CN109253553B - Tower type Fresnel solar light-gathering and heat-collecting device - Google Patents

Tower type Fresnel solar light-gathering and heat-collecting device Download PDF

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Publication number
CN109253553B
CN109253553B CN201810903381.2A CN201810903381A CN109253553B CN 109253553 B CN109253553 B CN 109253553B CN 201810903381 A CN201810903381 A CN 201810903381A CN 109253553 B CN109253553 B CN 109253553B
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heat
tower
reflector
heat collecting
collecting device
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CN109253553A (en
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郭文礼
郭晔恒
孔瑞蕾
张欣尉
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Henan Hengju New Energy Equipment Co ltd
BEIJING HENGJU CHEMICAL GROUP CORP
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Henan Hengju New Energy Equipment Co ltd
BEIJING HENGJU CHEMICAL GROUP CORP
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
    • F24S23/00—Arrangements for concentrating solar-rays for solar heat collectors
    • F24S23/70—Arrangements for concentrating solar-rays for solar heat collectors with reflectors
    • F24S23/77—Arrangements for concentrating solar-rays for solar heat collectors with reflectors with flat reflective plates
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
    • F24S30/00—Arrangements for moving or orienting solar heat collector modules
    • F24S30/40—Arrangements for moving or orienting solar heat collector modules for rotary movement
    • F24S30/42—Arrangements for moving or orienting solar heat collector modules for rotary movement with only one rotation axis
    • F24S30/425—Horizontal axis
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
    • F24S23/00—Arrangements for concentrating solar-rays for solar heat collectors
    • F24S23/70—Arrangements for concentrating solar-rays for solar heat collectors with reflectors
    • F24S2023/87—Reflectors layout
    • F24S2023/872—Assemblies of spaced reflective elements on common support, e.g. Fresnel reflectors
    • 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
    • Y02E10/47—Mountings or tracking

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Thermal Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Optical Elements Other Than Lenses (AREA)

Abstract

The invention relates to the technical field of solar heat collection, and discloses a tower type Fresnel solar light-gathering and heat-collecting device which comprises at least one tower column, wherein each tower column comprises a plurality of longitudinally-arranged towers and a longitudinal beam for connecting two adjacent towers; a strip-shaped heat absorber is arranged on the longitudinal beam along the length direction of the longitudinal beam, and comprises a plurality of heat collecting pipes which are connected end to end; a reflector field is arranged below the heat collecting tube and used for reflecting solar rays to form surface focusing at the lower surface of the heat collecting tube. According to the invention, the height of the heating surface of the heat collecting tube is increased by utilizing the tower structure, so that the field area of the reflector which can be arranged is increased, the total area of the reflector is increased, and the light gathering ratio of the device is further improved. The high light concentration ratio can increase the surface temperature of the heat collecting pipe, so that the heat carrier in the heat collecting pipe can obtain more heat energy, the output thermal parameters are higher, and the application range is wider.

Description

Tower type Fresnel solar light-gathering and heat-collecting device
Technical Field
The invention relates to the technical field of solar heat collection, in particular to a tower type Fresnel solar light-gathering and heat-collecting device.
Background
In recent years, with continuous exploitation and utilization of people, fossil fuel resources such as coal, oil and natural gas are seriously in short supply, and meanwhile, the large-scale use of fossil fuel causes environmental pollution and ecological damage, thereby seriously harming human health. Therefore, the development and utilization of new energy sources become problems to be solved urgently at present. Solar energy is one of the most promising new energy sources at present, is inexhaustible, can be taken on site and does not need to be transported. And, unlike fossil fuels, the development and utilization of solar energy does not pollute the environment, which is a permanent clean energy source. Solar energy is also different from nuclear fuel, and does not produce radioactive waste leakage and pollute the environment. However, solar energy also has some disadvantages, such as the dispersion of solar energy. Although the total amount of solar radiation reaching the earth's surface is large, the solar energy density per unit area is low. Therefore, the solar light-gathering and heat-collecting device is produced by the way that the lower solar energy density on the unit area is gathered and converted into the higher energy density, so as to play a great role in solar energy.
At present, the solar light-gathering and heat-collecting device comprises: 1) a trough type light and heat gathering device; 2) a tower type light and heat gathering device; 3) a linear Fresnel type light-gathering and heat-collecting device; 4) butterfly spotlight heat collection device. The trough type light-gathering and heat-collecting device is more widely applied, and meanwhile, the tower type light-gathering and heat-collecting device is widely researched due to the characteristics of high light-gathering ratio and high power. However, the two light-gathering and heat-collecting devices have complicated structures, so that the investment and construction costs are high in the early stage, the operation and maintenance are difficult, the mirror surface tracking system is complicated, many parts depend on import, and the dependence on foreign technologies is difficult to get rid of in a short period. Therefore, the linear Fresnel light and heat collecting device is gradually developed on the basis of the groove type light and heat collecting device. The linear Fresnel solar light-gathering and heat-collecting device has the advantages of simple structure, low manufacturing cost, easy operation and maintenance, and simple and easy mirror surface tracking, the mirror surface reflection solar energy is emitted to the heat-collecting tube from bottom to top, and strong convection heat exchange exists in the heat-collecting tube, so that the heat-collecting tube is favorable for directly using water as a working medium to generate steam to drive a steam turbine to generate electricity. The operation and maintenance cost of the linear Fresnel light-gathering and heat-collecting device is far lower than that of a tower type or groove type light-gathering and heat-collecting device, and all components are easy to realize localization, so that the linear Fresnel light-gathering and heat-collecting device occupies a place in the market of solar light-gathering and heat-collecting devices in China. However, the linear fresnel concentrating and heat collecting device has a greatest disadvantage that the linear fresnel concentrating and heat collecting device follows the line focusing mode of the groove type concentrating and heat collecting device, and the concentrating ratio is far lower than that of the surface focusing mode of the tower type concentrating and heat collecting device. Theoretically, the maximum light concentration ratio of the groove type light concentration and heat collection device is 68.4, the maximum light concentration ratio of the tower type light concentration and heat collection device can reach 1000, and the light concentration ratio range of the linear Fresnel light concentration and heat collection device is only 50-100. Therefore, the solar energy density received by the heat collecting tube in the linear Fresnel light-gathering heat collecting device is low, and the temperature of the wall surface of the heat collecting tube is low, so that a high-temperature carrier working medium is difficult to obtain in the heat collecting tube, and the heat collecting efficiency is low.
