CN113883730A

CN113883730A - Heat storage device for tower type photo-thermal power station

Info

Publication number: CN113883730A
Application number: CN202010619701.9A
Authority: CN
Inventors: 黄其; 章晓敏; 宓霄凌
Original assignee: Zhejiang Cosin Solar CSP Technology Research Institute Co Ltd
Current assignee: Zhejiang Cosin Solar CSP Technology Research Institute Co Ltd
Priority date: 2020-07-01
Filing date: 2020-07-01
Publication date: 2022-01-04

Abstract

The invention discloses a heat storage device for a tower type photo-thermal power station, which comprises: the device comprises a main body, wherein an accommodating cavity is formed in the main body; the solid heat storage component is arranged in the accommodating cavity; the fluid inlet is arranged on the main body and used for introducing heat exchange fluid into the accommodating cavity; the heat supply member is arranged in the accommodating cavity, and a heat supply working medium is introduced into the heat supply member; the fluid outlet is arranged on the main body and used for the outflow of the heat exchange fluid; the heat exchange fluid in the accommodating cavity is in contact with the heat supply member and the solid heat storage member, and absorbs and stores heat of the heat supply working medium; the solid heat storage component absorbs and stores the heat of the heat supply working medium through the heat exchange fluid conduction, or the heat exchange fluid absorbs and stores the heat released by the solid heat storage component. The device has stable and reliable heat storage structure and low cost.

Description

Heat storage device for tower type photo-thermal power station

Technical Field

The invention belongs to the technical field of solar photo-thermal power generation, and particularly relates to a heat storage device for a tower type photo-thermal power station.

Background

The heat storage device is a core device of a tower-type photothermal power station, and stores heat when sunlight is sufficient, and releases heat in a period of insufficient sunlight such as at night, so as to realize continuity of power output. The performance of the heat storage device therefore determines the continuity of the power output, and therefore the heat storage device is of great interest.

The existing heat storage device has various heat storage modes, including molten salt heat storage and solid heat storage, but the heat storage cost of molten salt heat storage unit is higher than that of solid heat storage, and solid heat storage is a relatively cheap heat storage mode, and has been widely researched and tried in academic and industrial fields.

However, with current solid heat storage technologies, there are significant problems: 1. the heat exchange tube is in direct contact with a solid, and as the temperature rises, the solid structure is cracked due to the difference of thermal expansion coefficients; 2. the solids are mutually extruded due to thermal expansion, so that the structure is damaged; 3. at present, gas and solid exchange heat, but the heat exchange efficiency is lower.

Disclosure of Invention

In order to solve the above problems, an object of the present invention is to provide a heat storage device for a tower-type photothermal power station, which has a stable and reliable heat storage structure and a low cost.

In order to achieve the purpose, the technical scheme of the invention is as follows:

the device comprises a main body, wherein an accommodating cavity is formed in the main body;

the solid heat storage component is arranged in the accommodating cavity;

the fluid inlet is arranged on the main body and used for introducing heat exchange fluid into the accommodating cavity;

the heat supply member is arranged in the accommodating cavity, and a heat supply working medium is introduced into the heat supply member;

the fluid outlet is arranged on the main body and used for the outflow of the heat exchange fluid;

the heat exchange fluid in the accommodating cavity is in contact with the heat supply member and the solid heat storage member, and absorbs and stores heat of the heat supply working medium; the solid heat storage component absorbs and stores the heat of the heat supply working medium through the heat exchange fluid conduction, or the heat exchange fluid absorbs and stores the heat released by the solid heat storage component.

According to an embodiment of the present invention, the solid heat storage member includes a plurality of solid heat storage layers, the heat supply member includes a plurality of heat exchange tubes, and a plurality of heat exchange tubes are disposed between adjacent solid heat storage layers.

According to an embodiment of the invention, the plurality of layers of solid heat storage layers are vertically stacked.

