CN202734303U - High-temperature heat storage and exchange device applied to solar heat power generation - Google Patents

Abstract

A high-temperature heat storage and heat exchange device applied to solar thermal power generation, which includes an air intake pipe (1), an air intake distribution pipe (2), a heat storage chamber box (5), a heat storage chamber door (6), an air outlet Piping (3), outlet pipe (4), high temperature phase change heat storage pipe (7), high temperature phase change heat storage pipe support (8), insulation material, phase change heat storage material (9); heat storage chamber box (5) There are insulation materials inside and outside; one end of the heat storage room door (6) is hinged with the outer wall of the heat storage room box (5). When the heat storage room door (6) is closed, the heat storage room door (6) and the heat storage room box The body forms a sealed heat storage space; one end of the heat storage chamber (5) is provided with an air intake pipe (1), the air intake distribution pipe (2), and the other end of the heat storage chamber (5) is provided with an air outlet Piping (3), outlet pipe (4); high-temperature phase-change heat storage tube (7) is supported by high-temperature phase-change heat storage tube (8) and fixed, and high-temperature phase-change heat storage tube (7) is encapsulated with phase-change heat storage material (9) . It has the characteristics of simple structure, high heat exchange efficiency, safety and reliability.

Description

A high-temperature heat storage and heat exchange device applied to solar thermal power generation

technical field

The utility model relates to an energy storage and release device, in particular to a high-temperature heat storage and heat exchange device applied to solar thermal power generation. the

Background technique

Solar energy is a clean, efficient and inexhaustible new energy source. It is non-polluting and easy to use. However, the solar radiation reaching the earth's surface has a very low energy density and is subject to regular changes in geography, day and night, and seasons. , and due to the constraints of random factors such as sunny clouds and rain, its radiation intensity is also constantly changing, with significant thinness, discontinuity and instability. In the solar thermal power generation system, the solar collector sends the collected solar radiation energy to the receiver to generate hot air or hot steam, and the traditional power cycle is used to generate electricity. In order to maintain the stable and uninterrupted operation of the power supply device, it is necessary The heat storage device stores the solar energy and releases it when the solar energy is insufficient, so as to meet the needs of continuous and stable supply of production and living energy. Therefore, the solar high-temperature heat storage device is the key technology of solar thermal power generation. It is very important for improving the power generation efficiency of the system , Improving the stability and reliability of system power generation is of great significance. the

The high-temperature heat storage system used for solar thermal power generation should have good heat preservation effect, oxidation resistance at high temperature, can realize heat storage and heat release cycle, simple operation, safety and reliability, and low cost. High-temperature heat storage materials should meet high heat storage density, fully reversible heat storage and heat release cycles, good thermal conductivity, no high-temperature corrosion, excellent chemical stability, and safety and reliability. The heat storage materials currently used in solar thermal power generation include water, heat transfer oil, high temperature resistant concrete and molten salt. The energy storage density of water as a heat storage material is not high, and the vapor pressure of water and heat transfer oil is very high at high temperature, and special pressure valves and other equipment are required when using it. Heat transfer oil is also easy to cause fire and is more expensive; Thermal materials have high requirements for internal heat exchange pipes, and their cost accounts for 45%-55% of the cost of the entire heat storage system; molten salt generally has defects such as low thermal conductivity, low energy storage density, and low operating temperature, which lead to The energy system is relatively large and the steam parameters of solar thermal power generation are relatively low. Compared with the above-mentioned heat storage materials, aluminum-based alloy heat storage materials have the advantages of high heat storage density, good thermal cycle stability, high thermal conductivity, good cost performance, non-flammable, non-toxic, etc. ℃) has a great advantage in the application, but the aluminum-based alloy heat storage material is strongly corrosive in the liquid state, and during the long-term heat absorption and release cycle, the heat storage material and the heat storage container material may occur A variety of electrochemical reactions and physical reactions can obviously corrode the material of the heat storage container, or change the thermophysical properties of the heat storage material. In addition, phase change materials are often accompanied by volume changes during the phase change process, so it is very important to choose the material of the heat storage container properly. Therefore, for aluminum-based alloy heat storage materials, selecting corresponding heat storage container materials and designing corresponding heat storage devices can be used in solar thermal power generation systems, so research on aluminum-based alloy heat storage devices needs to be further developed. the

