Heat absorbing tower external hanging type molten salt pipeline system and molten salt pipeline hanging method

Abstract

The present invention provides a molten salt pipeline system and a molten salt pipeline suspension method outside a heat absorption tower, comprising a molten salt pipeline, a tower top suspension support structure, and a tower body limit support structure. The tower top suspension support structure and the tower body limit support structure are partially cantilevered out of the tower, and a suspension support steel beam is provided on the cantilevered part of the tower top suspension support structure, and a limit support steel beam is provided on the cantilevered part of the tower body limit support structure; the upper part of the molten salt pipeline is connected to the pipeline suspension point connection member through a pipeline connector and then suspended on the suspension support steel beam, and the lower part of the molten salt pipeline is connected to the pipeline limit point connection member through a pipeline connector and then placed above the limit support steel beam. The suspended pipeline is mainly subjected to tension, and can be freely extended and retracted in deformation, releasing the unbalanced internal force generated by the temperature difference, and the wall thickness is significantly thinner than the bending type inside the tower. The force form of the steel platform component of the tower external suspension or limit support can be changed from bending, shearing and torsion to tension or compression, the cross section of the component is subjected to uniform force, and the amount of steel used is greatly reduced.

Description

Technical Field

[0001] The present invention belongs to the technical field of tower solar thermal power generation, and in particular relates to a molten salt pipeline system suspended outside a heat absorption tower and a molten salt pipeline suspension method. Background Art

[0002] In the tower molten salt solar thermal power generation system, the heat absorption tower is its iconic tall structure, which is generally more than 200 meters high. The heat absorber is located at the top of the heat absorption tower as one of the core equipment. The liquid molten salt at about 290°C is pumped from the cold tank on the ground by a cold molten salt pump, and is transported to the heat absorber through the serpentine cold molten salt pipeline 3 arranged in the heat absorption tower. It is heated to 565°C in the heat absorber by solar energy, and then enters the hot molten salt tank for storage through the serpentine hot molten salt pipeline in the tower. In the process of molten salt transportation, it is necessary to use a serpentine molten salt pipeline that is more than 200 meters high and can withstand high pressure and thermal expansion deformation.

[0003] The conventionally designed molten salt pipelines currently have the following main problems:

[0004] 1) The reaction force of the fixed point of the molten salt pipeline is very large under multiple working conditions (self-weight, hot operation, empty pipe preheating, installation, etc.), especially under the action of large temperature difference load (about 300℃), which causes the pipeline to bend inward and the torque is difficult to control within the allowable range. In order to eliminate these phenomena and meet the force balance of the pipeline and equipment interface and the safety of the pipeline system, a large number of "U-shaped plane" and "U-shaped vertical" arrangements are carried out in the heat absorption tower, which increases the number of pipeline elbows, and the number of matching fixed supports, limit supports, and sliding supports also increases accordingly.

[0005] 2) There are a large number of steel platforms for maintenance and support of elbow valves, etc., and they bear a large pipeline support reaction force.

[0006] 3) The pipe diameter and wall thickness are large, the construction is complex, the construction period is long, the quality requirements are high, and the cost is extremely high.

[0007] 4) Since the hot and cold salt pipes are coiled in the tower, the space inside the tower must be large enough, which increases the cost of the heat absorption tower.

[0008] 5) The height of the heat absorption tower of large-scale power stations will become higher and higher, which will make the design and construction of the serpentine molten salt pipeline more and more difficult. For example, the number of support and hanger platforms and corresponding tower wall embedded parts supporting the molten salt pipeline in the tower will increase, the design and installation difficulties will increase due to the increase in pipe diameter, the cost of overcoming temperature stress of the pipeline will increase, and the demand for space in the tower will increase. Summary of the invention

[0009] The purpose of the present invention is to provide a molten salt pipeline system suspended outside a heat absorption tower, so as to overcome the technical problems existing in the prior art.

[0010] Another object of the present invention is to provide a method for hanging a molten salt pipeline in a heat absorption tower, so that the stress form of the external suspension or limited support steel platform components of the tower is changed from bending, shear and torsion to tension or compression, the component cross section is evenly stressed, the material strength can be reasonably utilized, and the steel consumption of the entire support system will be greatly reduced compared with traditional methods.

