CN110195938B - Magnetic field-assisted nano-fluid direct absorption type concentrating magnetic fluid solar heat collector - Google Patents
Magnetic field-assisted nano-fluid direct absorption type concentrating magnetic fluid solar heat collector Download PDFInfo
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- CN110195938B CN110195938B CN201910520344.8A CN201910520344A CN110195938B CN 110195938 B CN110195938 B CN 110195938B CN 201910520344 A CN201910520344 A CN 201910520344A CN 110195938 B CN110195938 B CN 110195938B
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- 239000012530 fluid Substances 0.000 title claims abstract description 37
- 239000011553 magnetic fluid Substances 0.000 title claims abstract description 37
- 239000011521 glass Substances 0.000 claims abstract description 125
- 239000002184 metal Substances 0.000 claims description 43
- 238000002955 isolation Methods 0.000 claims description 35
- 238000007789 sealing Methods 0.000 claims description 28
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Classifications
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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
- F24S10/40—Solar heat collectors using working fluids in absorbing elements surrounded by transparent enclosures, e.g. evacuated solar collectors
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
- F24S23/00—Arrangements for concentrating solar-rays for solar heat collectors
- F24S23/70—Arrangements for concentrating solar-rays for solar heat collectors with reflectors
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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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
- F24S80/00—Details, accessories or component parts of solar heat collectors not provided for in groups F24S10/00-F24S70/00
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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
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B10/00—Integration of renewable energy sources in buildings
- Y02B10/20—Solar thermal
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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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- 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
- Y02E10/47—Mountings or tracking
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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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P80/00—Climate change mitigation technologies for sector-wide applications
- Y02P80/20—Climate change mitigation technologies for sector-wide applications using renewable energy
Abstract
The invention discloses a magnetic field assisted nano-fluid direct absorption type concentrating magnetic fluid solar heat collection device which comprises a solar positioning tracking reflection device, a solar absorption device and a heat exchange steam generation device. The solar heat collector has the advantages that the photo-thermal absorption heat transfer efficiency is effectively improved through the nano fluid, meanwhile, the nano magnetic fluid hillock structure is formed in the nano fluid by utilizing an external magnetic field to supplement and absorb solar energy, and steam in a middle-temperature area and a low-temperature area is generated by utilizing solar heat energy, so that the solar heat collector has a larger radiation absorption area, and the glass vacuum tube wall temperature is lower than that of the heat carrier fluid, so that the solar heat collector is not easy to crack. The device has simple manufacture and lower cost, does not have the problems of film forging technology of selective absorption coating, oxidation and falling off of the coating after long-term use, and can be suitable for different scenes such as families, factories and the like.
Description
Technical Field
The invention belongs to the field of solar heat utilization and steam generation, and particularly relates to a magnetic field assisted nano fluid direct absorption type concentrating magnetic fluid solar heat collection device.
Background
Solar energy is one of the most abundant of all renewable energy sources, and the annual solar radiation energy received by the earth's surface is about 340000EJ, one of the most important energy sources in the 21 st century. Solar heat utilization is divided into three fields according to working temperature: the temperature below 80 ℃ is in the low temperature field, the temperature between 80 ℃ and 250 ℃ is in the medium temperature field, and the temperature between 250 ℃ and 800 ℃ is in the high temperature field. At present, the conventional medium-temperature heat collection mode is indirect heat absorption and collection, and mainly relies on a selective absorption coating on a vacuum coating tube to absorb solar radiation to heat an internal working medium, and heat is transferred to fluid in the tube in a heat conduction and convection mode. The highest temperature point of the solar energy absorbing device appears on the outer wall of the glass tube after absorbing sunlight, so the glass tube is easy to crack due to temperature difference. Therefore, the vacuum coating tube has two key technical problems: the difficulty of the glass and metal sealing technology is high; the heat resistance and vacuum degree of the selective absorption coating are difficult to maintain for a long time. Leading to poor system stability, reliability and durability, which are major obstacles to their use. In addition, the vacuum coating tube has complex manufacturing process and higher cost.