Contents of the invention

The purpose of the utility model is to provide a high-temperature heat storage and heat exchange device applied to solar thermal power generation, which has the characteristics of simple structure, high heat exchange efficiency, safety and reliability. the

In order to achieve the above purpose, the technical solution of the present utility model is: a high-temperature heat storage and heat exchange device applied to solar thermal power generation, which is characterized in that it includes an air intake pipe 1, an air intake distribution pipe 2, a heat storage chamber box 5, Heat storage chamber door 6, air outlet distribution pipe 3, air outlet pipe 4, high temperature phase change heat storage pipe 7, high temperature phase change heat storage pipe support 8, insulation material, phase change heat storage material 9; Material; one end of the heat storage chamber door 6 is hinged with the outer wall of the heat storage chamber body 5. When the heat storage chamber door 6 is closed, the heat storage chamber door 6 and the heat storage chamber body form a sealed heat storage space; the heat storage chamber One end of the box body 5 is provided with an air intake pipe 1 , an air intake distribution pipe 2 , and the other end of the heat storage chamber box body 5 is provided with an air outlet distribution pipe 3 and an air outlet pipe 4 . The high-temperature phase-change heat storage tube 7 is fixed by the support 8 of the high-temperature phase-change heat storage tube, and the high-temperature phase-change heat storage tube 7 is encapsulated with a phase-change heat storage material 9 . the

The material of the high-temperature phase change heat storage pipe 7 is a ceramic steel composite pipe, the outer layer of the ceramic steel composite pipe is a seamless steel pipe 10, the inner layer is a corundum porcelain 11, and the lower end cover 12 and the upper end cover 13 are lined with corundum porcelain carbon steel plate, a plurality of high-temperature phase-change heat storage tubes 7 of the same specification are vertically placed and evenly distributed in a square or equilateral triangle, and the high-temperature phase-change heat storage tubes 7 are filled with phase-change heat storage materials 9, and the phase-change heat storage tubes 7 are filled with phase-change heat storage materials 9, and The variable heat storage material 9 is an aluminum-based alloy heat storage material. the

The beneficial effects of the utility model are: adopting the above-mentioned structure, the structure is simple and easy to implement, and even when the heat transfer medium is a high-temperature and high-pressure fluid, the safety and reliability of the heat storage system can still be ensured; the phase change material adopts an aluminum-based alloy heat storage material , the aluminum-based alloy heat storage material has a suitable phase change temperature and high heat storage density, which speeds up the heat exchange between the fluid and the phase change heat storage material, reduces the volume of the heat storage capacity device, and thus improves the storage capacity of the system. Thermal efficiency and heat storage density prolong the service life of the heat storage system and make the heat storage and release process stable and efficient. the

The material of the high-temperature phase-change heat storage pipe 7 of the present utility model is a ceramic steel composite pipe, the outer layer of the ceramic steel composite pipe is a seamless steel pipe 10, the inner layer is a corundum porcelain 11, and the lower end cover 12 and the upper end cover 13 are carbon lining corundum porcelain. The steel plate can give full play to the characteristics of high strength, good toughness, impact resistance, good welding performance of seamless steel pipe and high strength, corrosion resistance, high wear resistance and good heat resistance of corundum porcelain, and overcomes the low hardness and high resistance of seamless steel pipe. Due to the characteristics of poor abrasiveness and poor toughness of ceramics, ceramic steel composite pipes have good comprehensive properties such as corrosion resistance, wear resistance, heat resistance, mechanical shock and thermal shock performance, and good weldability, and are especially suitable for filling aluminum-based high-temperature pipes. Phase-change heat storage material, a plurality of high-temperature phase-change heat storage tubes 7 of the same specification are vertically placed and evenly distributed in a square or equilateral triangle, which can strengthen the degree of turbulence with hot air or hot steam fluid, and improve the degree of flow with hot air or hot steam. Fluid heat exchange efficiency, thereby improving the efficiency of the entire solar thermal power generation system. the

It is mainly used in solar thermal power generation systems with an operating temperature range of 400-700°C. the

Description of drawings

Fig. 1 is a perspective view of the utility model;

Fig. 2 is the front view of the utility model;

Fig. 3 is a sectional view along line A-A of Fig. 2;

Fig. 4 is a sectional view along the B-B line and the C-C line of Fig. 2;

Figure 5 is a schematic diagram of the structure of a high temperature phase change heat storage tube;

Figure 6 is a schematic diagram of the support structure of the high temperature phase change heat storage tube.

