CN203550239U - Refraction type secondary solar collector - Google Patents

Abstract

The utility model discloses a refraction type secondary solar collector which comprises a segment part, a collecting section, a transmitting section and an extracting section. Light rays enter the collecting section through the arc-shaped surface of the segment, the geometrical shape of the cross section of the collecting section is a trapezoid, the long bottom edge of the trapezoid is the spot radius of the segment part, the short bottom edge of the trapezoid extends in parallel to form the transmitting section, the transmitting section extends and shrinks to form the conical extraction section, the segment part enables incident sunlight to enter the collecting section through refraction, the collecting section carries out transmission and collection on the sunlight, the transmitting section transmits the collected sunlight forwards through wall reflection, the extracting section projects collected sunlight to the wall of a heat extractor, and thus photothermal conversion is completed. According to the refraction type secondary solar collector, the incident sunlight is collected again, controlled and output to the wall of the heat extractor through a refraction mode, the concentration ratio is moderate, high temperature can be resisted, the output solar current density distribution can be controlled, solar high-temperature thermal conversion efficiency is improved, and the service life is prolonged.

Description

A kind of refractive solar energy Second Aggregation device

Technical field

The utility model belongs to heliotechnics application, and specifically, the utility model relates to the refractive solar energy Second Aggregation device that a kind of sunshine collector being converged by refraction is assembled again.

Background technology

The hot conversion thermal energy efficiency of solar energy high temperature is high, is the important technology approach that develops solar energy resources.Due to reasons such as geometry, all kinds of optical parallaxs, the actual optically focused of a high power collector, than also little, affects inversion temperature and the efficiency of solar energy, has restricted the value of exploiting and utilizing of solar energy.Adopt Second Aggregation device, the sun light beam converging through collector assembled again, realize sunshine twice gathering (optically focused of twice gathering than be optically focused than and the product of secondary condensation ratio), be to realize the hot key of changing of solar high-temperature high-efficiency.

On State Intellectual Property Office of the People's Republic of China website, find 4 of the patents relevant to the utility model, specifying information is as follows:

(1) general forever; Xiaxin woods; Talk peace; Zhang Xiaochen; Yuan Yuan; Wang Fuqiang. a kind of cavity type solar heat absorber with optical window. application (patent) number: 200910310370.4

This patent feature: it relates to technical field of solar, its object is inhomogeneous in order to solve the solar radiation heat flux distribution that existing solar heat absorber absorbs, cause the too high and easy problem of burning of heat dump local temperature, it comprises heat dump and endothermic tube, and endothermic tube according to the inner chamber body shape dish of heat dump on the inwall of heat dump, the cavity shape of heat dump is hemispherical, it also comprises upwards-raised optical body and backplate, described heat dump is cavity body, backplate is annular, backplate is fixed on heat dump entrance, upwards-raised optical body is arranged on backplate, upwards-raised optical body is convex surface towards the inlet face of heat dump, the inlet face of heat dump is plane dorsad.Concrete structure as shown in Figure 1.

(2) Long Xinfeng; Hair pine. containing the spherical cavate solar heat absorber of indent cloche. application (patent) number: 201110255144.8

This patent feature: this cavity type heat absorber is the spherical heat dump of open type that adopts indent cloche, has both had the ability that open type cavity type heat absorber is caught light, has again the feature of the cavity type heat absorber low-loss of accent band windowpane.This cavity type heat absorber has reflecting type deep bead simultaneously, can strengthen the seizure to stray light, reduces inner surface heat radiation and outside naturally wind-induced convection heat transfer' heat-transfer by convection loss.Between the inside and outside shell of this cavity type heat absorber, contain vacuum layer, can effectively reduce the heat losing by housing.Concrete structure as shown in Figure 2.

