CN212006869U - Apron-shaped supporting type molten salt storage tank - Google Patents
Apron-shaped supporting type molten salt storage tank Download PDFInfo
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- CN212006869U CN212006869U CN202020204900.9U CN202020204900U CN212006869U CN 212006869 U CN212006869 U CN 212006869U CN 202020204900 U CN202020204900 U CN 202020204900U CN 212006869 U CN212006869 U CN 212006869U
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
The utility model relates to the technical field of fused salt storage tanks, in particular to an apron-shaped supporting type fused salt storage tank, which comprises a tank body, wherein a heat preservation layer is arranged outside the tank body, the tank body comprises a tank bottom plate, a tank top plate and a tank side wall, a bending surface is arranged on the tank bottom plate, a circle of the tank top plate is connected with the tank side wall, the tank side wall extends downwards from the top to form a bifurcation wall, the bifurcation wall comprises a vertical support wall and an inner oblique support wall, the vertical support wall extends downwards to a support plate II, and a circle of the vertical support wall is in an apron shape; an inner inclined supporting wall is arranged on the inner side of the vertical supporting wall, and the inner inclined supporting wall extends downwards to the supporting plate I and is connected with the tank bottom plate. The utility model discloses a perpendicular buttress a week is apron form and tank side wall from the top downwardly extending shape and becomes the bifurcation wall, can solve current fused salt storage tank wall and tank bottoms joint department and easily break and double-deck fused salt storage tank installation operation, maintenance duration and jar body high cost scheduling problem.
Description
Technical Field
The utility model relates to a fused salt storage tank technical field, in particular to apron form support formula fused salt storage tank.
Background
As a novel heat storage and energy storage technology, the fused salt energy storage is one of the most mainstream high-temperature heat storage technologies internationally at present, has the advantages of low cost, high heat capacity, good safety and the like, can be massively and centrally applied to the fields of photo-thermal power stations, new energy waste power utilization, power grid peak regulation, distributed smart energy, clean energy centralized heat supply, clean energy combined cooling, heating and power supply and the like, has wide prospects and is worthy of vigorous development.
The molten salt storage tank is an important part in a molten salt energy storage system, is used for storing high-temperature liquid molten salt, and has a large size specification. The reliability and safety of the molten salt storage tank are very important for the economic and reliable operation of the molten salt energy storage system.
At present, a plurality of rupture accidents occur worldwide, such as rupture accidents occurring in the early 2017 of the Gemasular photothermal power station in Spain; a leak accident occurred in 2016 (10 months) in us new-month sand dune photothermal power stations. The rupture or leakage of the molten salt storage tank generally causes the shutdown of the photo-thermal power station for months, and the benefit of the power station is seriously influenced.
For a large-scale high-temperature molten salt storage tank, the welding seam between the tank bottom plate and the tank wall is one of the positions most prone to cracking or cracking. The reason for this analysis is mainly:
1) the molten salt storage tank has large size specification and is easy to be damaged due to uneven heating, large thermal stress, thermal fatigue and the like. The material of the fused salt storage tank is generally stainless steel or carbon steel, when the fused salt temperature exceeds 400 ℃, the stainless steel is generally adopted, the thermal expansion coefficient of the stainless steel is larger, and in the working state, such as the fused salt storage tank of a photothermal power station, the working temperature range of the fused salt in the tank is generally 290 ℃ to 565 ℃, the long-term frequent change of the high-temperature fused salt temperature can cause the metal of the large-size tank body to be heated unevenly, and each part generates larger uneven expansion and contraction, thereby causing larger thermal stress, and generating thermal fatigue damage after multiple times of thermal expansion and cold contraction.
2) The welding seam of the bottom plate and the tank wall of the high-temperature molten salt storage tank bears all weight including the tank top plate, the tank top facility and the tank wall, meanwhile, frequent change of the temperature of the high-temperature molten salt causes the tank bottom plate and the tank wall to generate large uneven deformation which reciprocates for many times, and the deformation of the tank wall and the tank bottom plate generates superposition influence at the joint of the tank wall and the tank bottom plate, so that the joint, namely the welding seam of the tank wall and the tank bottom plate, has large and concentrated thermal stress.
