High-efficiency heat storage structure of solid heat storage body

Abstract

An efficient heat storage structure for a solid heat storage body, which can orderly store the heat energy carried by a high-temperature medium in the solid heat storage body according to its different temperature gradients and can effectively release the heat energy. The buried tube type heat storage body adopted by the heat storage structure of the present invention is composed of two, three or more buried tube type heat storage body units separated by a vertical heat insulation layer; natural stone with a relatively high thermal conductivity (≥3 W / (m·K)) and good economy is selected as the main material of the heat storage body, and the thermal conductivity is more than twice that of the traditional sintered refractory material, effectively reducing the thermal resistance in the heat exchange process; in order to reduce the difficulty of processing the mortise and tenon structure of the structural block, a structure of a fixed positioning port and a fixed pin is adopted to ensure the stability and safety of the overall structure. The pipe docking device can effectively avoid the problems of complex and changeable welding surfaces, cumbersome processes, inconvenient X-ray flaw detection, etc. caused by direct welding connection between multiple high-pressure metal pipes, and cannot ensure the reliability and safety of multi-pipe connection.

Description

Technical Field

[0001] The present invention belongs to the technical field of solid material thermal energy storage, and particularly relates to a high-efficiency heat storage structure of a solid heat storage body that can orderly store the thermal energy carried by a high-temperature medium in a plurality of solid heat storage bodies according to different temperature gradients and can efficiently release the thermal energy. Background Art

[0002] The thermal energy carried in the waste heat steam generated by power plants and heat source plants, including the sensible heat and latent heat of the steam, accounts for more than 50% of the latent heat of the energy, and the release temperature decreases as the working pressure of the steam decreases. Sending saturated steam into a shell-and-tube heat exchanger to establish a stable high-pressure state of the steam, and using the hot air flowing through the shell side of the shell-and-tube heat exchanger to heat the solid heat storage body; the form of heat release of the thermal energy with a temperature higher than the latent heat temperature is the gaseous heat release of the steam, and the form of heat release of the thermal energy lower than the latent heat temperature is the liquid heat release of hot water. The gaseous heat exchange of steam and the liquid heat exchange of hot water have the characteristics of a large temperature difference and a uniform distribution of energy density along the temperature gradient, and the phase change process does not occur during the heat release process, which is suitable for using a high-pressure metal pipe bundle group to directly contact the solid heat storage body for heat exchange and energy storage. In the solid heat storage body structure, without reducing the working pressure of the input steam, to enable the steam flowing through the tube side of the heat exchanger to release the phase change latent heat thermal energy in a high-temperature range, it is necessary to improve the pressure-bearing grade of the metal pipes inside the equipment and at the same time have reliable pipe connection components.

[0003] Generally, the heat storage bodies constituting the solid thermal energy storage structure are made of sintered bricks, high-temperature concrete or refractory castables with better economy. Using such solid heat storage bodies to store the excess steam thermal energy has the characteristics of simple molding, good material economy, wide distribution, etc. However, the solid heat storage bodies made of traditional sintered bricks, high-temperature concrete or refractory castables have a small thermal conductivity (<1.5 W / (m·K)), that is, poor heat conduction ability and large heat transfer resistance, resulting in a large difference (more than 100 °C) between the heat storage temperature of the primary input steam and the temperature of the secondary output steam; therefore, the low thermal conductivity of solid materials and the lack of detailed zoning of the thermal energy storage structure lead to the insufficient heat storage per unit volume of the solid heat storage body made of traditional sintered bricks, high-temperature concrete or refractory castables being less than 15 kWh, resulting in a large volume of the equipment, poor comprehensive economy, and higher requirements for the overall structural stability and seismic resistance of the structure.

[0004] In summary, to design a high-efficiency heat storage structure of a solid heat storage body and improve the performance of the steam heat storage device, the following should be achieved: First, design a pipeline docking device to ensure the reliability of the high-pressure steam pipeline connection; second, select a solid heat storage body with a larger thermal conductivity (≥3 W / (m·K)) and can be stably built to improve the heat storage capacity of the solid heat storage body; third, design a buried-tube heat storage body structure with detailed temperature gradient zoning storage to improve the heat release output capacity of the equipment. Summary of the Invention

[0005] In view of the problems existing in the above-mentioned prior art, the present invention proposes an efficient heat storage structure for a solid heat storage body. In this structure, a pipeline loop is formed through a pipeline connector, and the working pressure can be greater than 10 MPa; materials with good economy and high thermal conductivity (≥3 W / (m·K)) are used, and it is set to be convenient for riveting and fixing; by arranging a plurality of vertical heat insulation structures in the buried pipe heat storage body, the temperature gradient is stored in a detailed partition.

