Electric roller kiln

Abstract

The utility model relates to an electric roller kiln, comprising a kiln body, a bracket is arranged at the lower part of the kiln body, a transport roller is installed at the upper end of the bracket, the transport roller is used to carry and transport the materials to be fired, a preheating zone, a high temperature zone and a cooling zone are arranged in sequence and adjacent to each other in the kiln body, an electric heating plate is installed in the kiln body, the length of the electric heating plate matches the length of the high temperature zone, the electric heating plate is electrically connected to a temperature control device, and is used to heat the materials to be fired in the high temperature zone; the kiln body comprises a heat conducting layer and a heat insulating layer, the heat insulating layer is arranged outside the heat conducting layer and an isolation cavity is arranged between the heat conducting layer, a water circulation system is arranged in the isolation cavity, and the water circulation system is distributed in the preheating zone, the high temperature zone and the cooling zone of the kiln body. The utility model adopts an electric heating method, the heating temperature is high and the temperature is controllable, it is environmentally friendly and pollution-free, and zero emissions are achieved. By setting a water circulation system, the waste heat can be recycled to achieve energy-saving effects.

Description

Technical Field

[0001] The utility model relates to the technical field of kilns, in particular to an electric roller kiln. Background Art

[0002] The roller kiln is a tunnel kiln with a narrow cross section. Unlike the kiln car tunnel kiln, it does not use a kiln car loaded with products to operate, so the kiln roof structure is a flat ceiling type. The "roller table" is composed of rollers arranged in parallel and crossing the cross section of the kiln working channel. The products are placed on the roller table and transported into the kiln as the rollers rotate, completing the firing process in the kiln.

[0003] Most existing roller kilns use open flame heating. The combustion chamber is located below the conveyor rollers, and compressed air is used to atomize heavy oil, diesel, kerosene and other fuels for combustion. Some use the gas produced by the gasifier for combustion. The larger roller kilns all use a two-stage cold gas station, which uses cold gas for combustion to generate high temperature. There is a refractory material between the combustion chamber and the roller, so the flame does not directly contact the product being burned. Relatively speaking, the cost of the gasifier supporting the archless kiln is lower than that of heavy oil, diesel, etc., and it is more efficient than direct coal combustion and meets environmental protection standards. When using heavy oil as fuel, in order to prevent smoke from polluting the product, flame isolation or semi-flame isolation should be adopted.

[0004] For example, the roller kiln device for firing lithium carbonate material disclosed in Chinese patent CN216523029U includes a kiln body; a conveying roller, which is used to convey lithium carbonate material bricks; the conveying roller includes a plurality of rollers arranged in parallel, and the rollers are made of high-aluminum material; a gas pipeline, which is arranged in the kiln body and is used to convey fuel; a burner assembly, which is connected to the gas pipeline, and the burner assembly includes a plurality of short-flame burners and a plurality of long-flame burners, and the plurality of short-flame burners and long-flame burners are dispersed in the kiln body.

[0005] The above-mentioned existing technical solutions have the following defects: the utilization of heat is not complete, the utilization rate is low, resulting in a waste of fuel; the roller kiln heated by open flame will produce a large amount of combustion exhaust gas emissions, which does not meet environmental protection standards, and the flue gas pollution may also affect the quality of the fired products; in addition, the temperature of the open flame is approximately between 700°C and 2000°C, and the temperature of the flame core is relatively low, and the temperature of the edge flame is relatively high. Therefore, in the production of products, the temperature of the flame is erratic, which can easily lead to uneven heating of the products. Moreover, for example, the production of artificial graphite negative electrodes requires a high temperature of 2000°C to 3000°C, and open flame heating still has the problem of insufficient temperature.

[0006] In view of this, the utility model provides an electric roller kiln, which adopts electric heating, has high and controllable heating temperature, is environmentally friendly and pollution-free, and achieves zero emissions. By setting up a water circulation system, waste heat can be recycled to achieve energy-saving effects. Utility Model Content

[0007] The utility model aims to provide an electric roller kiln to solve the deficiencies in the prior art. The technical problem to be solved by the utility model is achieved through the following technical solutions.

[0008] An electric roller kiln comprises a kiln body, a bracket is arranged at the lower part of the kiln body, a transport roller is installed at the upper end of the bracket, the transport roller is used to carry and transport materials to be fired, a preheating zone, a high temperature zone and a cooling zone are arranged adjacent to each other in sequence in the kiln body, an electric heating plate is installed in the kiln body, the length of the electric heating plate matches the length of the high temperature zone, the electric heating plate is electrically connected to a temperature control device, and is used to heat the materials to be fired in the high temperature zone; the kiln body comprises a heat conducting layer and a heat insulating layer, the heat insulating layer is arranged outside the heat conducting layer and an isolation cavity is arranged between the heat conducting layer, a water circulation system is arranged in the isolation cavity, and the water circulation system is distributed in the preheating zone, the high temperature zone and the cooling zone of the kiln body.

