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. Each heat absorption tower corresponds to one set of cold salt tank and hot salt tank, and the terrains of the cold salt tanks and the hot salt tanks are lower than the terrains of the corresponding heat absorption towers; the first position distances between the steam generation system and the heat absorption towers are equal; and the length of the first pipeline between the hot salt tank and the steam generation system is smaller than that of the second pipeline between the steam generation system and the cold salt tank. 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 relates 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 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 an issue that the industry focuses on. At the same time, maintaining high-efficiency operation in the layout of the multi-tower-one-machine is also an issue that the industry focuses on. 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-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 and one-machine solar thermal power generation system, which includes an absorption 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 absorption tower for heating the low-temperature molten salt in the absorber; the cold salt tank is used to store the low-temperature molten salt after heat exchange, and the cold salt tank transports the low-temperature molten salt to the absorber at the top of the 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 absorber at the top of the 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 by the steam turbine generator set are transported to the steam generation system; each absorption tower corresponds to a set of cold salt tank and hot salt tank, and the terrain of the cold salt tank and the hot salt tank is lower than that of the corresponding absorption tower; the first position distances between the steam generation system and each absorption tower are all equal; the first pipeline length between the hot salt tank and the steam generation system is less than the second pipeline length between the steam generation system and the cold salt tank.

[0006] Further, the cold salt tank is connected to each absorption tower; the hot salt tank is connected to each absorption tower; the cold salt tanks are connected to each other; the hot salt tanks are connected to each other.

[0007] Further, the second pipeline lengths between the steam generation system and the cold salt tank are all equal.

[0008] Further, the first pipeline lengths between the hot salt tank and the steam generation system are all equal.

[0009] Further, the third pipeline length between the cold salt tank and the absorption tower is less than the fourth pipeline length between the hot salt tank and the absorption tower.

[0010] Further, the third pipeline length between the cold salt tank and the absorption tower is less than the second pipeline length between the steam generation system and the cold salt tank.

[0011] Further, the fourth pipeline length between the hot salt tank and the absorption tower is less than the first pipeline length between the steam generation system and the hot salt tank.

[0012] Further, 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.

[0013] Further, the second position distance between the cold salt tank and the absorption tower is less than the third position distance between the hot salt tank and the absorption tower.

[0014] Further, a fourth positional distance between the hot salt tank and the steam generation system is less than a fifth positional distance between the cold salt tank and the steam generation system.

[0015] Further, a nominal diameter of a third pipe between the cold salt tank and the heat absorption tower is greater than a nominal diameter of a second pipe between the steam generation system and the cold salt tank.

[0016] Further, a nominal diameter of a first pipe between the hot salt tank and the steam generation system is greater than a nominal diameter of a fourth pipe between the hot salt tank and the heat absorption tower.

[0017] Further, a relay tank is provided on a pipe between the cold salt tank and the heat absorption tower.

[0018] Further, lengths of second pipes between the steam generation system and the cold salt tank are equal.

[0019] Further, lengths of first pipes between the hot salt tank and the steam generation system are equal.

[0020] Further, a length of a fourth pipe between the hot salt tank and the heat absorption tower is less than a length of a first pipe between the steam generation system and the hot salt tank.

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

[0022] Further, a length of a fifth pipe between the steam generation system and the steam turbine generator set is less than a length of a sixth pipe between the steam generation system and the steam turbine generator set.

[0023] Further, a second positional distance between the cold salt tank and the heat absorption tower is less than a third positional distance between the hot salt tank and the heat absorption tower.

[0024] Further, a fourth positional distance between the hot salt tank and the steam generation system is less than a fifth positional distance between the cold salt tank and the steam generation system.

[0025] Further, a nominal diameter of a seventh pipe between the relay tank and the heat absorption tower is greater than a nominal diameter of an eighth pipe between the relay tank and the cold salt tank.

[0026] Further, a nominal diameter of a first pipe between the hot salt tank and the steam generation system is greater than a nominal diameter of a fourth pipe between the hot salt tank and the steam generation system.

