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 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 an issue focused on by the industry. At the same time, maintaining high-efficiency operation in the layout of the multi-tower-one-machine is also an issue focused on by the industry. Summary of the Invention

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

[0005] 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 at 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 at 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 at the top of the absorber tower, and the hot salt tank transports the high-temperature molten salt to the steam generation system through a high-temperature molten salt pump; the steam generation system exchanges heat with the high-temperature molten salt from the hot salt tank, sends the generated high-temperature steam to the steam turbine generator set for power generation, and the water vapor and condensate generated by the steam turbine generator set are transported to the steam generation system; the first position 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 less than the second pipeline length between the steam generation system and the cold salt tank; the first absorber tower is the absorber tower with the largest rated power of the absorber at 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, the third positional distance between the cold salt tank and the first heat absorption tower is less than the first positional distance between the cold salt tank and the steam generation system.

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

[0015] Further, the fifth pipe length between the steam generation system and the steam turbine generator set is less than the 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 the third pipe between the cold salt tank and the heat absorption tower is greater than the nominal diameter of the 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 the fifth pipe between the steam generation system and the steam turbine generator set is greater than the nominal diameter of the 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 the fourth pipe between the hot salt tank and the heat absorption tower.

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

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

[0022] Further, the nominal diameter of the seventh pipe 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: By optimizing the overall layout of the multi-tower one-machine solar thermal power generation system and designing 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 manner. 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 - First heat absorption tower, 2 - Second heat absorption tower, 3 - Heliostat field, 4 - Cold salt tank, 5 - Hot salt tank, 6 - Steam generation system, 7 - Steam turbine generator set, 8 - Relay tank, 9 - First pipeline, 10 - Second pipeline, 11 - Third pipeline, 12 - Fourth pipeline, 13 - Fifth pipeline, 14 - Sixth pipeline, 15 - Seventh pipeline, 16 - Eighth pipeline, 17 - Short-axis high-lift pump, 18 - Long-axis low-lift pump, 19 - Heat absorber. SPECIFIC IMPLEMENTATION MANNER

[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] Next, 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, 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 the directions involved when viewing the drawings normally. 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 or limited, terms such as "installation", "connection", "linkage", "fixation", etc. shall be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly linked or indirectly linked through an intermediate medium, and it can be the communication inside two components or the interaction relationship between two components, unless otherwise clearly limited. 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 shared mirror fields between the absorber towers. The shapes and areas of the shared 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 example, the layout of the mirror field and the layout and control of the shared mirror field can effectively improve the solar concentrating efficiency in the multi-tower one-machine solar thermal power generation system, thereby improving the operating efficiency of the entire system. 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 for cold salt tanks or multiple for 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 in the steam generation system, and the heat-exchanged low-temperature molten salt is transported to the cold salt tank through a second pipeline. The cold salt tank transports the low-temperature molten salt to the absorber at the top of the absorber tower through a cold molten salt pump.

[0036] The hot salt tank is used to store the 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 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 and 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, 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.

[0038] Combined with Figure 1 As shown, some specific terms involved in the present invention are explained as follows.

[0039] First solar tower: Sort the solar towers in the entire multi-tower and single-generator system. First, sort the solar towers in descending order according to the rated power of each solar tower; secondly, if there are solar towers with the same rated power among the solar towers, then sort them in ascending order according to the terrain where the solar tower is located. Select the solar tower with the largest rated power and the lowest terrain as the first solar tower, and the other solar towers are used as the second solar tower, the third solar tower, etc. according to the above logic. The specific examples are as follows.

[0040] For example, in a multi-tower and single-generator solar thermal power generation system involving 5 solar towers, sort the solar towers in descending order according to the rated power: Solar tower A, Solar tower B, Solar tower C, Solar tower D, Solar tower E; sort the solar towers in ascending order according to the terrain where the solar tower is located: Solar tower A, Solar tower C, Solar tower D, Solar tower E, Solar tower B.

[0041] According to the above logic, it can be known that: the first solar tower is solar tower A, the second solar tower is solar tower B, the third solar tower is solar tower C, the fourth solar tower is solar tower D, and the fifth solar tower is solar tower E.

