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

Abstract

The invention provides a multi-tower one-machine photo-thermal power generation system which is composed of a tower type heat collection system and a conventional island, and the tower type heat collection system is composed of a heat absorption tower, a heliostat field and a cold salt tank; the conventional island is composed of a steam generation system, a steam turbine generator set and a hot salt tank. A heat absorption tower in the tower type heat collection system is arranged in a polygon shape, and the conventional island is located in the polygon shape. The heat absorption tower is arranged on the south side of the center of a heliostat field; a heat absorption tower in each tower type heat collection system is provided with a corresponding cold salt tank, and the heat absorption towers are communicated with a hot salt tank in the conventional island; 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-type 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 a 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 concentrating 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] In view of 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-type solar thermal power generation system and effectively reduce the cost at the same time.

[0005] To achieve the above object, the present invention provides a multi-tower one-machine solar thermal power generation system, which is composed of a tower-type heat collection system and a conventional island. The tower-type heat collection system consists of an absorber tower, a heliostat field, and a cold salt tank; the conventional island consists of a steam generation system, a steam turbine generator set, and a hot salt tank; the absorber tower in the tower-type heat collection system is arranged in a polygonal layout, and the conventional island is located inside the polygon; the absorber tower is arranged at the south side of the center of the heliostat field; each absorber tower in the tower-type heat collection system is respectively provided with a corresponding cold salt tank, and the cold salt tanks are all connected to the absorber tower and the steam generation system, and the absorber towers are all connected to the hot salt tank in the conventional island; the heliostat field reflects sunlight onto the absorber on the top of the absorber tower to heat 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, and sends the generated high-temperature steam to the steam turbine generator set for power generation. The water vapor and condensate generated by the power generation of the steam turbine generator set are transported to the steam generation system; the terrain of the cold salt tank and the hot salt tank is lower than that of the absorber tower; the volume of the hot salt tank is larger than that of the cold salt tank.

[0006] Further, the polygon is a regular polygon, and the conventional island is located at the center position of the regular polygon.

[0007] Further, the first position distance between the absorber tower and the cold salt tank in the tower-type heat collection system is less than the radius of the heliostat field.

[0008] Further, the length of the first pipeline between the absorber tower and the cold salt tank is less than the length of the second pipeline between the absorber tower and the hot salt tank.

[0009] Further, the length of the first pipeline between the absorber tower and the cold salt tank is less than the length of the third pipeline between the cold salt tank and the steam generation system.

[0010] Further, the nominal diameter of the fourth pipeline between the hot salt tank and the steam generation system is larger than the nominal diameter of the second pipeline between the absorber tower and the hot salt tank.

[0011] Further, the nominal diameter of the first pipeline between the absorber tower and the cold salt tank is larger than the nominal diameter of the third pipeline between the cold salt tank and the steam generation system.

[0012] To achieve the above object, the present invention provides a multi-tower one-machine solar thermal power generation system. The system consists of a tower-type heat collection system and a conventional island. The tower-type heat collection system is composed of an absorber tower, a heliostat field, a cold salt tank, and a hot salt tank; the conventional island is composed of a steam generation system and a steam turbine generator set; the absorber tower in the tower-type heat collection system is arranged in a polygonal layout, and the conventional island is located inside the polygon; the absorber tower is arranged at a position south of the center of the heliostat field; each absorber tower in the tower-type heat collection system is respectively provided with a corresponding cold salt tank and a hot salt tank, and the cold salt tank and the hot salt tank are respectively connected to the absorber tower and the steam generation system; the heliostat field reflects sunlight onto the absorber on the top of the absorber tower to heat 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 power generation of the steam turbine generator set are transported to the steam generation system; the terrains of the cold salt tank and the hot salt tank are both lower than the terrain of the absorber tower.

[0013] Further, the polygon is a regular polygon, and the conventional island is located at the center of the regular polygon.

[0014] Further, the first position distance between the absorber tower and the cold salt tank in the tower-type heat collection system is less than the radius of the heliostat field.

[0015] Further, the second position distance between the absorber tower and the hot salt tank in the tower-type heat collection system is less than the radius of the heliostat field.

[0016] Further, the first pipe length between the absorber tower and the cold salt tank is less than the second pipe length between the absorber tower and the hot salt tank.

[0017] Further, the first pipe length between the absorber tower and the cold salt tank is less than the third pipe length between the cold salt tank and the steam generation system.

[0018] Further, the nominal diameter of the fourth pipe between the hot salt tank and the steam generation system is greater than the nominal diameter of the second pipe between the absorber tower and the hot salt tank.

[0019] Further, the nominal diameter of the first pipe between the absorber tower and the cold salt tank is greater than the nominal diameter of the third pipe between the cold salt tank and the steam generation system.

[0020] To achieve the above object, the present invention provides a multi-tower one-machine solar thermal power generation system, which is composed of a tower-type heat collection system and a conventional island. The tower-type heat collection system is composed of an absorber tower, a heliostat field, a cold salt tank, and a hot salt tank; the conventional island is composed of a steam generation system, a steam turbine generator set, a cold salt tank, and a hot salt tank; the absorber tower in the tower-type heat collection system is arranged in a polygonal layout, and the conventional island is located inside the polygon; the absorber tower is arranged at a position south of the center of the heliostat field; each absorber tower in the tower-type heat collection system is respectively provided with a corresponding cold salt tank and a hot salt tank, and each cold salt tank in the tower-type heat collection system is connected to the cold salt tank in the conventional island; each hot salt tank in the tower-type heat collection system is connected to the hot salt tank in the conventional island; the heliostat field reflects sunlight onto the absorber on the top of the absorber tower to heat 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 power generation of the steam turbine generator set are transported to the steam generation system; the terrains of the cold salt tank and the hot salt tank are both lower than the terrain of the absorber tower; the volume of the hot salt tank in the conventional island is larger than the volume of the hot salt tank in the tower-type heat collection system; the volume of the cold salt tank in the conventional island is larger than the volume of the cold salt tank in the tower-type heat collection system.

[0021] Further, the polygon is a regular polygon, and the conventional island is located at the central position in the regular polygon.

[0022] Further, the first position distance between the absorber tower and the cold salt tank in the tower-type heat collection system is less than the radius of the heliostat field.

[0023] Further, the second position distance between the absorber tower and the hot salt tank in the tower-type heat collection system is less than the radius of the heliostat field.

[0024] Further, the first pipeline length between the absorber tower and the cold salt tank in the tower-type heat collection system is less than the second pipeline length between the absorber tower and the hot salt tank.

[0025] Further, the first pipeline length between the absorber tower and the cold salt tank in the tower-type heat collection system is less than the fifth pipeline length between the cold salt tank and the cold salt tank in the conventional island.

[0026] Furthermore, the nominal diameter of the sixth pipeline between the hot salt tank in the conventional island and the steam generation system is larger than that of the seventh pipeline between the hot salt tank in the tower type solar collection system and the hot salt tank in the conventional island.

[0027] Furthermore, the nominal diameter of the first pipeline between the solar receiver tower and the cold salt tank in the tower type solar collection system is larger than that of the fifth pipeline between the cold salt tank in the tower type solar collection system and the cold salt tank in the conventional island.

[0028] To achieve the above object, the present invention provides a multi-tower one-machine solar thermal power generation system, which is composed of a tower type solar collection system and a conventional island. The tower type solar collection system is composed of a solar receiver tower and a heliostat field; the conventional island is composed of a steam generation system, a steam turbine generator set, a cold salt tank and a hot salt tank; the solar receiver tower in the tower type solar collection system is arranged in a polygonal layout, and the conventional island is located inside the polygon; the solar receiver tower is arranged at the south side of the center of the heliostat field; each solar receiver tower in the tower type solar collection system is respectively connected to the cold salt tank and the hot salt tank in the conventional island; the heliostat field reflects sunlight onto the solar receiver at the top of the solar receiver tower to heat the low-temperature molten salt in the solar receiver; 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 solar receiver at the top of the solar receiver tower through a low-temperature molten salt pump; the hot salt tank is used to store the high-temperature molten salt heated by the solar receiver at the top of the solar receiver 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, and sends the generated high-temperature steam to the steam turbine generator set for power generation. The water vapor and condensate generated by the steam turbine generator set are transported to the steam generation system; the terrain of the cold salt tank and the hot salt tank is lower than that of the solar receiver tower.

