Composite water-cooled wall for biomass boiler and manufacturing method of composite water-cooled wall

Abstract

The invention relates to the technical field of boilers, in particular to a composite water-cooled wall for a biomass boiler and a manufacturing method thereof, the composite water-cooled wall comprises a water-cooled wall main body, and is characterized in that the water-cooled wall main body is formed by combining an upper water-cooled section, a middle water-cooled section and a lower water-cooled section; each of the upper water-cooling section, the middle water-cooling section and the lower water-cooling section comprises a light pipe, a sealing plate, a heat-resistant scratch nail, a nano-porous refractory castable, a reinforcing rib plate and a phase-change heat-insulating layer, and the light pipes, the heat-resistant scratch nails and the nano-porous refractory castable are combined to form a water-cooling wall component; the stability of the wall surface structure can be improved by pouring the refractory castable in the membrane wall, and wall surface cracks or other mechanical damages caused by temperature change due to instability of biomass fuel moisture are prevented; the nano-porous refractory castable has good heat conduction performance on the basis of good heat preservation performance, and heat generated in the boiler can be effectively transferred.

Description

Technical Field

[0001] The invention relates to the technical field of boilers, and in particular to a composite water-cooled wall for a biomass boiler and a manufacturing method thereof. Background Art

[0002] Driven by environmental protection policies and energy structure adjustments, biomass boilers have been widely promoted as a clean energy technology. The furnace is one of the core components of the biomass boiler, and the water-cooled wall is an important part of the furnace. The water-cooled wall is responsible for absorbing the heat generated during the combustion process and transferring the heat to the water in the boiler to form steam. At the same time, the water-cooled wall also protects the furnace and prevents the furnace wall from being damaged due to high temperature. Traditional water-cooled wall designs often use a single material and structure, which makes it difficult to simultaneously meet multiple requirements such as efficient heat transfer, high temperature resistance, thermal insulation and structural stability. In the application of biomass boilers, this limitation is particularly obvious because the combustion characteristics of biomass fuels are significantly different from those of traditional fuels.

[0003] A Chinese patent discloses a membrane water-cooled wall publication number: (CN 210485676 U) comprising a plurality of cooling water pipes arranged side by side, flat steels are welded between adjacent cooling water pipes, a welding surface and an unwelded surface are arranged between the flat steel and the cooling water pipe, the welding portion between the flat steel and the cooling water pipe is arc-shaped, arc-shaped connectors are fixedly connected between adjacent cooling water pipes on the unwelded surface, the arc-shaped connectors are tangent to the outer side wall of the cooling water pipe, the arc-shaped connectors comprise a corrosion-resistant layer and a thermal insulation layer, and the corrosion-resistant layer is correspondingly arranged on the outer side of the thermal insulation layer, steel plates are welded on the outer sides of the plurality of cooling water pipes, and the steel plates are correspondingly arranged on one side of the welding surface; however, the structural material of this water-cooled wall is single, and it is difficult to simultaneously meet multiple requirements such as efficient heat transfer, high temperature resistance, heat insulation and structural stability, therefore, a composite water-cooled wall for a biomass boiler and a manufacturing method and a use method thereof are needed. Summary of the invention

[0004] The purpose of the present invention is to solve the shortcomings of the water-cooled wall structure material being single and difficult to simultaneously meet multiple requirements such as efficient heat transfer, high temperature resistance, heat insulation and structural stability, and to propose a composite water-cooled wall for a biomass boiler and its manufacturing method and use method.

[0005] The technical solution adopted by the present invention to solve its technical problems is: a composite water-cooled wall for a biomass boiler, including a water-cooled wall body, characterized in that: the water-cooled wall body is mostly used in the arched area with higher temperature at the bottom of the biomass boiler furnace, and the water-cooled wall body is composed of an upper water-cooled section, a middle water-cooled section and a lower water-cooled section. The upper water-cooled section, the middle water-cooled section and the lower water-cooled section all include a light tube, a sealing plate, a heat-resistant gripping nail, a nano-porous refractory castable, a reinforcing rib plate and a phase-change insulation layer. The phase-change insulation layer adopts a high-temperature inorganic salt phase-change material, such as sodium nitrate, calcium nitrate, and potassium nitrate, and its melting point and solidification point are in the range of 200°C to 600°C. When the boiler is running, it absorbs a large amount of heat, and releases latent heat when the temperature drops to ensure the stability of the boiler temperature; the light tube, the heat-resistant gripping nail and the nano-porous refractory castable are combined to form a water-cooled wall component, and the water-cooled wall component cooperates with the phase change insulation layer and the sealing plate. The sealing plate is arranged on the back heat side of the light tube, the heat-resistant gripping nail is placed between the parallel arrangement of the light tubes and connected with the sealing plates, the nano-porous refractory castable is arranged on the heated side of the light tube and is used to fill the interval area of ​​the light tube. The outside of the heat-resistant gripping nail is wrapped with refractory castable, and the connection between the sealing plates, the connection between the sealing plate and the heat-resistant gripping nail, and the connection between the sealing plate and the light tube are all connected by reinforcing rib plates.