According to an embodiment of the present invention, adjacent solid heat storage layers are in contact with each other and are matched to form a plurality of accommodating channels, the heat exchange tube is inserted into the accommodating channels, a gap is provided between the heat exchange tube and the accommodating channels, the gap is filled with the heat exchange fluid, the solid heat storage layers are provided with vertical channels, and the heat exchange fluid enters the accommodating channels through the vertical channels.

According to an embodiment of the present invention, each solid heat storage layer includes a plurality of solid heat storage units, each solid heat storage unit is provided with a channel groove, and the channel grooves of the solid heat storage units in adjacent layers cooperate to form the accommodating channel.

According to an embodiment of the present invention, the fluid inlet is provided in plurality and respectively provided at the top and the side of the main body.

According to an embodiment of the present invention, a vertical inlet is formed at the top of the main body, and a plurality of horizontal inlets are formed at the side surface of the main body.

According to an embodiment of the present invention, the horizontal inlet is disposed between the heat exchange tube and the solid heat storage layer and above the heat exchange tube.

According to an embodiment of the invention, the heat exchange tube is a corrugated tube.

According to an embodiment of the invention, the outer wall of the corrugated pipe is provided with a plurality of spurs, and the spurs are arranged at the joint of the corrugated pipe and the straight pipe section.

According to an embodiment of the invention, the solid heat storage unit is a mixture of refractory bricks or a solid iron-based material, and the solid heat storage unit is provided with a plurality of through holes to form the vertical channels.

According to an embodiment of the invention, a buffer material is arranged between adjacent solid heat storage units.

Due to the adoption of the technical scheme, compared with the prior art, the invention has the following advantages and positive effects:

(1) the embodiment of the invention is provided with a main body, a solid heat storage component, a fluid inlet, a fluid outlet and a heat supply component, wherein heat exchange fluid absorbs heat of a heat supply working medium heated by a heating device of the tower type photo-thermal power station, when sunlight is sufficient, the heat exchange fluid transfers part of heat of the heat supply working medium to the solid heat storage component for storage, and when the sunlight is insufficient, the solid heat storage component reversely transfers the heat to the heat exchange fluid, so that the heat exchange fluid is always kept at a proper working temperature. The heat is stably and continuously supplied by combining the heat exchange fluid and the solid heat storage component, continuous power generation is guaranteed, the amount of the heat exchange fluid is saved by the solid heat storage component, and the cost is saved. The heat exchange fluid is in contact heat exchange with the heat supply component and in contact heat exchange with the solid heat storage component, so that the heat exchange fluid becomes a heat exchange medium of the heat supply component and the solid heat storage component, the heat supply component and the solid heat storage component are not required to be in direct contact, the problem of breakage of the solid heat storage component caused by the difference of the thermal expansion coefficients after the solid heat storage component is in direct contact with the heat supply component is avoided, and the integral structure is more stable and reliable.

(2) In the embodiment of the invention, the solid heat storage component comprises a plurality of solid heat storage layers, and a plurality of heat exchange pipes are arranged between adjacent solid heat storage layers, namely the solid heat storage layers and the heat exchange pipes are sequentially arranged at intervals in the vertical direction. The interval arrangement can ensure that the heat of the solid heat storage layer is fully utilized. And the heat exchange fluid is arranged at intervals, the turbulence degree of the heat exchange fluid flowing can be improved, the turbulent flow is enhanced, the convection heat exchange is facilitated, and the heat storage efficiency of the heat exchange fluid can be correspondingly improved.

(3) In the embodiment of the invention, the solid heat storage layers are mutually contacted and matched to form a plurality of accommodating channels, and the heat exchange tubes are arranged in the accommodating channels in a penetrating manner, so that heat exchange is carried out on the heat exchange fluid in the accommodating channels, and the disturbance of vertical heat exchange fluid flow and horizontal heat exchange fluid flow can be increased.