[0009] Preferably, the electric heating plate comprises a bottom heating plate and an upper heating plate, the bottom heating plate is fixedly installed below the transport roller, the upper heating plate is installed above the transport roller, and the height of the upper heating plate from the transport roller is adjustable.

[0010] Preferably, both ends of the bottom heating plate are fixedly mounted on a bracket below the transport roller via fixed connectors.

[0011] Preferably, a slide rail is installed on the inner wall of the heat-conducting layer, and the left and right ends of the upper heating plate are respectively slidably connected to the slide rail.

[0012] Preferably, the water circulation system comprises a circulating water pipe, which is arranged in the isolation cavity and distributed in the preheating zone, the high temperature zone and the cooling zone.

[0013] Preferably, the water inlet end of the circulating water pipe in the preheating zone is connected with the water outlet end of the circulating water pipe in the high temperature zone inside the kiln body, the water outlet end of the circulating water pipe in the preheating zone is connected with the water inlet end of the circulating water pipe in the cooling zone outside the kiln body, and the water outlet end of the circulating water pipe in the cooling zone is connected with the water inlet end of the circulating water pipe in the high temperature zone inside the kiln body.

[0014] Preferably, a circulation pump I is provided between the water outlet end of the circulating water pipe in the cooling zone and the water inlet end of the circulating water pipe in the high temperature zone.

[0015] Preferably, a circulation pump II is provided between the water outlet end of the circulation water pipe in the preheating zone and the water inlet end of the circulation water pipe in the cooling zone.

[0016] Preferably, the insulation layer is made of refractory insulation bricks.

[0017] In the utility model, an electric heating plate is used to heat the material to be fired in the high-temperature zone. Compared with the open flame heating method, the heating temperature is more controllable, and no exhaust gas is generated, thereby achieving zero emission and being more environmentally friendly. The provision of the thermal insulation layer can improve the thermal insulation performance of the entire kiln body and reduce the heat loss to the outside of the kiln body. The water circulation system is provided in the isolation cavity between the thermal insulation layer and the heat-conducting layer, and is distributed in the preheating zone, the high-temperature zone and the cooling zone of the kiln body. The circulating water pipe in the preheating zone is connected to the circulating water pipe in the cooling zone after passing outside the kiln body, the circulating water pipe in the cooling zone is connected to the circulating water pipe in the high-temperature zone in the kiln body, and the circulating water pipe in the high-temperature zone is also connected to the circulating water pipe in the preheating zone in the kiln body. The water in the preheating zone is pumped into the pipeline outside the kiln body by the circulation pump II, so that the water is completely cooled outside the kiln body before entering the cooling zone to cool down the cooling zone; after the cold water exchanges heat in the cooling zone, it takes away the residual heat in the cooling zone, and then enters the high temperature zone under the action of the circulation pump I. The hot water plays the role of wall insulation in the isolation cavity in the high temperature zone, and then continues to circulate into the preheating zone, exchanges heat with the cold air in the preheating zone in the preheating zone, helps the preheater to heat, and then the cooled water is pumped into the kiln body for cooling again, thus realizing the heat cycle. The setting of the water circulation system can not only realize the recycling of residual heat, but also not affect the temperature rise and fall in the kiln body too much, and ensure the relative independence of the water circulation system and the heating system in the kiln body, but also is more conducive to the temperature regulation of different areas in the kiln body.

[0018] In summary, compared with the prior art, the electric roller kiln provided by the utility model adopts electric heating, has high and controllable heating temperature, is environmentally friendly and pollution-free, and achieves zero emissions. By setting up a water circulation system, waste heat can be recycled to achieve energy-saving effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the structure of the utility model;

[0020] Figure 2 This is a schematic diagram of the structure of the water circulation system of the utility model;

[0021] The reference numerals in the accompanying drawings are: 1. kiln body, 11. heat conducting layer, 12. heat insulating layer, 13. isolation cavity, 131. preheating zone, 132. high temperature zone, 133. cooling zone, 2. bracket, 3. transport roller, 41. bottom heating plate, 42. fixed connecting part, 51. upper heating plate, 52. slide rail, 6. water circulation system, 61. circulating water pipe, 62. circulating pump I, 63. circulating pump II. DETAILED DESCRIPTION

