Disc type photo-thermal device and power generation system

Abstract

The invention relates to a disc type photo-thermal device and a power generation system, and the disc type photo-thermal device comprises a disc type light condensation module, a heat storage module, a first gas flow path, a heat end and heat storage module, a steam generation and overheating module, a second gas flow path, a steam generation and overheating module, and a heat exchange module, the first gas flow path is communicated with the steam generation and overheating module in an on-off mode, the second gas flow path is communicated with the steam generation and overheating module in an on-off mode, the third gas flow path is communicated with the first gas flow path and the second gas flow path in an on-off mode, the fourth gas flow path is communicated with the cold end of the steam generation and overheating module and the disc type light condensation module, and the fifth gas flow path is communicated with the heat storage module and the fourth gas flow path. And the water tank is in fluid communication with the steam generation and overheating module through a first liquid flow path in an on-off manner. According to the technical scheme, the disc type photo-thermal device and the power generation system can solve the technical problem that cogeneration cannot be continuously and stably carried out after the disc type condenser and the power generator are decoupled.

Description

Technical Field

[0001] The present disclosure relates to the technical field of energy storage, and specifically, to a dish solar thermal device and a power generation system. Background Art

[0002] In the related art, most of the dish solar thermal devices are coupled with Stirling generators and do not configure a heat storage module. A small part can configure a heat storage module in the system where the dish concentrator is coupled with the Stirling generator, but ultimately the energy is output through the Stirling generator; there is also a small part of dish solar thermal devices that decouple the dish concentrator from the Stirling generator to achieve the output of steam from the solar thermal device, but usually do not configure a heat storage module and cannot achieve continuous output of thermal energy. Summary of the Invention

[0003] The purpose of the present disclosure is to provide a dish solar thermal device and a power generation system to solve the technical problem that after the dish concentrator is decoupled from the Stirling generator, continuous and stable combined heat and power generation cannot be achieved.

[0004] To achieve the above object, according to the first aspect of the present disclosure, there is provided a dish solar thermal device, including: a dish concentrator module; a heat storage module, disposed downstream of the dish concentrator module along the flow direction of the gas medium; a first gas flow path, communicably connected between the hot end of the dish concentrator module and the heat storage module in a switchable manner, so that the gas medium exchanges the thermal energy of the dish concentrator module to the heat storage medium of the heat storage module; a steam generation and superheating module, disposed downstream of the dish concentrator module along the flow direction of the gas medium; a second gas flow path, parallel to the first gas flow path and communicably connected between the hot end of the dish concentrator module and the steam generation and superheating module in a switchable manner, so that the gas medium exchanges the thermal energy of the dish concentrator module to the steam generation and superheating module; a third gas flow path, communicably connected between the first gas flow path and the second gas flow path in a switchable manner, so that the gas medium exchanges the thermal energy in the heat storage module to the steam generation and superheating module; a fourth gas flow path, connected between the steam generation and superheating module and the cold end of the dish concentrator module to transport the gas medium back to the dish concentrator module; a fifth gas flow path, connected between the heat storage module and the fourth gas flow path; and a water tank, fluidly connected to the steam generation and superheating module in a switchable manner through a first liquid flow path to transport the water in the water tank to the steam generation and superheating module for heat exchange to form high-temperature steam.

[0005] Optionally, a first heat exchanger is provided on the fourth gas flow path, and the water tank is further fluidly connected to the first heat exchanger through a first liquid circuit so that the water in the water tank exchanges heat with the first heat exchanger.

[0006] Optionally, a blower is further provided on the fourth gas flow path, and the blower is arranged downstream of the first heat exchanger along the flow direction of the gas medium.

[0007] Optionally, the fifth gas flow path includes: a first branch of the fifth gas flow path, which is communicably connected between the heat storage module and the upstream of the first heat exchanger in a switchable manner, and a second branch of the fifth gas flow path, which is communicably connected between the heat storage module and the downstream of the blower in a switchable manner.

[0008] Optionally, a filter is further provided on the fourth gas flow path, and the filter is arranged between the first heat exchanger and the blower.