(4) In the embodiment of the invention, the fluid inlets comprise the vertical inlet and the horizontal inlet, so that the heat exchange fluid enters from the vertical direction and the horizontal direction at the same time, the vertical heat exchange fluid flow and the horizontal heat exchange fluid flow are crossed with the heat exchange tubes, the disturbance of the heat exchange fluid is severe, the heat transfer is enhanced, and the heat exchange fluid can better absorb the heat of the heat supply working medium.

(5) In the embodiment of the invention, the heat exchange tube is a corrugated tube, which is beneficial to improving the heat exchange area; on the other hand, the periodic convex design is beneficial to transverse incoming flow, forms vortex motion between nodes, increases fluid disturbance and enhances heat transfer. In addition, the corrugated pipe is provided with the spurs, and the spurs can enable heat exchange fluid to form vortex motion between the corrugated pipes, increase fluid disturbance and strengthen heat transfer.

(6) In the embodiment of the invention, the solid heat storage unit is a mixture consisting of refractory bricks or solid iron-based materials, and the refractory bricks are practical and have low cost. And a buffer material is arranged between the refractory bricks, so that the refractory bricks are prevented from being extruded and broken mutually due to thermal expansion. The refractory brick is also provided with a vertical through hole to form a vertical channel, and the vertical through hole can weaken the influence of high-temperature deformation on the structure of the refractory brick; on the other hand, the vertical flow channel of the vertical through hole is beneficial to the passing of heat exchange fluid, and meanwhile, the cross flow is formed by matching with the heat exchange fluid flowing horizontally, so that the heat transfer is enhanced.

Drawings

The following detailed description of embodiments of the invention is provided in conjunction with the appended drawings, in which:

FIG. 1 is a schematic view of a heat storage apparatus for a tower-type photothermal power plant according to the present invention;

FIG. 2 is a schematic view of a node tube of a heat storage device for a tower-type photothermal power station according to the present invention;

FIG. 3 is a schematic view showing the connection of heat transfer and exchange systems of a tower type photothermal power station of the heat storage device for the tower type photothermal power station of the present invention;

FIG. 4 is a schematic view of a liquid-separating plate of a heat storage device for a tower-type photothermal power station according to the present invention;

FIG. 5 is a partial side sectional view of a heat storage device for a tower-type photothermal power station of the present invention;

FIG. 6 is a top view of a refractory brick of a heat storage apparatus for a tower-type photothermal power station according to the present invention;

FIG. 7 is a front view of refractory bricks of a heat storage apparatus for a tower-type photothermal power station according to the present invention;

description of reference numerals:

1: a main body; 2: an accommodating cavity; 3: a refractory brick; 4: a vertical inlet; 5: a nodal tube; 6: a fluid outlet; 7: a solid heat storage layer; 8: a dispenser; 9: a main pipe; 10: a branch pipe; 11: a nozzle; 12: a flaring assembly; 13: a liquid separation plate; 14: a cache cavity; 15: a heating assembly; 16: bur protruding; 17: a node; 18: a straight pipe section; 19: a buffer material; 20: a molten salt header pipe; 21: a central bore; 22: a secondary fence hole; 23: a third-level fence hole; 24: a heat supply working medium header pipe; 25: a power generation heat exchange pipeline; 26: a heat storage device for a tower-type photothermal power station; 27: a horizontal inlet; 28: an accommodating channel; 29: a vertical through hole; 30: a channel groove.

Detailed Description

The invention is described in further detail below with reference to the figures and specific examples. Advantages and features of the present invention will become apparent from the following description and from the claims. It is to be noted that the drawings are in a very simplified form and are all used in a non-precise ratio for the purpose of facilitating and distinctly aiding in the description of the embodiments of the invention.

Referring to fig. 1 to 4, the core of the present invention is to provide a heat storage apparatus for a tower-type photothermal power station, comprising a main body 1, a solid heat storage member, a fluid inlet, a heat supply member and a fluid outlet 6. The solid heat storage component and the heat supply component are arranged in the accommodating cavity 2 of the main body 1, the fluid inlet is used for introducing heat exchange fluid into the accommodating cavity 2, and the heat exchange fluid enters the accommodating cavity 2 in the main body 1 from the fluid inlet and then contacts with the heat supply component and the solid heat storage component for heat exchange.

