Solar photovoltaic and thermal power generation system with self-flow on slope

Abstract

The embodiment of the application provides a kind of slope self-flow solar photothermal power generation system, including slope base, with first installation section, second installation section and inclined section, inclined section is between first installation section and second installation section, and inclined section has inclination angle;Mirror field is set on inclined section;Heat collecting pipe is located on the light axis of mirror field;Cold tank is set on second installation section, and the inlet end of heat collecting pipe is communicated by first pipeline, and cold tank is provided with the heat storage medium to be heated, and first pipeline is used to transmit heat storage medium into heat collecting pipe;Hot tank is set on first installation section, and the outlet end of heat collecting pipe is communicated;Power generation assembly is communicated with hot tank;Recycling pipe group is respectively communicated with power generation assembly and cold tank.Thereby, by setting mirror field on inclined section, heat storage medium is self-flowed in heat collecting pipe, compared with setting mirror field on ground, the incidence angle of sunlight can be increased, and the annual solar radiation received by mirror field is improved.

Description

Technical Field

[0001] This application relates to the field of solar concentrating and thermal collection technology, and in particular to a slope self-flowing solar thermal power generation system. Background Technology

[0002] With the increasing depletion of fossil fuels and the growing severity of climate change caused by greenhouse gas emissions, solar energy, as a clean and renewable energy source, has received widespread attention. Solar concentrators belong to the field of solar thermal energy collection technology, which collects and converts solar energy into thermal energy for use in power generation or providing thermal power.

[0003] Solar concentrators mainly consist of core components such as parabolic trough mirrors and collector tubes. The parabolic trough mirrors are responsible for focusing sunlight and reflecting it onto the collector tubes, which then absorb the focused solar radiation and convert it into heat energy.

[0004] However, in high-latitude regions, the solar altitude angle varies considerably with the seasons, resulting in poor light-gathering efficiency. Summary of the Invention

[0005] This application provides a slope self-flowing solar thermal power generation system to solve the problem of poor light concentration efficiency.

[0006] This application provides a hillside self-flowing solar thermal power generation system, including:

[0007] A sloping foundation platform, the sloping foundation platform having a first installation section, a second installation section and an inclined section, the inclined section being located between the first installation section and the second installation section, the inclined section having an inclined angle;

[0008] The mirror field is set on the inclined section;

[0009] A heat collection tube is located on the focusing axis of the mirror field to absorb sunlight reflected by the mirror field;

[0010] A cold tank is installed on the second installation section. The cold tank is connected to the inlet end of the heat collection tube through a first pipeline. The cold tank contains a heat storage medium to be heated. The first pipeline is used to transfer the heat storage medium into the heat collection tube.

[0011] A heat tank is installed on the first installation section and connected to the outlet end of the heat collection tube;

[0012] A power generation component is connected to the heat tank;

[0013] The recovery pipe assembly is connected to both the power generation component and the cold tank.

[0014] In one possible implementation, the hillside self-flowing solar thermal power generation system provided in this application embodiment further includes a second pipeline connected to the heat collection pipe and the cold tank respectively. The second pipeline is provided with a heating element and a first reflux valve. The heating element is used to heat the heat storage medium in the second pipeline, and the first reflux valve is used to control the opening and closing of the second pipeline.

[0015] In one possible implementation, the hillside self-flowing solar thermal power generation system provided in this application embodiment includes a first pipeline comprising a transmission section, an ascending section, and a descending section. The transmission section is located between the ascending section and the descending section. The two ends of the ascending section are respectively connected to the cold tank and the transmission section, and the descending section is respectively connected to the transmission section and the heat collection pipe.

[0016] In one possible implementation, the hillside self-flowing solar thermal power generation system provided in this application embodiment further includes a first circulation pump, which is disposed on the rising section.

[0017] In one possible implementation, the hillside self-flowing solar thermal power generation system provided in this application embodiment further includes a third pipeline, one end of which is connected to the heat collection pipe and the other end is connected to the heat tank, and the height of the end connected to the heat collection pipe is higher than that of the other end.

[0018] In one possible implementation, the hillside self-flowing solar thermal power generation system provided in this application embodiment further includes a fourth pipeline and a second return valve. The two ends of the fourth pipeline are respectively connected to the hot tank and the cold tank, and the second return valve is disposed on the fourth pipeline to control the opening and closing of the fourth pipeline.

[0019] In one possible implementation, the hillside self-flowing solar thermal power generation system provided in this application embodiment includes a recovery pipe group comprising a fifth pipe and a sixth pipe, the fifth pipe and the sixth pipe being connected, the other end of the fifth pipe being connected to the power generation component, the other end of the sixth pipe being connected to the cold tank, and the end of the fourth pipe not connected to the hot tank being connected to the sixth pipe.

[0020] In one possible implementation, the hillside self-flowing solar thermal power generation system provided in this application embodiment further includes a third return valve in the recovery pipe assembly. The third return valve is disposed on the fifth pipe to control the opening and closing of the fifth pipe.

