Multi-tower one-machine photo-thermal power generation system

Abstract

The invention provides a multi-tower one-machine photo-thermal power generation system. The multi-tower one-machine photo-thermal power generation system comprises a heat absorption tower, a heliostat field, a cold salt tank, a hot salt tank, a steam generation system and a steam turbine generator set. The position distances between the steam generation system and the heat absorption towers are equal; the length of a first pipeline between the steam generation system and the hot salt tank is smaller than that of a second pipeline between the steam generation system and the cold salt tank; the terrain of the cold salt tank and the terrain of the hot salt tank are both lower than the terrain of the heat absorption tower. Through the overall optimization of the layout of the multi-tower one-machine photo-thermal power generation system and the design of the pipeline length and the pipeline nominal diameter, the power generation efficiency of the whole multi-tower one-machine photo-thermal power generation system can be effectively improved, and the multi-tower one-machine photo-thermal power generation system always keeps high-efficiency operation; and meanwhile, the construction cost of the multi-tower one-machine photo-thermal power generation system can be effectively reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of solar thermal power generation, and particularly to a multi-tower-one-machine solar thermal power generation system. Background Art

[0002] Currently, the world is facing extremely serious energy and environmental problems, and solar thermal power generation is one of the key technologies to solve these problems. The basic principle of solar thermal power generation is to focus the solar radiation energy around the power station on the heat collection area through a large number of reflectors or concentrators. The heat collection area heats the working medium to absorb the solar radiation energy to generate high-temperature steam, which drives the steam turbine generator set to generate electricity, thereby converting solar energy into electrical energy. Tower molten salt solar thermal power generation is one of the technical routes of solar thermal power generation. In the traditional one-tower-one-machine layout, the ability of a single heat absorption tower to collect solar energy is limited, and there are problems such as energy attenuation caused by long optical path and large heat loss of the heat absorber. For the above reasons, a multi-tower-one-machine solution has been proposed. The multi-tower-one-machine collects solar energy through multiple heat absorption towers and then concentrates the heat on one generator, which can improve the light collection and heat collection efficiency and increase the overall power generation.

[0003] Although the multi-tower-one-machine solution has obvious advantages compared with the one-tower-one-machine, the construction cost invested is still huge. How to layout the multi-tower-one-machine at low cost is still a problem focused on by the industry. At the same time, maintaining high-efficiency operation in the layout of the multi-tower-one-machine is also a problem focused on by the industry. Summary of the Invention

[0004] Aiming at the technical problems existing in the background art, the present invention provides a multi-tower-one-machine solar thermal power generation system, which can effectively improve the operation efficiency of the tower solar thermal power generation system and effectively reduce the cost at the same time.

[0005] A multi-tower one-machine solar thermal power generation system of the present invention, the system includes an absorber tower, a heliostat field, a cold salt tank, a hot salt tank, a steam generation system and a steam turbine generator set; the heliostat field reflects sunlight onto the absorber on the top of the absorber tower for heating the low-temperature molten salt in the absorber; the cold salt tank is used to store the low-temperature molten salt after heat exchange, and the cold salt tank transports the low-temperature molten salt to the absorber on the top of the absorber tower through a low-temperature molten salt pump; the hot salt tank is used to store the high-temperature molten salt heated by the absorber on the top of the absorber tower, and the hot salt tank transports the high-temperature molten salt to the steam generation system through a high-temperature molten salt pump; the steam generation system exchanges heat with the high-temperature molten salt from the hot salt tank, sends the generated high-temperature steam to the steam turbine generator set for power generation, and the water vapor and condensate generated by the steam turbine generator set are transported to the steam generation system; the first position distances between the steam generation system and the first absorber tower are all less than the position distances between the steam generation system and other absorber towers; the first pipeline length between the hot salt tank and the steam generation system is less than the second pipeline length between the steam generation system and the cold salt tank; the first absorber tower is the absorber tower with the largest rated power of the absorber on the top and the lowest terrain.

