CN207922928U - High temperature heat storage device based on thermal conductivity enhanced molten salt composite phase change material - Google Patents

Abstract

The utility model relates to the technical field of high-temperature heat utilization and energy storage, in particular to a high-temperature heat storage device based on a heat conduction enhanced fused salt composite phase change material; the device comprises a device body, a heat storage ball accumulation system and an input and output system, wherein the heat storage ball accumulation system is arranged in the device body; the heat storage ball accumulation system is composed of a plurality of heat storage ball combined units, the heat storage balls can be internally packaged with fused salt composite phase-change materials with different phase-change temperatures, and the heat storage balls are accumulated in the inner cavity of the tank body in a filling bed mode based on an inclined temperature layer single-tank heat storage design idea to form the heat storage ball combined units, so that the heat conduction performance of the material is enhanced; the heat storage system is formed by stacking in a packed bed mode, the industrial applicability is improved, and the heat storage system can be used for heat accumulators of industrial furnaces, iron-making hot blast stoves, heat storage subsystems of focusing solar thermal power generation and the like.

Description

High temperature heat storage device based on thermal conductivity enhanced molten salt composite phase change material

technical field

The invention relates to the technical field of high-temperature heat utilization and energy storage, in particular to a high-temperature heat storage device based on a heat conduction-enhanced molten salt composite phase-change material.

Background technique

As an important part of energy utilization, energy storage plays a particularly important role in industrial energy conservation and the utilization of renewable energy. Due to the intermittent and unstable supply of renewable energy, there are often differences in quantity, form and space between the supply and demand of energy, which cannot meet the requirements of industrialized large-scale continuous energy supply; industry is my country's largest The terminal energy consumption sector accounts for about 70% of the total energy consumption in the country, and the energy utilization rate is much lower than that of advanced countries. One of the main reasons is that the intermittent high-quality waste heat has not been effectively utilized, so it is necessary to develop high-efficiency storage heat technology.

The performance and cost of heat storage technology depend on the performance of the heat transfer and heat storage medium material and the design and control of the heat storage/discharge process. The main development idea is to develop high heat storage density, high use temperature, and high heat storage/discharge rate. , low-cost, environment-friendly heat storage media materials, develop process-controllable heat storage methods, and study the transmission and heat storage mechanisms of high-performance working fluids. Molten salt has a series of advantages such as large heat capacity, high operating temperature, low vapor pressure, low viscosity, good chemical stability, etc., and has both heat storage and heat transfer functions. development focus.

A single inorganic molten salt or a mixture of several molten salts has the disadvantages of low thermal conductivity and large volume change during phase transition, which affects its practical application. The compounding of materials is one of the inevitable trends in the development of materials. Composite phase change heat storage materials are beneficial to combine the advantages of sensible heat and latent heat heat storage materials, and provide a new idea for the micro-encapsulation anti-corrosion technology of medium and high temperature phase change materials. Structural support materials are conducive to the realization of the stereotyped structure of the composite body. At the same time, the micro-nano doping of the thermal conductivity-enhanced material is easy to realize the adjustable heat transfer process of the medium-high temperature heat storage material, and improve the heat storage/discharge rate of the heat storage material. The composite preparation of materials in a multi-scale range is conducive to balancing the relationship between the structural characteristics, thermal conductivity, and heat storage performance of composite structure heat storage materials, and the development of high-performance nano-micro composite structure heat storage materials is beneficial to the field of medium and high temperature heat storage. , especially in the fields of solar thermal power generation and industrial waste heat recovery.

Although, the patent number is 01119014.0, and the patent name is the preparation method of energy storage composite materials for heat storage or cold storage, which discloses a graphite matrix prepared by vacuum impregnation of compressed expanded graphite matrix with phase change material (PCM) and PCM impregnated in said matrix and method for thermal or cold storage energy storage composite materials, the method is mainly under atmospheric pressure and partially or completely impregnated in molten PCM or salt solution is fixed in the impregnated Inside the container, then evacuate and impregnate the container until the PCM filled in the matrix reaches the required amount. Although this method is simple and cheap, the residual porosity of graphite is too small, resulting in poor heat and cold storage.

