WO2017121178A1

WO2017121178A1 - 2d-tracking solar concentrator

Info

Publication number: WO2017121178A1
Application number: PCT/CN2016/104680
Authority: WO
Inventors: 徐盛之; 徐鸿盛
Original assignee: 徐盛之
Priority date: 2016-01-15
Filing date: 2016-11-04
Publication date: 2017-07-20
Also published as: CN105485936A; CN105485936B

Abstract

A 2D-tracking solar concentrator (100) comprises: a support frame (101); an outer frame (102) mounted to an upper portion of the support frame (101) via a first bearing (105), and rotatable about an axis extending in the east-west direction and with respect to the support frame (101); a concentrating mirror (103) having an arch-shaped reflective surface, mounted in the outer frame (102) via a second bearing (106), and rotatable about an axis extending in the south-north direction and with respect to the outer frame (102); and a solar collector (104) fixed at a focus position of the concentrating mirror (103). The 2D-tracking solar concentrator (100) can achieve omnidirectional tracking of sunlight, and employ an evacuated tube solar collector open at one end, thus lowering manufacturing costs.

Description

Specification Name of Invention: Two-dimensional tracking solar concentrating device Technical field

[0001] The present invention relates to the field of solar energy applications, and more particularly to a two-dimensional tracking solar concentrating device.

Background technique

[0002] Solar energy has been widely used as an environmentally friendly energy source. At present, the tracking concentrating devices applied by solar energy are mainly trough parabolic tracking concentrating devices and tower-type heliostat concentrating tracking devices.

[0003] Current trough parabolic concentrating tracking devices are mostly one-dimensionally tracked and are commonly used for solar thermal power generation.

The working condition is that in the northern hemisphere, the mirror is usually facing south, and the longer two mirrored groove sides are placed in the east-west direction. The tracking device adjusts the angle between the curved surface of the curved surface and the horizontal line in the north-south direction, so as to track the change of the solar elevation angle, so that the sunlight enters the mirror surface from the east side, the sunlight from the front surface to the mirror surface at noon, and the afternoon from the afternoon. The sunlight incident on the mirror side of the west side is reflected to the solar vacuum heat collecting tube at the focus position. The drawbacks are:

[0004] The intensity of sunlight received by the condenser mirror during daytime varies greatly, from the weakest in the morning to the strongest at noon, and then gradually weakens to the weakest in the evening. This is detrimental to the stability of photothermal utilization, especially solar thermal power generation.

[0005] There are also precedents for two long mirror-slots to be placed in the north-south direction, and the condenser mirror is rotated in the east-west direction to track the sunlight. Although the summer mirror receives more solar radiation, the winter sun is southerly, so the mirror is accepted. The amount of solar radiation is small. Especially in the north, the angle of incidence of winter sunlight is very oblique, and the amount of solar radiation received by the mirror is small.

[0006] Current solar vacuum heat collecting tubes include an inner tube and an outer tube. The outer surface of the inner tube is coated with a heat absorbing film, and the outer tube is a transparent glass cover tube. The working tube temperature is up to several hundred degrees Celsius, while the outer tube is at ambient temperature. If both the inner and outer tubes are made of glass and the outer tube is welded at the ends of the two jaws, the expansion of the inner tube will cause the glass tube to rupture. Therefore, the all-glass solar vacuum heat collecting tube is made into a structure with one end opening.

[0007] The inner tube of the glass metal solar vacuum heat collecting tube at both ends of the mouth adopts a metal tube, and the metal tube is connected with a small metal bellows for buffering the displacement generated by the expansion of the inner tube. A glass and metal hot melt material is respectively used at the two ports to weld adjacent outer tubes and inner tubes to form a long solar vacuum heat collecting tube. [0008] The current trough parabolic concentrating tracking device has a large concentrating mirror area, and generally has a groove surface width of 3-8 meters, and two parallel groove sides are tens of meters to 100 meters long. In this case, only straight-through glass-metal solar vacuum heat collecting tubes with two ends of the mouth can be used for serial connection, wherein each tube is 3-6 meters long. The heat transfer medium (heat transfer oil) flows in from one end, and is heated to flow out from the other end. Due to the high requirements on the materials and processes of glass and metal hot-melt sealing due to the glass-metal solar vacuum heat collecting tubes at both ends, the domestic products are not technically relevant, and the foreign products are very expensive. This increases the production cost of the trough parabolic tracking concentrating device, and thus the trough parabolic tracking concentrating device has been available for decades but has not been effectively promoted.

