Cooling structure of high-temperature wall bushing

Abstract

A cooling structure of a high-temperature wall bushing comprises isolation grooves formed in the two sides of a heat preservation shell of a solid electric heat storage boiler, an air cooling heat dissipation device and an insulation and heat insulation cover, and the isolation grooves are formed below the position, where the high-temperature wall bushing is installed, of the original solid electric heat storage boiler. The discharge safety distance required by downward movement for mounting the high-temperature wall bushing is met, so that low-temperature hot air flowing back to a low-temperature area from a heat accumulator insulation base by a circulating fan through an air return channel smoothly enters a door opening-shaped component enclosed by an insulation thermal insulation cover to cool a conducting rod insulation sleeve; when the circulating fan is in shutdown or low-air-volume operation, the air-cooling heat dissipation device is started to reduce the environment temperature of the conductive rod insulation sleeve, so that the part of the conductive rod insulation sleeve in the electric heat storage furnace can be located in a low-temperature air field, and the situation that the conductive rod insulation sleeve is overheated due to the environment temperature of the conductive rod insulation sleeve is avoided. The service life is shortened due to the reduction of the withstand voltage insulation strength, and even the voltage breakdown is avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of high - voltage power supply connection for solid - state electric heat storage furnaces, and specifically, it is a cooling structure for high - temperature wall - penetrating bushings. Background Art

[0002] Currently, in some projects where solid - state electric heat storage boilers output high - temperature and high - pressure steam, when using the 700 °C solid heat storage body set in a traditional solid - state electric heat storage furnace for heat release, the available temperature gradient of the heat storage body will become smaller. Especially when the steam output temperature reaches above 500 °C, the effective heat - release temperature gradient of the heat storage body cycle is less than 150 °C. Only by increasing the upper temperature limit of the solid heat storage body to increase the heat - release temperature difference of the solid heat storage body can the heat storage capacity of the solid heat storage body be improved. However, when increasing the upper heat - storage temperature limit of the solid heat storage body, the temperatures of all parts in the solid - state electric heat storage furnace will increase accordingly. When the heat - storage temperature in the heat - preservation shell of the solid - state electric heat storage furnace reaches above 800 °C, the ambient temperature of the high - temperature wall - penetrating bushing installed in the low - temperature area for connecting 10 kV - 110 kV power supply may exceed the upper limit value of the working temperature that the 720 °C high - temperature wall - penetrating bushing can withstand, which will accelerate the aging of the high - temperature wall - penetrating bushing and shorten the service life of the high - voltage wall - penetrating bushing. How to create a working environment below 700 °C for the installation position of the high - temperature wall - penetrating bushing in the solid - state electric heat storage furnace when the working temperature of the solid heat storage body is above 800 °C, so that the high - temperature wall - penetrating bushing can work safely and reliably, effectively improve the heat - storage energy of the heat storage body, and further improve the comprehensive economic value of the electric heat storage furnace.

[0003] Therefore, in view of the above - mentioned technical problems, the present invention provides a cooling structure for a high - temperature wall - penetrating bushing. Summary of the Invention

[0004] In view of the above - mentioned technical requirements, the purpose of the present invention is to provide a cooling structure for a high - temperature wall - penetrating bushing, aiming to solve the problem that when the heat - storage temperature of a solid - state electric heat storage boiler is above 800 °C, the insulation strength of the high - temperature wall - penetrating bushing for connecting 10 kV - 110 kV high - voltage power supply is ensured, thereby preventing the occurrence of discharge breakdown faults and causing the shutdown of solid - state electric heat storage equipment.

