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

Abstract

The invention provides a multi-tower one-machine photo-thermal power generation system. The multi-tower one-machine photo-thermal power generation system comprises a heat absorption tower, a heliostat field, a cold salt tank, a hot salt tank, a steam generation system and a steam turbine generator set. A first position distance between the steam generation system and the first heat absorption tower is equal to a second position distance between the steam generation system and the second heat absorption tower; the length of a first pipeline between the steam generation system and the hot salt tank is equal to that of a second pipeline between the steam generation system and the cold salt tank; the first heat absorption tower is the heat absorption tower with the maximum rated power of a heat absorber on the top and the lowest terrain. Through the overall optimization of the layout of the multi-tower one-machine photo-thermal power generation system and the design of the pipeline length and the pipeline nominal diameter, the power generation efficiency of the whole multi-tower one-machine photo-thermal power generation system can be effectively improved, and the multi-tower one-machine photo-thermal power generation system always keeps high-efficiency operation; and meanwhile, the construction cost of the multi-tower one-machine photo-thermal power generation system can be effectively reduced.

Description

Technical Field

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

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

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

[0004] 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] The present invention provides a multi-tower one-machine solar thermal power generation system, which includes an absorber tower, a heliostat field, a cold salt tank, a hot salt tank, a steam generation system and a steam turbine generator set; 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 after power generation by the steam turbine generator set are transported to the steam generation system; the first position distance between the steam generation system and the first absorber tower is equal to the second position distance between the steam generation system and the second absorber tower; the first pipeline length between the steam generation system and the hot salt tank is equal to the second pipeline length between the steam generation system and the cold salt tank; the first absorber tower is the absorber tower with the largest rated power of the absorber on the top and the lowest terrain.

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

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

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

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

[0010] Further, the fourth pipeline length between the hot salt tank and the second absorber tower is less than the first pipeline length between the steam generation system and the hot salt tank.

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

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

[0013] Further, a third positional distance between the cold salt tank and the first heat absorption tower is less than a first positional distance between the cold salt tank and the steam generation system.

[0014] Further, a fourth positional distance between the hot salt tank and the second heat absorption tower is less than a second positional distance between the steam generation system and the second heat absorption tower.

[0015] Further, a fifth pipe length between the steam generation system and the steam turbine generator set is less than a sixth pipe length between the steam generation system and the steam turbine generator set.

[0016] Further, the area of the heliostat field is related to the rated power of the heat absorption tower and the height of the heat absorption tower.

[0017] Further, a short-axis high-lift pump is provided between the heat absorption tower and the relay tank, and a long-axis low-lift pump is provided between the relay tank and the cold salt tank.

[0018] Further, the nominal diameter of a third pipe between the cold salt tank and the heat absorption tower is greater than the nominal diameter of a second pipe between the steam generation system and the cold salt tank, and a flow valve is provided on the third pipe.

[0019] Further, the nominal diameter of a fifth pipe between the steam generation system and the steam turbine generator set is greater than the nominal diameter of a first pipe between the hot salt tank and the steam generation system; and the nominal diameter of the first pipe between the hot salt tank and the steam generation system is greater than the nominal diameter of a fourth pipe between the hot salt tank and the heat absorption tower.

[0020] Further, a fifth positional distance between the relay tank and the heat absorption tower is less than a sixth positional distance between the relay tank and the cold salt tank.

[0021] Further, a seventh pipe length between the relay tank and the heat absorption tower is less than an eighth pipe length between the relay tank and the cold salt tank.

[0022] Further, the nominal diameter of the seventh pipe length between the relay tank and the heat absorption tower is greater than the nominal diameter of the eighth pipe between the relay tank and the cold salt tank.