[0006] Preferably, the upper water-cooling section structure is a composite membrane wall castable interval type and includes three sections of water-cooled wall components and are arranged in an array with equal spacing; the middle water-cooling section structure is a composite membrane wall castable multi-interval type and includes two sections of water-cooled wall components and are arranged in an array with equal spacing; the lower water-cooling section structure is a composite membrane wall or a composite membrane wall triangular block type, the composite membrane wall and the composite membrane wall triangular block type both include water-cooled wall components and are integrated, the upper water-cooling section and the lower water-cooling section are triangular structures as a whole, and the middle water-cooling section is a square structure.

[0007] Preferably, the composite membrane wall castable is of interval type, composite membrane wall castable is of multi-interval type, and the composite membrane wall has arc-shaped edges and the heat-resistant nail connections are of straight lines, and the composite membrane wall triangular block type has triangular heat-resistant nail connections.

[0008] Preferably, the sealing plates are arranged in an arched block-type, and each sealing plate is welded. The sealing plates are made of 5mm carbon steel (Q235B) and the welding thickness is 3mm.

[0009] Preferably, the heat-resistant gripping nails are staggered on the sealing plate and arranged between each light tube by welding, and the heat-resistant gripping nails are made of heat-resistant steel; in addition, in a high-temperature corrosion or high-temperature oxidation environment, the heat-resistant gripping nails are made of alloy steel or stainless steel to cope with different working conditions, and the heat-resistant gripping nails are made of a hook structure, a V-shaped structure, a threaded nail structure, a ball head structure or a T-shaped structure. The heat-resistant gripping nails are made of a hook structure, a V-shaped structure, a threaded nail structure, a ball head structure or a T-shaped structure.

[0010] Preferably, a self-cleaning assembly is provided on the top of the water-cooled wall body, a connecting piece is provided on the top of the self-cleaning assembly, a boiler top cover is provided on the top of the connecting piece, the self-cleaning assembly includes a lifting arm, a telescopic arm is connected to the bottom of the lifting arm, linear slides are provided at both ends of the telescopic arm, a mounting frame is provided on one side of the linear slide, a fixed plate is provided on one side of the mounting frame, the number of the fixed plates is 2 and they are arranged correspondingly, a driving motor is provided on the top of the fixed plate, the bottom of the driving motor passes through the fixed plate and is connected to an output shaft, one end of the output shaft is connected to a transmission shaft, a cleaning brush is provided on the transmission shaft, and both ends of the cleaning brush are trapezoidal structures. The composite water-cooled wall for biomass boilers realizes the automatic dirt and carbon deposition removal function by integrating the self-cleaning assembly, effectively maintains the cleanliness of the water-cooled wall, significantly improves the heat conduction efficiency and prolongs the service life of the equipment. The combination of the lifting arm and the telescopic arm in its design provides flexible cleaning capabilities for water-cooled walls of different heights and positions, and enhances the adaptability and maintenance convenience of the equipment. The application of linear guide rails ensures the stability and precision of the self-cleaning components, thereby ensuring the consistency and reliability of the cleaning effect. The configuration of the drive motor and the output shaft provides a stable power source for the cleaning system, ensuring the normal operation of the cleaning brush. In addition, the cleaning brush adopts a trapezoidal structure design, which not only increases the cleaning effect, but also improves the stability and cleaning efficiency, and overall improves the performance and economy of the biomass boiler.

[0011] Preferably, the nanoporous refractory castable is arranged in parallel intervals on the heated side of the light pipe and can be cast alternately or regularly dispersedly; the casting boundary of the heated side of the nanoporous refractory castable can be inside the light pipe or can be cast tangent to the heated surface of the light pipe.

[0012] Preferably, the nanoporous refractory castable structure is a porous structure at the micrometer or nanometer level, and nanopores are provided inside the nanoporous refractory castable, and the nanopores are filled with carbon nanotubes, which can improve thermal conductivity and wear resistance while ensuring high temperature resistance. The nanoporous refractory castable can also fill the nanopores with thermal conductive materials such as carbon nanotubes, graphene, etc. to further improve thermal conductivity.

[0013] Preferably, the number of the light pipes is 10 to 15 and they are arranged in parallel, with a spacing of 300 mm between each light pipe. In addition, if parallel distribution of light pipes cannot meet the design requirements, staggered parallel distribution and other arrangement methods may also be used.

