CN109140791B - Stacked solar cavity heat absorber - Google Patents
Stacked solar cavity heat absorber Download PDFInfo
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- CN109140791B CN109140791B CN201811033794.6A CN201811033794A CN109140791B CN 109140791 B CN109140791 B CN 109140791B CN 201811033794 A CN201811033794 A CN 201811033794A CN 109140791 B CN109140791 B CN 109140791B
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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
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Abstract
The invention discloses a laminated solar cavity heat absorber which comprises a cavity shell, a first medium shunt pipe, a second medium shunt pipe, a heat exchange pipe assembly, heat insulation cotton, a flow control device and a heat exchange coil. The cavity heat absorber realizes the shunting function of a heat exchange medium through the mutual matching of the two medium shunting pipes, the heat exchange coil and the plurality of heat exchange pipe assemblies arranged in a stacked mode, when the temperature of a certain heat exchange pipe assembly is overhigh due to solar radiation, the flow control device can correspondingly increase the flow and the flow speed of the heat exchange medium and take away the heat of the heat exchange pipe assembly in time, and therefore the problems of heat exchange pipe burnthrough, internal corrosion and the like caused by overhigh local temperature of the cavity heat absorber are effectively solved; moreover, the heat exchange coil arranged above the heat exchange tube assembly can fill the gap of the heat exchange tube assembly, and solves the problem that the spiral metal heat exchange tube has a sunlight radiation absorption dead zone, so that the cavity heat absorber can further improve the utilization rate of sunlight.
Description
Technical Field
The invention relates to the technical field of solar photo-thermal utilization, in particular to a laminated solar cavity heat absorber.
Background
Solar energy is a clean and environment-friendly renewable energy source, and the solar photo-thermal utilization technology is a popular research direction all the time. However, since the energy flux density of solar radiation is too low to be directly utilized, people often gather a large area of sunlight through a photo-thermal energy conversion device, and then perform photo-thermal energy conversion on the sunlight, so as to perform the next utilization such as heat exchange or power generation. The cavity heat absorber is a core component of the photo-thermal energy conversion device, has an important influence on the operation of the whole photo-thermal energy conversion device, and mainly plays a role in collecting sunlight and conducting heat.
The appearance of the existing cavity heat absorber is cylindrical, flat-top conical, composite flat-top conical, spherical and the like, but the working principle is approximately the same, a metal heat exchange tube which is coiled into a spiral shape is generally arranged in the cavity heat absorber, a heat exchange medium flows in the metal heat exchange tube, solar radiation is carried out on the outer surface of the metal heat exchange tube, so that heat energy is conducted to the heat exchange medium, and the heat exchange medium is conveyed to the solar heat energy in a circulating flowing mode, so that the heat energy is utilized on the next step.
However, in the actual manufacturing and coiling process of the spiral metal heat exchange tube, the curvature of the vertex is too large, so that the metal heat exchange tube cannot be distributed in the whole heat absorber, and the cavity heat absorber has the problem of an absorption dead zone of solar radiation. Moreover, because the metal heat exchange tube is formed by coiling a single pipeline, a heat exchange medium in the heat exchange tube can only flow along one direction, and once the condition of uneven illumination appears, if the heat exchange medium can not take away the heat energy rapidly, the local temperature of the heat exchange tube is too high, so that the problems of burning through, internal corrosion and scaling of the metal heat exchange tube are caused, and the working safety and performance of the heat absorber are seriously influenced.
Therefore, how to more effectively utilize solar radiation and overcome the defect of local over-high temperature of the metal heat exchange tube is an important research topic for those skilled in the art.
Disclosure of Invention
The invention aims to solve the technical problems that a laminated solar cavity heat absorber is provided to solve the problems that a cavity heat absorber has a sunlight radiation absorption dead zone and the local temperature of a metal heat exchange tube is overhigh due to the fact that the existing cavity heat absorber adopts a spiral metal heat exchange tube.