Disclosure of Invention
Technical problem to be solved
The invention aims to provide a tower type Fresnel solar light-gathering and heat-collecting device, which aims to solve the problems of low light-gathering ratio and low heat-collecting efficiency of the conventional Fresnel solar light-gathering and heat-collecting device.
(II) technical scheme
In order to solve the technical problem, the invention provides a tower type Fresnel solar light-gathering and heat-collecting device, which comprises at least one tower column, wherein each tower column comprises a plurality of longitudinally arranged towers and a longitudinal beam for connecting two adjacent towers; a strip-shaped heat absorber is arranged on the longitudinal beam along the length direction of the longitudinal beam, and comprises a plurality of heat collecting pipes which are connected end to end; a reflector field is arranged below the heat collecting tube and used for reflecting solar rays to the lower surface of the heat collecting tube so as to form surface focusing at the lower surface of the heat collecting tube.
The tower frame is further provided with a fiber drawing tower, and the fiber drawing tower is connected with the longitudinal beam through longitudinal fiber drawing.
The number of the tower columns is multiple, and the tower columns are transversely arranged; the towers in two adjacent tower rows correspond to each other one by one, and the two adjacent towers which are transversely arranged are connected through a transverse beam; the fiber drawing tower is connected with the transverse beam through transverse fiber drawing; a plurality of said towers are connected by said longitudinal beams and said transverse beams to form a tower network.
Wherein the mirror field comprises a first mirror field and a second mirror field; the first reflector field is positioned on one side of the axis of the heat collecting pipe, and the second reflector field is positioned on the other side of the axis of the heat collecting pipe; the first reflector field and the second reflector field both comprise a plurality of reflector arrays, and each reflector array comprises a plurality of reflectors which are arranged side by side along the axis direction of the heat collecting tube.
Wherein an edge angle of the first mirror field is Qou1The edge angle of the second reflector field is Qou2(ii) a When the tower type Fresnel solar light-gathering heat-collecting device is positioned in the northern hemisphere, Q isou1Has a value range of 1-70 degrees and Qou2The value range of (1) to (60); when the tower type Fresnel solar light-gathering and heat-collecting device is positioned at the equator, Q isou1Is equal to Qou2And Q isou1And Qou2The value ranges of the two are all 1-70 degrees; when the tower type Fresnel solar light-gathering heat-collecting device is positioned in the southern hemisphere, Q isou1Has a value range of 1-60 DEG, Qou2The value range of (A) is 1-70 degrees.
The plurality of reflectors on the reflector array are rotatably connected to the same rotating shaft, and the plurality of reflector arrays correspond to the plurality of rotating shafts; and the rotating shafts are connected with the same automatic tracking adjusting mechanism, and the automatic tracking adjusting mechanism is used for linkage adjustment of the rotating shafts.
The automatic tracking adjusting mechanism comprises a driving unit, and the driving unit is at least connected with one rotating shaft; and a first driving wheel and a second driving wheel are arranged on the rotating shaft, the first driving wheel of the rotating shaft is connected with the first driving wheel of the rotating shaft on one adjacent side through a first driving belt, and the second driving wheel of the rotating shaft is connected with the second driving wheel of the rotating shaft on the other adjacent side through a second driving belt.
An expansion limit stop is arranged at one end, close to the strip-shaped heat absorber, of the longitudinal beam, and the other end of the strip-shaped heat absorber is connected with an expansion compensation pipe and used for directional expansion compensation of the strip-shaped heat absorber; the expansion compensation pipe is connected with the longitudinal beam through a support.
The cleaning device comprises a longitudinal beam, a heat collecting pipe surface cleaning mechanism and a cleaning device, wherein the cleaning device is connected to the longitudinal beam in a sliding mode, and the heat collecting pipe surface cleaning mechanism moves along the axis direction of the heat collecting pipe.
The heat collecting pipes are suspended on the longitudinal beam through heat collecting pipe hanging frames; the heat collecting pipe hanger is connected to the longitudinal beam in a sliding mode, and the heat collecting pipe hanger can move along the axis direction of the heat collecting pipe.
(III) advantageous effects
Compared with the prior art, the invention has the following advantages:
the invention provides a tower type Fresnel solar light-gathering and heat-collecting device which comprises at least one tower column, wherein each tower column comprises a plurality of longitudinally-arranged towers and a longitudinal beam for connecting two adjacent towers; a strip-shaped heat absorber is arranged on the longitudinal beam along the length direction of the longitudinal beam, and comprises a plurality of heat collecting pipes which are connected end to end; a reflector field is arranged below the heat collecting tube and used for reflecting solar rays to form surface focusing at the lower surface of the heat collecting tube. According to the invention, the height of the heating surface of the heat collecting tube is increased by utilizing the tower structure, so that the field area of the reflector which can be arranged is increased, the total area of the reflector is increased, and the light gathering ratio of the device is further improved. The high light concentration ratio can increase the surface temperature of the heat collecting pipe, so that the heat carrier in the heat collecting pipe can obtain more heat energy, the output thermal parameters are higher, and the application range is wider.
The invention also provides a plurality of transversely arranged tower columns, two adjacent transversely arranged tower columns are connected through the transverse beams, and the plurality of tower columns are connected through the longitudinal beams and the transverse beams to form a tower network, so that the wind resistance of the whole tower type Fresnel solar light-gathering and heat-collecting device is greatly improved. By utilizing the structure of the tower frame net, the heat collection capability is ensured, and the steel consumption of the device can be reduced. Meanwhile, the tower frames are arranged in a planning way, so that the utilization rate of the land is improved, and the operation of installation and maintenance personnel is facilitated.
