A wire mesh cooler for sodium methoxide production

Abstract

A wire mesh cooler for sodium methoxide production belongs to the field of chemical reaction cooling technology, comprising an upper wire mesh cover, a lower wire mesh cover, a frame, and a wire mesh layer, wherein the upper wire mesh cover and the lower wire mesh cover are respectively arranged at the top and the bottom of the frame, wherein a plurality of wire mesh layers are arranged inside the frame, wherein the plurality of wire mesh layers are arranged horizontally rotated 0-90°, wherein the wire mesh layer has wavy or sawtooth-shaped protrusions staggered horizontally and vertically, wherein the wire mesh layer is a double-layer structure with a circulation channel inside, and spherical wire mesh protrusions connected to the internal channel of the wire mesh layer are evenly arranged on the wavy or sawtooth-shaped protrusions of the wire mesh layer. The cooler adopts a staggered wavy anti-corrosion wire mesh layer structure cooler to achieve the purpose of cooling and refluxing the hot steam in the sodium methoxide production process without cooling water.

Description

Technical Field

[0001] The invention belongs to the technical field of chemical reaction cooling, and in particular relates to a wire mesh cooler used for sodium methoxide production. Background Art

[0002] In the production process of sodium methoxide, it is necessary to cool and reflux the hot steam in the reaction. Usually, a cooler such as a shell-and-tube heat exchanger that requires a large amount of circulating cooling water as a medium is used for cooling. However, since the hot steam in the production process of sodium methoxide is alkaline and highly corrosive, it is easy to scale inside the shell-and-tube heat exchanger and cause corrosion outside the shell-and-tube heat exchanger, shortening the service life of the heat exchanger. In addition, the existing shell-and-tube heat exchanger requires a large amount of circulating cooling water and consumes a lot of water. In some areas where water resources are scarce, industrial water is very tight, and this cooler using a large amount of circulating cooling water is not suitable for local production. Furthermore, for areas with high water hardness, the calcium and magnesium ion content in the water is high. If a common shell-and-tube heat exchanger is used, it is easy to scale, which causes great damage to the cooler and has low cooling efficiency. Summary of the invention

[0003] In view of the above-mentioned shortcomings and deficiencies of the prior art, the present invention provides a wire mesh cooler for the production of sodium methoxide, which adopts a staggered wavy anti-corrosion wire mesh layer structure cooler to achieve the purpose of cooling and refluxing the hot steam in the production process of sodium methoxide without cooling water.

[0004] In order to achieve the above object, the present invention adopts the following technical solution:

[0005] A wire mesh cooler for sodium methoxide production comprises an upper wire mesh cover, a lower wire mesh cover, a frame and a wire mesh layer. The upper wire mesh cover and the lower wire mesh cover are respectively arranged at the top and the bottom of the frame. A plurality of wire mesh layers are arranged inside the frame. The plurality of wire mesh layers are arranged horizontally rotated 0-90 degrees. The wire mesh layer has wavy or sawtooth-shaped protrusions that are staggered horizontally and vertically. The wire mesh layer is a double-layer structure with a circulation channel inside. Spherical wire mesh protrusions that are connected to the internal channel of the wire mesh layer are evenly arranged on the wavy or sawtooth-shaped protrusions of the wire mesh layer.

[0006] Furthermore, a plurality of wire mesh layers are separated from top to bottom by a spacing layer grid, and the spacing layer grid and the frame fix the wire mesh layers.

[0007] Furthermore, the material of the upper wire mesh cover, the lower wire mesh cover, the wire mesh layer and the spacer layer grid is one or more of 304, 304L, 316L, 321, 310, 317 stainless steel; PP / polypropylene; glass fiber blend; PE / polyethylene; PTFE / polytetrafluoroethylene; F46 / polyperfluoroethylene propylene; monel alloy; pure nickel wire; and pure titanium wire.

[0008] Furthermore, the angle between the hypotenuse of the wavy or sawtooth protrusions of the wire mesh layer and the horizontal direction is 30-45°.

[0009] Furthermore, the plurality of screen layers are horizontally rotated 5-45°.

[0010] Furthermore, the ratio of the height of a single wire mesh layer to the diameter of the wire mesh cooler is 1:7-2:5.

[0011] The beneficial effects of the present invention are:

[0012] 1. The wire mesh cooler of the present invention is provided with several layers of wire mesh with criss-cross wavy or zigzag protrusions, on which spherical wire mesh protrusions are evenly distributed. The wire mesh is a double-layer structure with circulation space reserved therein. Several layers of wire mesh are arranged horizontally rotated at a certain angle from top to bottom to improve the mass transfer and heat transfer efficiency. The small space formed between the wire mesh layers can increase the residence time of water vapor on the one hand, and more importantly, the contraction of the space can increase the probability of water vapor forming droplets, thereby improving the water recovery rate.