[0022] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present utility model will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0023] Reference Figure 1 and Figure 2 As shown, an electric roller kiln, the improvement of which is that it includes a kiln body 1, a bracket 2 is arranged at the lower part of the kiln body 1, a transport roller 3 is installed at the upper end of the bracket 2, and the transport roller 3 is used to carry and transport the material to be fired, the kiln body 1 is provided with a preheating zone 131, a high temperature zone 132 and a cooling zone 133 arranged adjacent to each other in sequence, an electric heating plate is installed in the kiln body 1, the length of the electric heating plate matches the length of the high temperature zone 132, the electric heating plate is electrically connected to a temperature control device, and is used to heat the material to be fired in the high temperature zone 132; the kiln body 1 includes a heat conducting layer 11 and a heat insulating layer 12, the heat insulating layer 12 is arranged outside the heat conducting layer 11 and an isolation cavity 13 is arranged between the heat conducting layer 11, a water circulation system 6 is arranged in the isolation cavity 13, and the water circulation system 6 is distributed in the preheating zone 131, the high temperature zone 132 and the cooling zone 133 of the kiln body 1.

[0024] Furthermore, the water circulation system 6 includes a circulating water pipe 61 , which is disposed in the isolation cavity 13 and distributed in the preheating zone 131 , the high temperature zone 132 and the cooling zone 133 .

[0025] Furthermore, the water inlet end of the circulating water pipe 61 in the preheating zone 131 is connected with the water outlet end of the circulating water pipe 61 in the high temperature zone 132 in the kiln body 1, the water outlet end of the circulating water pipe 61 in the preheating zone 131 is connected with the water inlet end of the circulating water pipe 61 in the cooling zone 133 outside the kiln body 1, and the water outlet end of the circulating water pipe 61 in the cooling zone 133 is connected with the water inlet end of the circulating water pipe 61 in the high temperature zone 132 in the kiln body 1.

[0026] Furthermore, a circulation pump I62 is provided between the water outlet end of the circulation water pipe 61 in the cooling zone 133 and the water inlet end of the circulation water pipe 61 in the high temperature zone 132.

[0027] Furthermore, a circulation pump II63 is provided between the water outlet end of the circulation water pipe 61 in the preheating zone 131 and the water inlet end of the circulation water pipe 61 in the cooling zone 133 .

[0028] In this embodiment, an electric heating plate is used to heat the material to be fired in the high-temperature zone 132. Compared with the open flame heating method, the heating temperature is more controllable, and no exhaust gas is generated, achieving zero emission and being more environmentally friendly. The provision of the thermal insulation layer 12 can improve the overall thermal insulation performance of the kiln body 1 and reduce heat loss to the outside of the kiln body 1. The water circulation system 6 is arranged in the isolation cavity 13 between the thermal insulation layer 12 and the heat-conducting layer 11, and is distributed in the preheating zone 131, the high-temperature zone 132 and the cooling zone 133 of the kiln body 1. The circulating water pipe 61 of the preheating zone 131 passes outside the kiln body 1 and is connected to the circulating water pipe 61 of the cooling zone 133. The circulating water pipe 61 in the cooling zone 133 is connected to the circulating water pipe 61 in the high-temperature zone 132 in the kiln body 1, and the circulating water pipe 61 in the high-temperature zone 132 is also connected to the circulating water pipe 61 in the preheating zone 131 in the kiln body. The water in the preheating zone 131 is pumped into the pipeline outside the kiln body 1 through the circulation pump II63, so that the water enters the cooling zone 133 after being thoroughly cooled outside the kiln body 1, so as to cool down the cooling zone 133; after the cold water exchanges heat in the cooling zone 133, it takes away the residual heat in the cooling zone 133, and then enters the high temperature zone 132 under the action of the circulation pump I62, and the hot water plays the role of wall insulation in the isolation cavity 13 in the high temperature zone 132, and then continues to circulate into the preheating zone 131, and exchanges heat with the cold air in the preheating zone 131 in the preheating zone 131, and after helping the preheater 131 to heat, the cooled water is pumped into the outside of the kiln body 1 again for cooling, thus realizing the heat cycle. The setting of the water circulation system 6 can not only realize the recycling of residual heat, but also not affect the temperature rise and fall in the kiln body 1 too much, and ensure that the water circulation system and the heating system in the kiln body 1 are relatively independent, but also more conducive to the temperature regulation of different areas in the kiln body 1.

[0029] Furthermore, the insulation layer 12 is made of refractory insulation bricks.

[0030] Furthermore, the electric heating plate includes a bottom heating plate 41 and an upper heating plate 51, the bottom heating plate 41 is fixedly installed below the transport roller 3, the upper heating plate 51 is installed above the transport roller 3, and the height of the upper heating plate 51 from the transport roller 3 is adjustable.

[0031] In this embodiment, two upper and lower electric heating plates are provided to fully heat the space inside the kiln body 1 to ensure the roasting temperature; the height of the upper heating plate 51 from the transport roller 3 is adjustable, so that the heating distance for materials of different heights can be consistent and the same heating effect can be achieved.

