An electric heating device and rto furnace

Abstract

The utility model provides a kind of electric heating device and RTO furnace, it is related to organic waste gas technical field.The electric heating device includes fixed unit and electric heating unit.Electric heating unit includes at least one layer electric heating component, and each layer electric heating component includes at least two electric heating components.Each electric heating component includes ceramic rod, electric heating wire and two electrodes.Ceramic rod is fixed on fixed unit.Electric heating wire is wound on ceramic rod.Two outgoing ends of electric heating wire are connected with two electrodes respectively, to form an independent current path on each electric heating component.In the electric heating device provided by the utility model, each electric heating component is independent of each other.When the electric heating wire of certain electric heating component is damaged or broken, only the damaged electric heating component needs to be replaced, thereby avoiding the problem that the overall equipment is disabled due to local failure in the traditional structure, effectively improving the maintainability of the equipment and reducing the maintenance cost.

Description

Technical Field

[0001] This utility model relates to the field of organic waste gas technology, and more specifically, to an electric heating device and an RTO furnace. Background Technology

[0002] In an RTO (Regenerative Thermal Oxidizer) system, the electric heating device is a key component for starting or assisting heating, and its performance directly affects the operating efficiency and stability of the entire system.

[0003] However, in existing electric heating devices, the heating wire is mostly a one-piece design, meaning the entire heating element is a single structure. When local damage occurs during heating, such as a section of the resistance wire breaking due to localized overheating or mechanical stress, the entire electric heating device usually needs to be replaced. This makes partial repair or replacement impossible, leading to extended equipment maintenance cycles and increased maintenance costs. Utility Model Content

[0004] In related technologies, the heating wires of electric heating devices are mostly integrated structures, requiring replacement of the entire device when a part is damaged, resulting in long maintenance cycles and high costs.

[0005] To address this issue, this utility model provides an electric heating device and an RTO furnace. The electric heating device includes a fixed unit and an electric heating unit. The electric heating unit includes at least one layer of electric heating components, and each layer includes at least two electric heating elements. Each electric heating element includes a ceramic rod, a heating wire, and two electrodes. The ceramic rod is fixed to the fixed unit. The heating wire is wound around the ceramic rod. The two leads of the heating wire are connected to the two electrodes respectively, thus forming an independent current path on each electric heating element. Based on the above structural design, the electric heating components in the electric heating device provided by this utility model are independent of each other. When the heating wire of one of the electric heating elements is damaged or broken, only the damaged heating element needs to be replaced, without replacing the entire electric heating device. This avoids the problem of overall equipment downtime due to local failures in traditional structures, effectively improving the maintainability of the equipment and reducing maintenance costs. Attached Figure Description

[0006] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0007] Figure 1This is a schematic diagram of the structure of the electric heating device provided in this embodiment; Figure 2 This is a schematic diagram of the structure of the single-layer electric heating assembly provided in this embodiment; Figure 3 This is another structural schematic diagram of the single-layer electric heating assembly provided in this embodiment; Figure 4 This is a schematic diagram of the structure of the first positioning plate provided in this embodiment; Figure 5 This is a schematic diagram of the structure of the second positioning plate provided in this embodiment; Figure 6 This is a schematic diagram of the structure of the multilayer electric heating assembly provided in this embodiment; Figure 7 This is a schematic diagram of the RTO furnace provided in this embodiment.

[0008] Icons: 1-RTO furnace; 10-electric heating device; 30-furnace body; 100-fixing unit; 110-inner frame; 130-outer frame; 150-first positioning plate; 151-first positioning hole; 170-second positioning plate; 171-second positioning hole; 200-electric heating unit; 210-electric heating assembly; 230-electric heating component; 231-ceramic rod; 2311-first rod section; 2313-second rod section; 2315-third rod section; 2317-fourth rod section; 233-electric heating wire; 235-electrode; 237-insulating sleeve; 250-ventilation channel; 300-heat insulation unit; 310-connecting flange; 400-heat dissipation unit; 410-heat sink; 500-junction box; 510-handle. Detailed Implementation

[0009] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0010] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0011] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0012] In the description of this utility model, it should be noted that if terms such as "upper," "lower," "inner," or "outer" are used to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the utility model product is usually placed during use, they are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0013] Furthermore, terms such as "first" and "second" are used only for unit sub-description and should not be interpreted as indicating or implying relative importance.

