A method for preparing bamboo and wood water-spraying packing for cooling towers

Abstract

This invention discloses a method for preparing bamboo-wood water-spraying filler for cooling towers. The method involves: horizontally sawing bamboo into bamboo tubes, then longitudinally splitting them into bamboo unit pieces; drilling three holes along the center line of the width of each bamboo unit piece; adjusting the moisture content; and then sequentially subjecting the bamboo unit piece to dilute alkali and hydrothermal carbonization treatments to obtain arc-shaped bamboo filler pieces with a nano-micro-convex structure on the surface. Wood is sawn into boards, softened, compressed, and then made into round rods. Multiple arc-shaped bamboo filler pieces are strung together with these rods to form a set of bamboo water-spraying filler blocks. The bamboo water-spraying filler blocks are then soaked in water and dried, allowing the round rods to spring back and clamp the bamboo holes. During installation, two sets of dried bamboo water-spraying filler blocks are placed vertically. Set A consists of n arc-shaped bamboo filler pieces, and set B consists of n-1 arc-shaped bamboo filler pieces, arranged in a staggered pattern. This invention, through multiple hydrothermal passive treatments, forms a nano-array micro-convex structure on the bamboo surface. The installation method improves the water droplet splashing effect, enhancing both the droplet and film spraying capabilities.

Description

Technical Field

[0001] This invention belongs to the field of materials preparation technology, specifically relating to a method for preparing bamboo and wood water spraying packing for cooling towers. Background Technology

[0002] In the prior art, Chinese invention patent (CN105066767B) discloses a bamboo grid water-spraying filler for cooling towers and its manufacturing method, and Chinese patent (CN110779377B) discloses a manufacturing process in the construction method of bamboo grid water-spraying filler for cooling towers. Each bamboo strip needs to be drilled and connected. The components include plastic sleeves, connecting rods, bamboo nails, etc., which have many problems such as complex processes and inability to be mechanized. Chinese utility model patent (CN208952775U) uses a support and slot method to fix the bamboo strips in a bamboo grid water-spraying filler. This method is easier to operate than the former, but the metal will rust severely under long-term hydrothermal conditions and is prone to producing mud. Chinese utility model patent (CN213631756U) has a different bamboo grid installation method for cooling towers than the previous two. It is placed horizontally. This form is not conducive to the falling of water droplets and also affects the cooling effect.

[0003] Overall, most current patented methods for preparing bamboo grid packing have the following problems: firstly, the yield rate is low; secondly, the process is cumbersome, with low mechanization, which also affects durability. Furthermore, with the decreasing use of plastic products, all examples containing plastic components, such as the Chinese invention patent (CN110779377B) on a construction method for bamboo grid water-spreading packing in cooling towers and the Chinese utility model patent (CN210602966U) on a bamboo grid water-spreading packing for cooling towers, should be carefully considered to avoid affecting subsequent applications.

[0004] To address the aforementioned issues, a method for preparing bamboo and wood water-spraying packing for cooling towers is proposed. Summary of the Invention

[0005] The technical problem to be solved by this invention is to address the shortcomings of the prior art by providing a method for preparing bamboo and wood cooling tower filler. This method involves chemical treatment, which deposits nano-spherical structures formed by hemicellulose-lignin composites onto the surface of arc-shaped bamboo filler sheets, forming a nano-array micro-convex structure. This increases the water film surface area and heat exchange time, finding a balance between gas-liquid contact area, droplet residence time, and liquid bounce, thus improving the cooling performance of bamboo. The wooden connecting rod (round bar) utilizes the principle of mechanical moisture absorption to densify the wood, followed by wet heat treatment to allow it to spring back. As a natural connecting rod, it improves the mechanization of the bamboo cooling filler while avoiding easy damage at the joints.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is: a method for preparing bamboo and wood water-spraying packing for cooling towers, the method comprising the following steps:

[0007] S1. Select fresh bamboo, saw it horizontally into bamboo tubes, and then longitudinally split the bamboo tubes into bamboo unit pieces.

