CN113483494A - Tower type photo-thermal heat absorption tube and method - Google Patents
Tower type photo-thermal heat absorption tube and method Download PDFInfo
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- CN113483494A CN113483494A CN202111047913.5A CN202111047913A CN113483494A CN 113483494 A CN113483494 A CN 113483494A CN 202111047913 A CN202111047913 A CN 202111047913A CN 113483494 A CN113483494 A CN 113483494A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
- F24S10/00—Solar heat collectors using working fluids
- F24S10/80—Solar heat collectors using working fluids comprising porous material or permeable masses directly contacting the working fluids
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/10—Sintering only
- B22F3/1003—Use of special medium during sintering, e.g. sintering aid
- B22F3/1007—Atmosphere
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/10—Sintering only
- B22F3/11—Making porous workpieces or articles
- B22F3/1121—Making porous workpieces or articles by using decomposable, meltable or sublimatable fillers
- B22F3/1137—Making porous workpieces or articles by using decomposable, meltable or sublimatable fillers by coating porous removable preforms
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D1/00—Electroforming
- C25D1/08—Perforated or foraminous objects, e.g. sieves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
- F24S70/00—Details of absorbing elements
- F24S70/10—Details of absorbing elements characterised by the absorbing material
- F24S70/12—Details of absorbing elements characterised by the absorbing material made of metallic material
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
- F24S70/00—Details of absorbing elements
- F24S70/20—Details of absorbing elements characterised by absorbing coatings; characterised by surface treatment for increasing absorption
- F24S70/225—Details of absorbing elements characterised by absorbing coatings; characterised by surface treatment for increasing absorption for spectrally selective absorption
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
- F24S70/00—Details of absorbing elements
- F24S70/60—Details of absorbing elements characterised by the structure or construction
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/40—Solar thermal energy, e.g. solar towers
- Y02E10/44—Heat exchange systems
Abstract
The invention belongs to the technical field of renewable energy power generation, and particularly relates to a tower type photo-thermal heat absorption tube and a method. The heat absorption pipe comprises a heat absorption coating, a heat exchange pipe and a metal foam layer; the heat absorption coating is attached to the outer wall surface of the heat exchange tube; the metal foam layer is connected on the inner wall of the heat exchange tube. The metal foam layer is an open-cell structure prepared by electroplating deposition or powder metallurgy, and the structure effectively disturbs the flowing state of liquid working media such as molten salt and the like in the metal foam layer, destroys a fluid boundary layer and improves the temperature gradient of fluid in the metal foam layer. Under the coupling action of the metal foam layer and the pure fluid region, high permeability gradient appears inside and outside the metal foam layer, the turbulence degree of a liquid working medium in the pure fluid region is improved, and the coupling heat exchange effect of radiation, heat conduction and forced convection heat transfer in the metal foam layer is enhanced; through improving heat absorber heat transfer efficiency and light and heat conversion efficiency, solved the heat absorption pipe wall because of lasting high temperature by the problem of burning through.
Description
Technical Field
The invention belongs to the technical field of oil well production, and particularly relates to a tower type photothermal heat absorption tube and a method.
Background
The tower type solar thermal power generation is characterized in that sunlight is reflected to a heat absorber through a mirror field, a heat absorbing medium is heated to more than 500 ℃ through the heat absorber, heat energy is transferred to a water working medium through an evaporation heat exchange system, generated superheated steam enters a steam turbine set to do work and generate power, and a light-gathering heat collecting system is a key subsystem in the tower type solar thermal power station and is responsible for photo-thermal conversion. At present, the biggest bottleneck in the promotion work of the first national solar thermal power generation demonstration project is that the cost of a light-gathering and heat-collecting system is high, which accounts for about 50% of the construction cost of a tower type solar thermal power station, so that the power cost of the tower type solar thermal power generation reaches 1 yuan/kWh. Therefore, the heat absorber needs to be optimally designed, the heat collection performance of the heat absorber is improved, the construction cost of the mirror field and the heat storage system is reduced, and the power generation efficiency of the power station is improved.
