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 utility model relates to solid electric heat accumulation furnace high voltage power supply connection technology field, concretely is a kind of cooling structure of high-temperature wall bushing. BACKGROUND

[0002] At present, in some solid electric heat accumulation boiler high-temperature high-pressure steam output project, when 700 DEG C solid heat accumulator arranged in traditional solid electric heat accumulation furnace is used to release heat, the temperature gradient available to heat accumulator will be smaller, especially when steam output temperature reaches 500 DEG C or more, the circulating effective heat release temperature gradient of heat accumulator is less than 150 DEG C, only by increasing the upper limit of solid heat accumulator temperature to increase the heat release temperature difference of solid heat accumulator, the heat storage capacity of solid heat accumulator can be improved.But, by increasing the upper limit of solid heat accumulator temperature, the temperature of each part in solid electric heat accumulation furnace will be increased, when the heat storage temperature in the heat preservation shell of solid electric heat accumulation furnace reaches 800 DEG C or more, the ambient temperature of high-temperature wall bushing installed in low-temperature area for connecting 10kV~110kV power supply may exceed the upper limit of working temperature that 720 DEG C high-temperature wall bushing can withstand, which will accelerate the aging of high-temperature wall bushing and shorten the service life of high-voltage wall bushing.How to solve the problem of how to establish a working environment below 700 DEG C for the installation part of high-temperature wall bushing in solid electric heat accumulation furnace when the working temperature of solid heat accumulator is 800 DEG C or more, so that the high-temperature wall bushing can work safely and reliably, and the heat storage energy of heat accumulator can be effectively improved, and the comprehensive economic value of electric heat accumulation furnace can be improved.

[0003] Therefore, aiming at the above technical problems, the utility model provides a kind of cooling structure of high-temperature wall bushing. SUMMARY

[0004] In view of the above technical needs, the utility model aims at providing a kind of cooling structure of high-temperature wall bushing, to solve the problem of how to ensure the insulation strength of high-temperature wall bushing of 10kV~110kV high-voltage power supply connection when the heat storage temperature of solid electric heat accumulation boiler is 800 DEG C or more, and then prevent discharge breakdown failure and cause solid electric heat accumulation equipment to stop.

[0005] In order to achieve the above purpose, the utility model takes the following technical scheme:

[0006] The utility model provides a kind of cooling structure of high-temperature wall bushing, including solid electric heat accumulation boiler, solid electric heat accumulation boiler is equipped with heat preservation shell, low-temperature area is formed between heat preservation shell and solid electric heat accumulation boiler, high-temperature wall bushing is connected to low-temperature area by return air passage, and heat preservation shell is equipped with high-temperature wall bushing, and the cooling structure of high-temperature wall bushing further includes the isolation groove being arranged in the both sides of the heat preservation shell of solid electric heat accumulation boiler, air cooling heat sink, insulation temperature shield;

[0007] The isolation groove is located below the horizontal axis of the high-temperature through-wall sleeve that penetrates the insulation shell, and is composed of a concrete building component with a heat insulation layer installed below the ground.

[0008] An insulating heat insulation cover is installed in the low-temperature zone and covers the high-temperature through-wall bushing. It is a door-shaped component made of heat-resistant and heat-insulating material that establishes a low-temperature environment for the high-temperature through-wall bushing and connects with the heat insulation shell. The insulating heat insulation cover and the heat insulation shell form an insulation zone.

[0009] The air-cooled heat dissipation device is connected to the insulation zone formed by the insulating cover and the insulation shell through the air intake and return air inlets. It is a cooling circulation device that can control the ambient temperature of the high-temperature through-wall bushing. The air intake is set above the horizontal line of the high-temperature through-wall bushing, and the return air inlet is set below the horizontal line of the high-temperature through-wall bushing.

[0010] Furthermore, the air-cooled heat dissipation device includes an air-cooled radiator, a heat dissipation fan, a high-temperature exhaust duct, and a low-temperature return duct. The air-cooled radiator is a metal plate heat exchanger with one end connected to the insulation shell inside the insulation cover (which is higher than the upper end of the high-temperature through-wall sleeve) via a high-temperature exhaust duct that penetrates through the insulation shell, and the other end connected to the heat dissipation fan. The other end of the heat dissipation fan is connected to the insulation shell inside the insulation cover (which is lower than the lower end of the high-temperature through-wall sleeve) via a low-temperature return duct, and the air outlet of the low-temperature return duct points towards the high-temperature through-wall sleeve.