[0008] S2. Drill three holes at equal intervals along the center line of the width of the bamboo unit piece obtained in S1 to obtain a bamboo unit piece with holes.

[0009] S3. Adjust the moisture content of the perforated bamboo unit sheet obtained in S2 to 12%, and then subject it to dilute alkali pretreatment and hydrothermal carbonization treatment in sequence to obtain an arc-shaped bamboo filler sheet with a surface micro-convex structure formed by a nanosphere array of hemicellulose-lignin complex.

[0010] S4. Select wood, saw it into boards, soften and compress the boards to obtain compressed boards;

[0011] S5. The compressed board obtained in S4 is made into a round rod. The round rod is inserted into the three holes of multiple arc-shaped bamboo filler pieces obtained in S3 in sequence to form a set of bamboo water-spraying filler blocks, and the spacing between multiple arc-shaped bamboo filler pieces is adjusted.

[0012] S6. After soaking the bamboo water-spraying filler block obtained in S5 in water, it is dried. The round rod on the bamboo water-spraying filler block rebounds, fixing multiple arc-shaped bamboo filler pieces. After drying, multiple sets of bamboo water-spraying filler blocks are laid to obtain bamboo and wood water-spraying filler.

[0013] Preferably, the fresh bamboo material in S1 is 3-5 year old moso bamboo, the wall thickness of the bamboo tube is 8-12mm, and the inner wall diameter is 12-15mm; the size of the bamboo unit piece is 1000mm×40mm×(8-12)mm.

[0014] Preferably, the diameter of each hole in S2 is 10mm, and the hole spacing is 400mm.

[0015] Preferably, the dilute alkali pretreatment step in S3 is as follows: pretreating the perforated bamboo unit pieces with a moisture content of 12% with a sodium hydroxide solution with a mass fraction of 0.05-0.1% at a temperature of 70°C for 1 hour to obtain pretreated bamboo unit pieces; the solid-liquid ratio of the perforated bamboo unit pieces with a moisture content of 12% to the sodium hydroxide solution with a mass fraction of 0.05-0.1% is 1:(10-20).

[0016] Preferably, the hydrothermal carbonization step in S3 is as follows: the pretreated bamboo unit pieces are placed in water, the pH is adjusted to 5-6 with a weak acid, and then hydrothermal carbonization is carried out for 0.5-1h at a temperature of 160-170℃ and a pressure of 0.3-0.5MPa to obtain arc-shaped bamboo filler pieces; the solid-liquid ratio of the pretreated bamboo unit pieces to water is 1:(5-10); the weak acid is citric acid or oxalic acid.

[0017] Preferably, the density of the wood in S4 is less than 0.7 g / cm³. 3 The thickness of the sheet material is 12mm; the thickness of the compressed sheet material is 7-8mm.

[0018] Preferably, the softening and compression step in S4 is as follows: subjecting the plate to saturated steam heat treatment at a temperature of 160°C for 10 minutes, and then compressing it at a pressure of 2 MPa for 4 minutes; or soaking the plate in water for 1 hour, preheating it at a temperature of 160-180°C for 30 seconds, and then pressurizing it at a pressure of 6 MPa for 30 minutes; or boiling the plate in water for 30 minutes, then treating it under microwave conditions with an output power of 600W for 4 minutes, and then pressurizing it at a pressure of 6 MPa for 15 minutes.

[0019] Preferably, the diameter of the round rod in S5 is 7mm, and the spacing between every two arc-shaped bamboo filler pieces in a set of bamboo water-spraying filler blocks is 100mm.

[0020] Preferably, in step S6, the water temperature is room temperature and the soaking time is 8 hours; or the water temperature is 60°C and the soaking time is 20 minutes; the drying temperature is 30°C and the drying time is 1 hour.