The heat exchanger with the circular tube surface as the solar radiation heat absorption surface is an exposed tube type heat absorber and is annularly arranged by a row of heat absorption tubes, and the partial outer surfaces of the heat absorption tubes absorb sunlight reflected by a mirror field, so that the radiation energy is converted into heat energy and is transferred to a heat absorption medium in the tubes. The existing exposed tube type heat absorber has high requirements on mirror field reflection focusing precision, needs to accurately predict and track solar radiation conditions in real time, and still has the defects that the local light-gathering energy of the heat absorber is too high, so that the heat stress of the heat absorber is too large, even a heat absorption tube is burnt through and leaked, and the potential safety hazard of operation exists; meanwhile, the current heat absorber adopts a circular tube as a basic heat exchange unit, and the problem of low heat exchange performance of a heat absorbing medium and the circular tube exists.
Disclosure of Invention
The invention provides a tower type photo-thermal heat absorption tube and a method, and aims to provide a novel tower type photo-thermal heat absorption tube which can improve the light-gathering and heat-collecting efficiency while homogenizing the surface temperature graduation of a heat absorber.
In order to achieve the purpose, the invention adopts the technical scheme that:
a tower type photo-thermal heat absorption tube comprises a heat absorption coating, a heat exchange tube and a metal foam layer; the heat absorption coating is attached to the surface of the outer wall of the heat exchange tube; the metal foam layer is connected to the inner wall of the heat exchange tube, and a pure fluid area in the tube is formed in the metal foam layer.
The heat exchange tube is a nickel-based stainless steel round tube.
The heat absorption coating is made of a high-temperature heat absorption body coating material, and the solar energy absorptivity of the high-temperature heat absorption body coating material is 0.95-0.99 at 600 ℃ and the emissivity is not more than 0.35.
And a plurality of holes for flowing water or molten salt liquid medium are arranged in the metal foam layer.
The porosity in the metal foam layer is 0.85-0.95, and the pore density is 5-100 PPI.
The radial section of the metal foam layer in the heat exchange tube is in a semi-annular shape, and the thickness of the metal foam layer is 0.1-0.4 times of the inner diameter of the heat exchange tube.
The radial section of the metal foam layer in the heat exchange tube is annular, and the thickness of the metal foam layer is 0.1-0.4 times of the inner diameter of the heat exchange tube.
A preparation method of a tower type photothermal heat absorption tube comprises the following steps,
the method comprises the following steps: preparing a metal foam layer;
step two: spraying a heat absorption coating on the outer surface of the heat exchange tube;
step three: and (4) assembling the metal foam layer prepared in the step one on the inner surface of the heat exchange tube.
The preparation method of the metal foam layer in the first step comprises the following steps: the method comprises the steps of electroplating and depositing liquid copper metal outside organic foam, volatilizing at high temperature of more than 400 ℃ and cooling below 200 ℃ to form open-cell solid copper foam or doping metal carbon nano tubes in solid nano nickel-based stainless steel powder according to the volume ratio of 4%, slurrying in the organic foam, heating to 400-450 ℃ in a vacuum hydrogen furnace to volatilize the organic foam, heating to 1100-1200 ℃ for sintering and forming, cooling at low temperature of below 200 ℃ to form cuboid solid nickel-based stainless steel open-cell foam, and preparing into a ring or a semi-ring by external wire cutting and internal and external wire cutting.
The metal foam layer and the heat exchange tube are connected into a whole through high-temperature vacuum brazing at the temperature of more than 800 ℃; the welding flux adopts nickel-based brazing filler metal which can resist temperature of more than 1000 ℃, and the thickness of the nickel-based brazing filler metal between the metal foam layer and the heat exchange tube is less than 40 mu m.
Has the advantages that:
(1) the metal foam layer is formed by doping solid nano nickel-based stainless steel powder with trace metal type carbon nano tubes, sintering the solid nano nickel-based stainless steel powder outside an organic foam body through a vacuum high-temperature furnace, and volatilizing at high temperature and cooling at low temperature to form solid nickel-based stainless steel foam. The nickel-based stainless steel foam doped with the metal type carbon nano tube has the advantages of high heat conductivity coefficient, stable three-dimensional structure, high strength, high modulus, high temperature resistance, small thermal expansion coefficient, strong thermal deformation resistance and the like. The metal foam layer is of an open-cell structure, liquid media such as water and molten salt can flow through the metal foam layer, and the metal foam effectively disturbs the flowing state of liquid working media such as the molten salt in the metal foam layer by virtue of the characteristics of high specific surface area, large heat conductivity coefficient, three-dimensional through hole structure and the like, so that a fluid boundary layer is remarkably damaged, and the temperature gradient of fluid in the metal foam layer is further improved.