[0013] 2. The wire mesh cooler of the present invention adopts anti-corrosion material to make the wire mesh structure. The hot steam condenses into droplets when encountering the wire mesh of the wire mesh cooler and refluxes. Condensate water is completely unnecessary, which saves a large amount of industrial water and costs. It avoids the scaling and corrosion problems caused by high-hardness tap water to conventional condensers. Compared with conventional shell-and-tube heat exchangers, it has a long service life.

[0014] 3. The angle between the beveled edge of the wave-shaped or sawtooth-shaped protrusion of the screen layer and the horizontal direction is 30-45 degrees. The beveled edge of the wave-shaped or sawtooth-shaped protrusions between each screen layer is matched with the inclination angle to block the hot steam and prevent the hot steam from escaping. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic structural diagram of a single-layer wire mesh cooler of the present invention;

[0016] Figure 2 It is a schematic diagram of the top view structure of a single-layer wire mesh;

[0017] Figure 3 This is a picture of the external structure of the wire mesh cooler of the present invention.

[0018] Components in the figure: 1 is the upper screen cover, 2 is the lower screen cover, 3 is the frame, 4 is the screen layer, and 4-1 is the spherical screen protrusion. DETAILED DESCRIPTION

[0019] In order to better explain the present invention and facilitate understanding, the present invention is described in detail below through specific implementation modes in conjunction with the accompanying drawings.

[0020] The present invention discloses a wire mesh cooler for sodium methoxide production, which is used for condensation and reflux of hot steam in sodium methoxide production when it encounters the wire mesh of the wire mesh cooler. The cooler does not need to use condensed water for cooling, but relies on the low temperature of the wire mesh itself and the low temperature of the hot steam converted into liquid to achieve reflux. Condensed water is not needed at all, a large amount of water resources is saved, and the scaling and corrosion problems caused by high-hardness tap water to conventional condensers are avoided.

[0021] like Figure 1-3 As shown, the wire mesh cooler of the present invention comprises an upper wire mesh cover 1, a lower wire mesh cover 2, a frame 3, and a wire mesh layer 4. The upper wire mesh cover 1 and the lower wire mesh cover 2 are respectively arranged at the top and the bottom of the frame 3. A plurality of wire mesh layers 4 are arranged inside the frame 3. The plurality of wire mesh layers 4 are arranged horizontally rotated 0-90°. The staggered arrangement helps to increase the contact area between the hot steam and the wire mesh and prevent the hot steam from escaping. The wire mesh layer 4 has wavy or serrated protrusions that are staggered horizontally and vertically. The wire mesh layer 4 is a double-layer structure with a flow channel inside. The wavy or serrated protrusions of the wire mesh layer 4 are evenly arranged with spherical wire mesh protrusions 4-1 that are connected to the internal channel of the wire mesh layer 4, thereby increasing the contact area between the wire mesh and the hot steam and increasing the resistance of the hot steam between the wire mesh layers.

[0022] Several layers of wire mesh 4 are separated from top to bottom by the spacer layer grid frame, and the spacer layer grid frame and the frame 3 fix the wire mesh 4. Several layers of wire mesh 4 are horizontally rotated 5-45 degrees to increase the contact area between the wire mesh and the hot steam, and increase the resistance of the hot steam between the wire mesh layers.

[0023] The materials of the upper wire mesh cover 1, the lower wire mesh cover 2, the wire mesh layer 4 and the spacer layer grid are 304, 304L, 316L, 321, 310, 317 stainless steel; PP / polypropylene; glass fiber blended; PE / polyethylene; PTFE / polytetrafluoroethylene; F46 / polyperfluoroethylene propylene; Monel alloy; pure nickel wire; pure titanium wire and other anti-corrosion materials.

[0024] The angle between the oblique side of the wave-shaped or sawtooth-shaped protrusion of the wire mesh layer 4 and the horizontal direction is 30-45 degrees. The oblique angles of the oblique sides of the wave-shaped or sawtooth-shaped protrusions between the wire mesh layers are matched to form a shield for the hot steam to prevent the hot steam from escaping. The top of the wire mesh cooler is matched with a fan with suction force. By setting the power of the fan, the hot steam rises into the wire mesh layer and does not escaping.

[0025] The ratio of the single-layer height of the wire mesh layer 4 to the diameter of the wire mesh cooler is 1:7-2:5, so as to achieve reasonable distribution of the counterweight and improve the condensation efficiency.