[0009] Optionally, the dish-shaped concentrating module includes a second heat exchanger and a plurality of dish-shaped concentrators. After being connected in series and / or in parallel, the plurality of dish-shaped concentrators are in fluid communication with the second heat exchanger through a first gas circuit, and each dish-shaped concentrator is respectively in fluid communication with the second heat exchanger in a switchable manner. The gas media in the first gas flow path, the second gas flow path, and the fourth gas flow path can exchange heat with the second heat exchanger.

[0010] Optionally, the heat storage module includes a plurality of solar thermal energy storage devices containing the heat storage medium, and the plurality of solar thermal energy storage devices are connected in series and / or in parallel.

[0011] Optionally, the steam generation and superheating module includes a superheater and an evaporator connected in series or in parallel, and the first liquid flow path sequentially passes through the evaporator and the superheater along the water flow direction.

[0012] Optionally, the gas medium is an inert gas, and the heat storage medium is a solid material or a phase change material.

[0013] According to a second aspect of the present disclosure, a power generation system is provided, including the dish-shaped solar thermal device in the above technical solution, as well as a steam turbine and a generator. The steam turbine is in fluid communication with the steam generation and superheating module through a second liquid flow path to receive the high-temperature steam, and the generator is connected to the steam turbine.

[0014] Through the above technical solution, in the dish-type solar thermal device provided by the present disclosure, the steam generation and superheating module and the heat storage module are connected in parallel downstream of the hot end of the dish-type concentrating module. When there is sufficient sunlight during the day, a part of the heat of the dish-type concentrating module can be exchanged through the gas medium flowing in the first gas flow path and stored in the heat storage medium of the heat storage module, and another part of the heat can be exchanged through the gas medium flowing in the second gas flow path to the steam generation and superheating module, where it is used to exchange heat with the water from the water tank in the first liquid flow path to form high-temperature steam, and finally it can be supplied to the steam turbine in the power generation system through the second liquid flow path for power generation. When there is no sunlight at night, the heat storage module can supply the heat in the heat storage medium to the steam generation and superheating module through the third gas flow path, so that the dish-type solar thermal device can also output high-temperature steam during the night without sunlight, thereby enabling the dish-type solar thermal device to be used for stable and continuous co-generation of heat and power throughout the day. The power generation system provided by the present disclosure has the same technical effects as the dish-type solar thermal device in the above technical solution, and in order to avoid unnecessary repetition, it will not be elaborated here.

[0015] Other features and advantages of the present disclosure will be described in detail in the subsequent specific implementation part. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings are used to provide a further understanding of the present disclosure, and constitute a part of the specification. Together with the following specific implementation, they are used to explain the present disclosure, but do not constitute a limitation to the present disclosure. In the drawings:

[0017] Figure 1 It is a schematic structural diagram of the dish-type solar thermal device and the power generation system in the specific implementation of the present disclosure.

[0018] DESCRIPTION OF THE REFERENCE NUMERALS

[0019] 1 - Dish-type concentrating module, 10 - First gas circuit, 11 - Second heat exchanger, 12 - Dish-type concentrator, 13 - Seventh valve, 14 - Eighth valve,

[0020] 2 - Heat storage module, 21 - Solar thermal energy storage device,

[0021] 3 - Steam generation and superheating module, 31 - Superheater, 32 - Evaporator,

[0022] 4 - Water tank, 41 - First liquid flow path, 42 - First water pump, 43 - First liquid circuit, 44 - Second water pump, 45 - Sixth valve,

[0023] 5 - Steam turbine, 51 - Second liquid flow path,

[0024] 6 - First heat exchanger,

[0025] 7 - Fan,

[0026] 8 - Filter

[0027] 91 - First gas flow path, 911 - First valve, 92 - Second gas flow path, 921 - Second valve, 93 - Third gas flow path, 931 - Third valve, 94 - Fourth gas flow path, 95 - Fifth gas flow path, 951 - First branch of the fifth gas flow path, 952 - Second branch of the fifth gas flow path, 953 - Fourth valve, 954 - Fifth valve