Drawings
FIG. 1 is a front view of a tower-type Fresnel solar light-gathering and heat-collecting device in an embodiment of the invention;
FIG. 1A is an enlarged partial schematic view at R1 in FIG. 1;
FIG. 1B is an enlarged partial schematic view at R2 in FIG. 1;
FIG. 1C is an enlarged partial schematic view at R3 in FIG. 1;
FIG. 2 is a side view of the tower type Fresnel solar energy light and heat collecting device in FIG. 1 along the direction A-A;
FIG. 2A is an enlarged partial schematic view at R4 in FIG. 2;
FIG. 2B is an enlarged partial schematic view at R5 in FIG. 2;
FIG. 3 is a schematic diagram of an automatic tracking adjustment mechanism in an embodiment of the invention;
FIG. 4 is a schematic surface focusing principle diagram of the tower-type Fresnel solar light-gathering and heat-collecting device in the embodiment of the invention;
FIG. 5 is a schematic edge angle principle diagram of the tower-type Fresnel solar light-gathering and heat-collecting device in the embodiment of the invention;
description of reference numerals:
1: a tower; 2: a longitudinal beam; 21: a first lateral longitudinal beam;
22: a second side longitudinal beam; 3: a heat collecting pipe; 31: the upper surface of the heat collecting pipe;
32: the lower surface of the heat collecting pipe; 4: a first mirror field; 41: a first reflector;
411: a first mirror surface; 412 a first mirror rotation axis; 42: a first mirror support;
5: a second mirror field; 51: a second reflector; 52: a second mirror support;
6: drawing a fiber tower; 61: longitudinally drawing the fiber; 62: transversely drawing the fiber;
63: a fiber drawing and tensioning mechanism; 7: a transverse beam; 8: a collector tube suspension mechanism;
81: a heat collecting pipe hanger; 811: a collector tube hanger cross bar; 812: a heat collecting pipe hanger rod;
82: a chute; 821: a first chute; 822: a second chute;
9: an expansion limit stop; 10: an expansion compensation pipe; 11: a heat collecting pipe surface cleaning mechanism;
111: cleaning brushes; 112: cleaning the driving unit; 113: cleaning the track;
12: an automatic tracking adjustment mechanism; 121: a first drive pulley; 122: a second transmission wheel;
123: a first drive belt; 124: a second belt; 13: overhauling the channel;
14: a transverse connecting channel; 15: an engineering elevator for maintenance; 16: a complementary region for farming, fishery and pasturing;
17: incident solar rays; 18: reflected solar rays.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described below with reference to the accompanying drawings and specific embodiments. It is to be understood that the embodiments described are only a few embodiments of the invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "first", "second", and the like are used for the sake of clarity in describing the numbering of the product parts and do not represent any substantial difference. The terms "upper surface" and "lower surface" are used in accordance with conventional knowledge of the structure of the product. "preceding" and "succeeding" are described based on the arrangement order. The directions of the upper part, the lower part, the left part and the right part are all based on the directions shown in the attached drawings. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
It is to be understood that, unless otherwise expressly stated or limited, the term "coupled" is used in a generic sense as defined herein, e.g., fixedly attached or removably attached or integrally attached; may be directly connected or indirectly connected through an intermediate. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Fig. 1 is a front view of a tower-type fresnel solar light and heat collecting device in an embodiment of the invention, and fig. 2 is a side view of the tower-type fresnel solar light and heat collecting device in fig. 1 along a direction a-a. As shown in fig. 1 and fig. 2, the tower-type fresnel solar concentrating and heat collecting device provided by the embodiment of the invention includes at least one tower column, and the number of the tower columns may be one or multiple. The specific quantity can be comprehensively determined according to the energy requirement of the whole solar light-gathering and heat-collecting system and the available field area. The tower column comprises a plurality of towers 1 arranged longitudinally and a longitudinal beam 2 connecting two adjacent towers 1, and the longitudinal beam 2 can enhance the rigidity and the strength of the towers 1. In fig. 1, two towers 1 are taken as an example, and the left-right direction shown in fig. 1 is a longitudinal direction, and the left-right direction shown in fig. 2 is a lateral direction. Preferably, the east-west direction is a longitudinal direction and the north-south direction is a transverse direction when the geographic coordinate system is used as a reference. Specifically, the height of the tower 1 is generally over 100m, and the distance between two towers 1 in the longitudinal direction is equal to or greater than 150 m. The tower frame 1 and the longitudinal beam 2 are of truss structures and are formed by connecting a plurality of rod pieces, and the rod pieces can be welded or riveted. Preferably, the tower 1 and the longitudinal beams 2 are assembled in a bolted structure using a type steel material. The truss structure can fully play the role of materials, is reasonable in stress, saves materials and reduces the weight of the structure.
Meanwhile, the light transmittance of the tower can reach more than 90% due to the structural design of the truss, so that the shadow loss of solar energy is greatly reduced. Preferably, when the tower columns are arranged east-west, the tower 1 is rectangular in configuration, i.e. two plane girders are arranged in parallel and oppositely in east-west direction and two plane girders are arranged in parallel and oppositely in north-south direction, which together form a cubic frame. Specifically, in this rectangular tower 1, the length of the planar truss arranged in the east-west direction is the length, the length of the truss arranged in the north-south direction is the width, and the length of the tower is greater than the width. Preferably, the ratio of length to width is 4: 1. By establishing a model for the structure of the tower frame 1 and then simulating the movement law of the sun, the model of the tower frame 1 is irradiated with virtual sunlight at different angles, and the ratio of the shadow area generated on the reflector field to the light receiving area of the reflector field is the minimum in the tower frame 1 adopting the rectangular structure with the length-width ratio, so that the shadow loss caused by adopting the tower frame 1 is correspondingly the minimum.
