A foam ceramic wire mesh demister used in a sulfuric acid tower

Abstract

The present invention discloses a foam ceramic wire mesh demister for use in a sulfuric acid tower, which comprises a frame body, a plurality of foam ceramic wire mesh monomers arranged in the frame body, and a frame body for pressing the foam ceramic wire mesh monomers. The frame body comprises a cylinder body, a square grid and a special-shaped grid. The square grid is divided into square cavities, and the special-shaped grid is divided into two special-shaped cavities. A square foam ceramic wire mesh assembly and a special-shaped foam ceramic wire mesh assembly are respectively inserted into the square cavities and the special-shaped cavities from top to bottom. S-shaped separation plates are arranged at intervals at positions corresponding to the square cavities in the pre-separation cavity. The structure of the present invention is compact and convenient to manufacture, effectively solving the problems of the existing one being troublesome to disassemble and assemble, time-consuming and laborious, affecting the production time for a long time, and reducing the production efficiency. It improves the compressive strength and corrosion resistance of the foam ceramic wire mesh used as a demister, has good durability, increases the service life, which can reach more than 5 years, and the price is relatively reduced by 30%-40%.

Description

Technical Field

[0001] The present invention relates to a separation column, and in particular to a foamed ceramic wire mesh demister for being arranged on the upper part of a sulfuric acid column. Background Art

[0002] In industries such as chemical engineering and petroleum, demisters are mainly used for gas-liquid separation in separation columns such as rectifying columns and absorption columns in the above industries. Its function is to remove the liquid droplets entrained in the secondary steam that continues to rise after the gas (primary steam) exchanges with the liquid medium layer, prevent the loss of useful products or pollution, ensure mass transfer efficiency, reduce the loss of valuable materials, improve the operation of the compressor behind the column, reduce the water content, extend the life of the compressor, and generally a demister is arranged at the top of the column. It can effectively remove fog droplets of 3 - 5 μm. If a demister is arranged between trays, it can not only ensure the mass transfer efficiency of the trays, but also reduce the tray spacing. Its demisting principle is: when the gas with fog droplets rises through the wire mesh at a certain speed, due to the inertial action of the rising fog droplets, the fog droplets collide with the fine wires of the wire mesh and are attached to the surface of the fine wires. The diffusion of the fog droplets on the surface of the fine wires and the gravitational settlement of the fog droplets cause the fog droplets to form larger liquid droplets and flow along the fine wires to the intersection point of two wires. The wettability of the fine wires, the surface tension of the liquid, and the capillary action of the fine wires make the liquid droplets become larger and larger until the gravity generated by the aggregated liquid droplets exceeds the resultant force of the upward force of the gas and the surface tension of the liquid, and then the liquid droplets separate and fall from the fine wires. After the gas passes through the wire mesh demister, it basically contains no fog droplets.

[0003] By separating the fog droplets in the gas through the demister, the operating conditions of the tower equipment can be improved, the process indexes can be optimized, equipment corrosion can be reduced, the service life of the equipment can be extended, the processing capacity can be increased, valuable materials can be recovered, the environment can be protected, and air pollution can be reduced, etc.

[0004] Currently, the commonly used demisters mainly include baffle demisters, cyclone demisters, and wire mesh demisters. Only comparing the demisting efficiency, except for baffle demisters and cyclone demisters, the most commonly used in medium and small tower equipment is the wire mesh demister. The wire mesh demister is formed by laminating metal wire meshes into a disc-shaped body with a height of 100 - 150 mm, then placing the disc-shaped body in an outer ring and clamping it into a whole with screws of many pressing plates, and then installing and fixing the whole in the tower equipment. Although it has the characteristics of simple structure, small volume, light weight, low price, and high demisting efficiency, it still has the following problems in use: First, most of the wire meshes are made of stainless steel, and its corrosion resistance is not high, and the service life generally does not exceed 2 years; second, it can only be used once and cannot be recycled; third, the existing wire mesh demister is integrally manufactured and installed and fixed in the tower equipment, and when replacing, it needs to be disassembled and assembled as a whole, which is troublesome, time-consuming and laborious, affects the production time for a long time, and reduces the production efficiency. Summary of the Invention

[0005] In view of the following two technical problems of wire mesh demisters in the above-mentioned prior art: First, the corrosion resistance is not high, and the service life generally does not exceed 2 years; second, the wire mesh demister is integrally manufactured and installed and fixed in the tower equipment. When replacing, a lot of pressing plates and screws need to be disassembled and assembled as a whole, which is troublesome, time-consuming and laborious, affects the production time for a long time, and reduces the production efficiency. The present invention provides a demister composed of a plurality of foam ceramic monomers, which is not only corrosion-resistant, high-strength, structurally compact, light in weight, low in price, and high in demisting efficiency, but also has a long service life, is quick and convenient to disassemble and assemble, time-saving and labor-saving.