[0011] Furthermore, the air-cooled heat dissipation device also includes an internal temperature sensor, which is fixed on the heat insulation shell and the temperature measuring end is inserted into the inside of the insulating heat insulation cover.

[0012] Furthermore, the bottom of the isolation groove is 0.5-2.5 meters away from the horizontal axis of the high-temperature through-wall sleeve.

[0013] Furthermore, the high-temperature through-wall bushing is an electrical connection device composed of a supporting insulator, an insulating sleeve, a conductive rod insulating sleeve, a conductive rod, and a resistance wire lead-out wire, which can introduce 10kV to 110kV power into the solid electric thermal storage boiler. The conductive rod passes through the insulation shell and is connected to the solid electric thermal storage boiler through the resistance wire. The conductive rod insulating sleeve is fitted outside the conductive rod, and the insulating sleeve is fitted on the side of the conductive rod insulating sleeve located outside the insulation shell, and is supported in the isolation groove by the supporting insulator.

[0014] Furthermore, the solid-state electric thermal storage boiler is a solid-state electric thermal storage device that can convert electrical energy into storable thermal energy and output the thermal energy in the form of hot water, steam, hot air, thermal oil, etc., consisting of a solid thermal storage body, an insulated shell, an insulated foundation for the thermal storage body, a heat exchanger, a circulating fan, a return air duct, a high-temperature zone, and a low-temperature zone. The solid thermal storage body, the heat exchanger, and the circulating fan are connected in sequence. The solid thermal storage body is supported on the ground by multiple insulated foundations for the thermal storage body. A high-temperature zone is formed between the solid thermal storage body and the heat exchanger. The circulating fan is connected to the low-temperature zone through the return air duct.

[0015] The technical solution adopted in this utility model has the following advantages:

[0016] By setting up an isolation groove below the location of the high-temperature through-wall bushing in the original solid-state electric thermal storage boiler, the discharge safety distance required for the lowered installation of the high-temperature through-wall bushing is met. This allows the high-voltage power supply line's high-temperature through-wall bushing to be installed within a height of 300mm to 1200mm above the ground. This enables the circulating fan to return the low-temperature hot air (below 550℃) from the thermal storage body's insulating foundation through the return air channel. The hot air then smoothly enters the doorway-shaped component enclosed by the insulating cover to cool the conductive rod's insulating sleeve. When the circulating fan is stopped or running at low air volume, if the low-temperature hot air (below 550℃) returning from the thermal storage body's insulating foundation cannot lower the ambient temperature of the conductive rod's insulating sleeve to below 650℃, the air-cooling device can be activated to lower the ambient temperature of the conductive rod's insulating sleeve to below 650℃. This ensures that the portion of the conductive rod's insulating sleeve inside the electric thermal storage furnace is within a low-temperature air field, preventing accidents such as reduced withstand voltage insulation strength, shortened service life, or even voltage breakdown caused by the ambient temperature of the conductive rod's insulating sleeve exceeding 720℃. This invention solves the insulation strength problem of electrical materials in high-temperature environments by employing an easily implemented installation structure method. It addresses both cost-effectiveness and electrical safety. This method avoids accidents caused by excessive ambient temperature of the conductive rod's insulating sleeve, which could lead to reduced withstand voltage insulation strength, shortened service life, or even voltage breakdown. Attached Figure Description

[0017] The above and other objects, features, and advantages of the present invention will become readily understood by reading the following detailed description of exemplary embodiments with reference to the accompanying drawings. In the drawings, several embodiments of the present invention are shown by way of example and not limitation, with the same or corresponding reference numerals denoteing the same or corresponding parts, wherein:

[0018] Figure 1 This is a side view of the present invention;

[0019] Figure 2 This is a front view schematic diagram of this utility model;

[0020] Explanation of icon numbers:

[0021] 1. Ground, 2. Isolation trench, 3. Supporting insulator, 4. Insulating sleeve, 5. Conductive rod insulating sleeve, 6. Conductive rod, 7. Resistance wire lead-out, 10. Solid heat storage body, 11. Insulation shell, 12. Heat storage body insulating foundation, 13. Heat exchanger, 14. Circulating fan, 15. Return air duct, 16. High temperature zone, 17. Low temperature zone, 21. Air-cooled radiator, 22. Cooling fan, 23. High temperature exhaust duct, 24. Low temperature return air duct, 25. Insulating heat insulation cover, 26. Temperature sensor inside the cover. Detailed Implementation

[0022] Exemplary embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art. Unless otherwise specified, the techniques used in the embodiments are conventional means well known to those skilled in the art.