[0028] 100 - Generator Detailed implementation manners

[0029] The following will describe in detail the specific implementation manners of the present disclosure with reference to the accompanying drawings. It should be understood that the specific implementation manners described herein are only for the purpose of illustration and explanation of the present disclosure, and are not used to limit the present disclosure

[0030] In the present disclosure, unless otherwise stated, the orientation terms such as "upstream, downstream" generally refer to upstream and downstream along the flow direction of the gas medium or water, that is, the gas medium or water flows from upstream to downstream, and "inside, outside" refer to the direction relative to the contour of the corresponding component itself. The terms "first", "second", etc. used in the present disclosure are used to distinguish one element from another element, and do not have sequentiality and importance. In addition, in the following description with reference to the drawings, the same reference numerals in different drawings represent the same elements

[0031] According to the first aspect of the specific implementation manner of the present disclosure, a dish - type solar thermal device is provided. Refer to Figure 1As shown, the dish-type solar thermal device may include a dish-type concentrator module 1, a heat storage module 2, a steam generation and superheating module 3, and a water tank 4. The heat of the dish-type concentrator module 1 can be exchanged to the heat storage module 2 and / or the steam generation and superheating module 3 through a gas medium. The water in the water tank 4 can flow through the steam generation and superheating module 3 to become high-temperature steam. Specifically, the heat storage module 2 can be arranged downstream of the dish-type concentrator module 1 along the flow direction of the gas medium. A first gas flow path 91 can be communicably connected between the hot end of the dish-type concentrator module 1 and the heat storage module 2 in a switchable manner, so that the gas medium exchanges the thermal energy of the dish-type concentrator module 1 to the heat storage medium of the heat storage module 2. The steam generation and superheating module 3 can be arranged downstream of the dish-type concentrator module 1 along the flow direction of the gas medium. A second gas flow path 92 parallel to the first gas flow path 91 can be communicably connected between the hot end of the dish-type concentrator module 1 and the steam generation and superheating module 3 in a switchable manner, so that the gas medium exchanges the thermal energy of the dish-type concentrator module 1 to the steam generation and superheating module 3. A third gas flow path 93 can be communicably connected between the first gas flow path 91 and the second gas flow path 92 in a switchable manner, so that the gas medium exchanges the thermal energy in the heat storage module 2 to the steam generation and superheating module 3. The water tank 4 can be fluidly connected to the steam generation and superheating module 3 in a switchable manner through a first liquid flow path 41 to transport the water in the water tank 4 to the steam generation and superheating module 3 for heat exchange to form high-temperature steam. A fourth gas flow path 94 can be connected between the steam generation and superheating module 3 and the cold end of the dish-type concentrator module 1 to transport the gas medium back to the dish-type concentrator module 1. A fifth gas flow path 95 can be connected between the heat storage module 2 and the fourth gas flow path 94. When the dish-type concentrator module 1 charges the heat storage module 2 through the first gas flow path 91, the gas medium flowing through the heat storage module 2 can flow back to the dish-type concentrator module 1 through the fifth gas flow path 95 and the fourth gas flow path 94 in sequence. When the heat storage module 2 supplies heat to the steam generation and superheating module 3 through the third gas flow path 93, the gas medium flowing through the steam generation and superheating module 3 can flow back to the heat storage module 2 through the fourth gas flow path 94 and the fifth gas flow path 95 in sequence. That is to say, according to different working conditions, the flow direction of the gas medium in the fifth gas flow path 95 is different, that is, the single-channel fifth gas flow path 95 has the function of a two-way gas flow path.

[0032] Through the above technical solution, in the dish-type solar thermal device provided by the present disclosure, the steam generation and superheating module 3 and the heat storage module 2 are connected in parallel downstream of the hot end of the dish-type concentrating module 1. When there is sufficient sunlight during the day, a part of the heat of the dish-type concentrating module 1 can be exchanged through the gas medium flowing in the first gas flow path 91 and stored in the heat storage medium of the heat storage module 2, and another part of the heat can be exchanged through the gas medium flowing in the second gas flow path 92 to the steam generation and superheating module 3, which is used to exchange heat with the water from the water tank 4 in the first liquid flow path 41 to form high-temperature steam, and finally can be supplied to the steam turbine 5 in the power generation system through the second liquid flow path 51 for power generation. When there is no sunlight at night, the heat storage module 2 can supply the heat in the heat storage medium to the steam generation and superheating module 3 through the third gas flow path 93, so that the dish-type solar thermal device can also output high-temperature steam during the night without sunlight, thereby enabling the dish-type solar thermal device to be used for stable and continuous cogeneration throughout the day.