[0009] A tower solar photovoltaic power generation device and a tower solar thermal power generation device mount a plurality of heliostats around a tower column. The strength of the pair of columns is very high, but the column does not fit too much heliostat. Since investment costs are difficult to recycle, they are less used.

technical problem

[0010] The technical problem to be solved by the present invention is that the slotted parabolic concentrating tracking device of the prior art cannot perform the omnidirectional tracking of the defects of sunlight, and provides a two-dimensional tracking solar concentrating device, which can perform sunlight on the light. Full tracking.

Problem solution

Technical solution

[0011] The technical solution adopted by the present invention to solve the technical problem thereof is: constructing a two-dimensional tracking solar concentrating device, comprising: a bracket;

[0012] an outer frame, mounted on a top of the bracket by a first bearing and rotatable relative to the bracket about an axis extending in the east-west direction;

[0013] a condensing mirror having a circular arc-shaped reflecting surface, mounted in the outer frame by a second bearing, and rotatable relative to the outer frame about an axis extending in a north-south direction; and a solar heat collecting tube fixed to the The focus position of the condenser.

[0014] According to the two-dimensional tracking solar concentrating device of the present invention, the solar heat collecting tube comprises a vacuum collecting tube with one end opening, one end closed, and a metal heat exchange tube disposed in the vacuum heat collecting tube; The two ends of the metal heat exchange tube are closed, and the heat transfer oil inlet pipe and the heat transfer oil outlet pipe are connected near the mouth end of the vacuum heat collecting pipe.

[0015] According to the two-dimensional tracking solar concentrating device of the present invention, the vacuum heat collecting tube includes a cover glass tube, And a heat absorbing glass tube disposed in the cover glass tube, wherein a vacuum is drawn between the cover glass tube and the heat absorbing glass tube; and an outer layer of the heat absorbing glass tube is coated with a heat absorbing film.

[0016] According to the two-dimensional tracking solar concentrating device of the present invention, the oil inlet pipe is interposed at the bottom of the metal heat exchange tube.

[0017] According to the two-dimensional tracking solar concentrating device of the present invention, the reflecting surface is located in a circular arc segment

The solar heat collecting tube is disposed on a symmetrical central axis OC of the reflecting surface; the circular arc segment

[number]

The center of the circle is 0, the radius is R, and the XOY plane rectangular coordinate system is established with the point 0 as the origin. The cross-sectional shape of the solar heat collecting tube is a circle 0', and an in-line isosceles right triangle DEF is made in the circle 0'. The vertex D of the isosceles right triangle DEF is located on the symmetry center axis OC and the Y axis of the condensing mirror 103, and faces the condensing mirror. The coordinates of the D point are (0, b), 0.47R ≤ b ≤ 0.98R.

[0018] According to the two-dimensional tracking solar concentrating device of the present invention, the cross-section of the solar heat collecting tube is an inverted isosceles triangle, and the solar heat collecting tube is made of metal; The outer tube wall of the symmetrical side faces the concentrating mirror and is affixed with single crystal silicon or polycrystalline silicon.

[0019] According to the two-dimensional tracking solar concentrating device of the present invention, the bracket includes a bottom support portion having a rectangular frame shape, and an end support portion symmetrically coupled to both ends of the bottom support portion in an east-west direction, The end support portion and the bottom support portion together form an isosceles triangle.

[0020] According to the two-dimensional tracking solar concentrating device of the present invention, the curved surface of the condensing mirror is a grooved arc surface or a grooved paraboloid, and includes a groove edge, and the groove edge extends along a north-south direction.

[0021] According to the two-dimensional tracking solar concentrating device of the present invention, a gap is left between the condensing mirror and the outer frame. Advantageous effects of the invention

Beneficial effect

[0022] The two-dimensional tracking solar concentrating device embodying the present invention has the following beneficial effects: With the same area of the condensing mirror, the solar illuminating device of the two-dimensional tracking solar concentrating device of the present invention receives one-day tracking solar energy. The concentrating device is 1.6 times, thus reducing the investment cost of solar energy utilization. On this basis, in order to collect the same energy, a smaller area of the concentrating mirror can be used, which has a shorter mirror length. In this way, a solar vacuum heat collecting tube with one end of the mouth can be used, and it is not necessary to use the solar heat collecting tubes with both ends of the mouth for docking. This drastically reduces production costs.