The heat transfer mechanism of the nano fluid direct absorption solar heat collector is that the phenomena of absorption, scattering, transmission and the like can occur when radiant rays are irradiated onto single nano particles. The nano-particles absorb radiation and heat up, then transfer heat to an electric double layer wrapping the particles in a heat conduction mode, and then transfer heat to external liquid in a convection mode. While the transmitted and scattered radiation is blocked by other particles and is reabsorbed by them. Repeated absorption of radiation is responsible for the macroscopic manifestation of high absorption and extinction coefficients of nanofluids. The nano fluid direct absorption solar heat collector utilizes nano fluid heat collecting medium in a transparent container to directly absorb solar radiation, and the heat collecting medium is a heat absorbing material and a heat transfer and heat carrying material. The advantages of the nanofluid direct absorption collector are as follows: (1) The heat-carrying medium is used as a radiation absorbing medium at the same time, solar radiation in the direct absorption collector is directly absorbed by nano particles dispersed in fluid in the heat-collecting tube layer by layer, compared with the traditional heat-collecting tube adopting an absorption coating, the heat-absorbing area is arranged in the container instead of the tube wall, so that the heat-collecting tube has larger radiation-absorbing area, the wall temperature of the heat-collecting tube is lower than that of the heat-carrying fluid, and the glass tube is not easy to crack; (2) The direct absorption collector does not need to use an absorption coating, is simple to manufacture and low in cost, and does not have the problems of film forging technology of the selective absorption coating, oxidation, falling-off and the like of the coating after long-term use; (3) The direct absorption and collection heater can be optimized in terms of the properties, shape, particle size, concentration and the like of the nano particles, so that the direct absorption and collection heater is suitable for different scenes.
Although the nano fluid directly absorbs the solar heat collector can effectively improve the absorption of solar light and heat, and can also improve the absorption efficiency of solar light and heat by changing the types, the sizes, the shapes and the like of nano particles, the natural world has difficulty in finding a substance which is completely matched with the solar visible light wave band and has high absorption. Nano magnetic fluid is a special nano fluid, which has the magnetism of solid matters and the flow characteristic of liquid. When an external magnetic field acts, the magnetic nano-particle magnetic head can be controlled, positioned, oriented and moved, and also has the function of enhancing heat transfer, and meanwhile, the distribution structural characteristics of the magnetic nano-particles can be changed, so that the optical properties of the nano-magnetic fluid can be changed. When an external magnetic field exists, the nanometer magnetic fluid forms regular and orderly protrusions in a space arrangement shape like hills under the action of the magnetic field, and the hills formed by the nanometer magnetic fluid can enable light to be reflected, scattered and absorbed for multiple times in the space formed by each peak to form a special structure for capturing light beams. The magnetic field arrangement mode and the magnetic field intensity can be controlled to change the distribution of magnetic force lines and the size of a hilly structure, so that the spatial arrangement structure of the magnetic powder is changed to match the wavelength of sunlight, and the absorption rate of the sunlight is improved.
Disclosure of Invention
The invention aims to solve the technical problems of improving the medium-temperature solar heat collection efficiency and the solar heat transfer efficiency, solving the problems of high temperature resistance and poor durability of an absorption coating of the traditional solar heat collector, increased reversible loss caused by large heat transfer temperature difference, easy cracking of the heat collection tube caused by large temperature difference around the heat collection tube under a condensation working condition, and the like. The invention provides a magnetic field assisted nano fluid direct absorption type concentrating magnetic fluid solar heat collector which can effectively improve photo-thermal absorption and heat transfer efficiency through nano fluid, and meanwhile, a nano magnetic fluid hilly structure is formed in the nano fluid by utilizing an externally applied magnetic field to supplement and absorb solar energy, and steam in a middle-temperature region and a low-temperature region is generated by utilizing solar heat energy.