In order to achieve the above purpose, the present invention provides the following technical solutions:
a laminated solar cavity heat absorber comprises a cavity shell, wherein the cavity shell is a lower open type shell;
a first medium shunt pipe and a second medium shunt pipe are arranged in the cavity shell; a plurality of annular heat exchange tube components which are arranged in a stacked mode are communicated between the first medium shunt tube and the second medium shunt tube; heat insulation cotton is filled between the cavity shell and the heat exchange tube assembly;
the second medium flow dividing pipe is provided with a plurality of flow control devices which correspond to the heat exchange pipe components one by one; the flow control device controls the flow of the heat exchange tube assembly independently;
the top surface of the heat exchange tube assembly positioned at the top layer is also provided with a heat exchange coil, and the two opposite sides of the heat exchange coil are respectively communicated with the first medium shunt tube and the second medium shunt tube;
optionally, the heat exchange tube assembly comprises two semicircular heat absorption tubes and two three-way tubes, and the two heat absorption tubes are connected into a circular ring shape through the two three-way tubes; the heat exchange tube assembly is communicated with the first medium shunt tube and the second medium shunt tube through the three-way tube.
The flow control device comprises a control element, a temperature measurement module for detecting the temperature of the heat exchange medium and an electromagnetic valve for regulating and controlling the flow; the control element is respectively and electrically connected with the temperature measuring module and the electromagnetic valve.
Optionally, a reflecting device is attached to a gap between the two heat exchange tube assemblies by the heat insulation cotton; the reflecting device is used for reflecting sunlight passing through the gap of the heat exchange tube assembly to the heat exchange tube assembly again;
the reflecting device can be a reflector or a plate coated with a reflecting coating on the surface or a plate stuck with a reflecting film on the surface.
Optionally, a heat storage device is further arranged between the heat exchange tube assembly and the heat insulation cotton, and the heat storage device is used for storing excessive radiation heat.
Optionally, the heat preservation cotton is slag cotton or rock wool.
Optionally, the heat exchange tube assembly and the outer surface of the heat exchange coil are coated with heat absorption coatings.
Optionally, the heat absorption coating is a black chromium coating or a black nickel coating.
Compared with the prior art, the invention has the following beneficial effects:
the invention provides a laminated solar cavity heat absorber, which realizes the shunting function of a heat exchange medium by the mutual matching of two medium shunt pipes, a heat exchange coil pipe and a plurality of heat exchange pipe assemblies arranged in a laminated manner, when the temperature of a certain heat exchange pipe assembly is overhigh due to solar radiation, a flow control device corresponding to the heat exchange pipe assembly can correspondingly increase the flow and the flow velocity of the heat exchange medium and take away the heat of the heat exchange pipe assembly in time, thereby effectively solving the problems of heat exchange pipe burning-through, internal corrosion and scaling caused by overhigh local temperature of the cavity heat absorber; moreover, the heat exchange coil arranged above the heat exchange tube assembly can fill the gap of the heat exchange tube assembly, and solves the problem that the spiral metal heat exchange tube has a sunlight radiation absorption dead zone, so that the cavity heat absorber can further improve the utilization rate of sunlight.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art 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 for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.
Fig. 1 is a schematic structural diagram of a stacked solar cavity heat absorber provided by the present invention;
FIG. 2 is a schematic structural view of a heat exchange tube assembly in an embodiment;
FIG. 3 is a schematic structural view of another stacked solar cavity heat absorber provided by the present invention
Fig. 4 is a schematic structural view of a further stacked solar cavity heat absorber provided by the present invention.
Illustration of the drawings:
1. a cavity housing; 2. a first media shunt tube; 3. a second media shunt tube; 4. a heat exchange tube assembly; 5. heat preservation cotton; 6. a flow control device; 7. a heat exchange coil; 8. a heat absorbing tube; 9. a three-way pipe; 10. a reflecting device; 11. a heat storage device; 12. a branch valve.
Detailed Description
In order to make the objects, features and advantages of the present invention more obvious and understandable, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the embodiments described below 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.
In the description of the present invention, it is to be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. When a component is referred to as being "disposed on" another component, it can be directly on the other component or intervening components may also be present.
Furthermore, the terms "long", "short", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of describing the present invention, but do not indicate or imply that the referred devices or elements must have the specific orientations, be configured to operate in the specific orientations, and thus are not to be construed as limitations of the present invention.
The technical scheme of the invention is further explained by the specific implementation mode in combination with the attached drawings.
