CN103256724B - A kind of solar concentrating collector and method for designing thereof - Google Patents

A kind of solar concentrating collector and method for designing thereof Download PDF

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CN103256724B
CN103256724B CN201310162862.XA CN201310162862A CN103256724B CN 103256724 B CN103256724 B CN 103256724B CN 201310162862 A CN201310162862 A CN 201310162862A CN 103256724 B CN103256724 B CN 103256724B
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reflection mirror
parabola
endothermic tube
equal light
principal reflection
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CN103256724A (en
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何雅玲
王坤
李明佳
程泽东
崔福庆
郑章靖
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Xian Jiaotong University
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Xian Jiaotong University
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/40—Solar thermal energy, e.g. solar towers
    • Y02E10/44—Heat exchange systems

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Abstract

The invention discloses a kind of solar concentrating collector and method for designing thereof, parabola principal reflection mirror is set; On the symmetry axis of parabola principal reflection mirror cross section, and inside parabola principal reflection mirror focal line, vacuum heat collection pipe is installed; Outside the focal line of parabola principal reflection mirror, install equal light reflection mirror, equal light reflection mirror is oppositely arranged with the opening of parabola principal reflection mirror and is fixedly connected with.Vacuum heat collection pipe is arranged in below parabola principal reflection mirror focal line position by the present invention, set up equal light reflection mirror and positioned opposite with parabola principal reflection mirror opening, can make all have solar radiant energy to distribute with top bottom endothermic tube, the homogenizing sun flux-density distribution of endothermic tube wall, reduce thermograde and the maximum temperature of endothermic tube wall, series of problems energy-flux density inequality can being avoided to bring from root, improves the security performance of thermal-collecting tube.

Description

A kind of solar concentrating collector and method for designing thereof
Technical field
The invention belongs to solar energy utilization technique field, be specifically related to a kind of the groove type solar concentrating collector with equal light reflection mirror and the method for designing thereof that can obtain sun flux-density distribution, raising security performance comparatively uniformly on endothermic tube surface.
Background technology
Trough type solar power generation technology is solar energy thermal-power-generating technology the most ripe at present, mainly adopts conduction oil, water/steam as heat-transfer working medium.No matter adopt which kind of heat-transfer working medium, because solar radiant energy focuses on bottom endothermic tube by traditional condenser system, the solar energy current density distribution on endothermic tube surface is very uneven.Because the convection transfer rate of heat absorption tube wall thermal conductivity factor, heat absorption tube wall and heat-transfer fluid is all limited, uneven sun flux-density distribution forms larger thermograde by causing endothermic tube wall.This brings stern challenge to efficient, the safe operation of collecting system, mainly there is following several respects problem: (1) endothermic tube wall temperature gradient is large, by producing larger thermal stress, making endothermic tube flexural deformation, departing from parabolic condenser focal line position, increase optical loss, be out of shape excessive, high temperature endothermic pipe will be made to touch glass bushing, cause glass bushing broken, vacuum failure, heat loss increases; (2) local temperature is too high, and the emissivity of endothermic tube Surface absorption coating will increase thereupon, degraded even occurs and comes off, heat loss can be caused to increase on the one hand, limit the maximum operation (service) temperature of thermal-collecting tube on the other hand; (3) solar energy stream concentrates on endothermic tube surface bottom portion, and endothermic tube wall can not be made to be fully used, and reduces the acceptable solar radiant energy total amount in endothermic tube surface.