[0006] Further, a relay tank is arranged on the pipeline between the cold salt tank and the absorber tower.

[0007] Further, the third pipeline length between the cold salt tank and the first absorber tower is less than the pipeline lengths between the cold salt tank and other absorber towers.

[0008] Further, the fourth pipeline length between the hot salt tank and the first absorber tower is less than the pipeline distances between the hot salt tank and other absorber towers.

[0009] Further, the third pipeline length between the cold salt tank and the first absorber tower is not greater than the fourth pipeline length between the hot salt tank and the first absorber tower.

[0010] Further, the sixth pipeline length between the steam generation system and the steam turbine generator set is less than the fifth pipeline length between the steam generation system and the steam turbine generator set.

[0011] Further, the second position distance between the cold salt tank and the first absorber tower is less than the position distances between the cold salt tank and other absorber towers.

[0012] Further, the third position distance between the hot salt tank and the first absorber tower is less than the position distances between the hot salt tank and other absorber towers.

[0013] Further, the second positional distance between the cold salt tank and the first heat absorption tower is not greater than the third positional distance between the hot salt tank and the first heat absorption tower.

[0014] Further, the terrain where the cold salt tank and the hot salt tank are located is lower than the terrain where the first heat absorption tower is located.

[0015] Further, the area of the heliostat field is related to the rated power of the heat absorption tower and the height of the heat absorption tower.

[0016] Further, a relay tank is arranged between the heat absorption tower and the cold salt tank, a short-axis high-lift pump is arranged between the heat absorption tower and the relay tank, and a long-axis low-lift pump is arranged between the relay tank and the cold salt tank.

[0017] Further, the nominal diameter of the seventh pipeline between the cold salt tank and the heat absorption tower is greater than the nominal diameter of the second pipeline between the steam generation system and the cold salt tank, and a flow valve is arranged on the seventh pipeline.

[0018] Further, the nominal diameter of the sixth pipeline between the steam generation system and the steam turbine generator set is greater than the nominal diameter of the first pipeline between the hot salt tank and the steam generation system; and the nominal diameter of the first pipeline between the hot salt tank and the steam generation system is greater than the nominal diameter of the eighth pipeline between the hot salt tank and the heat absorption tower.

[0019] Further, the fourth positional distance between the relay tank and the heat absorption tower is less than the fifth positional distance between the relay tank and the cold salt tank.

[0020] Further, the length of the ninth pipeline between the relay tank and the heat absorption tower is less than the length of the tenth pipeline between the relay tank and the cold salt tank.

[0021] Further, the nominal diameter of the length of the ninth pipeline between the relay tank and the heat absorption tower is greater than the nominal diameter of the tenth pipeline between the relay tank and the cold salt tank.

[0022] Compared with the prior art, the beneficial effects of the present invention are as follows: Through the overall optimization of the layout of the multi-tower one-machine solar thermal power generation system and the design of the pipeline length and pipeline nominal diameter in the multi-tower one-machine solar thermal power generation system, the power generation efficiency of the entire multi-tower one-machine solar thermal power generation system can be effectively improved, so that it always operates at a high efficiency; at the same time, the construction cost of the multi-tower one-machine solar thermal power generation system can be effectively reduced. The specific beneficial effects are described in detail in the specific implementation manner. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1A layout diagram of a multi-tower one-machine solar thermal power generation system provided in Embodiment 1 of the present invention.

[0024] Figure 2 A layout diagram of a multi-tower one-machine solar thermal power generation system provided in Embodiment 2 of the present invention.

[0025] 1 - Absorption tower, 2 - Heliostat field, 3 - Cold salt tank, 4 - Hot salt tank, 5 - Steam generation system, 6 - Steam turbine generator set, 7 - Relay tank, 8 - First pipeline, 9 - Second pipeline, 10 - Third pipeline, 11 - Fourth pipeline, 12 - Fifth pipeline, 13 - Sixth pipeline, 14 - Seventh pipeline, 15 - Eighth pipeline, 16 - Ninth pipeline, 17 - Tenth pipeline, 18 - Short-axis high-lift pump, 19 - Long-axis low-lift pump, 20 - Absorber. Detailed implementation manners

[0026] The following embodiments will help those skilled in the art to further understand the present invention, but do not limit the present invention in any form. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several changes and improvements can still be made. These all belong to the protection scope of the present invention.

