A tower-type photothermal power zone Π-shaped plane layout structure and salt drainage method thereof

Abstract

The present invention belongs to the field of tower-type solar thermal power zone layout structure design, and provides a tower-type solar thermal power zone Π-shaped plane layout structure and its salt drainage method. The layout structure includes a cold molten salt tank, a heat absorption tower, a hot molten salt tank, a steam generation system structure and a Π-shaped pipe rack; the cold molten salt tank, the heat absorption tower, the hot molten salt tank and the steam generation system structure are respectively arranged at the four corners of the quadrilateral corresponding to the power zone; the Π-shaped pipe rack is composed of a molten salt pump bracket, a heat exchange bracket and a heat collection bracket; the molten salt pump bracket is used to support the molten salt pump and the molten salt pipeline between the cold molten salt tank and the hot molten salt tank; the heat exchange bracket is used to support the molten salt pipeline between the hot molten salt tank and the steam generation system structure; the heat collection bracket is used to support the molten salt pipeline between the cold molten salt tank and the heat absorption tower.

Description

Technical Field

[0001] The present invention belongs to the field of tower-type photothermal power zone structure design, and in particular relates to a Π-shaped plane layout structure of a tower-type photothermal power zone and a salt drainage method thereof. Background Art

[0002] The statements in this section merely provide background information related to the present invention and do not necessarily constitute prior art.

[0003] The current layout of the main structures in the power area of ​​a solar thermal power station places the steam generation system building far from the turbine room, with the steam generation system located between the hot and cold molten salt tanks. This can easily lead to uneven settling of the molten salt tanks. Furthermore, this results in longer molten salt pipelines, which in turn lead to longer steam-water pipelines, resulting in longer startup times for the steam turbine units and lower operational efficiency. The latest version of the design specification, DL / T5604-2021, "Specifications for General Layout and Transportation Design of Solar Thermal Power Plants," stipulates that the minimum distance between molten salt storage tanks and Class C, D, and E secondary and tertiary buildings should not be less than 20 meters. The traditional arrangement of the steam generation system between the hot and cold molten salt tanks results in wasted molten salt pipelines, which in turn increases investment. Summary of the Invention

[0004] In order to solve the technical problems existing in the above-mentioned background technology, the present invention provides a tower-type solar thermal power zone Π-shaped plane layout structure, which optimizes the layout of the main buildings in the power zone in combination with the energy flow diagram of the process flow, thereby shortening the length of the main pipeline, reducing the investment in pipeline supports, reducing the start-up time of the steam turbine unit, and improving the operating economy of the solar thermal energy station, and proposes a salt drainage method based on the Π-shaped plane layout structure.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A tower-type solar thermal power zone with a Π-shaped plane layout structure, comprising:

[0007] Cold molten salt tank, heat absorption tower, hot molten salt tank, steam generation system structures and Π-type pipe rack;

[0008] The cold molten salt tank, heat absorption tower, hot molten salt tank and steam generation system structures are respectively arranged at the four corners of the quadrilateral corresponding to the power area;

[0009] The Π-shaped pipe rack is composed of a molten salt pump bracket, a heat exchange bracket and a heat collection bracket;

[0010] The molten salt pump bracket is used to support the molten salt pump and the molten salt pipeline located between the cold molten salt tank and the hot molten salt tank; wherein the molten salt pipeline located between the cold molten salt tank and the hot molten salt tank includes but is not limited to the molten salt pipeline flowing into or out of the cold molten salt tank and / or the hot molten salt tank.

[0011] The heat exchange bracket is used to support the molten salt pipeline between the hot molten salt tank and the steam generation system structure;

[0012] The heat collecting bracket is used to support the molten salt pipeline between the cold molten salt tank and the heat absorbing tower.

[0013] The molten salt pump support refers to a civil engineering support provided for supporting the molten salt pump and the molten salt pipeline located between the cold molten salt tank and the hot molten salt tank. From the overall plan view, the molten salt pump support is arranged in a horizontal direction, forming the horizontal line of the Π-shaped pipe rack;

[0014] The heat exchange bracket refers to a civil engineering bracket provided to support the molten salt pipeline between the hot molten salt tank and the steam generation system structure. From the overall layout diagram, the heat exchange bracket and the molten salt pump bracket are arranged in a vertical direction, forming the first vertical line of the Π-shaped pipe rack;

[0015] The heat collection bracket refers to a civil engineering bracket set up to support the molten salt pipeline located between the cold molten salt tank and the heat absorption tower. From the overall plan layout, the heat collection bracket and the molten salt pump bracket are arranged in a vertical direction, forming the second vertical line of the Π-shaped pipe rack.

