Molten salt heat absorber tube panel supporting structure

Abstract

The utility model discloses a fused salt heat absorber tube panel supporting structure which is arranged between bent pipes and a collecting box and comprises a plurality of lifting lugs which are vertically arranged, and each lifting lug is fixedly arranged at the end, away from the collecting box, of the corresponding bent pipe. The hanger plate is fixedly arranged on the header along the length direction of the header; the lifting rods are vertically arranged and correspond to the lifting lugs one to one, and the two ends of each lifting rod are vertically and movably connected with the corresponding lifting lug and the lifting plate respectively; when no temperature difference exists between the pipes of the pipe panel, the lifting lugs and the lifting rods play a role in bearing and bear the load of the pipe panel, and when the temperature difference exists between the pipes, the lifting lugs and the lifting rods connected with the high-temperature pipe move up and down and do not bear the load, and the lifting lugs and the lifting rods connected with the low-temperature pipe bear the load. According to the tube panel supporting structure, hanging can be formed between the bent tube and the collecting box, loads can be selectively borne according to the temperature difference between the tubes, the problem that expansion of the high-temperature tubes is not limited is solved, and it is guaranteed that primary stress meets the requirement after the tube panel bears the loads.

Description

Technical Field

[0001] This utility model relates to the field of molten salt receiver tube screen structures. More specifically, this utility model relates to a molten salt receiver tube screen support structure. Background Technology

[0002] Solar thermal power generation is an important direction for the utilization of new energy sources. The main forms include three types of systems: trough, tower, and dish (panel) systems. The biggest advantage of solar thermal power generation is its stable power output, which can be used for base station power generation and peak shaving; in addition, its mature and reliable energy storage (thermal storage) configuration can generate electricity continuously at night.

[0003] In tower-type concentrated solar power (CSP) plants, molten salt receivers are key components that concentrate high-density solar energy into high-temperature heat. The performance of the molten salt receiver directly determines the outlet temperature of the heat-absorbing medium, which in turn affects the subsequent heat-to-work conversion efficiency. Therefore, the long-term stable operation of the molten salt receiver is crucial for the long-term operation of the power generation system.

[0004] Due to varying light intensities or cloud cover, molten salt receiver tubes experience significant temperature differences and expansion differences, increasing the risk of tube rupture and leakage. To address this expansion issue, larger bends are typically used to enhance tube flexibility, but this significantly reduces tube rigidity, leading to insufficient primary stress. Therefore, resolving this trade-off is crucial in the design of molten salt receiver tube panels.

[0005] In the prior art, such as the utility model patent with application number 201720412876.6, a "Heat Absorber Tube Screen Fixing Device" is disclosed, which consists of heat absorber tubes, adapters, sleeves, mounting shafts, limiting components, support components, connecting shafts, legs, and a steel frame supporting the tube screen. During installation, all heat absorber tubes can be welded to the adapters first, then fitted onto the mounting shafts and fixed to the limiting components with bolts. Because the support component fixed to the limiting component is movably connected to the steel frame, the entire tube screen can be hung on the steel frame during installation, making installation simple and convenient, and allowing for a certain dimensional deviation adjustment margin. This patent addresses the problem of insufficient primary stress on the tubes by adding a steel frame to hang the entire tube screen on it, thus requiring an additional steel frame. Utility Model Content

[0006] The purpose of this invention is to provide a support structure for the tube screen of a molten salt absorber, so as to at least solve the above-mentioned problems.

[0007] To achieve the objectives and other advantages of this utility model, a molten salt absorber tube panel support structure is provided, which is located between a bend and a header. It includes: multiple vertically arranged lifting lugs, each fixed to the end of the corresponding bend furthest from the header; a hanging plate fixed to the header along its length; and multiple vertically arranged hanging rods corresponding to the lifting lugs, with each rod's ends movably connected to the corresponding lifting lug and the hanging plate. When there is no temperature difference between the tubes in the tube panel, the lifting lugs and hanging rods all bear the load. When there is a temperature difference between the tubes, the lifting lugs and hanging rods connected to the high-temperature tubes move vertically and do not bear the load, while the lifting lugs and hanging rods connected to the low-temperature tubes bear the load.