[0029] Furthermore, the polygon is a regular polygon, and the conventional island is located at the center of the regular polygon.

[0030] Furthermore, the length of the fourth pipeline between the hot salt tank and the steam generation system is less than the length of the third pipeline between the cold salt tank and the steam generation system.

[0031] Furthermore, the length of the third pipeline between the cold salt tank and the steam generation system is less than the length of the first pipeline between the cold salt tank and the solar receiver tower.

[0032] Furthermore, the nominal diameter of the fourth pipeline between the hot salt tank and the steam generation system is larger than the nominal diameter of the second pipeline between the solar receiver tower and the hot salt tank.

[0033] Furthermore, the nominal diameter of the first pipeline between the heat absorption tower and the cold salt tank is larger than that of the third pipeline between the cold salt tank and the steam generation system.

[0034] To achieve the above object, the present invention provides a multi-tower one-machine solar thermal power generation system, which is composed of a tower-type heat collection system and a conventional island. The tower-type heat collection system is composed of a heat absorption tower and a heliostat field; the conventional island is composed of a steam generation system, a steam turbine generator set, a cold salt tank and a hot salt tank; the heat absorption towers in the tower-type heat collection system are arranged in a straight line and at equal distances, and the conventional island is located on the perpendicular bisector of the straight line; the heat absorption towers are arranged at the south side of the center of the heliostat field; each heat absorption tower in the tower-type heat collection system is respectively connected to the cold salt tank and the hot salt tank in the conventional island; the heliostat field reflects sunlight onto the heat absorber at the top of the heat absorption tower to heat the low-temperature molten salt in the heat 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 heat absorber at the top of the heat absorption tower through a low-temperature molten salt pump; the hot salt tank is used to store the high-temperature molten salt heated by the heat absorber at the top of the heat absorption 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 after power generation by the steam turbine generator set are transported to the steam generation system; the elevations of the cold salt tank and the hot salt tank are both lower than that of the heat absorption tower.

[0035] Furthermore, the length of the first pipeline between the heat absorption tower and the cold salt tank in the tower-type heat collection system is less than the length of the second pipeline between the heat absorption tower and the hot salt tank.

[0036] Furthermore, the length of the fourth pipeline between the hot salt tank and the steam generation system is less than the length of the third pipeline between the cold salt tank and the steam generation system.

[0037] Furthermore, the nominal diameter of the fourth pipeline between the hot salt tank and the steam generation system in the conventional island is larger than the nominal diameter of the second pipeline between the heat absorption tower in the tower-type heat collection system and the hot salt tank in the conventional island.

[0038] Furthermore, the nominal diameter of the first pipeline between the heat absorption tower and the cold salt tank is larger than that of the third pipeline between the cold salt tank and the steam generation system.

[0039] Compared with the prior art, the beneficial effects of the present invention are as follows: By optimizing the overall layout of the multi-tower one-machine solar thermal power generation system and designing the pipeline length and nominal pipeline 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, enabling it to always operate at a high efficiency; meanwhile, 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 embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 Schematic diagram of the process of a multi-tower one-machine solar thermal power generation system provided in Embodiment 1 of the present invention.

[0041] Figure 2 Schematic diagram of the process of a multi-tower one-machine solar thermal power generation system provided in Embodiment 2 of the present invention.

[0042] Figure 3 Schematic diagram of the process of a multi-tower one-machine solar thermal power generation system provided in Embodiment 3 of the present invention.

[0043] Figure 4 Schematic diagram of the process of a multi-tower one-machine solar thermal power generation system provided in Embodiment 4 of the present invention.

[0044] Figure 5 Schematic diagram of the process of a multi-tower one-machine solar thermal power generation system provided in Embodiment 5 of the present invention.

[0045] 1 - Absorption tower, 2 - Heliostat field, 3 - Cold salt tank, 4 - Hot salt tank, 5 - Steam generation system, 6 - Steam turbine generator set, 7 - First pipeline, 8 - Second pipeline, 9 - Third pipeline, 10 - Fourth pipeline, 11 - Fifth pipeline, 12 - Sixth pipeline, 13 - Seventh pipeline, 14 - Receiver, 15 - Tower-type heat collection unit, 16 - Conventional island. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0046] 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 be made. These all belong to the protection scope of the present invention.

[0047] Hereinafter, the technical solutions in the embodiments of the present application will be described with reference to the 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 distinguishing descriptions and cannot be understood as indicating or implying relative importance.

[0048] Certain directional terms used hereinafter to describe the drawings, such as "inner", "outer", "upper", "lower", "top", "bottom" and other directional terms, shall be understood to have their normal meanings and refer to those directions involved when the drawings are viewed normally. Unless otherwise specified, the directional terms described in this specification are basically in accordance with the conventional directions understood by those skilled in the art.

[0049] In the present invention, unless otherwise clearly specified and defined, terms such as "installed", "connected", "linked", "fixed", etc. shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may 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 circumstances.

[0050] Embodiment 1.

[0051] As Figure 1 shown, the present invention provides a multi-tower one-machine solar thermal power generation system, which is composed of a tower-type heat collection system and a conventional island. The tower-type heat collection system is composed of an absorber tower, a heliostat field and a cold salt tank (each absorber tower corresponds to a cold salt tank, that is, a cold salt tank is respectively arranged under each absorber tower); the conventional island is composed of a steam generation system, a steam turbine generator set and a hot salt tank; the absorber towers in the tower-type heat collection system are arranged in a polygonal layout, and the conventional island is located inside the polygon.

[0052] The absorber tower is arranged at the south side of the center of the heliostat field; setting the absorber tower at the south side of the mirror field center is beneficial for the heliostats to more effectively reflect and converge sunlight onto the absorber tower. Since the heliostats need to track the position of the sun to reflect light, such a layout can enable the heliostats to reflect light onto the absorber tower with a smaller angle deflection for most of the time, improving the light reflection efficiency and reducing the reflection loss caused by too large an angle.

[0053] Each absorber tower in each tower-type heat collection system is respectively provided with a corresponding cold salt tank. The cold salt tanks are all connected to the absorber tower and the steam generation system, and the absorber towers are all connected to the hot salt tank in the conventional island.

[0054] The heliostat field reflects sunlight onto the receiver at the top of the solar tower, which is used to heat the low-temperature molten salt in the receiver. At least one heliostat field is arranged around one solar 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 receiver at the top of the corresponding solar tower. There are shared mirror fields between the solar towers. The shapes and areas of the shared mirror fields are associated with the rated power of the receiver at the top of the corresponding solar tower, the position of the sun, and the operating conditions of the receiver in real time. In this embodiment, the layout of the mirror field and the layout and control of the shared mirror field can effectively improve the light collection efficiency of solar energy in the multi-tower and single-unit solar thermal power generation system, thereby improving the operating efficiency of the entire system.

[0055] 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, the local spaces in the storage tank can be multiple, and the number of local spaces occupied by the cold salt tank and the hot salt tank is determined according to the design requirements.

[0056] 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 high-temperature molten salt undergoes heat exchange through the steam generation system, and the heat-exchanged low-temperature molten salt is transported to the cold salt tank through a pipeline. The cold salt tank transports the low-temperature molten salt to the receiver at the top of the solar tower through a cold molten salt pump.

[0057] 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 solar tower transports the heated high-temperature molten salt to the hot salt tank by gravity. When necessary, a hot molten salt pump is set. Using gravity to transport the hot molten salt 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.

[0058] The steam generation system exchanges heat with the high-temperature molten salt from the hot salt tank, and sends the generated high-temperature steam to the steam turbine generator set for power generation. The water vapor and condensate generated after power generation by the steam turbine generator set are transported to the steam generation system; The terrains of the cold salt tank and the hot salt tank are both lower than the terrain of the solar tower. This design can effectively utilize gravity to transport the high-temperature molten salt to the hot salt tank, saving the use of molten salt pumps and reducing costs.