[0021] Preferably, the laying method described in S6 is as follows: Select two sets of dried bamboo water-sprinkling filler blocks, divided into group A and group B. Group A consists of n arc-shaped bamboo filler pieces connected vertically, and group B consists of n-1 arc-shaped bamboo filler pieces connected vertically. During laying, place the two sets of dried bamboo water-sprinkling filler blocks vertically, forming an ABA laying pattern when viewed from the side. The arc-shaped bamboo filler pieces in group A and group B are arranged in a staggered pattern, forming a sine wave shape in the horizontal direction. The horizontal distance between the arc-shaped bamboo filler pieces in group A and group B is 2cm, and the vertical distance between the top arc-shaped bamboo filler piece in group A and the top arc-shaped bamboo filler piece in group B is 5cm.

[0022] Compared with the prior art, the present invention has the following advantages:

[0023] 1. This invention is composed of bamboo and wood, without any metal, plastic, or other components, thus avoiding water pollution and preventing filler blockage. Dilute alkali pretreatment removes the wax coating from the bamboo surface, while hydrothermal carbonization transforms the hemicellulose-lignin composite on the bamboo surface into a nano-spherical array of micro-convex structures. This structure increases the surface area of ​​the water film, thereby improving cooling performance. Dense wood is used as connectors, utilizing its moisture absorption and rebound expansion principle to achieve a stable connection. Since the bamboo-wood water-spraying filler is constantly in a hot water environment during use, the rebounded wood sticks maintain a stable connection. The connection method eliminates the need for metal or plastic components, and the entire process can be mechanized, reducing labor costs and significantly improving the production efficiency and cost reduction of bamboo fillers.

[0024] 2. The bamboo prepared by this invention undergoes repeated hydrothermal treatment, which effectively reduces the likelihood of cracking and warping, increases the yield and service life, and reduces downtime losses caused by frequent filler replacements. Furthermore, the entire process can be mechanized, making it suitable for mass production, significantly reducing labor costs and on-site installation time.

[0025] 3. This invention involves multiple hydrothermal passive treatments to form a nano-array micro-convex structure on the surface of bamboo. The laying method improves the water droplet splashing effect and simultaneously possesses the splashing effect required by droplet-type water-spraying fillers and the water droplet spreading performance required by film-type water-spraying fillers. In this invention, when water droplets fall from top to bottom, they can collide multiple times through the sinusoidal arrangement of the arc-shaped bamboo filler sheets, which is beneficial for the repeated breaking and redistribution of water droplets.

[0026] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0027] Figure 1 This is an electron microscope image of the green surface of a porous bamboo unit piece with a moisture content of 12% before hydrothermal carbonization treatment in Example 1 of the present invention.

[0028] Figure 2 This is an electron microscope image of the bamboo green surface of the arc-shaped bamboo filler sheet after hydrothermal carbonization treatment in Embodiment 1 of the present invention.

[0029] Figure 3 This is an electron microscope image of the yellow surface of the arc-shaped bamboo filler sheet after hydrothermal carbonization treatment in Example 1 of the present invention.

[0030] Figure 4 This is a schematic diagram of the laying method of the bamboo and wood water spraying filler for the cooling tower of the present invention. Detailed Implementation

[0031] Example 1

[0032] The method for preparing bamboo and wood water-spraying packing for cooling towers in this embodiment includes the following steps:

[0033] S1. Select fresh 4-year-old moso bamboo and cut a 1000cm long bamboo tube horizontally upward from a height of 150cm above the ground. The wall thickness of the bamboo tube is 12mm and the inner diameter is 15mm. Use a splitting device to longitudinally split the bamboo tube into bamboo unit pieces with a width of 40mm. The size of the bamboo unit pieces is 1000mm×40mm×12mm.

[0034] S2. Using an automatic drilling device, three holes are drilled at equal intervals along the center line of the width of the bamboo unit piece obtained in S1. The hole diameter is 10mm and the hole spacing is 400mm, thus obtaining a perforated bamboo unit piece.

[0035] S3. The perforated bamboo unit sheet obtained in S2 is ultrasonically cleaned for 8 minutes, then placed in a constant temperature and humidity chamber, and the moisture content is adjusted to 12%. Then, it is subjected to dilute alkali pretreatment and hydrothermal carbonization treatment in sequence to obtain the arc-shaped bamboo filler sheet.