(2) Under the coupling action of the metal foam layer and the pure fluid area in the pipe, on one hand, the heat exchange effect of the fluid and the metal foam framework can be enhanced through radiation, heat conduction and forced convection heat transfer mechanisms in the metal foam layer; on the other hand, the turbulence degree of the liquid working medium in the pure fluid region can be improved through the high permeability gradient inside and outside the metal foam layer, and the heat transfer efficiency of the fluid in the region is improved.
(3) According to the invention, the temperature distribution of the wall of the heat absorption pipe is homogenized through the metal foam layer, the average temperature of the surface of the heat absorption pipe is reduced, the heat dissipation capacity of the heat absorber in a high-altitude environment of a heat absorption tower (more than 150 m) is obviously reduced, and the photo-thermal conversion efficiency of the heat absorption pipe is improved.
(4) Compared with the heat absorption tube with a smoother circular tube, the heat absorption tube realizes the rapid heat transfer of the tube wall of the heat absorption tube and the rapid temperature reduction of the tube wall, and avoids the phenomenon that the tube wall of the heat absorption tube is burnt through due to continuous high temperature under the condition of extreme light condensation.
The foregoing is merely an overview of the technical solutions of the present invention, and in order to make the technical solutions of the present invention more clearly understood and to be implemented in accordance with the content of the description, the following is a detailed description of preferred embodiments of the present invention.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
FIG. 1 is a radial cross-sectional view of a filled semi-annular metal foam layer of the present invention;
FIG. 2 is a radial cross-sectional view of a filled annular metal foam layer of the present invention;
FIG. 3 is a graph showing the relationship between the heat-absorbing tube diameter and the heat-transfer characteristic of the smooth heat-absorbing tube diameter of the heat-absorbing tube filled with the annular metal foam layer according to the present invention;
in the figure: 1-a heat-absorbing coating; 2-heat exchange tube; 3-a metal foam layer; 4-a pure fluid zone within the tube;
Tpipe wallThe temperature of the inner wall of the heat absorption tube is unit DEG C;
Tfluid, especially for a motor vehicleThe temperature of a heat absorbing medium in the heat absorbing pipe is in a unit of DEG C;
qpipe wallIs the heat flux density of the inner wall of the heat absorption tubeW/m2。
The foregoing is only an overview of the technical solutions of the present invention, and in order to make the technical solutions of the present invention more clear and clear, and to implement them in accordance with the content of the description, the following is a detailed description of preferred embodiments of the present invention.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The first embodiment is as follows:
referring to fig. 1 and 2, the tower type photothermal heat absorption tube includes a heat absorption coating 1, a heat exchange tube 2 and a metal foam layer 3; the heat absorption coating 1 is attached to the outer wall surface of the heat exchange tube 2; the metal foam layer 3 is connected on the inner wall of the heat exchange tube 2, and a pure fluid area 4 in the tube is formed in the metal foam layer 3.
When the heat absorption coating is specifically applied, the heat absorption coating 1 is attached to the surface of the outer wall of the heat exchange tube 2, the heat absorption effect of the heat exchange tube 2 is effectively enhanced, the metal foam layer 3 is connected to the inner wall of the heat exchange tube 2, the turbulence degree of a liquid working medium in the pure fluid region 4 is improved through the high permeability gradient inside and outside the metal foam layer 3, and the heat transfer efficiency of the fluid in the region is improved. The metal foam layer 3 realizes the homogenization of the temperature distribution of the tube wall of the heat exchange tube 2. The metal foam layer 3 reduces the average temperature of the surface of the heat absorption pipe, obviously reduces the heat dissipation capacity of the heat absorption pipe in the high-altitude environment of the heat absorption tower (more than 150 m), and improves the photo-thermal conversion efficiency of the heat absorber.
As is apparent from fig. 3, after the annular metal foam layer is arranged, compared with the smooth heat absorption pipe, the temperature difference between the pipe wall and the fluid is remarkably increased near the pipe wall, the heat transfer performance is improved, and the heat of the pipe wall is more effectively and quickly transferred to the heat absorption fluid.
Example two:
referring to fig. 1 and 2, in the first embodiment, the heat exchange tube 2 is a circular tube made of nickel-based stainless steel.
Further, the heat absorption coating 1 is made of a high-temperature heat absorption body coating material, and the high-temperature heat absorption body coating material has a solar energy absorptivity of 0.95-0.99 and an emissivity of no more than 0.35 at 600 ℃.