[0059] In this embodiment, the polygon is a regular polygon, and the conventional island is located at the central position in the regular polygon.

[0060] A regular polygon refers to a polygon with equal sides and equal interior angles, which is a geometric figure with high symmetry. Regular polygons can be equilateral triangles, squares (regular quadrilaterals), regular pentagons, regular hexagons, etc.

[0061] In this embodiment, the first position distance between the heat absorption tower and the cold salt tank in the tower-type heat collection system is less than the radius of the heliostat field.

[0062] Specifically, the first position distance refers to the straight-line distance between the heat absorption tower and the cold salt tank in the tower-type heat collection system, as exemplified below: If the coordinates of the heat absorption tower are (X1, Y1, Z1) and the coordinates of the cold salt tank are (X2, Y2, Z2), then the first position distance is .

[0063] The design here gives priority to considering the position of the cold salt tank and shortening the first position distance between the cold salt tank and the heat absorption tower as much as possible, which helps to reduce the pipe length of the cold molten salt input into the absorber and the number of cold salt pumps, can be transported to the heat absorption tower faster, helps to improve the operation efficiency of the entire multi-tower and single-machine thermal power generation system, and reduces costs.

[0064] At the same time, the cold salt tank cannot be set outside the heliostat field.

[0065] In this embodiment, the first pipe length between the heat absorption tower and the cold salt tank is less than the second pipe length between the heat absorption tower and the hot salt tank.

[0066] Specifically, the first pipe length refers to the pipe length between the cold molten salt outlet of the cold salt tank and the cold molten salt inlet of the absorber at the top of the heat absorption tower, and the second pipe length refers to the pipe length between the hot molten salt outlet of the absorber at the top of the heat absorption tower and the hot molten salt inlet of the hot salt tank. The first pipe length is less than the second pipe length. Prioritizing the determination of the position of the cold salt tank helps to reduce the pipe length for transporting the cold molten salt to the absorber. This design can reduce the pipe cost and also reduce the cold salt pumps in the pipeline, ultimately reducing the cost of the entire system.

[0067] In this embodiment, the first pipe length between the heat absorption tower and the cold salt tank is less than the third pipe length between the cold salt tank and the steam generation system.

[0068] Specifically, the first pipe length refers to the pipe length between the cold molten salt outlet of the cold salt tank and the cold molten salt inlet of the absorber at the top of the heat absorption tower, and the third pipe length refers to the pipe length between the molten salt outlet of the steam generation system and the molten salt inlet of the cold salt tank. The first pipe length is less than the third pipe length. Prioritizing the determination of the position of the cold salt tank helps to reduce the pipe length for transporting the cold molten salt to the absorber. This design can reduce the pipe cost and also reduce the cold salt pumps in the pipeline, ultimately reducing the cost of the entire system.

[0069] In this embodiment, the nominal diameter of the fourth pipe between the hot salt tank and the steam generation system is greater than the nominal diameter of the second pipe between the heat absorption tower and the hot salt tank.

[0070] Specifically, the fourth pipeline refers to the pipeline between the molten salt outlet of the hot salt tank and the molten salt inlet of the steam generation system. Since multiple heat absorption towers collect molten salt into the hot salt tank in the conventional island, only when the nominal diameter of the fourth pipeline is greater than that of the second pipeline can the real-time storage space of the hot salt tank be adjusted by regulating the conveying flow rate of the high-temperature molten salt, effectively adjusting the efficiency of the entire solar thermal power generation system and overall controlling the flow profile of the molten salt in the system.

[0071] In this embodiment, the nominal diameter of the first pipeline between the heat absorption tower and the cold salt tank is greater than that of the third pipeline between the cold salt tank and the steam generation system.

[0072] Specifically, the nominal diameter of the first pipeline is greater than that of the third pipeline, which can adjust the storage space of the cold salt tank in real time. At the same time, the conveying amount of the cold molten salt can be adjusted to a greater extent, which is more suitable for the adjustment of the real-time power of the heat absorber. That is, under the condition that the flow rates at the inlet and outlet of the cold salt tank are the same, the outlet pipeline (the first 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.

[0073] Embodiment 2.

[0074] As Figure 2 shown, the present invention provides a multi-tower one-machine solar thermal power generation system, which is composed of a tower-type heat collection system and a conventional island. The tower-type heat collection system is composed of a heat absorption tower, a heliostat field, a cold salt tank and a hot salt tank; the conventional island is composed of a steam generation system and a steam turbine generator set; the heat absorption towers in the tower-type heat collection system are arranged in a polygonal layout, and the conventional island is located inside the polygon.

[0075] The heat absorption tower is arranged at the south side of the center of the heliostat field; arranging the heat absorption tower at the south side of the center of the mirror field is beneficial for the heliostat to more effectively reflect and converge sunlight onto the heat absorption tower. Since the heliostat needs to track the position of the sun to reflect light, such a layout can enable the heliostat to reflect light onto the heat absorption tower with a smaller angle of deflection for most of the time, improving the light reflection efficiency and reducing the reflection loss caused by too large an angle.

[0076] Each heat absorption tower in the tower-type heat collection system is respectively provided with a corresponding cold salt tank and a hot salt tank, and the cold salt tank and the hot salt tank are respectively connected to the heat absorption tower and the steam generation system; each heat absorption tower is correspondingly provided with a corresponding cold salt tank and a hot salt tank, which can cooperate more precisely with the heat absorption power of the heat absorber at the top of the heat absorption tower, and can effectively improve the heat absorption efficiency of the entire solar thermal power generation system.

[0077] The heliostat field reflects sunlight onto the receiver at the top of the solar tower, which is used to heat the low-temperature molten salt in the receiver. At least one heliostat field is arranged around one solar tower. The shapes and areas of the heliostat fields can be the same or different, and they are related to the rated power of the receiver at the top of the corresponding solar tower. There are shared mirror fields between the solar towers. The shapes and areas of the shared mirror fields are related to the rated power of the receiver at the top of the corresponding solar tower, the position of the sun, and the operating conditions of the receiver 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 and single-unit solar thermal power generation system, thereby improving the operating efficiency of the entire system.

[0078] 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, the local spaces in the storage tank can be multiple, and the number of local spaces occupied by the cold salt tank and the hot salt tank is determined according to the design requirements.

[0079] 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 high-temperature molten salt undergoes heat exchange through the steam generation system, and the heat-exchanged low-temperature molten salt is transported to the cold salt tank through a pipeline. The cold salt tank transports the low-temperature molten salt to the receiver at the top of the solar tower through a cold molten salt pump.

[0080] 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 solar tower uses gravity to transport the heated high-temperature molten salt to the hot salt tank. When necessary, a hot molten salt pump is set. Using gravity to transport the hot molten salt 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.

[0081] 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 transports the water vapor and condensate generated after power generation by the steam turbine generator set to the steam generation system; The terrains of the cold salt tank and the hot salt tank are both lower than the terrain of the solar tower. This design can effectively use gravity to transport the high-temperature molten salt to the hot salt tank, saving the use of molten salt pumps and reducing costs.

[0082] In this embodiment, the polygon is a regular polygon, and the conventional island is located at the central position in the regular polygon.

[0083] A regular polygon refers to a polygon with equal sides and equal interior angles, which is a geometric figure with high symmetry. Regular polygons can be equilateral triangles, squares (regular quadrilaterals), regular pentagons, regular hexagons, etc.

[0084] In this embodiment, the first position distance between the heat absorption tower and the cold salt tank in the tower-type heat collection system is less than the radius of the heliostat field.

[0085] Specifically, the first position distance refers to the straight-line distance between the heat absorption tower and the cold salt tank in the tower-type heat collection system. The example is as follows: If the coordinates of the heat absorption tower are (X1, Y1, Z1) and the coordinates of the cold salt tank are (X2, Y2, Z2), then the first position distance is .