[0027] To achieve the above object, 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 by power generation of the steam turbine generator set are transported to the steam generation system; each absorber tower corresponds to a set of cold salt tanks or a set of hot salt tanks respectively, and the terrain of the cold salt tank and the hot salt tank is lower than that of the corresponding absorber tower; the cold salt tank is connected to each absorber tower; the hot salt tank is connected to each absorber tower; the cold salt tanks are connected to each other; the hot salt tanks are connected to each other; the first position distances between the steam generation system and each absorber tower are equal; the first pipeline length between the hot salt tank and the steam generation system is less than the second pipeline length between the steam generation system and the cold salt tank.

[0028] Further, a relay tank is provided on the pipeline between the cold salt tank and the absorber tower.

[0029] Further, the second pipeline lengths between the steam generation system and the cold salt tanks are equal.

[0030] Further, the first pipeline lengths between the hot salt tank and the steam generation system are equal.

[0031] Further, the third pipeline length between the cold salt tank and the absorber tower corresponding to the cold salt tank is less than the second pipeline length between the steam generation system and the cold salt tank.

[0032] Further, the fourth pipeline length between the hot salt tank and the absorber tower corresponding to the hot salt tank is less than the first pipeline length between the steam generation system and the hot salt tank.

[0033] Further, 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.

[0034] Further, the fourth position distance between the hot salt tank and the steam generation system is less than the fifth position distance between the cold salt tank and the steam generation system.

[0035] Further, the nominal diameter of the third pipeline between the cold salt tank and the heat absorption tower is larger than the nominal diameter of the second pipeline between the steam generation system and the cold salt tank.

[0036] Further, 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.

[0037] Further, 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.

[0038] Further, 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.

[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 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

[0040] Figure 1 Schematic diagram 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 a multi-tower one-machine solar thermal power generation system provided in Embodiment 2 of the present invention.

[0042] Figure 3 Schematic diagram 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 a multi-tower one-machine solar thermal power generation system provided in Embodiment 4 of the present invention.

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

[0045] Figure 6 Schematic diagram of a multi-tower one-machine solar thermal power generation system provided in Embodiment 6 of the present invention.

[0046] 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 - shaft high - lift pump, 17 - Long - shaft low - lift pump, 18 - Absorber. Detailed implementation manners

[0047] 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 fall within the protection scope of the present invention.

[0048] Next, the technical solutions in the embodiments of the present application will be described with reference to the accompanying drawings in the embodiments of the present application. In the description of the present application, terms such as "first", "second", etc. are only used for distinguishing descriptions and cannot be understood as indicating or implying relative importance.

[0049] Some directional terms used to describe the accompanying 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 accompanying drawings. Unless otherwise specified, the directional terms described in this specification are basically in the conventional directions understood by those skilled in the art.

[0050] In the present invention, unless otherwise clearly defined and limited, terms such as "installed", "connected", "connected to", "fixed" and other terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of 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 situations.

[0051] Embodiment 1.

[0052] As Figure 1 shown, the present invention provides a multi - tower - one - machine solar thermal power generation system, and the system includes an absorption tower, a heliostat field, a cold salt tank, a hot salt tank, a steam generation system and a steam turbine generator set.

[0053] 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 fields between the solar towers. The shapes and areas of the shared 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 heliostat field and the layout and control of the shared 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.

[0054] 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.

[0055] 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 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 receiver at the top of the solar tower through a cold molten salt pump.

[0056] 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. 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.

[0057] 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; Each solar tower corresponds to a set of cold salt tank and hot salt tank (that is, a cold salt tank and a hot salt tank are respectively set under each solar tower). The terrains of the cold salt tank and the hot salt tank are both lower than the terrain of the corresponding 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.

[0058] In this embodiment, the first position distances between the steam generation system and each solar tower are all equal.

[0059] Specifically, the first position distance refers to the straight-line distance between the steam generation system and the solar tower. The example is as follows: The coordinates of the steam generation system are (X1, Y1, Z1), and the coordinates of the heat absorption tower are (X2, Y2, Z2). Then the distance of the first position is .

[0060] The design here is to arrange the steam generation system in the middle of the 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.

[0061] In this embodiment, the length of the first pipeline between the hot salt tank and the steam generation system is less than the length of the second pipeline between the steam generation system and the cold salt tank.