[0011] To this end, the technical solution provided by the present invention is as follows:

[0012] The molten salt pipeline system suspended outside the tower of the heat absorption tower comprises a molten salt pipeline, a tower top suspension support structure, a tower body limit support structure, a pipeline suspension point connection component and a pipeline limit point connection component. The tower body limit support structure is provided with a plurality of structures. The tower top suspension support structure and the tower body limit support structure are both partially cantilevered out of the tower. A suspension support steel beam is provided on the cantilevered part of the tower top suspension support structure, and a limit support steel beam is provided on the cantilevered part of the tower body limit support structure.

[0013] The molten salt pipeline is provided with a pipeline connector, and the upper part of the molten salt pipeline is connected to the pipeline suspension point connection member through the pipeline connector and then suspended on the suspension support steel beam, and the lower part of the molten salt pipeline is connected to the pipeline limit point connection member through the pipeline connector and then placed above the limit support steel beam.

[0014] The tower top suspension support structure is a transverse and longitudinal steel truss, which includes an upper chord steel beam, a lower chord steel beam and an intermediate web member. Both ends of the upper chord steel beam and the lower chord steel beam are rigidly connected to the concrete bracket on the inner side of the tower wall, and the upper chord steel beam and the lower chord steel beam are connected by the intermediate web member.

[0015] The cantilevered part of the tower top suspension support structure is formed by the upper chord steel beam extending out of the tower wall to form a suspension point platform steel beam. The lower flange of the suspension point platform steel beam is connected with a 45° inclined support. The other end of the inclined support is connected to the embedded part on the outer side of the tower wall. Two first beams are arranged between the two suspension point platform steel beams. The two first beams are connected by a second beam. The suspension support steel beam is arranged between the first beam and the suspension point platform steel beam, and between the first beam and the second beam.

[0016] The molten salt pipeline comprises a cold salt pipe and a hot salt pipe, the molten salt pipeline comprises a pipe wall, a thermal insulation layer and a pipe connector, the thermal insulation layer is arranged outside the pipe wall, the pipe connector is arranged outside the pipe wall and extends out of the thermal insulation layer, and the extension length is Di .

[0017] The pipeline suspension point connection component includes a suspension point support steel beam, an oblique tie rod and a stopper steel plate, wherein the stopper steel plate is arranged on the tower top suspension support structure, one end of the oblique tie rod is rigidly connected to the suspension point support steel beam, the other end of the oblique tie rod is rigidly connected to the pipeline connection piece, the other end of the suspension point support steel beam is rigidly connected to the pipeline connection piece, the suspension point support steel beam is in contact with the suspension support steel beam, and a heat insulation plate is arranged between the suspension point support steel beam and the stopper steel plate;

[0018] There are four pipeline suspension point connection components, which are evenly distributed along the circumference of the molten salt pipeline and form an angle of 45° with the horizontal axis.

[0019] The pipeline limit point connection component includes a limit point support steel beam and a stop steel plate, the limit point support steel beam is rigidly connected to the pipeline connector, the stop steel plate is arranged on the tower body limit support structure, and a heat insulation plate is arranged between the limit point support steel beam and the stop steel plate;

[0020] There are four connecting members at the pipeline limit point, which are evenly distributed along the circumference of the molten salt pipeline and form an angle of 45° with the horizontal axis. hi .

[0021] The tower body limiting support structure is arranged at intervals of 20-30m along the tower body, and the molten salt pipeline is provided with an insulation load-bearing ring every 10-15m. The insulation load-bearing ring is an unequal angle steel, the short side of which is welded to the pipe wall and the long side is cantilevered.

[0022] The molten salt pipeline is provided with large pressure difference buffer valves or variable diameter buffer valves in sections, and a buffer bin is provided at the bottom of the heat absorption tower, and the bottom elevation of the buffer bin is higher than that of the molten salt storage tank.

[0023] The cold salt pipe is made of Q355R steel, the hot salt pipe is made of TP347H steel, and the insulation layer is a rock wool-type flexible or semi-rigid insulation layer.

[0024] The thickness of the stop steel plate is 10-14 mm, and the suspension point support steel beam or the limit point support steel beam is a square steel tube.

