A heat storage and heat storage separation type solid electric heat storage device

Abstract

The present invention belongs to the field of clean energy technology, specifically a heat storage and separation type solid electric heat storage device, including a bottom foundation, an insulation material layer, a heat exchange device, a heat circulation fan, an energy storage body, a support brick body A and several groups of direct heating components, each group of direct heating components includes a support brick body B and a heating unit group. The air is input into the low-temperature air chamber through the heat circulation fan, first passes through the support brick body A, the heating unit and the support brick body B to the high-temperature air chamber B, then passes through the energy storage body to enter the high-temperature air chamber A, and then is discharged from the air inlet end of the heat exchange device. The air that has undergone heat exchange in the heat exchange device returns to the low-temperature air chamber, thereby performing a circulation heat exchange. Compared with the traditional single-energy storage body electric heat storage device, the present invention sets a direct heating component separately from the energy storage body, so that the energy storage body has better heat dissipation and more uniform air mixing. It can perform heat exchange with the air for a long time. While the heat output is stable, its life is also extended and the cost of use is also lower.

Description

Technical Field

[0001] The present invention belongs to the technical field of clean energy, and in particular relates to a heat storage and separation type solid electric heat storage device. Background Art

[0002] Currently, almost all manufacturers of solid-state electric thermal storage devices place their heating units inside the energy storage body, with a reserved heating unit installation channel inside the energy storage body. This channel serves both as a heating unit installation channel and as a space for hot and cold air exchange. Because the heating unit is in direct contact with the energy storage body, certain special circumstances (such as temperature sensor failure or uneven local ventilation) can lead to poor heat dissipation from the energy storage body, which can lead to overheating and damage to the heating unit, posing a hidden danger to the safe operation of the device. The device incurs high costs and significant losses during maintenance and shutdown periods. Most manufacturers, fearing damage to the heating unit components, can only lower the heat storage temperature of the energy storage body, making it difficult to reach above 650°C. Since the energy storage body cannot reach an operating temperature of 800°C-850°C, there is a significant waste of energy storage material and poor economic efficiency. Therefore, attention should be paid to this issue and solutions should be sought to improve the overall quality and performance of the product. Summary of the Invention

[0003] In view of the above problems, the object of the present invention is to provide a solid electric thermal storage device with heat addition and storage separation.

[0004] The object of the present invention is achieved through the following technical solutions:

[0005] A heat storage and separation solid electric heat storage device, comprising a bottom foundation, a heat insulation material layer, a heat exchange device, a heat circulation fan, an energy storage body, a supporting brick body A and several groups of direct heating components;

[0006] The heat-insulating material layer is arranged on the bottom foundation, and a heating cavity is formed inside the integral body formed by the heat-insulating material layer and the bottom foundation. One end of the bottom of the integral body formed by the heat-insulating material layer and the bottom foundation is provided with one end of a low-temperature air duct, and the other end of the bottom of the integral body formed by the heat-insulating material layer and the bottom foundation is provided with one end of a high-temperature air duct. The energy storage body and the supporting brick body A are respectively arranged on the bottom foundation inside the heating cavity, the supporting brick body A is located on the side close to the low-temperature air duct, and the energy storage body is located on the side close to the high-temperature air duct. The energy storage body and the supporting brick body A divide the heating cavity into A low-temperature air chamber, a high-temperature air chamber B and a high-temperature air chamber A, wherein the low-temperature air chamber is connected to one end of the low-temperature air duct, the high-temperature air chamber A is connected to one end of the high-temperature air duct, the other end of the low-temperature air duct is connected to the air outlet end of the heat cycle fan, the air inlet end of the heat cycle fan is connected to the air outlet end of the heat exchange device through a return air duct, and the air inlet end of the heat exchange device is connected to the other end of the high-temperature air duct. A gas channel A for connecting the low-temperature air chamber and the high-temperature air chamber B is opened in the supporting brick body A, and a gas channel B for connecting the high-temperature air chamber B and the high-temperature air chamber A is opened in the energy storage body;

[0007] Each group of the direct heating components includes a supporting brick body B and a heating unit group that are arranged in conjunction with each other. Each of the heating unit groups includes several heating units. The supporting brick body B of each group of the direct heating components is arranged on the bottom basis of the high-temperature wind chamber B. One end of each heating unit of the heating unit group of each group of the direct heating components is arranged on the supporting brick body B of the direct heating components of the same group, and the other end is arranged on the supporting brick body A. All of the heating units are connected to the external power supply through the heating unit incoming line.