[0006] The technical solutions adopted by the present invention to solve the above two technical problems are as follows: A foam ceramic wire mesh demister used in a sulfuric acid tower, which includes a frame body, a plurality of foam ceramic wire mesh monomers arranged in the frame body, and a frame body for pressing the foam ceramic wire mesh monomers. The foam ceramic wire mesh is first made into a slurry by ball-milling and mixing 5-10wt% of nano-scale silicon carbide, 25-40wt% of silica powder, 25-40wt% of alumina powder, 5-10wt% of kaolin, 3-5wt% of silica sol, 2-5wt% of polycarboxylate, 5-10wt% of nano iron-carbon powder and an appropriate amount of water, and then the polyurethane sponge is impregnated in the slurry, and is formed by extrusion, drying and high-temperature firing; the frame body includes a cylinder body, a square grid fixedly connected to the cylinder body, and a special-shaped grid located around the square grid. The square grid is divided into a number of square cavities by inner horizontal bars and inner vertical bars in parallel or staggered. The special-shaped grid is divided into two special-shaped cavities by side grid bars. Inner support edges are provided at the lower ends of the inner sides of the inner horizontal bars and inner vertical bars. Outer support edges are provided at the lower ends of the inner sides of the side grid bars and annular grid bars. The square cavities are horizontally arranged, and the special-shaped cavities are inclined. A pre-separation cavity is formed between the square cavities, the special-shaped cavities and the cylinder body. Square foam ceramic wire mesh assemblies and special-shaped foam ceramic wire mesh assemblies are respectively inserted into the square cavities and the special-shaped cavities from top to bottom. S-shaped separation plates are arranged at intervals at positions corresponding to the square cavities in the pre-separation cavity, and outer folding plates are arranged at intervals at positions corresponding to the special-shaped cavities in the pre-separation cavity; the frame body includes a rotating shaft movably arranged at both ends on a support seat fixed on the cylinder body. On both sides of the rotating shaft, there are respectively connected with pressing rods I that can press the square foam ceramic wire mesh assembly and the special-shaped foam ceramic wire mesh assembly through swing arms. On one side of the pressing rod I, there is a connecting rod connecting a pressing rod II that can press the square foam ceramic wire mesh assembly and the special-shaped foam ceramic wire mesh assembly. The pressing rod II is connected with an outer pressing rod in a bent shape, and the outer pressing rod can press the special-shaped foam ceramic wire mesh assembly.

[0007] The square ceramic foam wire mesh assembly includes a square basket body formed by welding a right-angle plate with an inner support plate at the lower end, a cross plate and a connecting plate connecting the upper and lower ends of the right-angle plate, and a square ceramic foam wire mesh movably arranged in the square basket body. A lifting lug is arranged on the cross plate; the special-shaped ceramic foam wire mesh assembly includes a corner plate with an outer support plate at the lower end and a special-shaped basket body formed by an arc-shaped corner plate, and a special-shaped ceramic foam wire mesh movably arranged in the whole body. A lifting lug is arranged on the corner plate.

[0008] In the raw materials used for the ceramic foam wire mesh of the present invention, firstly, due to the inclusion of nano silicon carbide, under the same conditions, the compressive strength of the ceramic foam body can be increased by 20-30%, and its impact resistance, wear resistance and corrosion resistance can be improved; secondly, due to the inclusion of nano iron-carbon powder, the specific surface area of the matrix can be increased, and the adsorption capacity of liquid droplets can be improved in water treatment and gas-liquid impurity separation, which is beneficial to separating more organic pollutants and metal ions from the liquid droplets.