Brief description of the drawing

DRAWINGS

[0023] The present invention will be further described below in conjunction with the accompanying drawings and embodiments, in which:

1 is a schematic structural view of a two-dimensional tracking solar concentrating device according to a first embodiment of the present invention;

2 is a front elevational view of a stent in accordance with a first embodiment of the present invention;

3 is a cross-sectional view of a two-dimensional tracking solar concentrating device in accordance with a first embodiment of the present invention;

4 is a cross-sectional view of a solar heat collecting tube according to a first embodiment of the present invention;

5 is a light path diagram of a two-dimensional tracking solar concentrating device according to a first embodiment of the present invention;

6 is a light path diagram of a two-dimensional tracking solar concentrating device according to a second embodiment of the present invention;

7 is a light path diagram of a two-dimensional tracking solar concentrating device according to a third embodiment of the present invention.

BEST MODE FOR CARRYING OUT THE INVENTION

The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It is understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

1 is a schematic structural view of a two-dimensional tracking solar concentrating device 100 according to a first embodiment of the present invention.

Figure 2 is a front elevational view of a stent 101 in accordance with a first embodiment of the present invention. 3 is a side view of a two-dimensional tracking solar concentrating device 100 in accordance with a first embodiment of the present invention. As shown in FIG. 1-3, the two-dimensional tracking solar concentrating device 100 of the present invention comprises a bracket 101, an outer frame 102 mounted on the top of the bracket 101, and connected to the outer frame 1. A concentrating mirror 103 in 02, and a solar heat collecting tube 104 for collecting sunlight reflected by the condensing mirror 103

[0033] wherein the bracket 101 can be any suitable shape. In the illustrated embodiment, the bracket 101 includes a bottom support portion 101a having a substantially rectangular frame shape, and an end support portion 101b symmetrically coupled to both ends of the bottom support portion 101a in the east-west direction. The end support portion 101b and the bottom support portion 101a together form an isosceles triangle. Between the two end support portions 101b, there may be further provided a connecting portion 101c for connecting the middle portions of the two end support portions 101b to achieve a more stable structure.

The outer frame 102 is rotatably mounted on the top of the bracket 101 so as to be rotatable relative to the bracket 101 about an axis extending in the east-west direction. Specifically, on the top of the bracket 101, a pair of first bearings 105 are provided. The first bearing 105 may be disposed at the top of the end support portion 101b, respectively. The middle portions of the two long sides of the outer frame 102 are rotatably coupled to the top of the bracket 101 via the first bearing 105. Where the long side extends along the north-south direction

[0035] The reflecting surface of the condensing mirror 103 may be a grooved circular surface or a grooved paraboloid whose projection is rectangular in a direction perpendicular to the east and west and the north and south. The rectangle includes a long side and a short side, the long side is the groove side, and the short side is the projection of the curved end of the concentrating mirror. The groove edge extends toward the north-south direction. A reflective film is plated on the surface of the condensing mirror 103.

[0036] The reflecting surface of the condensing mirror 103 of the present invention is preferably a grooved arc surface. The concentrating mirror 103 of this shape has the following advantages: (1) a simple manufacturing process and low cost; (2) curvature of each point of the circular arc reflecting surface The radius is the same, the reflective surface is affected by the temperature during use, and the heat is increased and contracted. The stress at each point is the same without deformation. The trough parabola has the following disadvantages: (1) The curvature radius of each point of the reflecting surface is different, the manufacturing process is complicated and the cost is high; (2) The curvature radius of each point of the reflecting surface is different, and the temperature is affected by the heat during use. The temperature rises and contracts, the stress at each point is different, and it is easy to deform, which seriously affects the concentrating effect of the condensing mirror 103.

[0037] The condensing mirror 103 is rotatably mounted within the outer frame 102 and rotatable relative to the outer frame 102 about an axis extending in a north-south direction. Specifically, at the top of the outer frame 102, a pair of second bearings 106 are provided. The second bearings 106 may be disposed on top of the two short sides of the outer frame 102, respectively. The curved end of the condensing mirror 103 is rotatably coupled within the outer frame 102 by a second bearing 103. The long side and the short side of the condensing mirror 103 are shorter than the long side and the short side of the outer frame 102, respectively, and the long side and the short side of the condensing mirror 103 respectively and the long side of the adjacent outer frame 102, There is a gap between the short sides. Thus, the condensing mirror 103 can rotate in the outer frame 102 along an axis extending in the north-south direction without interfering with the outer frame 102. As is apparent from FIG. 3, the concentrating mirror 103 is disposed in the bracket 101, and its center of gravity is lowered, which can save the material of the bracket 101 and save cost.