[0025] The molten salt pipeline suspension method of the heat absorption tower adopts a molten salt pipeline system suspended outside the heat absorption tower. A tower top suspension support structure is arranged at the top of the heat absorption tower. A tower body limit support structure is arranged every 20-30m along the tower body below the tower top. The tower body limit support structure limits the horizontal displacement of the molten salt pipeline and enables the molten salt pipeline to deform freely vertically. The tower top suspension support structure is partially cantilevered out of the tower to bear the vertical weight of all molten salt pipelines, thereby reducing the stress on the molten salt pipeline and realizing the suspension of the molten salt pipeline outside the heat absorption tower.

[0026] The beneficial effects of the present invention are:

[0027] 1. The suspended pipe is only subjected to tension and can be freely expanded and contracted in deformation, releasing the unbalanced internal force caused by the temperature difference. The wall thickness can be significantly thinner than the bending type in the tower.

[0028] 2. This pipeline arrangement can change the stress form of the tower external suspension or limited support steel platform components from bending, shear and torsion to tension or compression. The component cross section is evenly stressed, the material strength can be reasonably utilized, and the steel consumption of the entire support system will be greatly reduced compared with traditional methods.

[0029] 3. As the molten salt pipeline is suspended outside the tower, there is sufficient space inside the tower. Under the premise of meeting the structural stress, the amount of tower concrete can be optimized, the upper and lower opening sizes of the tower can be reduced, and the total cost of the project can be reduced.

[0030] 4. The suspended pipes can be hoisted in separate parts, which can greatly reduce the weight of a single hoisting compared to construction inside the tower. The construction and hoisting machinery is simple and easy to install.

[0031] 5. The suspended molten salt pipeline system of the present invention has certain economy and practicability in the field of tower-type solar thermal power station engineering at home and abroad, and has broad application prospects.

[0032] In order to make the above contents of the present invention more clearly understood, preferred embodiments are given below and described in detail in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 is a schematic elevation diagram of an embodiment of the present invention;

[0034] Figure 2 It is a schematic diagram of the tower top suspension support structure;

[0035] Figure 3 It is a schematic diagram of the tower body limit support structure;

[0036] Figure 4 It is a schematic diagram of the connection components between the suspension point support steel beam and the pipeline suspension point;

[0037] Figure 5 yes Figure 4 1-1 sectional view;

[0038] Figure 6 It is a schematic diagram of the connection components between the limit point support steel beam and the pipeline limit point;

[0039] Figure 7 yes Figure 6 1-1 sectional view;

[0040] Figure 8 It is a schematic diagram of pipe connectors.

[0041] In the figure:

[0042] Description of reference numerals:

[0043] 1. Horizontal and vertical steel trusses; 2. Suspension point platform steel beam; 3. Molten salt pipeline; 4. Insulation layer; 5. Limit point platform steel beam; 6. Suspension point support steel beam; 7. Oblique pull rod; 8. Stop steel plate; 9. Limit point support steel beam; 10. Insulation board; 11. Pipeline connector; 12. Tower top suspension support structure; 13. Tower body limit support structure; 14. Suspension support steel beam; 15. Limit support steel beam; 16. Oblique support; 17. First beam; 18. Second beam; 19. Buffer bin; 20. Molten salt storage tank; 21. Heat absorber; 22. Cold salt pipe; 23. Hot salt pipe; 24. Pipeline suspension point connection component; 25. Pipeline limit point connection component; 26. Groove. DETAILED DESCRIPTION

[0044] The following describes the implementation of the present invention through specific embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0045] It should be noted that, in the present invention, the up, down, left and right in the figure are deemed to be the up, down, left and right of the molten salt pipeline system suspended outside the heat absorption tower described in this specification.

[0046] The exemplary embodiments of the present invention are now described with reference to the accompanying drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. These embodiments are provided to disclose the present invention in detail and completely and to fully convey the scope of the present invention to those skilled in the art. The terms used in the exemplary embodiments shown in the accompanying drawings are not intended to limit the present invention. In the accompanying drawings, the same units / elements are marked with the same reference numerals.