[0026] Example 1

[0027] The present invention uses 304 stainless steel, and uses pressing and welding to make a wire mesh layer 4 with a height of 150mm. The wire mesh layer 4 is a criss-cross wave-shaped protrusion, similar to the shape of an egg drag, and a spherical protrusion of φ15mm is evenly arranged on the surface to form a droplet condensation center to promote the condensation and collection of water vapor. The wire mesh layer 4 is embedded and installed in the frame 3 from top to bottom, and each layer is separated by a spacer layer grid. The top and bottom of the wire mesh layer 4 are connected to the spacer layer grid by welding, and support members are evenly arranged between the wire mesh layer 4 and the spacer layer grid for fixing and supporting the wire mesh layer 4. In this embodiment, three layers of wire mesh layers 4 are arranged from top to bottom, and the three layers of wire mesh layers 4 are horizontally rotated 15° and staggered in sequence. The diameter of the entire wire mesh cooler is 1000mm, and the width of the flow channel formed by the double-layer structure of the wire mesh layer 4 is 50mm. The angle between the hypotenuse of the wave-shaped or sawtooth-shaped protrusion of the wire mesh layer 4 and the horizontal direction is 30°, and this inclination angle has a shielding effect on hot steam. The wire mesh cooler is installed inside the water vapor pipeline, and support points are welded on the inner wall of the pipeline for fixing the cooler components.

[0028] When the tiny liquid droplets entrained in the gas phase pass through the wire mesh of the wire mesh cooler, the droplets hit the wire mesh and are adhered or adsorbed. After repeated adsorption of droplets, the extremely small droplets agglomerate and coalesce into large droplets. Under the action of gravity, the droplets move downward along the intersection of the woven wire mesh wires, while continuing to adsorb the droplets entrained in the gas. The grown droplets flow to the bottom of the cooler wire mesh and fall down by the gravity of the droplets themselves. In fact, during the absorption process, since the entire wire mesh cooler is filled with adsorbed droplets, the adsorption capacity of the demister wire mesh filaments is enhanced, so that when working normally, the demisting rate of the demisting wire mesh is greatly improved, and extremely small droplets can be effectively adsorbed and removed. This wire mesh cooler has the characteristics of small pressure drop, large specific surface area, and relatively high demisting efficiency. For droplets above 3μm, its demisting efficiency can reach more than 98%. The water vapor rises from the top of the cooling tower and enters the wire mesh cooler, condenses into water droplets inside and on the raised parts of the surface, and flows back to the cooling tower along the wire mesh. An axial flow fan is installed at the rear of the cooler to increase the water vapor flow rate and wind pressure.

[0029] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may alter, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A wire mesh cooler for sodium methoxide production, characterized in that: The invention comprises an upper screen cover (1), a lower screen cover (2), a frame (3), and a screen layer (4), wherein the upper screen cover (1) and the lower screen cover (2) are respectively arranged at the top and the bottom of the frame (3), wherein a plurality of screen layers (4) are arranged inside the frame (3), wherein the plurality of screen layers (4) are arranged horizontally rotated by 0-90 degrees, wherein the screen layer (4) has wavy or sawtooth-shaped protrusions that are staggered in a horizontal and vertical direction, wherein the screen layer (4) is a double-layer structure and has a flow channel inside, and spherical screen protrusions (4-1) that are connected to the internal channel of the screen layer (4) are evenly arranged on the wavy or sawtooth-shaped protrusions of the screen layer (4).

2. A wire mesh cooler for sodium methoxide production according to claim 1, characterized in that: A plurality of wire mesh layers (4) are separated from top to bottom by a spacing layer grid frame, and the spacing layer grid frame and the frame (3) fix the wire mesh layers (4).

3. A wire mesh cooler for sodium methoxide production according to claim 1 or 2, characterized in that: The materials of the upper wire mesh cover (1), the lower wire mesh cover (2), the wire mesh layer (4) and the spacer layer grid are one or more of 304, 304L, 316L, 321, 310, 317 stainless steel; PP / polypropylene; glass fiber blended; PE / polyethylene; PTFE / polytetrafluoroethylene; F46 / polyperfluoroethylene propylene; monel alloy; pure nickel wire; and pure titanium wire.

4. The wire mesh cooler for sodium methoxide production according to claim 1, characterized in that: The angle between the oblique sides of the wavy or sawtooth-shaped protrusions of the wire mesh layer (4) and the horizontal direction is 30-45°.

5. The wire mesh cooler for sodium methoxide production according to claim 1, characterized in that: The plurality of wire mesh layers (4) are horizontally rotated 5-45°.

6. The wire mesh cooler for sodium methoxide production according to claim 1, characterized in that: The ratio of the height of a single layer of the wire mesh layer (4) to the diameter of the wire mesh cooler is 1:7-2:5.

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