[0009] In the technical solution of the present invention, in order to improve the overall strength and rigidity of the demister, the demister is made by using the prior art process and is composed of a ceramic foam body and a steel frame body as a monomer; in order to facilitate combination, reduce the types of combined bodies and facilitate the manufacture of combined bodies; the demister is divided into an internal square ceramic foam wire mesh composed of several identical squares and a special-shaped ceramic foam wire mesh formed by its outer sides, and the upward extraction method can be used for random maintenance and rapid replacement. In order to ensure that the demister does not move upward, the two ends are rotated successively to one side around the rotating shaft at the middle position, so that the three rows of pressing rods on one side of the rotating frame body can be rotated to one side and pressed on the square ceramic foam wire mesh assembly and the special-shaped ceramic foam wire mesh assembly on the same side at the same time. Thus, the problem in the prior art that many pressing plates and screws need to be disassembled and assembled integrally, the replacement is troublesome, time-consuming and laborious, the production time is affected for a long time, and the production efficiency is reduced is solved at one stroke, and the installation and replacement efficiency is improved;

[0010] The present invention has the following beneficial effects compared with the prior art:

[0011] 1. By adjusting the raw material composition of the ceramic foam, compared with the existing stainless steel wire mesh demister, the compressive strength and corrosion resistance of the ceramic foam body wire mesh used as a demister are improved, the durability is good, the service life is increased, the service life can reach more than 5 years, and the price is relatively reduced by 30%-40%.

[0012] 2. The existing wire mesh demister is troublesome to disassemble and assemble integrally, time-consuming and laborious, affects the production time for a long time, and reduces the production efficiency. It is changed to be able to randomly remove or install one by one monomer upward or insert downward on the tower equipment, effectively solving the problems of troublesome disassembly and assembly, time-consuming and laborious, affecting the production time for a long time, and reducing the production efficiency in the prior art.

[0013] 3. Since the stainless steel wire mesh in the wire mesh demister is laminated, and the wire mesh itself is relatively soft and has low strength, the frame for storing the wire mesh in the prior art needs to have high strength to ensure the strength of the wire mesh demister. Therefore, in contrast, the frame structure of the present invention is simpler, lighter in weight, and lower in manufacturing cost.

[0014] 4. In the present invention, since the special-shaped ceramic foam wire mesh is inclinedly connected to the square ceramic foam wire mesh, a pre-separation chamber with a bent separation plate provided with S-shaped separation plates at intervals can be formed between the special-shaped ceramic foam wire mesh and the square ceramic foam wire mesh. After the secondary steam with droplets after gas-liquid exchange enters the flow channel, it will continuously collide with the separation plates, so that part of the entrained droplets in the secondary steam can be removed in the pre-separation chamber before entering the ceramic foam wire mesh (the separated droplets enter the medium downward and contact the primary steam), reducing the separation pressure of the ceramic foam wire mesh on the droplets in the secondary steam. This can not only improve the effect of separating droplets in the secondary steam, but also increase the service life of the ceramic foam wire mesh. The ceramic foam wire mesh demister of the present invention has a trapping efficiency of 98%-99.8% for mist droplets with a particle size of ≥3-5 μm. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a top view structural diagram of the present invention,

[0016] Figure 2 is Figure 1 the A-A cross-sectional structural diagram of

[0017] Figure 3 is Figure 1 the B-B partial cross-sectional structural diagram of

[0018] Figure 4 is Figure 2 the C-direction partial structural diagram of

[0019] Figure 5 is the front view structural diagram of the special-shaped ceramic foam wire mesh assembly,

[0020] Figure 6 is the top view structural diagram of the special-shaped ceramic foam wire mesh assembly,

[0021] Figure 7 is the front view structural diagram of the square ceramic foam wire mesh assembly,

[0022] Figure 8 is the top view structural diagram of the square ceramic foam wire mesh assembly,

[0023] Figure 9 is the left view structural diagram of the square ceramic foam wire mesh assembly.