[0062] Specifically, the length of the first pipeline 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 length of the second pipeline refers to the pipeline length from the cold molten salt inlet of the cold salt tank to 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 allows the hot molten salt to enter the steam generation system hot in the first place, reduces the heat loss of the hot molten salt during transmission by reducing the length of the first pipeline, and reduces the pipeline utility cost at the same time. Ultimately, it helps improve the operating efficiency of the entire multi-tower one-machine thermal power generation system and reduces costs.

[0063] In this embodiment, the lengths of the second pipelines between the steam generation system and the cold salt tank are all equal.

[0064] Specifically, the length of the second pipeline refers to the pipeline length from the cold molten salt inlet of the cold salt tank to the cold molten salt outlet of the steam generation system. That is: the pipeline lengths from the cold molten salt inlet of the cold salt tank to the cold molten salt outlet of the steam generation system are all equal. The equal length of the second pipeline allows the relevant equipment (valves, pumps, etc.) installed on the second pipeline to use the same model, 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.

[0065] In this embodiment, the lengths of the first pipelines between the hot salt tank and the steam generation system are all equal.

[0066] Specifically, the length of the first pipeline 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. That is: the pipeline lengths from the hot molten salt outlet of the hot salt tank to the hot molten salt inlet of the steam generation system are all equal. The equal length of the first pipeline allows the relevant equipment (valves, pumps, etc.) installed on the first pipeline to use the same model, 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.

[0067] In this embodiment, the length of the third pipeline between the cold salt tank and the heat absorption tower is less than the length of the fourth pipeline between the hot salt tank and the heat absorption tower.

[0068] 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 cold molten salt inlet of the heat absorber at the top of the heat absorption tower. The length of the fourth 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 third pipeline is less than that of the fourth pipeline. Determining the position of the cold salt tank first helps reduce the pipe length for transporting cold molten salt to the heat absorber. This design can reduce the pipeline cost and also reduce the cold salt pump in the pipeline, ultimately reducing the cost of the entire system.

[0069] In this embodiment, the length of the third pipeline between the cold salt tank and the heat absorption tower is less than the length of the second pipeline between the steam generation system and the cold salt tank.

[0070] Specifically, the length of the third pipeline is less than that of the second pipeline (the cold salt tank is arranged as close as possible to the heat absorption tower). By reducing the length of the third pipeline, the pipe length between the cold salt tank and the heat absorber at the top of the heat absorption tower is minimized as much as possible, reducing the heat loss during molten salt transportation, shortening the time for molten salt to enter the heat absorber as much as possible, and at the same time reducing the pipeline usage cost. Ultimately, it helps improve the operation efficiency of the entire multi-tower one-unit thermal power generation system and reduce the cost.

[0071] In this embodiment, the length of the fourth pipeline between the hot salt tank and the heat absorption tower is less than the length of the first pipeline between the steam generation system and the hot salt tank.

[0072] Specifically, the length of the fourth pipeline is less than that of the first pipeline (the hot salt tank is arranged as close as possible to the heat absorption tower). By reducing the length of the fourth pipeline, the pipe length for transporting hot molten salt from the heat absorption tower to the hot salt tank is reduced, thereby reducing the heat loss of the hot molten salt during transmission, and at the same time reducing the pipeline practical cost. Ultimately, it helps improve the operation efficiency of the entire multi-tower one-unit thermal power generation system and reduce the cost.

[0073] 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.

[0074] 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 of the high-temperature steam transported to the steam turbine generator set is reduced, so that the high-temperature steam can enter the steam turbine generator set for power generation as soon as possible, reduce heat loss, improve power generation efficiency, and ultimately help improve the operating efficiency of the entire multi-tower one-machine thermal power generation system.

[0075] In this embodiment, the second position distance between the cold salt tank and the heat absorption tower is smaller than the third position distance between the hot salt tank and the heat absorption tower.

[0076] Specifically, the second position distance refers to the straight-line distance between the cold salt tank and the heat absorption tower. For example, 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 second position distance is The third position distance refers to the straight-line distance between the hot salt tank and the heat absorption tower. For example, the coordinates of the hot salt tank are (X4, Y4, Z4), and the coordinates of the heat absorption tower are (X2, Y2, Z2). .

[0077] The design here is to give priority to the position of the cold salt tank and shorten the second position distance between the cold salt tank and the 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.