[0023] Compared with the prior art, the beneficial effects of the present invention are as follows: Through the overall optimization of the layout of the multi-tower one-machine solar thermal power generation system and the design of the pipeline length and pipeline nominal diameter in the multi-tower one-machine solar thermal power generation system, the power generation efficiency of the entire multi-tower one-machine solar thermal power generation system can be effectively improved, enabling it to always operate at a high efficiency; at the same time, the construction cost of the multi-tower one-machine solar thermal power generation system can be effectively reduced. The specific beneficial effects are described in detail in the specific implementation manners. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 A layout diagram of a multi-tower one-machine solar thermal power generation system provided in Embodiment 1 of the present invention.

[0025] Figure 2 A layout diagram of a multi-tower one-machine solar thermal power generation system provided in Embodiment 2 of the present invention.

[0026] 1 - Absorption tower, 2 - Heliostat field, 3 - Cold salt tank, 4 - Hot salt tank, 5 - Steam generation system, 6 - Steam turbine generator set, 7 - Relay tank, 8 - First pipeline, 9 - Second pipeline, 10 - Third pipeline, 11 - Fourth pipeline, 12 - Fifth pipeline, 13 - Sixth pipeline, 14 - Seventh pipeline, 15 - Eighth pipeline, 16 - Short-axis high-lift pump, 17 - Long-axis low-lift pump, 18 - Absorber. SPECIFIC IMPLEMENTATION MANNERS

[0027] The following embodiments will help those skilled in the art to further understand the present invention, but do not limit the present invention in any form. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several changes and improvements can still be made. These all belong to the protection scope of the present invention.

[0028] The technical solutions in the embodiments of the present application will be described below with reference to the accompanying drawings in the embodiments of the present application. In the description of the present application, the terms "first", "second", etc. are only used for distinguishing descriptions and cannot be understood as indicating or implying relative importance.

[0029] Some directional terms used to describe the drawings hereinafter, such as "inner", "outer", "upper", "lower", "top", "bottom" and other directional terms will be understood to have their normal meanings and refer to those directions involved when normally viewing the drawings. Unless otherwise specified, the directional terms described in this specification are basically in the conventional directions understood by those skilled in the art.

[0030] In the present invention, unless otherwise clearly specified and defined, terms such as "installation", "connection", "linkage", "fixation", 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 a direct connection or an indirect connection through an intermediate medium, and it may be the internal communication of 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.

[0031] Embodiment 1.

[0032] As Figure 1 shown, the present invention provides a multi-tower one-machine solar thermal power generation system, which includes an absorber tower, a heliostat field, a cold salt tank, a hot salt tank, a steam generation system, and a steam turbine generator set.

[0033] The heliostat field reflects sunlight onto the absorber at the top of the absorber tower to heat the low-temperature molten salt in the absorber. At least one heliostat field is arranged around one absorber tower. The shapes and areas of the heliostat fields can be the same or different, and they are related to the rated power of the absorber at the top of the corresponding absorber tower. There are multiplexed mirror fields between the absorber towers. The shapes and areas of the multiplexed mirror fields are related to the rated power of the absorber at the top of the corresponding absorber tower, the position of the sun, and the operating conditions of the absorber in real time. In this embodiment, the layout of the mirror field, the layout of the multiplexed mirror field, and the control can effectively improve the solar light concentration efficiency in the multi-tower one-machine solar thermal power generation system, thereby improving the operating efficiency of the entire system. The area of the heliostat field is related to both the rated power of the absorber tower and the height of the absorber tower.

[0034] 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 design requirements.

[0035] The cold salt tank is used to store the low-temperature molten salt after heat exchange. The cold salt tank transports the low-temperature molten salt to the absorber at the top of the absorber tower through a low-temperature molten salt pump; the high-temperature molten salt undergoes heat exchange through the steam generation system, and the heat-exchanged low-temperature molten salt is transported to the cold salt tank through a second pipeline. The cold salt tank transports the low-temperature molten salt to the absorber at the top of the absorber tower through a cold molten salt pump.