The heat exchange fluid is the fused salt in this embodiment, has realized thermal stability and continuous supply through the combination of fused salt with solid heat accumulation component, has guaranteed continuous power generation, and the setting up of solid heat accumulation component has practiced thrift the quantity of fused salt, has practiced thrift the cost. The fused salt and the heat supply component contact heat transfer, fused salt and solid heat accumulation component contact heat transfer for the fused salt becomes the heat transfer intermediary of heat supply component and solid heat accumulation component, and unnecessary direct contact of heat supply component and solid heat accumulation component has avoided the solid heat accumulation component problem of breaking that causes because of the thermal expansion coefficient difference after solid heat accumulation component and the direct contact of heat supply component, makes overall structure more reliable and more stable.

The heat supply working medium in the heat supply member absorbs heat from the heating device of the tower type photo-thermal power station, then flows through the accommodating cavity 2 through the heat supply member, and then conducts the heat to the molten salt. When sufficient molten salt absorbs enough heat from the heat supply working medium, the molten salt conducts part of heat of the heat supply working medium to the solid heat storage component for storage, and when the sunlight is insufficient, the solid heat storage component conducts the heat to the molten salt in a reverse mode, so that the temperature of the molten salt is in a relatively balanced numerical value, and the overall heat transfer efficiency is improved. Finally, the molten salt flows out of the fluid outlet 6 and enters a generator set of the tower type photo-thermal power station to release heat and generate power, and the heat supply working medium is liquid metal in the embodiment.

The fused salt is a fused mass formed after the salt is melted, and is widely applied to the heat storage device of the existing tower type photo-thermal power station. The heat storage process of the tower type photo-thermal power station is to heat and raise the temperature of the molten salt on the basis of the molten salt formed after the salt is melted, and to store heat energy by utilizing the sensible heat of the temperature rise. During power generation, the molten salt temperature is used for cooling and heating water or steam to generate power, and the whole process of molten salt is completed in a molten state.

The main body 1 is a heat storage tank, and the accommodating cavity 2 is arranged inside the heat storage tank. Still be equipped with fluid inlet and fluid outlet 6 on the main part 1, fluid outlet 6 locates the main part 1 bottom, is used for letting in fused salt and the outflow that is used for the fused salt in to holding chamber 2 respectively. The fluid inlet is provided with a plurality of inlets respectively arranged at the top and the side of the main body, in particular, comprises a vertical inlet 4 at the top and a plurality of horizontal inlets 27 at the side. Molten salt enters the accommodating chamber 2 from both the vertical inlet 4 and the horizontal inlet 27.

The solid heat accumulation component comprises a plurality of solid heat accumulation layers, the heat supply component comprises a plurality of heat exchange tubes, heat supply working media are communicated in the heat exchange tubes, a plurality of heat exchange tubes are arranged between adjacent solid heat accumulation layers, the plurality of solid heat accumulation layers are arranged in the embodiment in a vertically stacked mode, namely, each layer of heat exchange tubes and each solid heat accumulation layer are arranged in a vertically formed interval mode. Referring to fig. 1, in the present example, six solid heat storage layers 7 and five heat exchange tube layers are provided in total, and the uppermost layer and the lowermost layer are both solid heat storage layers 7. The heat supply working medium absorbs heat from a heating device of the tower type photo-thermal power station, exchanges heat with molten salt through the heat exchange tube, and then circularly flows back to the heating device.

Further, referring to fig. 5, adjacent solid heat storage layers are in contact with each other and are matched to form a plurality of accommodating channels 28, the heat exchange tubes are arranged in the accommodating channels 28 in a penetrating manner, the solid heat storage layers are provided with vertical channels, and heat exchange fluid enters the accommodating channels 28 through the vertical channels and fills gaps between the heat exchange tubes and the accommodating channels 28. And a plurality of accommodating channels 28 and heat exchange tubes are provided at the same level.

