Low-position molten salt storage tank and molten salt pump supporting structure system

Abstract

The utility model belongs to the technical field of heat storage molten salt tanks and vertical rotating pump supporting structures thereof, and discloses a low-position molten salt storage tank and molten salt pump supporting structure system which comprises a pit wall structure, the low-position molten salt storage tank is transversely arranged in the pit wall structure, and a front tank body supporting foundation and a rear tank body supporting foundation are arranged on a bottom plate of the pit wall structure. The low-position fused salt storage tank is arranged above the tank body supporting foundation, a pump supporting platform is arranged on the side face of the top of the pit wall structure, and a pipeline supporting platform is arranged on the top face of the pit wall structure. The platform is strong in integrity, high in economical efficiency and simple in form, materials of platform components are convenient to purchase and construct, the construction cost is reduced, and the high-power power generation index of a photo-thermal power station is met.

Description

Technical Field

[0001] The utility model belongs to the technical field of heat storage molten salt tanks and their supporting vertical rotating pumps, and particularly relates to a low-position molten salt storage tank and a molten salt pump support structure system. Background Technique

[0002] With the vigorous development and application of new energy technologies by the country, especially in the heat storage and heat exchange areas of solar thermal power plants and energy storage power plants, there is an urgent need for an economical and reliable molten salt storage tank and its support structure to cooperate with the molten salt storage tank. The characteristics and difficulties of the commonly used molten salt storage tank and its support structure are as follows:

[0003] First, according to the main function of the molten salt pump: to make the molten salt in the storage tank flow, mix the molten salt, and make the temperature field of the molten salt in the storage tank close to uniform, reducing the temperature difference of the molten salt in the storage tank. For the current vertical cylindrical type, the molten salt pump extends into the storage tank from the semi-circular tank top, which inevitably leads to a longer pump shaft, and larger parameters such as head, motor, and pressure, resulting in a higher overall cost of the pump.

[0004] Second, for the pump support structure of vertical storage tanks at home and abroad, it is generally a straddle-type or cantilever-type molten salt pump support platform. Such a support platform is set on the top of a vertical cylindrical storage tank, and the structural support system is set as a relatively high concrete support wall, with a cantilever steel platform on the upper part. The disadvantages of such a support system are that the structural layout height is relatively high (height 15 - 20m), the platform overhang length is relatively long (projecting 5 - 6m), the shape is complex, the construction difficulty is also relatively large, and the economic index is not high.

[0005] To overcome the above adverse situations, the utility model provides a new type of structural support system in cooperation with and making full use of a low-position horizontal molten salt storage tank. Content of the Utility Model

[0006] The purpose of the utility model is to provide a low-position molten salt storage tank and a molten salt pump support structure system, which has strong integrity, high economy, a simple platform form, convenient procurement and construction of platform component materials, reduces the project cost, and meets the high-power power generation index of solar thermal power plants.

[0007] To achieve the above purpose, the technical solution adopted by the utility model is as follows:

[0008] A low-position molten salt storage tank and a molten salt pump support structure system, including a pit wall structure, the low-position molten salt storage tank is horizontally placed in the pit wall structure, there are two front and rear tank body support bases arranged on the bottom plate of the pit wall structure, the low-position molten salt storage tank is arranged above the tank body support bases, a pump support platform is arranged on the top side of the pit wall structure, and a pipeline support platform is arranged on the top surface of the pit wall structure.

[0009] Preferably, the pit wall structure includes a concrete bottom slab and side walls, presenting a "U-shaped" as a whole. The concrete bottom slab and the side walls are fixedly connected. On both sides of the side walls, pilasters are arranged at certain intervals, and the pilasters are arranged through from top to bottom. Prefabricated steel anchor plates are embedded in the side surface and the top surface of each pilaster respectively. The prefabricated steel anchor plate on the side surface of the top is used to fix the pump support platform, and the prefabricated steel anchor plate on the top surface is used to fix the pipeline support platform.

[0010] Preferably, the pilasters and the side walls are fixedly connected. The thickness of the pilasters protrudes 300 - 400 mm from the side walls. The pilasters and the side walls form a "T-shaped" cross-section as a whole. A prefabricated rectangular steel anchor plate is embedded in the side surface of the top of the pilasters, and a prefabricated square steel anchor plate is embedded in the top surface.

[0011] Preferably, the tank support foundation includes a strip-shaped short wall. Steel anchor plates and bolt holes are respectively arranged on the top surface of the strip-shaped short wall, realizing one-end fixed and one-end sliding connection with the saddle of the low-temperature molten salt storage tank.

[0012] Preferably, the pump support platform adopts the form of composite steel beams + horizontal bracings, the pipeline support platform adopts the form of steel columns + steel beams. The height of the pit wall structure is 6 - 9.0 m. The pump support platform is 2.5 - 3.5 m higher than the top of the low-temperature molten salt storage tank, and the pipeline support platform is 3.5 - 5.0 m higher than the pump support platform.