[0036] The hot salt tank is used to store the high-temperature molten salt heated by the 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 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 installed, and can effectively reduce the cost of the entire solar thermal power generation system.

[0037] 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 terrain of the above-mentioned cold salt tank and hot salt tank is 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, save the use of molten salt pumps, and thus save costs.

[0038] The area of the heliostat field is related to the rated power of the solar tower and the height of the solar tower.

[0039] In this embodiment, the position distances between the steam generation system and each solar tower are equal. Specifically, the position distances between the steam generation system and each solar tower are as follows: If the coordinates of the steam generation system are (X1, Y1, Z1) and the coordinates of the solar tower are (X2, Y2, Z2), then the position distance between the steam generation system and each solar tower .

[0040] The design here is to layout the steam generation system in the middle position between the first solar tower and the first solar tower, which helps with the selection of equipment on both sides, simplifies the equipment specifications in the entire multi-tower one-machine solar thermal power generation system, can effectively reduce costs, and saves the selection time at the same time.

[0041] In this embodiment, the length of the first pipeline between the steam generation system and the hot salt tank is less than the length of the second pipeline between the steam generation system and the cold salt tank.

[0042] Specifically, the length of the first 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, and the length of the second pipeline refers to the pipeline length between the cold molten salt inlet of the hot salt tank and the cold molten salt outlet of the steam generation system. The length of the first pipeline being less than the length of the second pipeline can enable the hot molten salt to enter the steam generation system for heat in the first time, reduce the heat loss of the hot molten salt during transmission by reducing the length of the first pipeline, and at the same time reduce the pipeline utility cost, ultimately helping to improve the operating efficiency of the entire multi-tower one-machine solar thermal power generation system and reduce costs.

[0043] In this embodiment, the lengths of the third pipelines between the cold salt tank and the heat absorption tower are all equal.

[0044] Specifically, the length of the third pipeline refers to the pipeline length between the cold molten salt outlet of the cold salt tank and the inlet of the heat absorber at the top of the heat absorption tower. That is: the pipeline lengths between the cold molten salt outlet of the cold salt tank and the inlet of the heat absorber at the top of the heat absorption tower are all equal. The equal lengths of the third pipelines can enable the related equipment (valves, pumps, etc.) provided on the third pipelines to adopt the same models, simplify the equipment specifications in the entire multi-tower one-machine thermal power generation system, effectively reduce costs, and save the model selection time at the same time.

[0045] In this embodiment, the lengths of the fourth pipelines between the hot salt tank and the heat absorption tower are all equal.

[0046] Specifically, the length of the fourth pipeline refers to the pipeline length between the outlet of the heat absorber at the top of the heat absorption tower and the hot molten salt inlet of the hot salt tank. That is: the pipeline lengths between the outlet of the heat absorber at the top of the heat absorption tower and the hot molten salt inlet of the hot salt tank are all equal. The equal lengths of the fourth pipelines can enable the related equipment (valves, pumps, etc.) provided on the third pipelines to adopt the same models, simplify the equipment specifications in the entire multi-tower one-machine thermal power generation system, effectively reduce costs, and save the model selection time at the same time.

[0047] In this embodiment, the length of the third pipeline between the cold salt tank and the heat absorption tower is greater than the length of the second pipeline between the cold salt tank and the steam generation system.

[0048] Specifically, the length of the third pipeline is greater than the length of the second pipeline (the steam generation system is arranged as close as possible to the cold salt tank accessory). By reducing the length of the second pipeline, the pipe length for transporting the cold molten salt after heat exchange to the cold salt tank is reduced as much as possible, heat loss is reduced, and at the same time, the pipeline usage cost is reduced. Ultimately, it helps to improve the operating efficiency of the entire multi-tower one-machine thermal power generation system and reduce costs.

[0049] In this embodiment, the length of the fourth pipeline between the hot salt tank and the heat absorption tower is greater than the length of the first pipeline between the steam generation system and the hot salt tank.