[0014] It should be noted that, where there is no conflict, the features in the embodiments of this utility model can be combined with each other.

[0015] The following describes in detail the overall structure, working principle, and technical effects of the electric heating device and RTO furnace provided by this utility model through embodiments and in conjunction with the accompanying drawings.

[0016] Please see Figures 1 to 3 This utility model provides an electric heating device 10 and an RTO furnace 1 to solve the problem that existing electric heating devices 10 require complete replacement when partially damaged, thereby improving the maintainability of the equipment and reducing maintenance costs. The electric heating device 10 includes a fixing unit 100 and an electric heating unit 200. The electric heating unit 200 includes at least one layer of electric heating components 210, and each layer of electric heating components 210 includes at least two electric heating elements 230. Each electric heating element 230 includes a ceramic rod 231, an electric heating wire 233, and two electrodes 235. The ceramic rod 231 is fixed to the fixing unit 100 as a support structure. The electric heating wire 233 is wound around the ceramic rod 231 and is used to generate heat when electricity is applied, converting electrical energy into heat energy. Furthermore, the two leads of the electric heating wire 233 are respectively connected to the two electrodes 235, so that the electric heating wire 233 on each electric heating element 230 can form an independent current path.

[0017] Based on the above configuration, it can be understood that each electric heating component 230 in the electric heating device 10 provided in this application is independent of each other. When the electric heating wire 233 in a certain electric heating component 230 is damaged or broken, only the damaged electric heating component 230 can be replaced, without replacing the entire electric heating device 10. This avoids the problem of overall shutdown due to local failure in traditional structures, thereby improving the maintainability of the equipment and reducing maintenance costs.

[0018] Please refer to it again. Figure 1 To further enhance the overall safety, stability, and maintainability of the device, the electric heating device 10 also includes a heat insulation unit 300, a heat dissipation unit 400, and a junction box 500. Furthermore, each electrode 235 is fitted with an insulating sleeve 237, which is sequentially connected to the junction box 500 via the heat insulation unit 300 and the heat dissipation unit 400, thus effectively protecting the electrode 235 from mechanical damage and preventing electrical contact between the electrode 235 and surrounding equipment or personnel.

[0019] Specifically, the heat insulation unit 300 is connected to the fixing unit 100 and is located on one side of the lead-out end of the electric heating wire 233. It is used to prevent the heat generated by the electric heating wire 233 during operation from being conducted to non-working areas, thereby effectively protecting external equipment and structures from high temperatures. Optionally, the material of the heat insulation unit 300 is heat-insulating cotton with excellent heat insulation properties or other high-temperature resistant insulating materials. Furthermore, such as... Figure 1 As shown, the top of the insulation unit 300 is provided with a connecting flange 310 for structural connection and fixation with external equipment.

[0020] The heat dissipation unit 400 is disposed outside the heat insulation unit 300, and includes a metal tube sleeved on the outside of the insulating sleeve 237 and multiple heat dissipation fins 410 connected to the metal tube. The multiple heat dissipation fins 410 are arranged at intervals along the axial direction of the metal tube, forming airflow channels between adjacent heat dissipation fins 410 to promote air convection and improve heat dissipation efficiency. The function of the heat dissipation fins 410 is to increase the heat dissipation surface area, and through natural convection or external airflow assistance, to dissipate the heat conducted from the electrode 235 lead-out end to the environment in a timely manner, thereby preventing high temperatures from adversely affecting the internal electrical connection components of the junction box 500 and ensuring stable operation of the junction box 500 within the normal temperature range.