[0086] The design here is to give priority to the position of the cold salt tank and shorten the first position distance between the cold salt tank and the heat absorption tower as much as possible, which helps to reduce the pipe length of the cold molten salt input into the absorber and the number of cold salt pumps, can be transported to the heat absorption tower faster, helps to improve the operation efficiency of the entire multi-tower one-machine thermal power generation system, and reduces costs.

[0087] At the same time, the cold salt tank cannot be set outside the heliostat field.

[0088] In this embodiment, the second position distance between the heat absorption tower and the hot salt tank in the tower-type heat collection system is less than the radius of the heliostat field.

[0089] Specifically, the second position distance refers to the straight-line distance between the heat absorption tower and the cold salt tank in the tower-type heat collection system. The example is as follows: If the coordinates of the heat absorption tower are (X1, Y1, Z1) and the coordinates of the hot salt tank are (X3, Y3, Z3), then the second position distance is .

[0090] The design here is to give priority to the position of the hot salt tank and shorten the second position distance between the hot salt tank and the heat absorption tower as much as possible, reduce heat loss, and ultimately reduce costs. At the same time, the hot salt tank cannot be set outside the heliostat field.

[0091] In this embodiment, the first pipeline length between the heat absorption tower and the cold salt tank is less than the second pipeline length between the heat absorption tower and the hot salt tank.

[0092] Specifically, the first pipeline length refers to the pipeline length between the cold molten salt outlet of the cold salt tank and the cold molten salt inlet of the absorber at the top of the heat absorption tower, and the second pipeline length refers to the pipeline length between the hot molten salt outlet of the absorber at the top of the heat absorption tower and the hot molten salt inlet of the hot salt tank. The first pipeline length is less than the second pipeline length. Determining the position of the cold salt tank first helps to reduce the pipe length of the cold molten salt transported to the absorber. This design can reduce the pipeline cost and also reduce the cold salt pumps in the pipeline, ultimately reducing the cost of the entire system.

[0093] In this embodiment, the length of the first pipeline between the heat absorption tower and the cold salt tank is less than the length of the third pipeline between the cold salt tank and the steam generation system.

[0094] Specifically, the first pipeline length refers to the pipeline length between the cold molten salt outlet of the cold salt tank and the cold molten salt inlet of the absorber at the top of the absorption tower; the third pipeline length refers to the pipeline length between the molten salt outlet of the steam generation system and the molten salt inlet of the cold salt tank. The first pipeline length is smaller than the third pipeline length. Prioritizing the location of the cold salt tank helps to reduce the pipe trip for transporting the cold molten salt to the absorber. This design can reduce pipeline costs, as well as reduce the number of cold salt pumps in the pipeline, ultimately reducing the cost of the entire system.

[0095] In this embodiment, the nominal diameter of the fourth pipeline between the hot salt tank and the steam generation system is greater than the nominal diameter of the second pipeline between the heat absorption tower and the hot salt tank.

[0096] Specifically, the fourth pipeline refers to the pipeline between the hot molten salt outlet of the hot salt tank and the hot molten salt inlet of the steam generating system. When the nominal diameter of the fourth pipeline is larger than the nominal diameter of the second pipeline, the delivery flow of the high-temperature molten salt can be adjusted to adjust the real-time storage space of the hot salt tank, and the efficiency of the entire solar thermal power generation system can be effectively adjusted, so as to control the flow profile of the hot molten salt in the system as a whole.

[0097] In this embodiment, the nominal diameter of the first pipeline between the heat absorption tower and the cold salt tank is greater than the nominal diameter of the third pipeline between the cold salt tank and the steam generation system.

[0098] Specifically, the nominal diameter of the first pipeline is larger than the nominal diameter of the third pipeline, which can adjust the storage space of the cold salt tank in real time, and at the same time can adjust the delivery volume of the cold molten salt to a greater extent, and is more suitable for the real-time power adjustment of the heat absorber. That is, when the flow rate of the cold salt tank inlet and outlet is the same, the outlet pipeline (first pipeline) can better play a regulating role, protect the storage space of the cold salt tank, and maximize the heat absorption efficiency of the heat absorber.

[0099] Example 3.

[0100] like Figure 3 As shown, the present invention provides a multi-tower one-machine solar thermal power generation system, which consists of a tower-type heat collection system and a conventional island. The tower-type heat collection system consists of a heat absorption tower, a heliostat field, a cold salt tank and a hot salt tank; the conventional island consists of a steam generation system, a steam turbine generator set, a cold salt tank and a hot salt tank; the heat absorption tower in the tower-type heat collection system is in a polygonal layout, and the conventional island is located inside the polygon.

[0101] The heat absorption tower is arranged at the south side of the center of the heliostat field; placing the heat absorption tower at the south side of the center of the field is conducive to the heliostat to more effectively reflect sunlight to the heat absorption tower. Because the heliostat needs to track the position of the sun to reflect light, such a layout can enable the heliostat to reflect light to the heat absorption tower at a smaller angle most of the time, thereby improving the reflection efficiency of light and reducing the reflection loss caused by too large an angle.

[0102] Each of the heat absorption towers in the tower-type solar collector system is respectively arranged with a corresponding cold salt tank and a hot salt tank, and the cold salt tank and the hot salt tank are respectively connected to the heat absorption tower and the steam generating system; each heat absorption tower is provided with a corresponding cold salt tank and a hot salt tank, which can more accurately coordinate with the heat absorption power of the absorber at the top of the heat absorption tower, and can effectively improve the heat absorption efficiency of the entire solar thermal power generation system.

[0103] The heat absorption tower in each tower heat collection system is respectively arranged with a corresponding cold salt tank and a hot salt tank, and the cold salt tank in each tower heat collection system is respectively connected to the cold salt tank in the conventional island; the hot salt tank in each tower heat collection system is respectively connected to the hot salt tank in the conventional island, and the volume of the hot salt tank in the conventional island is greater than the volume of the hot salt tank in the tower heat collection system; the volume of the cold salt tank in the conventional island is greater than the volume of the cold salt tank in the tower heat collection system. This design can store more hot molten salt (store more heat) by collecting the molten salt in the cold salt tank and the hot salt tank in each tower heat collection system into the cold salt tank and the hot salt tank in the conventional island, and at the same time, it can more accurately control the heat absorption efficiency of the heat absorption tower, and can also more accurately control the amount of hot molten salt entering the steam generation system, and control the thermal efficiency of the steam generator.

[0104] The heliostat field reflects sunlight onto the absorber at the top of the absorption tower to heat the low-temperature molten salt in the absorber. At least one heliostat field is arranged around one absorption tower, and the shape and area of each heliostat field may be the same or different, which is associated with the rated power of the absorber at the top of the corresponding absorption tower. There is a reused mirror field between each absorption tower, and the shape and area of the reused mirror field are associated with the rated power of the absorber at the top of the corresponding absorption tower, the position of the sun, and the real-time working condition of the absorber. The layout of the mirror field in this example and the layout and control of the reused mirror field can effectively improve the concentration efficiency of solar energy in the multi-tower one-machine solar thermal power generation system, thereby improving the operating efficiency of the entire system.

[0105] The cold salt tank and the hot salt tank can be respectively arranged in the local space of a storage tank, and the local space 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.

[0106] The cold salt tank is used to store the low-temperature molten salt after the heat exchange is completed. The cold salt tank transports the low-temperature molten salt to the heat absorber at the top of the heat absorption tower through the low-temperature molten salt pump; the high-temperature molten salt undergoes heat exchange through the steam generation system, and the low-temperature molten salt after the heat exchange is transported to the cold salt tank through a pipeline, and the cold salt tank transports the low-temperature molten salt to the heat absorber at the top of the heat absorption tower through the cold molten salt pump.

[0107] The hot salt tank is used to store high-temperature molten salt heated by the absorber on the top of the heat absorption tower. The hot salt tank transports the high-temperature molten salt to the steam generation system through a high-temperature molten salt pump; the heat absorption tower transports the heated high-temperature molten salt to the hot salt tank by gravity. A molten salt pump is set when necessary. Using gravity to transport the molten salt can effectively reduce the number of molten salt pumps, which can effectively reduce the cost of the entire solar thermal power generation system.