[0050] Specifically, the length of the fourth pipeline is greater than the length of the first pipeline (the steam generation system is arranged as close as possible to the hot salt tank accessory). By reducing the length of the first pipeline, the pipe length for transporting the hot molten salt to the steam generation system is reduced, and further, the heat loss of the hot molten salt during transmission is reduced. At the same time, the pipeline practical cost is reduced, and the operating efficiency of the steam generation system is improved. Ultimately, it helps to improve the operating efficiency of the entire multi-tower one-machine thermal power generation system and reduce costs.

[0051] In this embodiment, the position distances between the cold salt tank and the heat absorption tower are all equal.

[0052] Specifically, the positional distance between the cold salt tank and the heat absorption tower is exemplified as follows: If the coordinates of the cold salt tank are (X3, Y3, Z3) and the coordinates of the heat absorption tower are (X2, Y2, Z2), then the positional distance between the cold salt tank and the heat absorption tower .

[0053] The design here further restricts the positional distance between the cold salt tank and the heat absorption tower, thereby further restricting the pipe length between the cold salt tank and the heat absorption tower. It can make the pipe lengths between the cold salt tank and the heat absorption tower more precisely equal, so that the pipeline working conditions between the cold salt tank and the heat absorption tower are the same. Then, the related equipment (valves, pumps, etc.) installed on the pipeline can adopt the same model, simplifying the equipment specifications in the entire multi-tower and single-unit thermal power generation system, effectively reducing costs and saving the selection time at the same time.

[0054] In this embodiment, the positional distances between the hot salt tank and the heat absorption tower are all equal.

[0055] Specifically, the positional distance between the hot salt tank and the heat absorption tower is exemplified as follows: If the coordinates of the cold salt tank are (X4, Y4, Z4) and the coordinates of the heat absorption tower are (X2, Y2, Z2), then the positional distance between the cold salt tank and the heat absorption tower .

[0056] The design here further restricts the positional distance between the hot salt tank and the heat absorption tower, thereby further restricting the pipe length between the hot salt tank and the heat absorption tower. It can make the pipe lengths between the hot salt tank and the heat absorption tower more precisely equal, so that the pipeline working conditions between the hot salt tank and the heat absorption tower are the same. Then, the related equipment (valves, pumps, etc.) installed on the pipeline can adopt the same model, simplifying the equipment specifications in the entire multi-tower and single-unit thermal power generation system, effectively reducing costs and saving the selection time at the same time.

[0057] In this embodiment, the positional distance between the cold salt tank and the heat absorption tower is greater than the positional distance between the cold salt tank and the steam generation system.

[0058] Specifically, the positional distance between the cold salt tank and the heat absorption tower is greater than the positional distance between the cold salt tank and the steam generation system. Further restrictions are made to set the steam generation system as close as possible to the cold salt tank, thereby further reducing the pipe length for transporting the cold molten salt after heat exchange to the cold salt tank, reducing heat loss, and at the same time reducing the pipeline usage cost. Ultimately, it helps to improve the operation efficiency of the entire multi-tower and single-unit thermal power generation system and reduce costs.

[0059] In this embodiment, the positional distance between the hot salt tank and the heat absorption tower is greater than the positional distance between the steam generation system and the hot salt tank.

[0060] Specifically, the positional distance between the hot salt tank and the heat absorption tower is greater than the positional distance between the hot salt tank and the steam generation system. Further restrictions are imposed to set the steam generation system as close as possible to the hot salt tank, thereby further reducing the pipe length for transporting the molten salt to the steam generation system, reducing heat loss, while also reducing the pipeline usage cost. Ultimately, this helps improve the operating efficiency of the entire multi-tower and single-unit thermal power generation system and reduces costs.

[0061] In this embodiment, the length of the fifth pipeline between the steam generation system and the steam turbine generator set is less than the length of the sixth pipeline between the steam generation system and the steam turbine generator set.