[0027] The technical solutions in the embodiments of the present application will be described below with reference to the accompanying drawings in the embodiments of the present application. In the description of the present application, terms such as "first" and "second" are only used for differential description and cannot be understood as indicating or implying relative importance.

[0028] Some directional terms used to describe the drawings hereinafter, such as "inner", "outer", "upper", "lower", "top", "bottom" and other directional terms will be understood to have their normal meanings and refer to the directions involved when normally viewing the drawings. Unless otherwise specified, the directional terms described in this specification are basically in the conventional directions understood by those skilled in the art.

[0029] In the present invention, unless otherwise clearly specified and defined, terms such as "installation", "connection", "connection", "fixation" and other terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. It can be the communication inside two components or the interaction relationship between two components, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0030] Embodiment 1.

[0031] As Figure 1As shown in the figure, the present invention provides a multi-tower one-machine solar thermal power generation system, which includes an absorber tower, a heliostat field, a cold salt tank, a hot salt tank, a steam generation system, and a steam turbine generator set.

[0032] The heliostat field reflects sunlight onto the absorber at the top of the absorber tower to heat the low-temperature molten salt in the absorber. At least one heliostat field is arranged around one absorber tower. The shapes and areas of the heliostat fields can be the same or different, and they are associated with the rated power of the absorber at the top of the corresponding absorber tower. There are shared mirror fields between the absorber towers. The shapes and areas of the shared mirror fields are associated with the rated power of the absorber at the top of the corresponding absorber tower, the position of the sun, and the operating conditions of the absorber in real time. In this example, the layout of the mirror field and the layout and control of the shared mirror field can effectively improve the solar concentrating efficiency in the multi-tower one-machine solar thermal power generation system, thereby improving the operating efficiency of the entire system.

[0033] The cold salt tank and the hot salt tank can be respectively arranged in local spaces in a storage tank. The local spaces in the storage tank can be multiple cold salt tanks or multiple hot salt tanks. That is, there can be multiple local spaces in the storage tank, and the number of local spaces occupied by the cold salt tank and the hot salt tank is determined according to the design requirements.

[0034] The cold salt tank is used to store the low-temperature molten salt after heat exchange. The cold salt tank transports the low-temperature molten salt to the absorber at the top of the absorber tower through a low-temperature molten salt pump; the high-temperature molten salt undergoes heat exchange in the steam generation system, and the heat-exchanged low-temperature molten salt is transported to the cold salt tank through a second pipeline. The cold salt tank transports the low-temperature molten salt to the absorber at the top of the absorber tower through a cold molten salt pump.

[0035] The hot salt tank is used to store the high-temperature molten salt heated by the absorber at the top of the absorber tower. The hot salt tank transports the high-temperature molten salt to the steam generation system through a high-temperature molten salt pump; the absorber tower transports the heated high-temperature molten salt to the hot salt tank by gravity. When necessary, a hot molten salt pump is set. Transporting the hot molten salt by gravity can effectively reduce the number of hot molten salt pumps set, and can effectively reduce the cost of the entire solar thermal power generation system.

[0036] The steam generation system exchanges heat with the high-temperature molten salt from the hot salt tank, sends the generated high-temperature steam to the steam turbine generator set for power generation, and the water vapor and condensed water generated after power generation by the steam turbine generator set are transported to the steam generation system.

[0037] Combined with Figure 1 As shown in the figure, some specific terms involved in the present invention are explained, and the specific explanations are as follows.