[0033] Refer to Figure 1 As shown, in order to realize the on-off of each flow path, a first valve 911 can be provided on the first gas flow path 91, a second valve 921 can be provided on the second gas flow path 92, the third gas flow path 93 can be connected between the downstream of the first valve 911 and the downstream of the second valve 921, a third valve 931 can be provided on the third gas flow path 93, a sixth valve 45 is provided on the first liquid flow path 41, and an eighth valve 14 is further provided at the hot end of the dish-type concentrating module 1 to control the fluid connection between the hot end of the dish-type concentrating module 1 and the first gas flow path 91 and the second gas flow path 92.

[0034] In order to make full use of the waste heat of the gas medium, refer to Figure 1 As shown, a first heat exchanger 6 can be provided on the fourth gas flow path 94, and the water tank 4 can also be fluidly connected to the first heat exchanger 6 through the first liquid circuit 43, so that the water in the water tank 4 exchanges heat with the first heat exchanger 6. The gas medium after charging heat for the heat storage module 2 and the gas medium after exchanging heat with the steam generation and superheating module 3 can both flow through the first heat exchanger 6 and preheat the water in the first liquid circuit 43 through the first heat exchanger 6.

[0035] In order to drive the water in the water tank 4 to flow through the first liquid flow path 41 to the steam generation and superheating module 3, refer to Figure 1 As shown, a first water pump 42 can be provided on the first liquid flow path 41. In order to drive the water in the water tank 4 to exchange heat with the first heat exchanger 6 through the first liquid circuit 43, refer to Figure 1 As shown, a second water pump 44 can be provided on the first liquid circuit 43.

[0036] In order to drive the flow of the gas medium, refer to Figure 1As shown, a fan 7 may also be provided on the fourth gas flow path 94. Along the flow direction of the gas medium, the fan 7 may be provided downstream of the first heat exchanger 6, and the first heat exchanger 6 can adjust the temperature of the gas medium entering the fan 7. A plurality of fans 7 connected in series and / or in parallel may be provided on the fourth gas flow path 94, and among them, a part of the fans 7 may be used as spares.

[0037] Reference Figure 1 As shown, the fifth gas flow path 95 may include a first branch 951 of the fifth gas flow path and a second branch 952 of the fifth gas flow path. Among them, the first branch 951 of the fifth gas flow path is communicably connected between the heat storage module 2 and the upstream of the first heat exchanger 6, and a fourth valve 953 is provided on the first branch 951 of the fifth gas flow path. The second branch 952 of the fifth gas flow path is communicably connected between the heat storage module 2 and the downstream of the fan 7, and a fifth valve 954 is provided on the second branch 952 of the fifth gas flow path. When the dish concentrator module 1 heats the heat storage module 2 through the first gas flow path 91, the fourth valve 953 is opened and the fifth valve 954 is closed. The gas medium flowing through the heat storage module 2 can flow back to the dish concentrator module 1 through the first branch 951 of the fifth gas flow path and the fourth gas flow path 94 in sequence. When the heat storage module 2 supplies heat to the steam generation and superheating module 3 through the third gas flow path 93, the fourth valve 953 is closed and the fifth valve 954 is opened. The gas medium flowing through the steam generation and superheating module 3 can flow back to the heat storage module 2 through the fourth gas flow path 94 and the second branch 952 of the fifth gas flow path in sequence.

[0038] In addition, reference Figure 1 As shown, a filter 8 may also be provided on the fourth gas flow path 94. The filter 8 is provided between the first heat exchanger 6 and the fan 7 to filter impurities in the gas medium.

