Medium and high temperature electric heating furnace

Abstract

An embodiment of the present invention provides a medium and high temperature electric heating furnace, comprising: a furnace body; a coil assembly and an electric heater, the first ends of the coil assembly and the electric heater are spaced apart and arranged inside the furnace body, and the second ends of the coil assembly and the electric heater extend outside the furnace body; a heat continuation assembly, the heat continuation assembly is located outside the first ends of the coil assembly and the electric heater and is rotatably connected to the inner wall of the furnace body; the heat continuation assembly includes a heat-conducting flexible bag filled with powdery molten salt inside, so that the heat-conducting flexible bag can fit and rotate along the coil assembly and the electric heater, and is used for continuously transferring the heat of the electric heater to the coil assembly to perform continuous flow heat continuation heating on the medium flowing in the coil assembly. The present invention realizes continuous flow heat continuation heating on the medium in the coil, with less heat loss, high heating efficiency, stable and reliable heating, and the molten salt will not solidify on the furnace wall surface to cause a series of problems in the furnace body.

Description

Technical Field

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

[0002] Medium and high temperature electric heating furnaces are efficient, energy-saving, and environmentally friendly heating devices. They convert electrical energy into heat energy through electric heating technology, with a fast heating speed, stable heating, and precise temperature control. They adopt a unique high-power heating design, are suitable for different temperature control scenarios, ensure the stability of the heating process, and the intelligent control system makes the operation simple and easy to adjust the heating temperature to achieve accurate temperature regulation. The heating media of electric heating furnaces mainly include oil, water, gas, molten salt, etc. The heating process of the molten salt bath is as follows: Put the powdered molten salt into the melting tank and heat it to melt by the heating elements installed in the tank.

[0003] Currently, to achieve a uniform heating effect of molten salt, the following methods can be adopted:

[0004] 1. Circulation heating forces the liquid phase to circulate through a circulation pump, transports the heat energy to the heat-using equipment, and then returns to be reheated. However, there will be heat loss during the pipeline transportation of molten salt.

[0005] 2. Stirring heating is carried out by equipping a stirring device, such as a stirring rod driven by a motor, to stir the molten salt in the molten salt tank, thereby improving the uniform heating of the molten salt. For example, in a molten salt heating furnace with the publication number CN116718008A, although the stirring structure design can avoid the accumulation of molten salt and shorten the heating time of molten salt, since the stirring structure is arranged around the heated structure and does not come into complete contact with the heated structure, this is to avoid interference between the heated structure and 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 continuously flow to maintain timely reheating after heat exchange. Therefore, it is impossible to stably and continuously heat the heating structure.

[0006] Secondly, whether the molten salt is transported through pipelines or directly filled into the furnace body, the following problems are likely to occur due to the cooling and solidification of molten salt:

[0007] 1. Pipeline blockage: The solidification of molten salt in the pipeline will cause the inner diameter of the pipeline to decrease, thereby affecting the normal flow of molten salt. In severe cases, it may cause pipeline blockage and affect the normal operation of the entire furnace system.

[0008] 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 deformation, rupture of the pipeline or furnace body, and even lead to safety accidents.

[0009] 3. Affect heat transfer efficiency: The solidification of molten salt in the pipeline or furnace will affect the heat transfer efficiency, thereby reducing the thermal efficiency and increasing energy consumption.

[0010] 4. Increase maintenance costs: The solidification of molten salt in the pipeline or furnace will increase maintenance costs, including cleaning, repair, and replacement costs.

[0011] Although the above problems caused by the solidification of molten salt can be avoided by simply draining the molten salt in the pipeline or furnace and then cleaning it, this will undoubtedly increase the workload of personnel and the labor intensity of personnel. Summary of the Invention

[0012] The embodiments of the present invention aim to at least solve one of the technical problems existing in the prior art, and provide a medium-high temperature electric heating furnace.