In practical use, the heat absorption coating 1 adopting the technical scheme can selectively absorb solar radiation, effectively increase the solar absorption rate of the nickel-based stainless steel circular heat exchange tube 2 and reduce the radiation heat loss of the high-temperature nickel-based stainless steel circular heat exchange tube 2 to the environment.
The high temperature heat absorber coating material in this embodiment may be a prior art black chrome coating material.
Example three:
referring to fig. 1 and 2, in the tower type photothermal heat absorption tube, on the basis of the first embodiment, a plurality of holes for flowing water or molten salt liquid medium are formed in the metal foam layer 3.
In practical use, the metal foam layer 3 with the open-cell structure can be used for flowing liquid media such as water, molten salt and the like, and by means of the metal foam layer with the characteristics of high specific surface area, large heat conductivity coefficient, three-dimensional through hole structure and the like, the flowing state of liquid working media such as the molten salt and the like in the metal foam layer is effectively disturbed, a fluid boundary layer is obviously damaged, and the temperature gradient of fluid in the metal foam layer is further improved.
Under the coupling action of the metal foam layer 3 and the pure fluid area 4 in the pipe, on one hand, the heat exchange effect of the fluid and the metal foam framework can be enhanced through radiation, heat conduction and forced convection heat transfer mechanisms in the metal foam layer; on the other hand, the turbulence degree of the liquid working medium in the pure fluid region can be improved through the high permeability gradient inside and outside the metal foam layer, and the heat transfer efficiency of the fluid in the region is improved.
The plurality of holes are formed by electroplating and depositing liquid copper metal outside the organic foam body, volatilizing the organic foam body at a high temperature of more than 400 ℃, and cooling the organic foam body at a temperature of less than 200 ℃, or doping metal carbon nanotubes in solid nano nickel-based stainless steel powder according to a volume ratio of 4%, slurrying the mixture in the organic foam body, heating the mixture in a vacuum hydrogen furnace to a high temperature of 400-450 ℃, volatilizing the organic foam body, heating the mixture to a temperature of 1100-1200 ℃, sintering and forming the mixture, and cooling the mixture at a temperature of less than 200 ℃.
Example four:
referring to fig. 1 and 2, in the tower type photothermal heat absorption tube, based on the first embodiment or the third embodiment, the porosity in the metal foam layer 3 is between 0.85 and 0.95, and the pore density is between 5 and 100 PPI.
In practical use, the metal foam with the porosity of less than 0.85 or the pore density of more than 100PPI can cause the permeability to be too low, and the metal foam layer 3 can only improve the heat conduction effect in the pipe, but increases the thickness of the fluid boundary layer and greatly improves the flow resistance of the liquid working medium. Therefore, in the first embodiment or the third embodiment, the heat exchange capacity of the heat absorption pipe can be strongest under the same pump power by designing the rated heat absorption capacity of the heat absorption pipe and adopting the metal foam layer 3 with the optimal porosity and pore density parameters.
The number of cells per inch of length of PPI may be selected from 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, 65, 70, 75, 80, 85 or 90. The porosity may be selected to be 0.85, 0.9, or 0.95 equivalents.
Example five:
referring to fig. 1 and 2, in the tower type photothermal heat absorption tube, on the basis of the first embodiment or the fourth embodiment, the radial section of the metal foam layer 3 in the heat exchange tube 2 is a semi-annular shape, and the thickness of the metal foam layer 3 is 0.1-0.4 times of the inner diameter of the heat exchange tube 2.
Furthermore, the radial section of the metal foam layer 3 in the heat exchange tube 2 is annular, and the thickness of the metal foam layer 3 is 0.1-0.4 times of the inner diameter of the heat exchange tube 2.
In practical use, the metal foam layer 3 has a semi-annular or annular radial section, which can be selected according to the practical situation of the use site. Aiming at the heat absorber with the heat absorption power below 200MW and the central elevation of 150 m-200 m, the semi-annular technical scheme is adopted, and the heat absorption power of the heat absorption tube is improved to the greatest extent. Aiming at the heat absorber with the heat absorption power of more than 200MW and the central elevation of more than 200m, the semi-annular technical scheme is adopted, the pumping work of the heat absorption medium is reduced to the maximum extent, and the operating efficiency of the heat collection system is improved.