At the same time, the patent application number 02133310.6 discloses a preparation method of a metal-based composite molten salt heat storage material. The method aims to provide a sensible heat heat storage material with a porosity of 25-85%. Judging from the existing documents, the technical solution is very incomplete, and we have not obtained any substantive technical inspiration from it, how to obtain a sensible heat storage material with a porosity of 25-85%.

In addition, the patent application number 200910074633.6 discloses a metal foam-based high-temperature phase change heat storage composite material and its preparation method. For thermal materials, first of all, "adhesion" is difficult to achieve, and at the same time, "adhesion" is difficult to guarantee. This method is difficult to apply to industrial production.

In addition, the patent application No. 201010527277.1 discloses a method for preparing a porous material matrix. The method mainly involves weighing and mixing calcium-containing raw materials and silicon-containing raw materials at a molar ratio of Ca: Si = 1: 0.4-1. Add water to 20-40 times the weight, stir and keep warm at 180-320°C for 4-12 hours to obtain a porous material slurry; after the slurry is cooled, add 0%-5% nano-metal powder, after drying and molding That is to make a porous material matrix, immerse the porous material matrix in the completely melted inorganic salt phase change material, so that the phase change material is infiltrated into the pores of the porous material matrix; this method is expensive and difficult to process, and the "immersion" method is adopted In fact, it is difficult to ensure whether the method is "uniformly soaked", and the quality is difficult to be guaranteed, which affects the heat transfer effect.

When using molten salt composite phase change materials for heat exchange and energy storage, using molten salt thermocline layer single tank device for heat storage is a liquid-solid combined sensible heat storage method, which organically combines the good heat transfer performance of liquid With the low-cost advantage of solid heat storage, using the relationship between density and temperature, a natural stratification with a large temperature gradient is formed in the middle of the tank, that is, the thermocline layer, which, like the isolation layer, makes the above thermocline layer melt The salt liquid keeps high temperature, and the molten salt liquid below the thermocline layer keeps low temperature. As the molten salt liquid is continuously pumped out, the thermocline layer will move up and down, and the extracted molten salt liquid can maintain a constant temperature. When the thermocline layer reaches the top or bottom of the tank , the temperature of the extracted molten salt solution will change significantly. In order to maintain the temperature gradient stratification in the tank, it is necessary to strictly control the injection and discharge process of the molten salt liquid, reasonably fill the solid heat storage medium in the tank and configure appropriate layering equipment, such as floating inlets and annular shell heat exchangers et al., the researchers found that the thermocline single-tank indirect heat storage system with suitable porous media fillers has great development advantages. In the field of heat storage technology, in addition to the use of natural solid heat storage media such as siliceous sand, quartz stone, and iron ore, synthetically prepared porous functional materials and packed beds can effectively improve heat storage/release efficiency and heat storage capacity. received extensive attention from researchers.

The research shows that the volumetric heat capacity ( ρc _p ) of the filler is an important factor affecting the effective volumetric heat storage capacity of the device and the thickness of the thermocline layer in the thermocline single-tank heat storage process. Utilizing the characteristics of molten salt composite phase change materials having large phase change latent heat in a small temperature range, that is, having a large equivalent sensible heat capacity, which is equivalent to converting the phase change latent heat into a large sensible heat Capacity ( c _p ), so as to make up for the shortage of traditional siliceous sand, quartz stone, iron ore and other solid heat storage media, and effectively improve the heat storage capacity.

Therefore, it has important application value to provide a heat conduction-enhanced molten salt composite phase change material and a matching high-temperature heat storage device and heat exchange and energy storage method.

Contents of the invention

The main purpose of the present invention is to overcome the shortcomings and deficiencies of the prior art, and to provide a technical solution based on molten salt composite phase change materials, using a high-temperature heat storage device for energy storage, especially a single tank for heat storage in a thermocline Based on the design concept, the heat conduction-enhanced molten salt composite phase change material combined with the phase change heat storage of the porous substrate/molten salt composite material, heat storage device and energy storage method.