[0023] It should be noted that, unless otherwise stated, the technical or scientific terms used in this invention should be understood in their ordinary sense by those skilled in the art to which this invention pertains. In this document, relational terms such as “first” and “second” are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. The terms “connection”, “linked,” etc., should be interpreted broadly, for example, referring to a fixed connection, a detachable connection, or an integral connection; a mechanical connection or an electrical connection; a direct connection or an indirect connection via an intermediate medium. The terms “comprising,” “including,” or any other variations thereof are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase “comprising…” does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0024] This embodiment describes a cooling structure for a high-temperature through-wall bushing, such as... Figure 1 and Figure 2As shown, an isolation groove 2, an air-cooled heat dissipation device, and an insulating heat insulation cover 25 are provided on both sides of the insulation shell 11 of the solid electric thermal storage boiler. The isolation groove 2, located below the horizontal axis of the high-temperature through-wall sleeve penetrating the insulation shell 11, is an air-insulated gap established for the high-temperature through-wall sleeve whose installation height does not exceed the height of the thermal storage body's insulating foundation 12. It is composed of a concrete building component with an insulating layer installed below the ground 1. The isolation groove 2 is a pentahedron with an open upper end face, which can be assembled on-site as a plate or cast in concrete. The air-cooled heat dissipation device consists of an air-cooled radiator 21. The system comprises a cooling fan 22, a high-temperature exhaust duct 23, a low-temperature return duct 24, and an internal temperature sensor 26, forming a cooling circulation system capable of controlling the ambient temperature of the conductive rod insulating sleeve 5. An insulating cover 25, installed within the low-temperature enclosed area, surrounds the conductive rod insulating sleeve 5 to create a low-temperature environment and connects to the insulation shell 11; it is a door-shaped component made of heat-resistant and heat-insulating material. The air-cooled radiator 21 is connected at one end to the inner side of the insulating cover 25 in the low-temperature zone 17 via the high-temperature exhaust duct 23 penetrating the insulation shell 11, and is higher than the conductive rod insulating sleeve 5. A metal plate heat exchanger is connected to the insulation shell 11 at one end and to the heat dissipation fan 22 at the other end; the heat dissipation fan 22 is connected at one end to the air-cooled radiator 21 located outside the insulation shell 11, and at the other end to the insulation shell 11 inside the insulation cover 25, below the lower end of the conductive rod insulating sleeve 5, through a low-temperature return air pipe 24, and the air outlet of the low-temperature return air pipe 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 insulation shell 11 and is a temperature probe with its front end inserted inside the insulation cover 25; the high-temperature through-wall sleeve is made of The electrical connection device, consisting of supporting insulator 3, insulating sleeve 4, conductive rod insulating sleeve 5, conductive rod 6, and resistance wire lead-out wire 7, is capable of introducing 10kV to 110kV power supply into the solid electric thermal storage boiler; wherein the solid electric thermal storage boiler is a solid electric thermal storage device consisting of solid thermal storage body 10, heat insulation shell 11, thermal storage body insulating foundation 12, heat exchanger 13, circulating fan 14, return air channel 15, high temperature zone 16, and low temperature zone 17, which can convert electrical energy into storable thermal energy and output the thermal energy in the form of heat mediums such as hot water, steam, hot air, and heat transfer oil.

