Medium-high temperature electric heating furnace

Abstract

The embodiment of the invention provides a medium-high-temperature electric heating furnace. The medium-high-temperature electric heating furnace comprises a furnace body; the first end of the coil pipe assembly and the first end of the electric heater are arranged in the furnace body in a spaced mode, and the second end of the coil pipe assembly and the second end of the electric heater extend out of the outer side of the furnace body; the continuous heating assembly is located on the outer sides of the coil pipe assembly and the first end of the electric heater and rotationally connected with the inner wall of the furnace body; the continuous heating assembly comprises a heat conduction flexible bag, and the heat conduction flexible bag is filled with powdery fused salt so that the heat conduction flexible bag can be attached to the coil pipe assembly and the electric heater to rotate and is used for continuously transmitting heat of the electric heater to the coil pipe assembly so as to conduct continuous flowing continuous heating type heating on a medium flowing in the coil pipe assembly. According to the invention, the medium in the coil pipe is heated in a continuous flowing and continuous heating manner, the heat loss is less, the heating efficiency is high, the heating is stable and reliable, and the fused salt cannot be solidified on the wall surface of the furnace body to cause a series of problems of the furnace body.

Description

Technical Field

[0001] The embodiments of the present invention relate to the technical field of heating furnaces, and in particular to medium- and high-temperature electric heating furnaces. Background Art

[0002] The medium and high temperature electric heating furnace is a highly efficient, energy-saving and environmentally friendly heating equipment. It converts electrical energy into thermal energy through electric heating technology, has a fast heating speed, and has the characteristics of stable heating and precise temperature control. It adopts a unique high-power heating design and is suitable for different temperature control places to ensure the stability of the heating process. The intelligent control system makes the operation simple and easy to adjust the heating temperature to achieve accurate temperature regulation. The heating medium of the electric heating furnace mainly includes oil, water, gas, molten salt, etc. The heating process of the molten salt bath is: put the powdered molten salt into the melting tank, and heat and melt it through the heating element installed in the tank.

[0003] At present, in order to achieve uniform heating effect of molten salt, circulating heating or stirring heating can be used: 1. Circulation heating uses a circulation pump to force liquid phase circulation, transfers heat energy to heat-using equipment, and then returns for reheating. However, there will be heat loss in the process of pipeline transmission of molten salt; 2. Stirring heating: The molten salt in the molten salt tank is stirred by a stirring device, such as a stirring rod driven by a motor, so as to improve the heating uniformity of the molten salt. For example, the molten salt heating furnace disclosed in Publication No. CN116718008A has a stirring structure design that can avoid molten salt accumulation and shorten the heating time of the molten salt. However, the stirring structure is arranged around the heated structure and does not fully contact the heated structure. This is to avoid the heated structure interfering with the movement of the stirring structure. Therefore, the molten salt in direct contact with the heated structure will not be completely stirred, that is, the molten salt after heat exchange at the heated structure will not continue to flow to maintain timely heating after heat exchange, so the heating structure cannot be heated stably and continuously.

[0004] Secondly, whether the molten salt is transported through pipelines or directly filled into the furnace, the following problems are likely to occur when the molten salt cools and solidifies: 1. Pipeline blockage: Molten salt solidifies in the pipeline, which will cause the inner diameter of the pipeline to decrease, thus affecting the normal flow of the molten salt. In severe cases, it may cause pipeline blockage and affect the normal operation of the entire furnace system; 2. Increased thermal stress: The solidification of molten salt in the pipeline or furnace will cause the temperature of the pipeline wall or furnace wall to drop, thereby generating thermal stress. If the thermal stress is too large, it may cause the pipeline or furnace body to deform or rupture, and even cause a safety accident; 3. Impact on heat transfer efficiency: Molten salt solidification in the pipe or furnace will affect the heat transfer efficiency, thereby reducing thermal efficiency and increasing energy consumption; 4. Increased maintenance costs: Molten salt solidification in the pipe furnace will increase maintenance costs, including cleaning, repair and replacement costs.

[0005] Although the above-mentioned problems caused by the solidification of molten salt can be avoided by simply draining the molten salt from the pipe or furnace and cleaning it, this will undoubtedly increase the workload and labor intensity of the personnel. Summary of the invention

[0006] The embodiment of the present invention aims to solve at least one of the technical problems existing in the prior art, and provides a medium-high temperature electric heating furnace.