The invention solves the technical problems by the following technical proposal:
a magnetic field assisted nano-fluid direct absorption type concentrating magnetic fluid solar heat collection device comprises a solar positioning tracking reflection device, a solar absorption device and a heat exchange steam generation device;
the solar positioning tracking reflection device comprises a condenser (2), a triangular bracket (15), a permanent magnet (3) and a single-axis light tracker (6), wherein the condenser (2) is in a semi-arc shape, one end of the condenser (2) is erected on the triangular bracket (15), the other end of the condenser (2) is inclined upwards, the permanent magnet (3) is arranged on the inner concave surface of the condenser (2), the single-axis light tracker (6) is connected to the side end of the condenser (2), and the single-axis light tracker (6) is communicated with a power supply;
the solar energy absorbing device comprises a glass vacuum outer tube I (4), a glass vacuum inner tube I (5), a glass isolation tube (13) and a metal sealing piece I (9), wherein the glass vacuum inner tube I (5) is nested outside the glass isolation tube (13), the glass vacuum outer tube I (4) is nested outside the glass vacuum inner tube I (5), the pipe orifices of the glass vacuum outer tube I (4) and the glass vacuum inner tube I (5) are all flush, the pipe orifices of the glass vacuum outer tube I (4) and the glass vacuum inner tube I (5) are sealed through the metal sealing piece I (9), the glass isolation tube (13) extends out of the metal sealing piece I (9), the glass vacuum outer tube I (4) is erected on the condenser (2), the pipe orifice of the glass vacuum outer tube I (4) is inclined upwards, and the glass vacuum outer tube I (4) is positioned at the condensing position on the condenser (2); the glass isolation tube (13) is filled with water (10), and a nano fluid absorption working medium (11) and a nano magnetic fluid absorption working medium (12) are filled between the glass vacuum inner tube I (5) and the glass isolation tube (13);
the heat exchange steam generating device comprises a glass vacuum outer tube II (7) and a metal sealing piece II (16), the glass vacuum outer tube II (7) is sleeved outside a glass isolation tube (13) extending out of the metal sealing piece I (9), the central shaft of the glass vacuum outer tube II (7) and the central shaft of the glass isolation tube (13) are in the same straight line, the other end of the glass vacuum outer tube II (7) is sealed by the metal sealing piece II (16), the end part of the glass isolation tube (13) extending out of the metal sealing piece I (9) is also sealed by the metal sealing piece II (16), and the glass vacuum outer tube II (7) is also provided with a water inlet (1) and a water outlet (8).
Further, the condenser (2) is connected to the middle part of the tripod (15), an arc-shaped sliding rail is arranged in the middle of the tripod (15), the arc-shaped sliding rails are symmetrical to each other about the lowest point, and pulleys are arranged at the joint of the condenser (2) and the arc-shaped sliding rails;
when the condenser (2) is positioned at the lowest point of the arc-shaped sliding rail, the condenser (2) forms an angle of 30 degrees with the horizontal plane, and when the condenser (2) is positioned at any high point on one side of the arc-shaped sliding rail, the condenser (2) forms an angle of 60 degrees with the horizontal plane.
Furthermore, the permanent magnets (3) are divided into two rows which are uniformly arranged on the condenser (2), the two rows of permanent magnets (3) and the axis of the condenser (2) are symmetrically distributed on two sides of the surface of the condenser (2) at an angle of 60 ℃, and each row of permanent magnets (3) is arranged on each row.
Furthermore, the nano magnetic fluid absorbing working medium (12) is positioned at two sides of the bottom of the first glass vacuum inner tube (5).
Further, the first glass vacuum outer tube (4) and the first glass vacuum inner tube (5) are arranged in vacuum, and the second glass vacuum outer tube (7) and the glass isolation tube (13) are arranged in vacuum.
Further, metal supporting pieces (14) are further arranged on two sides of the inner portion of the glass vacuum inner tube I (5), each side comprises two metal supporting pieces (14), the two metal supporting pieces (14) are symmetrically arranged on any side of the glass vacuum inner tube I (5), and the glass isolation tube (13) is clamped in the metal supporting pieces (14).
The beneficial effects of the invention are as follows:
compared with the prior art, the magnetic field assisted nano fluid direct absorption type concentrated magnetic fluid solar heat collector provided by the invention can effectively improve the photo-thermal absorption heat transfer efficiency through nano fluid, and meanwhile, the externally applied magnetic field is utilized to form a nano magnetic fluid hillock structure in the nano fluid to supplement and absorb solar energy, and solar heat energy is utilized to generate steam in a middle temperature area and a low temperature area, so that the solar heat collector has a larger absorption radiation area, and the glass vacuum tube wall temperature is lower than that of a heat carrier fluid, so that the solar heat collector is not easy to crack. The device has simple manufacture and lower cost, does not have the problems of film forging technology of selective absorption coating, oxidation and falling off of the coating after long-term use, and can be suitable for different scenes such as families, factories and the like.