[0014] Preferred:

[0015] (1) Prepare materials and parts

[0016] Light pipe (1): select a suitable number (e.g. 10 to 15) of light pipes, which will serve as the main heat transfer part of the water-cooled wall; Sealing plate: prepare a number of 5 mm thick carbon steel (Q235B) sealing plates, each of which is connected by welding; Heat-resistant gripping nails: prepare gripping nails made of heat-resistant steel, which may be hook-shaped, V-shaped, threaded nails, ball-head or T-shaped structures; Nanoporous refractory castable: prepare refractory castable with a micron or nanometer-scale porous structure, which is filled with carbon nanotubes; Reinforcement plate: prepare a reinforcement plate for connecting various components to ensure the stability of the structure; Phase change insulation layer: prepare a phase change insulation material for heat insulation;

[0017] (2) Installing parts

[0018] Arrange 10 to 15 light tubes in parallel, with a spacing of 300mm between each light tube. The light tube is the core part of the water-cooled wall, responsible for absorbing the heat inside the boiler and taking it away through the water flow; heat-resistant gripping nails are arranged alternately in the intervals between the light tubes, and the gripping nails are fixed between each light tube by welding; the function of the heat-resistant gripping nails is to fix the sealing plate and the nanoporous refractory castable, while enhancing the heat resistance and stability of the overall structure; the sealing plate is arranged on the back heat side of the light tube, and each sealing plate is connected by welding. The function of the sealing plate is to prevent heat from being directly transferred to the back of the light tube and protect the light tube and other components; fill the parallel intervals on the heated side of the light tube with nanoporous refractory castables. This material has excellent high temperature resistance and heat insulation effect, and can effectively protect the light tube and other components from high temperature damage; use a reinforcing rib plate to wrap the outside of the heat-resistant gripping nails and connect them with the sealing plate, light tube and other components. The function of the reinforcing rib plate is to enhance the strength and stability of the overall structure and ensure that it is not easily deformed or damaged in a high temperature environment; arrange a phase change insulation layer on the outermost layer of the water-cooled wall. This material can undergo phase changes when the temperature changes, absorbing or releasing a large amount of heat, thereby keeping the temperature of the water-cooled wall stable;

[0019] (3) Assembly

[0020] Assemble the upper water-cooling section, the middle water-cooling section and the lower water-cooling section separately. The upper water-cooling section adopts a composite membrane wall castable interval design, the middle water-cooling section adopts a composite membrane wall castable multi-interval design, and the lower water-cooling section can adopt a composite membrane wall or a composite membrane wall triangular block design. The upper, middle and lower water-cooling sections are connected by welding or other means to form a complete composite water-cooling wall;

[0021] (4) Testing and debugging

[0022] After assembly, the composite water-cooled wall is tested and debugged to ensure that it can work normally and achieve the expected results. If any problems or abnormalities are found, they should be adjusted or repaired in time.

[0023] The present invention is beneficial in that:

[0024] The present application can increase the stability of the wall structure by pouring refractory castables in the membrane wall, and prevent wall cracks or other mechanical damage caused by temperature changes due to the instability of the moisture content of the biomass fuel; the nanoporous refractory castable has good thermal conductivity on the basis of good thermal insulation performance, and can effectively transfer the heat generated in the boiler, which has higher thermal efficiency than the traditional membrane wall; the phase change insulation layer absorbs a large amount of latent heat when the boiler is running, and releases latent heat when the temperature drops to increase the temperature to ensure the stability of the boiler; the composite membrane wall structure reduces the use of refractory bricks or refractory castables, reduces the overall quality of the boiler, thereby reducing the material cost of the biomass boiler furnace body and steel frame, and can automatically remove dirt and carbon deposits by integrating self-cleaning components, maintain cleanliness, improve heat conduction efficiency and extend service life. The lifting arm and telescopic arm design enhance the flexibility of cleaning, and the linear slide ensures stability and precision. The drive motor provides stable power, and the cleaning brush with a trapezoidal structure improves the cleaning effect and efficiency, which improves the performance and economy of the biomass boiler as a whole. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0026] See also Figure 1-6 As shown:

[0027] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0028] Figure 2 It is a schematic diagram of the main structure of the water-cooled wall of the present invention.

[0029] Figure 3 It is a schematic diagram of the composite membrane wall structure of the present invention.

[0030] Figure 4 It is a schematic diagram of the triangular block structure of the composite membrane wall of the present invention.

[0031] Figure 5 It is a schematic diagram of the compartmentalized structure of the composite membrane wall castable of the present invention.

[0032] Figure 6 It is a schematic diagram of the multi-compartment structure of the composite membrane wall castable of the present invention.

[0033] Figure 7 It is a schematic diagram of the structure of the self-cleaning component of the present invention.