[0036] The dilute alkali pretreatment step is as follows: the perforated bamboo unit pieces with a moisture content of 12% are pretreated with a sodium hydroxide solution with a mass fraction of 0.05% at a temperature of 70°C for 1 hour to obtain pretreated bamboo unit pieces; the solid-liquid ratio of the perforated bamboo unit pieces with a moisture content of 12% to the sodium hydroxide solution with a mass fraction of 0.05% is 1:20.

[0037] The hydrothermal carbonization process is as follows: the pretreated bamboo unit pieces are placed in a high-pressure hydrothermal cooking tank and water is added. The pH is adjusted to 5 with oxalic acid. Then, hydrothermal carbonization is carried out for 1 hour at a temperature of 160℃ and a pressure of 0.3MPa to obtain arc-shaped bamboo filler pieces. The solid-liquid ratio of the pretreated bamboo unit pieces to water is 1:5.

[0038] S4, Select a density of 0.4 g / cm³ 3 Poplar wood is used as timber. The moisture content of the wood is balanced to 10%, and then it is sawn into boards with a thickness of 12mm. The boards are softened and compressed at a compression rate of 40% to obtain compressed boards with a thickness of 7mm.

[0039] The softening and compression steps are as follows: the board is placed in a high-temperature steam softening tank, and high-temperature steam at 160°C is introduced. The temperature is maintained at 160°C for 10 minutes until the board achieves a softening effect. The steam in the tank is then released, and the softened wood is placed on a cold press and compressed for 4 minutes at a pressure of 2MPa.

[0040] S5. The compressed board obtained in S4 is fed into a wire drawing machine. First, it enters the flat cutting component to form a flat wood chip. Then, the edges are cut off by the winding cutting component to form a cylindrical rod. The rod is then polished to make the surface smooth. The diameter of the rod is 7mm and the length is 1550mm. The rod is then inserted into the three holes of multiple arc-shaped bamboo filler pieces obtained in S3 in sequence to form a set of bamboo water-spraying filler blocks. The distance between every two arc-shaped bamboo filler pieces is 100mm. One rod is inserted into each hole. A set of bamboo water-spraying filler blocks includes three rods and multiple arc-shaped bamboo filler pieces.

[0041] The height of the cooling tower packing layer is generally 1500mm. The resulting set of bamboo water spraying packing blocks consists of 15 arc-shaped bamboo packing pieces. After the round rod is inserted into the bamboo hole and before the shape springs back, in order to fix the distance between the two arc-shaped bamboo packing pieces, a temporary reinforcement method can be adopted, such as using spacers to separate the bamboo pieces, or using clamping parts for temporary reinforcement.

[0042] S6. After soaking the bamboo water-sprinkling filler blocks obtained in S5 in hot water at 60℃ for 20 minutes, dry them at 30℃ for 1 hour. The round rods on the bamboo water-sprinkling filler blocks will spring back, fixing multiple arc-shaped bamboo filler pieces. Select two groups of dried bamboo water-sprinkling filler blocks, dividing them into group A and group B. Group A consists of 15 arc-shaped bamboo filler pieces connected vertically, and group B consists of 14 arc-shaped bamboo filler pieces connected vertically. During installation, place the two groups of dried bamboo water-sprinkling filler blocks vertically, forming an ABA laying pattern when viewed from the side. The arc-shaped bamboo filler pieces in group A and group B are arranged in a staggered pattern, forming a sine wave shape in the horizontal direction. The horizontal distance between the arc-shaped bamboo filler pieces in group A and group B is 2 cm, and the vertical distance between the top arc-shaped bamboo filler pieces in group A and group B is 5 cm. The laying method is as follows. Figure 4 As shown, bamboo and wood water-spraying filler was prepared;

[0043] The rebound rate after boiling in 60℃ hot water is 50%-60%, and the diameter of the rebounded round rod is about 11mm, with an allowable dimensional deviation of ±0.5mm, which can be just right to be clamped in the bamboo hole to achieve the purpose of fixing the arc-shaped bamboo filler sheet.