(3) Huang Guoping; Flood is established; Xia Chen; Fu Xin; Kang Jianxiong. a kind of high-efficiency solar heat dump that absorbs cone configuration based on photo-thermal. application (patent) number: 201310041996.6

This patent feature: the utility model relates to a kind of solar heat absorber that absorbs cone configuration based on photo-thermal, comprise seal cover, pipe box, airflow line, absorber, cloche and absorber securing member, it is characterized in that absorber is prismoid shaped structure, each plane can separately be manufactured; Each plane is photo-thermal and absorbs cone-plate, and surface distributed, by a plurality of sharp-pointed pyramids, is made by high heat conduction porosity and looseness material; Cloche is truncated cone-shaped; Described seal cover, absorber, cloche form enclosed cavity volume, and air enters cavity volume by the air admission hole of seal cover, then are heated and take away solar energy through porous media photo-thermal absorption cone-plate, finally along airflow line, by the heat dump port of export, are flowed out.Advantage: the problem such as improve that existing heat dump exists that heat absorption efficiency is low, processing difficulties, internal flow loss are large.Can use separately, also can be used in combination mutually by interface; Mainly be applicable to solar heat power conversion system, guarantee that it can efficiently move.Concrete structure as shown in Figure 3.

(4) Wang Fuqiang; Lin Yi; Li Xia Yun etc. a kind of bottom surface is the hemispheroidal cavity type solar heat absorber of curved surface. application (patent) number: 201220612985.X

This patent feature: a kind of bottom surface is the hemispheroidal cavity type solar heat absorber of curved surface, and the utility model relates to a kind of solar heat absorber.The utility model is in order to solve the problem that cannot be covered with whole bottom surface in metal tube coiling process, and heat dump exists the problem of optical loss.The bottom of heat dump housing is curved surface hemisphere, heat dump side section spiral coil is wrapped in the side inner walls of heat dump housing, heat dump bottom surface section spiral coil is wrapped on the bottom surface of heat dump housing, heat dump side section spiral coil is communicated with heat dump bottom surface section spiral coil, on the outer surface of heat dump housing, be provided with silica wool heat-insulation layer, working media inlet tube is located in silica wool heat-insulation layer, and working media inlet tube is communicated with the entrance point of heat dump side section spiral coil, working media outlet is located in silica wool heat-insulation layer, and working media outlet is communicated with the port of export of heat dump side section spiral coil.Concrete structure as shown in Figure 4.

Analyzing above-mentioned existing patent can find, they mainly the geometry by design heat dump improve and assemble solar energy current density and analyze, effect is limited.

Utility model content

For the three-dimensional composite parabolic collector of current 3D CPC() Second Aggregation device optically focused is than little, need to design the deficiency of complicated cooling system, the utility model proposes a kind of optically focused than moderate, the solar energy current density controlled high temperature resistant refraction type Second Aggregation device that distributes is assembled in output.

The technical scheme that the utility model provides is: a kind of refractive solar energy Second Aggregation device, comprise segment part, collection sections, span line and extract section, light enters collection sections from the curved surfaces of segment, the cross-sectional geometry of the section of gathering is trapezoidal, the spot radius that trapezoidal long base is segment, trapezoidal short base extends in parallel, and is configured as span line, span line extends and shrinks, and is configured as the extraction section of taper; Described span line and extraction section extend into heat dump inside; Heat dump is the spherical cavity body of semiellipse, and this cavity body has an opening, and described span line and extraction section extend into heat dump inside by opening; Segment part enters collection sections by incident sunshine by refraction; Collection sections is transmitted gathering to the sunshine of incident; Span line is reflected and will be assembled sunshine and transmit forward by wall; Extract section gathering sunshine is projected to heat dump wall, complete photo-thermal conversion.

The radius R of described segment _s=D ₁/ (2sin θ), the spot radius that wherein D1 is segment, half of the central angle of the curved surfaces that θ is segment.

Collection sections height $h_1=D_1\frac{\left(\sin {\mathrm{\μ}}_1\right)\left(\sin {\mathrm{\μ}}_2\right)}{\sin ({\mathrm{\μ}}_1+{\mathrm{\μ}}_2)},$

In formula,

Wherein, the maximum deflection that φ is segment, n is raw-material refractive index, half of the central angle of the curved surfaces that θ is segment.

