CN111947333A - Secondary condenser for linear Fresnel type light-condensing heat collector - Google Patents
Secondary condenser for linear Fresnel type light-condensing heat collector Download PDFInfo
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- CN111947333A CN111947333A CN202010855248.1A CN202010855248A CN111947333A CN 111947333 A CN111947333 A CN 111947333A CN 202010855248 A CN202010855248 A CN 202010855248A CN 111947333 A CN111947333 A CN 111947333A
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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
- F24S23/00—Arrangements for concentrating solar-rays for solar heat collectors
- F24S23/30—Arrangements for concentrating solar-rays for solar heat collectors with lenses
- F24S23/31—Arrangements for concentrating solar-rays for solar heat collectors with lenses having discontinuous faces, e.g. Fresnel lenses
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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
- F24S10/70—Solar heat collectors using working fluids the working fluids being conveyed through tubular absorbing conduits
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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
- F24S70/10—Details of absorbing elements characterised by the absorbing 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
- F24S70/60—Details of absorbing elements characterised by the structure or construction
- F24S70/65—Combinations of two or more absorbing elements
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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
- F24S2023/83—Other shapes
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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 relates to a secondary condenser for a linear Fresnel type light-gathering heat collector, which consists of a secondary reflector, a heat absorption tube, a glass cover plate and a heat insulation layer, wherein the outer surface of the heat absorption tube is provided with TiAlN/TiAlON/Si3N4The solar energy spectrum selective absorption film metal material pipe has glass cover plate of low iron or high borosilicate glass with spectrum selective reflecting film on the surface, and the spectrum selective reflecting film is formed by that the outer surface of low iron or high borosilicate glass is a layer of SiO2The inner surface is sequentially Al2O3Layer, aluminum-doped zinc oxide AZO layer, SiO2Layer ofMiddle Al2O3The layer is a buffer layer, the aluminum-doped zinc oxide AZO layer is an infrared reflecting layer, and the inner layer and the outer layer are SiO2The layer is an anti-reflection film layer; or the inner surface is sequentially Al2O3Layer, ITO layer, SiO2Layer of Al2O3The layer is a buffer layer, the ITO layer is an infrared reflecting layer, and the inner layer and the outer layer are SiO2The layer is an anti-reflection film layer; or the inner surface is sequentially Al2O3Layer, CN layer, SiO2And (3) a layer. The advantages are that: the gap loss is eliminated, and the optical efficiency is high. The heat loss is reduced, cleaning and dust removal are avoided, and the maintenance is convenient.
Description
Technical Field
The invention belongs to the technical field of solar photo-thermal, and particularly relates to a secondary light condensation device for a linear Fresnel type light condensation heat collector.
Background
Solar photo-thermal power generation is classified into a trough type, a tower type, a linear fresnel type, a disc type and the like according to a light-gathering form. The groove type and tower type solar thermal power generation technologies are the most mature, and compared with the groove type and tower type solar thermal power generation technologies, the linear Fresnel light-heat conversion efficiency is lower, but the linear Fresnel light-gathering technology has the advantages of simple structure, installation of the primary reflector close to the ground, low wind load, strong wind resistance, compact arrangement of the primary reflector, high land utilization efficiency and the like, has attracted wide attention in recent years, and is known as the most potential light-heat power generation technology in the future. A Linear Fresnel reflection solar system (LFR) is mainly composed of a primary mirror field, a secondary parabolic mirror, a heat absorber, a tracking driving device, and the like, as shown in fig. 1. In order to obtain higher system concentration ratio and overall system efficiency, the secondary condenser mostly adopts a structure of a single evacuated collector tube (consisting of a heat absorption tube and a glass tube) and a secondary reflector, sunlight is reflected by the primary reflector, a part of sunlight is directly projected onto the heat absorption tube, and the rest of sunlight is reflected by the secondary reflector and projected onto the heat absorption tube. Compound Parabolic Concentrators (CPCs) are the most common receivers used in LFR systems, as shown in fig. 2.