Therefore, the welding seam between the tank wall and the tank bottom plate of the high-temperature molten salt storage tank is easily damaged due to the problems of large load, large thermal stress concentration and the like.
In order to solve the problems of uneven heating, large and concentrated thermal stress, thermal fatigue and the like of a large-size molten salt storage tank, three main technical schemes are provided at present.
1) The tank bottom plate is provided with a curved surface
In order to absorb partial expansion and contraction deformation of the storage tank bottom plate under the action of temperature change of high-temperature molten salt, the storage tank bottom plate is designed into a local curved surface or a curved surface of a full bottom plate. Although the technical scheme can absorb the deformation of the tank bottom plate to a certain degree, the thermal stress generated by the deformation can be still transmitted to the welding seam connecting the tank wall and the tank bottom plate, so that the thermal stress is concentrated; meanwhile, loads of the tank top plate, the tank top facility, the tank wall and the like still act on the welding seam where the tank wall is connected with the tank bottom plate in a concentrated mode. The superposition of the large concentrated load and the concentrated thermal stress can cause thermal fatigue damage to the welding seam, and further fracture occurs. Therefore, the problem that the welding seam between the wall and the bottom plate of the molten salt storage tank is easy to break is not fundamentally solved by the scheme.
2) Double-layer jacket molten salt storage tank
Set up double-deck jar wall in storage tank circumference, as shown in figure 3, outer wall and inner wall are perpendicular wall, and the tank deck acts on the outer wall, has certain distance between jar outer wall and the inner wall, hugs closely the outer wall inboard and has arranged jar body heat preservation, and the internal surface of jar body heat preservation inwards is the air interlayer to the inner wall outside, and the fused salt is stored in the space that is enclosed by the inner wall, and the inner tank roof hangs in the tank deck half through the jib and acts on the inner wall. However, under the double-layer jacket structure, although the inner wall and the tank bottom plate can expand and contract to a certain extent due to the existence of the air interlayer outside the inner wall, the inner wall and the tank bottom plate can still be heated unevenly due to the larger size of the storage tank, and further thermal stress is concentrated at a welding seam where the inner wall and the tank bottom plate are connected; meanwhile, the load of the inner wall and part of the inner tank top plate is still intensively acted on the welding seam. The superposition of concentrated thermal stress and concentrated load still leads to the easy thermal fatigue damage of the welding seam, and then the fracture occurs. Therefore, the problem that the welding seam between the wall and the bottom plate of the molten salt storage tank is easy to break is not fundamentally solved by the scheme.
3) Double-layer film molten salt storage tank
Set up double-deck film tank wall in storage tank circumference, as shown in figure 4, outer wall and inner wall are perpendicular wall, and the tank deck acts on the outer wall, has certain distance between outer wall and the inner wall, and jar body heat preservation is covered with the outer wall, whole space between the inner wall, and the fused salt is stored in the space of being enclosed by the inner wall, and inner tank roof hangs in the tank deck and acts on the inner wall through the jib, in addition, still is provided with expanding structure on inner wall and tank deck. According to the technical scheme, hard heat-insulating materials are fully distributed between the inner wall and the outer wall, the expansion deformation of the inner wall and the tank bottom plate is limited, and large concentrated thermal stress occurs at a welding seam where the inner wall is connected with the tank bottom plate; meanwhile, the load of the inner wall and part of the inner tank top plate is still intensively acted on the welding seam. The superposition of the large concentrated thermal stress and the concentrated load still causes the welding seam to be easy to generate thermal fatigue damage, and then the welding seam is cracked. Therefore, the problem that the welding seam between the wall and the bottom plate of the molten salt storage tank is easy to break is not fundamentally solved by the scheme.