[0034] In the figure: 1. light tube; 2. sealing plate; 3. heat-resistant gripper; 4. nanoporous refractory castable; 5. reinforcing rib plate; 6. phase change insulation layer; 7. nanopores; 8. water-cooled wall component; 9. water-cooled wall body; 10. upper water-cooled section; 11. middle water-cooled section; 12. lower water-cooled section; 13. lifting arm; 14. linear slide rail; 15. telescopic arm; 16. mounting frame; 17. fixing plate; 18. driving motor; 19. output shaft; 20. transmission shaft; 21. cleaning brush; 22. self-cleaning component; 23. connecting piece; 24. boiler top cover. DETAILED DESCRIPTION

[0035] Example

[0036] See also Figure 1-7 As shown:

[0037] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0038] Embodiment 1: A composite water-cooled wall for a biomass boiler, comprising a water-cooled wall body 9, characterized in that: the water-cooled wall body 9 is mostly used in the arched area at the bottom of the biomass boiler furnace where the temperature is relatively high, the water-cooled wall body 9 is composed of an upper water-cooled section 10, a middle water-cooled section 11 and a lower water-cooled section 12, the upper water-cooled section 10, the middle water-cooled section 11 and the lower water-cooled section 12 all include a light pipe 1, a sealing plate 2, a heat-resistant gripping nail 3, a nanoporous refractory castable 4, a reinforcing rib plate 5 and a phase change insulation layer 6, the phase change insulation layer 6 adopts a high-temperature inorganic salt phase change material, such as sodium nitrate, calcium nitrate, potassium nitrate, whose melting point and solidification point are in the range of 200°C to 600°C, when the boiler is running It absorbs a large amount of heat and releases latent heat when the temperature drops to ensure the stability of the boiler temperature; the light tube 1, the heat-resistant gripping nail 3 and the nano-porous refractory castable 4 are combined to form a water-cooled wall component 8, and the water-cooled wall component 8 cooperates with the phase change insulation layer 6 and the sealing plate 2. The sealing plate 2 is arranged on the heat-resistant side of the light tube 1, and the heat-resistant gripping nail 3 is placed between the parallel arrangement of the light tubes 1 and connected with the sealing plates 2. The nano-porous refractory castable 4 is arranged on the heated side of the light tube 1 and is used to fill the interval area of ​​the light tube 1. The outer side of the heat-resistant gripping nail 3 is wrapped with refractory castable, and the connection between the sealing plates 2, the connection between the sealing plate 2 and the heat-resistant gripping nail 3, and the connection between the sealing plate 2 and the light tube 1 are all connected by reinforcing rib plates 5.

[0039] In this embodiment, the structure of the upper water-cooling section 10 is a composite membrane wall castable interval type and includes three sections of water-cooled wall components 8 and are arranged in an array with equal spacing; the structure of the middle water-cooling section 11 is a composite membrane wall castable multi-interval type and includes two sections of water-cooled wall components 8 and are arranged in an array with equal spacing; the structure of the lower water-cooling section 12 is a composite membrane wall or a composite membrane wall triangular block type, and the composite membrane wall and the composite membrane wall triangular block type both include water-cooled wall components 8 and are integrated, the upper water-cooling section 10 and the lower water-cooling section 12 are triangular structures as a whole, and the middle water-cooling section 11 is a square structure.

[0040] In this embodiment, the composite membrane wall castable is spaced type, the composite membrane wall castable is multi-spaced type, and the composite membrane wall edge is arc-shaped and the heat-resistant nails 3 are connected at a straight line, and the composite membrane wall triangular block type heat-resistant nails 3 are connected at a triangular shape.

[0041] In this embodiment, the sealing plates 2 are arranged in an arched block-type arrangement, and each sealing plate 2 is welded. The sealing plates 2 are made of 5mm carbon steel (Q235B) and have a welding thickness of 3mm. The sealing plates 2 are common products on the market and can be purchased directly.

[0042] In this embodiment, the heat-resistant gripping nails 3 are arranged in an alternating manner on the sealing plate 2 and are arranged between each light tube 1 by welding. The heat-resistant gripping nails 3 are made of heat-resistant steel; the heat-resistant steel is a common product on the market and can be purchased directly. In addition, in a high-temperature corrosion or high-temperature oxidation environment, the heat-resistant gripping nails 3 use alloy steel or stainless steel to cope with different working conditions. The heat-resistant gripping nails 3 use a hook structure, a V-shaped structure, a threaded nail structure, a ball head structure or a T-shaped structure. The heat-resistant gripping nails 3 use a hook structure, a V-shaped structure, a threaded nail structure, a ball head structure or a T-shaped structure. The heat-resistant gripping nails 3 use a hook structure, a V-shaped structure, a threaded nail structure, a ball head structure or a T-shaped structure.