[0108] The steam generation system performs heat exchange with the high-temperature molten salt from the hot salt tank, and sends the generated high-temperature steam to the steam turbine generator set for power generation, and the water vapor and condensed water generated by the steam turbine generator set for power generation are sent to the steam generation system; The terrain of the cold salt tank and the hot salt tank are both lower than that of the heat absorption tower. This design can effectively use gravity to transport high-temperature molten salt to the hot salt tank, which is practical and saves the number of molten salt pumps and saves costs.

[0109] In this embodiment, the polygon is a regular polygon, and the regular island is located at the center of the regular polygon.

[0110] A regular polygon is a polygon with equal sides and equal internal angles. It is a highly symmetrical geometric figure. Regular polygons can be regular triangles (equilateral triangles), squares (regular quadrilaterals), regular pentagons, regular hexagons, etc.

[0111] In this embodiment, the first position distance between the heat absorption tower and the cold salt tank in the tower-type solar collector system is smaller than the radius of the heliostat field.

[0112] Specifically, the first position distance refers to the straight-line distance between the heat absorption tower and the cold salt tank in the tower-type solar collector system, as shown in the following example: The coordinates of the heat absorption tower are (X1, Y1, Z1), and the coordinates of the cold salt tank are (X2, Y2, Z2). The distance to the first position is .

[0113] The design here is to give priority to the position of the cold salt tank and shorten the first position distance between the cold salt tank and the 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 tower, and 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 and reduce costs.

[0114] Meanwhile, the cold salt tank cannot be set outside the heliostat field.

[0115] In this embodiment, the second positional distance between the heat absorption tower and the hot salt tank in the tower-type heat collection system is less than the radius of the heliostat field.

[0116] Specifically, the second positional distance refers to the straight-line distance between the heat absorption tower and the cold salt tank in the tower-type heat collection system, and the example is as follows: If the coordinates of the heat absorption tower are (X1, Y1, Z1) and the coordinates of the hot salt tank are (X3, Y3, Z3), then the second positional distance is .

[0117] The design here gives priority to considering the position of the hot salt tank, as much as possible shortening the second positional distance between the hot salt tank and the heat absorption tower, reducing heat loss, and ultimately reducing costs. Meanwhile, the hot salt tank cannot be set outside the heliostat field.

[0118] In this embodiment, the length of the first pipeline between the heat absorption tower and the cold salt tank in the tower-type heat collection system is less than the length of the second pipeline between the heat absorption tower and the hot salt tank.

[0119] Specifically, the length of the first pipeline refers to the pipeline length between the cold molten salt outlet of the cold salt tank and the cold molten salt inlet of the heat absorber at the top of the heat absorption tower, and the length of the second pipeline refers to the pipeline length between the hot molten salt outlet of the heat absorber at the top of the heat absorption tower and the hot molten salt inlet of the hot salt tank. The length of the first pipeline is less than the length of the second pipeline. Prioritizing the determination of the position of the cold salt tank helps to reduce the pipe length for transporting cold molten salt to the heat absorber. This design can reduce pipeline costs and at the same time reduce the cold salt pumps in the pipeline, ultimately reducing the cost of the entire system.

[0120] In this embodiment, the length of the first pipeline between the heat absorption tower and the cold salt tank in the tower-type heat collection system is less than the length of the fifth pipeline between the cold salt tank and the cold salt tank in the conventional island.

[0121] Specifically, the length of the fifth pipeline refers to the pipeline length between the outlet of the cold salt tank in the conventional island and the inlet of the cold salt tank in the tower-type heat collection system. The length of the first pipeline is less than the length of the fifth pipeline. Prioritizing the determination of the position of the cold salt tank helps to reduce the pipe length for transporting cold molten salt to the heat absorber. This design can reduce pipeline costs and at the same time reduce the cold salt pumps in the pipeline, ultimately reducing the cost of the entire system.

[0122] In this embodiment, the nominal diameter of the sixth pipeline between the hot salt tank in the conventional island and the steam generation system is greater than the nominal diameter of the seventh pipeline between the hot salt tank in the tower-type heat collection system and the hot salt tank in the conventional island.

[0123] Specifically, the length of the sixth pipeline refers to the pipeline length between the outlet of the hot salt tank in the conventional island and the inlet of the molten salt in the steam generation system. The length of the seventh pipeline refers to the pipeline length between the outlet of the hot salt tank in the tower-type concentrating system and the inlet of the hot salt tank in the conventional island. The length of the sixth pipeline is less than that of the seventh pipeline. This design minimizes the pipeline length between the hot salt tank in the conventional island and the steam generation system, enabling the molten salt to enter the steam generation system at the first time. By reducing the length of the sixth pipeline, the heat loss of the molten salt during transmission can be reduced, while the pipeline utility cost can be decreased. Ultimately, it helps improve the operating efficiency of the entire multi-tower one-machine solar thermal power generation system and reduce costs.

[0124] In this embodiment, the nominal diameter of the first pipeline between the solar tower and the cold salt tank in the tower-type concentrating system is greater than the nominal diameter of the fifth pipeline between the cold salt tank in the tower-type concentrating system and the cold salt tank in the conventional island.

[0125] Specifically, the nominal diameter of the first pipeline being greater than that of the fifth pipeline can adjust the storage space of the cold salt tank in the tower-type concentrating system in real time. At the same time, it can adjust the conveying volume of the cold molten salt to a greater extent and is more suitable for adjusting the real-time power of the solar receiver. That is, under the condition that the flow rates at the inlet and outlet of the cold salt tank are the same, the outlet pipeline (the first pipeline) can better play the regulating role, protect the storage space of the cold salt tank, and maximize the heat absorption efficiency of the solar receiver.

[0126] Embodiment 4.

[0127] As Figure 4 shown, the present invention provides a multi-tower one-machine solar thermal power generation system, which consists of a tower-type concentrating system and a conventional island. The tower-type concentrating system consists of a solar tower and a heliostat field; the conventional island consists of a steam generation system, a steam turbine generator set, a cold salt tank, and a hot salt tank; the solar tower in the tower-type concentrating system is arranged in a polygonal layout, and the conventional island is located inside the polygon.

[0128] The solar tower is arranged at the south side of the center of the heliostat field; arranging the solar tower at the south side of the center of the field is beneficial for the heliostats to more effectively reflect and converge sunlight onto the solar tower. Since the heliostats need to track the position of the sun to reflect light, such a layout allows the heliostats to reflect light onto the solar tower with a smaller angle of deflection for most of the time, improving the light reflection efficiency and reducing the reflection loss caused by too large an angle.

[0129] Each solar tower in the tower-type concentrating system is respectively connected to the cold salt tank and the hot salt tank in the conventional island.

[0130] In each of the tower-type solar heat collection systems, a corresponding cold salt tank and a hot salt tank are respectively arranged for the heat absorption tower. The cold salt tanks in each of the tower-type solar heat collection systems are respectively connected to the cold salt tank in the conventional island; the hot salt tanks in each of the tower-type solar heat collection systems are respectively connected to the hot salt tank in the conventional island. The volume of the hot salt tank in the conventional island is larger than that of the hot salt tank in the tower-type solar heat collection system; the volume of the cold salt tank in the conventional island is larger than that of the cold salt tank in the tower-type solar heat collection system. This design can store more hot molten salt (store more heat) by collecting the molten salt in the cold salt tanks and hot salt tanks in each tower-type solar heat collection system into the cold salt tank and hot salt tank in the conventional island. At the same time, it can more accurately control the heat absorption efficiency of the heat absorption tower and can also more accurately control the amount of hot molten salt entering the steam generation system, thereby controlling the thermal efficiency of the steam generator.