In the figure: 1. Intake pipe, 2. Intake distribution pipe, 3. Outlet distribution pipe, 4. Outlet pipe, 5. Heat storage chamber box, 6. Heat storage chamber door, 7. High temperature phase change heat storage pipe, 8 .High temperature phase change heat storage tube support, 9. Phase change heat storage material, 10. Seamless steel pipe, 11. Corundum porcelain, 12. Lower end cover, 13. Upper end cover. the

Detailed ways

Below in conjunction with accompanying drawing and specific embodiment the utility model is described in further detail. the

As shown in Fig. 1, Fig. 2, Fig. 3, Fig. 4, Fig. 5, and Fig. 6, a high-temperature heat storage and heat exchange device applied to solar thermal power generation includes an air intake pipe 1, an air intake distribution pipe 2, and an air outlet pipe. Piping 3, air outlet pipe 4, heat storage chamber box 5, heat storage chamber door 6, high temperature phase change heat storage pipe 7, high temperature phase change heat storage pipe support 8, insulation material, phase change heat storage material 9;

The heat storage chamber body 5 is a cube, and the wall surface of the heat storage chamber is made of high-temperature-resistant steel plate. In order to reduce heat loss, the inner and outer walls of the heat storage chamber are provided with insulation materials; one end of the heat storage chamber door 6 is connected to the heat storage chamber body 5 The outer wall of the heat storage chamber is hinged, and when the heat storage chamber door 6 is closed, the heat storage chamber door 6 and the heat storage chamber body form a sealed heat storage space; one end of the heat storage chamber body 5 is provided with an air intake pipe 1 and an air intake distribution pipe 2 , the other end of the heat storage chamber body 5 is provided with an air outlet distribution pipe 3 and an air outlet pipe 4;

The high-temperature phase-change heat storage tube 7 is arranged in the heat storage chamber. A plurality of high-temperature phase-change heat storage tubes 7 of the same specification are arranged vertically and evenly distributed in a square or equilateral triangle. The high-temperature phase-change heat storage tube 7 is packaged with a heat storage material , the high-temperature phase-change heat storage tube 7 is fixed by the high-temperature phase-change heat storage tube support 8, and the material of the high-temperature phase-change heat storage tube support 8 is a metal wire;

The material of the high-temperature phase-change heat storage pipe 7 is a ceramic-steel composite pipe, the outer layer of the ceramic-steel composite pipe is a seamless steel pipe 10, the inner layer is a corundum porcelain 11, and the lower end cover 12 and upper end cover 13 are carbon steel plates lined with corundum porcelain. The unique organizational structure of the tube can withstand the corrosion of aluminum-based heat storage materials. the

The insulation material can be made of aluminum silicate refractory fiber or a combination of aluminum silicate refractory fiber and slag wool board. The thickness of the insulation layer depends on the requirements of the heat storage temperature for heat loss. the

The phase change heat storage material 9 is an aluminum-based alloy heat storage material. The heat storage material can control the melting temperature between 450-570°C through different proportions, and can be selected according to needs. the