[0013] The embodiments of the present invention provide a medium-high temperature electric heating furnace, including:

[0014] A furnace body;

[0015] A coil assembly and an electric heater, the first ends of the coil assembly and the electric heater are spaced apart and arranged in the furnace body, and the second ends of the coil assembly and the electric heater extend outside the furnace body;

[0016] A heat continuation assembly, the heat continuation assembly is located outside the first ends of the coil assembly and the electric heater and is rotatably connected to the inner wall of the furnace body; the heat continuation assembly includes a heat-conducting flexible bag, and powdery molten salt is filled in the heat-conducting flexible bag, so that the heat-conducting flexible bag can fit and rotate with the coil assembly and the electric heater, and is used to continuously transfer the heat of the electric heater to the coil assembly to continuously heat the medium flowing in the coil assembly in a continuous-flow heat continuation manner.

[0017] In some possible embodiments, a plurality of inner support blocks for supporting the inner cavity are fixed in the heat-conducting flexible bag.

[0018] In some possible embodiments, the heat-conducting flexible belt is arranged as an annular belt connected end to end.

[0019] In some possible embodiments, the heat continuation assembly further includes a transmission roller group rotatably connected to the inner wall of the furnace body, and the transmission roller group is arranged inside the heat-conducting flexible belt, and the two form a belt transmission structure.

[0020] In some possible embodiments, a lower air pipe and an upper air pipe are respectively fixed at both ends of the furnace body along its radial direction, which is convenient for introducing heat-conducting gas into the furnace body to double heat the coil assembly.

[0021] In some possible embodiments, the coil assembly includes a coil, an inlet header, and an outlet header;

[0022] The coil pipe is arranged inside the furnace body, the inlet header and the outlet header are both arranged outside the furnace body, the inlet of the coil pipe is fixedly communicated with the inlet header, and the outlet of the coil pipe is fixedly communicated with the outlet header.

[0023] In some possible embodiments, the electric heater includes an electric heating pipe and a heat-conducting reinforcement plate;

[0024] The electric heating pipe extends into the furnace body, and the heat-conducting reinforcement plate is fixed to the outer side of the electric heating pipe;

[0025] The heat-conducting flexible bag is attached to the outer surfaces of the electric heating pipe and the heat-conducting reinforcement plate at the part close to the electric heater, and the part of the heat-conducting flexible bag close to the coil assembly is attached to the outer surface of the coil pipe.

[0026] In some possible embodiments, a slideway assembly for supporting the coil assembly is arranged at the bottom of the coil assembly;

[0027] The slideway assembly includes a plurality of longitudinally arranged beams distributed horizontally, a plurality of cross beams fixed between the plurality of longitudinally arranged beams, backing plates fixed at the front and rear ends of the two longitudinally arranged beams on both sides, and support rib plates fixed between the backing plates and the bottom of the longitudinally arranged beams;

[0028] The backing plates are fixed to the inner wall of the furnace body, and the lengths of the two longitudinally arranged beams on both sides are greater than the length of the middle longitudinally arranged beam;

[0029] The heat-conducting flexible bag is located between the two longitudinally arranged beams on both sides, and the heat-conducting flexible bag is located outside the middle longitudinally arranged beam.

[0030] In some possible embodiments, a support seat is fixed to the bottom end of the coil pipe, the support seat is arranged on the top of the slideway assembly, and the support seat is slidably connected with the slideway assembly through a first slideway;

[0031] Installation openings are formed on both sides of the furnace body, and installation cylinders are fixed outside the installation openings. The coil pipe extends out of the first side of the furnace body through one of the installation cylinders, and a first mounting plate connected to the installation cylinder is fixed on the coil pipe.

[0032] In some possible embodiments, a first support frame is fixed to the bottom end inside the furnace body, the first support frame is arranged at the bottom end of the electric heating pipe to support the electric heating pipe, and the first support frame is slidably connected with the heat-conducting reinforcement plate through a second slideway;

[0033] The electric heater extends out of the second side of the furnace body through the other installation cylinder, and a second mounting plate connected to the installation cylinder is fixed on the electric heater.