[0044] S3 dilute alkali pretreatment removes the surface waxy portion of porous bamboo unit slices with a moisture content of 12%. Electron micrograph of the bamboo green surface before treatment is shown below. Figure 1 As shown, Figure 1 The bamboo green surface is visible to have a smooth structure. Hydrothermal carbonization dissolves hemicellulose-lignin complexes in the bamboo, which exhibit nanoscale spherical structures. These complexes can be effectively deposited through electrostatic adsorption or hydrogen bonding to form a micro-convex surface. The electron microscope image of the bamboo green surface of the arc-shaped bamboo filler sheet obtained after dilute alkali pretreatment and hydrothermal carbonization in S3 is shown below. Figure 2As shown, the electron microscope image of the yellow surface of the bamboo is as follows. Figure 3 As shown, Figure 1 As can be seen, both the surface of the treated bamboo green and the surface of the bamboo yellow exhibit nano-micro-protrusion structures;

[0045] S4 and S5 are processes for softening and compressing the board material, with a target compression rate of 40%. Because both wood and bamboo possess the mechanical moisture-absorbing property of rebounding and expanding after densification, the densification material can be wood; in this embodiment, poplar is chosen. Other woody materials, such as bamboo, can also be used, in which case the compression time needs to be increased to approximately 15-20 minutes to ensure it matches the pore size of the bamboo filler sheets. It should be noted that if the material's rebound rate is too high, and the diameter of the round rod exceeds the pore size by more than 1 mm, there is a probability that the bamboo sheets will crack.

[0046] Example 2

[0047] The method for preparing bamboo and wood water-spraying packing for cooling towers in this embodiment includes the following steps:

[0048] S1. Select fresh bamboo that is 4-5 years old and cut it horizontally upwards to form a 1000cm long bamboo tube from 150cm above the ground. The wall thickness of the bamboo tube is 8mm and the inner diameter is 12mm. Use a splitting device to longitudinally split the bamboo tube into bamboo unit pieces with a width of 40mm. The dimensions of the bamboo unit pieces are 1000mm×40mm×8mm.

[0049] S2. Using an automatic drilling device, three holes are drilled at equal intervals along the center line of the width of the bamboo unit piece obtained in S1. The hole diameter is 10mm and the hole spacing is 400mm, thus obtaining a perforated bamboo unit piece.

[0050] S3. The perforated bamboo unit sheet obtained in S2 is ultrasonically cleaned for 8 minutes, then placed in a constant temperature and humidity chamber, and the moisture content is adjusted to 12%. Then, it is subjected to dilute alkali pretreatment and hydrothermal carbonization treatment in sequence to obtain the arc-shaped bamboo filler sheet.

[0051] The dilute alkali pretreatment step is as follows: the perforated bamboo unit pieces with a moisture content of 12% are pretreated with a sodium hydroxide solution with a mass fraction of 0.1% at a temperature of 70°C for 1 hour to obtain pretreated bamboo unit pieces; the solid-liquid ratio of the perforated bamboo unit pieces with a moisture content of 12% and the sodium hydroxide solution with a mass fraction of 0.1% is 1:10.

[0052] The hydrothermal carbonization process is as follows: the pretreated bamboo unit pieces are placed in a high-pressure hydrothermal cooking tank and water is added. The pH is adjusted to 6 with citric acid, and then hydrothermal carbonization is carried out for 0.5 hours at a temperature of 170℃ and a pressure of 0.5MPa to obtain arc-shaped bamboo filler pieces. The solid-liquid ratio of the pretreated bamboo unit pieces to water is 1:10.

[0053] S4, Select a density of 0.4 g / cm³ 3 Poplar wood is used as timber. The moisture content of the wood is balanced to 10%, and then it is sawn into boards with a thickness of 12mm. The boards are softened and compressed at a compression rate of 30% to obtain compressed boards with a thickness of 8mm.

[0054] The softening and compression steps are as follows: the board is soaked in water at 25°C for 1 hour, and then placed on a hot press for hot pressing. The temperature of the hot press is 180°C, the preheating treatment is 30 seconds, the hot pressing pressure is 6 MPa, and the pressing time is 30 minutes.