At present for the drawback that endothermic tube external solar current density inequality is brought, Chinese scholars has proposed some solutions.Such as, Y.Aldali and T.Muneer etc. propose at endothermic tube internal placement helical fin, with the heat convection of augmentation of heat transfer working medium with heat absorption tube wall, reduce endothermic tube wall temperature gradient.He Yaling etc. propose a kind of focussing groove type solar thermal absorber (He Yaling of single side multi-longitudinal whorl strengthened heat exchange, Cheng Zedong, inscription on pottery select etc. a kind of focussing groove type solar thermal absorber of single side multi-longitudinal whorl strengthened heat exchange), can efficient low-resistance ground augmentation of heat transfer working medium and the heat convection of heat absorption tube wall, reduce endothermic tube wall temperature difference.V.Flores etc. propose to adopt copper-steel compound endothermic tube, and the thermal conductivity factor improving heat absorption tube wall can lower tube wall temperature gradient, alleviates the phenomenon that in DSG technology, endothermic tube is bending.Above technology reduces endothermic tube wall temperature gradient by improving heat-transfer working medium with the heat absorption convection transfer rate of tube wall or the thermal conductivity factor of the tube wall that absorbs heat, and can alleviate the drawback that uneven energy flow point cloth brings to a certain extent, but can not solve completely.Therefore we wish to design a kind of concentrating collector that can obtain comparatively uniform flux-density distribution on endothermic tube surface, from a series of drawback that root avoids uneven flux-density distribution to bring.
Summary of the invention
The object of the invention is to overcome above-mentioned the problems of the prior art, there is provided a kind of solar concentrating collector with equal light reflection mirror and the method for designing thereof that can avoid the problems such as the endothermic tube wall surface temperature gradient caused by the solar energy current density skewness of endothermic tube surface is large, heat absorption tube wall local temperature is too high, endothermic tube flexural deformation, this concentrating collector can obtain comparatively uniform sun flux-density distribution on endothermic tube surface.
For achieving the above object, of the present invention adopted technical scheme is:
A method for designing for solar concentrating collector, comprises the following steps:
1) parabola principal reflection mirror is set, with the focus O of parabola principal reflection mirror cross section for the origin of coordinates, with the symmetry axis of parabola principal reflection mirror cross section for Y-axis, to cross the initial point straight line vertical with Y-axis for X-axis, builds two-dimentional X-Y rectangular coordinate system;
2) on the symmetry axis of parabola principal reflection mirror cross section, and inside parabola principal reflection mirror focal line, vacuum heat collection pipe is installed;
3) outside the focal line of parabola principal reflection mirror, install equal light reflection mirror, the opening of equal light reflection mirror and parabola principal reflection mirror is oppositely arranged.
Above-mentioned steps 2) in, vacuum heat collection pipe is made up of endothermic tube and the glass bushing be enclosed within outside endothermic tube.
Above-mentioned endothermic tube is arranged on the symmetry axis below parabola principal reflection mirror focal line, to make a part of light directly reflex to bottom endothermic tube after parabola principal reflection mirror, another part light is by being radiated at the top of endothermic tube after the reflection of equal light reflection mirror second time.
The defining method of above-mentioned endothermic tube installation site is as follows:
First the C on selected parabola principal reflection mirror 1(X c1, Y c1) and C 2(X c2, Y c2) point, wherein C 1and C 2point is symmetrical about the symmetry axis of parabola principal reflection mirror, and the marginal point on parabola principal reflection mirror is respectively E and F; C on parabola principal reflection mirror 1c 2the reflection ray of part is directly beaten bottom endothermic tube, EC 1and FC 2the reflection ray of part then arrives equal light reflection mirror, after secondary reflection again, get to endothermic tube top; Under this two-dimentional X-Y rectangular coordinate system, the curvilinear equation of parabola principal reflection mirror in X-Y plane is:
y = x 2 4 f 1 - f 1 - - - ( 1 )
Wherein, f 1for principal reflection mirror focal length;
Parabola principal reflection mirror (1) is at C 1(X c1, Y c1) reflection ray put and straight line C 1the equation of O is:
Y C1x-X C1y＝0 （2）
If the central coordinate of circle of endothermic tube (3) be (0, a), then endothermic tube (3) curvilinear equation is on an x-y plane:
x 2 + ( y - a ) 2 = R a 2 - - - ( 3 )
In formula, R afor endothermic tube radius;
To meet C on parabola principal reflection mirror 1c 2the reflection ray of part directly beats the bottom at endothermic tube, EC 1and FC 2the reflection ray of part then arrives the top that equal light reflection mirror gets to endothermic tube after secondary reflection again, C 1o place straight line should circle just and represented by equation (3) tangent, following relationship need be met:
| - X C 1 · a | X C 1 2 + Y C 1 2 = R a - - - ( 4 )
Endothermic tube central coordinate of circle can be tried to achieve thus determine the installation site of endothermic tube.