Specifically, each solid heat storage layer is composed of a plurality of solid heat storage units, in this embodiment, the solid heat storage units are refractory bricks 3, in other embodiments, other types of solid heat storage materials, such as a mixture composed of solid iron-based materials, may also be used, referring to fig. 5, each solid heat storage layer 7 is formed by tightly stacking a plurality of refractory bricks 3.

Referring to fig. 7, the firebricks 3 are provided with passage grooves 30, the passage grooves 30 are semicircular grooves, and the passage grooves 30 of the firebricks of adjacent layers cooperate to form the receiving passage 28, i.e., two semicircles form a complete circular passage. One accommodating passage 28 may be formed between every two solid heat storage layers, or two accommodating passages 28 may be formed between every two solid heat storage layers.

Referring to fig. 6, the refractory brick 3 is provided with a plurality of vertical through holes 29 to form vertical channels, the vertical through holes are used as vertical flow channels to facilitate molten salt passage, and can ensure the stability of the structure of the refractory brick 3 after temperature rise and thermal expansion, and weaken the influence of high temperature deformation on the structure of the refractory brick, namely, the vertical through holes 29 can be expanded in the past to prevent the expansion crack caused by extrusion on the periphery. The refractory bricks 3 in this embodiment are therefore arranged in vertical through-holes rather than in the form of straight spigots.

The horizontal inlet 27 is disposed between the heat exchange tube and the solid heat storage layer and located in the accommodating channel 28, and the horizontal inlet 27 is disposed above the heat exchange tube, that is, above the accommodating channel 28. Each receiving channel 28 is provided with one horizontal inlet 27, that is, a plurality of horizontal inlets 27 are arranged between adjacent solid heat storage layers 7 at the same horizontal level.

Each horizontal inlet 27 is also provided with a nozzle 11, and the nozzle 11 can increase the flow speed of the molten salt entering the accommodating channel 28, so that the molten salt fluid is disturbed violently to enhance heat transfer.

Molten salt simultaneously enters the accommodating channel 28 from the vertical inlet 4 and the horizontal inlet 27, so that the molten salt entering from the vertical inlet 4 enters the accommodating channel 28 through the vertical channel to form vertical molten salt flow, the molten salt entering the accommodating channel 28 from the horizontal inlet 27 forms horizontal molten salt flow, the vertical molten salt flow and the horizontal molten salt flow are crossed with the heat exchange tube, the molten salt fluid is disturbed violently, and the heat transfer is strengthened, so that the molten salt can better absorb the heat of a heat supply working medium.

In this embodiment, the heat exchange tube is a corrugated tube 5, the corrugated tube 5 is horizontally arranged in the accommodating channel 28, and the corrugated tube 5 includes a circular arc-shaped corrugated node 17 and a straight tube section 18, which is beneficial to improving the heat exchange area and improving the heat absorption efficiency of the molten salt. And the horizontal molten salt flow is matched with the periodically raised nodes 17 of the node pipe 5, so that the vortex motion is formed among the nodes 17, and the fluid disturbance is increased, so that the heat transfer is enhanced.

In a further embodiment, referring to fig. 2, the outer wall of the corrugated pipe 5 is provided with a plurality of conical spurs 16, the spurs 16 are arranged at the joints of the corrugated nodes 17 and the straight pipe sections 18 of the corrugated pipe 5, and the height of the spurs 16 is less than or equal to the radius difference between the maximum diameter of one half of the corrugated nodes 17 and the straight pipe sections 18. The burs 16 can make the molten salt form vortex motion between the nodes 17, increase the fluid disturbance and strengthen the heat transfer. The burs 16 also increase the heat exchange area of the outer surface of the nodal tubes 5.