Span line diameter D ₂=D ₁-2h ₁tan μ ₃,

In formula,

Wherein, the spot radius that D1 is segment, h1 is collection sections height, n is raw-material refractive index, half of the central angle of the curved surfaces that θ is segment.

A design parameter of span line height h2 and extraction section height h3 does not have strict definition, and concrete value is rule of thumb determined.Research shows, h2 value is less, and the efficiency of transmission of sunshine is higher, but the distribution that can flow on heat dump wall is poor, and vice versa.For guaranteeing there is good efficiency of transmission and can flow distribution performance, generally get span line height h2=2～3D2, extract section height h3=3～5D2, wherein, D2 is span line diameter.

The beneficial effects of the utility model are:

The utility model is by structural design, proposes a kind ofly by refraction mode, incident sunshine again to be assembled, and controlled and output to heat dump wall and assemble the Second Aggregation device that solar energy current density distributes.Optically focused is than refractive solar energy Second Aggregation device moderate, high temperature resistant and that output solar energy current density distributes controlled, high temperature thermal conversion efficiency and the service life of improving solar energy.Concrete advantage is as follows:

(1) optically focused is than high, and refraction type Second Aggregation device optically focused ratio of the present utility model is 6～8, is that 3D CPC optically focused is than 3 times of left and right of (～2-3).

(2) it is controlled that solar energy Density Distribution is assembled in output, by regulating span line and the length ratio that extracts section, can control the gathering solar energy Density Distribution that outputs to heat dump wall, is of value to the high temperature thermal conversion efficiency that improves solar energy.

(3) by the refraction type Second Aggregation device that adopts exotic material to make as sapphire, operating temperature is high, does not need cooling structure, and system architecture is simple, long service life.

Accompanying drawing explanation

When considered in conjunction with the accompanying drawings, by the detailed description with reference to below, can more completely understand better the utility model and easily learn wherein many advantages of following, but accompanying drawing described herein is used to provide further understanding of the present utility model, form a part of the present utility model, schematic description and description of the present utility model is used for explaining the utility model, does not form to improper restriction of the present utility model, wherein:

Fig. 1, Fig. 2, Fig. 3, Fig. 4 are that background technology is introduced structural representation;

Fig. 5 is RSC cross-sectional view of the present utility model;

Fig. 6 is RSC geometry schematic diagram of the present utility model;

Fig. 7 is the two-stage solar collector schematic diagram that single dish collector and RSC form.

The specific embodiment

For above-mentioned purpose of the present utility model, feature and advantage can be become apparent more, below in conjunction with the drawings and specific embodiments, the utility model is described in further detail.

Go out as shown in Figure 5, for improving the mechanical behavior under high temperature of refraction type Second Aggregation device (RSC:Refractive Secondary Concentrator), general monoblock raw material polishing processing integral forming (solid construction), raw material are generally sapphire high temperature resistant, that sunshine transmitance is high, quartz etc.According to functions difference, can be divided into segment part 1, collection sections 2, span line 3 and extract section 4, light enters collection sections 2 from the curved surfaces of segment 1, the cross-sectional geometry of the section of gathering 2 is trapezoidal, the spot radius D1 that trapezoidal long base is segment 1, trapezoidal short base D2 extends in parallel, be configured as span line 3, span line 3 extends and shrinks, and is configured as the extraction section 4 of taper; Segment part 1 enters collection sections 2 by incident sunshine by refraction; The sunshine of 2 pairs of incidents of collection sections transmits gathering; Span line 3 is reflected and will be assembled sunshine and transmit forward by wall; Extract section 4 gathering sunshine is projected to heat dump wall, complete photo-thermal conversion.Span line 2 and extraction section 3 extend into heat dump 5 inside.Heat dump 5 is the spherical cavity body of semiellipse, and this cavity body has an opening, and span line 3 and extraction section 4 extend into heat dump inside by opening.

The spot radius D1 that the geometry of RSC is mainly flowed by incident solar energy and maximum deflection φ determine, as shown in Figure 6.According to geometric optical theory, the air line distance of determining the upper and lower end points of spot radius D1(segment curved surfaces of segment) and maximum deflection φ (the maximum deflection of the incident sunshine after the reflection of collector) each physical dimension of RSC is expressed as follows:, half of segment central angle is θ (generally than the large 10 ° of left and right of φ).