[0016] As an embodiment, it includes multiple parts, wherein the first part of the heat collecting bracket is arranged in a vertical direction to the molten salt pump bracket.

[0017] As an embodiment, the molten salt pump bracket includes a cold molten salt pump bracket and a hot molten salt pump bracket;

[0018] The cold molten salt pump bracket is arranged close to the cold molten salt tank, and the hot molten salt pump bracket is arranged close to the hot molten salt tank.

[0019] As an embodiment, the cold molten salt pump bracket is used to support the cold molten salt pump, and the cold molten salt pump is connected to the cold molten salt tank to extract the cold molten salt in the cold molten salt tank;

[0020] The molten salt pump bracket is used to support the molten salt pump, which is connected to the molten salt tank and is used to extract the molten salt from the molten salt tank.

[0021] As an implementation method, the molten salt pipeline arranged on the Π-shaped bracket mainly includes molten salt pipelines of two process systems, namely, the molten salt pipelines of the heat collection system and the heat exchange system.

[0022] The medium flow direction of the molten salt pipeline of the heat collection system is as follows: the cold molten salt in the cold molten salt tank is sucked out by the cold molten salt pump and is connected to the heat absorber at the top of the heat absorption tower through the cold molten salt pipelines arranged on the molten salt pump bracket and the heat collection bracket in sequence. The cold molten salt absorbs heat in the heat absorber and becomes hot molten salt. The hot molten salt is connected to the hot molten salt tank and / or the cold molten salt tank through the hot molten salt pipelines arranged on the heat collection bracket and / or the molten salt pump bracket;

[0023] The medium flow direction of the molten salt pipeline of the heat exchange system is as follows: the hot molten salt in the hot molten salt tank is sucked out by the hot molten salt pump and is connected to the steam generation system structure in sequence through the hot molten salt pipelines arranged on the molten salt pump bracket and the heat exchange bracket. The hot molten salt is converted into cold molten salt after heat exchange with water in the steam generation system structure. The cold molten salt is connected to the cold molten salt tank through the cold molten salt pipeline arranged on the heat exchange bracket and / or the molten salt pump bracket.

[0024] As an embodiment, the cold molten salt pump bracket and the hot molten salt pump bracket are arranged in parallel;

[0025] As an implementation method, the civil structures of the cold molten salt pump support and the hot molten salt pump support are not connected to each other; the molten salt pipeline is arranged across the cold molten salt pump support and the hot molten salt pump support.

[0026] As another embodiment, the civil structures of the cold molten salt pump support and the hot molten salt pump support are connected to each other; the molten salt pipeline is arranged across the cold molten salt pump support and the hot molten salt pump support.

[0027] As an embodiment, the molten salt pump support is composed of multiple rows of reinforced concrete pillars and / or steel pillars, wherein the cold molten salt pump support adopts a fixed span on the side close to the hot molten salt tank; the hot molten salt pump support adopts a fixed span on the side close to the cold molten salt tank.

[0028] Among them, the meaning of fixed span is: in multiple rows of continuously arranged reinforced concrete pillars and / or steel pillars, every four adjacent pillars constitute a load-bearing unit, and some load-bearing units directly support the load of the molten salt pump, while at least two rows of reinforced concrete pillars and / or steel pillars connected to these load-bearing units directly supporting the molten salt pump do not support the load of the molten salt pump. Then the at least two rows of continuously arranged reinforced concrete pillars and / or steel pillars are called fixed spans.

[0029] The advantage of the above technical solution is that, through the fixed span design, on the one hand, it provides civil engineering support for the molten salt pipeline between the cold molten salt tank and the hot molten salt tank; on the other hand, it also increases the rigidity of the molten salt pump bracket and reduces the vibration of the molten salt pump, thereby improving the safety and reliability of the molten salt pump operation.

[0030] As an embodiment, the connecting pipe between the cold molten salt tank and the heat absorption tower passes through the molten salt pump bracket and the heat collection bracket in sequence.

[0031] As another embodiment, the connecting pipe between the heat absorption tower and the molten salt tank passes through the heat collection bracket and the molten salt pump bracket in sequence.

[0032] As an embodiment, the connecting pipe between the molten salt tank and the steam generation system structure passes through the molten salt pump bracket and the heat exchange bracket in sequence.