[0034] In the medium- and high-temperature electric heating furnace according to the embodiment of the present invention, the heat-conducting flexible bag carries molten salt along the surface of the electric heating tube. After being heated, the molten salt passes through the coil pipe and exchanges heat with the medium in the coil pipe to heat the medium. The molten salt after heat exchange is then heated at the electric heating tube and then passes through the coil pipe to heat the coil pipe. This cycle continues. At the same time, a heat-conducting gas is injected into the furnace body to fill the dead corners of the coil pipe that are not heated by the molten salt, so as to continuously and evenly transfer heat to the coil pipe, that is, the temperature at the coil pipe can always be maintained, realizing continuous-flow continuous-heat heating of the medium in the coil pipe, 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 furnace body wall surface, so the molten salt will not solidify on the furnace body wall surface, thereby avoiding a series of problems caused by the solidification of the molten salt in the furnace body. Finally, the sliding installation of the coil pipe assembly and the electric heater in the embodiment of the present invention is convenient for being pulled out of the furnace body for maintenance, improving the convenience of equipment maintenance. Description of the Drawings

[0035] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the following drawings are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0036] Figure 1 It is the front view sectional view of the overall structure of the medium- and high-temperature electric heating furnace according to the embodiment of the present invention;

[0037] Figure 2 It is the side view sectional view of the inside of the furnace body according to the embodiment of the present invention;

[0038] Figure 3 It is the side view of the outside of the furnace body according to the embodiment of the present invention;

[0039] Figure 4 It is the structural schematic diagram of the heat-conducting flexible bag, the electric heating tube and the coil pipe according to the embodiment of the present invention;

[0040] Figure 5 It is the structural diagram of the continuous-heat component according to the embodiment of the present invention;

[0041] Figure 6 It is the top view structural diagram of the slideway component according to the embodiment of the present invention;

[0042] Figure 7 It is the side view structural diagram of the slideway component according to the embodiment of the present invention;

[0043] Figure 8 It is the installation schematic diagram of the outlet header and the outlet header instrument according to the embodiment of the present invention.

[0044] Description of the reference numerals:

[0045] 1 furnace body, 2 coil pipe assemblies, 21 coil pipes, 22 inlet header, 23 outlet header;

[0046] 3 electric heaters, 4 electric heating pipes;

[0047] 5 reheating assemblies, 51 heat-conducting flexible bags, 52 inner support blocks;

[0048] 6 heat-conducting reinforcement plates, 7 support seats;

[0049] 8 slideway assemblies, 81 longitudinal beams, 82 cross beams, 83 backing plates, 84 support rib plates;

[0050] 9 first slideways, 10 support frames, 11 second slideways, 12 mounting cylinders, 13 first mounting plates, 14 lower air pipes, 15 upper air pipes, 16 second mounting plates, 17 manholes, 18 saddle supports. Detailed implementation manners

[0051] To enable those skilled in the art to better understand the technical solutions of the present invention, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific implementation manners. 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 efforts shall fall within the scope of protection of the present invention.

[0052] Unless otherwise specifically stated, the technical terms or scientific terms used in the embodiments of the present invention should be the ordinary meanings understood by those with ordinary skills in the field to which the present invention belongs. The "including" or "comprising" used in the embodiments of the present invention neither limits the mentioned shapes, numbers, steps, actions, operations, components, elements and / or their groups, nor excludes the appearance or addition of one or more other different shapes, numbers, steps, actions, operations, components, elements 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 quantity and order of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the embodiments of the present invention, "a plurality of" means two or more, unless otherwise specifically and clearly defined.

[0053] Unless otherwise specifically stated, the relative settings, numerical expressions, and numerical values of the components and steps set forth in these embodiments do not limit the scope of the present invention. At the same time, it should be understood that, for the sake of convenience of description, the dimensions of the various parts shown in the drawings are not drawn in actual proportional relationships, and technologies, methods, and devices known to those of ordinary skill in the relevant art may not be discussed in detail. In all the 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. Therefore, once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0054] In the description of the embodiments of the present invention, the description with reference to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials, or characteristics described in connection 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 expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in the embodiments of the present invention and the features of different embodiments or examples.

[0055] Next, exemplary embodiments of the present invention will be described in detail with reference to the drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments of the present invention. It should be understood that the present invention is not limited by the exemplary embodiments described herein.

[0056] The embodiments of the present invention provide a medium- and high-temperature electric heating furnace as Figures 1 to 8 shown, which includes a furnace body 1. A plurality of manholes 17 are fixed to the top end of the furnace body 1. A plurality of stay plates are fixed to both inner side walls of the furnace body 1 to improve the strength of the furnace body 1, and a saddle support 18 for supporting the furnace body 1 is fixed to the bottom end of the furnace body 1.