The function principle of the spurs 16 is as follows: the vertical direction of the molten salt is gravity-guided natural flow, the molten salt in the horizontal flow direction is influenced by the spray pipe, the flow velocity of the molten salt is large, the molten salt flowing between the adjacent solid heat storage layer 7 and the heat exchange layer is mainly transverse flow, a background step flow form can be formed at the joint of the node 17 and the straight pipe section 18 (namely, vortex is formed at the joint to cause the detention of molten salt fluid), and due to the existence of the spurs 16, a vortex flow detention area formed by the background step flow can be broken, full disturbance is formed, and convection heat exchange is strengthened.

Referring to fig. 2, the height of the spur 16 is H and the difference in radius between the half-node 17 maximum diameter and the straight tube section 18 is H. And preferably, the length B of the wave nodes 17 is greater than the length A between the wave nodes 17, and the arrangement ensures the sufficient heat exchange area of the outer surface of the wave node pipe 5.

In a further embodiment, a buffer material 19 is disposed between each adjacent refractory brick 3, and may be made of graphene, aluminum foil, or other materials, so as to ensure structural stability between the refractory bricks 3. Since the refractory bricks 3 have a large thermal expansion coefficient and are largely deformed under high temperature conditions, the buffer material 19 is used between the refractory bricks 3 to ensure structural stability, and when the refractory bricks 3 are deformed, the buffer material 19 is contracted accordingly. In addition, the buffer material 19 has good specific heat capacity and thermal conductivity, and contributes to heat storage/exchange of the refractory bricks 3. In addition, the vertical through holes 29 of the refractory bricks 3 are matched with the transverse accommodating channels 28, so that the molten salt flowing down from the vertical through holes 29 and the molten salt flowing into the accommodating channels 28 from the horizontal inlets 27 form cross flow, and the heat transfer is enhanced. That is to say, strong fluid disturbance can be formed between the refractory bricks 3 and the nodal tubes 5, so that the molten salt can absorb more heat of the heat supply working medium in the nodal tubes 5.

In this embodiment, the firebrick 3 and the bellows 5 are not in direct contact, and the intermediary between the two is molten salt, can realize filling/releasing heat and go on in step, realize continuous operation, and the benefit of overall arrangement like this lies in: the problem of cracking of the refractory bricks 3 caused by the difference of the thermal expansion coefficients after the refractory bricks 3 are directly contacted with the corrugated pipe 5 is avoided. And the refractory bricks 3 are fully contacted with the molten salt by the interval arrangement mode, so that the heat of the refractory bricks 3 is fully utilized, and the uniformity of the temperature of each refractory brick 3 can be realized.

Moreover, the corrugated pipes 5 are arranged in a plurality of rows and cross the main body 1, so that the independence between the corrugated pipes 5 is ensured, and the influence of the fault of a single corrugated pipe 5 on the whole device is avoided.

Secondly, the turbulence degree that bellows pipe 5 and solid heat accumulation layer interval were arranged and are made the fused salt flow can promote, and the fused salt carries out the circulation flow at holding chamber 2, has guaranteed the fused salt fluid torrent form in the holding chamber 2, makes the vortex strengthen, helps the convection heat transfer, and fused salt heat-retaining efficiency also can corresponding promotion. Because if the firebricks 3 are all arranged at the bottom, the corrugated pipe 5 is arranged at the upper part, the firebricks 3 at the upper part firstly contact with the fused salt to utilize the heat, and the firebricks 3 far away from the fused salt region need to transport the heat to the fused salt part through heat conduction, the heat loss is large and the heat transfer efficiency is low, and when the firebricks 3 store heat, the initial heat storage temperature is relatively uneven, the firebricks 3 at the upper part are often high in temperature and low in the temperature of the bottom region, and the solid structure is unstable due to different thermal stress impacts. Therefore, the above problems can be effectively avoided by adopting the interval arrangement.