[0008] The number and positions of the heat exchange equipment, heat circulation fan, low-temperature air duct, high-temperature air duct and return air duct correspond to each other.

[0009] A plurality of temperature sensors are provided on the thermal insulation material layer, and a detection end of each of the temperature sensors extends into the energy storage body.

[0010] An inspection door A communicating with the low-temperature air chamber is provided on the thermal insulation material layer.

[0011] An inspection door B connected to the high-temperature air chamber B is provided on the thermal insulation material layer.

[0012] An outer side surface of the return air duct is arranged in close contact with the outer side surface of the heat insulation material layer.

[0013] The return air duct is provided with a return air duct heat preservation layer on each outer side surface of the return air duct except for an outer side surface that is in close contact with the outer side surface of the heat insulation material layer.

[0014] The outsides of the heat exchange equipment and the high-temperature air duct are both covered with a heat exchange equipment insulation layer.

[0015] The heat exchange equipment insulation layer is connected to the return air duct insulation layer and the bottom foundation.

[0016] The thickness of the heat exchange equipment insulation layer is greater than the thickness of the return air duct insulation layer.

[0017] The advantages and positive effects of the present invention are:

[0018] Compared with the traditional single-energy storage body electric heat storage device, the present invention can perform heat exchange with the air for a long time by providing a direct heating component separately from the energy storage body. While the heat output is stable, its service life is also extended and the cost of use is lower; the operating temperature of the energy storage body can reach up to 850°C, and the heat dissipation and air mixing are more uniform; the amount of insulation material used in the heat exchange equipment and the auxiliary air ducts is reduced, the effect is better, the heat loss is smaller, and the overall thermal efficiency is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is one of the structural diagrams of the present invention;

[0020] Figure 2 This is the second structural diagram of the present invention.

[0021] In the figure: 1 is the bottom foundation, 2 is the supporting brick body A, 3 is the heating unit, 4 is the supporting brick body B, 5 is the energy storage body, 6 is the high-temperature air duct, 7 is the heat exchange equipment, 8 is the high-temperature air chamber A, 9 is the return air duct, 10 is the return air duct insulation layer, 11 is the high-temperature air chamber B, 12 is the low-temperature air chamber, 13 is the insulation material layer, 14 is the heating unit inlet line, 15 is the heat circulation fan, 16 is the low-temperature air duct, 17 is the heat exchange equipment insulation layer, 18 is the temperature sensor, 19 is the inspection door A, and 20 is the inspection door B. DETAILED DESCRIPTION

[0022] The following is combined with Figure 1-2 The present invention is described in further detail.

[0023] A heat storage separation type solid electric heat storage device, such as Figure 1-2 As shown, this embodiment includes a bottom foundation 1, an insulating material layer 13, a heat exchange device 7, a heat circulation fan 15, an energy storage body 5, a supporting brick body A2 and three groups of direct heating components arranged in parallel.

[0024] A thermal insulation layer 13 is disposed on the bottom foundation 1. The thermal insulation layer 13 and the bottom foundation 1 form a heating cavity within the overall structure. In this embodiment, the bottom foundation 1 is constructed using existing technology, for example, a concrete foundation, ceramic fiberboard, and high-alumina bricks. The thermal insulation layer 13 is constructed using existing technology and materials, such as aluminum silicate fiber and ceramic fiber.