[0008] Preferably, in the molten salt absorber tube screen support structure, the lifting lug is provided with a first waist hole, and the hanging plate is provided with a second waist hole corresponding to the first waist hole. Both the first waist hole and the second waist hole are vertically arranged, wherein the two ends of the hanging rod are respectively movably connected to the first waist hole and the second waist hole.

[0009] Preferably, in the molten salt absorber tube screen support structure, the two ends of the hanger are respectively provided with U-shaped clamps, and the two sides of the open end of the U-shaped clamp are connected by a pin, which is inserted into the first waist hole or the second waist hole.

[0010] Preferably, in the molten salt absorber tube screen support structure, the two ends of the hanger are provided with first threads, and the closed end of the U-shaped clamp is provided with a first threaded hole that mates with the first threads.

[0011] Preferably, in the molten salt absorber tube screen support structure, the rod portion of the pin is provided with a second thread, and the two sides of the open end of the U-shaped clamp are provided with second threaded holes that mate with the second thread.

[0012] Preferably, in the molten salt absorber tube screen support structure, the vertical plane where the lifting lug is located is perpendicular to the hanging plate.

[0013] This utility model has at least the following beneficial effects:

[0014] The molten salt absorber tube panel support structure of this utility model includes a lifting lug connected to the end of the bend away from the header, a hanging plate connected to the header, and a hanging rod located between the lifting lug and the hanging plate and connected to both vertically. The lifting lug, hanging rod, and hanging plate are used to suspend the tubes between the bend and the header. When there is no temperature difference between the tubes in the tube panel, the hanging rod bears the load. When there is a temperature difference between the tubes, the high-temperature tube expands due to heat, causing the lifting lug and hanging rod connected to the high-temperature tube to shift vertically, rendering the suspension ineffective and no longer bearing the load. The low-temperature tube expands less than the high-temperature tube, so the suspension remains effective and bears the weight of the entire tube panel. Therefore, the tube panel support structure of this utility model solves the problem of unrestricted thermal expansion of the high-temperature tube and ensures that the primary stress of the tubes meets the requirements after the tube panel bears the load, without the need for an additional steel frame.

[0015] Other advantages, objectives and features of this invention will be partly apparent from the following description, and partly understood by those skilled in the art through study and practice of this invention. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the connection structure between the molten salt absorber tube screen support structure and the upper header in one embodiment of this utility model;

[0017] Figure 2 This is a schematic diagram of the connection structure between the molten salt absorber tube screen support structure and the lower header according to one embodiment of this utility model;

[0018] Figure 3 yes Figure 3 A schematic diagram of the side view structure;

[0019] Figure 4 This is a schematic diagram of the lifting lug structure according to an embodiment of the present invention;

[0020] Figure 5 This is a schematic diagram of the connection structure of the bent pipe, lifting lug, and lifting rod according to an embodiment of this utility model. Detailed Implementation

[0021] The present invention will now be described in further detail with reference to the accompanying drawings, so that those skilled in the art can implement it based on the description.

[0022] It should be noted that, unless otherwise specified, the experimental methods described in the following embodiments are all conventional methods, and the reagents and materials described are all commercially available unless otherwise specified. In the description of this utility model, the terms "lateral", "longitudinal", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0023] like Figures 1-5 As shown, this utility model provides a molten salt absorber tube panel support structure, which is located between a bend 1 and a header 2. It includes: multiple lifting lugs 3, vertically arranged, each lug 3 fixed to the end of the corresponding bend 1 furthest from the header 2; a hanging plate 4, fixed to the header 2 along its length; and multiple hanging rods 5, vertically arranged and corresponding one-to-one with the multiple lifting lugs 3. The two ends of each hanging rod 5 are respectively connected vertically to the corresponding lifting lug 3 and the hanging plate 4. When there is no temperature difference between the tubes in the tube panel, the multiple lifting lugs 3 and hanging rods 5 all bear the load of the tube panel. When there is a temperature difference between the tubes, the lifting lugs 3 and hanging rods 4 connected to the high-temperature tubes move vertically and do not bear the load, while the lifting lugs 3 and hanging rods 4 connected to the low-temperature tubes bear the load.