[0007] The embodiment of the present invention provides a medium-high temperature electric heating furnace, comprising: Furnace body; A coil assembly and an electric heater, wherein first ends of the coil assembly and the electric heater are spaced apart and arranged in the furnace body, and second ends of the coil assembly and the electric heater extend out of the furnace body; A heat-renewal component, which is located outside the first end of the coil assembly and the electric heater and is rotatably connected to the inner wall of the furnace body; the heat-renewal component includes a thermally conductive flexible bag, in which powdered molten salt is filled, so that the thermally conductive flexible bag can rotate in accordance with the coil assembly and the electric heater, and is used to continuously transfer the heat of the electric heater to the coil assembly, so as to perform continuous flow heat-renewal heating on the medium flowing in the coil assembly.

[0008] In some possible embodiments, a plurality of inner support blocks for supporting the inner cavity of the thermally conductive flexible bag are fixed inside the thermally conductive flexible bag.

[0009] In some possible embodiments, the thermally conductive flexible belt is configured as an annular belt connected end to end.

[0010] In some possible embodiments, the heat renewal component further includes a transmission roller group rotatably connected to the inner wall of the furnace body, and the transmission roller group is arranged on the inner side of the thermally conductive flexible belt, and the two form a belt transmission structure.

[0011] In some possible embodiments, a lower gas pipe and an upper gas pipe are respectively fixed to both ends of the furnace body along the radial direction, so as to facilitate the introduction of heat-conducting gas into the furnace body to perform double heating on the coil assembly.

[0012] In some possible embodiments, the coil assembly includes a coil, an inlet manifold, and an outlet manifold; The coil is arranged inside the furnace body, the inlet manifold and the outlet manifold are both arranged outside the furnace body, the inlet of the coil is fixedly connected to the inlet manifold, and the outlet of the coil is fixedly connected to the outlet manifold.

[0013] In some possible embodiments, the electric heater includes an electric heating tube and a heat-conducting reinforcement plate; The electric heating tube extends into the furnace body, and the heat-conducting reinforcement plate is fixed to the outer side of the electric heating tube; The portion of the thermally conductive flexible bag close to the electric heater is in contact with the outer surfaces of the electric heating tube and the thermally conductive reinforcing plate, and the portion of the thermally conductive flexible bag close to the coil assembly is in contact with the outer surface of the coil.

[0014] In some possible embodiments, a slideway assembly for supporting the coil assembly is provided at the bottom of the coil assembly; The slide assembly includes a plurality of horizontally distributed longitudinal beams, a plurality of cross beams fixed between the plurality of longitudinal beams, pads fixed to the front and rear ends of two longitudinal beams on both sides, and a supporting rib plate fixed between the pads and the bottom of the longitudinal beams; The pad is fixed to the inner wall of the furnace body, and the lengths of the two longitudinal beams on both sides are greater than the length of the middle longitudinal beam; The thermally conductive flexible bag is located between two longitudinal beams on both sides, and the thermally conductive flexible bag is located outside the middle longitudinal beam.

[0015] In some possible embodiments, a support seat is fixed to the bottom end of the coil, the support seat is arranged on the top of the slideway assembly, and the support seat is slidably connected to the slideway assembly through a first slideway; The furnace body is provided with mounting openings on both sides, and mounting tubes are fixed outside the mounting openings. The coil extends out of the first side of the furnace body through one of the mounting tubes, and a first mounting plate connected to the mounting tube is fixed on the coil.

[0016] In some possible embodiments, a first support frame is fixed to the bottom end of the furnace body, the first support frame is arranged at the bottom end of the electric heating tube for supporting the electric heating tube, and the first support frame is slidably connected to the heat conductive reinforcement plate through a second slideway; The electric heater extends out of the second side of the furnace body through another mounting tube, and a second mounting plate connected to the mounting tube is fixed on the electric heater.