Above-mentioned equal light reflection mirror is composited by two symmetrical parabolic mirrors, and is fixed by connection bracket and parabola principal reflection mirror.The defining method of the geometric parameter of equal light reflection mirror is as follows:
The curvilinear equation of left side parabola on above-mentioned X-Y plane forming equal light reflection mirror can be expressed as:
y = - ( x + d ) 2 4 f 2 + ( f 2 + a ) - - - ( 5 )
In formula, f 2for parabola focal length; D is the distance that parabolic mirror symmetry axis departs from Y-axis, and just representing and departing from left, negative indication departs to the right; A is the center of circle ordinate of endothermic tube;
On the left of equal light reflection mirror, parabola should meet the following conditions: the marginal point E point on parabola principal reflection mirror and C 1the light that point reflection is come, i.e. straight line EO and straight line C 1o can arrive equal light reflection mirror, and arrives endothermic tube after secondary reflection again; The i.e. following condition of demand fulfillment:
(1) straight line OA, OC 1with parabola intersection point is had within the scope of x<0;
(2) straight line PM, QN and circle there is intersection point;
Wherein, P and Q is the point on equal light reflection mirror, M and N is the point on endothermic tube, and PM is the reflection ray that straight line EO reflects through equal light reflection mirror, and QN is straight line C 1the reflection ray that O reflects through equal light reflection mirror;
After the paraboloidal shape in left side and physical dimension are determined, right side parabola is arranged symmetrically with about Y-axis.
The width of above-mentioned equal light reflection mirror is 2w, and 2w >=| 2p|, p are the parabolical intersection point abscissa of straight line OE and equal light reflection mirror.
A kind of solar concentrating collector of the disclosed of the present invention, comprises parabola principal reflection mirror, vacuum heat collection pipe and equal light reflection mirror; The opening of described parabola principal reflection mirror and equal light reflection mirror is oppositely arranged; Described vacuum heat collection pipe is arranged on the inner side of parabola principal reflection mirror focal line, and a part of light is directly reflexed to bottom endothermic tube after parabola principal reflection mirror, and another part light is by being radiated at the top of endothermic tube after the reflection of equal light reflection mirror second time.
Above-mentioned vacuum heat collection pipe is made up of endothermic tube and the glass bushing be enclosed within outside endothermic tube.
Above-mentioned equal light reflection mirror is composited by two symmetrical parabolic mirrors, and is fixed by connection bracket and parabola principal reflection mirror.
With the focus O of parabola principal reflection mirror cross section for the origin of coordinates, with the symmetry axis of parabola principal reflection mirror cross section for Y-axis, to cross the initial point straight line vertical with Y-axis for X-axis, build two-dimentional X-Y rectangular coordinate system;
The central coordinate of circle of described endothermic tube (3) is
The curvilinear equation of equal light reflection mirror (2) left side parabola on above-mentioned X-Y plane can be expressed as:
y = - ( x + d ) 2 4 f 2 + ( f 2 + a )
And all light reflection mirror (2) left side parabola meets the following conditions:
(1) straight line OA, OC 1with parabola intersection point is had within the scope of x<0;
(2) straight line PM, QN and circle there is intersection point;
Wherein, P and Q is the point on equal light reflection mirror (2), M and N is the point on endothermic tube (3), and PM is the reflection ray that straight line EO reflects through equal light reflection mirror, and QN is straight line C 1the reflection ray that O reflects through equal light reflection mirror; After the paraboloidal shape in left side and physical dimension are determined, right side parabola is arranged symmetrically with about Y-axis.
Compared with prior art, the present invention has following beneficial effect:
Vacuum heat collection pipe is arranged in below parabola principal reflection mirror focal line position by the present invention, set up equal light reflection mirror, positioned opposite with parabola principal reflection mirror opening, can make all have solar radiant energy to distribute with top bottom endothermic tube, the homogenizing sun flux-density distribution of endothermic tube wall surface, reduce endothermic tube wall surface temperature gradient and maximum temperature, a series of problem energy-flux density inequality can being avoided to bring from root; In addition, the light arrived on equal light reflection mirror arrives endothermic tube top after equal light reflection mirror primary event, reduces the multiple reflections of light; Meanwhile, the size of equal light reflection mirror is relatively little, and the eclipsing loss caused light is less, and therefore the present invention farthest can reduce optical loss.