[0024] In this embodiment, the molten salt receiver tube panel support structure is located between the bend 1 and the header 2. One end of the bend 1 is connected to the header 2, and the other end is connected to the straight pipe. Two sets of tube panel support structures are symmetrically arranged in one molten salt receiver tube panel, and the two sets of tube panel support structures are symmetrically arranged between the upper header and the lower header. Each set of tube panel support structures may include multiple tube panel support structures. Each tube panel support structure includes multiple lifting lugs 3, lifting plates 4, and multiple lifting rods 5. The multiple lifting lugs 3 are welded or bolted to the end of the corresponding bend 1 away from the header 2, that is, the end connected to the straight pipe. The lifting lugs 3 can be made of carbon steel or high-strength alloy steel, and are preferably rectangular in shape. They are welded to the bend 1 to ensure vertical installation and provide stable support for subsequent connection with the lifting rods 5. The lifting plates 4 are welded to the surface of the header 2 opposite to the lifting lugs 3 along the length direction of the header 2. The hanging plate 4 is elongated and preferably made of carbon steel or high-strength alloy steel to provide sufficient strength to bear the force transmitted from the hanging rod 5. Multiple hanging rods 5 are preferably made of high-strength alloy steel, with their lengths customized according to installation requirements. Each hanging rod 5 has its two ends connected vertically to the corresponding lifting lug 3 and hanging plate 4. The vertical connection structure includes, but is not limited to: 1. Connection via sliders and guide rails. Specifically, a slider can be fixed at each end of the hanging rod 5, and guide rails that slide and engage with the sliders can be provided on the lifting lug 3 and hanging plate 4; 2. Connection via a telescopic structure. Specifically, a telescopic column can be fixed at each end of the hanging rod 5. The telescopic column is composed of at least two sections of tubular or rod-like components joined together, and the free end of the telescopic column is fixedly connected to the lifting lug 3 or hanging plate 4.

[0025] During the initial operation phase of the system, the molten salt temperature inside each tube of the solar thermal power generation system is similar, with virtually no temperature difference between the tubes. At this time, all the lifting lugs 3 and rods 5 evenly bear the load of the solar thermal power generation system, ensuring that the system is stably suspended between the upper and lower headers. As the solar thermal power generation system continues to operate, due to factors such as uneven sunlight focusing and local differences in molten salt flow, temperature differences gradually appear between the tubes within the system. For example, the molten salt temperature inside several tubes near the focusing center rises rapidly, becoming high-temperature tubes. These high-temperature tubes expand due to heat, causing them to bend and deform. The lifting lugs 3 and rods 5 connected to these tubes shift vertically under the deformation of the high-temperature tubes, causing the suspension to fail and temporarily stop bearing the load of the system. The low-temperature tubes expand less than the high-temperature tubes, so the suspension remains effective and they bear the weight of the entire system, reducing the primary stress at the bends. In other words, the system support structure of this invention solves both the problem of unrestricted thermal expansion of the high-temperature tubes and ensures that the primary stress of the tubes meets the requirements after the system bears a load, without the need for additional steel frames.

[0026] In another embodiment, the lifting lug 3 is provided with a first waist hole 6, and the lifting plate 4 is provided with a second waist hole corresponding to the first waist hole 6. Both the first waist hole 6 and the second waist hole are vertically arranged, wherein the two ends of the lifting rod 5 are respectively movably connected to the first waist hole 6 and the second waist hole.

[0027] In this embodiment, the first and second waist holes are preferably used to connect the hanger 5 vertically to both ends. The first and second waist holes provide a certain amount of space for the vertical movement of the hanger 5. When there is a temperature difference between the pipes, the greater expansion of the high-temperature pipe than the low-temperature pipe is absorbed by the displacement of the hanger 5 in the waist holes, thereby reducing the secondary stress on the pipes. The dimensions of the first and second waist holes are optimized based on the thermal expansion and contraction of the tube panel during operation and the possible vibration displacement, ensuring that the hanger 5 can move flexibly within them without detaching from the connection.

[0028] In another embodiment, the two ends of the boom 5 are respectively provided with U-shaped clamps 7, and the two sides of the open end of the U-shaped clamp 7 are connected by a pin 8, which is inserted into the first waist hole 6 or the second waist hole.