[0042] If the rated powers of solar tower B and solar tower C are equal, since the terrain of solar tower C is lower than that of solar tower B, the second solar tower is solar tower C.

[0043] In short, the definition of the first to fifth solar towers should first consider the rated power of the solar tower, and then consider the terrain where the solar tower is located.

[0044] The above cold salt tank is lower than the terrain where the first solar tower is located, and the above hot salt tank is lower than the terrain where the second solar tower is located. This design can effectively use gravity to transport the high-temperature molten salt to the hot salt tank, saving the number of molten salt pumps and saving costs.

[0045] In this embodiment, the first positional distance between the steam generation system and the first heat absorption tower is equal to the second positional distance between the steam generation system and the second heat absorption tower.

[0046] Specifically, the first positional distance refers to the straight-line distance between the steam generation system and the first heat absorption tower, as exemplified below: If the coordinates of the steam generation system are (X1, Y1, Z1), the coordinates of the first heat absorption tower are (X2, Y2, Z2), and the coordinates of the second heat absorption tower are (X3, Y3, Z3), then the first positional distance is , and the second positional distance is .

[0047] The design here is to layout the steam generation system in the middle position between the first heat absorption tower and the second heat absorption tower, which helps with the selection of equipment on both sides, simplifies the equipment specifications in the entire multi-tower one-machine thermal power generation system, can effectively reduce costs, and saves the selection time at the same time.

[0048] In this embodiment, 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; Specifically, the first pipeline length refers to the pipeline length from the hot molten salt outlet of the hot salt tank to the hot molten salt inlet of the steam generation system, and the second pipeline length refers to the pipeline length from the cold molten salt outlet of the steam generation system to the cold molten salt inlet of the cold salt tank. With this design, the same type of pumps, valves and other equipment can be used on the first pipeline and the second pipeline, which simplifies the equipment specifications in the entire multi-tower one-machine thermal power generation system, can effectively reduce costs, and saves the selection time at the same time.

[0049] In this embodiment, the third pipeline length between the cold salt tank and the first heat absorption tower is less than the pipeline lengths between the cold salt tank and other heat absorption towers.

[0050] Specifically, the third pipeline length refers to the pipeline length from the cold molten salt outlet of the cold salt tank to the inlet of the heat absorber at the top of the heat absorption tower. The third pipeline length is less than the pipeline lengths between the cold salt tank and other heat absorption towers. By reducing the third pipeline length, the pipe length of the cold molten salt input into the heat absorber can be reduced, and it can be transported to the first heat absorption tower with the highest rated power faster, which helps to improve the operating efficiency of the entire multi-tower one-machine thermal power generation system.

[0051] In this embodiment, the fourth pipeline length between the hot salt tank and the second heat absorption tower is less than the pipeline distances between the hot salt tank and other heat absorption towers.

[0052] Specifically, the length of the fourth pipeline refers to the pipeline length between the outlet of the heat absorber at the top of the second heat absorption tower and the molten salt inlet of the hot salt tank. The length of the fourth pipeline is less than the pipeline length between the hot salt tank and other heat absorption towers. By reducing the length of the fourth pipeline, the pipe length for the molten salt to enter the hot salt tank is reduced, thereby reducing the heat loss of the molten salt during transmission, while reducing the pipeline utility cost. Ultimately, it helps to improve the operation efficiency of the entire multi-tower and single-machine thermal power generation system and reduce costs.

[0053] In this embodiment, the length of the third pipeline between the cold salt tank and the first heat absorption tower is less than the length of the second pipeline between the cold salt tank and the steam generation system.

[0054] Specifically, the length of the third pipeline is less than the length of the second pipeline. By reducing the length of the third pipeline, the pipe length for the cold molten salt to enter the heat absorber is minimized as much as possible, and it can be transported to the first heat absorption tower with the highest rated power faster, which helps to improve the operation efficiency of the entire multi-tower and single-machine thermal power generation system.

[0055] In this embodiment, the length of the fourth pipeline between the hot salt tank and the second heat absorption tower is less than the length of the first pipeline between the steam generation system and the hot salt tank.