[0055] S5. The compressed board obtained in S4 is fed into a wire drawing machine. First, it enters the flat cutting component to form a flat wood chip. Then, the edges are cut off by the winding cutting component to form a cylindrical rod. The rod is then polished to make the surface smooth. The diameter of the rod is 7mm and the length is 1550mm. The rod is then inserted into the three holes of multiple arc-shaped bamboo filler pieces obtained in S3 in sequence to form a set of bamboo water-spraying filler blocks. The distance between every two arc-shaped bamboo filler pieces is 100mm. One rod is inserted into each hole. A set of bamboo water-spraying filler blocks includes three rods and multiple arc-shaped bamboo filler pieces.

[0056] The height of the cooling tower packing layer is generally 1500mm. The resulting set of bamboo water spraying packing blocks consists of 15 arc-shaped bamboo packing pieces. After the round rod is inserted into the bamboo hole and before the shape springs back, in order to fix the distance between the two arc-shaped bamboo packing pieces, a temporary reinforcement method can be adopted, such as using spacers to separate the bamboo pieces, or using clamping parts for temporary reinforcement.

[0057] S6. After soaking the bamboo water-sprinkling filler blocks obtained in S5 in room temperature water at 25℃ for 8 hours, dry them at 30℃ for 1 hour. The round rods on the bamboo water-sprinkling filler blocks fix multiple arc-shaped bamboo filler pieces. Select two groups of dried bamboo water-sprinkling filler blocks, dividing them into group A and group B. Group A consists of 15 arc-shaped bamboo filler pieces connected vertically, and group B consists of 14 arc-shaped bamboo filler pieces connected vertically. During installation, place the two groups of dried bamboo water-sprinkling filler blocks vertically, forming an ABA laying pattern when viewed from the side. The arc-shaped bamboo filler pieces in group A and group B are arranged in a staggered pattern, forming a sinusoidal wave shape in the horizontal direction. The horizontal distance between the arc-shaped bamboo filler pieces in group A and group B is 2cm, and the vertical distance between the top arc-shaped bamboo filler pieces in group A and group B is 5cm. The laying method is as follows: Figure 4 As shown, bamboo and wood water-spraying filler was prepared;

[0058] The rebound rate after soaking in cold water is about 40%, and the diameter after rebound is about 11mm. The allowable dimensional deviation is ±0.5mm, which is just enough to fit tightly in the bamboo hole, thus achieving the purpose of fixing the arc-shaped bamboo filler sheet.

[0059] In this embodiment S4, the temperature of the hot press can also be 160°C, 162°C, 165°C, 168°C, 170°C, 173°C, 175°C or 178°C.

[0060] Example 3

[0061] The method for preparing bamboo and wood water-spraying packing for cooling towers in this embodiment includes the following steps:

[0062] S1. Select fresh 3-year-old bamboo and cut a 1000cm long bamboo tube horizontally upward from a height of 150cm above the ground. The wall thickness of the bamboo tube is 10mm and the inner diameter is 13mm. Use a splitting device to longitudinally split the bamboo tube into bamboo unit pieces with a width of 40mm. The size of the bamboo unit piece is 1000mm×40mm×10mm.

[0063] S2. Using an automatic drilling device, three holes are drilled at equal intervals along the center line of the width of the bamboo unit piece obtained in S1. The hole diameter is 10mm and the hole spacing is 400mm, thus obtaining a perforated bamboo unit piece.

[0064] S3. The perforated bamboo unit sheet obtained in S2 is ultrasonically cleaned for 8 minutes, then placed in a constant temperature and humidity chamber, and the moisture content is adjusted to 12%. Then, it is subjected to dilute alkali pretreatment and hydrothermal carbonization treatment in sequence to obtain the arc-shaped bamboo filler sheet.

[0065] The dilute alkali pretreatment step is as follows: the perforated bamboo unit pieces with a moisture content of 12% are pretreated with a sodium hydroxide solution with a mass fraction of 0.07% at a temperature of 70°C for 1 hour to obtain pretreated bamboo unit pieces; the solid-liquid ratio of the perforated bamboo unit pieces with a moisture content of 12% and the sodium hydroxide solution with a mass fraction of 0.07% is 1:15.