[0038] The first heat absorption tower: Sort the heat absorption towers in the entire multi-tower one-machine system. First, sort the heat absorption towers in descending order according to their rated power; second, if there are heat absorption towers with the same rated power among the heat absorption towers, sort them in ascending order according to the terrain where the heat absorption towers are located. Select the heat absorption tower with the largest rated power and the lowest terrain as the first heat absorption tower, and the other heat absorption towers are used as the second heat absorption tower, the third heat absorption tower, etc. according to the above logic. The specific example is as follows.

[0039] For example, if there are 5 heat absorption towers in a multi-tower one-machine solar thermal power generation system, sort the heat absorption towers in descending order according to their rated power: Heat absorption tower A, heat absorption tower B, heat absorption tower C, heat absorption tower D, heat absorption tower E; Sort the heat absorption towers in ascending order according to the terrain where they are located: Heat absorption tower A, heat absorption tower C, heat absorption tower D, heat absorption tower E, heat absorption tower B.

[0040] According to the above logic, it can be known that: The first heat absorption tower is heat absorption tower A, the second heat absorption tower is heat absorption tower B, the third heat absorption tower is heat absorption tower C, the fourth heat absorption tower is heat absorption tower D, and the fifth heat absorption tower is heat absorption tower E.

[0041] If the rated powers of heat absorption tower B and heat absorption tower C are equal, since the terrain of heat absorption tower C is lower than that of heat absorption tower B, the second heat absorption tower is heat absorption tower C.

[0042] In short, the definition of the first heat absorption tower to the fifth heat absorption tower should first consider the rated power of the heat absorption tower, and then consider the terrain where the heat absorption tower is located.

[0043] The terrains where the above cold salt tank and hot salt tank are located are both lower than the terrain where the first heat absorption tower is located. This design can effectively utilize gravity to transport the high-temperature molten salt to the hot salt tank, which is practical for saving the number of molten salt pumps and reducing costs.

[0044] In this embodiment, the first position distance between the steam generation system and the first heat absorption tower is less than the position distance between the steam generation system and other heat absorption towers.

[0045] Specifically, the first position distance refers to the straight-line distance between the steam generation system and the first heat absorption tower. The example is as follows: The coordinates of the steam generation system are (X1, Y1, Z1), and the coordinates of the first heat absorption tower are (X2, Y2, Z2), then the first position distance is .

[0046] The design here is to layout the steam generation system near the first heat absorption tower, that is, near the heat absorption tower with the highest rated power, which helps to reduce heat loss, improve power generation efficiency, ultimately helps to improve the operation efficiency of the entire multi-tower one-machine thermal power generation system, and reduce costs.

[0047] In this embodiment, the second position distance between the cold salt tank and the first heat absorption tower is smaller than the position distance between the cold salt tank and other heat absorption towers.

[0048] Specifically, the second position distance refers to the straight-line distance between the cold salt tank and the first heat absorption tower, as shown in the following example: The coordinates of the cold salt tank are (X3, Y3, Z3), and the coordinates of the first heat absorption tower are (X2, Y2, Z2). The distance of the first position is .

[0049] The design here is to arrange the cold salt tank near the first heat absorption tower, that is, to arrange it near the heat absorption tower with the highest rated power, which helps to reduce the pipe line of the cold molten salt input into the heat absorption tower, and can be transported to the first heat absorption tower with the highest rated power more quickly, which helps to improve the operating efficiency of the entire multi-tower one-machine thermal power generation system.

[0050] In this embodiment, the third position distance between the hot salt tank and the first heat absorption tower is smaller than the position distance between the hot salt tank and other heat absorption towers.

[0051] Specifically, the third position distance refers to the straight-line distance between the hot salt tank and the first heat absorption tower, as shown in the following example: The coordinates of the hot salt tank are (X4, Y4, Z4), and the coordinates of the first heat absorption tower are (X2, Y2, Z2). The distance to the first position is .

[0052] The design here is to arrange the hot salt tank near the first heat absorption tower, that is, to arrange it near the heat absorption tower with the highest rated power, which helps to reduce the pipe process for transporting the molten salt to the hot salt tank, thereby reducing the heat loss of the molten salt during the transmission process, while reducing the practical cost of the pipeline, and ultimately helping to improve the operating efficiency of the entire multi-tower one-machine thermal power generation system and reduce costs.