Drawings
FIG. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is a schematic view of the solar energy absorber and heat exchange steam generator according to the present invention;
FIG. 3 is a schematic view of a concentrator reflecting sunlight in accordance with the present invention;
FIG. 4 is a schematic diagram of the structure of the nano magnetic fluid absorbing working medium absorbing sunlight in the invention;
FIG. 5 is a schematic diagram of the swing of the concentrator of the present invention;
FIG. 6 is a schematic diagram showing the positional relationship between the condenser and the permanent magnet in the present invention.
Reference numerals illustrate:
1-water inlet, 2-condenser, 3-permanent magnet, 4-glass vacuum outer tube I, 5-glass vacuum inner tube I, 6-single axis light tracker, 7-glass vacuum outer tube II, 8-water outlet, 9-metal sealing element I, 10-water, 11-nanometer fluid absorbing working medium, 12-nanometer magnetic fluid absorbing working medium 1, 13-glass isolation tube, 14-metal supporting element, 15-triangular bracket and 16-metal sealing element II.
Detailed Description
The invention is further illustrated by the following examples, which are intended to be illustrative only and not limiting in any way.
As shown in fig. 1, a magnetic field assisted nanofluid direct absorption type concentrating magnetic fluid solar heat collection device comprises a solar positioning tracking reflection device, a solar absorption device and a heat exchange steam generation device;
the solar positioning tracking reflection device comprises a condenser 2, an A-frame 15, a permanent magnet 3 and a single-axis light tracker 6. The condenser 2 is a semi-arc, in particular a U-shaped arc metal product, and a layer of substance film with high reflectivity is plated on the surface, so that when solar rays irradiate on the surface, solar rays in all directions which cannot be directly irradiated on a pipe and are absorbed can be focused and reflected on a vacuum pipe to the greatest extent according to the Snell reflection law and absorbed, and meanwhile, some light which cannot be absorbed by nano fluid and penetrates the vacuum pipe can be reflected again by the condenser 2, so that the effect of secondary absorption is achieved, and the solar energy absorption efficiency is improved. One end of the condenser 2 is erected on the triangular bracket 15, and the other end of the condenser 2 is inclined upwards, and the inner concave surface of the condenser 2 is upwards. As shown in fig. 5, the condenser 2 is connected to the middle part of the tripod 15, the middle part of the tripod 15 is provided with an arc-shaped slide rail, the arc-shaped slide rail is symmetrical to each other about the lowest point, a pulley is installed at the joint of the condenser 2 and the arc-shaped slide rail, when the condenser 2 is positioned at the lowest point of the arc-shaped slide rail, the condenser 2 forms an angle of 30 ° with the horizontal plane, and when the condenser 2 is positioned at any side high point of the arc-shaped slide rail, the condenser 2 forms an angle of 60 ° with the horizontal plane. The sun ray is received at 30 degrees with the horizon line in the morning immediately after work, the angle is changed along with the change of the light ray in the day, and the final sun ray is received at 30 degrees with the horizon line in the opposite direction in the evening. As shown in fig. 6, the permanent magnets 3 are arranged on the inner concave surface of the condenser 2, and the permanent magnets 3 are divided into two rows and uniformly arranged on the condenser 2, each row has five permanent magnets 3, and the two rows of permanent magnets 3 and the axis of the condenser 2 are symmetrically distributed on two sides of the surface of the condenser 2 at an angle of 60 ℃. The magnetic field formed by the permanent magnet 3 can excite the nano magnetic fluid in the solar tube by the magnetic field, and the protrusions of the hillock structure are formed along the distribution direction of the magnetic field. The uniaxial light tracker 6 is connected to the side end of the condenser 2, and the uniaxial light tracker 6 is connected to a power supply through a wire for tracking the direction of light. The single-axis light tracker is sensitive to illumination intensity, and can change its own receiving surface according to illumination intensity, namely, light direction. The single-axis light tracker 6 is connected with the condenser 2, and drives the condenser 2 to rotate simultaneously while rotating the tracking light, so that the condenser 2 always faces the sun to receive illumination with maximum intensity, and the solar energy absorption efficiency is improved.