[0006] The technical solution adopted by the present invention is as follows: An efficient heat storage structure for a solid heat storage body includes a buried pipe heat storage body, a duct heat storage body, an adiabatic base layer, and a heat insulation body. It is characterized in that: a buried pipe heat storage body, a horizontal heat insulation layer, a duct heat storage body, a horizontal heat insulation layer, and a buried pipe heat storage body are sequentially arranged upward on the adiabatic base layer; the buried pipe heat storage body is composed of two, three or more buried pipe heat storage body units separated by vertical heat insulation layers. An expansion absorption layer and a thermal conductive cement layer are sequentially arranged on the outer surface of the high-pressure metal pipes evenly distributed in the buried pipe heat storage body units. The high-pressure metal pipes in two adjacent buried pipe heat storage body units are connected and communicated by a pipeline connector. The buried pipe heat storage body unit is composed of a pipeline heat storage block and a pipeline heat storage spacer block masonry structure; the pipeline connector is a pressure vessel formed by welding two perforated tube plates through a shell; the duct heat storage body is a structure in which a duct heat storage main block, a transverse heat storage half-cut block, and a longitudinal heat storage half-cut block horizontally arranged form a vertical plane with evenly distributed ducts and auxiliary ducts. Block fixing pins are arranged in the through fixed positioning through holes facing each other between the odd layers and the even layers of this structure.

[0007] The pipeline connector is arranged outside the buried pipe heat storage body.

[0008] The duct heat storage main block, the transverse heat storage half-cut block, the longitudinal heat storage half-cut block, the pipeline heat storage block, and the pipeline heat storage spacer block are solid blocks with a temperature tolerance of 500 - 600 °C; including: natural granite, basalt, or concrete blocks containing heat conductive materials.

[0009] The even layers are composed of a duct heat storage main block and a longitudinal heat storage half-cut block.

[0010] The even layers are composed of a duct heat storage main block and a longitudinal heat storage half-cut block.

[0011] The horizontal heat insulation layer is a heat insulation structure arranged between the buried pipe heat storage body and the duct heat storage body, and is an integral structure cast with a heat insulation refractory castable that can withstand the gravity of the buried pipe heat storage body and the duct heat storage body and the working temperature of the solid heat storage body.

[0012] The vertical heat insulation layer is an integral structure formed by masonry of hollow heat insulation blocks or casting of heat insulation casting materials.

[0013] The present invention has the following advantages and effects: the buried tube heat storage body in the solid heat storage body high-efficiency heat storage structure is composed of two, three or more buried tube heat storage body units separated by vertical insulation layers, and its unit structure can divide the total heat energy into multiple temperature gradients for storage, and independently insulate each other, that is, widen the temperature difference of the stored heat energy between the head and tail units, and ensure that high-temperature heat energy is stored in the high-temperature unit, and lower-temperature heat energy is stored in the low-temperature unit, effectively avoiding the lateral and longitudinal heat leakage problems of the buried tube heat storage body structure without a heat insulation structure; the pipe docking device can effectively avoid the direct welding connection between multiple bundles of high-pressure metal pipes, especially when the diameters, wall thicknesses and numbers of high-pressure metal pipes docked in adjacent buried tube heat storage body units are different, resulting in complex and changeable welding surfaces, cumbersome processes, inconvenience in X-ray flaw detection, etc., and the reliability and safety of multi-tube connections cannot be guaranteed; the pipe docking device can also Valves and connecting pipes are provided to facilitate the conversion of the heat storage and heat release working states, and to adjust and change the connection relationship between the buried heat storage units, so as to facilitate the matching of the balance of heat storage energy and heat release energy of the buried heat storage units and improve the utilization efficiency of the buried heat storage units. In order to ensure the efficient and stable heat exchange of solid blocks, natural stone with high thermal conductivity (≥3W / (m·K)) and good economy is selected as the main material of the heat storage body. Compared with the thermal conductivity of traditional sintered refractory materials, it is twice as high, which effectively reduces the thermal resistance in the heat exchange process. In order to improve the overall stability and seismic resistance of the duct-type heat storage body made of natural stone and reduce the difficulty of processing the mortise and tenon structure of natural stone, the core drill is used to drill fixed positioning through holes in the horizontal plane, and the basic positioning pins and block fixing pins are set in the fixed positioning through holes that penetrate between layers. In this way, the rivet pin structure ensures the reliability of the duct-type heat storage body structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The following is a detailed description of the specific implementation of the present invention in conjunction with the accompanying drawings. The following description is only for demonstration and explanation, and does not limit the present invention in any form. This accompanying drawing is only a schematic diagram of an implementation case of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on this accompanying drawing without creative work.