[0029] In this embodiment, the two ends of the rod 5 are preferably connected to the first waist hole 6 and the second waist hole through U-shaped clamps 7 and pins 8. This connection method can ensure stable load bearing under normal working conditions, and also allow the lugs 3 and rod 5 connected to the high-temperature pipe to move up and down when there is a temperature difference between the pipes.

[0030] In another embodiment, the two ends of the boom 5 are provided with first threads, and the closed end of the U-shaped chuck 7 is provided with a first threaded hole that mates with the first threads.

[0031] In this embodiment, the boom 5 and the U-shaped chuck 7 are preferably connected by a first thread and a first threaded hole, so as to facilitate timely replacement when cracks occur in the boom 5 or the U-shaped chuck 7, and to facilitate maintenance.

[0032] In another embodiment, the rod portion of the pin 8 is provided with a second thread, and the two sides of the open end of the U-shaped chuck 7 are provided with second threaded holes that mate with the second thread.

[0033] In this embodiment, the pin 8 and the U-shaped chuck 7 are preferably connected through a second thread and a second threaded hole. Firstly, this eliminates the need for a nut during installation, reducing the number of parts. Secondly, it facilitates timely replacement of the pin 8 or the U-shaped chuck 7 if cracks occur, making maintenance easier.

[0034] In another embodiment, the vertical plane where the lifting lug 3 is located is perpendicular to the hanging plate 4.

[0035] In this embodiment, the lifting lugs 4 and the lifting plates 4 are arranged vertically. This serves two purposes: first, it makes better use of the space between the pipes in the tube panel and avoids mutual interference between the components during use; second, it optimizes the force transmission path, improves the mechanical performance of the support structure, and effectively reduces the risk of stress concentration.

[0036] The number of devices and processing scale described herein are for the purpose of simplifying the description of this utility model. Applications, modifications, and variations of the molten salt absorber tube panel support structure of this utility model will be readily apparent to those skilled in the art.

[0037] Although the embodiments of this utility model have been disclosed above, they are not limited to the applications listed in the specification and embodiments. They can be applied to various fields suitable for this utility model. For those skilled in the art, other modifications can be easily made. Therefore, without departing from the general concept defined by the claims and their equivalents, this utility model is not limited to the specific details and the illustrations shown and described herein.

Claims

1. A molten salt absorber tube screen support structure, characterized in that, It is located between the bend and the header, and includes: Multiple lifting lugs are vertically arranged, and each lifting lug is fixed to the end of the corresponding bend pipe away from the header; A hanging plate, which is fixed to the header along the length of the header; Multiple vertically arranged booms are provided, each corresponding to a specific lifting lug. The two ends of each boom are movably connected to the corresponding lifting lug and the suspended platform. When there is no temperature difference between the tubes in the tube panel, all the multiple lugs and rods serve as load-bearing elements, bearing the load of the tube panel. When there is a temperature difference between the tubes, the lugs and rods connected to the high-temperature tubes move up and down and do not bear the load, while the lugs and rods connected to the low-temperature tubes bear the load.

2. The molten salt absorber tube screen support structure as described in claim 1, characterized in that, The lifting lug is provided with a first waist hole, and the lifting plate is provided with a second waist hole corresponding to the first waist hole. Both the first waist hole and the second waist hole are vertically arranged. The two ends of the lifting rod are respectively connected to the first waist hole and the second waist hole for vertical movement.

3. The molten salt absorber tube screen support structure as described in claim 2, characterized in that, The boom is provided with U-shaped clamps at both ends. The two sides of the open end of the U-shaped clamp are connected by a pin, which is inserted into the first waist hole or the second waist hole.

4. The molten salt absorber tube screen support structure as described in claim 3, characterized in that, The two ends of the boom are provided with first threads, and the closed end of the U-shaped clamp is provided with a first threaded hole that mates with the first threads.

5. The molten salt absorber tube screen support structure as described in claim 3, characterized in that, The pin shaft has a second thread on its shaft portion, and the U-shaped chuck has second threaded holes on both sides of its open end that mate with the second thread.

6. The molten salt absorber tube screen support structure as described in claim 3, characterized in that, The vertical plane containing the lifting lug is perpendicular to the hanging plate.

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