As shown in fig. 2, the solar energy absorbing device comprises a glass vacuum outer tube 4, a glass vacuum inner tube 5, a glass isolation tube 13 and a metal sealing member 9, wherein the glass vacuum inner tube 5 is nested outside the glass isolation tube 13, two sides of the inside of the glass vacuum inner tube 5 are provided with metal supporting members 14, each side comprises two metal supporting members 14, the two metal supporting members 14 are symmetrically arranged on any side of the glass vacuum inner tube 5, the glass isolation tube 13 is clamped in the metal supporting members 14, the metal supporting members 14 play a fixing role on the glass isolation tube 13, and meanwhile, the problem of loss of the glass isolation tube 13 caused by thermal stress deformation can be relieved. The central axes of the glass vacuum outer tube 4, the glass vacuum inner tube 5 and the glass isolation tube 13 are on the same straight line. The first glass vacuum outer tube 4 is nested outside the first glass vacuum inner tube 5, and the first glass vacuum outer tube 4 and the first glass vacuum inner tube 5 are arranged in vacuum, so that heat can be effectively insulated, and heat loss is reduced. The pipe orifices of the glass vacuum outer pipe I4 and the glass vacuum inner pipe I5 are all flush, the pipe orifices of the glass vacuum outer pipe I4 and the glass vacuum inner pipe I5 are sealed through the metal sealing piece I9, the glass isolation pipe 13 extends out of the metal sealing piece I9, and the metal sealing piece I9 is tightly connected with the glass vacuum inner pipe I5 and the glass vacuum outer pipe I4. The first glass vacuum outer tube 4 is arranged on the condenser 2, the mouth of the first glass vacuum outer tube 4 is inclined upwards, the first glass vacuum outer tube 4 is parallel to the condenser 2, and the first glass vacuum outer tube 4 is positioned at the condensing position on the condenser 2; the glass isolation tube 13 is filled with water 10, the nano fluid absorbing working medium 11 and the nano magnetic fluid absorbing working medium 12 are filled between the glass vacuum inner tube 5 and the glass isolation tube 13, and the nano magnetic fluid absorbing working medium 12 is positioned at two sides of the bottom of the glass vacuum inner tube 5. The nano fluid absorbing working medium 11 is formed by adding nano particles with high absorptivity and high thermal conductivity into heat conducting oil or other base liquids, and can effectively improve the solar energy absorbing efficiency. Meanwhile, different nanoparticle materials have different sunlight absorption wave bands, and the added nanoparticle materials can be changed to be matched with sunlight wave bands absorbed by the nanoparticle materials, so that the sunlight absorption of different wave bands is increased or matched. The nano magnetic fluid absorption working medium 12 is positioned in the nano fluid absorption working medium 11, and has the characteristic of solid when an external magnetic field exists because the nano magnetic fluid absorption working medium 12 is characterized by liquid when no external magnetic field exists, and meanwhile, the nano magnetic fluid absorption working medium 12 also has good absorptivity and thermal conductivity. As shown in fig. 3 and 4, in the magnetic field excited by the lattice of permanent magnets 3 on the concentrator 2, the nano-magnetic fluid absorbing working medium 12 forms a fixed hill-like structure along the direction of the magnetic field, and solar rays are repeatedly absorbed and reflected when they are irradiated on the protruding structures until the sunlight is completely absorbed.
The heat exchange steam generating device comprises a second glass vacuum outer tube 7 and a second metal sealing piece 16, wherein the second glass vacuum outer tube 7 is sleeved outside a glass isolation tube 13 extending out of the first metal sealing piece 9, and the second glass vacuum outer tube 7 and the glass isolation tube 13 are arranged in a vacuum mode. The central axis of the glass vacuum outer tube II 7 and the central axis of the glass isolation tube 13 are on the same straight line, the other end of the glass vacuum outer tube II 7 is sealed by a metal sealing piece II 16, and the end part of the glass isolation tube 13 extending out of the metal sealing piece I9 is also sealed by the metal sealing piece II 16 to isolate and seal water in the glass isolation tube 13. The second glass vacuum outer tube 7 is also provided with a water inlet 1 and a water outlet 8, and cold water enters the tube and is discharged from the water outlet after heat exchange and temperature rise of the solar energy absorbing device.