The first embodiment is as follows:
referring to fig. 1 and fig. 2, the embodiment provides a stacked solar cavity heat absorber, including a cavity housing 1, where the cavity housing 1 is a lower open type shell;
it should be noted that, in practical application, the lower opening of the cavity heat absorber is a light inlet, and sunlight can be irradiated into the cavity heat absorber through the light inlet;
specifically, a first medium shunt pipe 2 and a second medium shunt pipe 3 are arranged in the cavity shell 1; a plurality of annular heat exchange tube components 4 which are arranged in a stacked mode are communicated between the first medium shunt tube 2 and the second medium shunt tube 3; heat insulation cotton 5 is filled between the cavity shell 1 and the heat exchange tube assembly 4;
the heat insulation cotton 5 can be slag cotton, rock wool, or other materials with heat insulation function, and in this embodiment, the heat insulation cotton 5 mainly adopts slag cotton; the slag wool has the characteristics of light weight, small heat conductivity coefficient, no combustion, moth prevention, low price, corrosion resistance, good chemical stability, good sound absorption performance and the like, and can effectively prevent heat loss in the cavity.
The second medium shunt pipe 3 is provided with a plurality of flow control devices 6 which correspond to the heat exchange pipe assemblies 4 one by one; the flow control device 6 controls the flow of the heat exchange tube assembly 4 independently;
specifically, the radiuses of the plurality of heat exchange tube assemblies 4 decrease gradually from bottom to top layer by layer, and the plurality of heat exchange tube assemblies 4 are integrally stacked to form a cone;
it should be particularly noted that the cavity shape of the cavity heat absorber can include various shapes, such cavity shapes are mainly rotationally symmetric shapes, while the conical cavity given in the present embodiment is only one of the cavity heat absorbers; in addition, the installation mode of stacking a plurality of heat exchange tube components can be suitable for manufacturing all cavity heat absorbers with rotational symmetric structures;
the top surface of the heat exchange tube assembly 4 positioned at the top layer is also provided with a flat plate type heat exchange coil 7, and two opposite sides of the heat exchange coil 7 are respectively communicated with the first medium shunt tube 2 and the second medium shunt tube 3.
Specifically, the heat exchange medium flows into the cavity heat absorber through the inlet end of the first medium shunt pipe 2, is shunted immediately, passes through the heat exchange pipe assembly 4 and the heat exchange coil 7 respectively, and finally leaves the cavity heat absorber from the outlet end of the second medium shunt pipe 3.
It should be noted that the heat exchange coil 7 is only a preferred way to solve the problem of heat absorption dead zone, and specifically, the heat exchange coil 7 may be replaced by a component having sunlight reflection, such as a reflecting cone, a plane mirror, etc.
The invention provides a laminated solar cavity heat absorber, which realizes the shunting function of a heat exchange medium by the mutual matching of two medium shunt pipes, a heat exchange coil 7 and a plurality of heat exchange pipe assemblies 4 arranged in a laminated manner, when the temperature of a certain heat exchange pipe assembly 4 is overhigh due to solar radiation, a flow control device 6 corresponding to the heat exchange pipe assembly 4 can correspondingly increase the flow and the flow speed of the heat exchange medium and take away the heat of the heat exchange pipe assembly 4 in time, thereby effectively solving the problems of heat exchange pipe burnthrough, internal corrosion and scaling caused by overhigh local temperature of the cavity heat absorber; moreover, the heat exchange coil 7 arranged above the heat exchange tube assembly 4 can fill the gap of the heat exchange tube assembly 4, and the problem that the spiral metal heat exchange tube has a sunlight radiation absorption dead zone is solved, so that the cavity heat absorber can further improve the utilization rate of sunlight.
Further, the present embodiment should not be limited thereto, and the present embodiment further includes:
and heat absorption coatings are coated on the outer surfaces of the heat exchange tube assembly 4 and the heat exchange coil 7. The heat absorption coating can more efficiently convert sunlight irradiated into the heat absorber of the cavity into heat energy, and indirectly improves the working efficiency of the heat exchange medium; the heat absorbing coating may be a black chromium coating, a black nickel coating, or other coating having a heat absorbing function, and this embodiment is not limited in this respect.
The heat exchange tube assembly 4 comprises two semicircular heat absorption tubes 8 and two three-way tubes 9, and the two heat absorption tubes 8 are connected into a circular ring shape through the two three-way tubes 9; the heat exchange tube assembly 4 is communicated with the first medium shunt tube 2 and the second medium shunt tube 3 through the three-way tube 9.