[0038] The solar heat collecting tube 104 is fixed at a focus position of the condensing mirror 103 by a high temperature vacuum tube holder 107 to collect energy.

4 is a cross-sectional view of a solar heat collecting tube 104 according to a first embodiment of the present invention. As shown in Fig. 4, in the first embodiment of the present invention, the solar heat collecting tube 104 is a solar vacuum heat collecting tube. The solar vacuum heat collecting tube 104 includes a vacuum heat collecting tube 108 closed at one end, closed at one end, and a metal heat exchange tube 109 disposed in the vacuum heat collecting tube 108. The vacuum heat collecting tube 108 includes a cover glass tube 108a, and a heat absorbing glass tube 108b disposed in the cover glass tube 108a, and a vacuum is applied between the cover glass tube 108a and the heat absorbing glass tube 108b. On the outer layer of the endothermic glass tube 108b, a heat absorbing film is plated. Both ends of the metal heat exchange tube 109 are closed, and at a mouth end close to the vacuum heat collecting tube 108, the heat transfer oil inlet pipe 110 and the heat transfer oil outlet pipe 111 are connected. Preferably, the heat transfer oil inlet pipe 110 is inserted in the metal heat exchange tube 109 and extends to the bottom of the metal heat exchange tube 109.

[0040] The two-dimensional tracking solar concentrating device 100 further includes a pump for pumping the heat transfer oil to circulate it.

[0041] The solar vacuum heat collecting tube 104 is placed at the focus position of the condensing mirror 103, and the energy collected by the condensing mirror 103 is reflected to the solar vacuum heat collecting tube 104 and absorbed by the heat absorbing glass tube 108b. The energy absorbed by the endothermic glass tube 108b is transferred to the metal heat exchange tube 109. The heat transfer oil enters the metal heat exchange tube 109 through the heat transfer oil inlet pipe 110, and flows from the bottom of the metal heat exchange tube 109 to the heat transfer oil outlet pipe 111 at the nip end of the metal heat exchange tube 109, and finally from the heat transfer oil discharge pipe 111. Flow out. The heat transfer oil absorbs heat sufficiently in the metal heat exchange tube 109, and the temperature rises, and the heat can be further transmitted after flowing out.

[0042] Preferably, the mouth end of the solar vacuum heat collecting tube 104 faces south. This is because most of China's area is north of 23.5 degrees north latitude, and even if the sun goes from the south to the concentrating mirror 103, the south end is lower, which prevents rainwater from entering the interior of the solar vacuum heat collecting tube 104.

6 is a light path diagram of a two-dimensional tracking solar concentrating device 100 according to a second embodiment of the present invention. As shown in Fig. 6, in the second embodiment of the present invention, the solar heat collecting tube 104 is a light hot water tube having an inverted isosceles triangle in cross section and made of metal. The bottom edge of the isosceles triangle faces the sun, and the outer wall of the two symmetrical sides faces the concentrating mirror 103, and single crystal silicon or polysilicon 112 is pasted. The energy collected by the condensing mirror 103 is reflected onto the single crystal silicon or polysilicon 112, one for power generation and the other for heat. It can be transferred to the pipe wall and further transferred to the water in the light hot water pipe to heat the water and provide domestic hot water.

[0044] In the above first and second embodiments, the solar concentrating device 100 further includes a light sensor, and an axis for driving the outer frame 102 to rotate about the east-west axis and driving the condensing mirror 103 around the north-south direction. Rotating drive. The light sensor is electrically connected to the driving device so that the driving device can work according to the light sensed by the light sensor. This enables the solar concentrating device 100 to track the sunlight in the east-west direction during the day, and to track the sunlight in the north-south direction, so that the sunlight can always vertically illuminate the plane formed by the two groove sides of the condensing mirror 103. on. This solar concentrating device tends to stabilize the irradiance of sunlight received at various stages of the day. After actual testing, using the same area of the concentrating mirror 103, the two-dimensional tracking solar concentrating device 100 of the present invention receives 1.6 times the amount of solar radiation of the one-dimensional tracking solar concentrating device, thereby reducing the utilization of solar energy. cost of investment.