In order to achieve the above object, the present invention provides the following technical solution: a high-temperature heat storage device based on a thermally enhanced molten salt composite phase change material, the device includes a device body, a heat storage ball stacking system, and an input and output system, wherein the heat storage The hot bulb stacking system is arranged inside the device body, and the input and output system includes an upper part and a lower part, the upper part is installed on the upper part of the device body, and the lower part is installed on the bottom of the device body; the device body is a tank body with openings at both ends Structure, the tank body includes the outer shell and the inner cavity, the upper port of the tank body is equipped with a flow equalizer plate under the upper part of the input and output system, and the lower port of the tank body is installed with a current equalization support frame above the lower part of the input and output system, and the current equalization support The frame includes a support seat and a support orifice plate, the support base is installed on the cover plate of the lower part of the input and output system, and the support orifice plate is installed on the support seat; the heat storage ball stacking system is composed of several heat storage ball combination units, the storage The thermal bulb combination unit is composed of multiple thermal storage bulbs encapsulated with molten salt composite phase change materials. The thermal storage bulbs can encapsulate molten salt composite phase change materials with different phase transition temperatures. The design concept is to pile up the heat storage ball combination unit in the tank cavity in the form of a packed bed, and the heat storage ball combination unit is separated by a flow sharing plate. The flow sharing plate is a metal plate with through holes evenly distributed and installed in an embedded form. In the inner cavity of the tank, ensure that the heat exchange medium can flow horizontally and evenly from the through hole from top to bottom or from bottom to top.

The upper part of the input and output system is provided with a pipeline structure, the bottom is provided with an end cover structure, and the upper port of the tank body is provided with an upper end cover structure, and the end cover of the input system is fixedly connected with the upper end cover of the tank body by bolts to exchange heat. The working fluid is input or output from the pipe mouth.

The lower part of the input and output system is provided with a pipeline structure, and the part connected with the tank body is provided with a cover plate structure, which matches with the bottom of the tank body, and the cover plate is sealed and fixedly connected with the bottom of the tank body by welding.

The external connection of the high-temperature heat storage device is equipped with a heating and heat preservation system, including a heat preservation device and a heating device.

The beneficial effects of the present invention are: firstly, the substrate used in the composite phase change material of the present invention is expanded graphite, and the expanded graphite is prepared by controlling the frequency of microwaves in microwave expansion and the frequency of microwave heating to obtain high-performance and high-aperture expanded graphite. Using Hitec ternary nitric acid molten salt as the phase change material, the KNO ₃ -NaNO ₂ -NaNO ₃ /expanded graphite composite phase change material was obtained by controlling the mixed preparation process parameters of the substrate and the phase change material, which enhanced the thermal conductivity of the material; at the same time The KNO ₃ -NaNO ₂ -NaNO ₃ /expanded graphite composite phase change material is encapsulated with a stainless steel spherical shell material. Due to the adsorption characteristics and shaping effect of the expanded graphite on the molten salt, it overcomes the volume of the molten salt during the storage/discharge process. For defects with large changes, the package shell can be completely filled with composite phase change heat storage materials to avoid the reduction of heat transfer efficiency due to the existence of gaps, thereby preparing molten salt heat storage balls with high thermal conductivity; and then through reasonable design of high temperature heat storage devices As well as the heating and insulation system installed externally, it is piled up in the form of a packed bed to form a heat storage system. During operation, the latent heat of the molten salt composite phase change material and the sensible heat of the fluid are used to store heat. The energy storage method, this latent/sensible heat composite The system not only maintains the advantages of high latent heat storage density and stable energy output, and the sensible heat storage medium can be in direct contact with the heat exchange fluid for heat exchange, but also overcomes the latent heat storage system that requires a large amount of metal containers, pipes, and the presence of molten salt corrosion. Disadvantages, improve industrial applicability, can be used for heat accumulators of industrial furnaces, hot blast stoves for ironmaking, and heat storage subsystems for concentrated solar thermal power generation.

Description of drawings

Fig. 1 is a schematic cross-sectional structure diagram of a heat storage ball in the present invention.

