CN104048429A - Medium-high temperature cavity heat collection tube in trough type heat collection system - Google Patents
Medium-high temperature cavity heat collection tube in trough type heat collection system Download PDFInfo
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- CN104048429A CN104048429A CN201410305338.8A CN201410305338A CN104048429A CN 104048429 A CN104048429 A CN 104048429A CN 201410305338 A CN201410305338 A CN 201410305338A CN 104048429 A CN104048429 A CN 104048429A
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- cavity
- tube
- high temperature
- circular glass
- heat collection
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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
Abstract
The invention discloses a medium-high temperature cavity heat collection tube in a trough type heat collection system. The medium-high temperature cavity heat collection tube comprises a round glass cavity, triangular reflection plates and a metal absorption tube. The outer surface of the round glass cavity is coated with a thermal insulation layer, a certain gap is reserved between the triangular plates and serves as a light incidence opening, the inner surface of the round glass cavity is plated with a reflection film, and the outer surface of the absorption tube is plated with a selective absorption coating. Sun light is reflected through a parabolic reflection surface, one part of the light directly irradiates in the round glass cavity, other light enters the cavity after being reflected by the triangular reflection plates, one part of the light which irradiates in the cavity directly irradiates the absorption tube, and the other part of the light is absorbed by the absorption tube after being reflected by the round glass cavity. Strict vacuum requirements of a traditional vacuum tube are met, and the medium-high temperature cavity heat collection tube has the advantages of being good in heat collection effect, simple in structure, low in requirement for a tracking system and the like, cost is lower than the cost of a traditional medium-high temperature heat collection tube, maintaining is convenient, service life is longer, and the medium-high temperature cavity heat collection tube has good market development prospects.
Description
Technical field
The present invention relates to a kind of solar energy heat collection pipe, specifically the middle high temperature cavity type thermal-collecting tube in a kind of slot type collecting system.
Background technology
Slot type focused solar energy thermal-collecting tube, as the one of middle high-temperature heat-collection pipe, can obtain higher heat-collecting temperature, can be used for production and the sphere of lifes such as generating, refrigeration air-conditioner, heating, desalinization.At present, although what tradition slot type solar energy heat collection pipe mainly adopted is that metal-glass structure high vacuum interlayer has greatly reduced heat loss, but the sealing-in that simultaneously exists metal and glass goes out the problem of leaking gas after long-term work, can effectively avoid the problems referred to above taking black chamber principle as basic cavity absorber and adopt, raising system reliability of operation, the difficulty and the cost that reduce research and produce.Wherein absorption tube is a metal tube, and its surface scribbles selective coating, is used for absorbing solar energy, the material of selective coating is mainly black chromium, black nickel etc., in order to reduce heat loss, concentric glass round tube of surface cover outside metal circular tube, vacuumizes in the middle of metal tube and glass tube.Its major advantage is: absorption tube and extraneous without convection losses, and selective coating, very high to the absorptivity of sunlight, the emissivity under operating temperature is very low.Its shortcoming is: complex process, cost is high, can not keep the stability of long-term vacuum enhancing and selective coating, under the working condition of long term high temperature, due to glass-to-metal seal coefficient of expansion difference, the situation that can cause metal and glass sealing place to leak air, is difficult to keep vacuum, has reduced the operating efficiency of whole groove type solar system and the stability of system.
Summary of the invention
The present invention, in order to address the above problem, proposes the middle high temperature cavity type thermal-collecting tube in a kind of slot type collecting system.
The technical solution adopted in the present invention is as follows:
For a middle high temperature cavity type thermal-collecting tube for slot type collecting system, comprise two reflectors, circular glass cavity and metal absorption tube, described metal absorption tube is positioned at circular glass cavity; Described two reflectors are placed in the outer surface of circular glass cavity, between the contact position of the outer surface of described two reflectors and circular glass cavity, leave light entrance port; Described two reflectors are arranged symmetrically with light entrance port, and its extended line intersection forms certain angle; The intersection point of the extended line of described two reflectors, the center of circle in circular glass chamber, the focus of the center of circle of metal absorption tube and optically focused parabolic lens is point-blank; Described circular glass chamber outer surface, is coated with one deck reflectance coating, the heat-insulation layer of described reflectance coating outer wrapping one deck beyond light entrance port.
Aforesaid reflectance coating is silver-colored reflectance coating.
The thickness of aforesaid heat-insulation layer is 10mm.
The outer wall of aforesaid metal absorption tube is 2～3mm apart from the beeline of circular glass cavity inner wall face.