[0021] In one possible implementation, the slope self-flowing solar thermal power generation system provided in this application embodiment has a sixth pipeline located within the inclined section, and the end of the sixth pipeline connected to the fifth pipeline is higher than the end of the sixth pipeline connected to the cold tank.

[0022] In one possible implementation, the slope self-flowing solar thermal power generation system provided in this application embodiment has an inclination angle of the inclined section between 7.84° and 67.85°.

[0023] The slope self-flowing solar thermal power generation system provided in this application includes a slope base, which has a first installation section, a second installation section, and an inclined section. The inclined section is located between the first and second installation sections and has an inclined angle. A mirror field is disposed on the inclined section. A collector tube is located on the concentrating axis of the mirror field to absorb the sunlight reflected by the mirror field. By disposing the mirror field on the inclined section, compared with disposing the mirror field on the ground, the incident angle of sunlight can be increased, thereby increasing the concentrating efficiency of the mirror field and improving the annual solar irradiance received by the mirror field.

[0024] Meanwhile, the hillside self-flowing solar thermal power generation system provided in this application embodiment also includes a cold tank, which is installed on the second installation section. The cold tank is connected to the inlet end of the collector tube through a first pipeline. The cold tank contains a heat storage medium to be heated. The first pipeline is used to transfer the heat storage medium into the collector tube. A hot tank is installed on the first installation section and connected to the outlet end of the collector tube. A power generation component is connected to the hot tank. A recovery pipe group is connected to the power generation component and the cold tank respectively. The heat storage medium in the cold pipe is transferred to the collector tube to absorb the energy reflected by the sunlight to complete the heating. Then it is transferred to the hot tank for storage. The heat storage medium is used to generate electricity by the power generation component. After the heat exchange is completed, the cooled heat storage medium is recovered by the recovery pipe group, thereby realizing the recycling of the heat storage medium and the efficient utilization of solar energy.

[0025] In addition to the technical problems solved by the embodiments of this application, the technical features constituting the technical solutions, and the beneficial effects brought about by the technical features of these technical solutions as described above, other technical problems that can be solved by the technical solutions provided by the embodiments of this application, other technical features contained in the technical solutions, and the beneficial effects brought about by these technical features will be further described in detail in the specific implementation. Attached Figure Description

[0026] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with those of this application and, together with the description, serve to explain the principles of the embodiments of this application.

[0027] Figure 1 A schematic diagram of the structure of a hillside self-flowing solar thermal power generation system provided in an embodiment of this application;

[0028] Figure 2 for Figure 1 Schematic diagram of the structure of the intercooler tank, the heat tank, and the heat collection tubes;

[0029] Figure 3 for Figure 1 Schematic diagram of the central mirror field and heat collection tubes;

[0030] Figure 4 for Figure 1 A schematic diagram of the inclined section.

[0031] Explanation of reference numerals in the attached figures:

[0032] 100 - Sloping foundation; 101 - First installation section; 102 - Second installation section; 103 - Inclined section;

[0033] 200-mirror field;

[0034] 300-Heat collector tube;

[0035] 400-Cold Can;

[0036] 500-Hot Can;

[0037] 600 - Power generation components; 601 - Heat exchanger; 602 - Seventh pipeline; 603 - Steam turbine; 604 - Condenser; 605 - Cooling tower;

[0038] 700 - Recovery pipe assembly; 701 - Fifth pipe; 702 - Sixth pipe; 703 - Third reflux valve;

[0039] 800 - First conduit; 801 - Rising section; 802 - Falling section; 803 - Transmission section;

[0040] 900 - Second pipeline;

[0041] 1000 - Third pipeline;

[0042] 1100 - Fourth Pipeline;

[0043] 1200 - First reflux valve;

[0044] 1300 - Heating element;

[0045] 1400 - Second reflux valve;

[0046] 1500 - First circulation pump;

[0047] 1600 - Second circulation pump.

[0048] The accompanying drawings illustrate specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the embodiments of this application in any way, but rather to illustrate the concepts of the embodiments of this application to those skilled in the art through reference to specific embodiments. Detailed Implementation

[0049] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the embodiments of this application.

[0050] In the embodiments of this application, the terms "upper," "lower," "inner," "middle," "outer," "front," and "rear," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are mainly for better describing the embodiments of this application and their implementations, and are not intended to limit the indicated device, element, or component to having a specific orientation, or to be constructed and operated in a specific orientation. Furthermore, some of the above terms may be used to indicate other meanings besides orientation or positional relationship; for example, the term "upper" may also be used in some cases to indicate a certain dependency or connection relationship. For those skilled in the art, the specific meaning of these terms in the embodiments of this application can be understood according to the specific circumstances.

[0051] Furthermore, the terms "set up," "connect," and "fix" should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this disclosure according to the specific circumstances.

[0052] The terms "first," "second," "third," "fourth," etc. (if present) in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that embodiments of the present application described herein can be implemented, for example, in orders other than those illustrated or described herein.