[0017] In the medium and high temperature electric heating furnace of the embodiment of the present invention, the heat-conducting flexible bag carries the molten salt and passes along the surface of the electric heating tube. After the molten salt is heated, it passes through the coil to exchange heat with the medium in the coil, heats the medium, and then the molten salt after heat exchange is heated at the electric heating tube and then heats the coil through the coil, so as to circulate. At the same time, the heat-conducting gas is injected into the furnace body to fill the dead corners of the coil that are not heated by the molten salt, so that the heat is continuously and evenly transferred to the coil, that is, the temperature at the coil can always be continued, so that the medium in the coil is heated by continuous flow and continuous heating, with less heat loss, high heating efficiency, and stable and reliable heating. In addition, in the embodiment of the present invention, the molten salt does not directly contact the wall of the furnace body, so the molten salt will not solidify on the wall of the furnace body, thereby avoiding a series of problems caused by the solidification of the molten salt. Finally, the sliding installation of the coil assembly and the electric heater of the embodiment of the present invention is convenient for pulling out of the furnace body for maintenance, thereby improving the convenience of equipment maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 It is a front cross-sectional view of the overall structure of a medium-high temperature electric heating furnace according to an embodiment of the present invention; Figure 2 A side cross-sectional view of the interior of a furnace body according to an embodiment of the present invention; Figure 3 It is an external side view of a furnace body according to an embodiment of the present invention; Figure 4 It is a schematic diagram of the structure of the thermally conductive flexible bag, the electric heating tube and the coil according to an embodiment of the present invention; Figure 5 This is a structural diagram of a heating component according to an embodiment of the present invention; Figure 6 A top view of the slide assembly according to an embodiment of the present invention; Figure 7 A side structural diagram of a slideway assembly according to an embodiment of the present invention; Figure 8 This is a schematic diagram of the installation of an outlet manifold and an outlet manifold instrument according to an embodiment of the present invention.

[0020] Description of reference numerals: 1 furnace body, 2 coil assembly, 21 coil, 22 inlet manifold, 23 outlet manifold; 3 electric heaters, 4 electric heating tubes; 5 heat-continuing component, 51 thermally conductive flexible bag, 52 inner support block; 6 heat-conducting reinforcement plate, 7 support seat; 8 slideway assembly, 81 longitudinal beam, 82 cross beam, 83 pad, 84 supporting rib plate; 9 first slideway, 10 support frame, 11 second slideway, 12 mounting tube, 13 first mounting plate, 14 lower air pipe, 15 upper air pipe, 16 second mounting plate, 17 manhole, 18 saddle support. DETAILED DESCRIPTION

[0021] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the described embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work are within the scope of protection of the present invention.

[0022] Unless otherwise specified, the technical terms or scientific terms used in the embodiments of the present invention should be understood by people with ordinary skills in the field to which the present invention belongs. "Including" or "comprising" used in the embodiments of the present invention neither limit the shapes, numbers, steps, actions, operations, components, originals and / or their groups mentioned, nor exclude the appearance or addition of one or more other different shapes, numbers, steps, actions, operations, components, originals and / or their groups, or the addition of these. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number and order of the indicated technical features. Thus, the features defined as "first" and "second" can explicitly or implicitly include one or more of the features. In the description of the embodiments of the present invention, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0023] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps set forth in these embodiments do not limit the scope of the present invention. Meanwhile, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to actual proportional relationships, and the technology, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail. In all examples shown and discussed here, any specific other examples may have different values. It should be noted that similar symbols and letters represent similar items in the following drawings, and therefore, once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0024] In the description of the embodiments of the present invention, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In the embodiments of the present invention, the schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in the embodiments of the present invention and the features of the different embodiments or examples, without contradiction.

[0025] Below, the exemplary embodiments according to the present invention will be described in detail with reference to the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments of the present invention, and it should be understood that the present invention is not limited to the exemplary embodiments described here.

[0026] The embodiments of the present invention provide Figures 1 to 8 The medium-high temperature electric heating furnace shown includes a furnace body 1, a plurality of manholes 17 are fixed on the top of the furnace body 1, a plurality of tension plates are fixed on both side walls inside the furnace body 1 to improve the strength of the furnace body 1, and a saddle support 18 is fixed on the bottom end of the furnace body 1 to support it.