[0025] One end of the bottom of the whole formed by the insulation material layer 13 and the bottom foundation 1 is provided with one end of the low-temperature air duct 16, and the other end of the bottom of the whole formed by the insulation material layer 13 and the bottom foundation 1 is provided with one end of the high-temperature air duct 6. The energy storage body 5 and the supporting brick body A2 are respectively arranged on the bottom foundation 1 inside the heating cavity. The supporting brick body A2 is located on the side close to the low-temperature air duct 16, and the energy storage body 5 is located on the side close to the high-temperature air duct 6. The energy storage body 5 and the supporting brick body A2 divide the heating cavity into a low-temperature air chamber 12, a high-temperature air chamber B11 and a high-temperature air chamber A8 in sequence. The low-temperature air chamber 12 is connected to one end of the low-temperature air duct 16, and the high-temperature air chamber A8 is connected to one end of the high-temperature air duct 6. The other end of the low-temperature air duct 16 is connected to the air outlet end of the heat circulation fan 15. The air inlet end of the heat circulation fan 15 is connected to the air outlet end of the heat exchange device 7 through the return air duct 9. The air inlet end of the heat exchange device 7 is connected to the other end of the high-temperature air duct 6. 2 is provided with a gas channel A for connecting the low-temperature wind chamber 12 and the high-temperature wind chamber B11, and the energy storage body 5 is provided with a gas channel B for connecting the high-temperature wind chamber B11 and the high-temperature wind chamber A8.

[0026] Each direct heating assembly includes a supporting brick body B4 and a heating unit group. Each heating unit group includes several heating units 3. The supporting brick body B4 of each direct heating assembly is mounted on the bottom foundation 1 within the high-temperature air chamber B11. Each heating unit 3 of each direct heating assembly group has one end mounted on the supporting brick body B4 of the same direct heating assembly and the other end mounted on the supporting brick body A2. All heating units 3 are connected to an external power source via a heating unit inlet 14. In this embodiment, the length of each heating unit 3 is parallel to the direction of gas inflow and outflow of the heating cavity. In this embodiment, the heating units 3, heat exchange equipment 7, and heat circulation fan 15 are all controlled by an external controller. The heating unit inlet 14 utilizes a conventional high-temperature, high-voltage inlet, and the heating units 3 utilize a conventional structure based on electric heating wires. In this embodiment, the energy storage body 5, supporting brick body A2, and supporting brick body B4 are all brick wall structures made of magnesium bricks.

[0027] By separating the heating unit 3 from the energy storage body 5, the heat generated by the heating unit 3 when powered directly heats the air surrounding it in the high-temperature air chamber B11, causing the air temperature to gradually and rapidly rise. Driven by the heat circulation fan 15, the hot air enters the energy storage body 5 along a predetermined path, heating and storing heat there. In this embodiment, when powered, the heating unit 3 can achieve a surface temperature rise reaching its theoretical maximum of 1250°C-1300°C. Similarly, the surrounding air temperature is between 1150°C-1200°C. As the hot air exchanges heat with the energy storage body 5 during circulation, the temperature of the energy storage body 5 can reach 750°C-850°C or even higher, significantly increasing the heat storage density of the energy storage body 5. Separating the heating unit 3 from the energy storage body 5 significantly reduces the risk of failure. Consequently, the design of its surface load can be increased by 1.3-1.8 times, reducing the weight of the heating unit 3, and consequently reducing its overall usage and cost.

[0028] Specifically, in this embodiment, the number and position of the heat exchange equipment 7, heat circulation fan 15, low-temperature air duct 16, high-temperature air duct 6 and return air duct 9 correspond one to one, all three, and correspond to the number and position of the direct heating components, so that the air intake and outlet and heating of the heating cavity are relatively uniform.

[0029] Specifically, in this embodiment, six temperature sensors 18 are provided on the insulating material layer 13, and the detection ends of the six temperature sensors 18 extend from both sides of the device to the inside of the energy storage body 5, respectively, with a total of three temperature sensors 18 on each side. Holes for installing the temperature sensors 18 can be reserved in the energy storage body 5 during the formation stage, and the installation depth and number of the temperature sensors 18 can also be changed at will according to actual needs. The advantage of installing the detection end of the temperature sensor 18 inside the energy storage body 5 is that the real-time temperature can be monitored uninterruptedly, and since it is not interfered with by the heating unit 3, the reading is more accurate, which is of great help to how the equipment operates, and the temperature distribution inside the energy storage body 5 can be more directly understood. In the case of uneven temperature of the energy storage body 5, intervention can be made in advance to make the equipment operation safer.