[0047] Unless otherwise specified, the terms (including technical terms) used herein have the commonly understood meanings to those skilled in the art. In addition, it is understood that the terms defined in commonly used dictionaries should be understood to have the same meanings as those in the context of the relevant fields, and should not be understood as idealized or overly formal meanings.

[0048] Embodiment 1:

[0049] This embodiment provides a molten salt pipeline system suspended outside a heat absorption tower, such as Figure 1As shown, it includes a molten salt pipeline 3, a tower top suspension support structure 12, a tower body limit support structure 13, a pipeline suspension point connection member 24 and a pipeline limit point connection member 25, the tower body limit support structure 13 is provided with a plurality of tower body limit support structures, the tower top suspension support structure 12 and the tower body limit support structure 13 are both partially cantilevered out of the tower, a suspension support steel beam 14 is provided on the cantilevered part of the tower top suspension support structure 12, and a limit support steel beam 15 is provided on the cantilevered part of the tower body limit support structure 13;

[0050] The molten salt pipeline 3 is provided with a pipeline connector 11, and the upper part of the molten salt pipeline 3 is connected to the pipeline suspension point connection member 24 through the pipeline connector 11 and then suspended on the suspension support steel beam 14, and the lower part of the molten salt pipeline 3 is connected to the pipeline limit point connection member 25 through the pipeline connector 11 and then placed above the limit support steel beam 15.

[0051] The present invention arranges a suspension support steel beam 14 on the cantilevered part of the tower top suspension support structure 12 to bear the weight of all molten salt pipelines 3 (including the insulation layer 4 and the limiting connector) in the vertical direction, and the pipelines only bear the tension and the small bending and torsional internal force generated by the wind load and the earthquake. The limiting support steel beam 15 is arranged on the cantilevered part of all the tower body limiting support structures 13 below the tower top to limit the horizontal displacement of the molten salt pipeline 3 without limiting its vertical expansion and deformation.

[0052] Embodiment 2:

[0053] Based on Example 1, this example provides a molten salt pipeline system suspended outside a heat absorption tower, such as Figure 2 As shown, the tower top suspension support structure 12 is a transverse and longitudinal steel truss 1, and the transverse and longitudinal steel truss 1 includes an upper chord steel beam, a lower chord steel beam and an intermediate web member, both ends of the upper chord steel beam and the lower chord steel beam are rigidly connected to the concrete bracket on the inner side of the tower wall, and the upper chord steel beam and the lower chord steel beam are connected by the intermediate web member;

[0054] The cantilevered part of the tower top suspension support structure 12 is formed by the upper chord steel beam extending out of the tower wall to form a suspension point platform steel beam 2. The lower flange of the suspension point platform steel beam 2 is connected with a 45° inclined support 16. The other end of the inclined support 16 is connected to the embedded part on the outer side of the tower wall. Two first beams 17 are arranged between the two suspension point platform steel beams 2. The two first beams 17 are connected by a second beam 18. The suspension support steel beam 14 is arranged between the first beam 17 and the suspension point platform steel beam 2, and between the first beam 17 and the second beam 18.

[0055] like Figure 2 As shown, the tower top suspension support structure 12 is a support structure system composed of the horizontal and vertical steel trusses 1 on the tower top. On the one hand, this structure system supports the upper heat absorber 21 equipment, and on the other hand, it partially cantilevers out of the tower to support and suspend the molten salt pipeline 3.

[0056] The details of the cantilevered part are as follows: the upper chord beam of the middle horizontal steel truss is cantilevered out of the tower wall, and a 45° inclined support 16 is provided below, one end of which is connected to the lower flange of the upper chord beam, and the other end is connected to the embedded part on the outer side of the tower wall to form a stable triangular support. Among them, the upper chord steel beam of the cantilevered truss should be continuous and cannot be disconnected. The specific method is to open a groove 26 at the tower wall, and the upper chord steel beam passes through and supports the tower wall with the lower flange to ensure the integrity of the spatial structure.