[0027] The furnace body 1 is provided with a coil assembly 2 and an electric heater 3 which are distributed up and down. The coil assembly 2 and the electric heater 3 extend out of both sides of the furnace body 1 respectively. Specifically, the coil assembly 2 includes a coil 21, an inlet manifold 22 and an outlet manifold 23. The coil 21 is arranged inside the furnace body 1, and the inlet manifold 22 and the outlet manifold 23 are both arranged outside the furnace body 1. The inlet of the coil 21 is fixedly connected with the inlet manifold 22, and the outlet of the coil 21 is fixedly connected with the outlet manifold 23. The medium enters the coil 21 through the inlet manifold 22 to be heated, and then is discharged through the outlet manifold 23. Figure 8 As shown, instruments such as pressure gauges, thermometers, etc. can be installed on the inlet manifold 22 and the outlet manifold 23 as needed to monitor pressure and temperature to ensure safety.

[0028] The electric heating tube 4 on the electric heater 3 extends into the interior of the furnace body 1, and a heat-conducting reinforcement plate 6 is fixed to the outside of the electric heating tube 4. The heat-conducting reinforcement plate 6 can reinforce the multiple electric heating tubes 4 on the one hand, and transfer heat to the outside on the other hand. The heat-conducting reinforcement plate 6 is made of a material with good thermal conductivity, such as copper, aluminum, etc.

[0029] Then, if Figure 2 and Figure 4As shown, two groups of reheating components 5 are provided inside the furnace body 1, and the reheating components 5 are provided outside the coil component 2 and the electric heater 3. The reheating components 5 include a heat-conducting flexible bag 51, and the heat-conducting flexible bag 51 is filled with powdered molten salt. The molten salt is a mixture of potassium nitrate, sodium nitrite and sodium nitrate. The powdered molten salt can be changed into a molten state when heated above the melting point. At the same time, the molten salt also has a heat storage function. Molten salt heat storage is a technology that uses the characteristics of molten salt to store heat. Molten salt has the characteristics of a large temperature range, high specific heat capacity, and good heat exchange performance. It can store heat, and when the heat is needed, the stored heat can be transferred through heat exchange for use.

[0030] The thermally conductive flexible bag 51 is configured as an annular belt connected end to end, and the annular belt and the transmission roller group distributed on the inner side thereof form a belt transmission structure, so that the thermally conductive flexible bag 51 fits the coil assembly 2 and the electric heater 3 and rotates, and the transmission roller group is arranged in the furnace body 1 and is rotationally connected to the inner wall of the furnace body 1. It should be noted that the arrangement of the transmission roller group must not interfere with other structures in the furnace body 1, and the thermally conductive flexible bag 51 is sleeved on the outside of the transmission roller group. The existing driving structure can be used to drive the transmission roller group to rotate. This embodiment gives an example of a driving structure: the transmission roller group is driven to rotate by a driving device such as a motor, and the transmission roller group is connected by a belt, a pulley transmission structure or a sprocket, a chain transmission structure to realize the same-direction rotation of the transmission roller group. The rotation of the transmission roller group drives the thermally conductive flexible bag 51 to rotate through friction, so as to achieve the following: Figure 2 and Figure 4 As shown, the thermally conductive flexible bag 51 on the left rotates counterclockwise, and the thermally conductive flexible bag 51 on the right rotates clockwise.