[0045] On this basis, in order to collect the same energy, a smaller area of the concentrating mirror 103 can be employed. Usually, an illuminating mirror of Im2-15m2 is used, and 10-20 concentrating devices are arranged in a row, driven by a driving device. Since the area of the condensing mirror 103 is small, the mirror length (that is, the length of the two groove sides) is short, usually 1-5 meters long, and the width between the two groove sides is also narrow, generally 0.5-3 meters. width. In this way, a solar vacuum heat collecting tube with one end opening can be used, and it is not necessary to use a glass frit solar collector tube with an expensive two-end opening for docking. The all-glass solar vacuum collector tube with one end of the mouth has been used in solar water heaters in China for 20 years, which greatly reduced the production cost.

5 is a light path diagram of a two-dimensional tracking solar concentrating device 100 according to a first embodiment of the present invention. As shown in FIG. 5, in this embodiment, the reflecting surface of the condensing mirror 103 is located on a circular arc segment.

[number]

On the AB, the solar collector tube 104 is disposed on the symmetrical central axis OC of the reflecting surface. Arc segment [number]

The center of the circle is 0 and the radius is R. The XOY plane rectangular coordinate system is established with the point 0 as the origin. Solar collector The cross-sectional shape of the tube 104 is a circle in which an isosceles right triangle DEF is formed, and the vertex D of the isosceles right triangle DEF is located on the symmetry center axis OC of the condensing mirror 103 and faces the condensing mirror 103. The coordinates of point D are (0, b). Point D is the intersection of the cross section of the solar heat collecting tube 104 and the Y axis. Preferably, point D is the intersection of the cross section of the heat absorbing glass tube 108b and the Y axis. The straight line equation is:

Y=-X+b where (0<b<R); (1)

[0048] From the formula (1), 0<X<R, 0<Y<R.

[0049] The incident ray is incident on the circular arc segment perpendicular to the chord GH

[Number], on. Wherein, the coordinates of the two ends of the string GH are G (Xg, Yg), H (- Xg, Yg), the reflection point is I, the coordinate is I (Xi, Yi), the normal is 01, and the reflection arc segment

[number]

The tangent at the reflection point I is a straight line J; the incident ray K is incident on the parallel Y-axis, and its linear equation is Xk=3⁄4, which is a straight line passing through the reflection point I parallel to the Y-axis. It is required that when the incident light-Xg<Xk< Xg吋, the reflected light irradiated on the circular arc can be focused on the DE and DF line segments, it can also be proved that the reflected light can be concentrated on the surface of the heat absorbing tube 2, and the convergence is satisfied. Light ratio requirements.

[0050] In order to achieve an ideal concentration ratio, the following conditions must be met: 0.47R≤b≤0.98R.

[0051] It has been experimentally proved that when b=0.47R吋, a concentrating ratio of about 10 times can still be achieved at the solar heat collecting tube 104. As b increases, the concentration ratio also increases. When b = 0.5 吋, the concentration ratio reaches a maximum of 150. When b = 0.51 吋, a concentrating ratio of about 100 times can be achieved. When b is further increased, the concentration ratio decreases rapidly. When b = 0.98 吋, the concentration ratio is 3.

When b is greater than 0.98 R 吋, the condensing ratio at the solar heat collecting tube 104 is significantly lowered. When b is less than 0.47 R 吋, the distance between the solar heat collecting tube 104 and the condensing mirror 103 is too long, and in order to maintain the overall balance, the bracket 101 needs to be made large. Several points where b is equal to 0.47, 0.5R, 0.8R, 0.9R吋 are shown in the figure. As can be seen from the figure, at 0.47R near 0.5R, the light can still be concentrated on the DE and DF segments, which can also be proved. The reflected light can be collected on the surface of the heat absorbing tube 2.

[0053] The optical path diagram shown in FIG. 5 is also applicable to the second embodiment shown in FIG. 6.

7 is a light path diagram of a two-dimensional tracking solar concentrating device according to a third embodiment of the present invention. This third embodiment is an improvement on the basis of the second embodiment, and the same points as those of the second embodiment will not be described again. As shown in Fig. 7, in the third embodiment, the solar heat collecting tube 104 is a light hot water pipe having a rectangular cross section and made of metal. The outer tube wall of the bottom side of the rectangle faces the condensing mirror 103, and single crystal silicon or polysilicon 112 is pasted. The energy collected by the condensing mirror 103 is reflected onto the single crystal silicon or polysilicon 112, one part is used for power generation, and the other part is converted into heat energy to the tube wall, and further transferred to the water in the light hot water tube to heat the water, providing Hot water for living. It has been experimentally proven that solar collector tubes 104 of this shape can also efficiently collect energy.