[0057] The tower top suspension support structure 12 provides a suspension support for the suspended molten salt pipeline 3, and forms a work platform for hoisting and maintenance of the molten salt pipeline 3 outside the tower. The truss rods are all made of conventional steel sections, and the rods are connected by welding or high-strength bolts. The main force form of the rods is axial tension or compression, and the cross-section force is uniform, which fully exerts the strength of the material. In order to ensure that the space truss is an over-static structure, the upper and lower chord ends of the transverse and longitudinal steel trusses 1 are rigidly connected to the concrete brackets on the inner side of the tower wall, so that the trusses can adjust the internal force distribution through deformation, and transfer part of the force to the rods that can continue to bear the load, avoiding acute damage to the supporting structure system. This kind of transverse and longitudinal steel trusses 1 are supported at multiple points of the concrete tower, and the tower wall is evenly stressed without special reinforcement.

[0058] Embodiment 3:

[0059] Based on Example 1, this example provides a molten salt pipeline system suspended outside a heat absorption tower, such as Figure 3 As shown, the cantilevered part of the tower body limit support structure 13 is in the same form as the cantilevered part of the tower top suspension support structure 12, and the upper chord steel beam is extended outward from the tower wall to form a limit point platform steel beam 5, with a 45° oblique support 16 provided underneath.

[0060] A limit point platform steel beam 5 is set every 20-30m along the tower body. In order to facilitate the workers' inspection and maintenance, a steel platform inside the tower should be set at this elevation for use by elevators and stairwells.

[0061] The main feature of the tower body limit support structure 13 is that it does not support the gravity and internal pressure of the molten salt pipeline 3, but only limits the horizontal swing caused by wind load or other factors. The cross section of its rods is much smaller than that of the tower top support structure. According to the calculation results of the thermal expansion of the pipeline and the local wind vibration, each section of the pipeline with limit needs to reserve a certain deformation value in the vertical direction, that is, the bottom of the pipeline limit connector and the top of the platform steel beam reserve a certain deformation value. hi ( hi is the deformation value corresponding to the different heights of each section).

[0062] Embodiment 4:

[0063] On the basis of Example 1, this embodiment provides a molten salt pipeline system suspended outside the heat absorption tower, wherein the molten salt pipeline 3 includes a cold salt pipe 22 and a hot salt pipe 23, the molten salt pipeline 3 includes a pipe wall, an insulation layer 4 and a pipe connector 11, the insulation layer 4 is arranged outside the pipe wall, and the pipe connector 11 is arranged outside the pipe wall and extends out of the insulation layer 4, and the extension length is Di .

[0064] Molten salt pipeline 3 Figure 8 As shown, the cold salt pipe 22 is made of Q355R steel, and the hot salt pipe 23 is made of TP347H steel; the insulation material is a rock wool-like flexible or semi-rigid insulation layer that can be deformed in coordination with the pipeline.

[0065] The pipe connector 11 is made of the same material as the pipe and must be rigidly connected to the pipe wall. To ensure reliable force transmission, an I-shaped welding section is adopted, and the periphery is welded with a groove. The extension size at different sections is Di The pipe connection piece 11 is prefabricated in the factory before leaving the factory.

[0066] Embodiment 5:

[0067] On the basis of Example 1, this embodiment provides a molten salt pipeline system suspended outside the tower of a heat absorption tower, wherein the pipeline suspension point connection member 24 includes a suspension point support steel beam 6, an oblique tie rod 7 and a stop steel plate 8, wherein the stop steel plate 8 is arranged on the tower top suspension support structure 12, one end of the oblique tie rod 7 is rigidly connected to the suspension point support steel beam 6, the other end of the oblique tie rod 7 is rigidly connected to the pipeline connector 11, the other end of the suspension point support steel beam 6 is rigidly connected to the pipeline connector 11, the suspension point support steel beam 6 is in contact with the suspension support steel beam 14, and an insulation plate 10 is arranged between the suspension point support steel beam 6 and the stop steel plate 8;

[0068] There are four pipeline suspension point connection members 24, which are evenly distributed along the circumference of the molten salt pipeline 3 and form an angle of 45° with the horizontal axis.

[0069] like Figure 4 and Figure 5 As shown, the suspension point connection component is that the oblique tie rod 7 and the suspension point support steel beam 6 are rigidly connected to the pipeline connector 11. After becoming a whole with the molten salt pipeline 3, it is directly placed on the platform's suspension support steel beam 14, which is closer to an ideal hinge support and can effectively release the bending moment, thereby reducing the reaction force value.