[0053] In this embodiment, the second position distance between the cold salt tank and the first heat absorption tower is not greater than the third position distance between the hot salt tank and the first heat absorption tower.

[0054] Specifically, the second position distance and the third position distance have been explained in detail above and will not be repeated here.

[0055] The design here is to give priority to the position of the cold salt tank and shorten the second position distance between the cold salt tank and the first heat absorption tower as much as possible, which helps to reduce the number of pipes and cold salt pumps for inputting cold molten salt into the heat absorption device, and can be transported to the first heat absorption tower with the highest rated power more quickly, which helps to improve the operating efficiency of the entire multi-tower one-machine thermal power generation system and reduce costs.

[0056] In this embodiment, the length of the first pipeline between the hot salt tank and the steam generation system is less than the length of the second pipeline between the steam generation system and the cold salt tank; Specifically, the length of the first pipeline refers to the pipeline length between the molten hot salt outlet of the hot salt tank and the molten hot salt inlet of the steam generation system, and the length of the second pipeline refers to the pipeline length between the molten cold salt inlet of the hot salt tank and the molten cold salt outlet of the steam generation system. The fact that the length of the first pipeline is less than that of the second pipeline enables the molten hot salt to enter the steam generation system hot in the first place. By reducing the length of the first pipeline, the heat loss of the molten hot salt during transmission can be reduced, and at the same time, the pipeline utility cost can be reduced. Ultimately, it helps to improve the operating efficiency of the entire multi-tower one-machine thermal power generation system and reduce costs.

[0057] In this embodiment, the length of the third pipeline between the cold salt tank and the first absorber tower is less than the pipeline lengths between the cold salt tank and other absorber towers.

[0058] Specifically, the length of the third pipeline refers to the pipeline length between the molten cold salt outlet of the cold salt tank and the inlet of the absorber at the top of the absorber tower. The fact that the length of the third pipeline is less than the pipeline lengths between the cold salt tank and other absorber towers can reduce the pipe path of the molten cold salt input into the absorber by reducing the length of the third pipeline, and it can be delivered to the first absorber tower with the highest rated power faster, which helps to improve the operating efficiency of the entire multi-tower one-machine thermal power generation system.

[0059] In this embodiment, the length of the fourth pipeline between the hot salt tank and the first absorber tower is less than the pipeline distances between the hot salt tank and other absorber towers.

[0060] Specifically, the length of the fourth pipeline refers to the pipeline length between the outlet of the absorber at the top of the absorber tower and the molten hot salt inlet of the hot salt tank. The fact that the length of the fourth pipeline is less than the pipeline lengths between the hot salt tank and other absorber towers can reduce the pipe path of the molten hot salt input into the hot salt tank by reducing the length of the fourth pipeline, thereby reducing the heat loss of the molten hot salt during transmission, and at the same time reducing the pipeline utility cost. Ultimately, it helps to improve the operating efficiency of the entire multi-tower one-machine thermal power generation system and reduce costs.

[0061] In this embodiment, the length of the third pipeline between the cold salt tank and the first absorber tower is not greater than the fourth pipeline distance between the hot salt tank and the first absorber tower.

[0062] Specifically, by first determining the position of the cold salt tank and ensuring that the length of the third pipeline is not greater than that of the fourth pipeline, it helps to reduce the pipe path for delivering the molten cold salt to the absorber. This design can reduce the pipeline cost and at the same time reduce the cold salt pump in the pipeline, ultimately reducing the cost of the entire system.

[0063] In this embodiment, the length of the sixth pipeline between the steam generation system and the steam turbine generator set is less than the length of the fifth pipeline between the steam generation system and the steam turbine generator set.