[0078] In this embodiment, the fourth position distance between the hot salt tank and the steam generating system is smaller than the fifth position distance between the cold salt tank and the steam generating system.

[0079] Specifically, the fourth position distance refers to the straight-line distance between the hot salt tank and the steam generation system, as shown in the following example: The coordinates of the hot salt tank are (X4, Y4, Z4), and the coordinates of the steam generation system are (X1, Y1, Z1). The distance of the fourth position is .

[0080] The fifth position distance refers to the straight-line distance between the cold salt tank and the steam generation system, as shown below: The coordinates of the cold salt tank are (X3, Y3, Z3), and the coordinates of the steam generation system are (X1, Y1, Z1). The distance of the fifth position is .

[0081] The design here is to arrange the steam generation system near the hot salt tank, which helps to reduce the tube length of the molten salt input into the steam generation system, reduce heat loss, and deliver it to the steam generation system in the first time, improve the heat exchange rate of the steam generation system, and ultimately help to improve the operating efficiency of the entire multi-tower and one-machine thermal power generation system.

[0082] In this embodiment, the nominal diameter of the third pipeline between the cold salt tank and the heat absorber tower is larger than the nominal diameter of the second pipeline between the steam generation system and the cold salt tank.

[0083] Specifically, the nominal diameter of the third pipeline being larger 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 delivery volume of the cold molten salt to a greater extent, and better adapt to the adjustment of the real-time power of the heat absorber. That is, when the inlet and outlet flow rates 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.

[0084] In this embodiment, 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 absorber tower.

[0085] Specifically, the nominal diameter of the first pipeline being larger than that of the fourth pipeline can adjust the delivery 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 overall control the flow profile of the molten salt in the system.

[0086] Embodiment 2.

[0087] As Figure 2 shown, on the basis of Embodiment 1, the cold salt tank is connected to each heat absorber tower; the hot salt tank is connected to each heat absorber tower; the cold salt tanks are connected to each other; the hot salt tanks are connected to each other.

[0088] The above-mentioned cold salt tanks are connected to each heat absorber tower through the same pipeline, and at the same time, the above-mentioned cold salt tanks are connected to each other through pipelines. The design for the cold salt tanks makes each cold salt tank a backup for each other. At the same time, the pumps and valves on the cold salt tank pipeline can comprehensively adjust the flow rate of the cold molten salt entering the heat absorber tower and reasonably control the storage space of each cold salt tank.

[0089] The above-mentioned hot salt tanks are connected to each heat absorber tower through the same pipeline, and at the same time, the above-mentioned hot salt tanks are connected to each other through pipelines. The design for the hot salt tanks makes each hot salt tank a backup for each other. At the same time, the pumps and valves on the hot salt tank pipeline can comprehensively adjust the flow rate of the molten salt entering the hot salt tank and reasonably control the storage space of each hot salt tank.

[0090] In the multi-tower one-machine thermal power generation system proposed in the present invention, each heat absorption tower corresponds to a set of cold salt tank / thermal salt tank, and the cold salt tanks are backup to each other, and the thermal salt tanks are backup to each other. That is, in the entire multi-tower one-machine thermal power generation system, as long as only one cold salt tank and one thermal salt tank are working properly, the multi-tower one-machine thermal power generation system can operate normally, avoiding the shutdown of the entire multi-tower one-machine thermal power generation system, and effectively adjusting the efficiency of the entire solar thermal power generation system.

[0091] Embodiment 3.

[0092] As Figure 3 shown, on the basis of Embodiment 1, a relay tank is provided on the pipeline between the cold salt tank and the heat absorption tower. 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 cold salt tank and the relay tank. The layout of the above 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.

[0093] The quantities of the above 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.

[0094] 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.

[0095] 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, the pipe diameter of the cold molten salt input into the heat absorber can be reduced, and it can be transported to the heat absorption tower faster, which helps to improve the operation efficiency of the entire multi-tower one-machine thermal power generation system.

[0096] In this embodiment, the nominal diameter of the seventh pipeline between the relay tank and the heat absorption tower is greater than the nominal diameter of the eighth pipeline between the relay tank and the cold salt tank.