By adopting the technical scheme, the uniform temperature distribution of the tube wall of the heat exchange tube 2 is realized through the metal foam layer 3, the average temperature of the surface of the heat absorption tube is reduced, the heat dissipation capacity of the heat absorption tube in a high-altitude environment of a heat absorption tower (more than 150 m) is remarkably reduced, and the photo-thermal conversion efficiency of the heat absorption tube is improved.
The thickness of the metal foam layer 3 may be 0.1, 0.2, 0.3 or 0.4 times the inner diameter of the heat exchange tube 2 for a particular application.
When the metal foam layer 3 is semi-annular in radial cross section, the metal foam layer 3 should be arranged on the light-condensing side.
Example six:
a preparation method of a tower type photothermal heat absorption tube comprises the following steps,
the method comprises the following steps: preparing a metal foam layer 3;
step two: a layer of heat absorption coating 1 is sprayed on the outer surface of the heat exchange tube 2;
step three: and (3) assembling the metal foam layer 3 prepared in the step one on the inner surface of the heat exchange tube 2.
Further, the preparation method of the metal foam layer 3 in the step one comprises the following steps: the method comprises the steps of electroplating and depositing liquid copper metal outside organic foam, volatilizing at high temperature of more than 400 ℃ and cooling below 200 ℃ to form open-cell solid copper foam or doping metal carbon nano tubes in solid nano nickel-based stainless steel powder according to the volume ratio of 4%, slurrying in the organic foam, heating to 400-450 ℃ in a vacuum hydrogen furnace to volatilize the organic foam, heating to 1100-1200 ℃ for sintering and forming, cooling at low temperature of below 200 ℃ to form cuboid solid nickel-based stainless steel open-cell foam, and preparing into a ring or a semi-ring by external wire cutting and internal and external wire cutting.
Further, the metal foam layer 3 and the heat exchange tube 2 are connected into a whole by high-temperature vacuum brazing at the temperature of more than 800 ℃; the welding flux adopts nickel-based brazing filler metal which can resist temperature of more than 1000 ℃, and the thickness of the nickel-based brazing filler metal between the metal foam layer 3 and the heat exchange tube 2 is lower than 40 mu m.
In practical use, the metal foam layer 3 adopts an open-cell structure, so that liquid media such as water, molten salt and the like can flow through, and the metal foam layer 3 effectively disturbs the flowing state of liquid working media such as the molten salt and the like in the metal foam layer by virtue of the characteristics of high specific surface area, large heat conductivity coefficient, three-dimensional through hole structure and the like, so that a fluid boundary layer is remarkably damaged, and the temperature gradient of fluid in the metal foam layer is further improved.
Under the coupling action of the metal foam layer 3 and the pure fluid area 4 in the pipe, on one hand, the heat exchange effect of the fluid and the metal foam framework can be enhanced through radiation, heat conduction and forced convection heat transfer mechanisms in the metal foam layer; on the other hand, the turbulence degree of the liquid working medium in the pure fluid region can be improved through the high permeability gradient inside and outside the metal foam layer, and the heat transfer efficiency of the fluid in the region is improved.
The metal foam layer 3 realizes the homogenization of the temperature distribution of the wall of the heat absorption pipe, reduces the average temperature of the surface of the heat absorption pipe, obviously reduces the heat dissipation capacity of the heat absorber in the high-altitude environment of the heat absorption tower (more than 150 m), and improves the photo-thermal conversion efficiency of the heat absorption pipe.
Compared with the heat absorption tube with a smoother circular tube, the heat absorption tube realizes the rapid heat transfer of the tube wall of the heat absorption tube and the rapid temperature reduction of the tube wall, and avoids the phenomenon that the tube wall of the heat absorption tube is burnt through due to continuous high temperature under the condition of extreme light condensation.
The thickness of the brazing filler metal between the metal foam layer 3 and the heat exchange tube 2 is lower than 40 mu m, so that the thickness of the brazing filler metal formed by the traditional welding processing method is greatly reduced, on one hand, the blockage rate of the brazing filler metal in the through holes at the bottom of the metal foam layer 3 is reduced, and the heat exchange area of the liquid working medium is increased; on the other hand, the thermal contact resistance between the metal foam layer 3 and the heat exchange tube 2 is obviously reduced, and the heat exchange capacity of the heat absorption tube is improved.