In addition, for the double-layer jacket molten salt storage tank and the double-layer film molten salt storage tank, the inner tank top plate is subjected to the direct radiation effect of high-temperature molten salt, the temperature is high, a refractory fiber layer is arranged between the tank top plate and the inner tank top plate, the temperature is low, and the deformation of the inner tank top plate and the deformation of the tank top plate are inconsistent, so that the installation of related equipment such as a molten salt long-axis pump, a pipeline and the like is difficult, or the problems or risks such as damage caused by extrusion after installation and the like occur; the use amount of expensive austenite materials is not reduced in the double-wall tank body, and the use amount of carbon steel materials is greatly increased on the contrary by increasing the diameter of the outer-wall tank body, so that the total cost of the storage tank is increased; when the inner wall is damaged and leaks, the heat insulation material is distributed between the inner wall and the outer wall, the heat insulation material is difficult to remove, the heat dissipation of the high-temperature molten salt in the tank is slow, the waiting time in a maintainable state is long, the maintenance progress is influenced, and the economic loss is caused.
SUMMERY OF THE UTILITY MODEL
The utility model provides an in the correlation technique fused salt storage tank jar wall and tank bottoms board joint weld department easily break, the relevant equipment of double-deck fused salt storage tank easily receive the extrusion and damage, maintenance duration and jar body problem with high costs like installation difficulties such as fused salt long axis pump, pipeline after installing, provide an apron form support formula fused salt storage tank.
In order to solve the technical problem, the utility model discloses a realize through following technical scheme: an apron-shaped supporting type molten salt storage tank comprises a tank body, wherein a heat insulation layer is arranged outside the tank body, the tank body comprises a tank bottom plate, a tank top plate and a tank side wall, a bending surface is arranged on the tank bottom plate, the tank side wall extends downwards from the top to form a bifurcation wall, the bifurcation wall comprises a vertical support wall and an inner inclined support wall, the vertical support wall extends downwards from the starting point of the bifurcation wall to a support plate II, and one circle of the vertical support wall is in an apron shape; the inner side of the vertical supporting wall is provided with an inner oblique supporting wall, the inner oblique supporting wall extends downwards to the supporting plate I and is connected with the tank bottom plate, and the heat preservation layer is arranged outside the tank body on the ground.
Preferably, the vertical supporting wall is provided with a plurality of door holes at intervals along the circumferential direction, and the door holes are arranged upwards from the height of the tank bottom plate and are not higher than the height of the starting point of the bifurcation wall.
As a preferred scheme, the connection position of the inner oblique supporting wall and the vertical supporting wall is in a transition mode with gradually changed radian.
According to the preferable scheme, a tank bottom side heat preservation layer is arranged at the bottom of the heat preservation layer, a tank bottom side heat preservation protection plate is arranged on the outer side of the tank bottom side heat preservation layer, and the tank bottom side heat preservation layer and the tank bottom side heat preservation protection plate are both arranged on the supporting plate II.
According to the preferable scheme, the bottom of the tank bottom plate is sequentially provided with a ceramsite soil layer, a foundation layer, an expanded clay layer, a gravel layer and a reinforced concrete foundation from top to bottom, the supporting plate II is paved on the reinforced concrete foundation, and the supporting plate I is paved on the foundation layer.
According to the preferable scheme, the tank bottom side heat preservation protective plate is characterized by further comprising a ventilation pipe, wherein the ventilation pipe is shaped, penetrates through the ground and sequentially penetrates through the tank bottom side heat preservation protective plate, the tank bottom side heat preservation layer, the vertical supporting wall, the gravel layer, the vertical supporting wall on the opposite side, the tank bottom side heat preservation layer and the tank bottom side heat preservation protective plate, and finally penetrates out of the ground on the opposite side.