[0024] In the figure, 1. cylinder body; 2. inner straight bar; 3. connecting rod; 4. inner cross bar; 5. pressing rod I; 6. rocker arm; 7. support seat; 8. rotating shaft; 9. pressing rod II; 10. square cavity; 11. reinforcing body; 12. square grille; 13. outer pressing rod; 14. special-shaped cavity; 15. outer support edge; 16. outer through port; 17. outer folding plate; 18. inner support edge; 19. inner through port; 20. S-shaped separation plate; 21. flow channel; 22. rod plate; 23. lifting lug; 24. pressing screw; 25. annular strip; 26. edge grille strip; 5-1. outer support plate; 5-2. special-shaped ceramic foam wire mesh; 5-3. arc-shaped corner plate; 5-4. corner plate; 6-1. cross plate; 6-2. right-angle plate; 6-3. inner support plate; 6-4. connecting plate; 6-5. square foam ceramic wire mesh. Detailed implementation mode

[0025] In the figure, a foam ceramic wire mesh demister used in a sulfuric acid tower includes a frame body, several foam ceramic wire mesh monomers arranged in the frame body, and a frame body for pressing the foam ceramic wire mesh monomers. The foam ceramic wire mesh is first made into a slurry by ball-milling and mixing 5-10wt% of nano-scale silicon carbide, 25-40wt% of silica powder, 25-40wt% of alumina powder, 5-10wt% of kaolin, 3-5wt% of silica sol, 2-5wt% of polycarboxylate, 5-10wt% of nano iron-carbon powder and an appropriate amount of water. Then, a polyurethane sponge is impregnated in the slurry and formed into the wire mesh through extrusion, drying and high-temperature firing. The nano iron-carbon powder is made by dissolving iron nitrate and carbon powder in deionized water according to a ratio, and then heating, concentrating and decomposing. The nano iron-carbon powder has a strong effect of adsorbing impurities during water treatment and gas-liquid separation. The frame body includes a cylinder body 1, a square grid 12 fixedly connected to the cylinder body, and four special-shaped grids located around the square grid. The square grid is divided into nine square cavities 10 (or 4 square cavities, or six square cavities) that are parallel or staggered with each other by inner horizontal bars 4 and inner vertical bars 2. The four corners of the square grid are connected to the cylinder body through reinforcing bodies 11. The special-shaped grid is divided into two special-shaped cavities 14 by side grid bars 26. Inner support edges 18 are arranged at the lower ends of the inner sides of the inner horizontal bars and inner vertical bars. Outer support edges 15 are arranged at the upper ends of the inner sides of the side grid bars and an annular bar 25 fixed on the cylinder wall. The square cavities are arranged horizontally and flush with each other. The special-shaped cavities are arranged obliquely. A pre-separation cavity is formed between the square cavities, the special-shaped cavities and the cylinder body. Square foam ceramic wire mesh assemblies and special-shaped foam ceramic wire mesh assemblies are respectively inserted into the square cavities and the special-shaped cavities from top to bottom. S-shaped separation plates 20 are arranged at intervals at positions corresponding to the square cavities in the pre-separation cavity. Outer folding plates 17 are arranged at intervals at positions corresponding to the special-shaped cavities in the pre-separation cavity. The lower ends of the S-shaped separation plates 20 and the outer folding plates 17 are fixed on spaced rod plates 22, and the upper ends are connected to inner support plates. Both ends of the rod plates are fixed on the cylinder body. The frame body includes a rotating shaft 8 whose two ends are movably arranged on support seats 7 fixed on the cylinder body. On both sides of the rotating shaft, pressure rods I 5 that can press the square foam ceramic wire mesh assemblies and the special-shaped foam ceramic wire mesh assemblies are respectively connected through swing arms 6. On one side of the pressure rod I, a pressure rod II 9 that can press the square foam ceramic wire mesh assemblies and the special-shaped foam ceramic wire mesh assemblies is connected through a connecting rod 3. The pressure rod II is connected with a bent outer pressure rod 13, and the outer pressure rod can press the special-shaped foam ceramic wire mesh assemblies with a compression screw 24 (or other latches).

[0026] The square ceramic foam wire mesh assembly includes a square basket body formed by welding a cross plate 6-1 and a connecting plate 6-4 that connect the upper and lower ends of a right-angle plate 6-2 with an inner support plate 6-3 at the lower end, and a square ceramic foam wire mesh 6-5 movably arranged in the square basket body. A lifting lug 23 is arranged on the cross plate (facilitating manual extraction of the square ceramic foam wire mesh assembly with a hook); the special-shaped ceramic foam wire mesh assembly includes a special-shaped basket body formed by a corner plate 5-4 with an outer support plate 5-1 at the lower end and an arc-shaped corner plate 5-3, and a special-shaped ceramic foam wire mesh 5-2 movably arranged in the basket body. A lifting lug 23 is arranged on the corner plate. The porosity of the square ceramic foam wire mesh assembly and the special-shaped ceramic foam wire mesh assembly is greater than 50%, and the foam pore size is 100-200 mesh.