[0033] As an embodiment, the connecting pipe between the steam generation system structure and the cold molten salt tank passes through the heat exchange bracket and the molten salt pump bracket in sequence.

[0034] As an embodiment, the molten salt pipeline on the heat collecting bracket is arranged to form an expansion bend only in the horizontal direction.

[0035] In one embodiment, the slope of the molten salt pipeline on the heat collector bracket is from the heat absorption tower to the molten salt tank. That is, the molten salt pipeline closer to the heat absorption tower has a higher elevation than the molten salt pipeline closer to the molten salt tank. This ensures that the lowest point of the molten salt pipeline on the heat collector bracket only exists on the molten salt pipeline near the molten salt pump bracket.

[0036] As an embodiment, the height of the top layer of the heat collecting support is not lower than the height of the bottom layer of the molten salt pump support.

[0037] The advantage of the above technical solution is that the elevation of the molten salt pipeline on the heat collecting bracket is higher than the elevation of the molten salt pipeline on the molten salt pump bracket connected thereto, so that the pipeline connecting the heat absorption tower and the cold molten salt tank can rely on gravity to drain salt or discharge salt to the cold molten salt tank, and the pipeline connecting the heat absorption tower and the hot molten salt tank can rely on gravity to drain salt or discharge salt to the cold molten salt tank or the hot molten salt tank.

[0038] As an embodiment, the top layer height of the heat exchange support is lower than the bottom layer height of the molten salt pump support.

[0039] The advantage of the above technical solution is that it enables the molten salt pipeline between the molten salt tank and the steam generation system structure to form an expansion bend in the vertical direction to absorb the thermal displacement of the pipeline.

[0040] As an embodiment, the molten salt pipeline on the heat exchange bracket is used to drain salt or discharge salt to a salt draining tank located in the steam generation system structure by gravity; the elevation of the salt draining tank is lower than the elevation of all molten salt pipelines in the steam generation system structure.

[0041] As an embodiment, the molten salt pipeline on the heat exchange bracket is used to drain salt or discharge salt to a salt draining tank located outside the steam generating system structure by gravity, and the salt draining tank is arranged close to the steam generating system structure; the elevation of the salt draining tank is lower than the elevation of all molten salt pipelines in the steam generating system structure.

[0042] As an embodiment, only the molten salt pipeline is arranged on the Π-shaped support, and the steam-water pipelines are arranged between the steam generation system structure and the steam power system structure;

[0043] As an implementation method, the steam generation system structure and the steam power system structure are arranged closely together.

[0044] As an embodiment, the Π-shaped plane layout structure of the tower-type solar thermal power zone also includes a steam working system structure, which is arranged closely to the steam generating system structure. The steam generated in the steam generating system structure is used to enter the steam working system structure and drive the steam turbine generator set to generate electricity.

[0045] As another embodiment, the Π-shaped plane layout structure of the tower-type solar thermal power zone also includes a steam utilization system building, which is arranged closely to the steam generation system building. The steam generated in the steam generation system building is used to enter the steam utilization system building and use steam for heating.

[0046] The traditional steam generation system is located between the hot molten salt tank and the cold molten salt tank, and the salt drainage tank is also located between the hot molten salt tank and the cold molten salt tank. The molten salt pipelines of both the heat collection system and the heat exchange system drain salt to the salt drainage tank. The cold molten salt tank, the heat absorption tower, the hot molten salt tank and the steam generation system structure of the present invention are respectively arranged on the four corners of the quadrilateral corresponding to the power zone. The steam generation system structure is not located between the hot molten salt tank and the cold molten salt tank. In order to solve the salt drainage problem based on the Π-type plane layout structure, the present invention provides a salt drainage method based on the Π-type plane layout structure of the above-mentioned tower-type photothermal power zone.

[0047] The present invention also provides a method for draining salt based on a Π-shaped planar layout structure of a tower-type photothermal power zone, comprising:

[0048] The molten salt in the molten salt pipeline of the solar collector system is drained by gravity through the molten salt pipeline, or discharged to the cold molten salt tank / hot molten salt tank; the molten salt in the molten salt pipeline of the heat exchange system is first drained or discharged to the salt drain tank, and then pumped into the cold molten salt tank or hot molten salt tank through the salt drain pump.