[0066] The hydrothermal carbonization process is as follows: the pretreated bamboo unit pieces are placed in a high-pressure hydrothermal cooking tank and water is added. The pH is adjusted to 5.5 with oxalic acid. Then, hydrothermal carbonization is carried out for 0.7 hours at a temperature of 165℃ and a pressure of 0.4MPa to obtain arc-shaped bamboo filler pieces. The solid-liquid ratio of the pretreated bamboo unit pieces to water is 1:7.

[0067] S4, Select a density of 0.4 g / cm³ 3 Poplar wood is used as timber. The moisture content of the wood is balanced to 10%, and then it is sawn into boards with a thickness of 12mm. The boards are softened and compressed at a compression rate of 40% to obtain compressed boards with a thickness of 7mm.

[0068] The softening and compression steps are as follows: the plate is boiled in boiling water at 100°C for 30 minutes, then treated under microwave conditions with an output power of 600W for 4 minutes, and then pressurized on a cold press with a pressure of 6MPa for 15 minutes.

[0069] S5. The compressed board obtained in S4 is fed into a wire drawing machine. First, it enters the flat cutting component to form a flat wood chip. Then, the edges are cut off by the winding cutting component to form a cylindrical rod. The rod is then polished to make the surface smooth. The diameter of the rod is 7mm and the length is 1550mm. The rod is then inserted into the three holes of multiple arc-shaped bamboo filler pieces obtained in S3 in sequence to form a set of bamboo water-spraying filler blocks. The distance between every two arc-shaped bamboo filler pieces is 100mm. One rod is inserted into each hole. A set of bamboo water-spraying filler blocks includes three rods and multiple arc-shaped bamboo filler pieces.

[0070] The height of the cooling tower packing layer is generally 1500mm. The resulting set of bamboo water spraying packing blocks consists of 15 arc-shaped bamboo packing pieces. After the round rod is inserted into the bamboo hole and before the shape springs back, in order to fix the distance between the two arc-shaped bamboo packing pieces, a temporary reinforcement method can be adopted, such as using spacers to separate the bamboo pieces, or using clamping parts for temporary reinforcement.

[0071] S6. After soaking the bamboo water-sprinkling filler blocks obtained in S5 in hot water at 60℃ for 20 minutes, dry them at 30℃ for 1 hour. The round rods on the bamboo water-sprinkling filler blocks will spring back, fixing multiple arc-shaped bamboo filler pieces. Select two groups of dried bamboo water-sprinkling filler blocks, dividing them into group A and group B. Group A consists of 15 arc-shaped bamboo filler pieces connected vertically, and group B consists of 14 arc-shaped bamboo filler pieces connected vertically. During installation, place the two groups of dried bamboo water-sprinkling filler blocks vertically, forming an ABA laying pattern when viewed from the side. The arc-shaped bamboo filler pieces in group A and group B are arranged in a staggered pattern, forming a sine wave shape in the horizontal direction. The horizontal distance between the arc-shaped bamboo filler pieces in group A and group B is 2 cm, and the vertical distance between the top arc-shaped bamboo filler pieces in group A and group B is 5 cm. The laying method is as follows. Figure 4 As shown, bamboo and wood water-spraying filler was prepared;

[0072] The rebound rate after soaking in hot water is about 50%, and the diameter after rebound is about 10.5mm. The allowable dimensional deviation is ±0.5mm, which is just enough to fit tightly in the bamboo hole, thus achieving the purpose of fixing the arc-shaped bamboo filler sheet.

[0073] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention in any way. Any simple modifications, alterations, and equivalent changes made to the above embodiments based on the inventive essence shall still fall within the protection scope of the present invention.