[0131] The heliostat field reflects sunlight onto the heat absorber at the top of the heat absorption tower to heat the low-temperature molten salt in the heat absorber. At least one heliostat field is arranged around one heat absorption tower. The shapes and areas of the heliostat fields can be the same or different, and they are related to the rated power of the heat absorber at the top of the corresponding heat absorption tower. There are shared mirror fields between the heat absorption towers. The shapes and areas of the shared mirror fields are related to the rated power of the heat absorber at the top of the corresponding heat absorption tower, the position of the sun, and the operating conditions of the heat 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-unit solar thermal power generation system, thereby improving the operating efficiency of the entire system.

[0132] 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.

[0133] 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 heat absorber at the top of the heat absorption 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 pipeline. The cold salt tank transports the low-temperature molten salt to the heat absorber at the top of the heat absorption tower through a cold molten salt pump.

[0134] The hot salt tank is used to store the high-temperature molten salt heated by the heat absorber at the top of the heat absorption tower. The hot salt tank transports the high-temperature molten salt to the steam generation system through a high-temperature molten salt pump; the heat absorption tower transports the heated high-temperature molten salt to the hot salt tank by gravity. If 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.

[0135] 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 transports the water vapor and condensate generated by the power generation of the steam turbine generator set to the steam generation system; The elevations of both the cold salt tank and the hot salt tank are lower than that of the solar tower. This design can effectively utilize gravity to transport the high-temperature molten salt to the hot salt tank, saving the number of molten salt pumps and thus reducing costs.

[0136] In this embodiment, the polygon is a regular polygon, and the conventional island is located at the central position within the regular polygon.

[0137] A regular polygon refers to a polygon with equal sides and equal interior angles, which is a geometric figure with high symmetry. Regular polygons can be equilateral triangles, squares (regular quadrilaterals), regular pentagons, regular hexagons, etc.

[0138] In this embodiment, the length of the fourth pipeline between the hot salt tank and the steam generation system is less than the length of the third pipeline between the cold salt tank and the steam generation system.

[0139] Specifically, the length of the third pipeline refers to the pipeline length between the cold molten salt outlet of the steam generation system and the cold molten salt inlet of the cold salt tank, and the length of the fourth pipeline refers to the pipeline length between the hot molten salt outlet of the hot salt tank and the hot molten salt inlet of the steam generation system. The fact that the length of the fourth pipeline is less than the length of the third pipeline can enable the hot molten salt to enter the steam generation system in the first time, reduce the heat loss of the molten salt during the transmission process by reducing the length of the fourth pipeline, and at the same time reduce the pipeline usage cost. Ultimately, it helps to improve the operating efficiency of the entire multi-tower and one-unit thermal power generation system and reduce costs.

[0140] In this embodiment, the length of the third pipeline between the cold salt tank and the steam generation system is less than the length of the first pipeline between the cold salt tank and the solar tower.

[0141] Specifically, the length of the third pipeline refers to the pipeline length between the cold molten salt outlet of the steam generation system and the cold molten salt inlet of the cold salt tank, and the length of the first pipeline refers to the pipeline length between the cold molten salt outlet of the cold salt tank and the cold molten salt inlet of the solar absorber at the top of the solar tower. The fact that the length of the third pipeline is less than the length of the first pipeline can enable the molten salt after heat exchange through the steam generation system to enter the cold salt tank in the first time, reduce the heat loss of the molten salt during the transmission process by reducing the length of the third pipeline, and at the same time reduce the pipeline usage cost. Ultimately, it helps to improve the operating efficiency of the entire multi-tower and one-unit thermal power generation system and reduce costs.

[0142] In this embodiment, the nominal diameter of the fourth pipeline between the hot salt tank and the steam generation system is greater than the nominal diameter of the second pipeline between the solar tower and the hot salt tank.

[0143] Specifically, the fourth pipeline refers to the pipeline between the molten salt outlet of the hot salt tank and the molten salt inlet of the steam generation system. Since multiple heat absorption towers collect molten salt into the hot salt tank in the conventional island, only when the nominal diameter of the fourth pipeline is greater than that of the second pipeline can the real-time storage space of the hot salt tank be adjusted by regulating the conveying flow rate of the high-temperature molten salt, effectively adjusting the efficiency of the entire solar thermal power generation system and overall controlling the flow profile of the molten salt in the system.

[0144] In this embodiment, the nominal diameter of the first pipeline between the heat absorption tower and the cold salt tank is greater than the nominal diameter of the third pipeline between the cold salt tank and the steam generation system.

[0145] Specifically, the nominal diameter of the first pipeline is greater than that of the third pipeline, which can adjust the storage space of the cold salt tank in real time. At the same time, the conveying volume of the cold molten salt can be adjusted to a greater extent, which is more suitable for the adjustment of the real-time power of the heat absorber. That is, under the condition that the flow rates at the inlet and outlet of the cold salt tank are the same, the outlet pipeline (the first pipeline) can better play the regulating role, protect the storage space of the cold salt tank, and maximize the heat absorption efficiency of the heat absorber.

[0146] Embodiment 5.

[0147] As Figure 5 shown, the present invention provides a multi-tower one-machine solar thermal power generation system, which is composed of a tower-type heat collection system and a conventional island. The tower-type heat collection system is composed of heat absorption towers and a heliostat field; the conventional island is composed of a steam generation system, a steam turbine generator set, a cold salt tank and a hot salt tank; the heat absorption towers in the tower-type heat collection system are arranged in a straight line and at equal intervals, and the conventional island is located on the perpendicular bisector of the straight line.

[0148] The heat absorption towers are arranged at the south side of the center of the heliostat field; arranging the heat absorption towers at the south side of the center of the mirror field is conducive to the heliostats reflecting and converging sunlight onto the heat absorption towers more effectively. Since the heliostats need to track the position of the sun to reflect light, such an arrangement can enable the heliostats to reflect light onto the heat absorption towers with a smaller angle of deflection for most of the time, improving the light reflection efficiency and reducing the reflection loss caused by too large an angle.

[0149] Each heat absorption tower in the tower-type heat collection system is respectively connected to the cold salt tank and the hot salt tank in the conventional island.

[0150] In each of the tower-type solar heat collection systems, a corresponding cold salt tank and a hot salt tank are respectively arranged for the heat absorption tower. The cold salt tanks in each of the tower-type solar heat collection systems are respectively connected to the cold salt tank in the conventional island; the hot salt tanks in each of the tower-type solar heat collection systems are respectively connected to the hot salt tank in the conventional island. The volume of the hot salt tank in the conventional island is larger than that of the hot salt tank in the tower-type solar heat collection system; the volume of the cold salt tank in the conventional island is larger than that of the cold salt tank in the tower-type solar heat collection system. This design can store more hot molten salt (store more heat) by collecting the molten salt in the cold salt tanks and hot salt tanks in each tower-type solar heat collection system into the cold salt tank and hot salt tank in the conventional island. At the same time, it can more accurately control the heat absorption efficiency of the heat absorption tower and can also more accurately control the amount of hot molten salt entering the steam generation system, thus controlling the thermal efficiency of the steam generator.

[0151] The heliostat field reflects sunlight onto the absorber at the top of the heat absorption tower for heating the low-temperature molten salt in the absorber. At least one heliostat field is arranged around one heat absorption 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 heat absorption tower. There are shared mirror fields between the heat absorption 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 heat absorption 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-unit solar thermal power generation system, thereby improving the operating efficiency of the entire system.

[0152] 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.

[0153] 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 heat absorption 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 pipeline. The cold salt tank transports the low-temperature molten salt to the absorber at the top of the heat absorption tower through a cold molten salt pump.

[0154] The hot salt tank is used to store the high-temperature molten salt heated by the absorber at the top of the heat absorption tower. The hot salt tank transports the high-temperature molten salt to the steam generation system through a high-temperature molten salt pump; the heat absorption 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.

[0155] 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 power generation of the steam turbine generator set are transported to the steam generation system.

[0156] The elevations of both the cold salt tank and the hot salt tank are lower than that of the solar receiver tower. This design can effectively utilize gravity to transport the high-temperature molten salt to the hot salt tank, saving the number of molten salt pumps and thus reducing costs.

[0157] In this embodiment, the length of the first pipeline between the solar receiver tower and the cold salt tank in the tower-type solar collection system is less than the length of the second pipeline between the solar receiver tower and the hot salt tank.