[0049] Compared with the prior art, the present invention has the following beneficial effects:

[0050] (1) The present invention optimizes the layout of the main structures in the power area and shortens the length of the main pipeline by setting up a Π-shaped bracket, reducing pipeline resistance;

[0051] (2) The functional characteristics of the three components of the Π-shaped bracket of the present invention, namely the molten salt pump bracket, the heat collection bracket, and the heat exchange bracket, are clear and obvious, the pipeline layout is simple and smooth, and the length of the pipeline bracket is short, which reduces the investment in civil engineering structure;

[0052] (3) The spacing between the main structures in the power area of ​​the present invention is reasonable, especially the distance between the molten salt tank and the steam generation system structure is large, so that there is no large load around the molten salt tank, and the molten salt tank is not prone to uneven settlement, thereby meeting the latest version of the design specification DL / T5604-2021 "General Plan and Transportation Design Specifications for Solar Thermal Power Plants" regarding "the minimum distance between the molten salt storage tank and Class C, D, and E secondary and tertiary buildings should not be less than 20m".

[0053] (4) In the Π-shaped bracket of the present invention, only molten salt pipelines are arranged on the bracket, and the steam-water pipelines are arranged between the steam generating system structure and the steam working system structure. The steam generating system structure and the steam working system structure are arranged closely together, thereby shortening the length of the steam-water pipeline, shortening the starting time of the steam turbine generator set, and greatly improving the operating economy.

[0054] (5) The present invention achieves salt drainage or discharge nearby by cleverly utilizing the height difference through the highly layered arrangement of the Π-shaped bracket. For example, the molten salt pipeline on the heat absorption tower and the heat collection bracket drains or discharges salt to the cold molten salt tank or the hot molten salt tank, and the molten salt pipeline on the heat exchange bracket drains or discharges salt to the salt drainage tank;

[0055] (6) The buildings and structures of the present invention have a neat appearance, simple functional divisions, high land utilization rate, and are convenient for operation and maintenance, access for personnel, equipment replacement, and fire safety, thereby reducing the land acquisition area and land acquisition and leasing costs.

[0056] (7) The molten salt pump support of the present invention adopts multiple rows of pillars, wherein a fixed span is adopted between the two molten salt tanks, thereby increasing the rigidity of the molten salt pump support, reducing the vibration of the molten salt pump, and thus improving the safety and reliability of the molten salt pump operation.

[0057] Advantages of additional aspects of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0058] The accompanying drawings, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0059] Figure 1 This is a plan view of a Π-shaped planar layout structure of a tower-type solar thermal power zone according to an embodiment of the present invention;

[0060] Figure 2 This is a plan view of another tower-type solar thermal power zone Π-shaped planar layout structure according to an embodiment of the present invention;

[0061] Figure 3 2 is a cross-sectional view of a π-shaped planar layout structure of a tower-type solar thermal power zone according to an embodiment of the present invention;

[0062] Figure 4 This is a schematic diagram showing that the top layer of the heat collecting support in an embodiment of the present invention is higher than the bottom layer of the cold molten salt pump support.

[0063] Among them, 1. cold molten salt tank; 2. heat absorption tower; 3. hot molten salt tank; 4. steam generation system structure; 5-1. hot molten salt pump bracket; 5-2. cold molten salt pump bracket; 6. heat exchange bracket; 7. heat collection bracket; 7-1. top layer of heat collection bracket; 8. fixed span of hot molten salt pump bracket; 9. fixed span of cold molten salt pump bracket; 10. steam power system structure; 11. salt drainage tank; 12. low-load heater; 13. reheater; 14. superheater; 15. steam drum; 16. cold molten salt pump; 17. heat absorber; 18. cold molten salt pipeline of heat collection system; 19. salt drainage pipeline of cold molten salt pipeline of heat collection system; 20-1. bottom layer of molten salt pump bracket; 20-2. top layer of molten salt pump bracket. DETAILED DESCRIPTION

[0064] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0065] It should be noted that the following detailed descriptions are illustrative and intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which the present invention belongs.

[0066] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present invention. As used herein, unless the context clearly indicates otherwise, the singular form is intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0067] according to Figure 1 、 Figure 2 and Figure 3 , a tower-type solar thermal power zone Π-shaped plane layout structure of this embodiment includes:

[0068] Cold molten salt tank 1, heat absorption tower 2, hot molten salt tank 3, steam generation system structure 4 and Π-type pipe rack;

[0069] The cold molten salt tank 1, the heat absorption tower 2, the hot molten salt tank 3 and the steam generation system structure 4 are respectively arranged at the four corners of the quadrilateral corresponding to the power area;

[0070] The Π-shaped pipe rack is composed of a molten salt pump bracket, a heat exchange bracket 6 and a heat collection bracket 7; among them, 7-1 is the top layer of the heat collection bracket.