[0005] In order to achieve the above - mentioned purpose, the present invention adopts the following technical solutions: The present invention provides a cooling structure for a high - temperature wall - penetrating bushing, including a solid - state electric heat storage boiler. There is a heat - preservation shell outside the solid - state electric heat storage boiler, and a low - temperature area is formed between the heat - preservation shell and the solid - state electric heat storage boiler. The high - temperature wall - penetrating bushing is connected to the low - temperature area through a return air channel, and there is a high - temperature wall - penetrating bushing on the heat - preservation shell. The cooling structure of the high - temperature wall - penetrating bushing further includes isolation grooves, air - cooled heat - dissipation devices, and insulation and heat - insulation covers arranged on both sides of the heat - preservation shell of the solid - state electric heat storage boiler; The isolation groove is arranged below the horizontal axis of the high-temperature wall-through bushing penetrating the heat-insulating shell, and is composed of a concrete building component with a heat-insulating layer installed under the standard ground; The insulation and heat-insulation cover is arranged in the low-temperature area and covers the outside of the high-temperature wall-through bushing. It is a door-shaped component made of heat-resistant and heat-insulating materials that creates a low-temperature environment for the high-temperature wall-through bushing and is connected to the heat-insulating shell. Moreover, the insulation and heat-insulation cover and the heat-insulating shell form a heat-insulation area; The air-cooled heat dissipation device is connected to the heat-insulation area formed by the insulation and heat-insulation cover and the heat-insulating shell through the air intake port and the air return port. It is a cooling circulation device that can control the ambient temperature of the high-temperature wall-through bushing. Among them, the air intake port is arranged above the horizontal line of the high-temperature wall-through bushing, and the air return port is arranged below the horizontal line of the high-temperature wall-through bushing.

[0006] Furthermore, the air-cooled heat dissipation device includes an air-cooled radiator, a heat dissipation fan, a high-temperature air duct, and a low-temperature air return duct. The air-cooled radiator is a metal plate heat exchanger with one end connected to the heat-insulating shell inside the insulation and heat-insulation cover above the upper end of the high-temperature wall-through bushing through the high-temperature air duct penetrating the heat-insulating shell, and the other end connected to the heat dissipation fan. The other end of the heat dissipation fan is connected to the heat-insulating shell inside the insulation and heat-insulation cover below the lower end of the high-temperature wall-through bushing through the low-temperature air return duct, and the air outlet of the low-temperature air return duct points to the high-temperature wall-through bushing.

[0007] Furthermore, the air-cooled heat dissipation device also includes a temperature sensor inside the cover, which is fixed on the heat-insulating shell, and the temperature measuring end is inserted into the inside of the insulation and heat-insulation cover.

[0008] Furthermore, the bottom of the isolation groove is 0.5 - 2.5 meters away from the horizontal axis of the high-temperature wall-through bushing.

[0009] Furthermore, the high-temperature wall-through bushing is an electrical connection device composed of a support insulator, an insulating bushing, a conductive rod insulating sleeve, a conductive rod, and a resistance wire lead-out wire that can introduce a 10kV - 110kV power supply into the solid electric heat storage boiler. The conductive rod passes through the heat-insulating shell and is connected to the solid electric heat storage boiler through a resistance wire. The conductive rod insulating sleeve is sleeved outside the conductive rod, and the insulating bushing is sleeved on one side of the conductive rod insulating sleeve outside the heat-insulating shell, and is supported in the isolation groove through a support insulator.

[0010] Furthermore, the solid electric heat storage boiler is a solid electric heat storage device composed of a solid heat storage body, a heat-insulating shell, a heat storage body insulating foundation, a heat exchanger, a circulation fan, a return air channel, a high-temperature area, and a low-temperature area that can convert electrical energy into storable heat energy and output the heat energy in the form of heat media such as hot water, steam, hot air, and heat-conducting oil. The solid heat storage body, the heat exchanger, and the circulation fan are connected in sequence. The solid heat storage body is supported on the ground through multiple heat storage body insulating foundations. A high-temperature area is formed between the solid heat storage body and the heat exchanger, and the circulation fan is connected to the low-temperature area through the return air channel.