The problems existing at present are as follows: the secondary condenser of the traditional linear Fresnel type light-gathering and heat-collecting system mostly adopts a structure of a vacuum heat-collecting tube and a secondary reflector. The secondary condenser has gap loss (the convergence rate is about 85 percent), large convective heat loss, uneven distribution of energy flow on the surface of the heat absorber, high cost and inconvenient operation and maintenance.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a secondary condenser device which is used for a linear Fresnel type light-gathering and heat-collecting system.
The technical scheme of the invention is as follows: a secondary condenser for a linear Fresnel type condensation heat collector comprises a secondary reflector, a heat absorption pipe, a glass cover plate and a heat insulation layer, wherein the heat absorption pipe is a metal pipe of which the outer surface is provided with a solar spectrum selective absorption film, the glass cover plate is made of low-iron or high-borosilicate glass, the surface is provided with a spectrum selective reflection film, and the spectrum selective reflection film is formed by arranging a layer of SiO on the outer surface of the low-iron or high-borosilicate glass2The inner surface is sequentially Al2O3Layer, aluminum-doped zinc oxide AZO layer, SiO2Layer of Al2O3The layer is a buffer layer, the aluminum-doped zinc oxide AZO layer is an infrared reflecting layer, and the inner layer and the outer layer are SiO2The layer is an anti-reflection film layer; or the inner surface is sequentially Al2O3Layer, ITO layer, SiO2Layer of Al2O3The layer is a buffer layer, the ITO layer is an infrared reflecting layer, and the inner layer and the outer layer are SiO2The layer is an anti-reflection film layer; or the inner surface is sequentially Al2O3Layer, CN layer, SiO2Layer of Al2O3The layer is a buffer layer, the CN layer is an infrared reflecting layer, and the inner layer and the outer layer are SiO2The layer is an anti-reflection film layer.
The optical line type of the secondary reflector is one of a tracking-free condenser composite parabolic condenser, a secondary condenser adopting a self-adaptive method and a sectional parabolic condenser, and the mirror surface is a glass mirror with silvered back or an aluminum metal mirror with silvered surface.
Further, the method comprises the following steps: the heat absorption pipe is fixedly arranged at the focal line of the secondary reflector and is arranged without a gap with the secondary reflector.
It is preferable that: the heat-insulating layer is one of aluminum silicate, glass wool and rock wool.
Further, the method comprises the following steps: the secondary reflector and the glass cover plate form a closed cavity, and the inside of the cavity is air or vacuum.
The solar energy spectrum selective absorption film on the outer surface of the heat absorption tube is TiAlN/TiAlON/Si3N4And (3) a membrane.
The invention has the beneficial effects that: the stainless steel metal tube with the surface plated with the solar spectrum selective absorption film is used for replacing the vacuum heat collecting tube, the cost of using the vacuum heat collecting tube is greatly reduced, and TiAlN/TiAlON/Si is plated at the same time3N4The metal tube of the selective absorption film is in gapless connection with the secondary reflector, so that the gap loss is eliminated, and the optical efficiency of the secondary condenser is close to 100% theoretically. The glass cover plate is made of low-iron or high-borosilicate glass and is plated with a spectrum selective reflecting film, and the film layer has high transmittance (transmittance T is more than or equal to 90%) in the solar visible light range (380 nm-780 nm) and high reflectivity (corresponding to low radiance less than or equal to 0.10) in the infrared spectrum range; glass apron, secondary reflection, metal heat-absorbing pipe constitute an inclosed cavity, have reduced the heat radiation loss of secondary spotlight ware, make the cavity inside keep clean simultaneously, exempt from to clean the dust removal throughout the year, have brought very big convenience for the later stage operation maintenance of system. The whole condenser has simple structure, low price and convenient installation and maintenance.