[0062] Specifically, the length of the fifth pipeline refers to the pipeline length between the high-temperature water vapor outlet of the steam generation system and the inlet of the steam turbine generator set. The length of the sixth pipeline refers to the pipeline length between the outlet of the steam turbine generator set and the inlet of the steam generation system. The length of the fifth pipeline is less than the length of the sixth pipeline. By reducing the length of the fifth pipeline, and thus reducing the pipe length for transporting the high-temperature water vapor to the steam turbine generator set, it is possible to enable the high-temperature water vapor to enter the steam turbine generator set for power generation in the first instance, improving the power generation efficiency. Ultimately, this helps improve the operating efficiency of the entire multi-tower and single-unit thermal power generation system and reduces costs.

[0063] Embodiment 2.

[0064] As Figure 2 shown, based on Embodiment 1, a relay tank is added between the heat absorption tower and the cold salt tank, a short-axis high-lift pump is provided between the heat absorption tower and the relay tank, and a long-axis low-lift pump is provided between the relay tank and the cold salt tank.

[0065] The layout of the above-mentioned relay tank, short-axis high-lift pump, and long-axis low-lift pump can effectively reduce the vibration of the equipment in the system, reduce the failure rate of the equipment in the system, provide guarantee for operation, and help improve the operating efficiency of the entire multi-tower and single-unit thermal power generation system.

[0066] The quantities of the above-mentioned relay tank, short-axis high-lift pump, and long-axis low-lift pump are based on the overall design, and the quantities are reasonably arranged. No specific restrictions are made here.

[0067] In this embodiment, the positional distance between the relay tank and the heat absorption tower is less than the positional distance between the relay tank and the cold salt tank.

[0068] Specifically, the coordinates of the relay tank are (X5, Y5, Z5), the coordinates of the heat absorption tower are (X2, Y2, Z2), and the coordinates of the cold salt tank are (X3, Y3, Z3). Then the positional distance between the relay tank and the heat absorption tower is ; The positional distance between the relay tank and the cold salt tank is .

[0069] The design here is to layout the relay tank as close as possible to the heat absorption tower, select a suitable short-axis high-lift pump to improve the conveying efficiency of the cold molten salt, which helps to increase the heat absorption efficiency, and ultimately helps to improve the operating efficiency of the entire multi-tower one-machine thermal power generation system and reduce costs.

[0070] In this embodiment, the length of the seventh pipeline between the relay tank and the heat absorption tower is less than the length of the eighth pipeline between the relay tank and the cold salt tank.

[0071] Specifically, the length of the seventh pipeline refers to the pipeline length between the cold molten salt outlet of the relay tank and the inlet of the heat absorber at the top of the heat absorption tower. The length of the eighth pipeline refers to the pipeline length between the cold molten salt outlet of the cold salt tank and the inlet of the relay tank. The length of the seventh pipeline is less than the length of the eighth pipeline. By reducing the length of the seventh pipeline and thus reducing the pipe path for the cold molten salt to enter the heat absorber, it can be transported to the heat absorption tower faster, which helps to improve the operating efficiency of the entire multi-tower one-machine thermal power generation system.

[0072] Embodiment 3.

[0073] As Figure 1 - Figure 2 shown, based on Embodiment 1 and Embodiment 2, optimizing the nominal diameter of the pipelines of the multi-tower one-machine thermal power generation system helps to improve the operating efficiency of the entire multi-tower one-machine thermal power generation system.

[0074] The nominal diameter of the third pipeline between the cold salt tank and the heat absorption tower is greater than the nominal diameter of the second pipeline between the steam generation system and the cold salt tank, and a flow valve is provided on the third pipeline.

[0075] Specifically, the nominal diameter of the third pipeline is greater than that of the second pipeline, which can adjust the storage space of the cold salt tank in real time. At the same time, it can adjust the conveying volume of the cold molten salt to a greater extent and is more adaptable to 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 third 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.