[0030] Specifically, in this embodiment, an inspection door A19 connected to the low-temperature air chamber 12 is opened on the insulation material layer 13, and an inspection door B20 connected to the high-temperature air chamber B11 is opened on the insulation material layer 13, which is convenient for maintenance.

[0031] Specifically, in this embodiment, an outer side surface of the return air duct 9 is arranged in close contact with the outer side surface of the insulation material layer 13, and a return air duct insulation layer 10 is provided on each outer side surface of the return air duct 9 except for an outer side surface in close contact with the outer side surface of the insulation material layer 13. The outer sides of the heat exchange equipment 7 and the high-temperature air duct 6 are both covered with a heat exchange equipment insulation layer 17. In this embodiment, the return air duct insulation layer 10 and the heat exchange equipment insulation layer 17 can both be composed of aluminum silicate fiber blankets, and the installation and setting method is the existing technology. By arranging an outer side surface of the return air duct 9 in close contact with the outer side surface of the insulation material layer 13, the insulation material required for the outer side surface can be effectively saved, and the insulation effect is also better. The insulation material layer 13 slowly transfers heat from the high-temperature area inside the device to the surface of the insulation material layer 13, and is then absorbed and conducted by the return air duct 9 and the heat exchange equipment 7, and then the heat is brought back to the interior of the device through air circulation, which can save some heat. In this embodiment, the contact area between the return air duct 9 and the heat exchanger 7 and the insulation layer 13 can reach 10%-13% of the entire insulation layer 13. Calculated heat loss can be reduced by approximately 0.5%-1%, which means the thermal efficiency of the device can be increased by 0.5%-1%. This can save a significant amount of electricity, reduce costs, and improve economic efficiency when the device is in operation for a long time. The heat exchanger insulation layer 17 is connected to the return air duct insulation layer 10 and the bottom foundation 1. The thickness of the heat exchanger insulation layer 17 is greater than that of the return air duct insulation layer 10. The heat exchanger insulation layer 17 is also provided between the three heat exchangers 7, effectively ensuring the insulation effect of each heat exchanger 7 and the high-temperature air duct 6.

[0032] Working principle:

[0033] During use, air enters the low-temperature air chamber 12 from the outlet end of the heat circulation fan 15 through the low-temperature air duct 16, and the low-temperature air passes through the supporting brick body A2 and enters the high-temperature air chamber B11. The low-temperature air flows through the heating unit 3 and the supporting brick body B4 in the high-temperature air chamber B11 and is heated. The heated air passes through the energy storage body 5 for heat exchange, and then passes through the high-temperature air chamber A8 and the high-temperature air duct 6 and is discharged from the air inlet end of the heat exchange device 7, and then passes through the heat exchange device 7 for heat exchange. The air that has been heat exchanged in the heat exchange device 7 returns to the low-temperature air chamber 12 through the return air duct 9 and the heat circulation fan 15 in turn, and then passes through the supporting brick body A2, the heating unit 3, the supporting brick body B4 and the energy storage body 5, thereby performing a circulation heat exchange; by providing a direct heating component separately from the energy storage body 5, its upper limit of operating temperature can be increased, and the high-temperature air generated by heating can effectively increase its heat storage density after heat exchange with the energy storage body 5, and the usage of the energy storage body 5 can be steadily reduced, thereby reducing costs and improving economic efficiency.