(1) the radius R s of segment

R _s＝D ₁/(2sinθ) (1-1)

(2) collection sections height h1 is

$h_1=D_1\frac{\left(\sin {\mathrm{\μ}}_1\right)\left(\sin {\mathrm{\μ}}_2\right)}{\sin ({\mathrm{\μ}}_1+{\mathrm{\μ}}_2)}---(1-2)$

In formula,

Wherein, n is raw-material refractive index.

(3) span line diameter D2

D ₂＝D ₁-2h ₁tanμ ₃ (1-3)

In formula,

(4) span line height h2 and an extraction section height h3

A design parameter of span line height h2 and extraction section height h3 does not have strict definition, and concrete value is rule of thumb determined.Research shows, h2 value is less, and the efficiency of transmission of sunshine is higher, but the distribution that can flow on heat dump wall is poor, and vice versa.For guaranteeing there is good efficiency of transmission and can flow distribution performance, generally get

h2=2～3D2 （1-4）

h3=3～5D2 （1-5）

In formula, D2 is span line diameter, by formula (1-3), is calculated.

Above-mentioned parameter forms all design parameters of RSC.

The two-stage solar collector that single dish collector and RSC form of take is example, illustrate that RSC designs implementation process.As shown in Figure 7.The segment of RSC is arranged on the focal plane of single dish collector.Incide the lip-deep sunshine of RSC segment, by RSC refraction, entered in RSC collection sections, by reflection, by span line and extraction section, finally enter heat dump wall.

The focal length of known this single dish collector is f, and edge angle is φ (being the maximum deflection of incident sunshine in Fig. 6), and by calculating, the gathering sunshine spot radius of single dish collector is about D0.

RSC design parameter is desirable: D1=D0, θ=φ+10 °.Other design parameter of RSC can be according to formula (1-1)～(1-5) calculating obtains.

The explanation of above example is just for helping to understand core concept of the present utility model; , for one of ordinary skill in the art, according to thought of the present utility model, all will change in specific embodiments and applications, in sum, this description should not be construed as restriction of the present utility model meanwhile.

Claims (4)

1. a refractive solar energy Second Aggregation device, it is characterized in that, comprise segment part, collection sections, span line and extract section, light enters collection sections from the curved surfaces of segment, and the cross-sectional geometry of the section of gathering is trapezoidal, the spot radius that trapezoidal long base is segment, trapezoidal short base extends in parallel, be configured as span line, span line extends and shrinks, and is configured as the extraction section of taper; Span line and extraction section extend into heat dump inside; Heat dump is the spherical cavity body of semiellipse, and this cavity body has an opening, and span line and extraction section extend into heat dump inside by opening; Segment part enters collection sections by incident sunshine by refraction; Collection sections is transmitted gathering to the sunshine of incident; Span line is reflected and will be assembled sunshine and transmit forward by wall; Extract section gathering sunshine is projected to heat dump wall, complete photo-thermal conversion.

2. a kind of refractive solar energy Second Aggregation device according to claim 1, is characterized in that the radius R of described segment _s=D ₁/ (2sin θ), the spot radius that wherein D1 is segment, half of the central angle of the curved surfaces that θ is segment.

3. a kind of refractive solar energy Second Aggregation device according to claim 1, is characterized in that collection sections height

In formula,

Wherein, the maximum deflection that φ is segment, n is raw-material refractive index, half of the central angle of the curved surfaces that θ is segment.

4. a kind of refractive solar energy Second Aggregation device according to claim 1, is characterized in that span line diameter D ₂=D ₁-2h ₁tan μ ₃,

In formula,

Wherein, the spot radius that D1 is segment, h1 is collection sections height, n is raw-material refractive index, half of the central angle of the curved surfaces that θ is segment.

5 .a kind of refractive solar energy Second Aggregation device according to claim 1, is characterized in that, span line height h2=2～3D2 extracts section height h3=3～5D2, and wherein, D2 is span line diameter.

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