[0070] In order to prevent the hinge support from failing and the pipeline from rotating, a stopper steel plate 8 with a thickness of 10-14mm is set on the suspension support steel beam 14; the oblique tie rod 7 is made of 150x150 square steel pipe, and the suspension point support steel beam 6 is made of 200x200 square steel pipe, all of which are made of Q355. The advantage of the square steel pipe section is that all four sides can fully contact with the stopper steel plate 8, and the force is evenly distributed.

[0071] A heat insulation board 10 (hard mica board) is provided at the contact point between the suspension point support steel beam 6 and the stopper steel plate 8, and its heat resistance temperature is not less than 500°C, the thermal conductivity is about 0.07-0.1W / mk, and the bending strength is greater than 200N / mm 2 , which plays a role in heat insulation for the stop plate and the platform supporting steel beam; the outer surface of the hard mica board is sprayed with polytetrafluoroethylene to reduce friction and allow the pipeline to deform freely vertically.

[0072] like Figure 2 As shown, the cold salt pipe 22 and the hot salt pipe 23 are both suspended outside the heat absorption tower. Figure 2 As shown, each molten salt pipeline 3 is provided with four suspension support steel beams 14, and each molten salt pipeline 3 is suspended on the suspension point platform steel beam 2 through four suspension points, and the four suspension points are at an angle of 45° with the horizontal axis. In other words, eight suspension support steel beams 14 are provided at the suspension point platform steel beam 2, and the cold salt pipe 22 and the hot salt pipe 23 are suspended through the eight suspension points.

[0073] Embodiment 6:

[0074] On the basis of Example 1, this embodiment provides a heat absorption tower external suspension type molten salt pipeline system, the pipeline limit point connection member 25 includes a limit point support steel beam 9 and a stop steel plate 8, the limit point support steel beam 9 is rigidly connected to the pipeline connector 11, the stop steel plate 8 is arranged on the tower body limit support structure 13, and a heat insulation plate 10 is arranged between the limit point support steel beam 9 and the stop steel plate 8;

[0075] There are four pipeline limit point connection members 25, which are evenly distributed along the circumference of the molten salt pipeline 3 and form an angle of 45° with the horizontal axis. hi .

[0076] like Figure 6 and Figure 7 As shown, the limit point connection component includes a limit point support steel beam 9 and a stop steel plate 8. The limit point support steel beam 9 is made of 150x150 square steel pipe, material Q355, and is rigidly connected to the pipeline connector 11.

[0077] A heat insulation board 10 (hard mica board) is provided at the contact point between the limit point support steel beam 9 and the stop steel plate 8, and its heat resistance temperature is not less than 500°C, the thermal conductivity is about 0.07-0.1W / mk, and the bending strength is greater than 200N / mm 2 , which plays a role in heat insulation for the stop plate and the platform supporting steel beam; the outer surface of the hard mica board is sprayed with polytetrafluoroethylene to reduce friction and allow the pipeline to deform freely vertically.

[0078] like Figure 3As shown, the cold salt pipe 22 and the hot salt pipe 23 are both limited by the tower body limit support structure 13. Like the suspension points, there are eight limit points, all of which form an angle of 45° with the horizontal axis.

[0079] Embodiment 7:

[0080] On the basis of Example 1, this embodiment provides a heat absorption tower external suspension type molten salt pipeline system, the tower body limit support structure 13 is arranged at intervals of 20-30m along the tower body, and the molten salt pipeline 3 is provided with an insulation load-bearing ring every 10-15m, and the insulation load-bearing ring is an unequal angle steel, the short side of which is welded to the pipe wall, and the long side is cantilevered. The load-bearing ring is used to strengthen the integrity of the pipeline and the insulation layer 4.

[0081] The molten salt pipeline 3 is provided with large pressure difference buffer valves or variable diameter buffer valves in sections, and a buffer bin 19 is provided at the bottom of the heat absorption tower. The bottom elevation of the buffer bin 19 is higher than that of the molten salt storage tank 20.