Further, parabola principal reflection mirror of the present invention and equal light reflection mirror connection bracket are fixed, and adopt same set of tracking means, can not increase the complexity of tracking system.
Accompanying drawing explanation
Fig. 1-1 is application principle figure of the present invention;
Fig. 1-2 is the structural representation of the equal light reflection mirror of the present invention;
Fig. 1-3 is tomograph of the present invention;
Fig. 2 is light path schematic diagram of the present invention;
Fig. 3-1 is traditional slot type concentrating collector contrast schematic diagram;
Fig. 3-2 is the sun flux-density distribution on traditional slot type concentrating collector and endothermic tube surface of the present invention, and wherein abscissa is endothermic tube cross section circumferential position, and ordinate is the solar energy current density on corresponding circumferential position endothermic tube surface.
Wherein, 1 is parabola principal reflection mirror; 2 is equal light reflection mirror; 3 is endothermic tube; 4 is glass bushing.
Detailed description of the invention
Below in conjunction with accompanying drawing, the present invention is described in detail:
See Fig. 1-1, Fig. 1-2 and Fig. 1-3, solar concentrating collector of the present invention, comprise parabola principal reflection mirror 1, vacuum heat collection pipe and equal light reflection mirror 2, wherein vacuum heat collection pipe is made up of endothermic tube 3 and the glass bushing 4 be enclosed within outside endothermic tube 3, equal light reflection mirror 2 is composited by two symmetrical parabolic mirrors, and is fixed by connection bracket and parabola principal reflection mirror 1; Parabola principal reflection mirror 1 is oppositely arranged with the opening of equal light reflection mirror 2; As shown in Figure 2, vacuum heat collection pipe is arranged on the inner side of parabola principal reflection mirror 1 focal line, a part of light is directly reflexed to bottom endothermic tube 3 after parabola principal reflection mirror 1, and another part light is by being radiated at the top of endothermic tube 3 after the reflection of equal light reflection mirror 2 second time.
With the focus O of parabola principal reflection mirror 1 cross section for the origin of coordinates, with the symmetry axis of parabola principal reflection mirror 1 cross section for Y-axis, to cross the initial point straight line vertical with Y-axis for X-axis, build two-dimentional X-Y rectangular coordinate system;
The central coordinate of circle of described endothermic tube 3 is
On the left of equal light reflection mirror 2, the curvilinear equation of parabola on above-mentioned X-Y plane can be expressed as:
y = - ( x + d ) 2 4 f 2 + ( f 2 + a )
And parabola meets the following conditions on the left of equal light reflection mirror 2:
(1) straight line OA, OC 1with parabola intersection point is had within the scope of x<0;
(2) straight line PM, QN and circle there is intersection point;
Wherein, P and Q is the point on equal light reflection mirror (2), M and N is the point on endothermic tube 3, and PM is the reflection ray that straight line EO reflects through equal light reflection mirror, and QN is straight line C 1the reflection ray that O reflects through equal light reflection mirror; After the paraboloidal shape in left side and physical dimension are determined, right side parabola is arranged symmetrically with about Y-axis.