[0053] In this application, the terms "exemplarily" or "for example" are used to indicate examples, illustrations, or descriptions. Any embodiment or design described as "exemplarily" or "for example" in this application should not be construed as being more preferred or advantageous than other embodiments or designs. Specifically, the use of terms such as "exemplarily" or "for example" is intended to present the relevant concepts in a specific manner.

[0054] Unless otherwise stated, the term "multiple" means two or more.

[0055] As described in the background section, with the gradual depletion of fossil fuels and the increasing environmental impact of greenhouse gas emissions, solar energy, as a clean and renewable energy source, has attracted much attention for its utilization technology. Solar concentrators are an important component of solar energy utilization technology. Their working principle involves using specific optical designs, such as parabolic trough mirrors, to concentrate and reflect sunlight onto the collector tubes, enabling the collector tubes to efficiently absorb and convert it into heat energy.

[0056] However, in higher latitude regions, the solar altitude angle varies significantly with the seasons due to the tilt of the Earth's axis of rotation and changes in its orbit. This variation directly impacts the concentration efficiency and energy harvesting of solar concentrators. During seasons with lower solar altitude angles, concentrators may be unable to effectively focus sunlight onto the collector tubes, resulting in lower energy conversion efficiency and total energy output.

[0057] To address the aforementioned problems, this application provides a slope self-flowing solar thermal power generation system, including a slope base with a first installation section, a second installation section, and an inclined section. The inclined section is located between the first and second installation sections and has an inclination angle. A mirror field is disposed on the inclined section. A collector tube is located on the concentrating axis of the mirror field to absorb sunlight reflected by the mirror field. Therefore, by placing the mirror field on the inclined section, compared to placing it on the ground, the incident angle of sunlight can be increased, thereby increasing the concentrating efficiency of the mirror field and improving the annual solar irradiance received by the mirror field.

[0058] Meanwhile, the hillside self-flowing solar thermal power generation system provided in this application embodiment also includes a cold tank, which is installed on the second installation section. The cold tank is connected to the inlet end of the collector tube through a first pipeline. The cold tank contains a heat storage medium to be heated. The first pipeline is used to transfer the heat storage medium into the collector tube. A hot tank is installed on the first installation section and connected to the outlet end of the collector tube. A power generation component is connected to the hot tank. A recovery pipe group is connected to the power generation component and the cold tank respectively. The heat storage medium in the cold pipe is transferred to the collector tube to absorb the energy reflected by the sunlight to complete the heating. Then it is transferred to the hot tank for storage. The heat storage medium is used to generate electricity by the power generation component. After the heat exchange is completed, the cooled heat storage medium is recovered by the recovery pipe group, thereby realizing the recycling of the heat storage medium and the efficient utilization of solar energy.

[0059] The technical solutions of the embodiments of this application and how the technical solutions of the embodiments of this application solve the above-mentioned technical problems are described in detail below with specific examples. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments. The embodiments of the present application will be described below with reference to the accompanying drawings.

[0060] Please refer to Figures 1 to 4 This application provides a slope self-flowing solar thermal power generation system, including a slope base 100, which has a first mounting section 101, a second mounting section 102, and an inclined section 103. The inclined section 103 is located between the first mounting section 101 and the second mounting section 102 and has an inclined angle; a mirror field 200 is disposed on the inclined section 103; a heat collection tube 300 is located on the concentrating axis of the mirror field 200 to absorb the sunlight reflected by the mirror field 200; and a cold tank 40. 0, installed on the second installation section 102, the cold tank 400 is connected to the inlet end of the heat collector tube 300 through the first pipeline 800, the cold tank 400 is filled with the heat storage medium to be heated, and the first pipeline 800 is used to transfer the heat storage medium into the heat collector tube 300; the hot tank 500 is installed on the first installation section 101 and is connected to the outlet end of the heat collector tube 300; the power generation component 600 is connected to the hot tank 500; the recovery pipe group 700 is connected to the power generation component 600 and the cold tank 400 respectively.

[0061] Specifically, in this embodiment, the slope base 100 has an inclined section 103 with an inclined angle. The mirror field 200 is installed on the inclined section 103, thereby increasing the incident angle of sunlight compared to setting the mirror field 200 on the ground, which in turn increases the light-gathering efficiency of the mirror field 200 and improves the annual solar irradiance received by the mirror field 200.

[0062] Specifically, due to the different latitudes of various regions, the solar altitude angle varies. In high-latitude regions, the range of movement of the sun's direct point within a year is larger, resulting in greater variations in the solar altitude angle. This embodiment uses a high-latitude region as an example to further explain the calculation method for the tilt angle range of the tilt segment 103 provided in this embodiment.

[0063] First, obtain the longitude range of the applicable area for the slope self-flowing solar thermal power generation system provided in this embodiment, and calculate the local time angle according to formula (I).