[0015] Figure 1 This is a schematic diagram of a high-efficiency heat storage structure of a solid heat storage body of the present invention;

[0016] Figure 2 It is a schematic diagram of the buried tube heat storage body of the present invention;

[0017] Figure 3 It is a cross-sectional view taken along the AA direction in the schematic diagram of the buried tube heat storage body of the present invention;

[0018] Figure 4 It is a schematic diagram of node B in the AA section view of the present invention;

[0019] Figure 5 is a schematic diagram of the pipeline docking device of the present invention;

[0020] Figure 6 is a sectional view taken along the C-C direction in the schematic diagram of the pipeline docking device of the present invention;

[0021] Figure 7 is a schematic diagram of the air duct type heat storage body of the present invention;

[0022] Figure 8 is a schematic diagram of the odd-numbered layers in the schematic diagram of the air duct type heat storage body of the present invention;

[0023] Figure 9 is a schematic diagram of the even-numbered layers in the schematic diagram of the air duct type heat storage body of the present invention;

[0024] Figure 10 is in the present invention Figure 7 schematic diagram of the D node of the air duct type heat storage body.

[0025] Description of the main components in the figure: 1. Buried pipe type heat storage body unit, 1-1. Pipe heat storage block, 1-2. Pipe heat storage spacer block; 2. Pipe A-end interface, 3. High-pressure metal pipe, 3-1. Expansion absorption layer, 3-2. Thermal conductive mastic layer, 4. Pipeline docking device, 4-1. Shell, 4-2. Tube sheet, 5. Vertical heat insulator, 6. Pipe B-end interface, 10. Air duct type heat storage body, 10-1. Odd-numbered layers, 10-2. Even-numbered layers, 10-3. Main air duct heat storage block, 10-4. Transverse heat storage half-cut block, 10-5. Longitudinal heat storage half-cut block, 10-6. Fixed positioning through hole, 11. Air duct, 11-1. Auxiliary air duct, 12. Block fixing pin, 13. Foundation fixing pin, 14. Horizontal heat insulator.

[0026] This attached drawing is only a schematic diagram of an embodiment of the present invention. For those of ordinary skill in the art, without creative efforts, other attached drawings can be obtained based on this set of attached drawings. Specific Embodiments

[0027] The following will describe in detail the specific embodiments of the present invention with reference to the attached drawings. The following description is only for demonstration and explanation, and does not impose any form of limitation on the present invention. Embodiment