[0071] The molten salt pump bracket is used to support the molten salt pump and the molten salt pipeline located between the cold molten salt tank and the hot molten salt tank; wherein the molten salt pipeline located between the cold molten salt tank and the hot molten salt tank includes but is not limited to the molten salt pipeline flowing into or out of the cold molten salt tank and / or the hot molten salt tank.

[0072] The heat exchange bracket is used to support the molten salt pipeline between the hot molten salt tank and the steam generation system structure;

[0073] The heat collecting bracket is used to support the molten salt pipeline between the cold molten salt tank and the heat absorbing tower.

[0074] The molten salt pump support refers to a civil engineering support provided for supporting the molten salt pump and the molten salt pipeline between the cold molten salt tank and the hot molten salt tank. From the overall plan view, the molten salt pump support is arranged in a horizontal direction, forming the horizontal line of the Π-shaped pipe rack;

[0075] The heat exchange bracket refers to a civil engineering bracket provided to support the molten salt pipeline between the hot molten salt tank and the steam generation system structure. From the overall layout diagram, the heat exchange bracket and the molten salt pump bracket are arranged in a vertical direction, forming the first vertical line of the Π-shaped pipe rack;

[0076] The heat collection bracket refers to a civil engineering bracket set up to support the molten salt pipeline located between the cold molten salt tank and the heat absorption tower. From the overall plan layout, the heat collection bracket and the molten salt pump bracket are arranged in a vertical direction, forming the second vertical line of the Π-shaped pipe rack.

[0077] exist Figure 1 In the embodiment, the solar collector bracket only includes the part which is arranged perpendicular to the molten salt pump bracket.

[0078] exist Figure 2 In the embodiment, the solar collector bracket includes multiple parts, wherein the first part of the molten salt pump bracket is arranged in a vertical direction, and for the remaining parts, a bracket perpendicular to the first part is provided for the expansion bend of the pipeline.

[0079] This embodiment optimizes the layout of the main structures in the power area. By setting up a Π-shaped bracket, the length of the main pipeline is shortened and the pipeline resistance is reduced. Moreover, the functional characteristics of the three components of the Π-shaped bracket, namely the molten salt pump bracket, the heat collection bracket, and the heat exchange bracket are clear and obvious, and the pipeline layout is simple and smooth.

[0080] In the specific implementation process, the molten salt pump bracket includes a cold molten salt pump bracket 5-2 and a hot molten salt pump bracket 5-1;

[0081] The cold molten salt pump bracket 5 - 2 is arranged close to the cold molten salt tank, and the hot molten salt pump bracket 5 - 1 is arranged close to the hot molten salt tank.

[0082] Specifically, the molten salt pump support is composed of multiple rows of steel pillars or reinforced concrete pillars, wherein the cold molten salt pump support adopts a fixed span on the side close to the hot molten salt tank; the hot molten salt pump support adopts a fixed span on the side close to the cold molten salt tank. Figure 1 and Figure 2 As shown, the fixed span of the cold molten salt pump bracket is 9, and the fixed span of the hot molten salt pump bracket is 8.

[0083] The fixed span means: at least two rows of steel pillars are arranged continuously, or at least two rows of reinforced concrete pillars are arranged continuously, or at least one row of steel pillars and one row of reinforced concrete pillars are arranged continuously.

[0084] The fixed span design increases the rigidity of the molten salt pump bracket and reduces the vibration of the molten salt pump, thereby improving the safety and reliability of the molten salt pump operation.

[0085] The molten salt pump support of this embodiment adopts multiple rows of concrete pillars, wherein a fixed span is adopted between the two molten salt tanks, thereby increasing the rigidity of the molten salt pump support, reducing the vibration of the molten salt pump, and thus improving the safety and reliability of the molten salt pump operation.

[0086] Among them, the cold molten salt pump bracket is used to support the cold molten salt pump, and the cold molten salt pump is connected to the cold molten salt tank for extracting the cold molten salt in the cold molten salt tank; the hot molten salt pump bracket is used to support the hot molten salt pump, and the hot molten salt pump is connected to the hot molten salt tank for extracting the hot molten salt in the hot molten salt tank.

[0087] In some embodiments, the civil structures of the cold molten salt pump support and the hot molten salt pump support are not connected to each other; the molten salt pipeline is arranged to cross the cold molten salt pump support and the hot molten salt pump support.