[0043] In this embodiment, a self-cleaning component 22 is provided on the top of the water-cooled wall body, a connecting piece 23 is provided on the top of the self-cleaning component 22, a boiler top cover 24 is provided on the top of the connecting piece 23, the self-cleaning component 22 includes a lifting arm 13, a telescopic arm 15 is connected to the bottom of the lifting arm 13, linear slide rails 14 are provided at both ends of the telescopic arm 15, a mounting frame 16 is provided on one side of the linear slide rail 14, a fixing plate 17 is provided on one side of the mounting frame 16, the number of the fixing plates 17 is 2 and they are arranged correspondingly, a driving motor 18 is provided on the top of the fixing plate 17, the bottom of the driving motor 18 passes through the fixing plate 17 and is connected to an output shaft 19, one end of the output shaft 19 is connected to a transmission shaft 20, a cleaning brush 21 is provided on the transmission shaft 20, and the upper and lower ends of the cleaning brush 21 are both trapezoidal structures. The composite water-cooled wall for the biomass boiler realizes the automatic dirt and carbon deposit removal function by integrating the self-cleaning component 22, effectively maintains the cleanliness of the water-cooled wall, significantly improves the heat conduction efficiency and prolongs the service life of the equipment. The combination of the lifting arm 13 and the telescopic arm 15 in its design provides flexible cleaning capabilities for water-cooled walls at different heights and positions, enhancing the adaptability and maintenance convenience of the equipment. The application of the linear slide 14 ensures the stability and accuracy of the self-cleaning component 22, thereby ensuring the consistency and reliability of the cleaning effect. The configuration of the drive motor 18 and the output shaft 19 provides a stable power source for the cleaning system, ensuring the normal operation of the cleaning brush 21. In addition, the cleaning brush 21 adopts a trapezoidal structure design, which not only increases the cleaning effect, but also improves the stability and cleaning efficiency, and overall improves the performance and economy of the biomass boiler.

[0044] In this embodiment, the nanoporous refractory castable 4 is arranged in parallel intervals on the heated side of the light tube 1 and can be cast alternately or regularly dispersedly; the casting boundary of the heated side of the nanoporous refractory castable 4 can be on the inner side of the light tube 1, or can be cast tangent to the heated surface of the light tube 1.

[0045] In this embodiment, the structure of the nanoporous refractory castable 4 is a porous structure of micrometer or nanometer scale. The nanoporous refractory castable 4 is provided with nanopores 7 inside. The nanopores 7 are filled with carbon nanotubes. On the basis of ensuring high temperature resistance, the thermal conductivity and wear resistance can be improved. The nanoporous refractory castable 4 can also fill the nanopores 7 with thermal conductive materials such as carbon nanotubes, graphene, etc. to further improve the thermal conductivity.

[0046] In this embodiment, the number of the light pipes 1 is 10 to 15 and they are arranged in parallel, and the spacing between each light pipe 1 is 300 mm. In addition, if the parallel distribution of the light pipes 1 cannot meet the design requirements, staggered parallel distribution and other arrangement methods can also be used.

[0047] In this embodiment:

[0048] (1) Prepare materials and parts

[0049] Light pipe 1 (1): select a suitable number (e.g. 10 to 15) of light pipes 1, which will serve as the main heat transfer part of the water-cooled wall; Sealing plate 2: prepare a number of 5 mm thick carbon steel (Q235B) sealing plates 2, each of which is connected by welding; Heat-resistant gripping nails 3: prepare gripping nails made of heat-resistant steel, which may be hook-shaped, V-shaped, threaded nails, ball-head or T-shaped structures; Nanoporous refractory castable 4: prepare refractory castable with a micron or nanometer-scale porous structure, which is filled with carbon nanotubes; Reinforcement plate 5: prepare reinforcement plate 5 for connecting various components to ensure the stability of the structure; Phase change insulation layer 6: prepare phase change insulation material for heat insulation;