[0028] As Figures 1-10As shown in the figure, the present invention belongs to the technical field of solid material thermal energy storage, and particularly relates to a high-efficiency heat storage structure of a solid heat storage body that can orderly store the thermal energy carried by a high-temperature medium in the solid heat storage body according to the different temperature gradients and can effectively release it. It includes: a buried-tube heat storage body unit 1, a pipe heat storage block 1-1, a pipe heat storage spacer block 1-2, a pipe A-end interface 2, a high-pressure metal pipe 3, an expansion absorption layer 3-1, a heat-conducting cement layer 3-2, a pipe connector 4, a pipe shell 4-1, a tube sheet 4-2, a vertical heat insulation layer 5, a pipe B-end interface 6, a duct-type heat storage body 10, an odd layer 10-1, an even layer 10-2, a duct heat storage main block 10-3, a transverse heat storage semi-cut block 10-4, a longitudinal heat storage semi-cut block 10-5, a fixed positioning through hole 10-6, a duct 11, an auxiliary duct 11-1, a block fixing pin 12, a foundation fixing pin 13, a horizontal heat insulation layer 14, and an adiabatic base layer 14-1. In the high-efficiency heat storage structure of the solid heat storage body, a buried-tube heat storage body, a horizontal heat insulation layer 14, a duct-type heat storage body 10, a horizontal heat insulation layer 1, and a buried-tube heat storage body are sequentially arranged upward on the adiabatic base layer 14-1; the buried-tube heat storage body is composed of two, three or more buried-tube heat storage body units 1 separated by a vertical heat insulation layer 5. An expansion absorption layer 3-1 and a heat-conducting cement layer 3-2 are arranged on the outer surface of the high-pressure metal pipe 3 arranged in each buried-tube heat storage body unit 1. The high-pressure metal pipes 3 in adjacent buried-tube heat storage body units 1 are connected by a pipe connector 4 to form a serpentine high-pressure metal pipe bundle layout. One end of the high-pressure metal pipe bundle is connected to the pipe A-end interface 2, and the other end is connected to the pipe B-end interface 6; the heat storage body in the buried-tube heat storage body unit 1 is built by the pipe heat storage block 1-1 and the pipe heat storage spacer block 1-2; the vertical heat insulation body 5 is built with hollow heat insulation blocks or poured with heat insulation casting material; the pipe connector 4 is a pressure vessel welded by two porous tube sheets 4-2 through a pipe shell 4-1; the duct-type heat storage body 10 is a structure in which a duct heat storage main block 10-3, a transverse heat storage semi-cut block 10-4, and a longitudinal heat storage semi-cut block 10-5 are built to form a structure with uniformly distributed ducts and auxiliary ducts on a vertical plane, and are built in an alternating form of odd layers 10-1 and even layers 10-2, and are aligned with the fixed positioning through holes 10-6 of each layer, and at the same time form a structure of a duct 11 and an auxiliary duct 11-1. The layer-to-layer alignment through holes are fixed by a foundation positioning pin 13 and a block fixing pin 12; the odd layer 10-1 is composed of a duct heat storage main block 10-3 and a transverse heat storage semi-cut block 10-4; the even layer 10-2 is composed of a duct heat storage main block 10-1 and a longitudinal heat storage semi-cut block 10-5; among them, each block is provided with a fixed positioning through hole 10-6 structure; the horizontal heat insulation body 14 is a heat insulation structure arranged between the buried-tube heat storage body and the duct-type heat storage body 10, and is poured with heat insulation concrete resistant to high pressure and high temperature.

[0029] Structural and working description of the buried-tube heat storage body: During the heat storage process, the buried-tube heat storage body absorbs the thermal energy carried by the inflowing superheated steam (hot water) and heats up. During the heat storage process, the superheated steam (hot water) enters the multiple high-pressure metal pipes 3 in the buried-tube heat storage body through the interface 2 at the A end of the pipe. The thermal energy carried by the superheated steam (hot water) is released from the high-pressure metal pipes 3 to the pipe heat storage blocks 1-1 and the pipe heat storage spacer blocks 1-2 through the expansion absorption layer 3-1 and the heat-conducting mortar layer 3-2. After cooling down, it flows out from the interface 6 at the B end of the pipe, and the intercepted thermal energy is stored in the buried-tube heat storage body; to improve the utilization rate of the absorbed thermal energy of the buried-tube heat storage body and increase the energy storage temperature difference between the inlet end and the outlet end of the heat storage body, the structure of the buried-tube heat storage body is improved to be composed of two, three or more buried-tube heat storage body units separated by the vertical heat insulation layer 5. On the premise that the total amount of stored thermal energy remains unchanged, the thermal energy is stored in multiple temperature gradients and the vertical heat insulation bodies 5 are arranged between them to reduce the heat conduction phenomenon between adjacent buried-tube heat storage body units 1, that is, to increase the temperature difference value of the stored thermal energy between the first and the last buried-tube heat storage body units 1; to ensure the reliable connection between the multiple high-pressure metal pipes 3 in each buried-tube heat storage body unit 1, a pipe coupler 4 is used for centralized connection to form a serpentine pipe connection structure to match the multiple temperature gradients of the buried-tube heat storage body unit 1 for storing thermal energy; during the heat release process, the buried-tube heat storage body releases the stored thermal energy to the inflowing steam (hot water) and cools down. During the heat release process, the steam (hot water) enters the multiple high-pressure metal pipes 3 in the buried-tube heat storage body through the interface 6 at the B end of the pipe. The steam (hot water) absorbs the thermal energy of different temperature gradients released from each buried-tube heat storage body unit 1 through the high-pressure metal pipes 3. After heating up, it flows out from the interface 2 at the A end of the pipe, and the thermal energy stored in the buried-tube heat storage body is effectively released; to ensure that each buried-tube heat storage body unit 1 of the buried-tube heat storage body can be effectively released to the maximum extent, valves and connecting pipes can be set in the pipe coupler 4 in the serpentine pipe connection structure. When the steam (hot water) meets the requirements in a certain section, the valve can be opened for external output. When it does not meet the requirements or there is no demand, it can also be closed and enter the next buried-tube heat storage body unit 1 for heating. On the premise of ensuring the effective release of the stored thermal energy in gradients, the output can be flexibly set to improve the utilization efficiency of the buried-tube heat storage body unit 1.