[0088] In other embodiments, the civil structures of the cold molten salt pump support and the hot molten salt pump support are connected to each other; and the molten salt pipeline is arranged across the cold molten salt pump support and the hot molten salt pump support.

[0089] In some optional embodiments, the connecting pipe between the cold molten salt tank and the heat absorption tower passes through the molten salt pump bracket and the heat collection bracket in sequence.

[0090] In another optional embodiment, the connecting pipe between the heat absorption tower and the molten salt tank passes through the heat collection bracket and the molten salt pump bracket in sequence.

[0091] In some optional embodiments, the connecting pipe between the hot molten salt tank and the steam generation system structure passes through the molten salt pump bracket and the heat exchange bracket in sequence.

[0092] In another optional embodiment, the connecting pipe between the steam generation system structure and the cold molten salt tank passes through the heat exchange bracket and the molten salt pump bracket in sequence.

[0093] During the specific implementation process, the molten salt pipeline on the heat collecting bracket is arranged to form an expansion bend only in the horizontal direction, and no expansion bend is formed in the height direction.

[0094] In practice, the slope of the molten salt pipeline on the heat collector bracket slopes from the heat absorption tower toward the molten salt tank. That is, the molten salt pipeline closer to the heat absorption tower has a higher elevation than the molten salt pipeline closer to the molten salt tank. This ensures that the lowest point of the molten salt pipeline on the heat collector bracket only occurs on the side of the molten salt pipeline near the molten salt pump bracket.

[0095] In some implementations, such as Figure 4 As shown, the height of the top layer 7-1 of the heat collecting bracket is not lower than the height of the bottom layer 20-1 of the cold molten salt pump bracket. This makes the elevation of the molten salt pipeline on the heat collecting bracket 7 higher than the elevation of the molten salt pipeline on the cold molten salt pump bracket 5-2 connected thereto, so that the molten salt pipeline connecting the heat absorbing tower 2 and the cold molten salt tank 1 can rely on gravity to drain salt or discharge salt to the cold molten salt tank, and also allows the molten salt pipeline connecting the heat absorbing tower and the hot molten salt tank to rely on gravity to drain salt or discharge salt to the cold molten salt tank or the hot molten salt tank. Figure 4 In the figure, the top layer of the molten salt pump support is 20-2.

[0096] In some implementations, the top layer of the heat exchange support is lower than the bottom layer of the molten salt pump support, so that the molten salt pipeline between the molten salt tank and the steam generation system structure can form a vertical expansion bend to absorb thermal displacement of the pipeline.

[0097] In the specific implementation process, Figure 3 As shown, the molten salt pipeline on the heat exchange bracket 6 is used to drain salt or discharge salt to the salt draining tank 11 located in the steam generation system structure through gravity.

[0098] This embodiment achieves nearby salt diversion or discharge by cleverly utilizing the height difference through the highly layered arrangement of the Π-shaped bracket. For example, the molten salt pipeline on the heat absorption tower and the heat collection bracket diverts or discharges salt to the cold molten salt tank or the hot molten salt tank, and the molten salt pipeline on the heat exchange bracket diverts or discharges salt to the salt diversion tank 11.

[0099] In some optional embodiments, the molten salt pipeline on the heat exchange bracket is used to drain salt or discharge salt to a salt draining tank 11 located in the steam generation system structure by gravity; the elevation of the salt draining tank 11 is lower than the elevation of all molten salt pipelines in the steam generation system structure.

[0100] In other optional embodiments, the molten salt pipeline on the heat exchange bracket is used to drain or discharge salt to a salt draining tank 11 located outside the steam generating system structure by gravity, and the salt draining tank 11 is arranged close to the steam generating system structure; the elevation of the salt draining tank 11 is lower than the elevation of all molten salt pipelines in the steam generating system structure.

[0101] In some optional embodiments, the tower-type solar thermal power zone Π-shaped plane layout structure also includes a steam working system structure 10, and the steam working system structure 10 is arranged closely to the steam generating system structure 4. The steam generated in the steam generating system structure 4 is used to enter the steam working system structure and drive the steam turbine generator set to generate electricity.

[0102] In some other optional embodiments, the tower-type solar thermal power zone Π-shaped plane layout structure also includes a steam utilization system building, which is arranged closely to the steam generation system building 4. The steam generated in the steam generation system building 4 is used to enter the steam utilization system building and use steam for heating.