[0097] Specifically, the nominal diameter of the seventh pipeline is greater than the nominal diameter of the eighth pipeline, which can adjust the storage capacity of the molten salt in the relay tank and the space of the relay tank in real time, and at the same time can transport the molten salt to the heat absorber to the maximum extent, improve the heat absorption efficiency of the heat absorber, and finally effectively adjust the efficiency of the entire solar thermal power generation system.

[0098] Embodiment 4.

[0099] As Figure 4As shown, on the basis of Embodiment 2, a relay tank is provided on the pipelines between the cold salt tank and the heat absorption tower. 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 cold salt tank and the relay tank. The layout of the above 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 solar thermal power generation system.

[0100] The quantities of the above relay tank, short-axis high-lift pump, and long-axis low-lift pump are reasonably arranged according to the overall design, and no specific limitation is made here.

[0101] 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.

[0102] 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 of the cold molten salt input into the heat absorber, it can be transported to the heat absorption tower faster, which helps improve the operation efficiency of the entire multi-tower one-machine solar thermal power generation system.

[0103] In this embodiment, the nominal diameter of the seventh pipeline between the relay tank and the heat absorption tower is greater than the nominal diameter of the eighth pipeline between the relay tank and the cold salt tank.

[0104] Specifically, the nominal diameter of the seventh pipeline being greater than the nominal diameter 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, and at the same time can transport 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.

[0105] The multi-tower one-machine solar thermal power generation system in this embodiment combines the technical solutions of the cold salt tank and the hot salt tank being used as backups for each other and the solution of setting a relay tank between the heat absorption tower and the cold salt tank.

[0106] Embodiment 5.

[0107] As Figure 5 shown, the present invention provides a multi-tower one-machine solar thermal power generation system, and the system includes 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.

[0108] 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 each 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 fields among the solar towers. The shapes and areas of the shared 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 heliostat field and the layout and control of the shared field can effectively improve the light concentration 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.

[0109] 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.

[0110] 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 in the steam generation system and transports the heat-exchanged low-temperature molten salt to the cold salt tank through a second 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.

[0111] 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.

[0112] 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 condensed water generated by the power generation of the steam turbine generator set to the steam generation system.

[0113] Each solar tower corresponds to a set of cold salt tank and hot salt tank (that is, a cold salt tank and a hot salt tank are respectively set under each solar tower). The terrains of the cold salt tank and the hot salt tank are both lower than the terrain of the corresponding 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 save costs.

[0114] Each of the heat absorption towers corresponds to a set of cold salt tanks or a set of hot salt tanks respectively (i.e., a set of cold salt tanks or a set of hot salt tanks is arranged under each heat absorption tower), and the terrain of the cold salt tanks and the hot salt tanks is lower than that of the corresponding heat absorption towers; the cold salt tanks are connected to each of the heat absorption towers; the hot salt tanks are connected to each of the heat absorption towers; the cold salt tanks are connected to each other; the hot salt tanks are connected to each other.

[0115] The above-mentioned cold salt tanks are connected to the heat absorption towers through the same pipeline, and at the same time, the above-mentioned cold salt tanks are connected to each other through pipelines. The design for the cold salt tanks enables them to be used as backups for each other. Meanwhile, the flow rate of the cold molten salt entering the heat absorption towers can be comprehensively adjusted through the pumps and valves on the cold salt tank pipelines, and the storage space of each cold salt tank can be reasonably controlled.

[0116] The above-mentioned hot salt tanks are connected to the heat absorption towers through the same pipeline, and at the same time, the above-mentioned hot salt tanks are connected to each other through pipelines. The design for the hot salt tanks enables them to be used as backups for each other. Meanwhile, the flow rate of the hot molten salt entering the hot salt tanks can be comprehensively adjusted through the pumps and valves on the hot salt tank pipelines, and the storage space of each hot salt tank can be reasonably controlled.

[0117] In the multi-tower one-machine thermal power generation system proposed in the present invention, each heat absorption tower corresponds to a set of cold salt tanks / hot salt tanks, and the cold salt tanks are used as backups for each other, and the hot salt tanks are used as backups for each other. That is, in the entire multi-tower one-machine thermal power generation system, as long as there is and only one cold salt tank and one hot salt tank operating normally, the multi-tower one-machine thermal power generation system can operate normally, avoiding the shutdown of the entire multi-tower one-machine thermal power generation system, and effectively adjusting the efficiency of the entire solar thermal power generation system.