[0064] Specifically, the length of the sixth pipeline refers to the pipeline length between the high-temperature water vapor outlet of the steam generation system and the inlet of the steam turbine generator set. The length of the fifth pipeline refers to the pipeline length between the outlet of the steam turbine generator set and the inlet of the steam generation system. The length of the sixth pipeline is less than the length of the fifth pipeline. By reducing the length of the sixth pipeline, and thus reducing the pipe length for transporting high-temperature water vapor to the steam turbine generator set, high-temperature water vapor can enter the steam turbine generator set for power generation in the first time, reducing heat loss and improving power generation efficiency, which ultimately helps to improve the operating efficiency of the entire multi-tower one-machine thermal power generation system.

[0065] Embodiment 2.

[0066] As Figure 2 shown, on the basis of Embodiment 1, a relay tank is added between the heat absorption tower and the cold salt tank, a short-axis high-lift pump is arranged between the heat absorption tower and the relay tank, and a long-axis low-lift pump is arranged between the relay tank and the cold salt tank.

[0067] The layout of the above-mentioned relay tank, short-axis high-lift pump and long-axis low-lift pump can effectively reduce the vibration of the equipment in the system, reduce the failure rate of the equipment in the system, provide guarantee for operation, and help to improve the operating efficiency of the entire multi-tower one-machine thermal power generation system.

[0068] The quantities of the above-mentioned relay tank, short-axis high-lift pump and long-axis low-lift pump are reasonably arranged according to the overall design, and no specific limitation is made here.

[0069] In this embodiment, the fourth position distance between the relay tank and the heat absorption tower is less than the fifth position distance between the relay tank and the cold salt tank.

[0070] Specifically, the fourth position distance refers to the straight-line distance between the relay tank and the heat absorption tower, and the fifth position distance refers to the straight-line distance between the relay tank and the cold salt tank. The example is as follows: The coordinates of the cold salt tank are (X3, Y3, Z3), the coordinates of the relay tank are (X5, Y5, Z5), and the coordinates of the heat absorption tower are (X6, Y6, Z6). Among them, the coordinates of the heat absorption tower are the target of the heat absorption tower in the entire heat absorption system. In some cases, it is the same as the coordinates (X2, Y2, Z2) of the first heat absorption tower.

[0071] Then the fourth position distance is ; the fifth position distance is ; The design here is to layout the relay tank as close as possible near the heat absorption tower, select a suitable short-axis high-lift pump to improve the conveying efficiency of the cold molten salt, which helps to increase the heat absorption efficiency, and ultimately helps to improve the operating efficiency of the entire multi-tower one-machine thermal power generation system and reduce costs.

[0072] In this embodiment, the length of the ninth pipeline between the relay tank and the heat absorption tower is less than the length of the tenth pipeline between the relay tank and the cold salt tank.

[0073] Specifically, the length of the ninth pipeline refers to the pipeline length between the cold molten salt outlet of the relay tank and the inlet of the heat absorber at the top of the heat absorption tower. The length of the tenth pipeline refers to the pipeline length between the cold molten salt outlet of the cold salt tank and the inlet of the relay tank. The length of the ninth pipeline is less than the length of the tenth pipeline. By reducing the length of the ninth pipeline and thus reducing the pipe pass of the cold molten salt input into the heat absorber, it can be transported to the heat absorption tower faster, which helps to improve the operating efficiency of the entire multi-tower one-machine thermal power generation system.

[0074] Embodiment 3.

[0075] As Figure 1 - Figure 2 shown, on the basis of Embodiment 1 and Embodiment 2, optimizing the nominal diameter of the pipelines of the multi-tower one-machine thermal power generation system helps to improve the operating efficiency of the entire multi-tower one-machine thermal power generation system.

[0076] In this embodiment, the nominal diameter of the seventh pipeline between the cold salt tank and the heat absorption tower is greater than the nominal diameter of the second pipeline between the steam generation system and the cold salt tank, and a flow valve is provided on the seventh pipeline.

[0077] Among them, the seventh pipeline generally refers to the pipeline between the cold salt tank and the heat absorption tower in the entire heat absorption system. In some cases, it is the same as the third pipeline (the pipeline between the cold salt tank and the first heat absorption tower).