[0064] h=15×[(t+Λ-120°) / 15°]-12 Formula (I)

[0065] Where h is the local time angle, t is the calculation time, Λ is the longitude of the construction site, 15° is the time angle corresponding to the Earth's rotation, 12 is the true solar time 12 o'clock, 120° is the longitude of the Purple Mountain Observatory, and Beijing time is measured by the Purple Mountain Observatory.

[0066] Due to the Earth's rotation, the position of the sun appears different at the same time in different longitude regions. In order to accurately calculate the solar altitude angle, it is necessary to calculate the local time angle based on the longitude range of the applicable region in this embodiment, so as to confirm the position range of the sun in the applicable region.

[0067] Meanwhile, since noon is the extreme position of the sun's altitude in a day, this embodiment uses noon for calculation, that is, 12 noon, at which time t = 12.

[0068] It should be noted that the slope self-flowing solar thermal power generation system provided in this embodiment is applicable to areas with a longitude range of 100° to 135°, where Λ includes Λ max and Λ min Λ min =100°, which is the easternmost longitude of the applicable region, Λ max =135°, which is the westernmost longitude of the applicable region.

[0069] Λ max and Λ min Substituting into formula (1), we can obtain the local time angle h corresponding to the applicable region, where h includes hi. max and h min h max h is the maximum local time angle. min It is the smallest local time angle.

[0070] Based on the above calculations, h is obtained. max =183,h min =148.

[0071] Secondly, the local declination of the summer solstice and winter solstice are calculated according to formula (II).

[0072]

[0073] Where N is the accumulated day, δ is the local declination, and 23.44° is the highest degree of solar declination.

[0074] Since the sun's direct rays reach the Tropic of Cancer and the Tropic of Capricorn on the summer and winter solstices respectively, representing the northernmost and southernmost extreme positions the sun can reach in a year, they can represent the extreme cases of the sun's position relative to the Earth's equator. Therefore, it is necessary to calculate the local declination on the summer and winter solstices respectively.

[0075] Where N includes N1 and N2. N1 is the accumulated day of the summer solstice, which is June 22nd in the calendar, the 173rd day of the year (non-leap year). Therefore, N1 = 173. N2 is the accumulated day of the winter solstice, which is December 22nd in the calendar, the 356th day of the year (non-leap year). Therefore, N2 = 356.

[0076] Substituting N1 and N2 into formula (II) respectively, we obtain the local declination on the summer solstice and the winter solstice. δ includes δ1 and δ2, where δ1 is the local declination on the summer solstice and δ2 is the local declination on the winter solstice.

[0077] Based on the above calculations, we obtain δ1 = 22.9° and δ2 = -23.44°.

[0078] After obtaining the local declination and local time angle, the longitude range of the applicable area is obtained, and the solar altitude angle of the construction site on the summer solstice and winter solstice is calculated according to formula (III).

[0079] θ s =arcsin(cosh×cosδ×cosφ+sinδ×sinφ) Formula (III)

[0080] Where, θ s φ is the solar altitude angle, h is the local time angle, δ is the local declination, and φ is the longitude of the applicable region.

[0081] δ includes δ1 and δ2, where δ1 is the local declination on the summer solstice and δ2 is the local declination on the winter solstice.

[0082] It should be noted that the latitude range of the slope self-flowing solar thermal power generation system provided in this embodiment is 20° to 55°, φ including φ max and φ min , φ max =55°, which is the northernmost area of ​​the applicable region, φ min =20°, which is the southernmost region of the applicable area.

[0083] θs includes θ s，max，summer and θ s，min，summer The local declination δ1 on the summer solstice and the maximum local time angle h max and the southernmost latitude φ of the applicable region min Substituting into formula (iii), we obtain the maximum solar angle θ at noon on the summer solstice in the applicable region. s，max，summer ; Combine the local declination δ1 of the summer solstice with the minimum local time angle h min And the northernmost latitude φ of the applicable region max Substituting into formula (III), we obtain the minimum solar altitude angle θ at noon on the summer solstice for the applicable region. s，min，summer .

[0084] Based on the above calculations, θ is obtained. s，max，summer = 82.16°, θ s，min，summer =63.71°.

[0085] θs also includes θ s，max，winter and θ s，min，winter The local declination δ2 on the winter solstice and the maximum local time angle h max and the southernmost latitude φ of the applicable region min Substituting into formula (iii), we obtain the maximum solar angle θ at noon on the winter solstice in the applicable region. s，max，winter ; Combine the local declination δ2 on the winter solstice with the minimum local time angle h min And the northernmost latitude φ of the applicable region max Substituting into formula (III), we obtain the minimum solar altitude angle θ at noon on the winter solstice for the applicable region. s，min，winter .

[0086] Based on the above calculations, θ is obtained. s，max，winter = 40.07°, θ s，min，winter =22.15°.

[0087] Based on the above calculations, the annual solar altitude angle variation range of the applicable area for the slope self-flowing solar thermal power generation system provided in this embodiment is 22.15° to 82.16°.