Compared with the prior art, the beneficial effects of the utility model are that: one circle of the vertical supporting wall of the utility model is in an apron shape, plays a role of supporting, and can effectively bear the downward partial pressure of the fused salt pressure on the tank top plate, the tank top facility, the tank wall load and the inner inclined supporting wall; the inner oblique supporting wall is welded with the tank bottom plate to form a molten salt storage tank body, the welding seam of the inner oblique supporting wall and the tank bottom plate does not need to bear the load of a tank top plate, a tank top facility and the tank wall any more, and the inner oblique supporting wall has a good compensation function on the expansion with heat and contraction with cold of the tank bottom plate, so that the thermal stress at the welding seam is smaller than that of the traditional storage tank, the double-layer jacket storage tank and the double-layer film storage tank, and the damage is not easy to generate; compared with a double-layer jacket storage tank and a double-layer film storage tank, the apron-shaped support type molten salt storage tank of the utility model has no inner tank top plate, and has no problem of inconsistent deformation of the tank top plate and the inner tank top plate, so that the problems or risks of difficult installation of the related facilities, damage in operation and the like are avoided; the total amount of materials is less, and the cost is reduced; no heat insulation material is arranged between the vertical supporting wall and the inner inclined supporting wall, and once the high-temperature molten salt leaks, the heat dissipation is fast after the heat insulation layer on the outer side of the tank body is removed, so that the maintenance progress is not influenced; the vertical supporting wall is provided with door holes at intervals along the circumferential direction, so that the maintenance is convenient.
Drawings
Fig. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is an expanded view of the vertical buttress of the present invention;
FIG. 3 is a schematic structural diagram of a double-jacketed molten salt storage tank;
FIG. 4 is a schematic structural diagram of a two-layer thin-film molten salt storage tank.
In the figure:
1. the tank comprises a tank side wall, 2a, a vertical supporting wall, 2b, an inner inclined supporting wall, 3, a tank bottom plate, 4, a bending surface, 5, a tank top plate, 6, a supporting plate I, 7, a tank bottom side heat insulation layer, 8, a tank bottom side heat insulation protecting plate, 9, a supporting plate II, 10, a heat insulation layer, 11, a ceramsite soil layer, 12, a base layer, 13, an expansion clay layer, 14, a gravel layer, 15, a reinforced concrete foundation, 16, a door hole, 17, a ventilating pipe, 18, a ground, a height of the tank bottom plate, b, a height of a branching wall starting point, 19, an outer wall, 20, an inner wall, 21, a hanging rod, 22, a refractory fiber layer, 23, an inner tank top plate, 24, a tank body heat insulation layer, 25, an air interlayer, 26, an inner tank bottom, 27, a tank bottom heat insulation layer, 28, an outer tank bottom.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present invention, and should not be construed as limiting the present invention.
As shown in fig. 1 to 2, an apron-shaped supporting type molten salt storage tank comprises a tank body, wherein a heat insulation layer 10 is arranged outside the tank body, the tank body comprises a tank bottom plate 3, a tank top plate 5 and a tank side wall 1, a bending surface 4 is arranged on the tank bottom plate 3, the tank side wall 1 extends downwards from the top to form a bifurcation wall, the bifurcation wall comprises a vertical branch wall 2a and an inner inclined branch wall 2b, the vertical branch wall 2a extends downwards from the starting point of the bifurcation wall to a support plate II 9, and one circle of the vertical branch wall 2a is in an apron shape; an inner inclined supporting wall 2b is arranged on the inner side of the vertical supporting wall 2a, the inner inclined supporting wall 2b extends downwards to the supporting plate I6 and is welded with the tank bottom plate 3, and the heat-insulating layer 10 is arranged outside the tank body on the ground 18.
From the foregoing, the apron-shaped periphery of the vertical supporting wall 2a can effectively bear the downward partial pressure of the molten salt pressure on the tank roof 5, the tank roof facilities, the tank wall load and the inner inclined supporting wall 2 b; interior oblique buttress wall 2b and tank bottoms board 3 welding form the fused salt storage tank jar body, and the welding seam of interior oblique buttress wall 2b and tank bottoms board 3 no longer need bear the load of tank deck board 5, tank deck facility and tank wall, and interior oblique buttress wall 2b has better compensation function to the expend with heat and contract with cold of tank bottoms board 3, and consequently this welding seam department thermal stress is little than traditional storage tank, double-deck jacket storage tank and double-deck film storage tank here thermal stress, difficult production damage. Generally, the bifurcated wall structure realizes the load transfer at the connecting welding seam between the side wall and the bottom plate of the tank, so that the side wall and the bottom plate of the tank are only under the action of thermal stress, and the problem that the welding seam of the high-temperature molten salt storage tank is easy to damage is solved.