A strip-shaped heat absorber is arranged on the longitudinal beam 2 along the length direction of the longitudinal beam 2 and comprises a plurality of heat collecting pipes 3 connected end to end. As shown in fig. 1A and 1C, the axis of the heat collecting tube 3 coincides with the length direction of the longitudinal beam 2. The distance between the two towers 1 in the longitudinal direction is large, the length of the longitudinal beam 2 is also large, and solar energy can be utilized to the maximum extent through a plurality of heat collecting pipes 3 which are connected end to end. Specifically, as shown in fig. 1C, two adjacent heat collecting tubes 3 are connected by a flange. A plurality of heat collecting pipes 3 which are connected end to end between two adjacent towers 1 which are longitudinally arranged form a strip-shaped heat absorber. The number of heat collecting pipes 3 contained in each strip-shaped heat absorber is usually about twenty. For example, the distance between every two longitudinally arranged towers 1 is 160m, the length required for arranging each heat collecting pipe 3 is 6.2m, the length here includes the length required for mounting a flange and the like, and each strip-shaped heat absorber includes twenty-five heat collecting pipes 3.
As shown in fig. 1 and 2, a reflector field is arranged below the heat collecting tube 3. The reflector field is used to reflect the solar rays to the lower surface of the collector tube 3 to form a surface focus at the collector tube lower surface 32. Preferably, the mirror field is arranged in a fresnel-like manner. As shown in fig. 4, the heat collecting tube 3 is an oval shaped heat collecting tube, and compared with a conventional heat collecting tube with the same cross-sectional area, the oval shaped heat collecting tube has a larger lower surface area, that is, a larger light receiving area.
During operation, incident solar rays 17 are reflected by the reflectors to become reflected solar rays 18, and the reflected solar rays 18 of the reflectors are gathered on the heating surface on the lower side of the heat collecting pipe 3 to form surface focusing. The linear focusing mode of the linear Fresnel solar light-gathering and heat-collecting device mainly focuses the reflected solar rays 18 on the axis of the conventional circular heat-collecting tube, while the surface focusing mode of the tower Fresnel solar light-gathering and heat-collecting device focuses the reflected solar rays 18 on the whole lower surface of the heat-collecting tube 3. Because the heat collecting pipes 3 have enough height and the reflecting mirrors of the reflecting mirror field also have enough quantity, the device can provide larger light condensation ratio while meeting the surface focusing mode.
During heat transfer, the reflected solar rays 18 heat the heated surface through heat radiation, and the heated surface heats up and then continues to transfer heat through the working medium on the other side of the wall surface. The heat collecting tube 3 receives light spots of a light gathering stroke on a heating surface, the wall temperature of the heating surface is raised in a radiation mode, when a heat carrier flows through the heat collecting tube 3, the inner surface of the heat collecting tube 3 transmits heat to the heat carrier from the wall surface in a heat conduction and convection heat transfer mode, so that the heat carrier obtains heat energy and finally enters an energy storage system as a high-temperature heat source. Specifically, the heated surface may be the entire tube wall of a special-shaped heat collecting tube, i.e., the lower surface 32 of the heat collecting tube. Further, the tube outer wall side of the heat collecting tube 3 is coated with a high temperature resistant selective absorbing coating. Further, measures for preventing heat loss by heat conduction and radiation heat dissipation can be taken for the heat collecting tube upper surface 31.
According to the tower-type Fresnel solar light-gathering and heat-collecting device provided by the embodiment, the height of the heating surface of the heat-collecting tube is increased by utilizing the tower structure, so that the field area of the reflector which can be arranged is increased, the total area of the reflector is increased, and the light-gathering ratio of the device is further improved. The high light concentration ratio can increase the surface temperature of the heat collecting pipe, so that the heat carrier in the heat collecting pipe can obtain more heat energy, the output thermal parameters are higher, and the application range is wider. Meanwhile, the tower structure has strong adaptability, lower construction cost and convenient operation and maintenance. The device changes the linear focusing mode of the linear Fresnel solar heat collecting device, creates a surface focusing mode with higher light condensation ratio, and provides technical reference for future solar light condensation and heat collection devices.
In order to better compare the light condensing capacity of the solar light condensing and heat collecting device, a concept of geometric light condensing ratio is introduced. The geometric concentration ratio is calculated as follows:
C＝(n×Am)/An
in the formula: n is the number of reflectors arranged below a single heat collecting tube;
Amis the area of a single mirror;
Anthe heat absorption area of a single heat collection pipe.
The light condensation ratio of the groove type solar light condensation and heat collection device is generally 50-150, the light condensation ratio of the linear Fresnel type solar light condensation and heat collection device is basically the same as that of the groove type device, and the temperature of a common heat carrier medium is difficult to break through 400 ℃ due to the fact that the light condensation ratio of the groove type solar light condensation and heat collection device is lower than that of the linear Fresnel type solar light condensation and heat collection device. The light condensation ratio of the tower type solar light and heat collecting device can reach 300-1000. The light condensation ratio of the tower type Fresnel solar light and heat collecting device in the embodiment is very close to that of the tower type solar light and heat collecting device, and can reach more than 600, and the temperature of the generated heat carrier medium is also higher. The surface temperature of the heat collecting tube of the tower type Fresnel solar light-gathering heat collecting device can reach 500-650 ℃, and the temperature of the heat collecting tube of the linear Fresnel solar light-gathering heat collecting device can only reach 300-400 ℃, so that the tower type Fresnel solar light-gathering heat collecting device provided by the invention integrates the advantages of the tower type heat collecting device and the linear Fresnel type heat collecting device, and has a very wide application prospect.
Further, as shown in fig. 1A, 1B and 2A, the thermal collecting tube 3 is suspended on the longitudinal beam 2 by a thermal collecting tube hanger 81, the thermal collecting tube hanger 81 is slidably connected to the longitudinal beam 2, and the thermal collecting tube hanger 81 moves along the axial direction of the thermal collecting tube 3. specifically, the thermal collecting tube hanger mechanism 8 includes a thermal collecting tube hanger 81 and an inverted L-shaped chute 82. as shown in fig. 2A, the chute 82 includes a first chute 821 and a second chute 822, the first chute 821 is mounted on the first longitudinal beam 21, the second chute 822 is mounted on the second longitudinal beam 22, the chute 82 and the longitudinal beam 2 may be bolted or welded, a left and a right two mutually parallel slideways are formed between the inverted L-shaped chute 82 and the longitudinal beam 2, the thermal collecting tube hanger 81 is installed in the slideways and slides in the axial direction of the thermal collecting tube 3, the thermal collecting tube hanger 81 includes a thermal collecting tube hanger 811 and a thermal collecting tube hanger boom 812, the thickness of the thermal collecting tube 811 is slightly smaller than the height of the cross bar 811, while the length of the cross bar 811 is greater than the distance between the cross bar 811, the cross bar 812, the hanger 812 is a hanger 812, the hanger can be a hanger 3, the hanger can be welded to the hanger 3, the hanger can be welded to a plurality of the hanger bar 812, the hanger 3, the hanger can be welded to the hanger bar 812, the hanger can be welded to the hanger 3, the hanger can be welded to the hanger bar 812, the hanger bar can be welded to the hanger bar can.