[0013] Preferably, the main body of the composite steel beam is an H-shaped steel beam. Transverse stiffeners are welded at the middle positions of its upper and lower flanges, and longitudinal stiffeners are welded at certain intervals. The transverse stiffeners, the longitudinal stiffeners and the web of the H-shaped steel beam jointly form the composite steel beam. The composite steel beam is rigidly connected to the prefabricated rectangular steel anchor plate on the side surface of the pilaster.

[0014] Preferably, the horizontal bracings adopt equal-angle steel and are arranged diagonally and crosswise between the two composite steel beams.

[0015] Preferably, the steel columns adopt an I-shaped cross-section. The lower ends of the steel columns are rigidly connected to the prefabricated square steel anchor plates on the top surfaces of the pilasters, and transverse and longitudinal steel beams are connected to the tops of the steel columns.

[0016] The beneficial effects of the present utility model are as follows:

[0017] 1. For the low-temperature molten salt storage tank and the molten salt pump support structure system provided by the present utility model, by making full use of the pilasters and side walls of the pit wall structure, the stiffness and bearing capacity of the overall support structure in the vertical and horizontal directions are ensured, and all internal forces are transmitted to the foundation, meeting the vibration, bearing and deformation requirements of multiple molten salt pumps at high rotational speeds.

[0018] 2. Setting principle of the horizontal support members of the molten salt pump platform layer of the present utility model: It presents a "diagonal cross shape" as a whole on the plane. At the same time, for the molten salt pump support, continuous horizontal support should be ensured at each corner. The cross-sectional area of the angle steel arranged in the area close to the support is 1.5 - 2.0 times that of the angle steel section in the area far from the support. This layout scheme of the horizontal support system can significantly improve the torsional stiffness within the platform plane, and has the advantages of strong integrity and high economy.

[0019] 3. The composite steel beam of the present utility model is composed of an H-shaped steel beam, transverse and longitudinal stiffening rib plates, and the web of the section steel, and directly bears the base of the molten salt pump. This composite steel beam has the advantages of large torsional stiffness, high vertical and horizontal bearing capacities, and good effect in supporting the rotating shaft type pump equipment.

[0020] 4. The present utility model breaks through the adverse factors of the conventional cantilever support platform. According to the characteristics of the low-position and horizontal molten salt storage tank, it can well meet the vertical, horizontal and torsional stiffness requirements of the molten salt pump for its support structure. The platform form is simple, and the materials of the platform components are all made of steel, which is convenient for procurement and construction. Compared with other support structure forms, the construction period can be significantly shortened, and the project cost can be reduced. The support structure system of the present utility model has strong practicability in the field of solar thermal power generation station projects at home and abroad, and has broad application prospects in the field of new energy heat storage and thermal storage. Description of the Drawings

[0021] Figure 1 It is the plan view of the "U-shaped" pit wall of the present utility model.

[0022] Figure 2 It is the plan view of the molten salt pump support platform of the present utility model.

[0023] Figure 3 It is the plan view of the pipeline support platform of the present utility model.

[0024] Figure 4 It is the elevation view of the support structure system of the present utility model.

[0025] Figure 5 It is the schematic diagram of the composite steel beam of the pump support platform of the present utility model.

[0026] Figure 6 It is the connection schematic diagram of the composite steel beam and the horizontal support.

[0027] Figure 7 It is the connection schematic diagram of the wall column of the pit wall and the composite steel beam.

[0028] Figure 8 It is the connection schematic diagram of the wall column of the pit wall and the steel column.

[0029] Description of the Reference Numerals:

[0030] 1. Low-position molten salt storage tank; 2. Wall column; 3. Strip short wall; 4. Composite steel beam; 4-1. Longitudinal stiffening rib; 4-2 Transverse stiffening rib; 5. Horizontal support; 6. Steel column; 7. Steel beam; 8. Prefabricated steel anchor plate; W is beam width; H is beam height. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solution and advantages of the utility model clearer, the technical solution of the utility model will be clearly and completely described below in conjunction with the accompanying drawings of the utility model.

[0032] like Figures 1-8 As shown, a low-level molten salt storage tank and molten salt pump support structure system includes a pit wall structure, a tank support foundation, a pump support platform, and a pipeline support platform. The low-level molten salt storage tank 1 is placed horizontally (horizontally) in the pit wall structure, and two front and rear tank support foundations are arranged on the bottom plate of the pit wall structure. The low-level molten salt storage tank is arranged above the tank support foundation, and a pump support platform is arranged on the top side of the pit wall structure, and a pipeline support platform is arranged on the top surface of the pit wall structure.