The working flow of the invention is as follows:
when the device starts to work, sunlight firstly irradiates on the nano fluid absorbing working medium 11 through the transparent glass vacuum outer tube I4 and the glass vacuum inner tube I5, most sunlight is absorbed by the nano fluid working medium 11 and converted into heat energy, part of sunlight which is not absorbed by the nano fluid working medium 11 reaches the bottom nano magnetic fluid absorbing working medium 12, the sunlight is continuously reflected and absorbed again by the nano magnetic fluid working medium 12 in a hilly structure formed by the externally applied magnetic field of the dot matrix of the permanent magnet 3, and part of sunlight which is not directly irradiated on the nano fluid absorbing working medium 11 but irradiated on the condenser 2 is reflected by the condenser 2 and is focused on the nano fluid working medium 11 in the tube to be absorbed. The temperature of the nano fluid absorbing working medium 11 and the nano magnetic fluid working medium 12 can rise along with the sunlight absorption, heat is transferred to the water 10 in the U-shaped glass isolating tube 13 through heat transfer, the water temperature is increased, cold water continuously enters from the water inlet 1, and the heated hot water is discharged along with the water outlet 8 for daily household or industrial use. The irradiation angles of the sunlight in different time periods are different, and at this time, the single-axis light tracker 6 can adjust the angle of the condenser 2 according to the irradiation angle of the sunlight, so that the sunlight always faces the middle part of the condenser 2, and the strongest sunlight is received to the greatest extent. The solar energy absorbing device part in the device can also be sleeved and arranged on a large scale so as to meet the requirements of different application occasions.
The foregoing is merely a preferred embodiment of the present invention and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the present invention, which are intended to be comprehended within the scope of the present invention.
Claims (6)
1. A magnetic field assisted nano fluid direct absorption type concentrating magnetic fluid solar heat collection device is characterized in that: the solar energy positioning tracking reflection device, the solar energy absorption device and the heat exchange steam generation device are included;
the solar positioning tracking reflection device comprises a condenser (2), a triangular bracket (15), a permanent magnet (3) and a single-axis light tracker (6), wherein the condenser (2) is in a semi-arc shape, one end of the condenser (2) is erected on the triangular bracket (15), the other end of the condenser (2) is inclined upwards, the permanent magnet (3) is arranged on the inner concave surface of the condenser (2), the single-axis light tracker (6) is connected to the side end of the condenser (2), and the single-axis light tracker (6) is communicated with a power supply;
the solar energy absorbing device comprises a glass vacuum outer tube I (4), a glass vacuum inner tube I (5), a glass isolation tube (13) and a metal sealing piece I (9), wherein the glass vacuum inner tube I (5) is nested outside the glass isolation tube (13), the glass vacuum outer tube I (4) is nested outside the glass vacuum inner tube I (5), the pipe orifices of the glass vacuum outer tube I (4) and the glass vacuum inner tube I (5) are all flush, the pipe orifices of the glass vacuum outer tube I (4) and the glass vacuum inner tube I (5) are sealed through the metal sealing piece I (9), the glass isolation tube (13) extends out of the metal sealing piece I (9), the glass vacuum outer tube I (4) is erected on the condenser (2), the pipe orifice of the glass vacuum outer tube I (4) is inclined upwards, and the glass vacuum outer tube I (4) is positioned at the condensing position on the condenser (2); the glass isolation tube (13) is filled with water (10), and a nano fluid absorption working medium (11) and a nano magnetic fluid absorption working medium (12) are filled between the glass vacuum inner tube I (5) and the glass isolation tube (13);
the heat exchange steam generating device comprises a glass vacuum outer tube II (7) and a metal sealing piece II (16), the glass vacuum outer tube II (7) is sleeved outside a glass isolation tube (13) extending out of the metal sealing piece I (9), the central shaft of the glass vacuum outer tube II (7) and the central shaft of the glass isolation tube (13) are in the same straight line, the other end of the glass vacuum outer tube II (7) is sealed by the metal sealing piece II (16), the end part of the glass isolation tube (13) extending out of the metal sealing piece I (9) is also sealed by the metal sealing piece II (16), and the glass vacuum outer tube II (7) is also provided with a water inlet (1) and a water outlet (8).