[0076] In this embodiment, the nominal diameter of the fifth pipeline between the steam generation system and the steam turbine generator set is greater than the nominal diameter of the sixth pipeline between the steam generation system and the steam turbine generator set.

[0077] Specifically, the nominal diameter of the fifth pipeline is larger than that of the sixth pipeline, which can adjust in real time the high-temperature steam flow rate of the high-temperature steam generated by the steam generation system entering the steam turbine generator set. This design can adjust the power generation efficiency in real time according to the working conditions of the steam turbine generator set, and can also transport the high-temperature steam generated by the steam generation system to the steam turbine generator set to the maximum extent, ultimately improving the working efficiency of the entire solar thermal power generation system.

[0078] In this embodiment, the nominal diameter of the fifth pipeline between the steam generation system and the steam turbine generator set is larger than the nominal diameter of the first pipeline between the heat salt tank and the steam generation system; and the nominal diameter of the first pipeline between the heat salt tank and the steam generation system is larger than the nominal diameter of the fourth pipeline between the heat salt tank and the heat absorber tower.

[0079] Specifically, the nominal diameter of the fifth pipeline is larger than that of the first pipeline, which can adjust in real time the high-temperature steam flow rate of the high-temperature steam generated by the steam generation system entering the steam turbine generator set. This design can adjust the power generation efficiency in real time according to the working conditions of the steam turbine generator set, and can also transport the high-temperature steam generated by the steam generation system to the steam turbine generator set to the maximum extent, ultimately improving the working efficiency of the entire solar thermal power generation system. The nominal diameter of the first pipeline is larger than that of the fourth pipeline, which can adjust the conveying flow rate of the high-temperature molten salt, and can also adjust the real-time storage space of the heat salt tank, effectively adjusting the efficiency of the entire solar thermal power generation system and controlling the flow profile of the molten salt in the overall system.

[0080] In this embodiment, the nominal diameter of the seventh pipeline between the relay tank and the heat absorber tower is larger than the nominal diameter of the eighth pipeline between the relay tank and the cold salt tank.

[0081] Specifically, the nominal diameter of the seventh pipeline is larger than that of the eighth pipeline, which can adjust in real time the storage capacity of the molten salt in the relay tank and the space of the relay tank, and can also transport the molten salt to the heat absorber to the maximum extent, improving the heat absorption efficiency of the heat absorber and ultimately effectively adjusting the efficiency of the entire solar thermal power generation system.

[0082] The specific embodiments of the present application are described above. Those skilled in the art can design devices such as butterfly valves, globe valves, check valves, control valves, and pumps on the pipeline according to different design requirements. At the same time, the number of heat absorber towers in the above embodiments is not specifically limited and can be multiple.

[0083] The present invention application does not limit the specific number of heat absorber towers. Each heat absorber tower can be arranged in combination with a cold salt tank or a heat salt tank according to specific circumstances. The ultimate purpose of the layout is to help improve the operating efficiency of the entire multi-tower one-machine thermal power generation system.

[0084] The above are only optional implementation manners of some implementation scenarios of the present application. It should be noted that for those of ordinary skill in the art, without departing from the technical concept of the solution of the present application, adopting other similar implementation means based on the technical idea of the present application also belongs to the protection scope of the embodiments of the present application.

Claims

1. A multi-tower one-machine solar thermal power generation system, characterized in that The system includes a solar tower, a heliostat field, a cold salt tank, a hot salt tank, a steam generation system, and a steam turbine generator set; The heliostat field reflects sunlight onto the absorber at the top of the solar tower, for heating the molten salt in the absorber; The cold salt tank is used for storing the low-temperature molten salt after heat exchange, and the cold salt tank transports the low-temperature molten salt to the absorber at the top of the solar tower through a low-temperature molten salt pump; The hot salt tank is used for storing the high-temperature molten salt heated by the absorber at the top of the solar 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 position distances between the steam generation system and each solar tower are all equal; The length of the first pipeline between the steam generation system and the hot salt tank is less than the length of the second pipeline between the steam generation system and the cold salt tank; The terrains of the cold salt tank and the hot salt tank are both lower than the terrain of the solar tower.