The invention also discloses a kind of method for designing of solar concentrating collector, comprise the following steps:
1) parabola principal reflection mirror 1 is set, with the focus O of parabola principal reflection mirror 1 cross section for the origin of coordinates, with the symmetry axis of parabola principal reflection mirror 1 cross section for Y-axis, to cross the initial point straight line vertical with Y-axis for X-axis, builds two-dimentional X-Y rectangular coordinate system;
2) on the symmetry axis of parabola principal reflection mirror 1 cross section, and inside parabola principal reflection mirror 1 focal line, vacuum heat collection pipe is installed; Vacuum heat collection pipe is made up of endothermic tube 3 and the glass bushing 4 be enclosed within outside endothermic tube 3; Endothermic tube 3 is arranged on the symmetry axis below parabola principal reflection mirror 1 focal line, to make a part of light directly reflex to after parabola principal reflection mirror 1 bottom endothermic tube 3, another part light is by being radiated at the top of endothermic tube 3 after the reflection of equal light reflection mirror 2 second time.Wherein the defining method of endothermic tube 3 installation site is as follows:
First the C on selected parabola principal reflection mirror 1 1(X c1, Y c1) and C 2(X c2, Y c2) point, wherein C 1and C 2point is symmetrical about the symmetry axis of parabola principal reflection mirror 1, and the marginal point on parabola principal reflection mirror 1 is respectively E and F; Under sunshine vertical incidence condition, C on parabola principal reflection mirror 1 1c 2the reflection ray of part is directly beaten bottom endothermic tube 3, EC 1and FC 2the reflection ray of part then arrives equal light reflection mirror 2, after secondary reflection again, get to endothermic tube 3 top; Under this two-dimentional X-Y rectangular coordinate system, the curvilinear equation of parabola principal reflection mirror 1 in X-Y plane is:
y = x 2 4 f 1 - f 1 - - - ( 1 )
Wherein, f 1for principal reflection mirror focal length;
Parabola principal reflection mirror 1 is at C 1(X c1, Y c1) reflection ray put and straight line C 1the equation of O is:
Y C1x-X C1y＝0 （2）
If the central coordinate of circle of endothermic tube 3 be (0, a), then endothermic tube 3 curvilinear equation is on an x-y plane:
x 2 + ( y - a ) 2 = R a 2 - - - ( 3 )
In formula, R afor endothermic tube radius;
To meet C on parabola principal reflection mirror 1 1c 2the reflection ray of part is directly beaten in the bottom of endothermic tube 3, EC 1and FC 2the reflection ray of part then arrives the top that equal light reflection mirror 2 gets to endothermic tube 3 after secondary reflection again, C 1o place straight line should circle just and represented by equation (3) tangent, following relationship need be met:
| - X C 1 &CenterDot; a | X C 1 2 + Y C 1 2 = R a - - - ( 4 )
Endothermic tube central coordinate of circle can be tried to achieve thus determine the installation site of endothermic tube.
3) outside the focal line of parabola principal reflection mirror 1, install equal light reflection mirror 2, equal light reflection mirror 2 is oppositely arranged with the opening of parabola principal reflection mirror 1, and all light reflection mirror 2 overlaps with the focus of parabola principal reflection mirror 1.Equal light reflection mirror 2 is composited by two symmetrical parabolic mirrors, and is fixed by connection bracket and parabola principal reflection mirror 1; Wherein, the defining method of the geometric parameter of equal light reflection mirror 2 is as follows:
The curvilinear equation of left side parabola on above-mentioned X-Y plane forming equal light reflection mirror can be expressed as:
y = - ( x + d ) 2 4 f 2 + ( f 2 + a ) - - - ( 5 )
In formula, f 2for parabola focal length; D is the distance that parabolic mirror symmetry axis departs from Y-axis, departs from left, if negative indication departs to the right if just representing; A is the center of circle ordinate of endothermic tube;
Because two parabolic mirrors forming equal light reflection mirror are arranged symmetrically with, so determine one of them shape and physical dimension, another one is determined thereupon; Illustrating for left side parabola, to ask the some light directly do not focused on endothermic tube in the light of parabola primary mirror reflects all to get to equal light reflection mirror 2, and arriving endothermic tube top after equal light reflection mirror reflection; Therefore all the left side parabola of light reflection mirror should meet: the marginal point E point on parabola principal reflection mirror 1 and C 1the light that point reflection is come, i.e. straight line EO and straight line C 1o can arrive equal light reflection mirror 2, and arrives endothermic tube after secondary reflection again; The i.e. following condition of demand fulfillment:
(1) straight line OA, OC 1with parabola intersection point is had within the scope of x<0;
(2) straight line PM, QN and circle there is intersection point;
Wherein, P and Q is the point on equal light reflection mirror 2, M and N is the point on endothermic tube 3, and PM is the reflection ray that straight line EO reflects through equal light reflection mirror, and QN is straight line C 1the reflection ray that O reflects through equal light reflection mirror;
After the paraboloidal shape in left side and physical dimension are determined, right side parabola is arranged symmetrically with about Y-axis.