[0158] Specifically, the length of the first pipeline refers to the pipeline length between the cold molten salt outlet of the cold salt tank and the cold molten salt inlet of the solar receiver at the top of the solar receiver tower, and the length of the second pipeline refers to the pipeline length between the hot molten salt outlet of the solar receiver at the top of the solar receiver tower and the hot molten salt inlet of the hot salt tank. The length of the first pipeline is less than the length of the second pipeline. Determining the position of the cold salt tank first helps to reduce the pipe length for transporting the cold molten salt to the solar receiver. This design can reduce the pipeline cost and at the same time reduce the cold salt pumps in the pipeline, ultimately reducing the cost of the entire system.

[0159] In this embodiment, the length of the fourth pipeline between the hot salt tank and the steam generation system is less than the length of the third pipeline between the cold salt tank and the steam generation system.

[0160] Specifically, the length of the third pipeline refers to the pipeline length between the cold molten salt outlet of the steam generation system and the cold molten salt inlet of the cold salt tank, and the length of the fourth pipeline refers to the pipeline length between the hot molten salt outlet of the hot salt tank and the hot molten salt inlet of the steam generation system. The length of the fourth pipeline being less than the length of the third pipeline can enable the hot molten salt to enter the steam generation system at the first time, reduce the heat loss of the hot molten salt during transmission by reducing the length of the fourth pipeline, and at the same time reduce the pipeline usage cost. Ultimately, it helps to improve the operating efficiency of the entire multi-tower and single-generator solar thermal power generation system and reduce costs.

[0161] In this embodiment, the nominal diameter of the fourth pipeline between the hot salt tank in the conventional island and the steam generation system is greater than the nominal diameter of the second pipeline between the solar receiver tower in the tower-type solar collection system and the hot salt tank in the conventional island.

[0162] Specifically, the fourth pipeline refers to the pipeline between the hot molten salt outlet of the hot salt tank and the hot molten salt inlet of the steam generation system. Since multiple solar receiver towers collect the hot molten salt into the hot salt tank in the conventional island, only when the nominal diameter of the fourth pipeline is greater than the nominal diameter of the second pipeline can the flow rate of the high-temperature molten salt be adjusted, the real-time storage space of the hot salt tank be adjusted, and the efficiency of the entire solar thermal power generation system be effectively adjusted, and the flow profile of the hot molten salt in the overall system can be controlled.

[0163] In this embodiment, the nominal diameter of the first pipeline between the heat absorption tower and the cold salt tank is larger than the nominal diameter of the third pipeline between the cold salt tank and the steam generation system.

[0164] Specifically, the nominal diameter of the first pipeline being larger than that of the third pipeline can adjust the storage space of the cold salt tank in real time, and at the same time can adjust the delivery volume of the cold molten salt to a greater extent, and is more suitable for adjusting the real-time power of the heat absorber. That is, under the condition that the flow rates at the inlet and outlet of the cold salt tank are the same, the outlet pipeline (the first pipeline) can better play the adjustment role, protect the storage space of the cold salt tank, and maximize the heat absorption efficiency of the heat absorber.

[0165] The above specific embodiments have described the technical solutions of the present invention in detail. Those skilled in the art can design devices such as butterfly valves, globe valves, check valves, regulating valves, and pumps on the pipeline according to different design requirements. At the same time, the number of heat absorption towers in the above embodiments is not specifically limited and can be multiple.

[0166] The above are only optional implementation manners of some implementation scenarios of this application. It should be noted that for those of ordinary skill in the art in this technical field, without departing from the technical concept of the solution of this application, using other similar implementation means based on the technical idea of this application also belongs to the protection scope of the embodiments of this application.

Claims

1. A multi-tower one-machine solar thermal power generation system, characterized in that, The system consists of a tower-type heat collection system and a conventional island. The tower-type heat collection system consists of an absorber tower, a heliostat field, and a cold salt tank; the conventional island consists of a steam generation system, a steam turbine generator set, and a hot salt tank; the absorber tower in the tower-type heat collection system is arranged in a polygonal layout, and the conventional island is located inside the polygon; the absorber tower is arranged at the south side of the center of the heliostat field; Each absorber tower in the tower-type heat collection system is respectively provided with a corresponding cold salt tank. The cold salt tanks are all connected to the absorber tower and the steam generation system, and the absorber towers are all connected to the hot salt tank in the conventional island; The heliostat field reflects sunlight onto the absorber on the top of the absorber tower to heat the low-temperature molten salt in the absorber; 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 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. 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 terrains of the cold salt tank and the hot salt tank are both lower than that of the absorber tower; The volume of the hot salt tank is larger than that of the cold salt tank.

2. The multi-tower one-machine solar thermal power generation system according to claim 1, wherein The polygon is a regular polygon, and the conventional island is located at the central position in the regular polygon.

3. The multi-tower one-machine solar thermal power generation system according to claim 1 or 2, wherein The first position distance between the absorber tower and the cold salt tank in the tower-type heat collection system is less than the radius of the heliostat field.

4. The multi-tower one-machine solar thermal power generation system according to claim 3, wherein The first pipeline length between the absorber tower and the cold salt tank is less than the second pipeline length between the absorber tower and the hot salt tank.

5. The multi-tower one-machine solar thermal power generation system according to claim 4, wherein, The first pipeline length between the absorber tower and the cold salt tank is less than the third pipeline length between the cold salt tank and the steam generation system.

6. The multi-tower-one-machine solar thermal power generation system according to claim 1 or 2, characterized in that The nominal diameter of the fourth pipeline between the hot salt tank and the steam generation system is larger than the nominal diameter of the second pipeline between the absorber tower and the hot salt tank.

7. The multi-tower one-machine solar thermal power generation system according to claim 1 or 2, wherein The nominal diameter of the first pipeline between the absorber tower and the cold salt tank is larger than the nominal diameter of the third pipeline between the cold salt tank and the steam generation system.

8. A multi-tower one-machine solar thermal power generation system, characterized in that, The system consists of a tower-type heat collection system and a conventional island. The tower-type heat collection system consists of an absorber tower, a heliostat field, a cold salt tank, and a hot salt tank; the conventional island consists of a steam generation system and a steam turbine generator set; the absorber tower in the tower-type heat collection system is arranged in a polygonal layout, and the conventional island is located inside the polygon; the absorber tower is arranged at the south side of the center of the heliostat field; Each absorber tower in the tower-type heat collection system is respectively provided with a corresponding cold salt tank and a hot salt tank. The cold salt tank and the hot salt tank are respectively connected to the absorber tower and the steam generation system; The heliostat field reflects sunlight onto the absorber on the top of the absorber tower to heat the low-temperature molten salt in the absorber; 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 on the top of the absorber tower through a low-temperature molten salt pump; The hot salt tank is used to store high-temperature molten salt heated by the heat absorber 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 transports the water vapor and condensate generated after power generation by the steam turbine generator set to the steam generation system; The terrains of both the cold salt tank and the hot salt tank are lower than that of the solar tower.

9. The multi-tower one-machine solar thermal power generation system according to claim 8, characterized in that, The polygon is a regular polygon, and the conventional island is located at the central position within the regular polygon.

10. The multi-tower one-machine solar thermal power generation system according to claim 8 or 9, wherein, The first positional distance between the solar tower and the cold salt tank in the tower-type solar collection system is less than the radius of the heliostat field.

11. The multi-tower one-machine solar thermal power generation system according to claim 10, wherein The second positional distance between the solar tower and the hot salt tank in the tower-type solar collection system is less than the radius of the heliostat field.

12. The multi-tower one-machine solar thermal power generation system according to claim 11, wherein, The length of the first pipeline between the solar tower and the cold salt tank is less than the length of the second pipeline between the solar tower and the hot salt tank.

13. The multi-tower one-machine solar thermal power generation system according to claim 12, wherein The length of the first pipeline between the solar tower and the cold salt tank is less than the length of the third pipeline between the cold salt tank and the steam generation system.