Fig. 2 is a schematic diagram of an exploded structure of a high-temperature heat storage device in the present invention.

Fig. 3 is a schematic diagram of the assembly structure of the high-temperature heat storage device in the present invention.

Fig. 4 is a schematic diagram of the principle of the heat storage process in the present invention.

Fig. 5 is a schematic diagram of the principle of exothermic process in the present invention.

Description of drawings: 1-device body, 11-outer shell, 12-inner cavity, 13-upper end cover, 2-heat storage ball stacking system, 21-heat storage ball, 211-composite phase change material, 212 stainless steel shell, 3 - input and output system, 31 - upper part, 32 - lower part, 311 - end cover, 321 - cover plate, 33 - pipe, 4 - equalizer plate, 5 - support seat, 6 - support orifice plate.

Detailed ways

The specific embodiment of the present invention is described in detail below in conjunction with accompanying drawing 1-5 of specification sheet:

As shown in Figure 1, a thermal conductivity-enhanced molten salt composite phase change material, the raw materials of the molten salt composite phase change material include a substrate and a phase change material, the substrate adopts a porous expansion material, such as foam ceramics or metal foam Or expanded graphite, etc. In view of the defect of low thermal conductivity of molten salt, expanded graphite is selected as the porous substrate, and one or more mixtures of nitrate, chloride or carbonate are selected as the molten salt of the phase change material. After a large number of experiments, Hitec Ternary nitric acid molten salt has excellent physical and chemical properties, so Hitec ternary nitric acid molten salt is selected as the phase change material, and then the prepared substrate and phase change material are prepared by saturated aqueous solution method to prepare expanded graphite/ternary nitric acid molten salt Composite phase change heat storage material.

The base material is expanded graphite. After drying the expandable flake graphite, the microwave penetrating into the graphite interacts with the polar molecules between the graphite layers and converts it into heat energy, so that each part of the graphite can be obtained at the same moment. The microwave frequency ranges from 200 to 250 GHz, and the microwave heating frequency is 2450 MHz. The expandable graphite decomposes or vaporizes rapidly at high temperature so that the graphite is peeled off along the C-axis to obtain expanded graphite; this preparation method undergoes a large number of experiments. The relationship between the experimental parameters and the performance of expanded graphite was obtained, and expanded graphite with high performance and high porosity was obtained by controlling the microwave frequency range and microwave heating frequency. Described phase-change material is molten salt, can select nitrate to mix potassium nitrate, sodium nitrite, sodium nitrate with the mass ratio of 53:40:7 and prepare Hitec ternary nitric acid molten salt; The ternary mixed nitrate is poured into a container, fully stirred and mixed evenly, and an appropriate amount of deionized water is added until a saturated nitrate solution is prepared.

Prepare expanded graphite/ternary nitric acid molten salt composite phase change heat storage material by saturated aqueous solution method: add the prepared saturated nitrate solution into the beaker, then add the prepared expanded graphite and stir well, the amount of expanded graphite added is 20 %, so that the loose and porous expanded graphite is completely submerged in the saturated nitrate solution; then put the beaker in a water bath at 90 ℃ and heat it in a water bath, and use an electric stirrer to keep stirring during the heating until most of the water in the saturated nitrate Evaporate to dryness, then put the beaker in a constant temperature electric heating mantle at 120 ℃ to completely evaporate the remaining water, and then put it into an electric heating constant temperature blast drying oven for drying; grind the block sample obtained from the drying treatment into small particles, that is, KNO ₃ -NaNO ₂ -NaNO ₃ /expanded graphite composite phase change material 211 is obtained, and finally encapsulated with a stainless steel shell 212 with high thermal conductivity and strength to make a molten salt heat storage ball 21 with high thermal conductivity. The adsorption characteristics and shaping effect of salt overcome the defect that the volume of molten salt changes greatly during the heat storage/release process, and can completely fill the composite phase change heat storage material in the packaged stainless steel shell 212, avoiding the reduction of heat transfer due to the existence of gaps efficiency, thereby preparing molten salt heat storage balls 21 with high thermal conductivity. During the preparation process, composite phase change materials 211 with different thermal conductivity and heat storage density can be prepared by adjusting the addition amount of expanded graphite; in the experiment of the present invention, the thermal conductivity of ternary mixed nitric acid molten salt is 0.824 W m ^-1 ·K ^-1 , when expanded graphite is added, the thermal conductivity of the composite phase change material 211 is effectively improved, and the thermal conductivity of the sample with 20% expanded graphite is 5.49 W·m ^-1 ·K ^-1 , which is increased by 6.66 times , and exhibited good thermal stability in thermal cycling tests.