[0031] A plurality of inner support blocks 52 for supporting the inner cavity of the thermally conductive flexible bag 51 are fixed therein. The portion of the thermally conductive flexible bag 51 close to the electric heater 3 is in contact with the outer surface of the electric heating tube 4 and the thermally conductive reinforcement plate 6 for heating the powdered molten salt in the thermally conductive flexible bag 51. The thermally conductive flexible bag 51 is made of a flexible material and can be in contact with both the electric heating tube 4 and the thermally conductive reinforcement plate 6. The portion of the thermally conductive flexible bag 51 close to the coil assembly 2 is in contact with the outer surface of the coil 21 for transferring the heat of the powdered molten salt to the coil 21. The thermally conductive flexible bag 51 is made of a flexible material with good thermal conductivity, for example: ① Thermally conductive silicone rubber: It is a common flexible thermally conductive material. Its thermal conductivity can be improved by adding thermally conductive powder. For example, by optimizing the selection, shape and gradation of thermally conductive powder, the steric hindrance caused by powder accumulation can be reduced, thereby improving the thermal conductivity of thermally conductive silicone rubber. ② Graphene-based materials: Graphene is a material with excellent thermal conductivity, with a thermal conductivity of up to about 1200W / mK. By compounding graphene with other materials, materials with high thermal conductivity and flexibility can be prepared. For example, the team of Professor Li Baowen of Southern University of Science and Technology prepared stable LM@GNLiquid metal@Grapheneanosheet coated droplets by ultrasound. The π-π interaction between GN and ANFRamid nanofiber made the LM@GN filler evenly dispersed in the LM@GN / ANF film to form a good thermal conductive network. The film achieved a high thermal conductivity of 5.67 W•m-1K-1. ③ Carbon nanofiber CNF and carbon nanotube CNT composites: The University of Tokyo and the National Institute of Advanced Industrial Science and Technology of Japan have developed a rubber composite material that is as soft as rubber and has a thermal conductivity comparable to that of metal by combining two fibrous carbon materials, carbon nanofiber CNF and carbon nanotube CNT, with a cyclic polymer material, polyrotaxane. The new rubber composite material has a high thermal conductivity of 14W / mK in the direction of CNF arrangement; ④ Flexible graphene thermal conductive film: The ultra-flexible graphene thermal conductive film developed by Mo Rui Technology has excellent properties such as high thermal conductivity, high flexibility, light weight and strong thermal stability. The thermal conductive film can realize large heat transmission across the screen. After more than 500,000 times of 180° opening and closing and bending, the thermal conductivity loss is <1%, which is almost no decrease.

[0032] During heating, the electric heater 3 is set to medium or high temperature heating, and the thermally conductive flexible bag 51 rotates and passes along the surface of the electric heating tube 4. The heat is transferred to the molten salt through the thermally conductive flexible bag 51. After the molten salt stores heat, it passes through the coil 21 to exchange heat with the medium in the coil 21 to achieve heating of the medium. The molten salt after heat exchange then rotates to the electric heating tube 4 for heating and then passes through the coil 21 to heat the coil 21. In this cycle, the heat is continuously transferred to the coil 21, so that the molten salt at the coil 21 always maintains the temperature, that is, the molten salt can continue to heat the medium in time, thereby achieving continuous flow and continuous heating of the medium in the coil 21, with less heat loss and stable and reliable heating.

[0033] At the same time, if Figures 1 to 3As shown, a lower air pipe 14 and an upper air pipe 15 are fixed at the bottom and top of the furnace body 1, respectively. Valves need to be installed on the lower air pipe 14 and the upper air pipe 15 to facilitate the introduction of heat-conducting gas into the furnace body 1. The heat-conducting gas can be hydrogen. Hydrogen is a very good heat-conducting medium, and its thermal conductivity is better than most other gases. The thermal conductivity of hydrogen is mainly determined by its molecular structure and molecular motion characteristics. A hydrogen molecule is composed of two hydrogen atoms, each of which has an atomic nucleus and an electron. Hydrogen molecules transfer heat energy by moving between molecules, that is, by colliding, heat energy is transferred from one molecule to another. Due to the small size and light weight of hydrogen molecules, the intermolecular interaction force is very small, resulting in good thermal conductivity of hydrogen. Since the density of hydrogen is less than that of air, hydrogen enters the furnace body 1 from the lower air pipe 14 and pushes the air in the furnace body out from the upper air pipe 15, so that the furnace body 1 is filled with hydrogen.

[0034] The heat-conducting gas is heated after entering the furnace body 1. The heat-conducting gas can fill the dead corners of the coil 21 that are not heated by the molten salt, thereby conducting heat to the coil 21, achieving double heating of the coil 21, and making the heating uniform, thereby improving the heating efficiency.

[0035] Since the molten salt is not directly filled in the furnace body 1 in the present invention, there is no need to worry about the molten salt solidifying on the furnace body 1, thus avoiding the problem of the traditional heating furnace directly injecting the molten salt into the furnace due to the molten salt not being completely discharged or the molten salt being transported through pipelines.