[0039] Reference Figure 1As shown, in the specific embodiments of the present disclosure, the dish concentrator module 1 may include a second heat exchanger 11 and a plurality of dish concentrators 12. The plurality of dish concentrators 12 may be connected in series and / or in parallel and then fluidly connected to the second heat exchanger 11 through a first gas circuit 10. Each dish concentrator 12 may be fluidly connected to the second heat exchanger 11 in a switchable manner through the opening and closing of a seventh valve 13. The gas media in the first gas flow path 91, the second gas flow path 92, and the fourth gas flow path 94 can exchange heat with the second heat exchanger 11. On one side of the second heat exchanger 11, the gas media can export the heat in the plurality of dish concentrators 12 to the second heat exchanger 11 through the first gas circuit 10. Since the working pressure of the gas media in the first gas circuit 10 is relatively high, this side of the second heat exchanger 11 is simply referred to as the high-pressure side. On the other side of the second heat exchanger 11, the fourth gas flow path 94 is connected to the cold end of the second heat exchanger 11, so that the gas media with a relatively low working pressure enters the second heat exchanger 11. This side is simply referred to as the low-pressure side. The second heat exchanger 11 exports the heat on the high-pressure side to the low-pressure side to increase the temperature of the gas media on the low-pressure side, and then the gas media flows out from the hot end of the second heat exchanger 11. That is to say, there are two non-connected gas flow paths in the dish concentrator module 1 to solve the problem of its own pressure drop and pressure rise.

[0040] Reference Figure 1 As shown, the heat storage module 2 may include a plurality of solar thermal energy storage devices 21 containing a heat storage medium. The plurality of solar thermal energy storage devices 21 may be connected in series and / or in parallel. The steam generation and superheating module 3 may include a superheater 31 and an evaporator 32 connected in series or in parallel. Along the water flow direction, the first liquid flow path 41 may sequentially pass through the evaporator 32 and the superheater 31. When there is no sunlight at night, as an option, part of the plurality of solar thermal energy storage devices 21 may supply heat to the superheater 31, and the other part may supply heat to the evaporator 32. As another option, the heat of the plurality of solar thermal energy storage devices 21 may be combined and output to the steam generation and superheating module 3, and then the heat may be distributed to the superheater 31 and the evaporator 32 in a preset ratio.

[0041] In the specific embodiments of the present disclosure, the gas media may be an inert gas, such as nitrogen, etc., and the heat storage medium may be a solid material or a phase change material.

[0042] In the specific embodiments of the present disclosure, the dish solar thermal device has four working conditions:

[0043] (1) During the day with sunlight, the dish concentrator module 1 charges the heat storage module 2, and simultaneously generates steam / electricity through the steam generation and superheating module 3. The seventh valve 13, the eighth valve 14, the first valve 911, the second valve 921, the fourth valve 953, and the sixth valve 45 are opened, while the third valve 931 and the fifth valve 954 are closed. The gas medium in the first gas circuit 10 conducts the heat in multiple dish concentrators 12 to the high-pressure side of the second heat exchanger 11. The second heat exchanger 11 conducts the heat on the high-pressure side to the low-pressure side. The gas medium on the low-pressure side flows out from the hot end of the second heat exchanger 11, and after passing through the eighth valve 14, it is divided into two paths. One path enters the heat storage module 2 through the first gas flow path 91, and the other path enters the steam generation and superheating module 3 through the second gas flow path 92. Then, the gas medium returns to the cold end of the second heat exchanger 11 through the first branch of the fifth gas flow path 951 and the fourth gas flow path 94. The water in the water tank 4 can be transported through the first liquid flow path 41 to the steam generation and superheating module 3 for heat exchange to form high-temperature steam;

[0044] (2) During the day with sunlight, the dish concentrator module 1 only charges the heat storage module 2 and does not generate steam / electricity through the steam generation and superheating module 3. The seventh valve 13, the eighth valve 14, the first valve 911, and the fourth valve 953 are opened, while the second valve 921, the third valve 931, the fifth valve 954, and the sixth valve 45 are closed. The gas medium in the first gas circuit 10 conducts the heat in multiple dish concentrators 12 to the high-pressure side of the second heat exchanger 11. The second heat exchanger 11 conducts the heat on the high-pressure side to the low-pressure side. The gas medium on the low-pressure side flows out from the hot end of the second heat exchanger 11, and after passing through the eighth valve 14, it enters the heat storage module 2 through the first gas flow path 91. Then, the gas medium returns to the cold end of the second heat exchanger 11 through the first branch of the fifth gas flow path 951 and the fourth gas flow path 94;