As shown in Figure 2-3, a high-temperature heat storage device based on thermally enhanced molten salt composite phase change materials, the device includes a device body 1, a heat storage ball stacking system 2, and an input and output system 3, wherein the heat storage The ball stacking system 2 is arranged inside the device body 1, the input and output system 3 includes an upper part 31 and a lower part 32, the upper part 31 is installed on the top of the device body 1, and the lower part 32 is installed on the bottom of the device body 1; the device The main body 1 is a tank structure with openings at both ends. The tank body includes an outer shell 11 and an inner cavity 12. The outer shell 11 is a cylindrical or cuboid structure. The upper and lower ends of the outer shell 11 are connected to the input and output system 3 through pipes 33 respectively. A flow equalizing plate 4 is installed below the upper part 31 of the input and output system 3, and a current equalizing support frame is installed above the lower part 32 of the input and output system 3 at the lower port of the tank body. The current equalizing support frame includes a support seat 5 and a supporting orifice plate 6. The support base is installed on the cover plate 321 of the lower part 32 of the input and output system 3, and the support orifice plate 6 is installed on the support seat 5; both the flow equalizer 4 and the support orifice plate 6 are metal plates uniformly processed with through holes, It is installed in the inner cavity 12 of the tank in an embedded form to ensure that the heat exchange medium can flow horizontally and evenly from the through hole from top to bottom or from bottom to top; the heat storage ball stacking system 2 consists of several heat storage balls 21 The combination unit is composed of heat storage balls 21. The combination unit is composed of a plurality of heat storage balls 21 packaged with molten salt composite phase change materials 211. Inside the heat storage balls 21, molten salt composite phase change materials 211 with different phase transition temperatures can be packaged, according to The composite phase change material 211 encapsulated by the heat storage ball 21 has a stepwise distribution of melting points. The heat storage ball 21 is based on the heat storage design concept of a single tank with a thermocline layer and is piled up in the inner cavity 12 of the tank in the form of a packed bed to form a combination unit of the heat storage ball 21. The combined units of the balls 21 are separated by the flow equalizer 4, the flow equalizer 4 forms a horizontal and uniform flow channel for the heat exchange working medium, and plays a certain structural support role to prevent mutual extrusion and deformation of the heat storage balls 21; input The upper part 31 of the output system 3 is provided with a pipe 33 structure, the bottom is provided with an end cover 311 structure, and the upper port of the tank body is provided with an upper end cover 13 structure, and the end cover 311 of the input system is fixed to the upper end cover 13 of the tank body by bolts Connection, in order to improve installation and sealing, a gasket is placed between the end cover 311 of the input system and the upper end cover 13 of the tank body, and the heat exchange medium is input or output from the pipe 33; the lower part 32 of the input and output system 3 The pipe 33 structure is provided, and the part connected with the tank body is provided with a cover plate 321 structure, which matches the bottom of the tank body. Input or output; the external connection of the high-temperature heat storage device is equipped with a heating and heat preservation system, including a heat preservation device and a heating device, and the heat preservation device wraps the entire high-temperature heat storage device inside to reduce heat loss and achieve heat preservation; The function is to heat the heat exchange working medium in the input and output system 3 pipeline 33. Since the freezing point of Hitec nitric acid molten salt is 143°C, the molten salt fluid Solidification occurs when the temperature is lower than the freezing point, and it is necessary to take necessary preheating and heat tracing measures for the input and output system 3 pipeline 33, heat storage device body 1 and accessories to avoid solidification blockage.