[0021] The junction box serves as the electrical connection area of ​​the electric heating device 10, used for centralized management and connection of the electrode 235 leads of each electric heating component 230, to ensure stable conduction between the electric heating wire 233 and the external power supply. Structurally, an insulating sleeve 237 is installed at the junction box's entry point to ensure electrical insulation between the electrode 235 and the metal casing of the junction box, effectively preventing short circuits or leakage risks caused by contact between the electrode 235 and the casing, thus ensuring the safety and stability of the device's operation. Optionally, a double handle 510 structure is provided on the top of the junction box, symmetrically arranged on both sides, facilitating hoisting or handling operations during installation, disassembly, or maintenance.

[0022] In some embodiments, such as Figure 2 As shown, the ceramic rod 231 includes a first rod portion 2311, a second rod portion 2313, and a third rod portion 2315. The first rod portion 2311, the second rod portion 2313, and the third rod portion 2315 are connected sequentially and together form a U-shaped structure. In this embodiment, at least two electric heating components 230 in each layer of electric heating assembly 210 are nested sequentially according to the size of the U-shaped structure, that is, the smaller U-shaped structure is located inside, and the larger U-shaped structure surrounds the outside, thereby forming a multi-layer nested structure.

[0023] Based on the above, a ventilation channel 250 is formed between two adjacent U-shaped structures. This ventilation channel 250 runs through the central area of ​​the electric heating device 10. During the operation of the RTO furnace 1, the gas heated and oxidized by the electric heating wire 233 can flow smoothly along this channel, thereby significantly reducing the flow resistance when the airflow passes through, reducing the driving force required by the fan in the RTO furnace 1, and thus reducing the operating load of the fan and improving the energy efficiency of the entire RTO system. In practical applications, even the smallest U-shaped structure is a ventilation channel 250, which will not be elaborated further here.

[0024] In other embodiments, such as Figure 3 As shown, the ceramic rod 231 includes a first rod portion 2311, a second rod portion 2313, a third rod portion 2315, and a fourth rod portion 2317. Specifically, the first rod portion 2311, the second rod portion 2313, the third rod portion 2315, and the fourth rod portion 2317 are connected sequentially to form a U-shaped structure. In this embodiment, at least two electric heating components 230 in each layer of electric heating assembly 210 are nested sequentially according to the size of the U-shaped structure, that is, the smaller U-shaped structure is located inside, and the larger U-shaped structure surrounds the outside, thereby forming a multi-layer nested structure.

[0025] Similarly, a ventilation channel 250 is formed between two adjacent U-shaped structures. This ventilation channel 250 runs through the central region of the electric heating device 10. During the operation of the RTO furnace 1, the gas heated and oxidized by the electric heating wire 233 can flow smoothly along this channel, thereby significantly reducing the flow resistance when the airflow passes through, reducing the driving force required by the fan in the RTO furnace 1, and thus reducing the operating load of the fan and improving the energy efficiency of the entire RTO system. In practical applications, even the smallest U-shaped structure is a ventilation channel 250, which will not be described in detail here.

[0026] Furthermore, it should be noted that in the structural design of this utility model, when the combustible exhaust gas passes through the ventilation channel 250, its flow path is located in the higher temperature region between the multiple electric heating components 230. Because the electric heating wire 233 generates high temperature after being energized and radiates heat to the surroundings through the ceramic rod 231, a relatively concentrated thermal field region is formed in the space between the electric heating components 230. When the exhaust gas flows through this region, it can more fully absorb heat, thereby raising its temperature to closer to the starting temperature required for the combustion reaction.

[0027] In some optional embodiments, the outer periphery of the ceramic rod 231 is provided with a spiral groove, and the electric heating wire 233 is wound along the spiral groove. In practical applications, the spiral groove is a groove structure that is evenly distributed around the circumference of the ceramic rod 231, and its cross-sectional shape can be semi-circular, rectangular, or trapezoidal, etc., and can be adapted to the design according to the diameter of the electric heating wire 233 and the winding process requirements.