[0011] The technical solution adopted by the present invention has the following advantages: By setting up an isolation groove below the position where the high-temperature through-wall sleeve is installed in the original solid electric heat storage boiler, the discharge safety distance required for installing the high-temperature through-wall sleeve downward is satisfied, so that the high-voltage power supply incoming high-temperature through-wall sleeve can be installed within the height of 300 mm to 1200 mm above the standard ground. The low-temperature hot air below 550 °C that the circulating fan returns from the heat storage body insulation foundation to the low-temperature area through the return air duct can smoothly enter the portal-shaped component surrounded by the insulation and heat insulation cover to cool the conductive rod insulating sleeve; when the circulating fan is shut down or running at a low air volume, when the low-temperature hot air below 550 °C returning from the heat storage body insulation foundation cannot reduce the ambient temperature of the conductive rod insulating sleeve to below 650 °C, the air-cooled heat dissipation device can also reduce the ambient temperature of the conductive rod insulating sleeve to below 650 °C. Furthermore, the part of the conductive rod insulating sleeve inside the electric heat storage furnace can be in a low-temperature air field, avoiding accidents such as a reduction in the withstand voltage insulation strength, shortening of the service life, and even voltage breakdown when the ambient temperature of the conductive rod insulating sleeve exceeds 720 °C. Through an easily implemented installation structure method, the insulation strength problem of electrical materials in a high-temperature environment is solved, which can not only solve the low-cost problem but also solve the problem of electrical safety. It avoids accidents such as a reduction in the withstand voltage insulation strength, shortening of the service life, and even voltage breakdown due to the over-temperature of the ambient temperature of the conductive rod insulating sleeve. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] By reading the following detailed description with reference to the accompanying drawings, the above and other objects, features, and advantages of the exemplary embodiments of the present invention will become readily understood. In the drawings, several embodiments of the present invention are shown in an exemplary rather than restrictive manner, and the same or corresponding reference numerals represent the same or corresponding parts, where: Figure 1 is a side view schematic diagram of the present invention; Figure 2 is a front view schematic diagram of the present invention; Explanation of the reference numerals in the drawings: 1. Standard ground, 2. Isolation groove, 3. Support insulator, 4. Insulating sleeve, 5. Conductive rod insulating sleeve, 6. Conductive rod, 7. Resistance wire lead-out wire, 10. Solid heat storage body, 11. Heat preservation housing, 12. Heat storage body insulation foundation, 13. Heat exchanger, 14. Circulating fan, 15. Return air duct, 16. High-temperature area, 17. Low-temperature area, 21. Air-cooled radiator, 22. Heat dissipation fan, 23. High-temperature air duct, 24. Low-temperature return air duct, 25. Insulation and heat insulation cover, 26. Temperature sensor inside the cover. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0014] Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided so that the present disclosure can be more thoroughly understood and the scope of the present disclosure can be fully conveyed to those skilled in the art. Unless otherwise specified, the technical means used in the embodiments are conventional means well known to those skilled in the art.

[0015] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in the present invention should have the ordinary meaning understood by those skilled in the art to which the present invention pertains. In this document, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Terms such as "connected" and "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. The term "comprising", "including" or any other variation thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device. Without further limitation, the elements defined by the statement "comprising..." do not exclude the presence of additional identical elements in the process, method, article or device comprising the said elements.