The nickel-based brazing filler metal is the prior art, the nickel-based brazing filler metal Ni612 is adopted in the nickel-based brazing filler metal in the embodiment, and the nickel-based brazing filler metal can be selected according to actual needs in actual application.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
In the case of no conflict, a person skilled in the art may combine the related technical features in the above examples according to actual situations to achieve corresponding technical effects, and details of various combining situations are not described herein.
The foregoing is illustrative of the preferred embodiments of the present invention, and the present invention is not to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein. Any simple modification, equivalent change and modification of the above embodiments according to the technical spirit of the present invention still fall within the scope of the technical solution of the present invention.
Claims (10)
1. A tower photothermal heat absorption tube is characterized in that: comprises a heat absorption coating (1), a heat exchange tube (2) and a metal foam layer (3); the heat absorption coating (1) is attached to the outer wall surface of the heat exchange tube (2); the metal foam layer (3) is connected to the inner wall of the heat exchange tube (2), and a pure fluid area (4) in the tube is formed in the metal foam layer (3).
2. The tower photothermal heat absorbing tube of claim 1 wherein: the heat exchange tube (2) is a nickel-based stainless steel circular tube.
3. The tower photothermal heat absorbing tube of claim 1 wherein: the heat absorption coating (1) is made of a high-temperature heat absorption body coating material, and the solar energy absorptivity of the high-temperature heat absorption body coating material is 0.95-0.99 at 600 ℃, and the emissivity of the high-temperature heat absorption body coating material is not more than 0.35.
4. The tower photothermal heat absorbing tube of claim 1 wherein: a plurality of holes for flowing water or molten salt liquid medium are arranged in the metal foam layer (3).
5. The tower photothermal heat absorbing tube of claim 1 wherein: the porosity of the metal foam layer (3) is 0.85-0.95, and the pore density is 5-100 PPI.
6. The tower photothermal heat absorbing tube of claim 1, 4 or 5 wherein: the radial section of the metal foam layer (3) in the heat exchange tube (2) is in a semi-annular shape, and the thickness of the metal foam layer (3) is 0.1-0.4 times of the inner diameter of the heat exchange tube (2).
7. The tower photothermal heat absorbing tube of claim 1, 4 or 5 wherein: the radial section of the metal foam layer (3) in the heat exchange tube (2) is annular, and the thickness of the metal foam layer (3) is 0.1-0.4 times of the inner diameter of the heat exchange tube (2).
8. The method for producing a tower photothermal heat absorbing tube according to any one of claims 1 to 7, comprising the steps of,
the method comprises the following steps: preparing a metal foam layer (3);
step two: a layer of heat absorption coating (1) is sprayed on the outer surface of the heat exchange tube (2);
step three: and (3) assembling the metal foam layer (3) prepared in the step one on the inner surface of the heat exchange tube (2).
9. The method for manufacturing a tower type photothermal heat absorbing tube according to claim 8, wherein the metal foam layer (3) in the first step is manufactured by: the method comprises the steps of electroplating and depositing liquid copper metal outside organic foam, volatilizing at high temperature of more than 400 ℃ and cooling below 200 ℃ to form open-cell solid copper foam or doping metal carbon nano tubes in solid nano nickel-based stainless steel powder according to the volume ratio of 4%, slurrying in the organic foam, heating to 400-450 ℃ in a vacuum hydrogen furnace to volatilize the organic foam, heating to 1100-1200 ℃ for sintering and forming, cooling at low temperature of below 200 ℃ to form cuboid solid nickel-based stainless steel open-cell foam, and preparing into a ring or a semi-ring by external wire cutting and internal and external wire cutting.
10. The method for manufacturing a tower type photothermal heat absorbing tube according to claim 8, wherein: the metal foam layer (3) and the heat exchange tube (2) are connected into a whole by high-temperature vacuum brazing at the temperature of more than 800 ℃; the welding flux adopts nickel-based brazing filler metal which can resist temperature of more than 1000 ℃, and the thickness of the nickel-based brazing filler metal between the metal foam layer (3) and the heat exchange tube (2) is less than 40 mu m.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114485244A (en) * | 2022-02-14 | 2022-05-13 | 中国电建集团华东勘测设计研究院有限公司 | Thermal diode, thermal rectifying coating, phase-change heat storage and supply device and heat monitoring method |
| CN114485244B (en) * | 2022-02-14 | 2023-10-13 | 中国电建集团华东勘测设计研究院有限公司 | Thermal diode, thermal rectification coating, phase-change heat storage and supply device and heat monitoring method |
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