[0033] The pit wall structure consists of a concrete floor, side walls and pilasters 2. The pit wall structure is "U-shaped" as a whole. The floor and side walls of the pit wall structure are cast in concrete as a whole, and corresponding stress-bearing steel bars are arranged inside to meet the bearing capacity and normal use requirements. On both sides of the side walls of the pit wall structure, pilasters 2 are arranged at regular intervals, and the pilasters 2 are arranged from top to bottom. Prefabricated steel anchor plates 8 are embedded in the top side and top surface of each pilaster 2. The prefabricated steel anchor plates 8 on the top side are used to fix the composite steel beams 4 of the pump support platform, and the prefabricated steel anchor plates 8 on the top surface are used to fix the steel columns 6 of the pipeline support platform.

[0034] The pilaster 2 and the side wall are cast as a whole, and the thickness of the pilaster 2 protrudes from the side wall by 300 to 400 mm. The pilaster 2 and the side wall form a "T-shaped" cross section as a whole. A prefabricated rectangular steel anchor plate is embedded in the top side of the pilaster 2, and a prefabricated square steel anchor plate is embedded in the top surface. The function of the pilaster 2 is to connect with the composite steel beam 4 of the pump support platform through the prefabricated rectangular steel anchor plate at the top. It is connected to the steel column 6 of the pipeline support platform through the prefabricated square steel anchor plate, which serves as a support for the horizontal steel beam 4 of the pump support platform and the steel column 6 of the pipeline support platform. The width of the concrete bottom plate of the pit wall structure is at least D+2x2m based on the outer diameter D of the low-level molten salt storage tank 1, that is, at least 2m wider on each side, and the length of the concrete bottom plate is at least L+3.5x2 based on the side length L of the low-level molten salt storage tank 1, that is, at least 3.5m more on each end. The height of the side wall is generally 6 to 9.0m.

[0035] The tank support foundation is a strip-shaped short wall 3 rising from the concrete bottom plate of the pit wall structure. Steel anchor plates and bolt holes are respectively arranged on the top surface of the strip-shaped short wall 3, realizing one-end fixed and one-end sliding connection with the saddle of the low-temperature molten salt storage tank 1. The length of the strip-shaped short wall 3 is adapted to the length of the saddle at the lower part of the molten salt storage tank 1, the height is 500 - 600 mm, and the thickness is 400 mm. The tank support foundations are arranged parallel to each other front and back and have the same height. A precast steel embedment is arranged on the top surface of one end of the tank support foundation and is welded and fixed to the saddle, and bolt holes are arranged on the top surface of the other end to realize sliding connection with the saddle bottom plate. During construction, the tank support foundation is poured together with the bottom plate of the pit wall structure, and bent-up steel bars are arranged in the support foundation to meet the stress requirements.

[0036] The pump support platform adopts the form of composite steel beams 4 + horizontal supports 5, and the pipeline support platform adopts the form of steel columns 6 + steel beams 7. According to the capacity and scale of the low-temperature molten salt storage tank 1, the height of the pit wall structure is 6 - 9.0 m, the pump support platform is 2.5 - 3.5 m higher than the top of the low-temperature molten salt storage tank 1, and the pipeline support platform is 3.5 - 5.0 m higher than the pump support platform.

[0037] The said pump support platform is composed of composite steel beams 4, horizontal supports 5, top surface steel plates, etc. The pump support platform is arranged on the top surface of the pit wall structure. According to the positioning of each molten salt pump, composite steel beams 4 are arranged around the pump bottom plate. The main body of the said composite steel beam 4 is an H-shaped steel beam, and transverse stiffeners 4-2 are welded at the middle positions of its upper and lower flanges, and at the same time, full-height vertical stiffeners 4-1 are welded at certain intervals. The transverse stiffeners 4-2 and the vertical stiffeners 4-1 together with the web of the H-shaped steel beam form the composite steel beam 4. The composite steel beams 4 around the pump bottom plate have the same height and are welded with their upper and lower flanges penetrated through each other to meet the requirement of strengthening the overall continuity. The beam width W of the composite steel beam 4 is generally 300 - 350, and the beam height H is generally 500 - 600 mm. The H-shaped composite steel beam 4 and the precast rectangular steel anchor plate on the side of the wall column 2 adopt equal-strength groove welds to realize rigid connection. This connection method can reliably transfer the bending moment and shear force borne by the H-shaped composite steel beam 4 to the wall column 2 and the side wall. The precast rectangular steel anchor plate here should be 50 - 80 mm wider than the side length of the H-shaped steel beam to meet the connection thickness of the weld. The said horizontal support 5 adopts equal-angle steel and is arranged diagonally and crosswise between the two composite steel beams 4. In particular, for the molten salt pump support, it should be ensured that there is a continuous horizontal support 5 at each corner, and it presents a "diagonal cross shape" as a whole in the plane. Each end of the horizontal support 5 is connected to the lower side of the upper flange plate of the composite steel beam 4 by fillet welds. The main function of the horizontal support 5 is to increase the stiffness of the plane. When the molten salt pump rotates at high speed, it has a beneficial effect on resisting horizontal displacement and torsion. The top surface steel plate adopts 5-mm thick diamond plate and is fully covered at all positions except the openings on the pump bottom plate, which is convenient for personnel to walk and for maintenance. The elevation of the pump support platform should be 2.5 - 3.5 m higher than the top of the low-temperature molten salt storage tank.