In aforesaid metal absorption tube, heat absorption working medium is housed, described metal absorption tube outer surface is coated with selective coating.
The inner surface of aforesaid two reflectors is coated with reflective membrane.
The A/F of aforesaid light entrance port is determined in the following manner:
The equation of parabolic concentration mirror is: y
2=4fx,
The equation of circular glass cavity is: (x-f-D)
2+ y
2=R
2,
The equation of metal absorption tube is: (x-f-D-R+r+l)
2+ y
2=r
2,
The equation of upper side reflector is:
lower side reflector and upper side reflector equation be about x axial symmetry,
Wherein, x, y is reference axis, R is the internal diameter of circular glass cavity, r is the external diameter of metal absorption tube, and f is the focal length of parabolic concentration mirror, and D is the distance between the focus of parabolic concentration mirror and the center of circle of circular glass cavity, l is the beeline between outer wall and the circular glass cavity inner wall of metal absorption tube, and α is the angle of reflector and x between centers;
The A/F of described light entrance port is the width between the equation of two triangle reflection plates and the intersection point of the equation of circular glass cavity.
Angle between aforesaid two reflectors is greater than the angle that optically focused parabolic lens edge reflections light forms.
When optically focused parabolic lens focal length is 800mm, optically focused parabolic lens A/F is 1m, and when tracking accuracy is 0.2 ゜, the angle between described two reflectors is 80 ゜～100 ゜.
The invention has the advantages that:
(1) overcome the harsh requirement of traditional vacuum tube for vacuum, simple in structure, reduce in a large number manufacturing cost;
(2) need not consider the problem of metal sealing, greatly improve the stability of system;
(3) utilize the feature of blackbody chamber high-absorbility, absorptivity is high, and inside cavity metal absorption tube not necessarily will be smeared selective coating, has reduced technological requirement;
(4) die sinking of circular glass chamber is simple, and the size that only need to control heat-insulation layer just can be controlled the A/F of cavity, easy for installation, easy to maintenance, is conducive to mass production;
(5) by the principle of reflection of triangle reflection plate, can reduce the A/F of cavity, further improve the absorption efficiency of cavity.
Brief description of the drawings
Fig. 1 is groove type solar cavity type thermal-collecting tube cutaway view of the present invention;
Fig. 2 is based on groove type solar cavity type thermal-collecting tube ray trace schematic diagram under Tracepro;
Fig. 3 is the ray trace schematic diagram while being 0.2 ゜ based on tracking error under Tracepro;
Fig. 4 is each several part of the present invention position relationship schematic diagram spatially.
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.
Middle high temperature cavity type thermal-collecting tube for slot type collecting system of the present invention, section as shown in Figure 1, comprises metal absorption tube 1, circular glass cavity 2, reflectance coating 3, heat-insulation layer 4 and two reflectors 5.
Metal absorption tube 1 is positioned at circular glass cavity 2, and the position of metal absorption tube 1 is as far as possible near the internal face of circular glass cavity 2 but do not contact, and is used for receiving reflecting into the light in circular glass cavity 2 from reflector 5.The outer wall of getting metal absorption tube 1 in the present invention is 2～3mm apart from the beeline of circular glass cavity 2 internal faces.
Two reflectors 5 are placed in the outer surface of circular glass cavity 2, and leave gap between the contact position of the outer surface of two reflectors 5 and circular glass cavity 2, as light entrance port, two reflectors 5 are arranged symmetrically with light entrance port, meeting under the situation of many reception light of can trying one's best, light entrance port is as far as possible little, the extended line intersection shape of two reflectors 5 has a certain degree, and the intersection point of the extended line of two reflectors 5, the center of circle of circular glass cavity 2, the focus of the center of circle of metal absorption tube 1 and optically focused parabolic lens 6 point-blank.Optically focused parabolic lens refers to parallel sunshine is gathered to a certain hot spot.
The A/F of light entrance port is definite in the following manner, as shown in Figure 4,
The equation of parabolic concentration mirror is: y
2=4fx,
The equation of circular glass cavity is: (x-f-D)
2+ y
2=R
2,
The equation of metal absorption tube is: (x-f-D-R+r+l)
2+ y
2=r
2,
The equation of upper side reflector is:
lower side reflector and upper side reflector equation be about x axial symmetry,
Wherein, x, y is reference axis, R is the internal diameter of circular glass cavity, r is the external diameter of metal absorption tube, and f is the focal length of parabolic concentration mirror, and D is the distance between the focus of parabolic concentration mirror and the center of circle of circular glass cavity, l is the beeline between outer wall and the circular glass cavity inner wall of metal absorption tube, and α is the angle of reflector and x between centers;
Generally, get R ≈ 3r,
The A/F of light entrance port is the width between the equation of two triangle reflection plates and the intersection point of the equation of circular glass cavity.After the angle α of reflector and x between centers determines, the placement location of two reflectors can be determined.