It should be noted that the heat exchange tube assembly 4 adopts a split type manufacturing process, the heat absorption tube 8 and the three-way tube 9 are simple to assemble, the heat absorption tube 8 has more uniform quality, and can be repeatedly manufactured, thereby facilitating batch production; moreover, after the heat exchange tube assembly 4 is assembled, the heat absorption coating can be sprayed on the inner side of the cavity heat absorber only by arranging the heat exchange tube assembly 4 in sequence according to the designed shape and size of the cavity heat absorber, and compared with the integrally formed spiral metal heat exchange tube, the spraying mode of the embodiment can be used for more easily and uniformly spraying the heat absorption coating, so that the production efficiency is effectively improved.
It should be noted that, in the use process of the traditional cavity heat absorber, once the spiral metal heat exchange tube has the problems of burning through, blocking, corrosion and the like, although only a small section of the metal heat exchange tube has the problems, only one method for repairing the spiral heat exchange tube is needed, namely, a whole metal heat exchange tube is replaced, and the problems of waste and increased maintenance cost are inevitably caused by replacing parts in a large area. However, according to the stacked solar cavity heat absorber provided by the invention, as the heat exchange tube assembly 4 in the cavity heat absorber adopts a split manufacturing process, once one heat absorption tube 8 has the problems of burnthrough, blockage, corrosion and the like, the heat absorption tube 8 with the corresponding curvature and radius can be used for replacement, and parts do not need to be replaced in a large area, so that the problems caused by the above conditions are solved, and the effects of quickly replacing the parts and reducing the maintenance cost are achieved.
Further, as shown in fig. 1, the first medium flow dividing pipe 2 is further provided with a plurality of branch valves 12 corresponding to the heat exchange pipe assemblies 4 one by one; the branch valve 12 controls the corresponding heat exchange tube assembly 4 independently;
it should be noted that the plurality of branch valves 12 are used for closing the branch valves 12 corresponding to the heat absorption pipes 8 in time by maintenance personnel once a certain heat absorption pipe 8 is convenient to burn through and leak, and replacing the heat absorption pipe 8 with a problem in time under the condition that normal operation of other branches is not affected, so that a fault is solved under the condition of no shutdown, normal operation of production is guaranteed to the greatest extent, and the branch valves 12 have important significance for certain workplaces such as power plants.
Further, the flow control device 6 comprises a control element, a temperature measuring module for detecting the temperature of the heat exchange medium, and an electromagnetic valve for regulating the flow; the control element is respectively and electrically connected with the temperature measuring module and the electromagnetic valve.
Through the mutual cooperation of the control element, the temperature measuring module and the electromagnetic valve, unmanned operation can be realized, and the working efficiency of the cavity heat absorber is further improved.
Example two:
referring to fig. 3, on the basis of the first embodiment, the present embodiment is optimized as follows:
the heat insulation cotton 5 is attached with a reflecting device 10 at a gap between the two heat exchange tube assemblies 4; the reflecting device 10 is used for reflecting sunlight passing through the gap of the heat exchange tube assembly 4 to the heat exchange tube assembly 4 again;
the reflecting device 10 can be a reflector or a plate coated with a reflective coating on the surface or a plate stuck with a reflective film on the surface.
It can be understood that most of the sunlight entering from the daylight opening is directly absorbed by the heat exchange medium in the heat exchange tube assembly 4 or the heat exchange coil 7 and converted into heat energy, but in practical application, part of the sunlight also passes through between the heat exchange tube assembly 4, and the reflecting device 10 is used for reflecting the part of the sunlight so that the part of the sunlight irradiates on the heat exchange tube assembly 4 or the heat exchange coil 7 again, thereby further improving the utilization rate of the sunlight.
Example three:
referring to fig. 4, on the basis of the first embodiment, the present embodiment is optimized as follows:
and a heat storage device 11 is further arranged between the heat exchange tube assembly 4 and the heat insulation cotton 5, and the heat storage device 11 is used for storing excessive radiation heat.