[0088] After obtaining the solar altitude angle, the slope range of inclined segment 103 is calculated according to formula (iv).

[0089] β=θ s ′-θ s Formula (IV)

[0090] Where β is the inclination angle of inclined segment 103, and θ s ' is the ideal angle of incidence, θ s This is the solar altitude angle.

[0091] Specifically, the incident angle of sunlight directly affects the amount of solar radiation that the mirror field 200 can receive. When the incident angle is 90 degrees, the amount of solar radiation received by the mirror field 200 is the maximum. At this time, the sunlight coincides with the normal of the mirror surface, and the solar radiation can hit the mirror surface completely perpendicularly. Therefore, in this embodiment, the ideal incident angle θ is... s ′ is 90°.

[0092] The minimum solar altitude angle θ at noon on the winter solstice s，min，winter And the maximum solar angle θ at noon on the summer solstice s，max，summerSubstituting these values ​​into formula (iv) yields the optimal slope for achieving the ideal incident angle on the summer solstice and winter solstice, thus determining the range of the tilt angle of the tilt segment 103.

[0093] Based on the above calculations, the angle range of β is 7.84° to 67.85°.

[0094] However, in actual construction, if the tilt angle of the inclined section 103 is too large, it will be detrimental to the installation and maintenance of the mirror field 200. An excessively large tilt angle will greatly increase the inconvenience and risk to the construction personnel. At the same time, more fixing and support measures are required to ensure that the mirror field 200 can be stably fixed on the inclined surface, thereby increasing the complexity and cost of construction.

[0095] Therefore, considering actual construction factors, this embodiment further limits the tilt angle of the inclined section 103 to between 7.84° and 30°.

[0096] Specifically, after obtaining the tilt angle range of the tilt segment 103, the solar irradiance received by the mirror field 200 per unit time is calculated according to formulas (V), (VI) and (VII).

[0097] B = 2π(N) day -1) / 365 Formula (Part 5)

[0098] I0 = I sc ×(1.00011+0.034221cosB+0.00128sinB+0.000719cos2B+

[0099] Formula (VI) for 0.000077sin2B

[0100]

[0101] Where B is the intermediate calculation angle, and N day The numerical values ​​corresponding to dates starting with January 1st of the year, I0 is the irradiance of sunlight incident perpendicularly at the upper boundary of the atmosphere, and θ′ is the value corresponding to the date of the year starting with January 1st. s To introduce the incident angle of the grooved mirror with an installation slope, I sc =1367W·m -2 denoted as the solar constant, DNI as the solar irradiance received by the trough mirror per unit time, and β as the tilt angle of the tilted segment 103.

[0102] The solar irradiance received by the trough mirror per unit time is obtained, and the optimal tilt angle is calculated according to formulas (viii) and (ix).

[0103]

[0104] Where, θ′s To introduce the incident angle of the trough mirror with the installation slope, DNI is the amount of solar irradiance received by the trough mirror per unit time, β is the tilt angle of the tilt section 103, and 0.33 is a coefficient related to atmospheric transparency. When it is a good sunny day, this coefficient can be 0.33.

[0105] The extreme values ​​of the tilt angle are calculated according to formulas (viii) and (ix). At this tilt angle, the annual solar irradiance received by mirror field 200 is maximized.

[0106] By adopting the above technical solution, the mirror field 200 is set on the inclined section 103, so that the incident angle of the sun can reach the ideal angle, ensuring that the solar radiation received by the mirror field 200 is maximized throughout the year.

[0107] Meanwhile, the hillside self-flowing solar thermal power generation system provided in this embodiment also includes a collector tube 300, a cold tank 400, a hot tank 500, a power generation module 600, and a recovery pipe assembly 700. The collector tube 300 is located on the concentrating axis of the mirror field 200 to absorb sunlight reflected by the mirror field 200. The cold tank 400 contains a heat storage medium and is connected to the collector tube 300 via a first pipe 800. The heat storage medium enters the collector tube 300 from the cold tank 400 through the first pipe 800 to absorb solar radiation and heat up, then enters the hot tank 500. The power generation module 600 is connected to the hot tank 500 and generates electricity by exchanging heat with the high-temperature heat storage medium in the hot tank 500. The recovery pipe assembly 700 is connected to both the power generation module 600 and the cold tank 400 to recover the cooled heat storage medium after heat exchange back into the cold tank 400 for reuse.

[0108] The slope self-flowing solar thermal power generation system provided in this embodiment increases the incident angle of sunlight by placing the mirror field 200 on the inclined section 103, compared to placing the mirror field 200 on the ground. This increases the concentrating efficiency of the mirror field 200 and improves the annual solar irradiance received by the mirror field 200. By setting up the heat collection tube 300, cold tank 400, hot tank 500, power generation component 600, and recovery pipe assembly 700, the system ensures the recycling of solar energy and achieves efficient utilization and conversion of solar energy.