[0050] (2) Installing parts

[0051] Arrange 10 to 15 light tubes 1 in parallel, with a spacing of 300 mm between each light tube 1. Light tube 1 is the core part of the water-cooled wall, responsible for absorbing the heat inside the boiler and taking it away through water flow; Heat-resistant gripping nails 3 are arranged alternately in the intervals between the light tubes 1, and the gripping nails are fixed between each light tube 1 by welding; The function of the heat-resistant gripping nails 3 is to fix the sealing plate 2 and the nanoporous refractory castable 4, while enhancing the heat resistance and stability of the overall structure; The sealing plate 2 is arranged on the back heat side of the light tube 1, and each sealing plate 2 is connected by welding. The function of the sealing plate 2 is to prevent heat from being directly transferred to the back of the light tube 1 and protect the light tube 1 and other components; Fill the parallel intervals on the heated side of the light tube 1 with nanoporous refractory castable 4. This material has excellent high temperature resistance and heat insulation effect, and can effectively protect the light tube 1 and other components from high temperature damage; Use a reinforcing rib plate 5 to wrap the outside of the heat-resistant gripping nail 3 and connect it with the sealing plate 2, light tube 1 and other components. The function of the reinforcing rib plate 5 is to enhance the strength and stability of the overall structure and ensure that it is not easily deformed or damaged in a high temperature environment; a phase change insulation layer 6 is arranged on the outermost layer of the water-cooled wall. This material can undergo phase change when the temperature changes, absorb or release a large amount of heat, thereby maintaining the temperature of the water-cooled wall stable;

[0052] (3) Assembly

[0053] Assemble the upper water-cooling section 10, the middle water-cooling section 11 and the lower water-cooling section 12 separately. The upper water-cooling section 10 adopts a composite membrane wall castable compartment design, the middle water-cooling section 11 adopts a composite membrane wall castable multi-compartment design, and the lower water-cooling section 12 can adopt a composite membrane wall or a composite membrane wall triangular block design. The upper, middle and lower water-cooling sections 12 are connected by welding or other means to form a complete composite water-cooling wall;

[0054] (4) Testing and debugging

[0055] After assembly, the composite water-cooled wall is tested and debugged to ensure that it can work normally and achieve the expected results. If any problems or abnormalities are found, they should be adjusted or repaired in time.

[0056] Embodiment 2:

[0057] Reference Figure 3The composite water-cooled wall of this embodiment is mainly composed of a light pipe 11, a sealing plate 22, a heat-resistant gripping nail 33, a nanoporous refractory castable 44, a reinforcing rib plate 55, and a phase change insulation layer 66. The composite water-cooled wall is mostly used in the arched area with a higher temperature at the bottom of the furnace of a biomass boiler. The light pipes 11 are arranged in parallel, and the spacing between each light pipe 11 is 300 mm. The sealing plate 22 is arranged on the back heat side of the light pipe 11 and the light pipe 1 is welded with a metal material. The heat-resistant gripping nail 33 is placed between the parallel arrangement intervals of the light pipe 1 and is welded to the sealing plate 22. The nanoporous refractory castable 4 is arranged on the heated side of the light pipe 11 and is used to fill the interval area of ​​the light pipe 11, and the refractory castable 4 is wrapped in the refractory castable. The membrane water-cooled wall light tubes 1 are arranged in parallel; the sealing plates 22 are made of 5 mm carbon steel (Q235B), arranged in blocks, each sealing plate 22 is welded with a welding thickness of 3 mm, each sealing plate 22 is welded to the light tube 11 with a carbon steel reinforcing rib plate 55, and two sealing plates 22 are welded; the heat-resistant grasping nails 33 are staggered on the sealing plates 22 and arranged between each light tube 11 by welding, and the heat-resistant grasping nails 33 are hook-shaped and made of heat-resistant steel; the nanoporous refractory castable 44 is arranged in the parallel interval area on the heated side of the light tube 1, and the nanoporous refractory castable 44 is made of micrometers or nanometers. The porous structure of meter-level scale can improve thermal conductivity and wear resistance on the basis of ensuring high temperature resistance. The nanoporous refractory castable 4 can also fill the nanopores 7 with thermal conductive materials such as carbon nanotubes, graphene, etc. to further improve thermal conductivity; the reinforcing rib plate 55 is used for welding between sealing plates 2 or welding between sealing plates 2 and heat-resistant gripping nails 3; the thermal insulation layer 6 is arranged between the sealing plate 2 and the refractory castable, and adopts high-temperature inorganic salt phase change material, such as sodium nitrate, calcium nitrate, potassium nitrate, whose melting point and solidification point are in the range of 200℃ to 600℃, absorbs a large amount of heat when the boiler is running, and releases latent heat when the temperature drops to ensure the stability of the boiler temperature. Compared with the prior art, the composite water-cooled wall using the above scheme has significant advantages such as strong thermal insulation, no mechanical damage to the wall surface, high heat conduction efficiency, and saving the total cost of the boiler. It is worth promoting in the field of boilers, especially in the application of the furnace wall of large biomass boilers.