As shown in Figure 4-5, an energy storage method based on a heat conduction-enhanced molten salt composite phase change material comprises the following steps:

(1) Heat storage stage: At the beginning of the heat storage process, there is a low-temperature fluid in the inner cavity 12 of the heat storage device body 1 and it is accumulated in the inner cavity 12 of the tank in the form of a packed bed based on the design concept of thermocline single-tank heat storage. The heat storage ball 21 combined unit is formed. The heat storage ball 21 does not completely fill the inner cavity 12. The inside of the heat storage ball 21 can encapsulate heat conduction-enhanced molten salt composite phase change materials 211 with different phase transition temperatures. The heat storage ball 21 combination The units in the device body 1 can be distributed in steps according to the melting point of the internal composite phase change material 211. The high-temperature heat-exchange working fluid from the external equipment is input from the input system. The heat-exchanging medium can be selected from heat transfer oil, Molten salt liquid, etc. The molten salt heat transfer fluid can be selected from nitrate, chloride, carbonate system, etc. according to the operating temperature range. In this experiment, Hitec nitric acid molten salt fluid is used as the heat transfer medium. The system enters, flows through the equalizer plate 4, flows horizontally and evenly from top to bottom, and injects into the inner cavity 12 of the tank. The heat is stored in the heat storage ball 21, and the original low-temperature fluid in the tank cavity 12 flows out partly or completely from the equalizing plate 4 at the bottom in the form of thermocline layer storage/discharge according to the difference in heat storage; then enters the lower One heat storage ball 21 combination unit performs heat exchange until the heat storage ball 21 combination unit flowing through the bottom completes the heat exchange. Correspondingly, after the heat storage process is completed, all or part of the heat exchange working medium remains in the tank. Store some heat in the form of sensible heat. The low-temperature fluid and heat-exchanging working fluid flowing out of the replacement flow out from the input and output system 3 pipe 33, and after being heated by an external heat collection device or heating device, the above cycle continues until the end of the heat storage process; more specifically, in the heat storage process At the beginning, there is a low-temperature Hitec nitrate molten salt fluid with a temperature of T ₀ in the heat storage device and a stacked bed of heat storage balls 21. At the initial time τ = 0, the temperature from the external equipment is T _in ( T _in > T ₀ ) , The high-temperature heat-exchange working fluid (Hitec molten salt of nitric acid) with a speed of u _in is input from the input system at the upper end of the tank body, passes through the equalizer plate 4 to exchange heat with the accumulation bed of the heat storage ball 21, and stores the heat in the heat storage ball 21, the original low-temperature fluid in the tank flows out from the bottom part or all in the form of thermocline layer heat storage/release according to the difference in heat storage; Part remains in the tank, storing part of the heat as sensible heat. The low-temperature fluid and heat-exchange working medium flowing out from the displacement are heated by the external heat-collecting equipment or heating device, and then continue to execute the above-mentioned cycle until the end of the heat-storage process.

(2) Heat release stage: At the beginning of the heat release stage, there is a relatively high temperature fluid in the inner cavity 12 of the heat storage device body 1 and it is accumulated in the inner cavity 12 of the tank in the form of a packed bed based on the design concept of thermocline single tank heat storage. The heat storage ball 21 combination unit is formed, the low-temperature heat exchange working medium from the external equipment is input from the input system, flows through the support orifice 6, flows horizontally and evenly from bottom to top, and is injected into the inner cavity 12 of the tank, and the heat exchange working medium Exchange heat with the heat storage ball 21 combined unit of the heat storage ball 21 stacked bed type, the heat stored inside the heat storage ball 21 is released to the heat exchange working medium, and the original high-temperature fluid in the tank changes according to the heat release in the thermocline layer Heat storage/radiation way, part or all flow out from the upper end; then enter the next heat storage ball 21 combination unit for heat exchange, until the heat exchange through the topmost heat storage ball 21 combination unit is completed, correspondingly, complete the discharge After the thermal process, all or part of the heat exchange working medium remains in the tank; after the high-temperature fluid and heat exchange working medium flowing out of the replacement pass through the external heat equipment for heat release, the above cycle continues until the end of the heat release process; more specifically What is more important is that when the exothermic phase begins, there is a high-temperature Hitec nitrate molten salt fluid and heat storage ball 21 piled up bed with a temperature of T ₀ in the tank, and at the initial time τ = 0, the temperature is T _in ( T _in < T ₀ ), the low-temperature heat-exchange working medium (Hitec molten salt of nitric acid) with a speed of u _in is evenly input from the bottom of the tank, and performs heat exchange with the accumulation bed of the heat storage ball 21, and the heat stored in the heat storage ball 21 is released to the heat exchange worker According to the heat release, the original high-temperature fluid in the tank partially or completely flows out from the upper end in the form of thermocline storage/release; correspondingly, all or part of the heat transfer fluid after completing the heat release In the tank, the high-temperature fluid and heat-exchanging working medium flowing out from the displacement process continue to perform the above cycle after passing through the external heat-using equipment to release heat until the end of the heat release process.