The width of above-mentioned equal light reflection mirror is 2w, and 2w >=| 2p|, p are the parabolical intersection point abscissa of straight line OE and equal light reflection mirror.
After determining the geometric parameter of endothermic tube position, all light reflection mirror, the solar energy current density distribution situation on the method simulation endothermic tube surface of operational light trace, if uniformity is not good, again the C1(C2 on parabola principal reflection mirror can be selected) point, again determine the position of endothermic tube and the geometric parameter of equal light reflection mirror, until the uniformity of the sun flux-density distribution on endothermic tube surface reaches requirement.
Concrete implementation method as shown in Figure 2, the size of given parabola principal reflection mirror, endothermic tube and glass bushing, as shown in table 1.With the focus of parabola principal reflection mirror 1 cross section for the origin of coordinates, with the center line of parabola principal reflection mirror 1 cross section for Y-axis, to cross the initial point straight line vertical with Y-axis for X-axis, build two-dimentional X-Y rectangular coordinate system.After iterative cycles, the C on final selected parabola principal reflection mirror 1the abscissa of point is 1.8m, symmetrically, and C 2the abscissa of point is-1.8m.Straight line OC 1determine endothermic tube central coordinate of circle (0 ,-0.044) m with circle is tangent, determine endothermic tube 3 position thus; Endothermic tube 3 is moved down 0.044m together with whole endothermic tube from the focal position of parabola principal reflection mirror 1.Under vertical incidence condition, C on parabola principal reflection mirror 1 1c 2the reflection ray of part focuses on bottom endothermic tube, EC 1and FC 2two-part reflection ray then can not focus on endothermic tube surface, need arrange equal light reflection mirror 2 and this part light be reflexed to again endothermic tube 3 surface.As previously mentioned, equal light reflection mirror 2 adopts composite parabolic shape, positioned opposite with parabola principal reflection mirror opening.The curvilinear equation in a certain cross section of single parabola is: in order to EC on parabola principal reflection mirror can be made 1with FC 2the reflection ray of part arrives equal light reflection mirror 2, and after equal light reflection mirror 2 reflects, reach endothermic tube 3 surface, needs to choose suitable parameter f 2and parameter d.In the implementation case, f is chosen for left side parabola 2for 0.14m, d are-0.19m; Symmetrically, f is chosen for right side parabola 2for 0.14m, d are 0.19m.Due to straight line AO and parabola intersection point abscissa be-0.044m, so all the width 2w of light reflection mirror elects 0.088m as.
Above-described embodiment set forth in detail the concrete size of this novel concentrator heat collector of the present invention.Fig. 3-1 is the schematic diagram of traditional slot type solar concentrating collector, mainly comprises the vacuum heat absorbing pipe be made up of with glass bushing 4 parabolic mirror 1 and endothermic tube 3.In this case study on implementation, traditional slot type solar concentrating collector also adopts size as shown in table 1.
Fig. 3-2 gives the sun flux-density distribution on endothermic tube surface of the present invention, and in contrast, Fig. 3-2 gives the sun flux-density distribution on traditional slot type solar concentrating collector endothermic tube surface equally.
The key dimension of concentrating collector in table 1 case study on implementation
The above is only case study on implementation of the present invention, should be understood that under the prerequisite not departing from principle of the present invention, and also can carry out some retouchings and improvement, these improvements and modifications also should be considered as protection scope of the present invention.