[0036] In addition, in order to facilitate the disassembly and maintenance of the coil assembly 2, Figure 1-Figure 4 , Figure 6 and Figure 7 As shown, a slide assembly 8 for supporting the coil assembly 2 is provided at the bottom of the coil assembly 2, the slide assembly 8 includes a plurality of horizontally distributed longitudinal beams 81, a plurality of cross beams 82 are fixed between the plurality of longitudinal beams 81, the length of the two longitudinal beams 81 on both sides is greater than the length of the middle longitudinal beam 81, and pads 83 are fixed to the front and rear ends of the two longitudinal beams 81 on both sides, the pads 83 are fixed to the inner wall of the furnace body 1, and a supporting rib 84 is fixed between the pads 83 and the bottom of the longitudinal beams 81, the thermally conductive flexible bag 51 is located between the two longitudinal beams 81 on both sides, and the thermally conductive flexible bag 51 is located on the outside of the middle longitudinal beam 81, and the slide assembly 8 will not hinder the rotation of the thermally conductive flexible bag 51; a support seat 7 is fixed to the bottom end of the coil 21, the support seat 7 is arranged at the top of the slide assembly 8, and the support seat 7 and the slide assembly 8 are slidably connected through the first slide 9.

[0037] Mounting openings are also provided on both sides of the furnace body 1, and mounting tubes 12 are fixed on the outside of the mounting openings. The coil 21 extends out of one side of the furnace body 1 through one of the mounting tubes 12, and a first mounting plate 13 connected to the mounting tube 12 is fixed on the coil 21. The mounting tube 12 and the first mounting plate 13 are fixed by bolts, and there is a sealing gasket between the mounting tube 12 and the first mounting plate 13 for sealing.

[0038] After unscrewing the bolts on the first mounting plate 13, the coil assembly 2 is pulled outward, and the support seat 7 of the coil assembly 2 can slide along the slide assembly 8, so that the coil assembly 2 can be easily pulled out of the furnace body 1 for maintenance.

[0039] At the same time, in order to facilitate the disassembly and maintenance of the electric heater 3, Figure 1 , Figure 2 and Figure 4 As shown, a support frame 10 is fixed at the bottom end of the furnace body 1, and the support frame 10 is arranged at the bottom end of the electric heating tube 4 for supporting the electric heating tube 4, and the heat-conducting reinforcement plate 6 on the outside of the electric heating tube 4 is slidably connected to the support frame 10 through a second slide 11, and the electric heater 3 extends out of the other side of the furnace body 1 through another mounting tube 12, and a second mounting plate 16 connected to the mounting tube 12 is fixed on the electric heater 3, the mounting tube 12 and the second mounting plate 16 are fixed by bolts, and there is a sealing gasket for sealing between the mounting tube 12 and the second mounting plate 16.

[0040] After unscrewing the bolts on the second mounting plate 16, the electric heater 3 is pulled outward, and the heat-conducting reinforcement plate 6 can slide along the support frame 10, so that the electric heater 3 can be pulled out of the furnace body 1 for maintenance.

[0041] It should be noted that, in order to prevent the thermally conductive flexible bag 51 from loosening, two tensioners need to be installed on the inner wall of the furnace body 1, such as Figure 2 and Figure 4 As shown, the tensioner is located outside the thermally conductive flexible bag 51 and is used to tension the thermally conductive flexible bag 51 , for example, to prevent the thermally conductive flexible bag 51 from loosening after the coil assembly 2 and the electric heater 3 are withdrawn.

[0042] The inspection and maintenance of the coil assembly 2 and the electric heater 3 takes place after the heating work is completed. At this time, the upper air pipe 15 is opened to discharge the heat-conducting gas, which can be recovered through the heat recovery equipment. There is still heat remaining in the furnace body 1, which makes the pressure in the furnace body 1 higher than the external pressure. At this time, when the coil assembly 2 and the electric heater 3 are pulled out, the pressure in the furnace body 1 will push the coil assembly 2 and the electric heater 3 outward, making the inspection and maintenance work of the personnel less labor-intensive.

[0043] It is to be understood that the above embodiments are merely exemplary embodiments used to illustrate the principles of the present invention, but the present invention is not limited thereto. For those of ordinary skill in the art, various modifications and improvements can be made without departing from the spirit and essence of the present invention, and these modifications and improvements are also considered to be within the scope of protection of the present invention.