The invention can be applied to high-temperature heat utilization occasions, such as a concentrated solar thermal power generation system using molten salt as a heat transfer and heat storage medium, replacing the traditional molten salt double-tank heat storage method.

The above are only preferred embodiments of the present invention, and are not intended to limit the technical scope of the present invention. Those skilled in the art can make some deformations and modifications under the inspiration of this technical solution. Any modifications, equivalent changes and modifications made to the above embodiments by technical essence still belong to the scope of the technical solution of the present invention.

Claims (4)

1. a kind of high-temperature heat storage device based on enhanced thermal conduction type fuse salt composite phase-change material, which is characterized in that the dress It sets including device body, heat-storing sphere accumulation system, input-output system, wherein heat-storing sphere accumulation system is arranged in device body Portion, input-output system include upper and bottom section, are above partially installed on the top of device body, and lower part is mounted on device The bottom of ontology；The device body is the tank structure of both ends open, and tank body includes shell and inner cavity, and tank body upper port exists Homogenizing plate is installed, tank body lower port is installed in the top of input-output system lower part on input-output system below part Have and flow supporting rack, it includes support base and support orifice plate to flow supporting rack, and support base is mounted on input-output system lower part Cover board on, support orifice plate be mounted on support base on；The heat-storing sphere accumulation system is made of several heat-storing sphere assembled units, Heat-storing sphere assembled unit is made of multiple heat-storing spheres for being packaged with fuse salt composite phase-change material, and difference can be encapsulated inside heat-storing sphere The fuse salt composite phase-change material of phase transition temperature, heat-storing sphere are accumulated based on mesolimnion list tank accumulation of heat design concept in the form of packed bed Heat-storing sphere assembled unit is constituted in tank inner chamber, is separated by homogenizing plate between heat-storing sphere assembled unit, homogenizing plate is uniformly to open Metallic plate equipped with through-hole is mounted on tank inner chamber in the form of embedded, ensure heat-exchange working medium can it is horizontal, equably from through-hole from On flow down or from bottom to top.

2. a kind of high-temperature heat storage device based on enhanced thermal conduction type fuse salt composite phase-change material according to claim 1, It is characterized in that：The top of the input-output system, which is set up separately, is equipped with pipeline configuration, and bottom is arranged to end cover structure, tank body it is upper Portion port is provided with upper end cover structure, is fixedly connected with the end cap of input system with the upper end cover of tank body by bolt, and exchange heat work Matter is inputted or is exported from pipeline opening.

3. a kind of high-temperature heat storage device based on enhanced thermal conduction type fuse salt composite phase-change material according to claim 1, It is characterized in that：The lower part of the input-output system is provided with pipeline configuration, and the part being connect with tank body is arranged to cover Harden structure matches with tank base, and cover board and tank base are sealedly and fixedly connected by the way of welding.

4. a kind of high-temperature heat storage device based on enhanced thermal conduction type fuse salt composite phase-change material according to claim 1, It is characterized in that：The high-temperature heat storage device external connection is equipped with heat insulation system, including attemperator and heating fill It sets.