2. The magnetic field assisted nanofluid direct absorption type concentrated magnetic fluid solar heat collection device as claimed in claim 1, wherein: the condenser (2) is connected to the middle part of the triangular bracket (15), an arc-shaped sliding rail is arranged in the middle of the triangular bracket (15), the arc-shaped sliding rails are mutually symmetrical about the lowest point, and pulleys are arranged at the joint of the condenser (2) and the arc-shaped sliding rails;
when the condenser (2) is positioned at the lowest point of the arc-shaped sliding rail, the condenser (2) forms an angle of 30 degrees with the horizontal plane, and when the condenser (2) is positioned at any high point on one side of the arc-shaped sliding rail, the condenser (2) forms an angle of 60 degrees with the horizontal plane.
3. The magnetic field assisted nanofluid direct absorption type concentrated magnetic fluid solar heat collection device as claimed in claim 2, wherein: the permanent magnets (3) are divided into two rows and uniformly arranged on the condenser (2), the two rows of permanent magnets (3) and the axis of the condenser (2) are symmetrically distributed on two sides of the surface of the condenser (2) at an angle of 60 ℃, and each row of permanent magnets (3) is arranged on each row.
4. The magnetic field assisted nanofluid direct absorption concentrating magnetic fluid solar heat collector as claimed in claim 3, wherein: the nanometer magnetic fluid absorbing working medium (12) is positioned at two sides of the bottom of the first glass vacuum inner tube (5).
5. The magnetic field assisted nanofluid direct absorption concentrating magnetic fluid solar heat collector according to claim 4, wherein: the first glass vacuum outer tube (4) and the first glass vacuum inner tube (5) are arranged in vacuum, and the second glass vacuum outer tube (7) and the glass isolation tube (13) are arranged in vacuum.
6. The magnetic field assisted nanofluid direct absorption concentrating magnetic fluid solar heat collector as defined in claim 5, wherein: the glass vacuum inner tube (5) is characterized in that metal supporting pieces (14) are further arranged on two sides of the inside of the glass vacuum inner tube (5), each side comprises two metal supporting pieces (14), the two metal supporting pieces (14) are symmetrically arranged on any side of the glass vacuum inner tube (5), and the glass isolation tube (13) is clamped in the metal supporting pieces (14).
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| JP2010144957A (en) * | 2008-12-16 | 2010-07-01 | Ihi Corp | Solar heat collection method and device |
| CN103075828A (en) * | 2013-01-31 | 2013-05-01 | 卢孟磊 | Silicon dioxide (SiO2) aerogel trough-type solar heat-collecting tube and preparation method thereof |
| CN104601103A (en) * | 2014-12-30 | 2015-05-06 | 河海大学常州校区 | Magnetic nano-fluid concentrating photovoltaic combined heat and power generation device |
| CN106839465A (en) * | 2017-01-23 | 2017-06-13 | 东南大学 | Nano-fluid direct absorption type solar steam raising plant and method |
| CN210602296U (en) * | 2019-06-17 | 2020-05-22 | 河海大学 | Magnetic field assisted nano-fluid direct absorption type concentrating magnetofluid solar heat collection device |
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| WO2010016934A2 (en) * | 2008-08-06 | 2010-02-11 | Sopogy, Inc. | Concentrated solar trough and mobile solar collector |
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| JP2010144957A (en) * | 2008-12-16 | 2010-07-01 | Ihi Corp | Solar heat collection method and device |
| CN103075828A (en) * | 2013-01-31 | 2013-05-01 | 卢孟磊 | Silicon dioxide (SiO2) aerogel trough-type solar heat-collecting tube and preparation method thereof |
| CN104601103A (en) * | 2014-12-30 | 2015-05-06 | 河海大学常州校区 | Magnetic nano-fluid concentrating photovoltaic combined heat and power generation device |
| CN106839465A (en) * | 2017-01-23 | 2017-06-13 | 东南大学 | Nano-fluid direct absorption type solar steam raising plant and method |
| CN210602296U (en) * | 2019-06-17 | 2020-05-22 | 河海大学 | Magnetic field assisted nano-fluid direct absorption type concentrating magnetofluid solar heat collection device |
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