Further, the tower-type fresnel solar light-gathering and heat-collecting device in this embodiment further includes a heat collecting tube surface cleaning mechanism 11 slidably connected to the longitudinal beam 2, the heat collecting tube surface cleaning mechanism 11 includes a cleaning brush 111 and a cleaning driving unit 112, and the cleaning driving unit 112 can drive the cleaning brush 111 to rotate, and can also drive the cleaning brush 111 to advance. A cleaning track 113 is arranged on the longitudinal beam 2, so that the heat collecting tube surface cleaning mechanism 11 moves along the axial direction of the heat collecting tube 3. The photo-thermal conversion efficiency of the heat collecting tube 3 after cleaning is higher.
Further, the tower frame 1 is also provided with a fiber drawing tower 6, and the fiber drawing tower 6 is connected with the longitudinal beam 2 through a longitudinal drawing fiber 61. By utilizing the construction principle of the cable-stayed bridge and adopting the fiber pulling form, the bending moment in the longitudinal beam 2 can be reduced, the spanning capability of the longitudinal beam 2 is improved, and further the distance between two adjacent towers 1 can be increased, so that more heat collecting pipes 3 can be arranged on the longitudinal beam 2, and the heat collecting capability is further improved. Preferably, the longitudinal tow 61 may be a high strength, steel, fine diameter rope. Furthermore, a fiber tensioning mechanism 63 can be mounted on the longitudinal fiber 61 for adjusting the tightness of the fiber in time.
Further, as shown in fig. 2, when the number of the tower columns is plural, the plural tower columns are arranged laterally, taking the left-right direction in fig. 2 as the lateral direction. Preferably, the north-south direction is the lateral direction when referenced to the geographic coordinate system. The towers 1 in two adjacent tower columns are in one-to-one correspondence, that is, the number of the towers 1 in the two adjacent tower columns is the same, and when the tower columns are seen from left to right in fig. 2, only one tower column can be seen, and the rest of the tower columns are all located at the rear side of the tower column and are completely shielded by the tower column. Two adjacent towers 1 arranged transversely are connected through a transverse beam 7, namely the transverse beam 7 is connected between two towers in one-to-one correspondence in two adjacent tower columns, and the transverse beam 7 is perpendicular to the longitudinal beam 8. Similarly, the fiber drawing tower 6 is connected with the transverse beam 7 through a transverse drawing fiber 62. Preferably, the transverse tow 62 may be a high strength, steel, fine diameter rope. Furthermore, a fiber pulling tensioning mechanism 63 can be arranged on the transverse fiber pulling 62 for timely adjusting the tightness of the fiber pulling. Furthermore, the transverse beam 7 is also provided with a transverse connecting channel, which is beneficial for operators to move between the two tower columns.
In addition to the above-described embodiment, when the number of tower columns is plural, the number of towers 1 of adjacent two tower columns may also be different. The number of towers 1 in each tower row in particular can be determined according to the longitudinal length of the installable range of the device. The number of the towers 1 is planned according to the actual mountable area, so that the method is more reasonable and improves the utilization rate of the land.
The plurality of towers 1 are arranged longitudinally and transversely to form a tower group, any two adjacent towers 1 are connected with each other through the longitudinal beams and the transverse beams to form a tower net, and the wind resistance of the tower net of the tower type Fresnel solar light-gathering and heat-collecting device in the embodiment is greatly improved. In the case of land layout, the wind resistance can be designed to be about 10. In the case of an offshore arrangement, the wind resistance can be designed to be about 12 levels. Meanwhile, by utilizing the structure of the tower frame net, the heat collection capability is ensured, and the steel consumption of the device can be reduced.
Further, as shown in fig. 2, the reflector field includes a first reflector field 4 and a second reflector field 5, the first reflector field 4 is located at the left side of the axis of the heat collecting tube 3, and the second reflector field 5 is located at the right side of the axis of the heat collecting tube 3. Preferably, the mirror field is arranged in a north-south orientation, when referenced to a geographic coordinate system. As shown in fig. 2B, the first mirror field 4 and the second mirror field 5 each include a plurality of mirror columns including a plurality of mirrors arranged side by side along the axial direction of the heat collecting tube 3. Taking the first mirror field 4 as an example, a plurality of first mirrors 41 are arranged side by side on a first mirror support 42. Likewise, the plurality of second mirrors 51 are arranged side by side on the second mirror support 52. Preferably, the first reflector bracket and the second reflector bracket can be formed by welding a combination of section steels. The first reflector holder and the second reflector holder may also be of reinforced concrete construction or of other construction types. Specifically, the height of the first mirror support and the second mirror support may be 2.5m or more. Preferably, the height of the first mirror support and the second mirror support is 3 m. The lower space of the mirror support can be used as an operating area for the complementary farming, fishery and pasturing area 16 and also as a parking lot. Not only can improve the land utilization rate, but also can reduce the pollution of the ground dust to the mirror surface of the reflector.
Further, as shown in FIG. 5, to better characterize the arrangement of the mirror field, we introduce the concept of an edge angle, edge angle QouIs defined as follows: in the plane of fig. 5, the central point of the heat collecting tube 3 is defined as O, and the rotation center of a reflector at the edge of the reflector field is defined as OjThe vertical foot of the point O on the connecting line of the rotation centers of the mirrors in the mirror field is Oi，O-OjWith O-OiThe included angle between them is the edge angle Qou. H in FIG. 5iDefined as the hanging height of the collector tube 3, also called the optical height LiCharacterization data defined as the distance between the center of the outermost mirror and O-Oi, i.e., the mirror field width Li1Is OiAnd Oj1Distance between, Li2Is OiAnd Oj2The distance between them. Qou、hiAnd LiAnd a trigonometric function relation is satisfied, and another unknown quantity can be calculated according to any two known quantities.