[0056] Specifically, the length of the fourth pipeline is less than the length of the first pipeline. By reducing the length of the fourth pipeline, the pipe length for the molten salt to enter the hot salt tank is reduced, thereby reducing the heat loss of the molten salt during transmission, while reducing the pipeline utility cost. Ultimately, it helps to improve the operation efficiency of the entire multi-tower and single-machine thermal power generation system and reduce costs.

[0057] In this embodiment, the third position distance between the cold salt tank and the first heat absorption tower is less than the position distances between the cold salt tank and other heat absorption towers.

[0058] Specifically, the third position distance refers to the straight-line distance between the cold salt tank and the first heat absorption tower. The example is as follows: The coordinates of the cold salt tank are (X4, Y4, Z4), and the coordinates of the first heat absorption tower are (X2, Y2, Z2), then the first position distance is 。

[0059] The design here is to layout the cold salt tank near the first heat absorption tower, that is, near the heat absorption tower with the highest rated power, which helps to reduce the pipe length for the cold molten salt to enter the heat absorber and can be transported to the first heat absorption tower with the highest rated power faster, which helps to improve the operation efficiency of the entire multi-tower and single-machine thermal power generation system.

[0060] In this embodiment, the fourth position distance between the hot salt tank and the second heat absorption tower is less than the position distances between the hot salt tank and other heat absorption towers.

[0061] Specifically, the fourth position distance refers to the straight-line distance between the hot salt tank and the second heat absorber tower, as shown in the following example: If the coordinates of the hot salt tank are (X5, Y5, Z5) and the coordinates of the first heat absorber tower are (X2, Y2, Z2), then the first position distance is .

[0062] The design here is to arrange the hot salt tank near the second heat absorber tower, that is, near the heat absorber tower with a relatively high rated power, which helps to reduce the pipe length for transporting the molten salt to the hot salt tank, thereby reducing the heat loss of the molten salt during the transmission process, while reducing the pipeline utility cost, and ultimately helps to improve the operating efficiency of the entire multi-tower one-machine thermal power generation system and reduce costs.

[0063] In this embodiment, the third position distance between the cold salt tank and the first heat absorber tower is less than the first position distance between the cold salt tank and the steam generation system.

[0064] Specifically, the design here is to further arrange the cold salt tank near the first heat absorber tower, that is, near the heat absorber tower with the highest rated power, which helps to reduce the pipe length for the cold molten salt to enter the heat absorber and can be transported to the first heat absorber tower with the highest rated power faster, contributing to improving the operating efficiency of the entire multi-tower one-machine thermal power generation system.

[0065] In this embodiment, the fourth position distance between the hot salt tank and the second heat absorber tower is less than the second position distance between the steam generation system and the second heat absorber tower.

[0066] The design here is to arrange the hot salt tank near the second heat absorber tower (the design priority of the distance between the hot salt tank and the second heat absorber tower is higher than that between the steam generation system and the second heat absorber tower), that is, near the heat absorber tower with a relatively high rated power, which helps to reduce the pipe length for transporting the molten salt to the hot salt tank, thereby reducing the heat loss of the molten salt during the transmission process, while reducing the pipeline utility cost, and ultimately helps to improve the operating efficiency of the entire multi-tower one-machine thermal power generation system and reduce costs.

[0067] In this embodiment, the fifth pipeline length between the steam generation system and the steam turbine generator set is less than the sixth pipeline length between the steam generation system and the steam turbine generator set.

[0068] Specifically, the fifth pipeline length refers to the pipeline length between the high-temperature steam outlet of the steam generation system and the inlet of the steam turbine generator set. The sixth pipeline length refers to the pipeline length between the outlet of the steam turbine generator set and the inlet of the steam generation system. The fifth pipeline length is less than the sixth pipeline length. By reducing the fifth pipeline length, the pipe length for transporting the high-temperature steam to the steam turbine generator set can be reduced, enabling the high-temperature steam to enter the steam turbine generator set for power generation in the first time.