Claims

1. A heat storage and heat storage separation type solid electric heat storage device, characterized by: It includes a bottom foundation (1), a heat insulation material layer (13), a heat exchange device (7), a heat circulation fan (15), an energy storage body (5), a supporting brick body A (2) and several groups of direct heating components; The heat-insulating material layer (13) is arranged on the bottom foundation (1), and a heating cavity is formed inside the whole formed by the heat-insulating material layer (13) and the bottom foundation (1). One end of the bottom of the whole formed by the heat-insulating material layer (13) and the bottom foundation (1) is provided with one end of a low-temperature air duct (16), and the other end of the bottom of the whole formed by the heat-insulating material layer (13) and the bottom foundation (1) is provided with one end of a high-temperature air duct (6). The energy storage body (5) and the supporting brick body A (2) are respectively arranged on the bottom foundation (1) inside the heating cavity, the supporting brick body A (2) is located on the side close to the low-temperature air duct (16), and the energy storage body (5) is located on the side close to the high-temperature air duct (6). The energy storage body (5) and the supporting brick body A (2) divide the heating cavity into low-temperature air duct (16) and high-temperature air duct (6). The low-temperature air chamber (12), the high-temperature air chamber B (11) and the high-temperature air chamber A (8), the low-temperature air chamber (12) is connected to one end of the low-temperature air duct (16), the high-temperature air chamber A (8) is connected to one end of the high-temperature air duct (6), the other end of the low-temperature air duct (16) is connected to the air outlet end of the heat circulation fan (15), the air inlet end of the heat circulation fan (15) is connected to the air outlet end of the heat exchange device (7) through the return air duct (9), the air inlet end of the heat exchange device (7) is connected to the other end of the high-temperature air duct (6), the supporting brick body A (2) is provided with a gas channel A for connecting the low-temperature air chamber (12) and the high-temperature air chamber B (11), and the energy storage body (5) is provided with a gas channel B for connecting the high-temperature air chamber B (11) and the high-temperature air chamber A (8); Each group of the direct heating components comprises a supporting brick body B (4) and a heating unit group that are arranged in conjunction with each other. Each heating unit group comprises a plurality of heating units (3). The supporting brick body B (4) of each group of the direct heating components is arranged on the bottom foundation (1) in the high-temperature air chamber B (11). One end of each heating unit (3) of the heating unit group of each group of the direct heating components is arranged on the supporting brick body B (4) of the direct heating components of the same group, and the other end is arranged on the supporting brick body A (2). All the heating units (3) are connected to an external power supply through a heating unit inlet line (14).

2. The heat storage and heating separation type solid electric thermal storage device according to claim 1, characterized in that: The number and positions of the heat exchange equipment (7), heat circulation fan (15), low-temperature air duct (16), high-temperature air duct (6) and return air duct (9) are all in one-to-one correspondence.

3. The heat storage and heat addition separation type solid electric heat storage device according to claim 1, characterized in that: A plurality of temperature sensors (18) are provided on the thermal insulation material layer (13), and the detection end of each temperature sensor (18) extends into the energy storage body (5).

4. The heat storage and heat addition separation type solid electric heat storage device according to claim 1, characterized in that: An inspection door A (19) communicating with the low-temperature air chamber (12) is provided on the thermal insulation material layer (13).

5. The heat storage and heat addition separation type solid electric heat storage device according to claim 1, characterized in that: An inspection door B (20) communicating with the high-temperature air chamber B (11) is provided on the heat-insulating material layer (13).

6. The heat storage and heat addition separation type solid electric heat storage device according to claim 1, characterized in that: An outer side surface of the return air duct (9) is arranged in close contact with the outer side surface of the thermal insulation material layer (13).

7. The heat storage and heat addition separation type solid electric heat storage device according to claim 6, characterized in that: A return air duct insulation layer (10) is provided on each outer side of the return air duct (9) except for an outer side surface that is in close contact with the outer side surface of the heat insulating material layer (13).

8. The heat storage and heat addition separation type solid electric heat storage device according to claim 7, characterized in that: The outer sides of the heat exchange equipment (7) and the high-temperature air duct (6) are both covered with a heat exchange equipment insulation layer (17).

9. The heat storage and heat addition separation type solid electric heat storage device according to claim 8, characterized in that: The heat exchange equipment insulation layer (17) is connected to the return air duct insulation layer (10) and the bottom foundation (1).

10. The heat storage and heat addition separation type solid electric heat storage device according to claim 8, characterized in that: The thickness of the heat exchange equipment insulation layer (17) is greater than the thickness of the return air duct insulation layer (10).

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