[0109] Furthermore, since the heat collection tube 300 is located on the focusing axis of the mirror field 200, and the mirror field 200 is set on the inclined section 103 with an inclined angle, the heat collection tube 300 has an inclined angle, and the heat storage medium can flow autonomously in the heat collection tube 300 without the need to install a circulation pump on the heat collection tube 300, thereby saving production costs.

[0110] It should also be noted that the mirror field 200 provided in this embodiment is composed of multiple mirrors. Optionally, the mirror surface can be rotated on a single axis to track the changing position of the sun throughout the day, thereby ensuring that the amount of solar irradiance received by the mirror field 200 is maximized throughout the day.

[0111] The single-axis rotation of the reflector is existing technology and will not be explained further in this embodiment.

[0112] In an optional embodiment, the hillside gravity-flow solar thermal power generation system further includes a second pipeline 900 connected to the collector pipe 300 and the cold tank 400 respectively. The second pipeline 900 is provided with a heating element 1300 and a first reflux valve 1200. The heating element 1300 is used to heat the heat storage medium in the second pipeline 900, and the first reflux valve 1200 is used to control the opening and closing of the second pipeline 900.

[0113] Specifically, in this embodiment, the second pipeline 900 is connected to both the collector pipe 300 and the cold tank 400. The second pipeline 900 is equipped with a heating element 1300 and a first reflux valve 1200. At night or in other lightless environments, the mirror field 200 cannot reflect sunlight to heat the heat storage medium inside the collector pipe 300, resulting in insufficient temperature for power generation. However, if this portion of the heat storage medium is left in the collector pipe 300 for an extended period to await reheating under sunlight, the medium's low temperature will cause condensation, blocking the collector pipe 300. In this case, by opening the first reflux valve 1200, the second pipeline 900 is connected to both the collector pipe 300 and the cold tank 400, allowing the heat storage medium in the collector pipe 300 to be recovered and stored in the cold tank 400, thus preventing heat waste and condensation blockage.

[0114] Meanwhile, it should be noted that in this embodiment, the height of the first installation section 101 is higher than that of the second installation section 102. Since the mirror field 200 provided in this embodiment is set on the inclined section 103, the end of the second pipeline 900 connected to the heat collection pipe 300 is higher than the end of the second pipeline 900 connected to the cold tank 400. This allows the heat storage medium in the heat collection pipe 300 to flow into the cold tank 400 through the second pipeline 900 under its own gravity, eliminating the need for a circulation pump and saving production costs.

[0115] In this embodiment, the heating element 1300 is a heat tracing cable. When the heat storage medium in the heat collection pipe 300 has poor fluidity due to its own low temperature, the heat tracing cable is turned on to heat the heat storage medium to ensure the smooth flow of the heat storage medium.

[0116] In other embodiments, the heating element 1300 may also be other structures capable of heating the heat storage medium, and this embodiment does not impose any limitations on this.

[0117] In an optional embodiment, the first pipeline 800 includes a transmission section 803, an ascending section 801, and a descending section 802. The transmission section 803 is located between the ascending section 801 and the descending section 802. The two ends of the ascending section 801 are connected to the cold tank 400 and the transmission section 803, respectively. The descending section 802 is connected to the transmission section 803 and the heat collection pipe 300, respectively.

[0118] Specifically, in this embodiment, the first pipeline 800 includes a transmission section 803, an ascending section 801, and a descending section 802. The two ends of the ascending section 801 are connected to the cold tank 400 and the transmission section 803, respectively. The descending section 802 is connected to the transmission section 803 and the heat collector pipe 300, respectively. The connection end of the descending section 802 and the heat collector pipe 300 is lower than the connection end of the descending section 802 and the transmission section 803, so that the heat storage medium in the cold tank 400 flows into the transmission section 803 through the ascending section 801, and then flows into the heat collector pipe 300 through the descending section 802. At this time, since the heat storage medium in the descending section 802 flows from high to low, the potential energy of the heat storage medium is converted into kinetic energy, thereby realizing the gravity flow of the heat storage medium in the heat collector pipe 300.

[0119] It should also be noted that a control valve can be adaptively installed on the descending section 802 according to actual needs to control the flow rate and volume of the heat storage medium. This embodiment does not impose any restrictions on this.

[0120] In an optional embodiment, the hillside gravity-flow solar thermal power generation system further includes a first circulation pump 1500, which is disposed on the riser section 801.

[0121] Specifically, in this embodiment, the first circulation pump 1500 is installed on the rising section 801 to pump the heat storage medium in the cold tank 400 into the rising section 801, thereby providing power for the flow of the heat storage medium and ensuring that the heat storage medium can flow smoothly along the rising section 801. At the same time, by setting the first circulation pump 1500, not only can the continuity of the heat storage medium flow be guaranteed, but also the flow rate and velocity of the heat storage medium can be precisely controlled, thereby achieving stable control of the system.