In particular, the edge angle of the first mirror field 4 is Qou1The edge angle of the second reflector field 5 is Qou2. The leftmost mirror of the first mirror field 4 is a first mirror 41, the centre of rotation of which is Oj1The rightmost mirror of the second mirror field 5 is the second mirror 51, the center of rotation of which is Oj2. Preferably, the entire mirror field is arranged in a north-south direction, the first mirror field 4 being the north mirror field and the second mirror field 5 being the south mirror field. The influence of cosine factors is considered, so when the tower type Fresnel solar light-gathering and heat-collecting device is located in different latitude areas, the edge angles are selected differently. However, the distance between one mirror at the outermost edge of the mirror field and the O-Oi connection line cannot be more than three times the hanging height of the collector tube 3, i.e. the edge angle cannot be more than 70 °. If the edge angle is too large, the optical defocus increases, and the solar energy utilization efficiency is reduced. Meanwhile, as shown in fig. 2, the heat collecting tube 3 of the tower-type fresnel concentrating heat collecting device in this embodiment is installed in a hanging manner, and there is no shielding below the heat collecting tube 3, so that the innermost reflector of the mirror field can be as close to the position right below the heat collecting tube 3 as possible, that is, the included angle between the inner edge angle of the mirror field and the O-Oi connection line can be close to 0 °, and specifically, the distance from the innermost reflector to the base of the tower frame 1 is 0.8m to 1 m. Compared with a tower type light-gathering heat collecting device, the distance between the innermost reflector of the reflector field and the tower base is required to be larger than the tower height, and the tower type Fresnel solar light-gathering heat collecting device in the embodiment has no limitation, so that the land utilization rate is greatly improved, and the land area is saved. At the same time, higher soilThe utilization rate means that more reflectors can be arranged, the total area of the reflectors is increased, the focusing ratio is further increased, the temperature of a heat carrier can be increased, the heat carrying capacity of the device is increased, the solar energy utilization efficiency is improved, and high-efficiency and high-economical operation is realized.
Further, when the tower type Fresnel solar light-concentrating and heat-collecting device is near the equator, Q is selectedou1Is equal to Qou2I.e. the first mirror field 4 and the second mirror field 5 are symmetrically arranged with O-Oi as a boundary. Preferably, Qou1And Qou2The value ranges from 1 degree to 70 degrees. When the tower type Fresnel solar light-gathering and heat-collecting device is in the northern hemisphere, Q is selectedou1Greater than Qou2And as the latitude of the earth increases, Qou1Increase, Qou2The reduction, i.e. north mirror field arrangement, requires more mirrors than south mirror field arrangement. Preferably, Qou1Has a value range of 1-70 degrees and Qou2The value range of (A) is 1-60 degrees. When the tower type Fresnel solar light-gathering and heat-collecting device is in the southern hemisphere, Q is selectedou1Less than Qou2In this case, the mirrors in the south field are more than those in the north field. Preferably, Qou1Has a value range of 1-60 DEG, Qou2The value range of (A) is 1-70 degrees.
Furthermore, a plurality of reflectors on the reflector array are rotatably connected to the same rotating shaft, and the plurality of reflector arrays correspond to the plurality of rotating shafts. As shown in fig. 2B, the first reflector 41 includes a first reflector rotation axis 412 and a first reflector surface 411, and the first reflector surface 411 rotates around the first reflector rotation axis 412, and then tracks the incident solar ray 17 and accurately reflects the reflected solar ray 18 onto the lower surface 32 of the heat collecting tube. Preferably, the reflector fields of the tower-type fresnel solar concentrating and heat collecting device in this embodiment are arranged in the north-south direction, the first reflector field 4 is a north reflector field, and the second reflector field 5 is a south reflector field. The multi-surface reflectors on the same rotating shaft have the same zenith angle, so that the amplitude regulated by rotating the rotating shaft is the same. Meanwhile, although the zenith angles of the reflectors on the rotating shafts in the same reflector field are different, the rotating angle of each rotating shaft is the same in the process of adjusting the angle along with the incident light. Therefore, the plurality of rotating shafts are connected with the same automatic tracking adjusting mechanism, the plurality of rotating shafts can be adjusted in a linkage mode through the automatic tracking adjusting mechanism, the basic position of each reflector is adjusted initially, and the function of tracking the sun rays in a single-shaft one-dimensional mode can be achieved. Compared with a heliostat three-dimensional tracking system of a tower type light-gathering and heat-collecting device, the heliostat three-dimensional tracking system needs a double-shaft tracking adjusting device, and the initial construction investment is huge. The tower-type Fresnel solar light-gathering and heat-collecting device provided by the embodiment adopts a one-dimensional tracking system, has a simple structure and less investment, and is more beneficial to localization.
Further, as shown in fig. 3, the automatic tracking adjustment mechanism 12 includes a driving unit, which is connected to at least one rotating shaft, for example, a first mirror rotating shaft 412 in fig. 3. Any rotating shaft is provided with a first driving wheel 121 and a second driving wheel 122, the first driving wheel 121 of the first reflector rotating shaft 412 is connected with the first driving wheel of the adjacent rotating shaft on one side (the rotating shaft on the left side of the first reflector rotating shaft 412 in the figure) through a first driving belt 123, and the second driving wheel 122 of the first reflector rotating shaft 412 is connected with the second driving wheel of the adjacent rotating shaft on the other side (the rotating shaft on the right side of the first reflector rotating shaft 412 in the figure) through a second driving belt 124. Fig. 3 shows the situation of six rotating shafts, the rotating shafts are numbered from the first rotating shaft to the sixth rotating shaft from left to right, wherein the second driving wheel of the first rotating shaft is connected with the second driving wheel of the second rotating shaft, the first driving wheel of the second rotating shaft is connected with the first driving wheel of the third rotating shaft, the second driving wheel of the third rotating shaft is connected with the second driving wheel of the fourth rotating shaft, and the rest rotating shafts are analogized in the same way. Fig. 3 shows only a partial schematic view of the automatic tracking adjustment mechanism 12, and the number of actual rotating shafts needs to be determined according to design parameters. Specifically, the transmission wheel and the transmission belt can be connected through a chain, a belt or a gear. The diameter of the first drive wheel 121 in this embodiment is larger than the diameter of the second drive wheel 122. In addition to the above, the diameter of the first driving wheel 121 may be equal to or smaller than the diameter of the second driving wheel 122.