Drawings
FIG. 1 is a schematic view of a linear Fresnel focusing system;
FIG. 2 is a schematic view of a vacuum heat collecting tube and a CPC structure;
FIG. 3 is a schematic cross-sectional view of a secondary concentrator of the present invention;
FIG. 4 is a schematic diagram of the transmission and reflection of light by the spectrally selective reflective film of the glass cover plate according to the present invention;
FIG. 5 is a schematic view of a secondary condenser of example 1;
1. secondary reflector, 2 heat absorption tube, 3 maximum acceptance half angle, 4 glass cover plate, 5 inner surface SiO2，6、AZO，7、Al2O38, substrate, 9, SiO outer surface 210, an insulating layer, 2-1, visible light, 2-2 and infrared light.
Detailed Description
Example 1
Referring to fig. 5, the secondary mirror 1 is a CPC. The maximum acceptance half angle 3 of the secondary parabolic mirror is 45 °. The width of the opening is 450 mm. Secondary reflector 1 adoptsThe high borosilicate glass has mirror surface with silver plated back and film layer reflectivity higher than 93%. The heat absorption tube 2 is made of stainless steel, and the outer diameter is phi 70 mm. The surface of the heat absorption tube 2 is plated with TiAlN/TiAlON/Si3N4The solar spectrum selective absorption film can normally work at 160-580 ℃, the corresponding absorptivity alpha is more than or equal to 95% at 580 ℃, and the infrared emissivity is less than or equal to 15%. The heat absorption pipe 2 is arranged at the focal line of the secondary reflector 1 and is in seamless connection with the secondary reflector.
High borosilicate glass is selected as a substrate 8 of the glass cover plate, the T of the high borosilicate glass is more than or equal to 90 percent, and the thickness of the high borosilicate glass is 3.2 mm. Al with high visible light transmittance and infrared reflectance is plated on the high borosilicate glass substrate 8 in sequence2O3 →AZO →SiO2A film is formed by preparing a layer of SiO on the back of the substrate2The reflection film has high transmittance in the range of solar visible light, the transmittance T is more than or equal to 90%, the reflection film has high reflectance in the range of infrared spectrum, and the corresponding low radiance is less than or equal to 0.10. The glass cover plate 4 plated with the solar spectrum selective reflection film is arranged at the opening position of the secondary reflector, so that the whole condenser forms a closed cavity.
Example 2
The secondary reflector 1 is a CPC, the maximum acceptance half angle 3 of the secondary parabolic reflector is 45 °, and the opening width is 450 mm. The secondary reflector 1 adopts high borosilicate glass, the mirror surface is silver-plated on the back surface, and the reflectivity of the film layer is more than 93 percent. The outer diameter of the heat absorption pipe 2 is phi 70mm, the surface of the heat absorption pipe is plated with a solar spectrum selective absorption film, the solar spectrum selective absorption film can normally work at 160-580 ℃, the corresponding absorption rate alpha is more than or equal to 95% at 580 ℃, and the infrared emissivity is less than or equal to 15%. The metal heat absorption pipe 2 is arranged at the focal line of the secondary reflector 1 and is in seamless connection with the secondary reflector.
High borosilicate glass is selected as a substrate 8 of the glass cover plate, the T of the high borosilicate glass is more than or equal to 90 percent, and the thickness of the high borosilicate glass is 3.2 mm. Al with high visible light transmittance and infrared reflectance is plated on the high borosilicate glass substrate 8 in sequence2O3→CN→SiO2A film is formed by preparing a layer of SiO on the back of the substrate2An anti-reflection film for reflecting visible light in the sunHas high transmittance within the range, the transmittance T is more than or equal to 90 percent, has high reflectivity within the infrared spectrum range, and has corresponding low radiance less than or equal to 0.10. The glass cover plate 4 plated with the solar spectrum selective reflection film is arranged at the opening position of the secondary reflector, so that the whole condenser forms a closed cavity.