[0082] The large pressure difference buffer valve or the variable diameter buffer valve and the buffer bin 19 can slow down the impact force of the hot molten salt from top to bottom. The bottom elevation of the buffer bin 19 should be higher than the height of the molten salt storage tank 20 to ensure the fluidity of the hot molten salt.

[0083] Embodiment 8:

[0084] The present embodiment provides a method for suspending a molten salt pipeline in a heat absorption tower, which adopts a molten salt pipeline system suspended outside the tower of the heat absorption tower. A tower top suspension support structure 12 is arranged at the top of the heat absorption tower, and a tower body limiting support structure 13 is arranged every 20-30m along the tower body below the tower top. The tower body limiting support structure 13 limits the horizontal displacement of the molten salt pipeline 3 and allows the molten salt pipeline 3 to deform vertically freely. The tower top suspension support structure 12 is partially cantilevered out of the tower to bear the vertical weight of all molten salt pipelines 3, thereby reducing the force on the molten salt pipeline 3 and realizing the suspension of the molten salt pipeline 3 outside the tower of the heat absorption tower.

[0085] In summary, the pipeline arrangement of the present invention can change the stress form of the tower external suspension or limited support steel platform components from bending, shearing and torsion to tension or compression, the component cross section is evenly stressed, the material strength can be reasonably utilized, and the steel consumption of the entire support system will be greatly reduced compared with the traditional method. The suspension pipeline is mainly subjected to tension, and can be freely extended and retracted in deformation, releasing the unbalanced internal force caused by the temperature difference, and the wall thickness can be significantly thinner than the bending type inside the tower.

[0086] Since the molten salt pipeline 3 is suspended outside the tower, there is sufficient space inside the tower. Under the premise of meeting the structural stress, the amount of tower concrete can be optimized, the upper and lower openings of the tower can be reduced, and the total cost of the project can be reduced. The suspended pipeline can be hoisted in separate parts, which can greatly reduce the single hoisting weight compared to the construction inside the tower. The construction hoisting machinery is simple and the installation is convenient.

[0087] Those skilled in the art will appreciate that the above-mentioned embodiments are specific examples for implementing the present invention, and in actual applications, various changes may be made thereto in form and detail without departing from the spirit and scope of the present invention.

Claims

1. The molten salt pipeline system suspended outside the heat absorption tower is characterized by: The tower body limit support structure (13) comprises a molten salt pipeline (3), a tower top suspension support structure (12), a tower body limit support structure (13), a pipeline suspension point connection component (24), and a pipeline limit point connection component (25), wherein the tower body limit support structure (13) is provided with a plurality of structures, the tower top suspension support structure (12) and the tower body limit support structure (13) are both partially cantilevered out of the tower, a suspension support steel beam (14) is provided on the cantilevered portion of the tower top suspension support structure (12), and a limit support steel beam (15) is provided on the cantilevered portion of the tower body limit support structure (13); The molten salt pipeline (3) is provided with a pipeline connector (11), the upper portion of the molten salt pipeline (3) is connected to the pipeline suspension point connection member (24) through the pipeline connector (11) and then suspended on the suspension support steel beam (14), and the lower portion of the molten salt pipeline (3) is connected to the pipeline limit point connection member (25) through the pipeline connector (11) and then placed above the limit support steel beam (15); The tower top suspension support structure (12) is a transverse and longitudinal steel truss (1), the transverse and longitudinal steel truss (1) comprising an upper chord steel beam, a lower chord steel beam and an intermediate web member, both ends of the upper chord steel beam and the lower chord steel beam are rigidly connected to the concrete bracket on the inner side of the tower wall, and the upper chord steel beam and the lower chord steel beam are connected via the intermediate web member; The cantilevered portion of the tower top suspension support structure (12) is formed by the upper chord steel beam extending outward from the tower wall to form a suspension point platform steel beam (2); the lower flange of the suspension point platform steel beam (2) is connected to a 45° inclined support (16); the other end of the inclined support (16) is connected to an embedded part on the outer side of the tower wall; two first beams (17) are provided between the two suspension point platform steel beams (2); the two first beams (17) are connected by a second beam (18); the suspension support steel beam (14) is provided between the first beam (17) and the suspension point platform steel beam (2) and between the first beam (17) and the second beam (18); the molten salt pipeline (3) comprises a cold salt pipeline (22) and a hot salt pipeline (23); the molten salt pipeline (3) comprises a pipe wall, a thermal insulation layer (4) and a pipe connector (11); the thermal insulation layer (4) is provided outside the pipe wall; the pipe connector (11) is provided outside the pipe wall and extends out of the thermal insulation layer (4); the extension length is Di.