14. The multi-tower one-machine solar thermal power generation system according to claim 8 or 9, characterized in that, The nominal diameter of the fourth pipeline between the hot salt tank and the steam generation system is greater than the nominal diameter of the second pipeline between the solar tower and the hot salt tank.

15. The multi-tower one-machine solar thermal power generation system according to claim 8 or 9, characterized in that, The nominal diameter of the first pipeline between the solar tower and the cold salt tank is greater than the nominal diameter of the third pipeline between the cold salt tank and the steam generation system.

16. A multi-tower one-machine solar thermal power generation system, characterized in that, The system consists of a tower-type solar collection system and a conventional island. The tower-type solar collection system consists of a solar tower, a heliostat field, a cold salt tank, and a hot salt tank; the conventional island consists of a steam generation system, a steam turbine generator set, a cold salt tank, and a hot salt tank; the solar tower in the tower-type solar collection system is arranged in a polygonal layout, and the conventional island is located inside the polygon; the solar tower is arranged at the position south of the center of the heliostat field; Each solar tower in the tower-type solar collection system is respectively provided with a corresponding cold salt tank and a hot salt tank. Each cold salt tank in the tower-type solar collection system is respectively connected to the cold salt tank in the conventional island; each hot salt tank in the tower-type solar collection system is respectively connected to the hot salt tank in the conventional island; The heliostat field reflects sunlight onto the heat absorber at the top of the solar tower to heat the low-temperature molten salt in the heat absorber; 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 heat absorber at the top of the solar tower through a low-temperature molten salt pump; The hot salt tank is used to store high-temperature molten salt heated by the heat absorber 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 transports the water vapor and condensate generated after power generation by the steam turbine generator set to the steam generation system; The terrains of both the cold salt tank and the hot salt tank are lower than that of the solar tower; The volume of the hot salt tank in the conventional island is greater than the volume of the hot salt tank in the tower-type solar collection system; The volume of the cold salt tank in the conventional island is greater than the volume of the cold salt tank in the tower-type solar collection system.

17. The multi-tower one-machine solar thermal power generation system according to claim 16, wherein, The polygon is a regular polygon, and the conventional island is located at the central position within the regular polygon.

18. The multi-tower one-machine solar thermal power generation system according to claim 16 or 17, characterized in that The first positional distance between the heat absorption tower and the cold salt tank in the tower type solar thermal collection system is less than the radius of the heliostat field.

19. The multi-tower one-machine solar thermal power generation system according to claim 18, wherein The second positional distance between the heat absorption tower and the hot salt tank in the tower type solar thermal collection system is less than the radius of the heliostat field.

20. The multi-tower one-machine solar thermal power generation system according to claim 19, characterized in that, The first pipeline length between the heat absorption tower and the cold salt tank in the tower type solar thermal collection system is less than the second pipeline length between the heat absorption tower and the hot salt tank.

21. The multi-tower one-machine solar thermal power generation system according to claim 20, characterized in that, The first pipeline length between the heat absorption tower and the cold salt tank in the tower type solar thermal collection system is less than the fifth pipeline length between the cold salt tank and the cold salt tank in the conventional island.

22. The multi-tower one-machine solar thermal power generation system according to claim 16 or 17, wherein The nominal diameter of the sixth pipeline between the hot salt tank in the conventional island and the steam generation system is greater than the nominal diameter of the seventh pipeline between the hot salt tank in the tower type solar thermal collection system and the hot salt tank in the conventional island.

23. The multi-tower-one-machine solar thermal power generation system according to claim 16 or 17, characterized in that, The nominal diameter of the first pipeline between the heat absorption tower and the cold salt tank in the tower type solar thermal collection system is greater than the nominal diameter of the fifth pipeline between the cold salt tank in the tower type solar thermal collection system and the cold salt tank in the conventional island.

24. A multi-tower one-machine solar thermal power generation system, characterized in that, The system consists of a tower type solar thermal collection system and a conventional island. The tower type solar thermal collection system consists of a heat absorption tower and a heliostat field; the conventional island consists of a steam generation system, a steam turbine generator set, a cold salt tank, and a hot salt tank; the heat absorption tower in the tower type solar thermal collection system is arranged in a polygonal layout, and the conventional island is located inside the polygon; the heat absorption tower is arranged at the position south of the center of the heliostat field; Each heat absorption tower in the tower type solar thermal collection system is respectively connected to the cold salt tank and the hot salt tank in the conventional island; The heliostat field reflects sunlight onto the heat absorber at the top of the heat absorption tower to heat the low-temperature molten salt in the heat 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 heat absorber at the top of the heat absorption tower through a low-temperature molten salt pump; The hot salt tank is used to store the high-temperature molten salt heated by the heat absorber at the top of the heat absorption 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 after power generation by the steam turbine generator set are transported to the steam generation system; The terrains of the cold salt tank and the hot salt tank are both lower than the terrain of the heat absorption tower.

25. The multi-tower one-machine solar thermal power generation system according to claim 24, wherein The polygon is a regular polygon, and the conventional island is located at the central position within the regular polygon.

26. The multi-tower one-machine solar thermal power generation system according to claim 24 or 25, characterized in that, The length of the fourth pipeline between the hot salt tank and the steam generation system is less than the length of the third pipeline between the cold salt tank and the steam generation system.

27. The multi-tower one-machine solar thermal power generation system according to claim 26, wherein, The length of the third pipeline between the cold salt tank and the steam generation system is less than the length of the first pipeline between the cold salt tank and the heat absorption tower.

28. The multi-tower one-machine solar thermal power generation system according to claim 24 or 25, characterized in that The nominal diameter of the fourth pipeline between the hot salt tank and the steam generation system is greater than the nominal diameter of the second pipeline between the heat absorption tower and the hot salt tank.

29. The multi-tower one-machine solar thermal power generation system according to claim 24 or 25, characterized in that, The nominal diameter of the first pipeline between the heat absorption tower and the cold salt tank is greater than the nominal diameter of the third pipeline between the cold salt tank and the steam generation system.

30. A multi-tower one-machine solar thermal power generation system, characterized in that, The system consists of a tower-type heat collection system and a conventional island. The tower-type heat collection system consists of a heat absorption tower and a heliostat field; the conventional island consists of a steam generation system, a steam turbine generator set, a cold salt tank, and a hot salt tank; the heat absorption towers in the tower-type heat collection system are arranged in a straight line and at equal distances, and the conventional island is located on the perpendicular bisector of the straight line; the heat absorption towers are arranged at the south side of the center of the heliostat field; Each heat absorption tower in the tower-type heat collection system is respectively connected to the cold salt tank and the hot salt tank in the conventional island; The heliostat field reflects sunlight onto the heat absorber at the top of the heat absorption tower for heating the low-temperature molten salt in the heat 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 heat absorber at the top of the heat absorption tower through a low-temperature molten salt pump; The hot salt tank is used to store the high-temperature molten salt heated by the heat absorber at the top of the heat absorption 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 after power generation by the steam turbine generator set are transported to the steam generation system; The terrain of both the cold salt tank and the hot salt tank is lower than that of the heat absorption tower.

31. The multi-tower one-machine solar thermal power generation system according to claim 30, wherein The length of the first pipeline between the heat absorption tower in the tower-type heat collection system and the cold salt tank is less than the length of the second pipeline between the heat absorption tower and the hot salt tank.

32. The multi-tower one-machine solar thermal power generation system according to claim 31, wherein, The length of the fourth pipeline between the hot salt tank and the steam generation system is less than the length of the third pipeline between the cold salt tank and the steam generation system.

33. The multi-tower one-machine solar thermal power generation system according to claim 30, wherein, The nominal diameter of the fourth pipeline between the hot salt tank in the conventional island and the steam generation system is greater than the nominal diameter of the second pipeline between the heat absorption tower in the tower-type heat collection system and the hot salt tank in the conventional island.

34. The multi-tower one-machine solar thermal power generation system according to claim 30 or 33, characterized in that, The nominal diameter of the first pipeline between the heat absorption tower and the cold salt tank is greater than the nominal diameter of the third pipeline between the cold salt tank and the steam generation system.

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