Example 3
The secondary reflector 1 is a CPC, the maximum acceptance half angle 3 of the secondary parabolic reflector is 45 °, and the opening width is 450 mm. The secondary reflector 1 adopts high borosilicate glass, the mirror surface is silver-plated on the back surface, and the reflectivity of the film layer is more than 93 percent. The outer diameter of the heat absorption pipe 2 is phi 70mm, the surface of the heat absorption pipe is plated with a solar spectrum selective absorption film, the solar spectrum selective absorption film can normally work at 160-580 ℃, the corresponding absorption rate alpha is more than or equal to 95% at 580 ℃, and the infrared emissivity is less than or equal to 15%. The metal heat absorption pipe 2 is arranged at the focal line of the secondary reflector 1 and is in seamless connection with the secondary reflector.
High borosilicate glass is selected as a substrate 8 of the glass cover plate, the T of the high borosilicate glass is more than or equal to 90 percent, and the thickness of the high borosilicate glass is 3.2 mm. Al with high visible light transmittance and infrared reflectance is plated on the high borosilicate glass substrate 8 in sequence2O3→ITO→SiO2A film is formed by preparing a layer of SiO on the back of the substrate2The anti-reflection film has high transmittance in the visible light range of the sun, the transmittance T is more than or equal to 90%, the anti-reflection film has high reflectance in the infrared spectrum range, and the corresponding low radiance is less than or equal to 0.10. The glass cover plate 4 plated with the solar spectrum selective reflection film is arranged at the opening position of the secondary reflector, so that the whole condenser forms a closed cavity.
Claims (9)
1. The utility model provides a secondary concentrator for linear fei nieer formula spotlight heat collector, comprises secondary reflector (1), heat-absorbing pipe (2), glass apron (4) and heat preservation (10), characterized by: the heat absorption pipe (2) is a metal pipe with a solar spectrum selective absorption film on the outer surface, the glass cover plate (4) is low-iron or high-borosilicate glass with a spectrum selective reflection film on the surface, and the spectrum selective reflection film is formed by arranging a layer of SiO on the outer surface of the low-iron or high-borosilicate glass2The inner surface is sequentially Al2O3Layer, aluminum-doped zinc oxide AZO layer, SiO2Layer of Al2O3The layer is a buffer layer, the aluminum-doped zinc oxide AZO layer is an infrared reflecting layer, and the inner layer and the outer layer are SiO2The layer is an anti-reflection film layer.
2. The utility model provides a secondary concentrator for linear fei nieer formula spotlight heat collector, comprises secondary reflector (1), heat-absorbing pipe (2), glass apron (4) and heat preservation (10), characterized by: the heat absorption pipe (2) is a metal pipe with a solar spectrum selective absorption film on the outer surface, the glass cover plate (4) is low-iron or high-borosilicate glass with a spectrum selective reflection film on the surface, and the spectrum selective reflection film is formed by arranging a layer of SiO on the outer surface of the low-iron or high-borosilicate glass2The inner surface is sequentially Al2O3Layer, ITO layer, SiO2Layer of Al2O3The layer is a buffer layer, the ITO layer is an infrared reflecting layer, and the inner layer and the outer layer are SiO2The layer is an anti-reflection film layer.
3. The utility model provides a secondary concentrator for linear fei nieer formula spotlight heat collector, comprises secondary reflector (1), heat-absorbing pipe (2), glass apron (4) and heat preservation (10), characterized by: the heat absorption pipe (2) is a metal pipe with a solar spectrum selective absorption film on the outer surface, the glass cover plate (4) is low-iron or high-borosilicate glass with a spectrum selective reflection film on the surface, and the spectrum selective reflection film is formed by arranging a layer of SiO on the outer surface of the low-iron or high-borosilicate glass2The inner surface is sequentially Al2O3Layer, CN layer, SiO2Layer of Al2O3The layer is a buffer layer, the CN layer is an infrared reflecting layer, and the inner layer and the outer layer are SiO2The layer is an anti-reflection film layer.