[0016] The temperature reduction structure of a high-temperature wall-piercing bushing in this embodiment is as Figure 1 and Figure 2As shown in the figure, isolation grooves 2, air-cooled heat dissipation devices, and insulation and heat insulation covers 25 are provided on both sides of the heat preservation shell 11 of the solid electric heat storage boiler; among them, the isolation groove 2 is arranged below the horizontal axis of the high-temperature wall-piercing bushing passing through the heat preservation shell 11, and is an air insulation interval established for the high-temperature wall-piercing bushing with an installation height not exceeding the height of the heat storage body insulation foundation 12. It is composed of a concrete building component with a heat insulation layer installed below the standard ground 1. The isolation groove 2 is a pentahedron with an open upper end face, which can be assembled in a plate form on site or poured with concrete; the air-cooled heat dissipation device is composed of an air-cooled radiator 21, a heat dissipation fan 22, a high-temperature air duct 23, a low-temperature return air duct 24, and a temperature sensor 26 inside the cover, and is a cooling circulation system that can control the ambient temperature of the conductive rod insulating sleeve 5; the insulation and heat insulation cover 25 is arranged in the low-temperature closed area, covers the periphery of the conductive rod insulating sleeve 5, establishes a low-temperature environment for the conductive rod insulating sleeve 5, and is a door-shaped component made of heat-resistant and heat-insulating materials connected to the heat preservation shell 11; the air-cooled radiator 21 is a metal plate heat exchanger with one end connected to the inside of the insulation and heat insulation cover 25 in the low-temperature area 17 through the high-temperature air duct 23 passing through the heat preservation shell 11 and above the upper end of the conductive rod insulating sleeve 5, and the other end connected to the heat dissipation fan 22; the heat dissipation fan 22 has one end connected to the air-cooled radiator 21 arranged outside the heat preservation shell 11, and the other end connected to the heat preservation shell 11 inside the insulation and heat insulation cover 25 below the lower end of the conductive rod insulating sleeve 5 through the low-temperature return air duct 24, and the air outlet of the low-temperature return air duct 24 is directed to the circulating air driver of the conductive rod insulating sleeve 5; the temperature sensor 26 inside the cover is fixed on the heat preservation shell 11 and is a temperature measuring probe with the front end inserted into the inside of the insulation and heat insulation cover 25; the high-temperature wall-piercing bushing is an electrical connection device that can introduce a 10kV - 110kV power supply into the solid electric heat storage boiler, composed of a support insulator 3, an insulating sleeve 4, a conductive rod insulating sleeve 5, a conductive rod 6, and a resistance wire lead-out wire 7; among them, the solid electric heat storage boiler is a solid electric heat storage device composed of a solid heat storage body 10, a heat preservation shell 11, a heat storage body insulation foundation 12, a heat exchanger 13, a circulating fan 14, a return air channel 15, a high-temperature area 16, and a low-temperature area 17, which can convert electric energy into storable heat energy and output the heat energy in the form of heat media such as hot water, steam, hot air, and heat-conducting oil.

[0017] The temperature of the solid heat storage body 10 of the electric heat storage furnace equipment can reach over 800°C. When in the heat release working state, the hot air in the high-temperature zone 16 flows through the heat exchanger 13 for heat exchange. The cooled low-temperature air flows back to the low-temperature zone 17 through the circulation fan 14, the return air passage 15, and the heat storage body insulation base 12. The resistance wire lead-out wire 7, the conducting rod 6, and the conducting rod insulating sleeve 5 are all in the low-temperature zone 17. At this time, the temperature in the low-temperature zone 17 is lower than 550°C, and the horizontal height of the central axes of the conducting rod 6 and the conducting rod insulating sleeve 5 is not higher than the height of the heat storage body insulation base 12, always in the low-temperature return air field, that is, always in a low-temperature state. When the equipment is in a non-heat release working state, it can be cooled by an external heat dissipation device, that is, start the heat dissipation fan 22. The hot air in the insulation and heat insulation cover 25 area enters the air-cooled radiator 21 through the air duct 23. The cooled low-temperature air is driven by the heat dissipation fan 22 and then enters the insulation and heat insulation cover 25 area through the low-temperature return air duct 24. And the end outlet of the low-temperature return air duct 24 is set in the form of a 90° bend, and the low-temperature air outlet faces upward directly to the area of the conducting rod 6 and the conducting rod insulating sleeve 5, thereby reducing the temperature at the position of the conducting rod 6 and the conducting rod insulating sleeve 5. At the same time, a temperature sensor 26 inside the cover is arranged in the insulation and heat insulation cover 25 area. When the temperature in the area is lower than the set safe temperature value, the control system controls the heat dissipation fan 22 to stop working, which can also effectively reduce the heat dissipation loss.