As can be seen from the foregoing, the tank bottom plate 3 is provided with the curved surface 4, which can compensate for expansion and contraction deformation of the tank bottom plate 3 when the temperature of the high-temperature molten salt frequently changes to a certain extent.
Wherein, the included angle degree between the vertical branch wall 2a and the inner oblique branch wall 2b depends on:
1) and the material characteristics of the molten salt storage tank, such as linear expansion coefficient, allowable stress, hardness, toughness and the like.
2) And working characteristics of the molten salt in the storage tank, such as temperature distribution, volume change, height change and the like.
3) Structural properties of the bifurcation wall, including: firstly, the structural shape of the starting point of the bifurcation wall; the structural form of the inner oblique supporting wall 2 b; the wall thickness of the vertical supporting wall 2a and the wall thickness of the inner inclined supporting wall 2b are reduced; height of starting point of bifurcation wall, etc.
4) The requirement of the maintenance space between the inner oblique supporting wall 2b and the vertical supporting wall 2 a.
The stress characteristics and the stress characteristics of the starting point of the storage tank bifurcation wall, the vertical bifurcation wall 2a and the inner oblique bifurcation wall 2b are determined by the factors, and then the included angle degree of the bifurcation wall is determined to a certain extent, so that the technical personnel in the field can specifically calculate according to the actual production requirements, and the details are not repeated herein.
In one embodiment, the vertical supporting wall 2a is provided with a plurality of door holes 16 at intervals along the circumferential direction, the door holes 16 are arranged upwards from the height (the height indicated by a in fig. 2) of the tank bottom plate 3 and not higher than the height (the height indicated by b in fig. 2) of the starting point of the bifurcation wall, and the width of the door holes 16 is selected according to the criterion of convenient access of operation and maintenance personnel and small-sized detection and maintenance equipment.
In one embodiment, the connection between the inner oblique supporting wall 2b and the vertical supporting wall 2a is in a transition manner with gradually changing radian, so that the possibility of stress abrupt change and stress concentration at the connection can be reduced, and the stress distribution at the connection between the inner oblique supporting wall 2b and the vertical supporting wall 2a is more uniform.
In one embodiment, in order to further ensure the heat preservation performance of the tank body, a tank bottom side heat preservation layer 7 is arranged at the bottom of the heat preservation layer 10, a tank bottom side heat preservation guard plate 8 is arranged outside the tank bottom side heat preservation layer 7, the other side of the tank bottom side heat preservation guard plate 8 is an underground soil wall, the tank bottom side heat preservation guard plate 8 plays a role of a retaining wall, and the tank bottom side heat preservation layer 7 and the tank bottom side heat preservation guard plate 8 are both arranged on a support plate II 9.
In one embodiment, the bottom of the tank bottom plate 3 is sequentially provided with a ceramsite soil layer 11, a base layer 12, an expanded clay layer 13, a gravel layer 14 and a reinforced concrete foundation 15 from top to bottom, a support plate II 9 is paved on the reinforced concrete foundation 15, and a support plate I6 is paved on the base layer 12.
In order to cool the tank bottom foundation, the apron-shaped supporting type molten salt storage tank in the embodiment further comprises a ventilation pipe 17, wherein the ventilation pipe 17 is in a shape, penetrates through the tank bottom side heat-insulating protection plate 8, the tank bottom side heat-insulating layer 7, the vertical supporting wall 2a, the gravel layer 14, the opposite vertical supporting wall 2a, the tank bottom side heat-insulating layer 7 and the tank bottom side heat-insulating protection plate 8 from the ground 18, and finally penetrates out of the opposite ground 18.
In one embodiment, according to the calculation results of the stress and stress at the joint of the inner inclined supporting wall 2b and the vertical supporting wall 2a, a straight plate which is simpler to process can be adopted to save materials; the lower concave plate with a certain radian can be adopted, so that the stress distribution is more uniform, the stress at the joint of the inner oblique supporting wall 2b and the vertical supporting wall 2a is reduced, and the stress of a welding seam at the joint of the inner oblique supporting wall 2b and the tank bottom plate 3 is reduced, so that the storage tank is safer, and the service life is prolonged.