[0103] It should be noted that in Figure 1 In the figure, the steam power system structure 10 is only shown located on one side of the steam generation system structure 4, that is, the steam generation system structure 4 is located between the hot salt tank and the steam power system structure 10. The present invention is also applicable to the case where the steam power system structure 10 is located on either side of the steam generation system structure 4. Similarly, the present invention is also applicable to the case where the steam utilization system structure is located on either side of the steam generation system structure 4.

[0104] exist Figure 3 In the tower-type solar thermal power zone, a low-load heater 12, a reheater 13, a superheater 14 and a steam drum 15 are also arranged in the Π-shaped plane layout structure.

[0105] In this embodiment, only molten salt pipelines are arranged on the Π-shaped bracket, and the steam-water pipelines are arranged between the steam generating system structure and the steam power system structure. The steam generating system structure and the steam power system structure are arranged closely together, thereby shortening the length of the steam-water pipeline, shortening the start-up time of the steam turbine generator set, and greatly improving the operating economy.

[0106] The medium flow direction of the molten salt pipeline arranged on the Π-shaped bracket in this embodiment is as follows: the cold molten salt in the cold molten salt tank is sucked out by the cold molten salt pump and is connected to the heat absorber at the top of the heat absorption tower in sequence through the cold molten salt pipelines arranged on the cold molten salt pump bracket and the heat collecting bracket. The cold molten salt absorbs heat in the heat absorber and becomes hot molten salt. The hot molten salt is connected to the hot molten salt tank and / or the cold molten salt tank through the hot molten salt pipeline arranged on the heat collecting bracket and / or the molten salt pump bracket; the hot molten salt in the hot molten salt tank is sucked out by the hot molten salt pump and is connected to the steam generation system structure in sequence through the hot molten salt pipelines arranged on the hot molten salt pump bracket and the heat exchange bracket. The hot molten salt is converted into cold molten salt after heat exchange with water in the steam generation system structure. The cold molten salt is connected to the cold molten salt tank through the cold molten salt pipelines arranged on the heat exchange bracket and / or the molten salt pump bracket.

[0107] The tower-type solar thermal power zone of this embodiment has a Π-shaped planar layout structure with neat appearance, simple functional divisions, high land utilization rate, convenient operation and maintenance, convenient access for personnel, equipment replacement and fire safety, and reduced land acquisition area and land lease costs.

[0108] The salt removal method based on the Π-shaped plane layout structure of the tower-type photothermal power zone as described above includes:

[0109] The molten salt in the molten salt pipeline of the solar collector system is drained by gravity through the molten salt pipeline, or discharged to the cold molten salt tank / hot molten salt tank; the molten salt in the molten salt pipeline of the heat exchange system is first drained or discharged to the salt drain tank, and then pumped into the cold molten salt tank or hot molten salt tank through the salt drain pump.

[0110] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A tower-type solar thermal power zone Π-shaped plane layout structure, characterized in that: include: Cold molten salt tank, heat absorption tower, hot molten salt tank, steam generation system structures and Π-type pipe rack; The cold molten salt tank, heat absorption tower, hot molten salt tank and steam generation system structures are respectively arranged at the four corners of the quadrilateral corresponding to the power area; The Π-shaped pipe rack is composed of a molten salt pump bracket, a heat exchange bracket and a heat collection bracket; The molten salt pump bracket is arranged in a horizontal direction; the heat exchange bracket and the molten salt pump bracket are arranged in a vertical direction; the heat collection bracket and the molten salt pump bracket are arranged in a vertical direction; The molten salt pump bracket is used to support the molten salt pump and the molten salt pipeline located between the cold molten salt tank and the hot molten salt tank; The heat exchange bracket is used to support the molten salt pipeline between the hot molten salt tank and the steam generation system structure; The heat collecting bracket is used to support the molten salt pipeline between the cold molten salt tank and the heat absorbing tower.

2. The tower-type photothermal power zone Π-shaped plane layout structure according to claim 1, characterized in that: The molten salt pump bracket includes a cold molten salt pump bracket and a hot molten salt pump bracket; The cold molten salt pump bracket is arranged close to the cold molten salt tank, and the hot molten salt pump bracket is arranged close to the hot molten salt tank.