[0069] Example 2

[0070] As Figure 2 shown, on the basis of Example 1, a relay tank is added between the heat absorption tower and the cold salt tank, a short-axis high-lift pump is arranged between the heat absorption tower and the relay tank, and a long-axis low-lift pump is arranged between the relay tank and the cold salt tank.

[0071] 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 operation efficiency of the entire multi-tower one-machine thermal power generation system.

[0072] The quantities of the above-mentioned relay tank, short-axis high-lift pump and long-axis low-lift pump are reasonably arranged according to the overall design, and specific limitations are not made here.

[0073] In this embodiment, the fifth position distance between the relay tank and the heat absorption tower is less than the sixth position distance between the relay tank and the cold salt tank.

[0074] Specifically, the fifth position distance refers to the straight-line distance between the relay tank and the heat absorption tower, and the sixth position distance refers to the straight-line distance between the relay tank and the cold salt tank. The example is as follows: The coordinates of the cold salt tank are (X4, Y4, Z4), the coordinates of the relay tank are (X6, Y6, Z6), and the coordinates of the heat absorption tower are (X7, Y7, Z7). Among them, the coordinates of the heat absorption tower are the target of the heat absorption tower in the entire heat absorption system in general. In some cases, it is the same as the coordinates (X2, Y2, Z2) of the first heat absorption tower and the coordinates (X3, Y3, Z3) of the second heat absorption tower.

[0075] Then the fifth position distance is ; The sixth position distance is ; The design here is to arrange the relay tank as close as possible to the heat absorption tower, select a suitable short-axis high-lift pump, improve the conveying efficiency of the cold molten salt, help increase the heat absorption efficiency, ultimately help improve the operation efficiency of the entire multi-tower one-machine thermal power generation system, and reduce costs.

[0076] In this embodiment, the seventh pipe length between the relay tank and the heat absorption tower is less than the eighth pipe length between the relay tank and the cold salt tank.

[0077] 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 tenth pipeline refers to the pipeline length between the cold molten salt outlet of the cold salt tank and the inlet of the relay tank. The length of the ninth pipeline is less than that of the tenth pipeline. By reducing the length of the ninth pipeline and thus reducing the tube pass of the cold molten salt input into the heat absorber, it can be transported to the heat absorption tower faster, which helps to improve the operating efficiency of the entire multi-tower and one-unit solar thermal power generation system.

[0078] Embodiment 3.

[0079] As Figure 1 - Figure 2 shown, on the basis of Embodiment 1 and Embodiment 2, optimizing the nominal diameter of the pipelines of the multi-tower and one-unit solar thermal power generation system helps to improve the operating efficiency of the entire multi-tower and one-unit solar thermal power generation system.

[0080] 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.

[0081] Specifically, the nominal diameter of the third pipeline being greater than that of the second pipeline can adjust the storage space of the cold salt tank in real time, and at the same time can adjust the conveying amount 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 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.

[0082] 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 first pipeline between the hot salt tank and the steam generation system; and the nominal diameter of the first pipeline between the hot salt tank and the steam generation system is greater than the nominal diameter of the fourth pipeline between the hot salt tank and the heat absorption tower.

[0083] Specifically, the nominal diameter of the fifth pipeline being greater than that of the first pipeline can adjust the high-temperature steam flow rate of the high-temperature steam generated by the steam generation system entering the steam turbine generator set in real time. This design can adjust the power generation efficiency according to the working conditions of the steam turbine generator set, and can also transport the high-temperature steam generated by the steam generation system to the steam turbine generator set to the greatest extent, and ultimately improve the working efficiency of the entire solar thermal power generation system. The nominal diameter of the first pipeline being greater than that of the fourth pipeline can adjust the conveying flow rate of the high-temperature molten salt, and at the same time can adjust the real-time storage space of the hot salt tank, effectively adjust the efficiency of the entire solar thermal power generation system, and can overall control the flow profile of the hot molten salt in the system.

[0084] In this embodiment, 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.

[0085] Specifically, the nominal diameter of the seventh pipeline being larger than that of the eighth pipeline can adjust the storage capacity of the molten salt in the relay tank and the space of the relay tank in real time. At the same time, it can convey the molten salt to the heat absorber to the maximum extent, improve the heat absorption efficiency of the heat absorber, and ultimately effectively adjust the efficiency of the entire solar thermal power generation system.