[0057] A coil assembly 2 and an electric heater 3 are provided in the furnace body 1 and are distributed vertically. The coil assembly 2 and the electric heater 3 respectively extend out of both sides of the furnace body 1. Specifically, the coil assembly 2 includes a coil 21, an inlet header 22, and an outlet header 23. The coil 21 is arranged inside the furnace body 1, and both the inlet header 22 and the outlet header 23 are arranged outside the furnace body 1. The inlet of the coil 21 is fixedly communicated with the inlet header 22, and the outlet of the coil 21 is fixedly communicated with the outlet header 23. The medium enters the coil 21 through the inlet header 22 to be heated, and then is discharged through the outlet header 23. As Figure 8As shown, instruments such as pressure gauges and thermometers can be installed on the inlet header 22 and the outlet header 23 as required to monitor pressure and temperature to ensure safety.

[0058] The electric heating tubes 4 on the electric heater 3 extend into the furnace body 1, and a heat-conducting reinforcement plate 6 is fixed on the outer side of the electric heating tubes 4. On the one hand, the heat-conducting reinforcement plate 6 can reinforce the multiple electric heating tubes 4, and on the other hand, it can transfer heat outward. The heat-conducting reinforcement plate 6 is made of a material with good heat conductivity, such as copper, aluminum, etc.

[0059] Next, as Figure 2 and Figure 4 shown, two heat-retaining components 5 are provided inside the furnace body 1. The heat-retaining components 5 are arranged outside the coil assembly 2 and the electric heater 3. The heat-retaining component 5 includes a heat-conducting flexible bag 51. The heat-conducting flexible bag 51 is filled with powdery molten salt. The molten salt is a mixture of potassium nitrate, sodium nitrite and sodium nitrate. The powdery molten salt can become 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 characteristics such as a large use temperature range, a high specific heat capacity, and good heat exchange performance, and can store heat. When heat is needed, the stored heat is conducted through heat exchange for use.

[0060] The heat-conducting flexible bag 51 is arranged as an annular belt connected end to end, and the annular belt and the driving roller group distributed on its inner side form a belt drive structure, so that the heat-conducting flexible bag 51 rotates in contact with the coil assembly 2 and the electric heater 3. The driving roller group is arranged inside the furnace body 1 and is rotatably connected to the inner wall of the furnace body 1. It should be noted that the setting of the driving roller group needs to not interfere with other structures inside the furnace body 1. The heat-conducting flexible bag 51 is sleeved outside the driving roller group. An existing driving structure can be used to drive the driving roller group to rotate. This embodiment exemplifies a driving structure: driving the driving roller group to rotate through a driving device such as a motor, and connecting the driving roller group with a belt, pulley drive structure or sprocket, chain drive structure to realize the co-rotation of the driving roller group. The rotation of the driving roller group drives the heat-conducting flexible bag 51 to rotate through friction, as shown in Figure 2 and Figure 4 shown, the heat-conducting flexible bag 51 on the left rotates counterclockwise, and the heat-conducting flexible bag 51 on the right rotates clockwise.

[0061] And a plurality of inner support blocks 52 for supporting its inner cavity are fixed in the heat-conducting flexible bag 51. The part of the heat-conducting flexible bag 51 close to the electric heater 3 is in contact with the outer surfaces of the electric heating tubes 4 and the heat-conducting reinforcement plate 6 to heat the powdery molten salt in the heat-conducting flexible bag 51. The heat-conducting flexible bag 51 is made of a flexible material and can be in contact with both the electric heating tubes 4 and the heat-conducting reinforcement plate 6. The part of the heat-conducting flexible bag 51 close to the coil assembly 2 is in contact with the outer surface of the coil 21 to transfer the heat of the powdery molten salt to the coil 21;

[0062] The heat-conducting flexible bag 51 is made of a flexible material with good heat conductivity, such as:

[0063] ①Thermal conductive silicone rubber: It is a common flexible heat-conducting material, and its heat-conducting performance can be improved by adding heat-conducting powder. For example, by optimizing the selection, shape, and grading of the heat-conducting powder, the steric hindrance caused by powder accumulation can be reduced, thereby improving the heat-conducting performance of the thermal conductive silicone rubber;