Claims (4)

1. a method for designing for solar concentrating collector, is characterized in that, comprises the following steps:
1) parabola principal reflection mirror (1) is set, with the focus O of parabola principal reflection mirror (1) cross section for the origin of coordinates, with the symmetry axis of parabola principal reflection mirror (1) cross section for Y-axis, to cross the initial point straight line vertical with Y-axis for X-axis, build two-dimentional X-Y rectangular coordinate system;
2) on the symmetry axis of parabola principal reflection mirror (1) cross section, and inside parabola principal reflection mirror (1) focal line, vacuum heat collection pipe is installed; Vacuum heat collection pipe is made up of endothermic tube (3) and the glass bushing (4) be enclosed within outside endothermic tube (3);
Endothermic tube (3) is arranged on the symmetry axis below parabola principal reflection mirror (1) focal line, to make a part of light directly reflex to endothermic tube (3) bottom after parabola principal reflection mirror (1), another part light is by being radiated at the top of endothermic tube (3) after the reflection of equal light reflection mirror (2) second time;
The defining method of endothermic tube (3) installation site is as follows:
First the C on selected parabola principal reflection mirror (1) 1(X c1, Y c1) and C 2(X c2, Y c2) point, wherein C 1and C 2point is symmetrical about the symmetry axis of parabola principal reflection mirror (1), and the marginal point on parabola principal reflection mirror (1) is respectively E and F; The upper C of parabola principal reflection mirror (1) 1c 2the reflection ray of part is directly beaten in endothermic tube (3) bottom, EC 1and FC 2the reflection ray of part then arrives equal light reflection mirror (2), after secondary reflection again, get to endothermic tube (3) top; Under this two-dimentional X-Y rectangular coordinate system, the curvilinear equation of parabola principal reflection mirror (1) in X-Y plane is:
y = x 2 4 f 1 - f 1 - - - ( 1 )
Wherein, f 1for principal reflection mirror focal length;
Parabola principal reflection mirror (1) is at C 1(X c1, Y c1) reflection ray put and straight line C 1the equation of O is:
Y C1x-X C1y＝0 (2)
If the central coordinate of circle of endothermic tube (3) be (0, a), then endothermic tube (3) curvilinear equation is on an x-y plane:
x 2 + ( y - a ) 2 = R a 2 - - - ( 3 )
In formula, R afor endothermic tube radius;
To meet the upper C of parabola principal reflection mirror (1) 1c 2the reflection ray of part is directly beaten in the bottom of endothermic tube (3), EC 1and FC 2the reflection ray of part then arrives the top that equal light reflection mirror (2) gets to endothermic tube (3) after secondary reflection again, C 1o place straight line should circle just and represented by equation (3) tangent, following relationship need be met:
| - X C 1 &CenterDot; a | X C 1 2 + Y C 1 2 = R 2 - - - ( 4 )
Endothermic tube central coordinate of circle can be tried to achieve thus determine the installation site of endothermic tube;
3) outside the focal line of parabola principal reflection mirror (1), install equal light reflection mirror (2), equal light reflection mirror (2) is oppositely arranged with the opening of parabola principal reflection mirror (1);
4) after determining the geometric parameter of endothermic tube position, all light reflection mirror, by the solar energy current density distribution situation on the method simulation endothermic tube surface of ray tracing, if uniformity is not good, the C again on selected parabola principal reflection mirror 1and C 2point, determines the position of endothermic tube and the geometric parameter of equal light reflection mirror again, until the uniformity of the sun flux-density distribution on endothermic tube surface reaches requirement.
2. the method for designing of solar concentrating collector according to claim 1, it is characterized in that: described equal light reflection mirror (2) is composited by two symmetrical parabolic mirrors, and fixed by connection bracket and parabola principal reflection mirror (1); The defining method of the geometric parameter of described equal light reflection mirror (2) is as follows:
The curvilinear equation of left side parabola on above-mentioned X-Y plane forming equal light reflection mirror can be expressed as:
y = - ( x + d ) 2 4 f 2 + ( f 2 + a ) - - - ( 5 )
In formula, f 2for parabola focal length; D is the distance that parabolic mirror symmetry axis departs from Y-axis, and just representing and departing from left, negative indication departs to the right; A is the center of circle ordinate of endothermic tube;
On the left of equal light reflection mirror, parabola should meet the following conditions: the marginal point E point on parabola principal reflection mirror (1) and C 1the light that point reflection is come, i.e. straight line EO and straight line C 1o can arrive equal light reflection mirror (2), and arrives endothermic tube after secondary reflection again; The i.e. following condition of demand fulfillment:
(1) straight line OA, OC 1with parabola intersection point is had within the scope of x<0;
(2) straight line PM, QN and circle there is intersection point;
Wherein, P and Q is the point on equal light reflection mirror (2), M and N is the point on endothermic tube (3), and PM is the reflection ray that straight line EO reflects through equal light reflection mirror, and QN is straight line C 1the reflection ray that O reflects through equal light reflection mirror;
After the paraboloidal shape in left side and physical dimension are determined, right side parabola is arranged symmetrically with about Y-axis.