[0030] Advantages: 1. The buried tube heat storage body is composed of one, two or more buried tube heat storage body units separated by vertical heat insulation layers. The heat energy is stored in multiple units with multiple temperature gradients and is insulated independently. That is, it increases the temperature difference value of the heat energy stored between the head and tail units, and ensures that the high-temperature heat energy is stored in the high-temperature unit and the lower-temperature heat energy is stored in the low-temperature unit, effectively avoiding the problem of lateral and longitudinal heat leakage in the single heat storage body structure without a heat insulation body; 2. The pipeline coupler 4 not only improves the welding process of the pipeline and is convenient for inspection, but also has valves and connecting pipelines in its structure. When converting the heat storage and heat release working states, it is convenient to adjust and change the connection relationship between the buried tube heat storage body units 1, which is convenient for matching the balance of the heat storage energy and heat release energy of the buried tube heat storage body unit 1, and improves the use efficiency of the buried tube heat storage body unit 1.

[0031] Structural description of the pipeline coupler 4: The pipeline coupler 4 is a pressure vessel welded by two perforated tube plates 4-2 through a shell 4-1. Each perforated tube plate 4-2 corresponds to a group of multi-beam high-pressure metal pipelines 3 in the adjacent buried tube heat storage body unit 1. The high-pressure metal pipelines 3 gathered in the same perforated tube plate plane are welded together, which is convenient for X-ray flaw detection and ensures the reliability and safety of the overall connection; after using the pipeline coupler 4, the advantages are: 1. It changes the direct welding connection between the high-pressure metal pipelines 3, which causes complex and variable welding surfaces, cumbersome processes, inconvenient X-ray flaw detection, and cannot ensure the reliability and safety of multi-pipe connections. Therefore, using the pipeline coupler 4 can well avoid the above defects. 2. In addition to completing the docking function of the metal pipelines 3, the pipeline coupler 4 can also install valves and connecting pipelines on the shell 4-1 within the two opposite perforated tube plates 4-2. When converting the heat storage and heat release working states, it is convenient to adjust and change the connection relationship between the buried tube heat storage body units 1, which is convenient for matching the balance of the heat storage energy and heat release energy of the buried tube heat storage body unit 1, and improves the use efficiency of the buried tube heat storage body unit 1.