[0122] In an optional embodiment, the hillside gravity-flow solar thermal power generation system further includes a third pipeline 1000, one end of which is connected to the collector pipe 300 and the other end of which is connected to the heat tank 500, with the end connected to the collector pipe 300 at a higher height than the other end.

[0123] Specifically, in this embodiment, the third pipeline 1000 is used to transfer the heat storage medium after the heat collector tube 300 absorbs heat to the heat tank 500. Since the height of the end of the third pipeline 1000 connected to the heat collector tube 300 is higher than the end of the third pipeline 1000 connected to the heat tank 500, the heat storage medium can flow under its own gravity, thus eliminating the need to set up an additional circulation pump to provide power for the flow of the heat storage medium, thereby saving production costs.

[0124] It should also be noted that a control valve can be adapted to be installed on the third pipeline 1000 according to actual needs to control the flow rate and volume of the heat storage medium. This embodiment does not impose any restrictions on this.

[0125] In an optional embodiment, the hillside self-flowing solar thermal power generation system further includes a fourth pipeline 1100 and a second return valve 1400. The two ends of the fourth pipeline 1100 are connected to the hot tank 500 and the cold tank 400, respectively. The second return valve 1400 is disposed on the fourth pipeline 1100 to control the opening and closing of the fourth pipeline 1100.

[0126] In this embodiment, the fourth pipeline 1100 is connected to the hot tank 500 and the cold tank 400 respectively. When the heat storage medium is insufficient, the fourth pipeline 1100 can perform circulating heat storage.

[0127] Specifically, when the temperature of the heat storage medium in the hot tank 500 is lower than the preset value, the temperature is insufficient for power generation. By opening the second return valve 1400, the heat storage medium in the hot tank 500 flows back into the cold tank 400 through the fourth pipe 1100, and then enters the heat collector tube 300 through the first pipe 800 to accumulate heat before returning to the hot tank 500. If the temperature still does not reach the preset value, the heat storage process is repeated until the temperature of the heat storage medium in the hot tank 500 reaches the preset value.

[0128] This embodiment, by employing the above-described technical solution, enables the thermal storage medium to circulate and store heat even when the temperature has not reached the preset value, thus achieving effective utilization of heat. Simultaneously, through circulating heat storage, the solar thermal power generation system can flexibly adjust its heat reserves according to actual needs, adapting to different working environments and load changes, and consistently maintaining a highly efficient and stable operating state.

[0129] In an optional embodiment, the recovery pipe assembly 700 includes a fifth pipe 701 and a sixth pipe 702, which are connected together. The other end of the fifth pipe 701 is connected to the power generation assembly 600, and the other end of the sixth pipe 702 is connected to the cold tank 400. The end of the fourth pipe 1100 that is not connected to the hot tank 500 is connected to the sixth pipe 702.

[0130] Specifically, in this embodiment, the recovery pipe assembly 700 includes a fifth pipe 701 and a sixth pipe 702. One end of the fifth pipe 701 is connected to the power generation component 600, and the other end is connected to the sixth pipe 702, thereby recovering the heat storage medium after heat exchange. The other end of the sixth pipe 702 is connected to the cold tank 400. The end of the fourth pipe 1100 that is not connected to the hot tank 500 is connected to the sixth pipe 702, so that it flows into the cold tank 400 through the sixth pipe 702 together with the fourth pipe 1100, thus saving pipeline costs.

[0131] In an optional embodiment, the recovery pipe assembly 700 further includes a third reflux valve 703, which is disposed on the fifth pipe 701 to control the opening and closing of the fifth pipe 701.

[0132] Specifically, in this embodiment, the third reflux valve 703 is installed on the fifth pipeline 701 to control the opening and closing of the fifth pipeline 701 and the flow rate and volume of the heat storage medium in the fifth pipeline 701, thereby ensuring the stability of the system.

[0133] In an optional embodiment, the sixth pipe 702 is disposed within the inclined section 103, and the end of the sixth pipe 702 connected to the fifth pipe 701 is higher than the end of the sixth pipe 702 connected to the cold tank 400.

[0134] Specifically, in this embodiment, the sixth pipe 702 is located within the sloping foundation 100 and within the inclined section 103. The end of the sixth pipe 702 connected to the fifth pipe 701 is higher than the end of the sixth pipe 702 connected to the cold tank 400. This allows the heat storage medium to flow into the cold tank 400 through the fifth pipe 701 via the sixth pipe 702 under its own gravity, thus eliminating the need for an additional circulation pump and saving production costs.

[0135] It should also be noted that, depending on actual needs, a control valve can be adapted to be installed on the sixth pipeline 702 to control the flow rate and volume of the heat storage medium. This embodiment does not impose any restrictions on this.

[0136] In an optional embodiment, the power generation assembly 600 includes a seventh pipe 602 and a heat exchanger 601. The two ends of the seventh pipe 602 are connected to the heat tank 500 and the recovery pipe assembly 700, respectively, and the heat exchanger 601 is disposed on the seventh pipe 602.