Claims

1. A method for preparing bamboo and wood water-spraying packing for a cooling tower, characterized in that, The method includes the following steps: S1. Select fresh bamboo, saw it horizontally into bamboo tubes, and then longitudinally split the bamboo tubes into bamboo unit pieces. The fresh bamboo material is 3-5 year old moso bamboo, the wall thickness of the bamboo tube is 8-12mm, and the inner wall diameter is 12-15mm; the size of the bamboo unit piece is 1000mm×40mm×(8-12)mm. S2. Drill three holes at equal intervals along the center line of the width of the bamboo unit piece obtained in S1 to obtain a bamboo unit piece with holes. Each hole has a diameter of 10mm and a spacing of 400mm. S3. Adjust the moisture content of the perforated bamboo unit sheet obtained in S2 to 12%, and then subject it to dilute alkali pretreatment and hydrothermal carbonization treatment in sequence to obtain an arc-shaped bamboo filler sheet with a surface micro-convex structure formed by a nanosphere array of hemicellulose-lignin complex. The dilute alkali pretreatment step is as follows: 12% moisture content perforated bamboo unit pieces are pretreated with a 0.05-0.1% sodium hydroxide solution at 70°C for 1 hour to obtain pretreated bamboo unit pieces; the solid-liquid ratio of the 12% moisture content perforated bamboo unit pieces to the 0.05-0.1% sodium hydroxide solution is 1:(10-20). The hydrothermal carbonization process is as follows: the pretreated bamboo unit pieces are placed in water, the pH is adjusted to 5-6 with a weak acid, and then hydrothermal carbonization is carried out for 0.5-1 hours at a temperature of 160-170℃ and a pressure of 0.3-0.5MPa to obtain arc-shaped bamboo filler pieces; the solid-liquid ratio of the pretreated bamboo unit pieces to water is 1:(5-10); the weak acid is citric acid or oxalic acid. S4. Select wood, saw it into boards, soften and compress the boards to obtain compressed boards; The density of the wood is less than 0.7 g / cm³. 3 The thickness of the sheet material is 12mm; the thickness of the compressed sheet material is 7-8mm. The softening and compression steps are as follows: the plate is subjected to saturated steam heat treatment at a temperature of 160℃ for 10 minutes, and then compressed at a pressure of 2MPa for 4 minutes; or the plate is soaked in water for 1 hour, preheated at a temperature of 160-180℃ for 30 seconds, and then pressurized at a pressure of 6MPa for 30 minutes; or the plate is boiled in water for 30 minutes, then treated under microwave conditions with an output power of 600W for 4 minutes, and then pressurized at a pressure of 6MPa for 15 minutes. S5. The compressed board obtained in S4 is made into a round rod. The round rod is inserted into the three holes of multiple arc-shaped bamboo filler pieces obtained in S3 in sequence to form a set of bamboo water-spraying filler blocks, and the spacing between multiple arc-shaped bamboo filler pieces is adjusted. The diameter of the round rod is 7mm, and the spacing between every two arc-shaped bamboo filler pieces in a set of bamboo water-spraying filler blocks is 100mm. S6. After soaking the bamboo water-draining filler block obtained in S5 in water, it is dried. The round rod on the bamboo water-draining filler block rebounds, fixing multiple arc-shaped bamboo filler pieces. After drying, multiple sets of bamboo water-draining filler blocks are laid to obtain bamboo and wood water-draining filler. The water temperature is room temperature, and the soaking time is 8 hours; or the water temperature is 60℃, and the soaking time is 20 minutes; the drying temperature is 30℃, and the time is 1 hour; the laying method is as follows: select two sets of dried bamboo water-sprinkling filler blocks, divided into group A and group B. Group A consists of n arc-shaped bamboo filler pieces connected vertically, and group B consists of n-1 arc-shaped bamboo filler pieces connected vertically; during laying, place the two sets of dried bamboo water-sprinkling filler blocks vertically, forming an ABA laying pattern when viewed from the side. The arc-shaped bamboo filler pieces of group A and group B are arranged in a staggered pattern, forming a sine wave shape in the horizontal direction; the horizontal distance between the arc-shaped bamboo filler pieces in group A and group B is 2 cm, and the vertical distance between the top arc-shaped bamboo filler pieces in group A and group B is 5 cm.

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