[0025] The solid heat storage body 10 of the electric thermal storage furnace can reach a temperature of over 800℃. During heat release operation, the hot air in the high-temperature zone 16 flows through the heat exchanger 13 for heat exchange. The cooled air then flows back to the low-temperature zone 17 through the circulating fan 14, return air channel 15, and the heat storage body insulation base 12. The resistance wire lead 7, conductive rod 6, and conductive rod insulation sleeve 5 are all located in the low-temperature zone 17, where the temperature is below 550℃. Furthermore, the horizontal height of the central axis of the conductive rod 6 and conductive rod insulation sleeve 5 is not higher than the height of the heat storage body insulation base 12, ensuring they remain in the low-temperature return air field and are always in a low-temperature state. When the equipment is not in heat release operation, heat can be dissipated through an external heat dissipation device. The system activates the cooling fan 22, drawing hot air from the insulation cover 25 area into the air-cooled radiator 21 through the air duct 23. The cooled air, driven by the cooling fan 22, then enters the insulation cover 25 area through the low-temperature return air duct 24. The outlet of the low-temperature return air duct 24 is set at a 90° bend, with the low-temperature air outlet facing upwards towards the area of ​​the conductive rod 6 and the conductive rod insulation sleeve 5, thereby reducing the temperature at the locations of the conductive rod 6 and the conductive rod insulation sleeve 5. Simultaneously, an internal temperature sensor 26 is installed within the insulation cover 25 area. When the temperature in the area falls below the set safe temperature value, the control system stops the cooling fan 22, which also effectively reduces heat loss.

[0026] Operating Condition 1: During the heat storage process, heat is released. A high-voltage solid-state electric thermal storage furnace, built on ground level 1, is powered by a high-voltage power supply. Through a conductive rod 6 housed in the insulating sleeve 5, and via a resistance wire lead-out line 7, the high-voltage power supply heats the solid thermal storage body 10, which is mounted on the insulating foundation 12 of the storage body, via a resistance wire. Heating is stopped once the rated upper limit temperature (800℃~900℃) is reached. At this point, the solid thermal storage body 10 is in a high-temperature, fully stored state. The user can then use the circulating fan 14 configured in the equipment to circulate the hot air from the solid thermal storage body 10 through the high-temperature zone 16 into the heat exchanger 13 to release the heat energy, according to the user's heat energy requirements. The hot air, cooled by the heat exchanger 13, is sent through the return air duct 15 connected to the circulating fan 14 into the area of ​​the heat storage body insulation base 12, the lower support structure of the solid heat storage body 10. This cooled hot air is then sent into the low-temperature zone 17 and can be directly blown into the insulation cover 25 located in the low-temperature zone 17, thereby cooling the conductive rod insulation sleeve 5 within the insulation cover 25. Under this operating condition, heat storage and heat release occur simultaneously. The circulating fan 14 is constantly operating, ensuring that the heat storage body insulation base 12 and the conductive rod insulation sleeve 5 operate in cooled air, guaranteeing that all insulating components of the equipment operate in a low-temperature environment, thus ensuring its reliability and safety.

[0027] Description of operating condition two: The heat storage process is the same as above, but heat release stops, i.e., the circulating fan 14 stops working. Under this condition, the ambient temperature inside the insulation shell 11 will not be lower than 800℃. In this situation, the dielectric properties of the insulating sleeve 5 of the electric pole inside the insulation cover 25 in the low-temperature zone 17 of the equipment will decrease, potentially leading to high-voltage breakdown. Therefore, the structure proposed in this technology can completely solve this problem. First, the temperature sensor 26 inside the insulation cover 25 detects the ambient temperature inside the insulation cover 25. When the ambient temperature of the pole insulation sleeve 5 exceeds 650℃, the cooling fan 22 is activated. The hot air inside the insulation cover 25 is drawn to the air-cooled radiator 21 through the high-temperature air duct 23 on the upper insulation shell 11 for cooling. The cooled air is then sent to the lower port of the insulation cover 25 through the low-temperature return air duct 24, creating convection airflow and lowering the internal ambient temperature. This ensures that the operating ambient temperature of the pole insulation sleeve 5 inside the insulation cover 25 does not exceed 650℃, thus guaranteeing operational reliability and safety. This device is also suitable for condition one: when the ambient temperature inside the insulation cover 25 exceeds 650℃ with the circulating fan 14 operating, the cooling fan 22 is activated again to cool the interior, ensuring the safe and reliable operation of the pole insulation sleeve 5. Simultaneously, when the temperature sensor 26 inside the insulation cover 25 detects a temperature below the set safe temperature value, the control system stops the cooling fan 22, effectively reducing heat loss.