3. the method for designing of solar concentrating collector according to claim 1, is characterized in that: the width of described equal light reflection mirror is 2w, and 2w >=| 2p|, p are the parabolical intersection point abscissa of straight line OE and equal light reflection mirror.
4. according to a solar concentrating collector for method design described in Claims 2 or 3, it is characterized in that: comprise parabola principal reflection mirror (1), vacuum heat collection pipe and equal light reflection mirror (2); Described parabola principal reflection mirror (1) is oppositely arranged with the opening of equal light reflection mirror (2); Described vacuum heat collection pipe is arranged on the inner side of parabola principal reflection mirror (1) focal line, make a part of light after parabola principal reflection mirror (1), directly reflex to endothermic tube (3) bottom, another part light is by being radiated at the top of endothermic tube (3) after the reflection of equal light reflection mirror (2) second time; Described equal light reflection mirror (2) is composited by two symmetrical parabolic mirrors, and is fixed by connection bracket and parabola principal reflection mirror (1);
With the focus O of parabola principal reflection mirror (1) cross section for the origin of coordinates, with the symmetry axis of parabola principal reflection mirror (1) cross section for Y-axis, to cross the initial point straight line vertical with Y-axis for X-axis, build two-dimentional X-Y rectangular coordinate system; C on selected parabola principal reflection mirror (1) 1(X c1, Y c1) and C 2(X c2, Y c2) point, wherein C 1and C 2point is symmetrical about the symmetry axis of parabola principal reflection mirror (1), and the marginal point on parabola principal reflection mirror (1) is respectively E and F; The upper C of parabola principal reflection mirror (1) 1c 2the reflection ray of part is directly beaten in endothermic tube (3) bottom, EC 1and FC 2the reflection ray of part then arrives equal light reflection mirror (2), after secondary reflection again, get to endothermic tube (3) top;
The central coordinate of circle of described endothermic tube (3) is
Wherein, R afor endothermic tube radius, X c1for C selected in two-dimentional X-Y rectangular coordinate system 1the abscissa of point, Y c1for C 1the coordinate in length and breadth of point;
The curvilinear equation of equal light reflection mirror (2) left side parabola on above-mentioned X-Y plane can be expressed as:
y = - ( x + d ) 2 4 f 2 + ( f 2 + a )
Wherein, f 2for parabola focal length; D is the distance that parabolic mirror symmetry axis departs from Y-axis, and just representing and departing from left, negative indication departs to the right; A is the center of circle ordinate of endothermic tube;
And all light reflection mirror (2) left side parabola meets the following conditions:
(1) straight line OA, OC 1with parabola intersection point is had within the scope of x<0;
(2) straight line PM, QN and circle there is intersection point;
Wherein, A be the central coordinate of circle place of endothermic tube (3) point (0, a); P and Q is the point on equal light reflection mirror (2), M and N is the point on endothermic tube (3), and PM is the reflection ray that straight line EO reflects through equal light reflection mirror, and QN is straight line C 1the reflection ray that O reflects through equal light reflection mirror; After the paraboloidal shape in left side and physical dimension are determined, right side parabola is arranged symmetrically with about Y-axis.
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CN104329810B (en) * 2014-11-14 2016-02-24 西安交通大学 A kind of uniform condensing device and method for designing thereof
CN104406312A (en) * 2014-12-09 2015-03-11 中国科学院工程热物理研究所 Transmission-reflection linear spotlight heat collector
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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN201037705Y (en) * 2006-04-05 2008-03-19 北京天瑞星真空技术开发有限公司 Light gathering type solar energy heat collector
CN102620442A (en) * 2012-02-28 2012-08-01 中国石油大学(华东) Solar heat collector based on groove type parabolic mirror and artificial blackbody

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN201037705Y (en) * 2006-04-05 2008-03-19 北京天瑞星真空技术开发有限公司 Light gathering type solar energy heat collector
CN102620442A (en) * 2012-02-28 2012-08-01 中国石油大学(华东) Solar heat collector based on groove type parabolic mirror and artificial blackbody

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