In one embodiment, the wall thickness of the vertical buttress 2a and the inner oblique buttress 2b from the beginning of the bifurcation wall downwards can be in the form of uniform wall thickness or gradually thickened wall thickness according to the calculation results of the stress and the stress of the vertical buttress 2a and the inner oblique buttress 2 b.
In addition, the heat-insulating layer 10 is arranged on the outer side of the tank body above the ground 18, no heat-insulating material is arranged between the vertical supporting wall 2a and the inner inclined supporting wall 2b, once high-temperature molten salt leaks, the heat dissipation is fast after the heat-insulating layer 10 on the outer side of the tank body is removed, and the maintenance progress is not influenced.
The above is the preferred embodiment of the present invention, and the technical personnel in the field of the present invention can also change and modify the above embodiment, therefore, the present invention is not limited to the above specific embodiment, and any obvious improvement, replacement or modification made by the technical personnel in the field on the basis of the present invention all belong to the protection scope of the present invention.
Claims (6)
1. The utility model provides an apron form support formula molten salt storage tank, includes a jar body, jar external portion is provided with heat preservation (10), jar body is including tank bottoms board (3), jar roof board (5) and jar lateral wall (1), be provided with curved surface (4), its characterized in that on tank bottoms board (3): the tank side wall (1) extends downwards from the top to form a bifurcation wall, the bifurcation wall comprises a vertical support wall (2a) and an inner inclined support wall (2b), the vertical support wall (2a) extends downwards from the starting point of the bifurcation wall to a support plate II (9), and one circle of the vertical support wall (2a) is in an apron shape; the inner side of the vertical supporting wall (2a) is provided with an inner inclined supporting wall (2b), the inner inclined supporting wall (2b) extends downwards to the supporting plate I (6) and is connected with the tank bottom plate (3), and the heat-insulating layer (10) is arranged outside the tank body on the ground (18).
2. The apron-like supported molten salt storage tank of claim 1, characterized in that: the vertical supporting wall (2a) is provided with a plurality of door holes (16) at intervals along the circumferential direction, and the height of the door holes (16) from the bottom plate (3) of the tank is not higher than the starting point of the bifurcation wall.
3. The apron-like supported molten salt storage tank of claim 1, characterized in that: the connection part of the inner oblique supporting wall (2b) and the vertical supporting wall (2a) is in a transition mode with gradually changed radian.
4. The apron-like supported molten salt storage tank of claim 1, characterized in that: the tank bottom side heat preservation layer (7) is arranged at the bottom of the heat preservation layer (10), the tank bottom side heat preservation guard plate (8) is arranged on the outer side of the tank bottom side heat preservation layer (7), and the tank bottom side heat preservation layer (7) and the tank bottom side heat preservation guard plate (8) are both arranged on the support plate II (9).
5. The apron-like supported molten salt storage tank of claim 4, characterized in that: the bottom of the tank bottom plate (3) is sequentially provided with a ceramsite soil layer (11), a foundation layer (12), an expanded clay layer (13), a gravel layer (14) and a reinforced concrete foundation (15) from top to bottom, the supporting plate II (9) is paved on the reinforced concrete foundation (15), and the supporting plate I (6) is paved on the foundation layer (12).
6. The apron-like supported molten salt storage tank of claim 5, characterized in that: still include ventilation pipe (17), ventilation pipe (17) are the shape, penetrate and pass jar bottom side heat preservation backplate (8) in proper order from ground (18), tank bottoms side heat preservation (7), perpendicular buttress wall (2a), rubble layer (14) and offside perpendicular buttress wall (2a), tank bottoms side heat preservation (7), tank bottoms side heat preservation backplate (8), wear out from offside ground (18) at last.
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| CN202020204900.9U CN212006869U (en) | 2020-02-25 | 2020-02-25 | Apron-shaped supporting type molten salt storage tank |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111174620A (en) * | 2020-02-25 | 2020-05-19 | 中国电力工程顾问集团华东电力设计院有限公司 | Apron-shaped supporting type molten salt storage tank |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111174620A (en) * | 2020-02-25 | 2020-05-19 | 中国电力工程顾问集团华东电力设计院有限公司 | Apron-shaped supporting type molten salt storage tank |
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