2. The multi-tower one-machine solar thermal power generation system according to claim 1, wherein A relay tank is arranged on the pipeline between the cold salt tank and the solar tower.

3. The multi-tower one-machine solar thermal power generation system according to claim 1, wherein The lengths of the third pipelines between the cold salt tank and the solar tower are all equal.

4. The multi-tower one-machine solar thermal power generation system according to claim 1 or 3, characterized in that The lengths of the fourth pipelines between the hot salt tank and the solar tower are all equal.

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

6. The multi-tower one-machine solar thermal power generation system according to claim 5, characterized in that, The length of the fourth pipeline between the hot salt tank and the solar tower is greater than the length of the first pipeline between the steam generation system and the hot salt tank.

7. The multi-tower one-machine solar thermal power generation system according to claim 6, wherein The position distances between the cold salt tank and the solar tower are all equal.

8. The multi-tower one-machine solar thermal power generation system according to claim 7, wherein, The position distances between the hot salt tank and the solar tower are all equal.

9. The multi-tower one-machine solar thermal power generation system according to claim 8, wherein, The position distance between the cold salt tank and the solar tower is greater than the position distance between the cold salt tank and the steam generation system.

10. The multi-tower one-machine solar thermal power generation system according to claim 9, characterized in that, The position distance between the hot salt tank and the solar tower is greater than the position distance between the steam generation system and the hot salt tank.

11. The multi-tower one-machine solar thermal power generation system according to claim 10, wherein The length of the fifth pipeline between the steam generation system and the steam turbine generator set is less than the length of the sixth pipeline between the steam generation system and the steam turbine generator set.

12. The multi-tower one-machine solar thermal power generation system according to claim 11, characterized in that, The area of the heliostat field is related to both the rated power of the solar tower and the height of the solar tower.

13. The multi-tower one-machine solar thermal power generation system according to claim 2, wherein A short-axis high-lift pump is arranged between the solar tower and the relay tank, and a long-axis low-lift pump is arranged between the relay tank and the cold salt tank.

14. The multi-tower one-machine solar thermal power generation system according to claim 11, wherein The nominal diameter of the third pipeline between the cold salt tank and the solar tower is greater than the nominal diameter of the second pipeline between the steam generation system and the cold salt tank, and a flow valve is arranged on the third pipeline.

15. The multi-tower one-machine solar thermal power generation system according to claim 13 or 14, wherein The nominal diameter of the fifth pipeline between the steam generation system and the steam turbine generator set is greater than the nominal diameter of the sixth pipeline between the steam generation system and the steam turbine generator set.

16. The multi-tower one-machine solar thermal power generation system according to claim 15, characterized in that The nominal diameter of the fifth pipeline between the steam generation system and the steam turbine generator set is larger than the nominal diameter of the first pipeline between the hot salt tank and the steam generation system; and the nominal diameter of the first pipeline between the hot salt tank and the steam generation system is larger than the nominal diameter of the fourth pipeline between the hot salt tank and the heat absorption tower.

17. The multi-tower one-machine solar thermal power generation system according to claim 16, wherein The positional distance between the relay tank and the heat absorption tower is less than the positional distance between the relay tank and the cold salt tank.

18. The multi-tower one-machine solar thermal power generation system according to claim 17, wherein The length of the seventh pipeline between the relay tank and the heat absorption tower is less than the length of the eighth pipeline between the relay tank and the cold salt tank.

19. The multi-tower-one-machine solar thermal power generation system according to claim 18, wherein The nominal diameter of the seventh pipeline between the relay tank and the heat absorption tower is larger than the nominal diameter of the eighth pipeline between the relay tank and the cold salt tank.

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