[0118] In this embodiment, the first position distances between the steam generation system and each heat absorption tower are all equal.

[0119] Specifically, the first position distance refers to the straight-line distance between the steam generation system and the heat absorption tower, and the example is as follows: The coordinates of the steam generation system are (X1, Y1, Z1), and the coordinates of the heat absorption tower are (X2, Y2, Z2), then the first position distance is 。

[0120] The design here is to arrange the steam generation system in the middle position of the heat absorption towers, 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.

[0121] In this embodiment, the length of the first pipeline between the hot salt tank and the steam generation system is less than the length of the second pipeline between the steam generation system and the cold salt tank.

[0122] Specifically, the first pipeline length refers to the pipeline length between the molten salt outlet of the hot salt tank and the molten salt inlet of the steam generation system. The second pipeline length refers to the pipeline length between the cold molten salt inlet of the cold salt tank and the cold molten salt outlet of the steam generation system. The first pipeline length being less than the second pipeline length allows the molten salt to enter the steam generation system hot in the first place. By reducing the first pipeline length, the heat loss of the molten salt during transmission is reduced, while the pipeline utility cost is reduced. Ultimately, it helps improve the operating efficiency of the entire multi-tower one-machine thermal power generation system and reduces costs.

[0123] In this embodiment, the second pipeline lengths between the steam generation system and the cold salt tank are all equal.

[0124] Specifically, the second pipeline length refers to the pipeline length between the cold molten salt inlet of the cold salt tank and the cold molten salt outlet of the steam generation system. That is: the pipeline lengths between the cold molten salt inlet of the cold salt tank and the cold molten salt outlet of the steam generation system are all equal. The equal second pipeline lengths allow the related equipment (valves, pumps, etc.) installed on the second pipeline to adopt the same model, simplifying the equipment specifications in the entire multi-tower one-machine thermal power generation system, effectively reducing costs, and saving the model selection time at the same time.

[0125] In this embodiment, the first pipeline lengths between the hot salt tank and the steam generation system are all equal.

[0126] Specifically, the first pipeline length refers to the pipeline length between the molten salt outlet of the hot salt tank and the molten salt inlet of the steam generation system. That is: the pipeline lengths between the molten salt outlet of the hot salt tank and the molten salt inlet of the steam generation system are all equal. The equal first pipeline lengths allow the related equipment (valves, pumps, etc.) installed on the first pipeline to adopt the same model, simplifying the equipment specifications in the entire multi-tower one-machine thermal power generation system, effectively reducing costs, and saving the model selection time at the same time.

[0127] In this embodiment, the third pipeline length between the cold salt tank and the corresponding heat absorption tower of the cold salt tank is less than the second pipeline length between the steam generation system and the cold salt tank.

[0128] Specifically, the third 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 heat absorber at the top of the heat absorption tower corresponding to the cold salt tank. The third pipeline length being less than the second pipeline length (placing the cold salt tank as close as possible to the heat absorption tower), by reducing the third pipeline length, the pipe length between the cold salt tank and the heat absorber at the top of the heat absorption tower is minimized as much as possible, reducing the heat loss during molten salt transportation, minimizing the time for the molten salt to enter the heat absorber as much as possible, while reducing the pipeline usage cost. Ultimately, it helps improve the operating efficiency of the entire multi-tower one-machine thermal power generation system and reduces costs.

[0129] In this embodiment, the length of the fourth pipeline between the hot salt tank and the heat absorption tower corresponding to the hot salt tank is less than the length of the first pipeline between the steam generation system and the hot salt tank.

[0130] Specifically, the length of the fourth pipeline refers to the pipeline length between the molten salt outlet of the heat absorber at the top of the heat absorption tower and the molten salt inlet of the hot salt tank. The length of the fourth pipeline is less than the length of the first pipeline (the hot salt tank is arranged as close as possible to the heat absorption tower). By reducing the length of the fourth pipeline, the pipe length for transporting the molten salt from the heat absorption tower to the hot salt tank is reduced, thereby reducing the heat loss of the molten salt during transmission and reducing the pipeline utility cost. Ultimately, it helps to improve the operating efficiency of the entire multi-tower one-machine thermal power generation system and reduce costs.

[0131] 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.