3. The tower-type photothermal power zone Π-shaped plane layout structure according to claim 2, characterized in that: The cold molten salt pump bracket is used to support the cold molten salt pump, and the cold molten salt pump is connected to the cold molten salt tank to extract the cold molten salt in the cold molten salt tank; or The molten salt pump bracket is used to support the molten salt pump, which is connected to the molten salt tank and is used to extract the molten salt from the molten salt tank; or The connecting pipe between the cold molten salt tank and the heat absorption tower passes through the molten salt pump bracket and the heat collection bracket in sequence; or The connecting pipe between the heat absorption tower and the molten salt tank passes through the heat collection bracket and the molten salt pump bracket in sequence.

4. The tower-type photothermal power zone Π-shaped plane layout structure according to claim 2, characterized in that: The cold molten salt pump bracket and the hot molten salt pump bracket are arranged in parallel; or The civil structures of the cold molten salt pump support and the hot molten salt pump support are not connected to each other; the molten salt pipeline is arranged across the cold molten salt pump support and the hot molten salt pump support; or The civil structures of the cold molten salt pump support and the hot molten salt pump support are connected to each other; the molten salt pipeline is arranged across the cold molten salt pump support and the hot molten salt pump support.

5. The tower-type photothermal power zone Π-shaped plane layout structure according to claim 2, characterized in that: The molten salt pump support is composed of multiple rows of pillars, wherein the cold molten salt pump support adopts a fixed span on the side close to the hot molten salt tank; the hot molten salt pump support adopts a fixed span on the side close to the cold molten salt tank.

6. The tower-type photothermal power zone Π-shaped plane layout structure according to claim 1 or 2, characterized in that: The lowest point of the molten salt pipeline on the heat collecting bracket only exists on the molten salt pipeline close to the molten salt pump bracket side; or The molten salt pipe on the heat collecting bracket is arranged to form an expansion bend only in the horizontal direction; or The slope direction of the molten salt pipeline on the heat collecting bracket is from the heat absorption tower to the molten salt tank; or The molten salt pipeline on the heat collecting bracket dilutes or discharges salt to the cold molten salt tank or the hot molten salt tank.

7. The tower-type photothermal power zone Π-shaped plane layout structure according to claim 1 or 2, characterized in that: The molten salt pipeline on the heat exchange bracket is used to drain salt or discharge salt to a salt drain tank located in the steam generation system structure by gravity; the elevation of the salt drain tank is lower than the elevation of all molten salt pipelines in the steam generation system structure; or The molten salt pipeline on the heat exchange bracket is used to drain salt or discharge salt to a salt draining tank located outside the steam generation system structure by gravity, and the salt draining tank is arranged close to the steam generation system structure; the elevation of the salt draining tank is lower than the elevation of all molten salt pipelines in the steam generation system structure.

8. The tower-type photothermal power zone Π-shaped plane layout structure according to claim 1, characterized in that: The top layer height of the heat collecting bracket is not lower than the bottom layer height of the molten salt pump bracket; or The top layer height of the heat exchange bracket is lower than the bottom layer height of the molten salt pump bracket; or The molten salt pipeline on the heat exchange bracket is used to drain salt or discharge salt to the salt drain tank by gravity; the molten salt in the salt drain tank is pumped out by the salt drain pump and connected to the cold molten salt tank and / or the hot molten salt tank through the salt recovery pipeline arranged on the heat exchange bracket and / or the molten salt pump bracket.

9. The tower-type photothermal power zone Π-shaped plane layout structure according to claim 1, characterized in that: The Π-shaped pipe rack is only equipped with molten salt pipes, while the steam-water pipes are arranged between the steam generation system structure and the steam power system structure; or The steam generation system structures and steam power system structures are arranged close together; or The tower-type solar thermal power zone Π-shaped plane layout structure also includes a steam power system structure, which is arranged closely with the steam generation system structure. The steam generated in the steam generation system structure is used to enter the steam power system structure and drive the steam turbine generator set to generate electricity; or The tower-type solar thermal power zone Π-shaped plane layout structure also includes a steam utilization system building, which is arranged closely to the steam generation system building. The steam generated in the steam generation system building is used to enter the steam utilization system building and use steam for heating.

10. A method for removing salt based on the Π-shaped planar layout structure of a tower-type photothermal power zone according to any one of claims 1 to 9, characterized in that: include: The molten salt in the molten salt pipeline of the solar collector system is drained by gravity through the molten salt pipeline, or discharged to the cold molten salt tank / hot molten salt tank; the molten salt in the molten salt pipeline of the heat exchange system is first drained or discharged to the salt drain tank, and then pumped into the cold molten salt tank or hot molten salt tank through the salt drain pump.

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