When the high-temperature heat storage and heat exchange device is storing heat, the high-temperature gas heated by the solar collector passes through the intake pipe and the intake distribution pipe so that the fluid is evenly introduced into the heat storage space, and the hot fluid transfers heat to the high-temperature phase-change heat storage tube. Phase-change heat storage materials, phase-change heat storage materials gradually change from solid to liquid. Because aluminum-based alloy heat storage materials have a large energy storage density, a large amount of heat energy can be stored in the entire device, and the thermal conductivity of the metal is large. It has a faster heat transfer efficiency during the solidification process, so that the heat energy is continuously converted into latent heat and stored in the phase change material. The fluid that released the heat flows out through the gas outlet distribution pipe and the gas outlet. After a certain period of time, the solid phase change storage The complete conversion of the thermal material to the liquid state maximizes heat storage, stopping the ingress and egress of thermal fluid. When the solar energy is weakened or heat energy needs to be utilized, the cold fluid flows along the same route as the hot fluid. At this time, the cold fluid passes through the tank of the phase-change heat storage and heat exchange device, and the phase-change heat storage material gradually changes from liquid to solid state and is released. The stored heat gradually heats the cold fluid. When the heat storage material releases part of the heat, the liquid on the inner wall of the heat exchange tube gradually solidifies. With the increase of the heat release, the phase change heat storage material gradually changes from liquid to solid state. After being in a solid state, no heat will be released. At this time, the temperature of the cold fluid rises to the highest value, and the heat storage and heat release process can be recycled and reused to realize efficient heat exchange between cold and hot fluids and solid-liquid phase change heat storage materials. . the

The manufacturing process of high-temperature phase-change heat storage tubes is relatively complicated, and its manufacturing method is as follows:

(1) Design high-temperature phase change heat storage tubes of appropriate size according to needs;

(2) The material of the high-temperature phase-change heat storage tube is ceramic steel composite tube, the outer layer is seamless steel pipe, the inner layer is corundum porcelain, and the upper and lower end covers use the principle of ceramic-metal composite manufacturing technology, that is, glue is used as the binder , by bonding the wear-resistant ceramic sheet on the surface of the carbon steel plate to form a surface with excellent wear resistance;

(3) As shown in Figure 5, process the heat storage tube body, upper end cover, and lower end cover according to the parts diagram for later use;

(4) First weld the heat storage tube body and the lower end cover together;

(5) Pour the powdery phase-change heat storage material into the heat storage tube, considering the volume expansion, it cannot be completely filled;

(6) Weld the upper end cover and the heat storage tube body together, and seal the high temperature phase change heat storage tube for later use.

Claims (3)

1. A high-temperature heat storage and heat exchange device applied to solar thermal power generation, characterized in that it includes an air intake pipe (1), an air intake distribution pipe (2), a heat storage chamber body (5), and a heat storage chamber door ( 6), outlet distribution pipe (3), outlet pipe (4), high temperature phase change heat storage pipe (7), high temperature phase change heat storage pipe support (8), insulation material, phase change heat storage material (9); heat storage chamber There are insulation materials inside and outside the box body (5); one end of the heat storage room door (6) is hinged with the outer wall of the heat storage room box (5), and when the heat storage room door (6) is closed, the heat storage room door (6) It forms a sealed heat storage space with the heat storage chamber; one end of the heat storage chamber (5) is provided with an air intake pipe (1), an air intake distribution pipe (2), and the other end of the heat storage chamber (5) One end is provided with an air outlet distribution pipe (3) and an air outlet pipe (4); the high temperature phase change heat storage pipe (7) is supported by the high temperature phase change heat storage pipe (8) and fixed, and the high temperature phase change heat storage pipe (7) is encapsulated with a phase change heat storage pipe Thermal Materials (9). 2. A high-temperature heat storage and heat exchange device applied to solar thermal power generation according to claim 1, characterized in that, the material of the high-temperature phase-change heat storage tube (7) is a ceramic steel composite tube, and the ceramic The outer layer of the steel composite pipe is seamless steel pipe (10), the inner layer is corundum porcelain (11), the lower end cover (12) and the upper end cover (13) are carbon steel plates lined with corundum The variable heat storage pipes (7) are placed vertically and distributed in a square or equilateral triangle. 3. A high-temperature heat storage heat exchange device applied to solar thermal power generation according to claims 1 and 2, the high-temperature phase change heat storage tube (7) is filled with a phase change heat storage material (9), and the phase change heat storage tube (7) is filled with a phase change heat storage material (9). The heat storage material (9) is an aluminum-based alloy heat storage material.

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