[0132] 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, the pipe length for transporting the high-temperature water vapor to the steam turbine generator set is reduced, enabling the high-temperature water vapor to enter the steam turbine generator set for power generation in the first instance, reducing heat loss, and improving power generation efficiency. Ultimately, it helps to improve the operating efficiency of the entire multi-tower one-machine thermal power generation system.

[0133] In this embodiment, the fourth position distance between the hot salt tank and the steam generation system is less than the fifth position distance between the cold salt tank and the steam generation system.

[0134] Specifically, the fourth position distance refers to the straight-line distance between the hot salt tank and the steam generation system, as exemplified below: If the coordinates of the hot salt tank are (X4, Y4, Z4) and the coordinates of the steam generation system are (X1, Y1, Z1), then the fourth position distance .

[0135] The fifth position distance refers to the straight-line distance between the cold salt tank and the steam generation system, as exemplified below: If the coordinates of the cold salt tank are (X3, Y3, Z3) and the coordinates of the steam generation system are (X1, Y1, Z1), then the fifth position distance .

[0136] The design here is to layout the steam generation system near the hot salt tank, which helps to reduce the tube pass of the hot molten salt input into the steam generation system, reduce heat loss, and convey it to the steam generation system in the first time, improve the heat exchange rate of the steam generation system, and ultimately contribute to improving the operation efficiency of the entire multi-tower one-machine thermal power generation system.

[0137] In this embodiment, the nominal diameter of the third pipeline between the cold salt tank and the heat absorption tower is larger than the nominal diameter of the second pipeline between the steam generation system and the cold salt tank.

[0138] Specifically, the nominal diameter of the third pipeline being larger 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 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, when 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 regulating role, protect the storage space of the cold salt tank, and maximize the heat absorption efficiency of the heat absorber.

[0139] In this embodiment, 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.

[0140] Specifically, the nominal diameter of the first pipeline being larger 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.

[0141] Embodiment 6.

[0142] As Figure 6 shown, on the basis of Embodiment 5, a relay tank is provided on the pipeline between the cold salt tank and the heat absorption tower. 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 cold salt tank and the relay tank. The layout of the above 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 contribute to improving the operation efficiency of the entire multi-tower one-machine thermal power generation system.

[0143] The quantities of the above 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.

[0144] 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.

[0145] 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 that of the eighth pipeline. By reducing the length of the seventh pipeline and thus reducing the tube pass 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 solar thermal power generation system.

[0146] 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.

[0147] 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 transport 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.

[0148] The multi-tower one-machine solar thermal power generation system in this embodiment combines the technical solutions of the cold salt tank and the hot salt tank being used as backups for each other and the solution of setting a relay tank between the heat absorption tower and the cold salt tank.

[0149] 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.

[0150] 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 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, which is used to heat the low-temperature molten salt in the receiver; The cold salt tank is used to store the low-temperature molten salt after heat exchange. The cold salt tank transports the low-temperature molten salt to the receiver at the top of the solar tower through a low-temperature molten salt pump; The hot salt tank is used to store the high-temperature molten salt heated by the receiver at the top of the solar tower. The hot salt tank transports the high-temperature molten salt to the steam generation system through a high-temperature molten salt pump; The steam generation system exchanges heat with the high-temperature molten salt from the hot salt tank, sends the generated high-temperature steam to the steam turbine generator set for power generation, and the water vapor and condensate generated after power generation by the steam turbine generator set are transported to the steam generation system; Each solar tower corresponds to a set of cold salt tank and hot salt tank, and the elevations of the cold salt tank and the hot salt tank are both lower than that of the corresponding solar tower; The first position distances between the steam generation system and each solar tower are all equal; The length of the first pipeline between the hot salt tank and the steam generation system is less than the length of the second pipeline between the steam generation system and the cold salt tank.

2. The multi-tower one-machine solar thermal power generation system according to claim 1, wherein The cold salt tank is connected to each solar tower; the hot salt tank is connected to each solar tower; the cold salt tanks are connected to each other; the hot salt tanks are connected to each other.

3. The multi-tower one-machine solar thermal power generation system according to claim 1 or 2, characterized in that, The lengths of the second pipelines between the steam generation system and the cold salt tank are all equal.