4. The secondary condenser for a linear fresnel type concentrating collector according to claim 1, 2 or 3, wherein: the optical line type of the secondary reflector (1) is one of a tracking-free condenser composite parabolic condenser, a secondary condenser adopting a self-adaptive method and a sectional parabolic condenser, and the mirror surface is a glass mirror with silver plated on the back surface or an aluminum metal mirror with silver plated on the surface.
5. The secondary condenser for a linear fresnel type concentrating collector according to claim 1, 2 or 3, wherein: the heat absorption pipe (2) is fixedly arranged at the focal line of the secondary reflector (1) and is arranged without a gap between the heat absorption pipe and the secondary reflector (1).
6. The secondary condenser for a linear fresnel type concentrating collector according to claim 1, 2 or 3, wherein: the heat-insulating layer (10) is one of aluminum silicate, glass wool and rock wool.
7. The secondary condenser for a linear fresnel type concentrating collector according to claim 1, 2 or 3, wherein: the secondary reflector (1) and the glass cover plate (4) form a closed cavity, and the inside of the cavity is air or vacuum.
8. The secondary condenser for a linear fresnel type concentrating collector according to claim 1, 2 or 3, wherein: the heat absorption pipe (2) is made of a stainless steel pipe.
9. The secondary condenser for a linear fresnel type concentrating collector according to claim 1, 2 or 3, wherein: the solar energy spectrum selective absorption film on the outer surface of the heat absorption tube (2) is TiAlN/TiAlON/Si3N4And (3) a membrane.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010855248.1A CN111947333A (en) | 2020-08-24 | 2020-08-24 | Secondary condenser for linear Fresnel type light-condensing heat collector |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010855248.1A CN111947333A (en) | 2020-08-24 | 2020-08-24 | Secondary condenser for linear Fresnel type light-condensing heat collector |
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| CN111947333A true CN111947333A (en) | 2020-11-17 |
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| CN202010855248.1A Pending CN111947333A (en) | 2020-08-24 | 2020-08-24 | Secondary condenser for linear Fresnel type light-condensing heat collector |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114739134A (en) * | 2022-04-11 | 2022-07-12 | 华东交通大学 | Medicinal material drying coupling energy supply system based on solar spectrum frequency division |
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| CN103383150A (en) * | 2013-07-08 | 2013-11-06 | 西安交通大学 | Linear Fresnel reflection type mid-and-low temperature solar energy thermochemical utilization device |
| CN104913522A (en) * | 2015-05-19 | 2015-09-16 | 张曹 | Fresnel type solar heat receiver |
| CN104990286A (en) * | 2015-06-25 | 2015-10-21 | 上海理工大学 | Composite paraboloid solar collector |
| CN106152576A (en) * | 2016-09-14 | 2016-11-23 | 兰州交通大学 | High temperature spectrum coating for selective absorption based on refractory metal boride and preparation method |
-
2020
- 2020-08-24 CN CN202010855248.1A patent/CN111947333A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102555355A (en) * | 2011-12-29 | 2012-07-11 | 中国华能集团清洁能源技术研究院有限公司 | Ultra-white glass baffle |
| CN102734961A (en) * | 2012-06-26 | 2012-10-17 | 四川中科百博太阳能科技有限公司 | Solar medium-temperature and high-temperature selective absorption coating layer |
| CN103383150A (en) * | 2013-07-08 | 2013-11-06 | 西安交通大学 | Linear Fresnel reflection type mid-and-low temperature solar energy thermochemical utilization device |
| CN104913522A (en) * | 2015-05-19 | 2015-09-16 | 张曹 | Fresnel type solar heat receiver |
| CN104990286A (en) * | 2015-06-25 | 2015-10-21 | 上海理工大学 | Composite paraboloid solar collector |
| CN106152576A (en) * | 2016-09-14 | 2016-11-23 | 兰州交通大学 | High temperature spectrum coating for selective absorption based on refractory metal boride and preparation method |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114739134A (en) * | 2022-04-11 | 2022-07-12 | 华东交通大学 | Medicinal material drying coupling energy supply system based on solar spectrum frequency division |
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