The distributor 8 is a common fluid flow distributor 8, is provided with a plurality of outlets, and can distribute the flow of each outlet. The distributor 8 is connected with a molten salt main pipe 20, the distributor 8 is respectively communicated with the vertical inlet 4 and each horizontal inlet 27 through a main pipe 9 and a plurality of branch pipes 10, and the molten salt enters the distributor 8 and then respectively enters the vertical inlet 4 and each horizontal inlet 27 through flow regulation and control. The finer branch pipes 10 also accelerate the horizontal flow rate of the molten salt.

In a further embodiment, a hollow flaring assembly 12 is included, the opening of the lower end of the flaring assembly 12 is larger than the opening of the upper end of the flaring assembly 12, that is, the opening of the flaring assembly 12 is enlarged from top to bottom, and the vertical inlet 4 is communicated with the upper end of the flaring assembly 12. The flaring component 12 is small in upper portion and large in lower portion, so that pressure reduction treatment can be performed when molten salt enters the accommodating cavity 2, impact on the structure in the accommodating cavity 2 caused by overhigh fluid pressure of the molten salt in the main pipe 9 can be weakened, and the lower layer of the flow direction of the molten salt which can be uniformly dispersed relatively can be ensured.

The molten salt flaring device further comprises a liquid distribution plate 13 arranged at the top of the accommodating cavity 2, wherein the liquid distribution plate 13 is provided with a plurality of liquid distribution holes, and the molten salt flows down from the flaring component 12 and then flows down through the liquid distribution plate 13. The liquid separation plate 13 has a certain blocking effect on the vertically entering molten salt, and the impact force of the molten salt is weakened, so that the structure in the accommodating cavity 2 is protected to a certain extent; in addition, the liquid distribution plate 13 is provided with a plurality of liquid distribution holes, so that the molten salt can be vertically distributed into the lower layer structure relatively uniformly.

Specifically, the periphery of the liquid separation plate 13 is of an upward-inclined structure, that is, the periphery of the liquid separation plate 13 is high and the middle of the liquid separation plate is low, so that the concentration of the molten salt to the center of the liquid separation plate 13 is facilitated, and the molten salt overflow is avoided. The liquid separating holes comprise a central hole 21, a plurality of secondary fence holes 22 uniformly distributed around the circumference of the central hole 21 and a plurality of tertiary fence holes 23 uniformly distributed around the circumference of the central hole 21. From the central hole 21 to the fence holes of each level, the hole diameter is increased according to the proportion of 1.05 to 1.1 from inside to outside. The arrangement mode of the round holes and the hole diameters is beneficial to keeping the flow of the molten salt flowing downwards through the holes consistent after the molten salt flows downwards to the liquid separation plate 13. This is because the flow velocity of the molten salt gradually decreases from the center to the periphery, and as the pore diameter increases, the flow cross section increases, so that the flow rate through each pore per unit time remains relatively uniform.

The bottom of main part 1 still is equipped with the buffer memory chamber 14 with holding chamber 2 intercommunication, and buffer memory chamber 14 is equipped with heating element 15, and fluid outlet 6 locates the chamber wall of buffer memory chamber 14 and fused salt flows out through buffer memory chamber 14, and heating element 15 opens when fused salt temperature is less than the threshold value to the heating fused salt. The buffer cavity 14 can buffer the molten salt, and when the temperature of the molten salt cannot reach the preset threshold temperature, the auxiliary heating is carried out through the heating component 15 in time in order to maintain the continuous operation of the system.

The working process of the present invention is further explained as follows:

firstly, a heat supply working medium absorbs solar energy from a heating device of the tower type photo-thermal power station, and the heat supply working medium after heat absorption enters the corrugated pipe 5 through the heat supply working medium header pipe 24 so as to enter the heat storage device of the embodiment.

Meanwhile, molten salt enters the distributor 8 from the molten salt main pipe 20, enters the vertical inlet 4 and each horizontal inlet 27 through the main pipe 9 and the branch pipes 10, enters the accommodating cavity 2 and is filled in the accommodating cavity 2, and the corrugated pipe 5 and the refractory bricks 3 are completely soaked in the molten salt.