[0064] ②Graphene-based materials: Graphene is a material with excellent heat-conducting performance, and its thermal conductivity is as high as about 1200 W / mK. By compounding graphene with other materials, materials with high heat conductivity and flexibility can be prepared. For example, the team of Professor Li Baowen at Southern University of Science and Technology prepared stable LM@GNLiquid metal@Graphenenanosheet coated droplets through ultrasonic treatment. The π-π interaction between GN and ANFAramid nanofiber enables the LM@GN filler to be evenly dispersed in the LM@GN / ANF film to form a good heat-conducting network, and the film achieves a high thermal conductivity of 5.67 W•m-1K-1;

[0065] ③Carbon nanofiber CNF and carbon nanotube CNT composite materials: The University of Tokyo and the National Institute of Advanced Industrial Science and Technology in Japan developed a rubber composite material that is as soft as rubber and has a thermal conductivity comparable to that of metals 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 14 W / mK in the direction of the aligned CNF;

[0066] ④Flexible graphene heat-conducting film: The ultra-flexible graphene heat-conducting film developed by Morre Technology has excellent properties such as high heat conductivity, high flexibility, light weight, and strong thermal stability. The heat-conducting film can achieve large heat transfer across the screen. After more than 500,000 180° opening and closing bends, the heat-conducting performance loss is <1%, and it hardly decreases.

[0067] During heating, the electric heater 3 is set to medium or high temperature heating. The heat-conducting flexible bag 51 rotates along the surface of the electric heating tube 4. The heat is transferred to the molten salt through the heat-conducting flexible bag 51. After the molten salt stores heat, it exchanges heat with the medium in the coil 21 through the coil 21, realizing the heating of the medium. The molten salt after heat exchange then rotates to the electric heating tube 4 to be heated and then passes through the coil 21 to heat the coil 21. This cycle is repeated to continuously transfer the heat to the coil 21, so that the molten salt at the coil 21 always maintains the temperature, that is, the molten salt can replenish the heat in time to heat the medium, thereby realizing continuous flow and heat replenishment heating of the medium in the coil 21, with less heat loss and stable and reliable heating.

[0068] At the same time, as Figures 1 to 3As shown, an air inlet pipe 14 and an air outlet pipe 15 are respectively fixed at the bottom and top of the furnace body 1. Valves need to be installed on both the air inlet pipe 14 and the air outlet pipe 15 to facilitate the introduction of heat-conducting gas into the furnace body 1. The heat-conducting gas can be hydrogen, which is a very good heat-conducting medium and has better heat-conducting performance than most other gases. The heat-conducting performance of hydrogen is mainly determined by its molecular structure and molecular motion characteristics. A hydrogen molecule is composed of two hydrogen atoms, each hydrogen atom has a nucleus and an electron, and the hydrogen molecule transfers heat energy by moving between molecules, that is, transferring heat energy from one molecule to another through collisions. Due to the small size and light mass of hydrogen molecules, the intermolecular interaction force is very small, resulting in good heat-conducting performance of hydrogen. Since the density of hydrogen is less than that of air, hydrogen enters the furnace body 1 from the air inlet pipe 14 and pushes the air in the furnace out from the air outlet pipe 15, filling the furnace body 1 with hydrogen.

[0069] After the heat-conducting gas enters the furnace body 1, it is heated. 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, making the heating uniform, and improving the heating efficiency.

[0070] Since the molten salt in the present invention does not directly fill the furnace body 1, there is no need to worry about the problem of the molten salt solidifying on the furnace body 1, thus avoiding the problems existing in the traditional heating furnace when directly injecting the molten salt into the furnace due to incomplete drainage of the molten salt or the transportation of the molten salt through pipelines.

[0071] In addition, to facilitate the disassembly and maintenance of the coil assembly 2, as Figures 1 - 4 、 Figure 6 and Figure 7 shown, a slideway assembly 8 for supporting the coil assembly 2 is provided at the bottom of the coil assembly 2. The slideway assembly 8 includes a plurality of longitudinals 81 horizontally distributed, and a plurality of crossbeams 82 are fixed between the plurality of longitudinals 81. The lengths of the two longitudinals 81 on both sides are greater than the length of the middle longitudinal 81, and pads 83 are fixed at the front and rear ends of the two longitudinals 81 on both sides. The pads 83 are fixed to the inner wall of the furnace body 1, and support ribs 84 are fixed between the bottom of the pads 83 and the longitudinals 81. The heat-conducting flexible bag 51 is located between the two longitudinals 81 on both sides and outside the middle longitudinal 81, and the slideway assembly 8 does not hinder the rotation of the heat-conducting flexible bag 51; a support seat 7 is fixed at the bottom end of the coil 21, the support seat 7 is arranged on the top of the slideway assembly 8, and the support seat 7 is slidably connected with the slideway assembly 8 through a first slideway 9.