Claims

1. A medium-high temperature electric heating furnace, characterized in that: include: Furnace body; A coil assembly and an electric heater, wherein first ends of the coil assembly and the electric heater are spaced apart and arranged in the furnace body, and second ends of the coil assembly and the electric heater extend out of the furnace body; A heat-renewal component, which is located outside the first end of the coil assembly and the electric heater and is rotatably connected to the inner wall of the furnace body; the heat-renewal component includes a thermally conductive flexible bag, in which powdered molten salt is filled, so that the thermally conductive flexible bag can rotate in accordance with the coil assembly and the electric heater, and is used to continuously transfer the heat of the electric heater to the coil assembly, so as to perform continuous flow heat-renewal heating on the medium flowing in the coil assembly.

2. The medium-high temperature electric heating furnace according to claim 1, characterized in that: A plurality of inner support blocks for supporting the inner cavity of the thermally conductive flexible bag are fixed inside the bag.

3. The medium-high temperature electric heating furnace according to claim 1, characterized in that: The thermally conductive flexible belt is configured as an annular belt connected end to end.

4. The medium-high temperature electric heating furnace according to any one of claims 1 to 3, characterized in that: The heat-renewal component also includes a transmission roller group rotatably connected to the inner wall of the furnace body, and the transmission roller group is arranged on the inner side of the heat-conducting flexible belt, and the two form a belt transmission structure.

5. The medium-high temperature electric heating furnace according to any one of claims 1 to 3, characterized in that: The furnace body is respectively fixed with a lower gas pipe and an upper gas pipe at both ends along the radial direction thereof, so as to facilitate the introduction of heat-conducting gas into the furnace body to double heat the coil assembly.

6. The medium-high temperature electric heating furnace according to any one of claims 1 to 3, characterized in that: The coil assembly includes a coil, an inlet manifold and an outlet manifold; The coil is arranged inside the furnace body, the inlet manifold and the outlet manifold are both arranged outside the furnace body, the inlet of the coil is fixedly connected to the inlet manifold, and the outlet of the coil is fixedly connected to the outlet manifold.

7. The medium-high temperature electric heating furnace according to claim 6, characterized in that: The electric heater comprises an electric heating tube and a heat-conducting reinforcement plate; The electric heating tube extends into the furnace body, and the heat-conducting reinforcement plate is fixed to the outer side of the electric heating tube; The portion of the thermally conductive flexible bag close to the electric heater is in contact with the outer surfaces of the electric heating tube and the thermally conductive reinforcing plate, and the portion of the thermally conductive flexible bag close to the coil assembly is in contact with the outer surface of the coil.

8. The medium-high temperature electric heating furnace according to claim 7, characterized in that: The bottom of the coil assembly is provided with a slideway assembly for supporting the coil assembly; The slide assembly includes a plurality of horizontally distributed longitudinal beams, a plurality of cross beams fixed between the plurality of longitudinal beams, pads fixed to the front and rear ends of two longitudinal beams on both sides, and a supporting rib plate fixed between the pads and the bottom of the longitudinal beams; The pad is fixed to the inner wall of the furnace body, and the lengths of the two longitudinal beams on both sides are greater than the length of the middle longitudinal beam; The thermally conductive flexible bag is located between two longitudinal beams on both sides, and the thermally conductive flexible bag is located outside the middle longitudinal beam.

9. The medium-high temperature electric heating furnace according to claim 8, characterized in that: A support seat is fixed at the bottom end of the coil, the support seat is arranged on the top of the slideway assembly, and the support seat is slidably connected to the slideway assembly through a first slideway; The furnace body is provided with mounting openings on both sides, and mounting tubes are fixed outside the mounting openings. The coil extends out of the first side of the furnace body through one of the mounting tubes, and a first mounting plate connected to the mounting tube is fixed on the coil.

10. The medium-high temperature electric heating furnace according to claim 9, characterized in that: A first support frame is fixed at the bottom end of the furnace body, the first support frame is arranged at the bottom end of the electric heating tube for supporting the electric heating tube, and the first support frame is slidably connected to the heat-conducting reinforcement plate through a second slideway; The electric heater extends out of the second side of the furnace body through another mounting tube, and a second mounting plate connected to the mounting tube is fixed on the electric heater.

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