[0086] The specific embodiments of the present application have been described above. Those skilled in the art can design devices such as butterfly valves, globe valves, check valves, control valves, and pumps on the pipeline according to different design requirements. At the same time, the number of heat absorption towers in the above embodiments is not specifically limited and can be multiple.

[0087] The present invention application does not limit the specific number of heat absorption towers. Each heat absorption tower can be arranged in combination with a cold salt tank or a hot 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.

[0088] 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, using other similar implementation means based on the technical idea of the present application also belongs to the protection scope of the embodiments of the present application.

Claims

1. A multi-tower one-machine solar thermal power generation system, characterized in that, The system includes a solar tower, a heliostat field, a cold salt tank, a hot salt tank, a steam generation system, and a steam turbine generator set; The heliostat field reflects sunlight onto the receiver at the top of the solar tower to heat the low-temperature molten salt in the receiver; The cold salt tank is used to store the low-temperature molten salt after heat exchange. The cold salt tank transports the low-temperature molten salt to the receiver at the top of the solar tower through a low-temperature molten salt pump; The hot salt tank is used to store the high-temperature molten salt heated by the receiver at the top of the solar tower. The hot salt tank transports the high-temperature molten salt to the steam generation system through a high-temperature molten salt pump; The steam generation system exchanges heat with the high-temperature molten salt from the hot salt tank, sends the generated high-temperature steam to the steam turbine generator set for power generation, and transports the water vapor and condensate generated after power generation by the steam turbine generator set to the steam generation system; The first position distance between the steam generation system and the first solar tower is equal to the second position distance between the steam generation system and the second solar tower; The first pipeline length between the steam generation system and the hot salt tank is less than the second pipeline length between the steam generation system and the cold salt tank; The first solar tower is the solar tower with the largest rated power of the receiver at the top of the solar tower and the lowest terrain; 2. The multi-tower one-machine solar thermal power generation system according to claim 1, wherein A relay tank is provided on the pipeline between the cold salt tank and the solar tower; 3. The multi-tower one-machine solar thermal power generation system according to claim 1, characterized in that, The third pipeline length between the cold salt tank and the first solar tower is less than the pipeline lengths between the cold salt tank and other solar towers; 4. The multi-tower one-machine solar thermal power generation system according to claim 1 or 3, characterized in that, The fourth pipeline length between the hot salt tank and the second solar tower is less than the pipeline distances between the hot salt tank and other solar towers; 5. The multi-tower one-machine solar thermal power generation system according to claim 4, wherein, The third pipeline length between the cold salt tank and the first solar tower is less than the second 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 5, wherein The fourth pipeline length between the hot salt tank and the second solar tower is less than the first pipeline length 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, characterized in that, The third position distance between the cold salt tank and the first solar tower is less than the position distances between the cold salt tank and other solar towers; 8. The multi-tower one-machine solar thermal power generation system according to claim 7, wherein, The fourth position distance between the hot salt tank and the second solar tower is less than the position distances between the hot salt tank and other solar towers; 9. The multi-tower one-machine solar thermal power generation system according to claim 8, wherein, The third position distance between the cold salt tank and the first solar tower is less than the first 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 fourth position distance between the hot salt tank and the second solar tower is less than the second position distance between the steam generation system and the second solar tower; 11. The multi-tower one-machine solar thermal power generation system according to claim 10, wherein, The fifth pipeline length between the steam generation system and the steam turbine generator set is less than the sixth pipeline length 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, wherein, 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 provided between the solar tower and the relay tank, and a long-axis low-lift pump is provided between the relay tank and the cold salt tank; 14. The multi-tower one-machine solar thermal power generation system according to claim 13, 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 provided on the third pipeline.

15. The multi-tower one-machine solar thermal power generation system according to claim 14, wherein 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.

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

17. The multi-tower one-machine solar thermal power generation system according to claim 16, 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.

18. The multi-tower one-machine solar thermal power generation system according to claim 17, 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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