The diagram shown is a general installation schematic of the limiting grille of this utility model.

[0035] Explanation of reference numerals in the attached drawings: 1. Grille A; 2. Grille B; 3. Grille C; 4. Transmission element; 5. Tower body; 8. Bolt; 9. Nut; 10. Transmission rod; 11. Top block; 12. Locating pin; 13. Cotter pin. Detailed Implementation

[0036] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0037] Please see Figure 1-5This utility model provides an embodiment: a structured packing limiting grid for a small-diameter packed tower, including grid A1, grid B2, grid C3, and transmission element 4; grid B2 and grid C3 are respectively provided at the left and right ends of grid A1; transmission element 4 is welded to the inner ring of grid A1; transmission element 4 includes bolt 8, nut 9, transmission rod 10, top block 11, and positioning pin 12; bolt 8 is installed inside the mounting hole of grid A1 bracket; nut 9 is threaded to the outside of bolt 8; positioning pin 12 is welded to nut 9 at the positions corresponding to grid B2 and grid C3; the outside of positioning pin 12 is connected to one end of transmission rod 10; the other end of transmission rod 10 is connected to top block 11; the outer ring of grid A1 is tightly attached to the tower wall of tower body 5; grid A1 is placed on the upper end of the structured packing stored in tower body 5.

[0038] Please see Figure 3 In this embodiment, bolt 8 is a hexagonal bolt; nut 9 is a special large-size hexagonal nut; a cotter pin 13 is installed at the lower end of bolt 8 to prevent bolt 8 from detaching from the grid A1 bracket; cotter pins 13 are installed on both sides of positioning pin 12 to limit the position of transmission rod 10 and top block 11.

[0039] Please see Figure 4 In this embodiment, grilles A1, B2, and C3 are divided into three circumferences; each of grilles A1, B2, and C3 is 120 degrees.

[0040] The transmission element 4 consists of a bolt 8, a nut 9, a transmission rod 10, a top block 11, and a locating pin 12.

[0041] When working, rotating bolt 8 can drive nut 9 to move up and down. First, screw nut 9 to the top and put in two other movable grids B2 and C3. The outer circles of grids B2 and C3 also contact the tower wall.

[0042] The following diagram shows that there are small gaps between the outer circles of grids A1, B2, and C3 and the tower wall of tower body 5. This is to clearly show the movement trajectory of the grids and the feasibility of the structure. In actual use, the outer circles of the grids can be directly positioned to contact the tower wall of tower body 5.

[0043] Rotate bolt 8 in the opposite direction to move hexagonal nut 9 downward. Locating pin 12 is welded to the outside of nut 9 and connected to transmission rod 10. The other end of transmission rod 10 is connected to top block 11. In this way, the up and down movement of nut 9 will drive top block 11 to move circumferentially until it contacts the inner circle of the grid. At this time, apply more force to rotate, and top block 11 will drive grids B2 and C3 to move along the normal towards the tower wall until the outer circles of grids A1, B2, and C3 are tightly pressed against the tower wall, and the installation is completed.

Claims

1. A regular packing limiting grid for regular packing of a small diameter packed column, comprising a grid A (1); characterized in that: It also includes the grid B (2), the grid C (3), transmission element (4); the grid A (1) left and right two ends are respectively provided with the grid B (2) and the grid C (3); the inner ring of the grid A (1) is welded with the transmission element (4); the transmission element (4) includes bolt (8), nut (9), transmission rod (10), top block (11) and positioning pin (12); the inside of the grid A (1) support mounting hole is installed with bolt (8); the outside of the bolt (8) is connected with nut (9); the nut (9) is welded with positioning pin (12) at the corresponding position of the grid B (2) and the grid C (3); the outside of the positioning pin (12) is connected with one end of the transmission rod (10); the other end of the transmission rod (10) is connected with the top block (11).

2. The regular-shaped packing limiting grid for small-diameter packed column according to claim 1, characterized in that: The grid A (1), the grid B (2) and the grid C (3) are divided into three blocks according to the circumference; the grid A (1), the grid B (2) and the grid C (3) are each 120 degrees.

3. The regular-shaped packing limiting grid for small diameter packed column according to claim 1, characterized in that: The outer ring of the grid A (1) is closely attached to the tower wall of the tower body (5).

4. The limiting grid for the structured packing of a small diameter packed column according to claim 1, characterized in that: The grid A (1) is placed on the upper end of the structured packing stored in the tower body (5).

5. The limiting grid for the structured packing of small diameter packed column according to claim 1, characterized in that: The bolt (8) adopts a hexagonal bolt; the nut (9) adopts a special large-size hexagonal nut.

6. The limiting grid for the structured packing of a small diameter packed column according to claim 1, characterized in that: The lower end of the bolt (8) is installed with split pin (13) to prevent the bolt (8) from separating from the grid A (1) support.

7. The limiting grid for the structured packing of small diameter packed column according to claim 1, characterized in that: The positioning pin (12) is installed with split pin (13) on both sides to limit the position of the transmission rod (10) and the top block (11).

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