[0058] Embodiment three:

[0059] like Figure 4As shown, the difference between this embodiment and the first embodiment is that the sealing plate 22 is arranged in a triangular block, and the two sides of the triangular sealing plate 2 are connected by welding, and the sealing plate 22 and the light pipe 11 are connected by welding. In addition, the heating surface of the nanoporous refractory castable 44 of this embodiment is not tangent to the heating surface of the light pipe 11, and the nanoporous refractory castable 44 is filled inside the cross section of the light pipe 11. In addition, no insulation layer is used between the sealing plate 22 and the nanoporous refractory castable 44 of this embodiment. If the insulation effect needs to be increased, an insulation layer can also be prevented between the sealing plate 22 and the nanoporous refractory castable 44. In this way, the amount of nanoporous refractory castable 4 used can be controlled by controlling the shape of the sealing plate 22, and the high temperature resistance of the composite membrane wall can be further improved on the basis of controlling the cost.

[0060] Embodiment 4:

[0061] like Figure 5 As shown, the difference between this embodiment and the first embodiment is that the nanoporous refractory castables 44 between the intervals of the light pipe 11 are arranged alternately, that is, the first interval is filled with the nanoporous refractory castable 44, the second interval is not filled with the refractory castable, and so on, and the heating surface of the nanoporous refractory castable 44 is not tangent to the heating surface of the light pipe 11, and the nanoporous refractory castable 44 is filled inside the cross section of the light pipe 11. In this way, the high temperature resistance of the composite water-cooled wall can be controlled by controlling the filling area of ​​the nanoporous refractory castable 4, thereby saving the use cost of the filling material and achieving a balance between cost and thermal efficiency.

[0062] In addition, if Figure 6 As shown, the nanoporous refractory castables 44 between the intervals of the light tube 11 are arranged alternately. It is also possible to adopt a structure in which two intervals are filled with refractory castables and the third interval is not filled with refractory castables.

[0063] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a combined manner.

[0064] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, and these changes and improvements all fall within the scope of the present invention to be protected.

Claims

1. A composite water-cooled wall for a biomass boiler, comprising a water-cooled wall body (9), characterized in that: The water-cooled wall body (9) is composed of an upper water-cooling section (10), a middle water-cooling section (11) and a lower water-cooling section (12); the upper water-cooling section (10), the middle water-cooling section (11) and the lower water-cooling section (12) all include a light pipe (1), a sealing plate (2), a heat-resistant gripping nail (3), a nanoporous refractory castable (4), a reinforcing rib plate (5) and a phase-change thermal insulation layer (6); the light pipe (1), the heat-resistant gripping nail (3) and the nanoporous refractory castable (4) are combined to form a water-cooled wall component (8); the water-cooled wall component (8) and the phase-change thermal insulation layer ( 6) and a sealing plate (2), the sealing plate (2) being arranged on the heat-resistant side of the light pipe (1), the heat-resistant gripping nail (3) being placed between the parallel arrangement intervals of the light pipe (1) and connected to the sealing plate (2), the nanoporous refractory castable (4) being arranged on the heat-receiving side of the light pipe (1) and used to fill the interval area of ​​the light pipe (1), the heat-resistant gripping nail (3) being wrapped with refractory castable on the outside, the connection between the sealing plates (2), the connection between the sealing plates (2) and the heat-resistant gripping nail (3), and the connection between the sealing plates (2) and the light pipe (1) are all connected by reinforcing rib plates (5).

2. The composite water-cooled wall for a biomass boiler according to claim 1, characterized in that: The structure of the upper water-cooling section (10) is of a composite membrane wall castable interval type and includes three sections of water-cooling wall components (8) arranged in an array with equal spacing; the structure of the middle water-cooling section (11) is of a composite membrane wall castable multi-interval type and includes two sections of water-cooling wall components (8) arranged in an array with equal spacing; the structure of the lower water-cooling section (12) is of a composite membrane wall or a composite membrane wall triangular block type, the composite membrane wall and the composite membrane wall triangular block type both include water-cooling wall components (8) and are integrally constructed, the upper water-cooling section (10) and the lower water-cooling section (12) are of a triangular structure as a whole, and the middle water-cooling section (11) is of a square structure.

3. The composite water-cooled wall for a biomass boiler according to claim 2, characterized in that: The composite membrane wall castable material is of interval type, composite membrane wall castable material is of multi-interval type, and the composite membrane wall has an arc-shaped edge and the heat-resistant nail (3) connection is of straight line type. The composite membrane wall triangular block type heat-resistant nail (3) connection is of triangle type.

4. The composite water-cooled wall for a biomass boiler according to claim 1, characterized in that: The sealing plates (2) are arranged in an arched block-type arrangement, and each sealing plate (2) is welded to each other. The sealing plates (2) are made of 5 mm carbon steel (Q235B) and have a welding thickness of 3 mm.