[0018] Describe working condition 1: The working condition with heat release output during the heat storage process. For the high-voltage solid electric heat storage furnace built on the standard ground 1, the high-voltage power supply passes through the conducting rod 6 arranged in the conducting rod insulating sleeve 5, and through the resistance wire lead-out wire 7, the solid heat storage body 10 arranged on the heat storage body insulation base 12 is heated by the resistance wire. After the heat storage reaches the rated upper limit temperature (800°C - 900°C), the heating is stopped. At this time, the solid heat storage body 10 is in a high-temperature full heat storage state. The user can, according to the heat energy demand, use the circulation fan 14 configured in the equipment to send the hot air in the solid heat storage body 10 into the heat exchanger 13 through the high-temperature zone 16 for heat energy release output. The hot air cooled by the heat exchanger 13 is sent into the area of the heat storage body insulation base 12, the lower support structure of the solid heat storage body 10, through the return air passage 15 connected to the circulation fan 14. The cooled hot air is sent into the low-temperature zone 17 and can be directly blown into the insulation and heat insulation cover 25 arranged in the low-temperature zone 17, thereby cooling the conducting rod insulating sleeve 5 in the insulation and heat insulation cover 25. In this working condition, heat storage and heat release exist simultaneously, and the circulation fan 14 is always in a working state, making the heat storage body insulation base 12 and the conducting rod insulating sleeve 5 both work in the cooled air, ensuring that each insulation component of the equipment works in a lower environment and ensuring its working reliability and safety.

[0019] Description of Working Condition 2: The working condition where there is no heat release output during the heat storage process. The heat storage process is the same as above, but the heat release stops, that is, the circulation fan 14 stops working. In this working condition, the ambient temperature inside the heat preservation housing 11 will not be lower than 800 °C. In such a working condition, the dielectric property of the pole insulator sleeve 5 in the insulating heat insulation cover 25 in the low-temperature area 17 of the equipment will decrease, which may lead to high-voltage breakdown damage. Therefore, the structure proposed in this technology can completely solve such problems. First, the temperature sensor 26 inside the cover 25 detects the ambient temperature inside the insulating heat insulation cover 25. When the ambient temperature of the pole insulator sleeve 5 exceeds 650 °C, the heat dissipation fan 22 is started. The hot air inside is led to the air-cooled radiator 21 through the high-temperature air duct 23 on the upper end of the heat preservation housing 11 inside the insulating heat insulation cover 25 for heat dissipation, and then the cooled air is sent into the lower port of the insulating heat insulation cover 25 through the low-temperature return air duct 24 to form convective air inside, reducing the internal ambient temperature and ensuring that the working ambient temperature of the pole insulator sleeve 5 arranged inside the insulating heat insulation cover 25 does not exceed 650 °C, thereby ensuring the reliability and safety of the work. This device is also suitable for Working Condition 1. When the ambient temperature inside the insulating heat insulation cover 25 is higher than 650 °C during the operation of the circulation fan 14, the heat dissipation fan 22 is also started at this time for internal cooling to ensure the safe and reliable operation of the pole insulator sleeve 5 inside. At the same time, when the temperature sensor 26 inside the insulating heat insulation cover 25 detects that the temperature is lower than the set safe temperature value, the control system controls the heat dissipation fan 22 to stop working, which can also effectively reduce the heat dissipation loss.

[0020] Through the above settings, it can effectively ensure that the conductive rod 6 and the conductive rod insulator sleeve 5 are always in a low-temperature state, thereby ensuring the insulation strength of the insulating components and effectively preventing the discharge breakdown accident under high-temperature conditions.

[0021] The above is only the specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention can easily think of changes or substitutions, which should all be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims

1. A cooling structure for a high-temperature wall bushing, comprising a solid electric heat storage boiler, the solid electric heat storage boiler being provided with a heat-insulating shell (11) outside, characterized in that: A low-temperature zone (17) is formed between the heat-insulating shell (11) and the solid electric heat-storage boiler, the solid electric heat-storage boiler is connected to the low-temperature zone (17) via a return air passage (15), and a high-temperature wall-penetrating bushing electrically connected to the solid electric heat-storage boiler is provided on the heat-insulating shell (11), and the cooling structure of the high-temperature wall-penetrating bushing further includes isolation grooves (2) provided on both sides of the heat-insulating shell (11) of the solid electric heat-storage boiler, an air-cooling heat dissipation device, and an insulating heat-insulating cover (25); The isolation groove (2) is arranged below the horizontal axis of the high-temperature wall bushing penetrating the thermal insulation shell (11), and is composed of a concrete building component with a thermal insulation layer installed below the standard ground (1); The insulating heat-insulating cover (25) is arranged in the low-temperature zone (17) and covers the outside of the high-temperature wall bushing. It is a door-shaped component made of heat-resistant and heat-insulating material and is connected to the heat-insulating shell (11) to establish a low-temperature environment for the high-temperature wall bushing. The insulating heat-insulating cover (25) and the heat-insulating shell (11) form a heat-insulating zone. The air-cooled heat dissipation device is connected to the insulation zone formed by the insulating heat insulation cover (25) and the heat preservation shell (11) through the air inlet and the return air outlet, and is a cooling circulation device capable of controlling the ambient temperature of the high-temperature wall bushing, wherein the air inlet is arranged above the horizontal line of the high-temperature wall bushing, and the return air outlet is arranged below the horizontal line of the high-temperature wall bushing.

2. A cooling structure for a high-temperature wall bushing according to claim 1, characterized in that: The air-cooled heat dissipation device comprises an air-cooled radiator (21), a heat dissipation fan (22), a high-temperature air induced duct (23) and a low-temperature return air duct (24). The air-cooled radiator (21) is a metal plate heat exchanger having one end connected to the heat-insulating shell (11) inside the insulating heat-insulating cover (25) and higher than the upper end of the high-temperature wall-penetrating sleeve through the high-temperature air induced duct (23) penetrating the heat-insulating shell (11), and the other end connected to the heat dissipation fan (22). The other end of the heat dissipation fan (22) is connected to the heat-insulating shell (11) inside the insulating heat-insulating cover (25) and lower than the lower end of the high-temperature wall-penetrating sleeve through the low-temperature return air duct (24), and the air outlet of the low-temperature return air duct (24) points to the high-temperature wall-penetrating sleeve.

3. A cooling structure for a high-temperature wall bushing according to claim 2, characterized in that: The air-cooled heat dissipation device also includes an in-hood temperature sensor (26) fixed on the heat-insulating shell (11), and a temperature measuring end is inserted into the interior of the insulating heat-insulating hood (25).

4. A cooling structure for a high-temperature wall bushing according to claim 1, characterized in that: The bottom of the isolation groove (2) is 0.5-2.5 meters away from the horizontal axis of the high-temperature wall bushing.

5. The cooling structure of a high-temperature wall bushing according to claim 1, characterized in that: The high-temperature wall bushing is an electrical connection device that is composed of a support insulator (3), an insulating bushing (4), a conductive rod insulating sleeve (5), a conductive rod (6), and a resistance wire lead-out line (7), and is capable of introducing a 10 kV to 110 kV power supply into a solid electric heat storage boiler. The conductive rod (6) passes through a heat-insulating shell (11) and is connected to the solid electric heat storage boiler via the resistance wire lead-out line (7). The conductive rod insulating sleeve (5) is sleeved outside the conductive rod (6). The insulating bushing (4) is sleeved on a side of the conductive rod insulating sleeve (5) located outside the heat-insulating shell (11), and is supported in the isolation slot (2) via the support insulator (3).

6. A cooling structure for a high-temperature wall bushing according to claim 1, characterized in that: The solid electric heat storage boiler is a solid electric heat storage device which is composed of a solid heat storage body (10), a heat insulation shell (11), a heat storage body insulation foundation (12), a heat exchanger (13), a circulating fan (14), a return air duct (15), and a high temperature zone (16). The solid electric heat storage device can convert electric energy into storable thermal energy and output the thermal energy in the form of a heat medium such as hot water, steam, hot air, and heat transfer oil. The solid heat storage body (10), the heat exchanger (13), and the circulating fan (14) are connected in sequence. The solid heat storage body (10) is supported on a standard ground (1) by a plurality of heat storage body insulation foundations (12). A high temperature zone (16) is formed between the solid heat storage body (10) and the heat exchanger (13). The circulating fan (14) is connected to the low temperature zone (17) through the return air duct (15).

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