[0032] Furthermore, both ends of the bottom heating plate 41 are fixedly mounted on the bracket 2 below the transport roller 3 via fixed connectors 42 .

[0033] Furthermore, a slide rail 52 is installed on the inner wall of the heat-conducting layer 11 , and the left and right ends of the upper heating plate 51 are slidably connected to the slide rail 52 , respectively.

[0034] It should be noted that the above detailed descriptions are exemplary and are intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the art to which the present application belongs.

[0035] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments described in the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should also be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0036] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the terms used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein.

[0037] In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product, or apparatus that includes a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units that are not explicitly listed or inherent to these processes, methods, products, or apparatuses.

[0038] For ease of description, spatially relative terms, such as "above", "above", "on the upper surface of", "above", etc., may be used herein to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" may include both "above" and "below". The device may also be positioned in other different ways, such as rotated 90 degrees or in other orientations, and the spatially relative descriptions used herein are interpreted accordingly.

[0039] In the above detailed description, reference is made to the accompanying drawings, which form a part of this document. In the accompanying drawings, similar symbols typically identify similar components unless the context indicates otherwise. The illustrated embodiments described in the detailed description, drawings, and claims are not meant to be limiting. Other embodiments may be used, and other changes may be made, without departing from the spirit or scope of the subject matter presented herein.

[0040] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. An electric roller kiln, characterized in that: The invention comprises a kiln body (1), wherein a support (2) is arranged at the lower part of the kiln body (1), and a transport roller (3) is installed at the upper end of the support (2), and the transport roller (3) is used to carry and transport materials to be fired; a preheating zone (131), a high temperature zone (132) and a cooling zone (133) are arranged in sequence in the kiln body (1); an electric heating plate is installed in the kiln body (1), and the length of the electric heating plate matches the length of the high temperature zone (132); and the electric heating plate is electrically connected to a temperature control device. The kiln body (1) is connected to a heat-conducting layer (11) and is used to heat the material to be fired in a high-temperature zone (132); the kiln body (1) comprises a heat-conducting layer (11) and a heat-insulating layer (12); the heat-insulating layer (12) is arranged outside the heat-conducting layer (11) and an isolation cavity (13) is arranged between the heat-conducting layer (11); a water circulation system (6) is arranged in the isolation cavity (13); and the water circulation system (6) is distributed in the preheating zone (131), the high-temperature zone (132) and the cooling zone (133) of the kiln body (1).

2. The electric roller kiln according to claim 1, characterized in that: The electric heating plate comprises a bottom heating plate (41) and an upper heating plate (51); the bottom heating plate (41) is fixedly installed below the transport roller (3); the upper heating plate (51) is installed above the transport roller (3); and the height of the upper heating plate (51) relative to the transport roller (3) is adjustable.

3. The electric roller kiln according to claim 2, characterized in that: Both ends of the bottom heating plate (41) are fixedly mounted on a bracket (2) below the transport roller (3) via fixed connectors (42).

4. The electric roller kiln according to claim 2, characterized in that: A slide rail (52) is installed on the inner wall of the heat-conducting layer (11), and the left and right ends of the upper heating plate (51) are respectively slidably connected to the slide rail (52).

5. The electric roller kiln according to claim 1, characterized in that: The water circulation system (6) comprises a circulating water pipe (61), wherein the circulating water pipe (61) is arranged in the isolation cavity (13) and distributed in the preheating zone (131), the high temperature zone (132) and the cooling zone (133).

6. The electric roller kiln according to claim 5, characterized in that: The water inlet end of the circulating water pipe (61) in the preheating zone (131) is connected to the water outlet end of the circulating water pipe (61) in the high temperature zone (132) in the kiln body (1); the water outlet end of the circulating water pipe (61) in the preheating zone (131) is connected to the water inlet end of the circulating water pipe (61) in the cooling zone (133) outside the kiln body (1); and the water outlet end of the circulating water pipe (61) in the cooling zone (133) is connected to the water inlet end of the circulating water pipe (61) in the high temperature zone (132) in the kiln body (1).

7. The electric roller kiln according to claim 6, characterized in that: A circulation pump I (62) is provided between the water outlet end of the circulation water pipe (61) in the cooling zone (133) and the water inlet end of the circulation water pipe (61) in the high temperature zone (132).

8. The electric roller kiln according to claim 6, characterized in that: A circulation pump II (63) is provided between the water outlet end of the circulation water pipe (61) in the preheating zone (131) and the water inlet end of the circulation water pipe (61) in the cooling zone (133).

9. The electric roller kiln according to claim 1, characterized in that: The thermal insulation layer (12) is made of refractory thermal insulation bricks.

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