In the present invention, get two angle 2 α between reflector 5 and be slightly larger than the angle that optically focused parabolic lens 6 edge reflections light form, light after optically focused parabolic lens can be entered between two reflectors and enter into again in circular glass cavity 2.For example, when optically focused parabolic lens focal length is 800mm, A/F is 1m, and when tracking accuracy is 0.2 ゜, angle 2 α between two reflectors can be set to 80 ゜～100 ゜.
At circular glass cavity 2 outer surfaces, except light entrance port, plating is with the reflectance coating 3 of high reflectance, then at the heat-insulation layer 4 of the about 10mm of reflectance coating 3 outer wrapping a layer thickness.In the present invention, reflectance coating adopts silver-colored reflectance coating.
Principle of the present invention is, sunray enters circular glass cavity 2 from light entrance port after being assembled by optically focused parabolic lens 6, part light is directly mapped to metal absorption tube 1, other light through the reflectance coating 3 on circular glass cavity 2 surfaces once or multiple reflections absorbed by the selective coating of metal absorption tube 1 outside wall surface again.
In metal absorption tube 1 of the present invention, heat absorption working medium is housed, outer surface is coated with selective coating, increases the absorptivity of metal absorption tube 1.
Due to the existence of tracking error, focus place at optically focused parabolic lens 6 there will be situation about defocusing, thereby causing light is not to assemble with the situation of focal line, the light disperseing all can be reflexed to circular glass cavity 2 the insides by reflector 5, the present invention plates the reflective membrane with high reflectance at the inner surface of reflector 5, further increases reflection of light rate.
As shown in Figure 2, when not existing in the situation of tracking error, sunray is through the gathering of optically focused parabolic lens 6, part light shines directly into 2 li of circular glass cavitys, a part enters circular glass cavity 2 the insides by the reflection of reflector 5, a light part that enters circular glass cavity 2 inside is directly absorbed by metal absorption tube 1, and another part is absorbed by metal absorption tube 1 after the reflectance coating one or many reflection on circular glass cavity 2 surfaces.
As shown in Figure 3, when existing in the situation of tracking error, light is offset, light reflection can be entered to circular glass cavity 2 the insides by reflector 5, part light is directly absorbed by metal absorption tube 1, and another part is absorbed by metal absorption tube 1 after the reflectance coating one or many reflection on circular glass cavity 2 surfaces.
Adopt reflector 5, the A/F of turning circular glass cavity 2 down that not only can be suitable, when existing in the situation of unavoidable error, has improved the absorption efficiency of circular glass cavity 2 greatly.
Claims (9)
1. for a middle high temperature cavity type thermal-collecting tube for slot type collecting system, it is characterized in that, comprise two reflectors, circular glass cavity and metal absorption tube, described metal absorption tube is positioned at circular glass cavity; Described two reflectors are placed in the outer surface of circular glass cavity, between the contact position of the outer surface of described two reflectors and circular glass cavity, leave light entrance port; Described two reflectors are arranged symmetrically with light entrance port, and its extended line intersection forms certain angle; The intersection point of the extended line of described two reflectors, the center of circle in circular glass chamber, the focus of the center of circle of metal absorption tube and optically focused parabolic lens is point-blank; Described circular glass chamber outer surface, is coated with one deck reflectance coating, the heat-insulation layer of described reflectance coating outer wrapping one deck beyond light entrance port.
2. a kind of middle high temperature cavity type thermal-collecting tube for slot type collecting system according to claim 1, is characterized in that: described reflectance coating is silver-colored reflectance coating.
3. a kind of middle high temperature cavity type thermal-collecting tube for slot type collecting system according to claim 1, is characterized in that: the thickness of described heat-insulation layer is 10mm.
4. a kind of middle high temperature cavity type thermal-collecting tube for slot type collecting system according to claim 1, is characterized in that: the outer wall of described metal absorption tube is 2～3mm apart from the beeline of circular glass cavity inner wall face.
5. a kind of middle high temperature cavity type thermal-collecting tube for slot type collecting system according to claim 1, is characterized in that: in described metal absorption tube, heat absorption working medium is housed, described metal absorption tube outer surface is coated with selective coating.