[0027] During installation, first fix the frame body at the upper part inside the sulfuric acid tower, then open one side of the frame body, and then insert the square ceramic foam wire mesh assembly and the special-shaped ceramic foam wire mesh assembly vertically downward into the square cavity and the special-shaped cavity respectively, and make the inner support plate 6-3 on the square ceramic foam wire mesh assembly press on the inner support edge 18 in the square cavity, and the outer support plate 5-1 on the special-shaped ceramic foam wire mesh assembly press on the outer support edge 15 in the special-shaped cavity. There is an outer through port 16 between the special-shaped ceramic foam wire mesh assembly and the pre-separation chamber, and an inner through port 19 between the square ceramic foam wire mesh assembly and the pre-separation chamber. Flow channels 21 are formed between the S-shaped separation plates and the outer folding plates in the pre-separation chamber. The widths of the inner support plate, the outer support plate, the outer support edge, and the inner support edge are all 10-20 mm.

Claims

1. A foam ceramic wire mesh demister used in a sulfuric acid tower, characterized in that: It includes a frame body, several foam ceramic wire mesh monomers arranged in the frame body, and a frame body for pressing the foam ceramic wire mesh monomers. The foam ceramic wire mesh is first made into a slurry by ball-milling and mixing 5-10wt% of nano-scale silicon carbide, 25-40wt% of silica powder, 25-40wt% of alumina powder, 5-10wt% of kaolin, 3-5wt% of silica sol, 2-5wt% of polycarboxylate, 5-10wt% of nano iron-carbon powder and an appropriate amount of water. Then, a polyurethane sponge is impregnated in the slurry and formed into the foam ceramic wire mesh through extrusion, drying and high-temperature firing. The frame body includes a cylinder body (1), a square grille (12) fixedly connected to the cylinder body, and four special-shaped grilles located around the square grille. The square grille is divided into several parallel or staggered square cavities (10) by inner horizontal bars (4) and inner vertical bars (2). The special-shaped grille is divided into two special-shaped cavities by side grille bars (26). Inner support edges (18) are arranged at the lower ends of the inner sides of the inner horizontal bars and inner vertical bars. Outer support edges (15) are arranged at the lower ends of the inner sides of the side grille bars. The square cavities are horizontally arranged, and the special-shaped cavities are inclinedly arranged. A pre-separation cavity is formed between the square cavities, the special-shaped cavities and the cylinder body. Square foam ceramic wire mesh assemblies and special-shaped foam ceramic wire mesh assemblies are respectively inserted into the square cavities and the special-shaped cavities from top to bottom. S-shaped separation plates (20) are arranged at intervals at positions corresponding to the square cavities in the pre-separation cavity. Outer folding plates (17) are arranged at intervals at positions corresponding to the special-shaped cavities in the pre-separation cavity. The frame body includes a rotating shaft (8) whose two ends are movably arranged on support seats (7) fixed on the cylinder body. On both sides of the rotating shaft, pressing rods I (5) capable of pressing the square foam ceramic wire mesh assembly and the special-shaped foam ceramic wire mesh assembly are respectively connected through swing arms (6). On one side of the pressing rod I, a pressing rod II (9) capable of pressing the square foam ceramic wire mesh assembly and the special-shaped foam ceramic wire mesh assembly is connected through a connecting rod (3). The pressing rod II is connected with a bent outer pressing rod (13), and the outer pressing rod can press the special-shaped foam ceramic wire mesh assembly. The square foam ceramic wire mesh assembly includes a square basket body welded and combined by a right-angle plate (6-2) with an inner support plate (6-3) at the lower end, a horizontal plate (6-1) connecting the upper and lower ends of the right-angle plate, and a connecting plate (6-4), and a square foam ceramic wire mesh (6-5) movably arranged in the square basket body. Lifting lugs (23) are arranged on the horizontal plate. The porosity of the square foam ceramic wire mesh assembly and the special-shaped foam ceramic wire mesh assembly is greater than 50%, and the foam pore size is 100-200 mesh.

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