[0028] By incorporating spiral grooves, the electric heating wire 233 can be wound orderly along the grooves according to predetermined spacing and number of turns, avoiding direct contact between heating wires and effectively preventing short circuits, thus improving the safety of equipment operation. Simultaneously, the spiral groove structure also helps to stably fix the heating wire on the ceramic rod 231, preventing displacement, loosening, or even detachment of the heating wire due to vibration or other reasons, further enhancing the overall structural stability and operational reliability of the electric heating component 230.

[0029] Furthermore, it should be noted that the electric heating wire 233, as an electrothermal conversion element, converts electrical energy into heat energy after being energized, generating high temperatures to heat the organic waste gas, thus promoting it to reach the reaction temperature required for oxidation and decomposition, thereby achieving efficient purification of the waste gas. In the electric heating device 10 provided in this embodiment of the present invention, the electric heating wire 233 adopts an exposed alloy resistance wire structure, which has good high-temperature resistance and electrothermal conversion efficiency, and is suitable for long-term stable operation under high-temperature conditions in the RTO furnace 1 system.

[0030] Please refer to it again. Figure 1 , Figure 4 as well as Figure 5To ensure that the electric heating device 10 provided by this utility model can provide structural support and spatial positioning for multiple electric heating components 230, and maintain good structural stability and installation accuracy under high temperature and high airflow disturbance environment, the fixing unit 100 includes an inner frame 110, an outer frame 130, a first positioning plate 150 and a second positioning plate 170.

[0031] The inner frame 110 is located inside the ceramic rod 231 with the smallest shape among the multiple electric heating components 230, serving as the internal support structure for this electric heating component 230. The outer frame 130 is located outside the ceramic rod 231 with the largest shape, providing external support and protection for the entire electric heating assembly 210, preventing structural displacement or damage caused by external environmental disturbances, thereby improving the overall stability and service life of the electric heating device 10.

[0032] Based on the above, the first positioning plate 150 is connected between the outer wall of the inner frame 110 and the inner wall of the outer frame 130, and has a first positioning hole 151 that mates with the first rod portion 2311. Similarly, the second positioning plate 170 is connected between the outer wall of the inner frame 110 and the inner wall of the outer frame 130, and has a second positioning hole 171 that mates with the third rod portion 2315.

[0033] It is understood that by providing the first positioning hole 151 and the second positioning hole 171, the first rod portion 2311 and the third rod portion 2315 of the ceramic rod 231 can be inserted into the positioning holes on the corresponding positioning plates, thereby achieving the orderly assembly and stable fixation of the multi-layer nested electric heating component 230 and preventing displacement, tilting, or detachment caused by assembly errors or operational vibrations. Furthermore, in the vertical direction, the first positioning plate 150 and the second positioning plate 170 can be set at the same height in a symmetrical layout; or they can be set at different heights in a staggered layout. This embodiment does not impose any specific limitations.

[0034] In addition, the shape and size of the positioning hole are designed to be adapted to the specific structural form of the corresponding rod, such as a circular, elliptical or irregular hole, to ensure that the ceramic rod 231 is installed firmly in the positioning hole and is not easy to shake.

[0035] Furthermore, both the first positioning plate 150 and the second positioning plate 170 are ceramic plates. It should be noted that using ceramic materials for the positioning plates effectively resists the high-temperature thermal stress generated during electric heating, preventing material deformation or structural failure due to temperature changes, thereby ensuring the dimensional stability and functional reliability of the positioning plates during long-term operation. Simultaneously, ceramic materials themselves have excellent electrical insulation properties, forming effective electrical isolation between the electric heating component 230 and the metal structure of the fixing unit 100, preventing leakage or short-circuit risks, and improving the overall operational safety of the electric heating device 10.

[0036] In addition, ceramic materials have strong corrosion resistance and oxidation resistance, and can maintain good chemical stability in the complex gas environment inside the RTO furnace 1. They are not easy to react with waste gas or oxidation products, thereby extending the overall service life of the electric heating device 10.