The present embodiment providesThe automatic tracking adjusting mechanism takes a rotating shaft connected with the driving unit as a central shaft, extends to two sides to be connected with a plurality of shafts, is driven by a transmission belt and is linked in a multi-shaft mode, and the rotating angles of the shafts are the same, so that the angle for adjusting and tracking the sun is also the same. For example, twenty heat collecting tubes 3 are arranged between two towers 1, and fifteen shafts are adopted to simultaneously connect with an automatic tracking adjusting mechanism 12, so that one automatic tracking adjusting mechanism 12 can simultaneously drive three-hundred-surface reflectors to track the sun, that is, one automatic tracking adjusting mechanism 12 can drive at least 1500m2Compared with a tower type light-gathering and heat-collecting device, the reflector saves nearly twenty times of the automatic tracking and adjusting mechanisms 12.
Furthermore, a mirror surface cleaning mechanism is arranged in the mirror field, the mechanism can continuously move back and forth in the mirror field along multiple axes in the mirror field, and both floating dust on the mirror surface and dry dust which is dried on the mirror surface can be cleaned by the mirror surface cleaning mechanism, so that the photothermal conversion efficiency of the mirror field is improved.
Further, as shown in fig. 1A and 1B, an expansion limit stopper 9 is provided on the longitudinal beam 2 at one end near the strip-shaped heat sink, the other end of the strip-shaped heat sink is connected with an expansion compensation pipe 10, and the expansion compensation pipe 10 is connected with the longitudinal beam 2 through a support. A compensation unit is arranged between every two towers 1, each compensation unit is provided with an expansion compensation pipe 10 at the head part and an expansion limit stop 9 at the tail part, so that the strip-shaped heat absorber expands only towards the direction of the expansion compensation pipe 10 after being heated and expanded, and the expansion amount is absorbed and compensated by the expansion compensation pipe 10. Meanwhile, the compensation units do not interfere with each other. The expansion compensating pipe 10 is arranged on the tower 1, either vertically or horizontally. When the expansion compensation pipe is vertically placed, the expansion compensation pipe 10 is hung on the tower frame 1; when the expansion compensation pipe 10 is horizontally placed, the expansion compensation pipe can be supported on the transverse beam 7, and the expansion compensation pipe is stable and reliable.
Further, still be provided with maintenance passageway 13 on longitudinal beam 2, do benefit to operating personnel and install and overhaul thermal-collecting tube 3 and thermal-collecting tube surface cleaning mechanism 11. Meanwhile, the tower frame 1 is also provided with an engineering elevator 15 for maintenance, so that a maintainer can conveniently get on and off the tower frame 1.
The following describes a tower-type fresnel concentrating and heat collecting device provided by the present invention according to a specific embodiment with reference to fig. 2 and fig. 5.
In this embodiment, the energy density of the solar energy received by the heat collecting tube 3 on the heating surface is required to reach 100kW/m2。
The geometric concentration ratio C is first calculated. Because a series of losses such as cosine loss, shadow and shielding loss, atmospheric attenuation loss, overflow loss, loss caused by poor mirror surface flatness, loss caused by mirror surface cleanliness and the like exist in the process of reflecting sunlight by the reflector, the energy of solar energy which can be received on the heating surface of the heat collecting tube 3 is only 25% of the energy of the incident solar energy of the reflector. Therefore, the incident solar energy obtained by the mirror field is required to be 400kW/m2. Because the difference between the incident solar energy and the weather conditions in different latitude areas is large, the energy received by the reflector per square meter is unequal, and the value range is 0.5kW/m2～1.2kW/m2. In this example, the value was taken to be 0.8kW/m2. The mirror area required in this embodiment is therefore 500m2. That is, in the present embodiment, 500m2The energy reflected by the reflector can enable the energy density of the solar energy received on the heating surface of the heat collecting tube 3 to reach 100kW/m2And the area of the heating surface of each heat collecting tube is set to be equal to the area of the mirror surface of a single reflector. Therefore, the geometric concentration ratio C of the tower-type fresnel concentrating and heat collecting device in this embodiment is 500.
And then designing a mirror field according to the requirements and the calculation result. In this embodiment, an elliptical heat collecting tube is taken as an example for explanation, the length of the heat collecting tube is 6m, the width of the long axis is 0.8m, and the height of the short axis is 0.2 m. The hanging height is 180m, the height of the fiber pulling tower is 30m, a longitudinal beam is arranged between the two towers, and the heat collecting pipes are hung on the longitudinal beam. The whole reflector field is arranged in the north-south direction, the reflectors are in strip shapes, the length of the reflector surface is 6m, and the width of the reflector surface is 0.8 m. Selecting a first mirror field edge angle Qou165 °, second mirror field edge angle Qou2Thus, the first mirror field width L is 50 °i1386m, second mirror fieldWidth Li2214.5 m. By simulating the calculation result of the sun movement rule, the mean distance of the reflector without shielding is 0.8 m. Thus, the first mirror field can be arranged with 321.7 mirrors, taking the integer 322, and the second mirror field can be arranged with 178.75 mirrors, taking the integer 179, for a total of 501 strip mirrors. Since the mirror surface area of a single reflector is the same as the heating surface area of the heat collecting pipe, the geometric concentration ratio C is 501. Thus, at 501m2The solar energy received on the reflector of (a) is 400.8kW/m2In consideration of the above-mentioned loss of solar energy, the photothermal conversion efficiency is 25%, so that the solar energy density irradiated on the surface of the heat collecting tube is 100kW/m2. Therefore, the tower-type Fresnel light-gathering heat-collecting device in the embodiment meets the design requirements.