[0078] Specifically, the nominal diameter of the seventh pipeline is greater than that of the second pipeline, which can adjust the storage space of the cold salt tank in real time. At the same time, it can adjust the conveying volume of the cold molten salt to a greater extent and better adapt to the adjustment of the real-time power of the heat absorber. That is, when the flow rates at the inlet and outlet of the cold salt tank are the same, the outlet pipeline (the seventh pipeline) can play a better regulatory role, protect the storage space of the cold salt tank, and maximize the heat absorption efficiency of the heat absorber.

[0079] In this embodiment, the nominal diameter of the sixth pipeline between the steam generation system and the steam turbine generator set is greater than the nominal diameter of the first pipeline between the hot salt tank and the steam generation system; and the nominal diameter of the first pipeline between the hot salt tank and the steam generation system is greater than the nominal diameter of the eighth pipeline between the hot salt tank and the heat absorption tower.

[0080] Among them, the eighth pipeline generally refers to the pipeline between the hot salt tank and the solar receiver in the entire heat absorption system. In some cases, it is the same as the fourth pipeline (the pipeline between the hot salt tank and the first solar receiver).

[0081] Specifically, the nominal diameter of the sixth pipeline is larger than that of the first pipeline, which can adjust the high-temperature steam flow rate of the high-temperature steam generated by the steam generation system entering the steam turbine generator set in real time. This design can adjust the power generation efficiency according to the working conditions of the steam turbine generator set in real time, and can also transport the high-temperature steam generated by the steam generation system to the steam turbine generator set to the maximum extent. Finally, the working efficiency of the entire solar thermal power generation system can be improved. The nominal diameter of the first pipeline is larger than that of the eighth pipeline, which can adjust the transportation flow rate of the high-temperature molten salt and adjust the real-time storage space of the hot salt tank at the same time, effectively adjusting the efficiency of the entire solar thermal power generation system and controlling the flow profile of the hot molten salt in the system as a whole.

[0082] In this embodiment, the nominal diameter of the ninth pipeline between the relay tank and the solar receiver is larger than the nominal diameter of the tenth pipeline between the relay tank and the cold salt tank.

[0083] Specifically, the nominal diameter of the ninth pipeline is larger than that of the tenth pipeline, which can adjust the storage volume of the molten salt in the relay tank and the space of the relay tank in real time, and can transport the molten salt to the solar receiver to the maximum extent at the same time, improving the heat absorption efficiency of the solar receiver and finally effectively adjusting the efficiency of the entire solar thermal power generation system.

[0084] The specific embodiments of the present application have been described above. Those skilled in the art can design devices such as butterfly valves, globe valves, check valves, control valves, and pumps on the pipeline according to different design requirements. At the same time, the number of solar receivers in the above embodiments is not specifically limited and can be multiple.

[0085] The above are only optional implementation manners of some implementation scenarios of the present application. It should be noted that for those of ordinary skill in the art in the technical field, without departing from the technical concept of the solution of the present application, using other similar implementation means based on the technical idea of the present application also belongs to the protection scope of the embodiments of the present application.