[0037] Furthermore, there are at least two first positioning plates 150 and two second positioning plates 170, both spaced apart along the vertical direction. Based on this arrangement, the structural rigidity of the ceramic rod 231 in the vertical direction can be effectively improved, preventing it from bending, tilting, or shifting under high temperature or airflow disturbance. The spaced arrangement of multiple positioning plates in the vertical direction can be rationally designed according to the height distribution of the ceramic rod 231, the winding area of ​​the electric heating wire 233, and the overall stress condition, thereby ensuring that the ceramic rod 231 receives sufficient support at all key locations.

[0038] In specific embodiments, the spacing between two adjacent first positioning plates 150, the spacing between two adjacent second positioning plates 170, and the vertical spacing between the first positioning plate 150 and the second positioning plate 170 can all be reasonably set according to actual structural requirements. Generally, on the one hand, the spacing should be avoided from being too large, so as to prevent the ceramic rod 231 from forming a large suspended span between the two positioning plates, thereby affecting its structural stability; on the other hand, the spacing should also be avoided from being too small, so as to prevent increasing assembly difficulty and material costs.

[0039] Please see Figure 6 The number of electric heating components 210 is at least two layers, and the at least two layers of electric heating components 210 are arranged at intervals along the horizontal direction to form a stacked distribution structure. It can be understood that by arranging multiple layers of electric heating components 210 along the horizontal direction, the heating coverage area can be effectively expanded without increasing the height of the device, which is suitable for RTO furnace structures with large cross-sectional dimensions. Correspondingly, the positioning plate can also have multiple positioning holes along the arrangement direction of the at least two layers of electric heating components 210, so that the same positioning plate can simultaneously position and fix the ceramic rods 231 in multiple electric heating components 210.

[0040] Furthermore, maintaining an appropriate spacing between the horizontally spaced layers of electric heating components 210 helps improve airflow organization. In specific embodiments, this spacing should comprehensively consider factors such as heating efficiency, airflow distribution, structural strength, and ease of installation and maintenance. If the spacing is too small, it may lead to uneven heat distribution, poor heat dissipation, and affect electrical insulation performance, while also increasing assembly difficulty; if the spacing is too large, it may result in wasted space, reduced heating density, and affect the overall heating effect. Therefore, preferably, the spacing should be optimized based on factors such as the power configuration of the electric heating device 10, the internal structure of the RTO furnace 1, gas flow rate, and temperature control requirements.

[0041] It should be noted that in the foregoing embodiments, "vertical direction" refers to the length extension direction of the first rod portion 2311 and / or the third rod portion 2315; while "horizontal direction" refers to the spatial direction that is perpendicular to both the extension direction of the first rod portion 2311 (or the third rod portion 2315) and the extension direction of the second rod portion 2313.

[0042] Furthermore, the electric heating components 210 in each layer can have the same or different sizes and shapes in terms of structure. For example, when using a U-shaped or square ceramic rod 231 structure, the electric heating components 230 in different layers can be designed as nested structures of different sizes according to actual needs, so as to achieve optimized spatial layout and control of heat field distribution.

[0043] In summary, this utility model provides an electric heating device 10, including a fixing unit 100 and an electric heating unit 200. The electric heating unit 200 includes at least one layer of electric heating components 210, and each layer of electric heating components 210 includes at least two electric heating elements 230. Each electric heating element 230 includes a ceramic rod 231, an electric heating wire 233, and two electrodes 235. The ceramic rod 231 is fixed to the fixing unit 100. The electric heating wire 233 is wound around the ceramic rod 231. The two leads of the electric heating wire 233 are respectively connected to the two electrodes 235, thereby forming an independent current path on each electric heating element 230. Based on the above structural design, in the electric heating device 10 provided by this utility model, each electric heating element 230 is independent of the others. When the heating wire 233 of one of the electric heating components 230 is damaged or broken, only the damaged electric heating component 230 needs to be replaced, instead of replacing the entire electric heating device 10. This avoids the problem of the entire equipment being shut down due to a local fault in the traditional structure, effectively improving the maintainability of the equipment and reducing maintenance costs.