According to the tower-type Fresnel solar light-gathering and heat-collecting device, the height of the heating surface of the heat-collecting tube is increased by utilizing the tower structure, so that the area of a reflector field which can be arranged is increased, the total area of the reflectors is increased, and the light-gathering ratio of the device is further increased. The high light concentration ratio can increase the surface temperature of the heat collecting pipe, so that the heat carrier in the heat collecting pipe can obtain more heat energy, the output thermal parameters are higher, and the application range is wider. Meanwhile, the tower structure has strong adaptability, lower construction cost and convenient operation and maintenance. Meanwhile, a farm, fishery and pasture complementary area or a parking lot can be arranged below the reflector field, and the land utilization rate is further improved. The device changes the linear focusing mode of the linear Fresnel solar heat collecting device, creates a surface focusing mode with higher light condensation ratio, and provides technical reference for future solar light condensation and heat collection devices.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims (9)

1. The tower type Fresnel solar light-gathering and heat-collecting device is characterized by comprising at least one tower column, wherein the tower column comprises a plurality of towers which are longitudinally arranged and a longitudinal beam which is used for connecting two adjacent towers; a strip-shaped heat absorber is arranged on the longitudinal beam along the length direction of the longitudinal beam, and comprises a plurality of heat collecting pipes which are connected end to end; the heat collecting pipes are suspended on the longitudinal beam through a heat collecting pipe hanging frame; the heat collecting pipe hanging bracket is connected to the longitudinal beam in a sliding mode and can move along the axis direction of the heat collecting pipe, so that the heat collecting pipe is heated and expanded along the axis direction, and the displacement of the heat collecting pipe in a vertical plane is limited; a reflector field is arranged below the heat collecting tube and used for reflecting solar rays to the lower surface of the heat collecting tube so as to form surface focusing at the lower surface of the heat collecting tube; the heat collecting pipe is an elliptical special-shaped heat collecting pipe.
2. The tower-type Fresnel solar light-concentrating and heat-collecting device according to claim 1, wherein a fiber-pulling tower is further arranged on the tower, and the fiber-pulling tower is connected with the longitudinal beam through longitudinal fiber-pulling.
3. The tower-type Fresnel solar light-concentrating and heat-collecting device according to claim 2, wherein the number of the tower columns is multiple, and the multiple tower columns are arranged transversely; the towers in two adjacent tower rows correspond to each other one by one, and the two adjacent towers which are transversely arranged are connected through a transverse beam; the fiber drawing tower is connected with the transverse beam through transverse fiber drawing; a plurality of said towers are connected by said longitudinal beams and said transverse beams to form a tower network.
4. The tower-type Fresnel solar light-concentrating heat-collecting device according to claim 1, wherein the reflector field comprises a first reflector field and a second reflector field; the first reflector field is positioned on one side of the axis of the heat collecting pipe, and the second reflector field is positioned on the other side of the axis of the heat collecting pipe;
the first reflector field and the second reflector field both comprise a plurality of reflector arrays, and each reflector array comprises a plurality of reflectors which are arranged side by side along the axis direction of the heat collecting tube.
5. The tower-type Fresnel solar light-concentrating and heat-collecting device according to claim 4, wherein the edge angle of the first reflector field is Qou1The edge angle of the second reflector field is Qou2(ii) a When the tower type Fresnel solar light-gathering heat-collecting device is positioned in the northern hemisphere, Q isou1Has a value range of 1-70 degrees and Qou2The value range of (1) to (60); when the tower type Fresnel solar light-gathering and heat-collecting device is positioned at the equator, Q isou1Is equal to Qou2And Q isou1And Qou2The value ranges of the two are all 1-70 degrees; when the tower type Fresnel solar light-gathering heat-collecting device is positioned in the southern hemisphere, Q isou1Has a value range of 1-60 DEG, Qou2The value range of (1) to (70);
wherein the edge angle QouIs defined as follows: defining the central point of the heat collecting tube as O, and the rotation center of a reflector at the edge of the reflector field as OjThe vertical foot of the point O on the connecting line of the rotation centers of the reflectors of the reflector field is Oi，O-OjWith O-OiThe included angle between them is the edge angle Qou。
6. The tower-type Fresnel solar light-concentrating and heat-collecting device according to claim 4, wherein the plurality of reflectors of the reflector array are rotatably connected to a same rotating shaft, and the plurality of reflector arrays correspond to the plurality of rotating shafts; and the rotating shafts are connected with the same automatic tracking adjusting mechanism, and the automatic tracking adjusting mechanism is used for linkage adjustment of the rotating shafts.
7. The tower-type Fresnel solar light-concentrating and heat-collecting device according to claim 6, wherein the automatic tracking and adjusting mechanism comprises a driving unit, and the driving unit is connected with at least one rotating shaft; and a first driving wheel and a second driving wheel are arranged on the rotating shaft, the first driving wheel of the rotating shaft is connected with the first driving wheel of the rotating shaft on one adjacent side through a first driving belt, and the second driving wheel of the rotating shaft is connected with the second driving wheel of the rotating shaft on the other adjacent side through a second driving belt.
8. The tower-type Fresnel solar light-gathering and heat-collecting device as claimed in claim 1, wherein an expansion limit stop is arranged at one end of the longitudinal beam close to the strip-shaped heat absorber, and the other end of the strip-shaped heat absorber is connected with an expansion compensation pipe for directional expansion compensation of the strip-shaped heat absorber; the expansion compensation pipe is connected with the longitudinal beam through a support.
9. The tower-type Fresnel solar light-gathering and heat-collecting device according to claim 1, further comprising a heat-collecting tube surface cleaning mechanism slidably connected to the longitudinal beam, wherein the heat-collecting tube surface cleaning mechanism moves along the axis direction of the heat-collecting tube.
CN201810903381.2A 2018-08-09 2018-08-09 Tower type Fresnel solar light-gathering and heat-collecting device Active CN109253553B (en)

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