[0072] Installation openings are also provided on both sides of the furnace body 1, and installation cylinders 12 are fixed on the outer sides of the installation openings. The coil pipe 21 extends out of one side of the furnace body 1 through one of the installation cylinders 12, and a first mounting plate 13 connected to the installation cylinder 12 is fixed on the coil pipe 21. The installation cylinder 12 and the first mounting plate 13 are fixed by bolts, and there is also a sealing gasket for sealing between the installation cylinder 12 and the first mounting plate 13.

[0073] After unscrewing the bolts on the first mounting plate 13, pull the coil assembly 2 outwards. The support base 7 of the coil assembly 2 can slide along the slideway assembly 8, which is convenient for the coil assembly 2 to be pulled out of the furnace body 1 for maintenance.

[0074] At the same time, in order to facilitate the disassembly and maintenance of the electric heater 3, as Figure 1 、 Figure 2 and Figure 4 shown, a first support frame 10 is fixed at the inner bottom end of the furnace body 1. The first support frame 10 is arranged at the bottom end of the electric heating tube 4 to support the electric heating tube 4, and the heat-conducting reinforcement plate 6 outside the electric heating tube 4 is slidably connected to the first support frame 10 through a second slideway 11. The electric heater 3 extends out of the other side of the furnace body 1 through another installation cylinder 12, and a second mounting plate 16 connected to the installation cylinder 12 is fixed on the electric heater 3. The installation cylinder 12 and the second mounting plate 16 are fixed by bolts, and there is also a sealing gasket for sealing between the installation cylinder 12 and the second mounting plate 16.

[0075] After unscrewing the bolts on the second mounting plate 16, pull the electric heater 3 outwards. The heat-conducting reinforcement plate 6 can slide along the first support frame 10, which is convenient for the electric heater 3 to be pulled out of the furnace body 1 for maintenance.

[0076] It should be noted that in order to prevent the heat-conducting flexible bag 51 from loosening, two tensioners need to be installed on the inner wall of the furnace body 1, as Figure 2 and Figure 4 shown. The tensioners are located outside the heat-conducting flexible bag 51 to tension the heat-conducting flexible bag 51. For example, they can prevent the heat-conducting flexible bag 51 from loosening after the coil assembly 2 and the electric heater 3 are pulled out.

[0077] The maintenance of the coil assembly 2 and the electric heater 3 occurs after the heating operation is completed. At this time, open the upper gas pipe 15 to discharge the heat-conducting gas, which can be recycled through the heat recovery device. There is still residual heat in the furnace body 1, making the pressure inside 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 inside the furnace body 1 will push the coil assembly 2 and the electric heater 3 outwards, making it easier for personnel to perform maintenance work.

[0078] It is understandable that the above embodiments are merely exemplary embodiments adopted to illustrate the principles of the present invention. However, 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 regarded as the protection scope 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, the heat-renewal component 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 heat-conducting flexible bag, in which powdered molten salt is filled, so that the heat-conducting 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 continuously flow and heat the medium flowing in the coil assembly; The thermally conductive flexible bag is configured as an annular belt connected end to end; The heat-renewal component further comprises a transmission roller group rotatably connected to the inner wall of the furnace body, the transmission roller group is arranged inside the thermally conductive flexible bag, and the two form a belt transmission structure; 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.

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 any one of claims 1 to 2, 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.

4. The medium-high temperature electric heating furnace according to claim 3, 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.

5. The medium-high temperature electric heating furnace according to claim 4, characterized in that: The bottom of the coil assembly is provided with a slideway assembly for supporting the coil assembly; The slideway 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.

6. The medium-high temperature electric heating furnace according to claim 5, 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.

7. The medium-high temperature electric heating furnace according to claim 6, 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 other mounting tube is fixed on the electric heater.

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