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

5. The multi-tower one-machine solar thermal power generation system according to claim 4, characterized in that The length of the third pipeline between the cold salt tank and the solar tower is less than the length of the fourth pipeline between the hot salt tank and the solar tower.

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

7. The multi-tower one-machine solar thermal power generation system according to claim 6, wherein, The length of the fourth pipeline between the hot salt tank and the solar tower is less than the length of the first pipeline between the steam generation system and the hot salt tank.

8. The multi-tower one-machine solar thermal power generation system according to claim 7, 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.

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

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 steam generation system is less than the fifth position distance between the cold salt tank and the steam generation system.

11. The multi-tower one-machine solar thermal power generation system according to claim 10, 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.

12. The multi-tower one-machine solar thermal power generation system according to claim 11, wherein 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 solar tower.

13. The multi-tower one-machine solar thermal power generation system according to claim 1 or 2, characterized in that A relay tank is provided on the pipeline between the cold salt tank and the solar tower.

14. The multi-tower one-machine solar thermal power generation system according to claim 13, wherein The lengths of the second pipelines between the steam generation system and the cold salt tank are all equal.

15. The multi-tower one-machine solar thermal power generation system according to claim 14, wherein The lengths of the first pipelines between the hot salt tank and the steam generation system are all equal.

16. The multi-tower one-machine solar thermal power generation system according to claim 15, wherein The length of the fourth pipeline between the hot salt tank and the heat absorption tower is less than the length of the first pipeline between the steam generation system and the hot 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 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.

19. The multi-tower one-machine solar thermal power generation system according to claim 18, wherein, The second position distance between the cold salt tank and the heat absorption tower is less than the third position distance between the hot salt tank and the heat absorption tower.

20. The multi-tower one-machine solar thermal power generation system according to claim 19, wherein The fourth position distance between the hot salt tank and the steam generation system is less than the fifth position distance between the cold salt tank and the steam generation system.

21. The multi-tower-one-machine solar thermal power generation system according to claim 20, wherein, The nominal diameter of the seventh pipeline between the relay tank and the heat absorption tower is greater than the nominal diameter of the eighth pipeline between the relay tank and the cold salt tank.

22. The multi-tower one-machine solar thermal power generation system according to claim 21, characterized in that, 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 steam generation system.

23. A multi-tower one-machine solar thermal power generation system, characterized in that, The system includes a heat absorption tower, a heliostat field, a cold salt tank, a hot salt tank, a steam generation system and a steam turbine generator set; The 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. 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 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 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. Each heat absorption tower corresponds to a set of cold salt tanks or a set of hot salt tanks, and the terrain of the cold salt tanks and hot salt tanks is lower than that of the corresponding heat absorption towers; the cold salt tanks are connected to each heat absorption tower; the hot salt tanks are connected to each heat absorption tower; the cold salt tanks are connected to each other; the hot salt tanks are connected to each other; The first position distances between the steam generation system and each heat absorption tower are all equal. The length of the first pipeline between the hot salt tank and the steam generation system is less than the length of the second pipeline between the steam generation system and the cold salt tank.

24. The multi-tower one-machine solar thermal power generation system according to claim 23, wherein, A relay tank is provided on the pipeline between the cold salt tank and the heat absorption tower.

25. The multi-tower one-machine solar thermal power generation system according to claim 23 or 24, characterized in that, The lengths of the second pipelines between the steam generation system and the cold salt tanks are all equal.

26. The multi-tower one-machine solar thermal power generation system according to claim 25, wherein, The lengths of the first pipelines between the hot salt tank and the steam generation system are all equal.

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 heat absorption tower corresponding to the cold salt tank is less than the length of the second pipeline between the steam generation system and the cold salt tank.

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

29. The multi-tower one-machine solar thermal power generation system according to claim 28, characterized in that, 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.

30. The multi-tower one-machine solar thermal power generation system according to claim 29, wherein The distance at the fourth position between the hot salt tank and the steam generation system is less than the distance at the fifth position between the cold salt tank and the steam generation system.

31. The multi-tower-one-machine solar thermal power generation system according to claim 30, wherein 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.

32. The multi-tower-one-machine solar thermal power generation system according to claim 31, wherein 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.

33. The multi-tower one-machine solar thermal power generation system according to claim 24, 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.

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

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