[0055] The two-dimensional tracking solar concentrating device 100 of the present invention can perform omnidirectional tracking of sunlight, and can adopt a solar vacuum heat collecting tube 104 with one end opening, thereby reducing the production cost.

The above description is only the preferred embodiment of the present invention, and is not intended to limit the present invention, and any modifications, equivalents, and improvements made within the spirit and scope of the present invention should be included in the present invention. Within the scope of protection of the invention.

Claims

Claim

[Claim 1] A two-dimensional tracking solar concentrating device, comprising: a bracket; an outer frame mounted on a top of the bracket by a first bearing and having an axis extending in an east-west direction relative to the a bracket rotating; a condensing mirror having a circular arc-shaped reflecting surface, mounted in the outer frame by a second bearing, and rotatable relative to the outer frame about an axis extending in a north-south direction; and a solar heat collecting tube fixed in the The focus position of the condenser.

[Claim 2] The two-dimensional tracking solar concentrating device according to claim 1, wherein the solar heat collecting tube comprises a vacuum collecting tube with one end opening, one end closed, and a vacuum collecting tube disposed in the vacuum collecting tube The metal heat exchange tube is closed at both ends of the metal heat exchange tube, and the heat transfer oil inlet pipe and the heat transfer oil outlet pipe are connected near the mouth end of the vacuum heat collecting tube.

[Claim 3] The two-dimensional tracking solar concentrating device according to claim 2, wherein the vacuum heat collecting tube comprises a cover glass tube, and a heat absorbing glass tube disposed in the cover glass tube, the cover glass Vacuuming between the tube and the endothermic glass tube; in the outer layer of the endothermic glass tube

, coated with a heat absorbing film.

[Claim 4] The two-dimensional tracking solar concentrating device according to claim 2, wherein the oil inlet pipe is inserted in the metal heat exchange tube and extends to a bottom of the metal heat exchange tube

[Claim 5] The two-dimensional tracking solar concentrating device according to claim 1, wherein the reflecting surface is located in a circular arc segment

AB, the solar heat collecting tube is disposed on a symmetrical central axis OC of the reflecting surface; the circular arc segment

The center of the circle is 0, the radius is R, and the XOY plane rectangular coordinate system is established with the point 0 as the origin. The cross-sectional shape of the solar heat collecting tube is a circle 0', and an isoscelial right angle is made in the circle 0'. a triangle DEF, the apex D of the isosceles right triangle DEF is located on the symmetry center axis OC and the Y axis of the condensing mirror 103, and faces the condensing mirror, the coordinates of the point D are (0, b), 0.47R ≤ b ≤ 0.98R .

[Claim 6] The two-dimensional tracking solar concentrating device according to claim 1, wherein the solar heat collecting tube has an inverted isosceles triangle in cross section, and the solar heat collecting tube is made of metal; The outer tube wall of the two symmetrical sides of the isosceles triangle faces the concentrating mirror, and is affixed with single crystal silicon or polycrystalline silicon.

[Claim 7] The two-dimensional tracking solar concentrating device according to claim 1, wherein the bracket includes a bottom support portion having a rectangular frame shape, and is symmetrically coupled to the bottom support portion in an east-west direction An end support portion at both ends, the end support portion and the bottom support portion together forming an isosceles triangle.

[Claim 8] The two-dimensional tracking solar concentrating device according to claim 1, wherein the curved surface of the condensing mirror is a grooved arc surface or a grooved paraboloid, and includes a groove edge, and the groove edge is along Extending from north to south.

[Claim 9] The two-dimensional tracking solar concentrating device according to claim 8, wherein a gap is left between the condensing mirror and the outer frame.

[Claim 10] The two-dimensional tracking solar concentrating device according to claim 1, wherein the solar concentrating device further comprises a light sensor, and an axis for driving the outer frame around the east-west direction a driving device that rotates and drives the condensing mirror to rotate about an axis in the north-south direction

[Claim 11] The two-dimensional tracking solar concentrating device according to claim 1, wherein the solar heat collecting tube has a rectangular cross section, and the solar heat collecting tube is made of metal; The outer tube wall of the bottom side faces the concentrating mirror, and is pasted with single crystal silicon or polycrystalline silicon