5. The composite water-cooled wall for a biomass boiler according to claim 1, characterized in that: The heat-resistant gripping nails (3) are arranged in a staggered manner on the sealing plate (2) and are arranged between each light tube (1) by welding. The heat-resistant gripping nails (3) are made of heat-resistant steel. The heat-resistant gripping nails (3) have a hook-shaped structure, a V-shaped structure, a threaded nail structure, a ball head structure or a T-shaped structure. The heat-resistant gripping nails (3) have a hook-shaped structure, a V-shaped structure, a threaded nail structure, a ball head structure or a T-shaped structure.

6. The composite water-cooled wall for a biomass boiler according to claim 1, characterized in that: A self-cleaning component (22) is provided at the top of the water-cooled wall body, a connecting piece (23) is provided at the top of the self-cleaning component (22), a boiler top cover (24) is provided at the top of the connecting piece (23), the self-cleaning component (22) comprises a lifting arm (13), a telescopic arm (15) is connected to the bottom of the lifting arm (13), linear slide rails (14) are provided at both ends of the telescopic arm (15), a mounting frame (16) is provided on one side of the linear slide rail (14), a fixing plate (17) is provided on one side of the mounting frame (16), two fixing plates (17) are provided and are arranged correspondingly, a driving motor (18) is provided at the top of the fixing plate (17), the bottom of the driving motor (18) passes through the fixing plate (17) and is connected to an output shaft (19), one end of the output shaft (19) is connected to a transmission shaft (20), a cleaning brush (21) is provided on the transmission shaft (20), and both upper and lower ends of the cleaning brush (21) are trapezoidal structures.

7. The composite water-cooled wall for a biomass boiler according to claim 1, characterized in that: The nanoporous refractory castable (4) is arranged in a parallel spacing area on the heating side of the light pipe (1), and the casting boundary of the heating side of the nanoporous refractory castable (4) can be inside the light pipe (1), or can be cast tangent to the heating surface of the light pipe (1).

8. The composite water-cooled wall for a biomass boiler according to claim 1, characterized in that: The nanoporous refractory castable (4) has a porous structure of micrometer or nanometer scale. Nanopores (7) are arranged inside the nanoporous refractory castable (4), and the nanopores (7) are filled with carbon nanotubes.

9. The composite water-cooled wall for a biomass boiler according to claim 1, characterized in that: The number of the light tubes (1) is 10 to 15 and they are arranged in parallel, and the spacing between each light tube (1) is 300 mm.

10. A method for manufacturing a composite water-cooled wall for a biomass boiler according to claim 1, characterized in that: (1) Prepare materials and parts Light pipes (1): select a suitable number (e.g., 10 to 15) of light pipes (1); Sealing plates (2): prepare a number of 5 mm thick carbon steel (Q235B) sealing plates (2); Heat-resistant gripping nails (3): prepare gripping nails made of heat-resistant steel, which may be hook-shaped, V-shaped, threaded, ball-headed or T-shaped; Nanoporous refractory castable (4): prepare refractory castable with a micron or nanometer-scale porous structure, which is filled with carbon nanotubes; Reinforcement rib plate (5): prepare a reinforcement rib plate (5) for connecting various components; Phase change thermal insulation layer (6): prepare a phase change thermal insulation material for thermal insulation; (2) Installing parts 10 to 15 light tubes (1) are arranged in parallel, with the spacing between each light tube (1) being 300 mm. The light tube (1) is the core part of the water-cooled wall and is responsible for absorbing the heat inside the boiler and removing it through the water flow. Heat-resistant gripping nails (3) are arranged alternately in the spacing area between the light tubes (1), and the gripping nails are fixed between each light tube (1) by welding. The function of the heat-resistant gripping nails (3) is to fix the sealing plate (2) and the nanoporous refractory castable (4). The sealing plate (2) is arranged on the heat-resistant side of the light tube (1), and each sealing plate (2) is connected by welding. The nanoporous refractory castable (4) is filled in the parallel spacing area on the heat-receiving side of the light tube (1). A reinforcing rib plate (5) is used to wrap the outer side of the heat-resistant gripping nail (3) and connect it to the sealing plate (2), the light tube (1) and other components. A phase change insulation layer (6) is arranged on the outermost layer of the water-cooled wall. (3) Assembly The upper water-cooling section (10), the middle water-cooling section (11) and the lower water-cooling section (12) are assembled respectively, the upper water-cooling section (10) adopts a composite membrane wall castable compartment design, the middle water-cooling section (11) adopts a composite membrane wall castable multi-compartment design, and the lower water-cooling section (12) can adopt a composite membrane wall or a composite membrane wall triangular block design, and the upper, middle and lower water-cooling sections (12) are connected by welding or other methods to form a complete composite water-cooling wall; (4) Testing and debugging After assembly, the composite water-cooled wall is tested and debugged to ensure that it can work normally and achieve the expected results. If any problems or abnormalities are found, they should be adjusted or repaired in time.

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