2. The heat absorption tower external hanging molten salt pipeline system according to claim 1 is characterized in that: The pipeline suspension point connection component (24) comprises a suspension point support steel beam (6), an oblique tie rod (7) and a stopper steel plate (8), wherein the stopper steel plate (8) is arranged on the tower top suspension support structure (12), one end of the oblique tie rod (7) is rigidly connected to the suspension point support steel beam (6), the other end of the oblique tie rod (7) is rigidly connected to the pipeline connection piece (11), the other end of the suspension point support steel beam (6) is rigidly connected to the pipeline connection piece (11), the suspension point support steel beam (6) is in contact with the suspension support steel beam (14), and a heat insulation plate (10) is arranged between the suspension point support steel beam (6) and the stopper steel plate (8); There are four pipeline suspension point connection components (24), which are evenly distributed along the circumference of the molten salt pipeline (3) and form an angle of 45° with the horizontal axis.

3. The heat absorption tower external hanging molten salt pipeline system according to claim 1 is characterized in that: The pipeline limit point connection component (25) comprises a limit point support steel beam (9) and a stop steel plate (8), the limit point support steel beam (9) is rigidly connected to the pipeline connection piece (11), the stop steel plate (8) is arranged on the tower body limit support structure (13), and a heat insulation plate (10) is arranged between the limit point support steel beam (9) and the stop steel plate (8); There are four pipeline limit point connection components (25), which are evenly distributed along the circumference of the molten salt pipeline (3) and form an angle of 45° with the horizontal axis. A space hi is reserved between the limit point support steel beam (9) and the limit support steel beam (15).

4. The heat absorption tower external hanging molten salt pipeline system according to claim 1 is characterized in that: The tower body limiting support structure (13) is arranged at intervals of 20-30 m along the tower body, and the molten salt pipeline (3) is provided with a heat-insulating load-bearing ring every 10-15 m. The heat-insulating load-bearing ring is an unequal-leg angle steel, the short side of which is welded to the pipe wall, and the long side is cantilevered.

5. The heat absorption tower external hanging molten salt pipeline system according to claim 1 is characterized in that: The molten salt pipeline (3) is provided with large pressure difference buffer valves or variable diameter buffer valves in sections, and a buffer bin (19) is provided at the bottom of the heat absorption tower, wherein the bottom elevation of the buffer bin (19) is higher than that of the molten salt storage tank (20).

6. The heat absorption tower external hanging molten salt pipeline system according to claim 1 is characterized in that: The cold salt pipe (22) is made of Q355R steel, the hot salt pipe (23) is made of TP347H steel, and the insulation layer (4) is a rock wool-type flexible or semi-rigid insulation layer.

7. The heat absorption tower external hanging molten salt pipeline system according to claim 2 is characterized in that: The stop steel plate (8) has a thickness of 10-14 mm, and the suspension point support steel beam (6) is a square steel tube.

8. The heat absorption tower external hanging molten salt pipeline system according to claim 3 is characterized by: The limit point support steel beam (9) is a square steel tube.

9. A method for suspending a molten salt pipeline in a heat absorption tower, using the heat absorption tower externally suspended molten salt pipeline system according to claim 1, characterized in that: A tower top suspension support structure (12) is arranged at the top of the heat absorption tower, and a tower body limiting support structure (13) is arranged every 20-30 m along the tower body below the tower top. The tower body limiting support structure (13) limits the horizontal displacement of the molten salt pipeline (3) and allows the molten salt pipeline (3) to deform freely in the vertical direction. The tower top suspension support structure (12) is partially cantilevered out of the tower to bear the vertical weight of all the molten salt pipelines (3), thereby reducing the stress on the molten salt pipelines (3) and realizing the suspension of the molten salt pipelines (3) outside the tower barrel of the heat absorption tower.

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