Claims

1. A multi-tower one-machine solar thermal power generation system, characterized in that, The system includes a solar tower, a heliostat field, a cold salt tank, a hot salt tank, a steam generation system, and a steam turbine generator set; The heliostat field reflects sunlight onto the receiver at the top of the solar tower to heat the low-temperature molten salt in the receiver; The cold salt tank is used to store the low-temperature molten salt after heat exchange. The cold salt tank transports the low-temperature molten salt to the receiver at the top of the solar tower through a low-temperature molten salt pump; The hot salt tank is used to store the high-temperature molten salt heated by the receiver at the top of the solar tower. The hot salt tank transports the high-temperature molten salt to the steam generation system through a high-temperature molten salt pump; The steam generation system exchanges heat with the high-temperature molten salt from the hot salt tank, sends the generated high-temperature steam to the steam turbine generator set for power generation, and the water vapor and condensate generated after power generation by the steam turbine generator set are transported to the steam generation system; The first position distance between the steam generation system and the first solar tower is less than the position distances between the steam generation system and other solar towers; The first pipeline length between the hot salt tank and the steam generation system is less than the second pipeline length between the steam generation system and the cold salt tank; The first solar tower is the solar tower with the largest rated power of the receiver at the top of the solar tower and the lowest terrain; 2. The multi-tower one-machine solar thermal power generation system according to claim 1, wherein A relay tank is provided on the pipeline between the cold salt tank and the solar tower; 3. The multi-tower one-machine solar thermal power generation system according to claim 1 or 2, characterized in that The third pipeline length between the cold salt tank and the first solar tower is less than the pipeline lengths between the cold salt tank and other solar towers; 4. The multi-tower one-machine solar thermal power generation system according to claim 3, wherein The fourth pipeline length between the hot salt tank and the first solar tower is less than the pipeline distances between the hot salt tank and other solar towers; 5. The multi-tower one-machine solar thermal power generation system according to claim 4, wherein, The third pipeline length between the cold salt tank and the first solar tower is not greater than the fourth pipeline length between the hot salt tank and the first solar tower; 6. The multi-tower one-machine solar thermal power generation system according to claim 5, characterized in that, The sixth pipeline length between the steam generation system and the steam turbine generator set is less than the fifth pipeline length between the steam generation system and the steam turbine generator set; 7. The multi-tower one-machine solar thermal power generation system according to claim 6, wherein, The second position distance between the cold salt tank and the first solar tower is less than the position distances between the cold salt tank and other solar towers; 8. The multi-tower one-machine solar thermal power generation system according to claim 7, wherein, The third position distance between the hot salt tank and the first solar tower is less than the position distances between the hot salt tank and other solar towers; 9. The multi-tower one-machine solar thermal power generation system according to claim 8, wherein The second position distance between the cold salt tank and the first solar tower is not greater than the third position distance between the hot salt tank and the first solar tower; 10. The multi-tower one-machine solar thermal power generation system according to claim 1 or 9, wherein The terrains where the cold salt tank and the hot salt tank are located are both lower than the terrain where the first solar tower is located; 11. The multi-tower one-machine solar thermal power generation system according to claim 10, wherein, The area of the heliostat field is related to the rated power of the solar tower and the height of the solar tower; 12. The multi-tower one-machine solar thermal power generation system according to claim 2, wherein, A short-axis high-lift pump is provided between the solar tower and the relay tank, and a long-axis low-lift pump is provided between the relay tank and the cold salt tank; 13. The multi-tower one-machine solar thermal power generation system according to claim 1, characterized in that, The nominal diameter of the seventh pipeline between the cold salt tank and the solar tower is greater than the nominal diameter of the second pipeline between the steam generation system and the cold salt tank, and a flow valve is provided on the seventh pipeline; 14. The multi-tower one-machine solar thermal power generation system according to claim 13, wherein, The nominal diameter of the sixth pipeline between the steam generation system and the steam turbine generator set is larger than the nominal diameter of the first pipeline between the hot salt tank and the steam generation system; and the nominal diameter of the first pipeline between the hot salt tank and the steam generation system is larger than the nominal diameter of the eighth pipeline between the hot salt tank and the heat absorption tower.

15. The multi-tower one-machine solar thermal power generation system according to claim 12, wherein, The fourth position distance between the relay tank and the heat absorption tower is less than the fifth position distance between the relay tank and the cold salt tank.

16. The multi-tower one-machine solar thermal power generation system according to claim 15, characterized in that, The length of the ninth pipeline between the relay tank and the heat absorption tower is less than the length of the tenth pipeline between the relay tank and the cold salt tank.

17. The multi-tower one-machine solar thermal power generation system according to claim 16, characterized in that, The nominal diameter of the length of the ninth pipeline between the relay tank and the heat absorption tower is larger than the nominal diameter of the tenth pipeline between the relay tank and the cold salt tank.

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