[0028] The above settings effectively ensure that the conductive rod 6 and the conductive rod insulating sleeve 5 are always kept at a low temperature, thereby ensuring the insulation strength of the insulating components and effectively preventing discharge breakdown accidents under high temperature conditions.

[0029] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope of the claims.

Claims

1. A cooling structure for a high-temperature through-wall bushing, comprising a solid-state electric thermal storage boiler, wherein the solid-state electric thermal storage boiler is provided with an insulated shell (11), characterized in that, A low-temperature zone (17) is formed between the insulation shell (11) and the solid electric thermal storage boiler. The solid electric thermal storage boiler is connected to the low-temperature zone (17) through the return air channel (15). The insulation shell (11) is provided with a high-temperature through-wall sleeve that is electrically connected to the solid electric thermal storage boiler. The cooling structure of the high-temperature through-wall sleeve also includes an isolation groove (2) set on both sides of the insulation shell (11) of the solid electric thermal storage boiler, an air-cooled heat dissipation device, and an insulating heat insulation cover (25). The isolation groove (2) is located below the horizontal axis of the high-temperature through-wall sleeve that penetrates the insulation shell (11), and is made of a concrete building component with a heat insulation layer installed under the ground (1). The insulating heat insulation cover (25) is set in the low temperature zone (17) and covered outside the high temperature through-wall sleeve. It is a door-shaped component made of heat-resistant and heat-insulating material to establish a low temperature environment for the high temperature through-wall sleeve and connect with the heat insulation shell (11). The insulating heat insulation cover (25) and the heat insulation shell (11) form a heat insulation zone. The air-cooled heat dissipation device is connected to the insulation zone formed by the insulating heat insulation cover (25) and the heat insulation shell (11) through the air intake and return air intake. It is a cooling circulation device that can control the ambient temperature of the high-temperature through-wall bushing. The air intake is set above the horizontal line of the high-temperature through-wall bushing, and the return air intake is set below the horizontal line of the high-temperature through-wall bushing.

2. The cooling structure for a high-temperature through-wall sleeve according to claim 1, characterized in that, The air-cooled heat dissipation device includes an air-cooled radiator (21), a heat dissipation fan (22), a high-temperature air intake duct (23), and a low-temperature return air duct (24). The air-cooled radiator (21) is a metal plate heat exchanger with one end connected to the heat insulation shell (11) inside the insulation cover (25) above the upper end of the high-temperature through-wall sleeve through the high-temperature air intake duct (23) that penetrates the insulation 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 insulation shell (11) inside the insulation cover (25) below the lower end of the high-temperature through-wall 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 through-wall sleeve.

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

4. The cooling structure for a high-temperature through-wall sleeve 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 through-wall sleeve.

5. The cooling structure for a high-temperature through-wall sleeve according to claim 1, characterized in that, The high-temperature through-wall bushing is an electrical connection device that can introduce 10kV to 110kV power into a solid electric thermal storage boiler, consisting of a supporting insulator (3), an insulating sleeve (4), a conductive rod insulating sleeve (5), a conductive rod (6), and a resistance wire lead (7). The conductive rod (6) passes through the insulation shell (11) and is connected to the solid electric thermal storage boiler through the resistance wire lead (7). The conductive rod insulating sleeve (5) is fitted outside the conductive rod (6), and the insulating sleeve (4) is fitted on the side of the conductive rod insulating sleeve (5) located outside the insulation shell (11), and is supported in the isolation groove (2) by the supporting insulator (3).

6. The cooling structure for a high-temperature through-wall bushing according to claim 1, characterized in that, The solid-state electric thermal storage boiler is a solid-state electric thermal storage device consisting of a solid thermal storage body (10), an insulated shell (11), a thermal storage body insulation base (12), a heat exchanger (13), a circulating fan (14), a return air channel (15), and a high-temperature zone (16). It can convert electrical energy into storable thermal energy and output the thermal energy in the form of hot water, steam, hot air, or thermal oil. The solid thermal storage body (10), the heat exchanger (13), and the circulating fan (14) are connected in sequence. The solid thermal storage body (10) is supported on the ground (1) by multiple thermal storage body insulation bases (12). A high-temperature zone (16) is formed between the solid thermal storage body (10) and the heat exchanger (13). The circulating fan (14) is connected to the low-temperature zone (17) through the return air channel (15).

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