[0032] Structural and working description of the air duct type heat storage body 10: The heat storage process is a temperature rise process in which the air duct type heat storage body 10 absorbs the heat energy of the inflowing high-temperature circulating hot air. During the heat storage working process, the circulating hot air runs along the air duct 11 in the forward direction, that is, the high-temperature circulating hot air enters from the high-temperature end of the air duct type heat storage body 10 and flows out from the low-temperature end, storing the heat energy in the air duct type heat storage body 10; the heat release process is a temperature drop process in which the air duct type heat storage body 10 releases heat energy to the outflowing circulating hot air. During the heat release working process, the circulating hot air runs along the air duct 11 in the reverse direction, that is, the low-temperature circulating hot air enters from the low-temperature end of the air duct type heat storage body 10 and flows out from the high-temperature end, increasing the temperature of the high-temperature circulating hot air; in the air duct type heat storage body 10, the air duct 11 is divided into multiple interconnected air ducts by the auxiliary air duct 11-1, so that the circulating hot air flowing through the air duct 11 is disturbed when it encounters the auxiliary air duct 11-1, increasing the heat exchange effect between the circulating hot air and the air duct 11 and the auxiliary air duct 11-1; to ensure efficient and stable heat exchange of the solid block, natural granite with a relatively high thermal conductivity (≥3 W / (m·K)) and good economy is selected as the main material of the heat storage body. Compared with the traditional sintered refractory material, the thermal conductivity is more than twice as high, effectively reducing the thermal resistance during the heat exchange process; to improve the overall stability and seismic resistance of the air duct type heat storage body 10 made of natural stone and reduce the difficulty of processing the mortise and tenon structure of natural stone, a core drill is used to drill fixed positioning through holes 10-6 on the horizontal plane. During the alternating masonry process of the odd layers 10-1 and the even layers 10-2, the basic positioning pins 13 and the block fixing pins 12 are set and fixed in the fixed positioning through holes 10-6 that are interconnected between the layers. Such a rivet and pin structure ensures the structural reliability of the air duct type heat storage body 10.

[0033] Finally, it should be noted that the above specific implementation manners are only used to illustrate the technical solutions of the present invention and are not restrictive. Although the present invention has been described in detail, those of ordinary skill in the art should understand that the implementation manners of the present invention can be modified or equivalently replaced without departing from the spirit and scope of the implementation manners of the present invention, and they should all be covered by the scope of the claims of the present invention.

Claims

1. An efficient heat storage structure for a solid heat storage body, which comprises a buried-tube heat storage body, a duct-type heat storage body, an adiabatic base layer, and a heat insulator, and is characterized in that: On the adiabatic base layer, a buried-tube heat storage body, a horizontal heat insulation layer, a duct-type heat storage body, a horizontal heat insulation layer, and a buried-tube heat storage body are sequentially arranged upward; the buried-tube heat storage body is composed of two, three or more buried-tube heat storage body units separated by a vertical heat insulation layer. An expansion absorption layer and a heat-conducting plaster layer are sequentially arranged on the outer surface of the high-pressure metal pipes evenly distributed in the buried-tube heat storage body units. The high-pressure metal pipes in two adjacent buried-tube heat storage body units are connected and communicated by a pipe coupler. The buried-tube heat storage body unit is composed of a pipe heat storage block and a pipe heat storage spacer block masonry structure; the pipe coupler is a pressure vessel formed by welding two perforated tube plates with a shell; the duct-type heat storage body is a structure in which a duct heat storage main block, a transverse heat storage half-cut block, and a longitudinal heat storage half-cut block with fixed positioning through holes arranged horizontally are used to build a vertical surface with evenly distributed air ducts and auxiliary air ducts. Block fixing pins are arranged in the through fixed positioning through holes facing each other between the odd layers and the even layers of this structure.

2. The high-efficiency heat storage structure of the solid heat storage body according to claim 1, wherein: The pipe coupler is arranged outside the buried-tube heat storage body.

3. The high-efficiency heat storage structure of the solid heat storage body according to claim 1, characterized in that: The temperature tolerance of the duct heat storage main block, the transverse heat storage half-cut block, the longitudinal heat storage half-cut block, the pipe heat storage block, and the pipe heat storage spacer block is Solid blocks of 500-600 °C; including: natural granite, basalt, or concrete blocks containing heat-conducting materials.

4. The high-efficiency heat storage structure of the solid heat storage body according to claim 1, wherein: The odd layers are composed of a duct heat storage main block and a transverse heat storage half-cut block.

5. The high-efficiency heat storage structure of the solid heat storage body according to claim 1, characterized in that: The even layers are composed of a duct heat storage main block and a longitudinal heat storage half-cut block.

6. The high-efficiency heat storage structure of the solid heat storage body according to claim 1, wherein: The horizontal heat insulation layer is a heat insulation structure arranged between the buried-tube heat storage body and the duct-type heat storage body, and is an integral structure cast with a heat insulation refractory castable capable of withstanding the gravity of the buried-tube heat storage body and the duct-type heat storage body and the working temperature of the solid heat storage body.

7. The high-efficiency heat storage structure of the solid heat storage body according to claim 1, characterized in that: The vertical heat insulation layer is an integral structure built with hollow heat insulation blocks or cast with heat insulation casting materials.

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