[0137] Specifically, in this embodiment, the power generation component 600 includes a seventh pipeline 602 and a heat exchanger 601. The heat exchanger 601 is disposed on the seventh pipeline 602. One end of the seventh pipeline 602 is connected to the heat tank 500, and the other end is connected to the recovery pipe group 700. The heat storage medium passes through the seventh pipeline 602 and exchanges heat at the heat exchanger 601 before flowing into the recovery pipe group 700.

[0138] In this embodiment, a second circulation pump 1600 is also installed on the seventh pipeline 602. The second circulation pump 1600 is used to pump the heat storage medium in the heat tank 500 into the seventh pipeline 602, thereby providing power for the flow of the heat storage medium and ensuring that the heat storage medium can flow smoothly along the seventh pipeline 602. At the same time, by setting the second circulation pump 1600, not only can the continuity of the flow of the heat storage medium be guaranteed, but also the flow rate and velocity of the heat storage medium can be precisely controlled, thereby achieving stable control of the system.

[0139] Specifically, the power generation component 600 also includes a steam turbine 603, a condenser 604, and a cooling tower 605. The steam turbine 603 is connected to the condenser 604 and the cooling tower 605 through circulation pipes. Water or other media are present in the circulation pipes, which are also connected to a heat exchanger 601. The media in the circulation pipes exchange heat with the heat storage medium through the heat exchanger 601, changing from a liquid state to a high-temperature, high-pressure gas state, and then enters the steam turbine 603 to generate electricity. After generating electricity, the high-temperature, high-pressure gas is converted into a low-temperature, low-pressure gas and enters the cooling tower 605 and the condenser 604 to condense into a liquid state, thus circulating again, thereby realizing the full utilization of solar energy resources.

[0140] Other embodiments of the present application will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. The embodiments of the present application are intended to cover any variations, uses, or adaptations of the embodiments of the present application that follow the general principles of the embodiments of the present application and include common knowledge or customary technical means in the art not disclosed in the embodiments of the present application. The specification and embodiments are to be considered exemplary only, and the true scope and spirit of the embodiments of the present application are indicated by the following claims.

[0141] It should be understood that the embodiments of this application are not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from their scope. The scope of the embodiments of this application is limited only by the appended claims.

Claims

1. A slope-mounted gravity-flow solar thermal power generation system, characterized in that, include: A sloping foundation platform, the sloping foundation platform having a first installation section, a second installation section and an inclined section, the inclined section being located between the first installation section and the second installation section, the inclined section having an inclined angle; The mirror field is set on the inclined section; A heat collection tube is located on the focusing axis of the mirror field to absorb sunlight reflected by the mirror field; A cold tank is installed on the second installation section. The cold tank is connected to the inlet end of the heat collection tube through a first pipeline. The cold tank contains a heat storage medium to be heated. The first pipeline is used to transfer the heat storage medium into the heat collection tube. The second pipeline is connected to the heat collection pipe and the cold tank respectively. The end of the second pipeline connected to the heat collection pipe is higher than the end of the second pipeline connected to the cold tank. The second pipeline is equipped with a heating element and a first reflux valve. The heating element is used to heat the heat storage medium in the second pipeline, and the first reflux valve is used to control the opening and closing of the second pipeline. A heat tank is installed on the first installation section and connected to the outlet end of the heat collection tube; A power generation component is connected to the heat tank; The recovery pipe assembly includes a fifth pipe and a sixth pipe, which are connected. The other end of the fifth pipe is connected to the power generation component, and the other end of the sixth pipe is connected to the cold tank. The sixth pipe is located within the inclined section, and the end of the sixth pipe connected to the fifth pipe is higher than the end of the sixth pipe connected to the cold tank. The fourth pipeline has one end connected to the hot tank and the other end connected to the sixth pipeline. The second reflux valve is installed on the fourth pipeline to control the opening and closing of the fourth pipeline.

2. The hillside gravity-flow solar thermal power generation system according to claim 1, characterized in that, The first pipeline includes a transmission section, an ascending section, and a descending section. The transmission section is located between the ascending section and the descending section. The two ends of the ascending section are respectively connected to the cold tank and the transmission section. The descending section is respectively connected to the transmission section and the heat collection pipe.

3. The hillside self-flowing solar thermal power generation system according to claim 2, characterized in that, It also includes a first circulation pump, which is disposed on the rising section.

4. The hillside gravity-flow solar thermal power generation system according to any one of claims 1-3, characterized in that, It also includes a third pipeline, one end of which is connected to the heat collection pipe and the other end of which is connected to the heat tank, and the end connected to the heat collection pipe is higher than the other end.

5. The hillside gravity-flow solar thermal power generation system according to claim 4, characterized in that, The recovery pipe assembly also includes a third reflux valve, which is installed on the fifth pipe to control the opening and closing of the fifth pipe.

6. The hillside gravity-flow solar thermal power generation system according to any one of claims 1-3, characterized in that, The tilt angle of the inclined section is between 7.84° and 67.85°.

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