6. a kind of middle high temperature cavity type thermal-collecting tube for slot type collecting system according to claim 1, is characterized in that: the inner surface of described two reflectors is coated with reflective membrane.
7. a kind of middle high temperature cavity type thermal-collecting tube for slot type collecting system according to claim 1, is characterized in that: the A/F of described light entrance port is determined in the following manner:
The equation of parabolic concentration mirror is: y
2=4fx,
The equation of circular glass cavity is: (x-f-D)
2+ y
2=R
2,
The equation of metal absorption tube is: (x-f-D-R+r+l)
2+ y
2=r
2,
The equation of upper side reflector is:
lower side reflector and upper side reflector equation be about x axial symmetry,
Wherein, x, y is reference axis, R is the internal diameter of circular glass cavity, r is the external diameter of metal absorption tube, and f is the focal length of parabolic concentration mirror, and D is the distance between the focus of parabolic concentration mirror and the center of circle of circular glass cavity, l is the beeline between outer wall and the circular glass cavity inner wall of metal absorption tube, and α is the angle of reflector and x between centers;
The A/F of described light entrance port is the width between the equation of two triangle reflection plates and the intersection point of the equation of circular glass cavity.
8. according to a kind of middle high temperature cavity type thermal-collecting tube for slot type collecting system described in claim 1 or 7, it is characterized in that: the angle between described two reflectors is greater than the angle that optically focused parabolic lens edge reflections light forms.
9. a kind of middle high temperature cavity type thermal-collecting tube for slot type collecting system according to claim 8, it is characterized in that: when optically focused parabolic lens focal length is 800mm, optically focused parabolic lens A/F is 1m, and when tracking accuracy is 0.2 ゜, the angle between described two reflectors is 80 ゜～100 ゜.
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|---|---|---|---|
| CN201410305338.8A CN104048429B (en) | 2014-06-27 | 2014-06-27 | A kind of for high temperature cavity type thermal-collecting tube in slot type collecting system |
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|---|---|---|---|
| CN201410305338.8A CN104048429B (en) | 2014-06-27 | 2014-06-27 | A kind of for high temperature cavity type thermal-collecting tube in slot type collecting system |
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| CN104048429B CN104048429B (en) | 2015-11-18 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104390379A (en) * | 2014-11-26 | 2015-03-04 | 中海阳能源集团股份有限公司 | Cavity type heat collecting pipe for solar heat collection |
| CN106766257A (en) * | 2016-12-30 | 2017-05-31 | 东南大学 | A kind of trough type solar heat-collector |
| CN106766282A (en) * | 2017-01-23 | 2017-05-31 | 河海大学常州校区 | A kind of elliptical cavity formula thermal-collecting tube external thermal insulation forming method |
| CN111473526A (en) * | 2020-04-14 | 2020-07-31 | 骊阳(广东)节能科技股份有限公司 | Parabolic trough type solar heat collector |
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| CN102455068A (en) * | 2010-10-25 | 2012-05-16 | 北京印刷学院 | Solar hot-water power generation assembly with parabolic cylinder light concentration and lighting |
| CN103225900A (en) * | 2013-04-25 | 2013-07-31 | 桑夏太阳能股份有限公司 | Pressure-bearing type solar collector based on groove-type parabolic mirror |
| CN204329362U (en) * | 2014-06-27 | 2015-05-13 | 南通河海大学海洋与近海工程研究院 | A kind of for high temperature cavity type thermal-collecting tube in slot type collecting system |
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2014
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Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US4091796A (en) * | 1976-08-16 | 1978-05-30 | Owens-Illinois, Inc. | Solar energy collection apparatus |
| CN101655286A (en) * | 2008-08-20 | 2010-02-24 | 刘玉山 | Cavity-type solar collector |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104390379A (en) * | 2014-11-26 | 2015-03-04 | 中海阳能源集团股份有限公司 | Cavity type heat collecting pipe for solar heat collection |
| CN106766257A (en) * | 2016-12-30 | 2017-05-31 | 东南大学 | A kind of trough type solar heat-collector |
| CN106766282A (en) * | 2017-01-23 | 2017-05-31 | 河海大学常州校区 | A kind of elliptical cavity formula thermal-collecting tube external thermal insulation forming method |
| CN111473526A (en) * | 2020-04-14 | 2020-07-31 | 骊阳(广东)节能科技股份有限公司 | Parabolic trough type solar heat collector |
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| CN104048429B (en) | 2015-11-18 |
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