It can be understood that heat storage device 11 can be good under the solar irradiation condition, and under the strong circumstances of light, store the abundant radiant heat of heat exchange tube subassembly 4 or heat exchange coil 7, and under the less strong circumstances of solar irradiance, heat storage device 11 releases the gained heat of this storage again to heat the heat transfer medium in heat exchange tube subassembly 4 or the heat exchange coil 7, reduce the thermal inertia of cavity heat absorber, and then promote the work efficiency of cavity heat absorber.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (7)
1. The utility model provides a range upon range of formula solar energy cavity heat absorber, includes the cavity shell, the cavity shell is lower uncovered formula casing, its characterized in that:
a first medium shunt pipe and a second medium shunt pipe are arranged in the cavity shell; a plurality of annular heat exchange tube components which are arranged in a stacked mode are communicated between the first medium shunt tube and the second medium shunt tube; heat insulation cotton is filled between the cavity shell and the heat exchange tube assembly;
the second medium flow dividing pipe is provided with a plurality of flow control devices which correspond to the heat exchange pipe components one by one; the flow control device controls the flow of the heat exchange tube assembly independently;
the top surface of the heat exchange tube component positioned on the top layer is also provided with a heat exchange coil, and the two opposite sides of the heat exchange coil are respectively communicated with the first medium shunt tube and the second medium shunt tube.
2. The cavity heat absorber of claim 1, wherein the heat exchange tube assembly comprises two semicircular heat absorbing tubes and two tee pipes, and the two heat absorbing tubes are connected into a circular ring shape through the two tee pipes; the heat exchange tube assembly is communicated with the first medium shunt tube and the second medium shunt tube through the three-way tube;
the flow control device comprises a control element, a temperature measurement module for detecting the temperature of the heat exchange medium and an electromagnetic valve for regulating and controlling the flow; the control element is respectively and electrically connected with the temperature measuring module and the electromagnetic valve.
3. The cavity heat absorber of claim 1, wherein the heat insulating cotton is attached with a reflecting device at a gap between the two heat exchange tube assemblies; the reflecting device is used for reflecting sunlight passing through the gap of the heat exchange tube assembly to the heat exchange tube assembly again;
the reflecting device can be a reflector or a plate coated with a reflecting coating on the surface or a plate stuck with a reflecting film on the surface.
4. The cavity heat absorber of claim 1, wherein a heat storage device is further disposed between the heat exchange tube assembly and the heat insulation cotton, and the heat storage device is configured to store excess radiant heat.
5. The cavity heat absorber of claim 1, wherein the thermal insulation wool is slag wool or rock wool.
6. The cavity heat absorber of claim 1, wherein the heat exchange tube assembly and the heat exchange coil are coated on the outer surface with a heat absorbing coating.
7. The cavity heat sink of claim 6, wherein the heat sink coating is a black chrome coating or a black nickel coating.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811033794.6A CN109140791B (en) | 2018-09-05 | 2018-09-05 | Stacked solar cavity heat absorber |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811033794.6A CN109140791B (en) | 2018-09-05 | 2018-09-05 | Stacked solar cavity heat absorber |
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| CN109140791A CN109140791A (en) | 2019-01-04 |
| CN109140791B true CN109140791B (en) | 2020-02-07 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201811033794.6A Active CN109140791B (en) | 2018-09-05 | 2018-09-05 | Stacked solar cavity heat absorber |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102353156A (en) * | 2011-08-15 | 2012-02-15 | 哈尔滨工业大学 | Cylindrical-cavity type solar heat absorber with internally-convex bottom surface |
| JP2012117716A (en) * | 2010-11-30 | 2012-06-21 | Jfe Engineering Corp | Solar power generation system |
| CN205179959U (en) * | 2015-10-24 | 2016-04-27 | 重庆市永川区德茂农业开发有限公司 | Automatic irrigation equipment of jujube tree woodland |
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2018
- 2018-09-05 CN CN201811033794.6A patent/CN109140791B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012117716A (en) * | 2010-11-30 | 2012-06-21 | Jfe Engineering Corp | Solar power generation system |
| CN102353156A (en) * | 2011-08-15 | 2012-02-15 | 哈尔滨工业大学 | Cylindrical-cavity type solar heat absorber with internally-convex bottom surface |
| CN205179959U (en) * | 2015-10-24 | 2016-04-27 | 重庆市永川区德茂农业开发有限公司 | Automatic irrigation equipment of jujube tree woodland |
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| CN109140791A (en) | 2019-01-04 |
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