[0045] (3) During the day with sunlight, the dish concentrator module 1 does not charge the heat storage module 2 and only generates steam / electricity through the steam generation and superheating module 3. The seventh valve 13, the eighth valve 14, the second valve 921, and the sixth valve 45 are opened, while the first valve 911, the third valve 931, the fourth valve 953, and the fifth valve 954 are closed. The gas medium in the first gas circuit 10 conducts the heat in multiple dish concentrators 12 to the high-pressure side of the second heat exchanger 11. The second heat exchanger 11 conducts the heat on the high-pressure side to the low-pressure side. The gas medium on the low-pressure side flows out from the hot end of the second heat exchanger 11, and after passing through the eighth valve 14, it enters the steam generation and superheating module 3 through the second gas flow path 92. Then, the gas medium returns to the cold end of the second heat exchanger 11 through the fourth gas flow path 94. The water in the water tank 4 can be transported through the first liquid flow path 41 to the steam generation and superheating module 3 for heat exchange to form high-temperature steam;

[0046] (4) When there is no light at night, the dish concentrator module 1 does not work, and the heat storage module 2 releases heat to the steam generation and superheating module 3. The third valve 931, the fifth valve 954, and the sixth valve 45 are opened, while the first valve 911, the second valve 921, the fourth valve 953, the seventh valve 13, and the eighth valve 14 are closed. The gas medium supplies the heat in the heat storage module 2 to the steam generation and superheating module 3 through the third gas flow path 93. After that, the gas medium converges to the heat storage module 2 through the fourth gas flow path 94 and the second branch of the fifth gas flow path 952. The water in the water tank 4 can be transported to the steam generation and superheating module 3 through the first liquid flow path 41 for heat exchange to form high-temperature steam.

[0047] In a specific embodiment of the present disclosure, the thermal power of the dish concentrator module 1 can be 140 kw, the heat storage power of the heat storage module 2 can be 90 kw, the heat storage duration during the day can be 6 hours, and the maximum heat storage capacity is 540 kWh. When there is light during the day, the thermal power of the steam generation and superheating module 3 can be 50 kw, among which the thermal power of the superheater 31 is 12.87 kw, and the thermal power of the evaporator 32 is 37.13 kw. During the day, the thermal power of the heat storage module 2 can be 90 kw, and the steam production parameters are 600 °C and 4 Mpa, with a production rate of 50 kg / h for 6 hours continuously. When there is no light at night, the heat release of the heat storage module 2 can be 40 kw, the thermal power of the superheater 31 can be 10.3 kw, and the thermal power of the evaporator 32 can be 29.7 kw. During the night, the steam production parameters are 600 °C and 4 Mpa, with a production rate of 40 kg / h for about 10 hours continuously.

[0048] According to the second aspect of the specific embodiment of the present disclosure, a power generation system is provided. Referring to Figure 1 as shown, the power generation system includes the dish solar thermal device in the above technical solution, as well as a steam turbine 5 and a generator 100. The steam turbine 5 can be fluidly connected to the steam generation and superheating module 3 through the second liquid flow path 51 to receive the high-temperature steam, and the generator 100 can be connected to the steam turbine 5 for power generation.

[0049] Through the above technical solution, the power generation system provided by the present disclosure has the same technical effects as the dish solar thermal device in the above technical solution. To avoid unnecessary repetition, it will not be elaborated here.

[0050] The preferred embodiments of the present disclosure have been described in detail above with reference to the accompanying drawings. However, the present disclosure is not limited to the specific details in the above embodiments. Within the scope of the technical concept of the present disclosure, various simple modifications can be made to the technical solutions of the present disclosure, and these simple modifications all fall within the protection scope of the present disclosure.