[0038] The pipeline support platform is composed of steel columns 6 and steel beams 7 of the pipeline layer. The steel column 6 adopts an I-shaped cross-section. The lower end of the steel column 6 is rigidly connected to the prefabricated square steel anchor plate on the top surface of the wall column 2 by a full-penetration weld around the perimeter. Here, the prefabricated square steel anchor plate on the top surface of the wall column 2 should be 50 - 80 mm wider than the I-shaped cross-section to meet the connection thickness of the weld. The top of the steel column 6 is connected with transverse and longitudinal steel beams 7. The lower part of the steel beam 7 supports and suspends the incoming and outgoing molten salt pipelines and other lifting pipelines. In the overall system, this realizes the functions of heat storage, heat exchange, and low-level storage of the low-temperature molten salt storage tank 1.

Claims

1. A low-position molten salt storage tank and molten salt pump support structure system, characterized in that: It includes a pit wall structure, in which a low-level molten salt storage tank is horizontally placed. Two front and rear tank body support foundations are arranged on the bottom plate of the pit wall structure, and the low-level molten salt storage tank is arranged above the tank body support foundation. A pump support platform is arranged on the top side of the pit wall structure, and a pipeline support platform is arranged on the top surface of the pit wall structure.

2. The low-position molten salt storage tank and molten salt pump support structure system according to claim 1 is characterized in that: The pit wall structure includes a concrete bottom plate and side walls, and presents a "U-shape" as a whole. The concrete bottom plate and the side walls are fixedly connected. Wall columns are arranged at a certain interval on both sides of the side walls. The wall columns are arranged from top to bottom. Prefabricated steel anchor plates are embedded in the top side faces and top surfaces of each wall column. The prefabricated steel anchor plates on the top side faces are used to fix the pump support platform, and the prefabricated steel anchor plates on the top surface are used to fix the pipeline support platform.

3. The low-position molten salt storage tank and molten salt pump support structure system according to claim 2 is characterized in that: The wall column is fixedly connected to the side wall, the wall column protrudes 300 to 400 mm from the side wall, the wall column and the side wall as a whole form a "T-shaped" cross-section, the top side of the wall column is pre-embedded with a prefabricated rectangular steel anchor plate, and the top surface is pre-embedded with a prefabricated square steel anchor plate.

4. The low-position molten salt storage tank and molten salt pump support structure system according to claim 1 is characterized in that: The tank body supporting foundation comprises a strip short wall, and the top surface of the strip short wall is respectively provided with a steel anchor plate and a bolt hole, which is fixed at one end and slidably connected to the saddle of the low-position molten salt storage tank at the other end.

5. The low-position molten salt storage tank and molten salt pump support structure system according to claim 3 is characterized in that: The pump support platform adopts the form of composite steel beam + horizontal support, the pipeline support platform adopts the form of steel column + steel beam, the height of the pit wall structure is 6 to 9.0 m, the pump support platform is 2.5 to 3.5 m higher than the top of the low-level molten salt storage tank, and the pipeline support platform is 3.5 to 5.0 m higher than the pump support platform.

6. The low-position molten salt storage tank and molten salt pump support structure system according to claim 5 is characterized in that: The main body of the composite steel beam is an H-shaped steel beam, and transverse stiffening ribs are welded in the middle position of the upper and lower flanges. At the same time, vertical stiffening ribs are welded at regular intervals. The transverse stiffening ribs, the vertical stiffening ribs and the web of the H-shaped steel beam together form a composite steel beam, and the composite steel beam is rigidly connected to the prefabricated rectangular steel anchor plate on the side of the wall column.

7. The low-position molten salt storage tank and molten salt pump support structure system according to claim 5 is characterized in that: The horizontal supports are made of equilateral angle steels and are arranged diagonally and crosswise between the two composite steel beams.

8. The low-position molten salt storage tank and molten salt pump support structure system according to claim 5, characterized in that: The steel column adopts an I-shaped cross section, the lower end of the steel column is rigidly connected to the prefabricated square steel anchor plate on the top surface of the wall column, and the top of the steel column is connected with transverse and longitudinal steel beams.

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