[0044] Additionally, please see Figure 7This utility model also provides an RTO furnace 1, which includes a furnace body 30 and an electric heating device 10 as described in the previous embodiment, the electric heating device 10 being disposed within the furnace body 30. Since the RTO furnace 1 employs the aforementioned electric heating device 10, it can also avoid the problem of the entire equipment being shut down due to a partial failure in traditional structures, thereby effectively improving the maintainability of the equipment and reducing maintenance costs. Further details are omitted here.

[0045] The above are merely specific embodiments 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.

Claims

1. An electric heating device, characterized in that, The electric heating device (10) includes a fixing unit (100) and an electric heating unit (200); wherein the electric heating unit (200) includes at least one layer of electric heating components (210), and each layer of electric heating components (210) includes at least two electric heating elements (230). Each of the electric heating components (230) includes a ceramic rod (231), an electric heating wire (233), and two electrodes (235). The ceramic rod (231) is fixed on the fixing unit (100), the electric heating wire (233) is wound around the ceramic rod (231), and the two leads of the electric heating wire (233) are respectively connected to the two electrodes (235).

2. The electric heating device according to claim 1, characterized in that, The ceramic rod (231) includes a first rod portion (2311), a second rod portion (2313), and a third rod portion (2315); the first rod portion (2311), the second rod portion (2313), and the third rod portion (2315) are connected in sequence and together form a U-shaped structure; At least two electric heating elements (230) in each layer of the electric heating assembly (210) are nested sequentially according to the size of the U-shaped structure, and a ventilation channel (250) is formed between two adjacent U-shaped structures.

3. The electric heating device according to claim 1, characterized in that, The ceramic rod (231) includes a first rod portion (2311), a second rod portion (2313), a third rod portion (2315), and a fourth rod portion (2317); the first rod portion (2311), the second rod portion (2313), the third rod portion (2315), and the fourth rod portion (2317) are connected in sequence to form a square-shaped structure. At least two electric heating elements (230) in each layer of the electric heating assembly (210) are nested sequentially according to the size of the U-shaped structure, and a ventilation channel (250) is formed between two adjacent U-shaped structures.

4. The electric heating device according to claim 1, characterized in that, The ceramic rod (231) has a spiral groove on its outer periphery, and the electric heating wire (233) is wound along the spiral groove.

5. The electric heating device according to claim 2 or 3, characterized in that, The fixing unit (100) includes an inner frame (110), an outer frame (130), a first positioning plate (150), and a second positioning plate (170); wherein the inner frame (110) is located inside the ceramic rod (231) with the smallest enclosure shape, and the outer frame (130) is located outside the ceramic rod (231) with the largest enclosure shape. The first positioning plate (150) is connected between the outer wall of the inner frame (110) and the inner wall of the outer frame (130), and has a first positioning hole (151) that cooperates with the first rod part (2311); the second positioning plate (170) is connected between the outer wall of the inner frame (110) and the inner wall of the outer frame (130), and has a second positioning hole (171) that cooperates with the third rod part (2315).

6. The electric heating device according to claim 5, characterized in that, The number of the first positioning plate (150) and the second positioning plate (170) is at least two, and they are all spaced apart along the vertical direction.

7. The electric heating device according to claim 5, characterized in that, The number of electric heating components (210) is at least two layers, and the at least two layers of electric heating components (210) are arranged at intervals along the horizontal direction.

8. The electric heating device according to claim 5, characterized in that, Both the first positioning plate (150) and the second positioning plate (170) are ceramic plates.

9. The electric heating device according to claim 1, characterized in that, The electric heating device (10) further includes a heat insulation unit (300), a heat dissipation unit (400), and a junction box (500); each electrode (235) is fitted with an insulating sleeve (237), and is connected to the junction box (500) in sequence through the heat insulation unit (300), the heat dissipation unit (400).

10. An RTO furnace, characterized in that, It includes a furnace body (30) and an electric heating device (10) as described in any one of claims 1 to 9, wherein the electric heating device (10) is disposed within the furnace body (30).

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