The fused salt is contacted with the corrugated pipe 5 to absorb the heat of the heat supply working medium; fused salt and 3 contacts of nai firebrick, when the fused salt absorbs sufficient heat from the heat supply working medium, the fused salt conducts the heat conduction of heat supply working medium for 3 storage of nai firebrick, when the fused salt from the heat supply working medium absorb not enough heat and lead to its temperature to hang down when low, 3 reversedly conduct the heat for the fused salt of nai firebrick. And the heat supply working medium after heat exchange flows back to the heating device of the tower type photo-thermal power station again.

Molten salt exchanges heat with the corrugated pipe 5 and the refractory bricks 3, flows through the buffer cavity, flows to the power generation heat exchange pipeline 25 from the fluid outlet 6, and exchanges heat with a subsequent molten salt heat exchanger of the generator set.

In summary, the heat storage device 26 for the tower-type photothermal power station in the embodiment adopts a mode that the molten salt and the refractory bricks 3 store heat at the same time, and the molten salt is a heat exchange medium of the generator set, so that the continuity of operation is maintained, and the heat exchange-power generation system of the second-generation tower-type photothermal power station can be used, and the system transformation cost is reduced.

The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments. Even if various changes are made to the present invention, it is still within the scope of the present invention if they fall within the scope of the claims of the present invention and their equivalents.

Claims

1. A heat storage device for a tower-type photothermal power station, comprising:

the solid heat storage component is arranged in the accommodating cavity;

2. The heat storage device for the tower-type photothermal power station as claimed in claim 1, wherein said solid heat storage member comprises a plurality of solid heat storage layers, said heat supply member comprises a plurality of heat exchange tubes, and a plurality of said heat exchange tubes are provided between adjacent said solid heat storage layers.

3. The heat storage device for the tower-type photothermal power station according to claim 2, wherein a plurality of layers of the solid heat storage layers are vertically stacked.

4. The heat storage device for the tower-type photothermal power station of claim 3, wherein adjacent solid heat storage layers are in contact with each other and cooperate to form a plurality of accommodating channels, the heat exchange tube is inserted into the accommodating channels, a gap is provided between the heat exchange tube and the accommodating channels, the gap is filled with the heat exchange fluid, the solid heat storage layers are provided with vertical channels, and the heat exchange fluid enters the accommodating channels through the vertical channels.

5. The heat storage device for the tower-type photothermal power station according to claim 4, wherein each layer of the solid heat storage layer comprises a plurality of solid heat storage units, the solid heat storage units are provided with channels, and the channels of the solid heat storage units in adjacent layers cooperate to form the accommodating channel.

6. The heat storage device for a tower-type photothermal power station according to claim 2, wherein said fluid inlet is provided in plurality and is provided at the top and side of said main body, respectively.

7. The heat storage device for the tower-type photothermal power station as claimed in claim 6, wherein a vertical inlet is provided at the top of the main body, and a plurality of horizontal inlets are provided at the side of the main body.

8. The heat storage device for the tower-type photothermal power station of claim 7, wherein the horizontal inlet is disposed between the heat exchange tube and the solid heat storage layer and above the heat exchange tube.

9. The heat storage device for the tower-type photothermal power station as claimed in claim 2, wherein the heat exchange tube is a corrugated tube.

10. The heat storage device for the tower-type photothermal power station according to claim 9, wherein a plurality of spurs are provided on the outer wall of the node tube, and the spurs are provided at the joint of the node tube and the straight tube section.

11. The heat storage device for the tower-type photothermal power station according to claim 5, wherein said solid heat storage unit is a mixture of refractory bricks or solid iron-based material, and said solid heat storage unit is provided with a plurality of through holes to form said vertical channel.

12. The heat storage device for a tower-type photothermal power station according to claim 5, wherein a buffer material is provided between adjacent solid heat storage units.