[0051] In addition, it should be noted that, among the various specific technical features described in the above specific embodiments, without conflict, they can be combined in any suitable manner. To avoid unnecessary repetition, the present disclosure will not separately describe various possible combination manners.

[0052] In addition, any combination can be made among various different embodiments of the present disclosure, as long as it does not violate the idea of the present disclosure, and it should also be regarded as the content disclosed by the present disclosure.

Claims

1. A dish-type solar thermal device, characterized in that, Comprising: A dish concentrator module, A heat storage module, arranged downstream of the dish concentrator module along the flow direction of the gas medium, A first gas flow path, communicably connected between the hot end of the dish concentrator module and the heat storage module in a switchable manner, so that the gas medium exchanges the thermal energy of the dish concentrator module into the heat storage medium of the heat storage module, A steam generation and superheating module, arranged downstream of the dish concentrator module along the flow direction of the gas medium, A second gas flow path, in parallel with the first gas flow path, and communicably connected between the hot end of the dish concentrator module and the steam generation and superheating module in a switchable manner, so that the gas medium exchanges the thermal energy of the dish concentrator module into the steam generation and superheating module, A third gas flow path, communicably connected between the first gas flow path and the second gas flow path in a switchable manner, so that the gas medium exchanges the thermal energy in the heat storage module into the steam generation and superheating module, A fourth gas flow path, connected between the steam generation and superheating module and the cold end of the dish concentrator module to convey the gas medium back to the dish concentrator module, A fifth gas flow path, connected between the heat storage module and the fourth gas flow path, and A water tank, communicably and fluidly connected to the steam generation and superheating module through a first liquid flow path in a switchable manner to convey the water in the water tank to the steam generation and superheating module for heat exchange to form high-temperature steam.

2. The dish-type solar thermal device according to claim 1, wherein A first heat exchanger is arranged on the fourth gas flow path, and the water tank is also fluidly connected to the first heat exchanger through a first liquid circuit so that the water in the water tank exchanges heat with the first heat exchanger.

3. The dish-type solar thermal device according to claim 2, characterized in that A fan is also arranged on the fourth gas flow path, and the fan is arranged downstream of the first heat exchanger along the flow direction of the gas medium.

4. The dish-type solar thermal device according to claim 3, characterized in that The fifth gas flow path includes: A first branch of the fifth gas flow path, communicably connected between the heat storage module and the upstream of the first heat exchanger in a switchable manner, and A second branch of the fifth gas flow path, communicably connected between the heat storage module and the downstream of the fan in a switchable manner.

5. The dish-type solar thermal device according to claim 3, characterized in that, A filter is also arranged on the fourth gas flow path, and the filter is arranged between the first heat exchanger and the fan.

6. The dish-type solar thermal device according to claim 1, characterized in that, The dish concentrator module includes a second heat exchanger and a plurality of dish concentrators. After being connected in series and / or in parallel, the plurality of dish concentrators are fluidly connected to the second heat exchanger through a first gas circuit, and each dish concentrator is respectively fluidly connected to the second heat exchanger in a switchable manner, The gas medium in the first gas flow path, the second gas flow path and the fourth gas flow path can exchange heat with the second heat exchanger.

7. The dish-type solar thermal device according to claim 1, wherein, The heat storage module includes a plurality of solar thermal energy storage devices containing the heat storage medium, and the plurality of solar thermal energy storage devices are connected in series and / or in parallel.

8. The dish-type solar thermal device according to claim 1, characterized in that, The steam generation and superheating module includes a superheater and an evaporator connected in series or in parallel, and the first liquid flow path sequentially passes through the evaporator and the superheater along the water flow direction.

9. The dish-type solar thermal device according to claim 1, characterized in that The gas medium is an inert gas, and the heat storage medium is a solid material or a phase change material.

10. A power generation system, characterized in that, Comprising the dish-type solar thermal device according to any one of claims 1 to 9, as well as a steam turbine and a generator, wherein the steam turbine is in fluid communication with the steam generation and superheating module through a second liquid flow path to receive the high-temperature steam, and the generator is connected to the steam turbine.

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