Semi-continuous rotary furnace

Abstract

The utility model provides a semi-continuous rotary furnace. The semi-continuous rotary furnace comprises a furnace shell and a furnace pipe rotationally arranged in the furnace shell, a cavity is formed in the furnace shell, a bottom heat preservation layer is arranged on a bottom plate, forming the cavity, of the furnace shell, a side face heat preservation layer is arranged on the side wall, forming the cavity, of the furnace shell, and a resistance heating belt is arranged on the outer surface of the side face heat preservation layer on one side. Supporting parts which are detachably mounted on the furnace shell are arranged at the two ends of the furnace pipe, so that the furnace pipe is arranged in the cavity; an air pipe is arranged in the supporting part at one end, and a material opening is formed in the supporting part at the other end; a furnace cover is arranged on the furnace shell, and a furnace cover heat preservation layer is arranged on the inner surface of the furnace cover. One end of the furnace pipe is provided with the material port for feeding and discharging, and the other end of the furnace pipe is provided with the air pipe, so that semi-continuous feeding and discharging are realized, and the productivity can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of high-temperature heat treatment equipment, in particular to a semi-continuous rotary furnace suitable for processing carbon-based materials. Background Art

[0002] Carbon-based materials mainly refer to materials with carbon as the main body, including graphite, diamond, graphene, carbon nanotubes, fullerene (C60), carbon isotope C14, carbon fiber and its composite materials, which are mainly composed of carbon elements. In a broad sense, it also includes silicon carbide and its composite materials.

[0003] There are two types of existing carbon-based material processing equipment. The first type is a rotary kiln for continuous carbonization of sodium battery negative electrodes, as disclosed in patent application publication number CN119685039A. The heating furnace tube is rotatably mounted on a heating support seat, with the furnace head cover and furnace tail cover sealed at both ends of the heating furnace tube. The feed assembly passes through the furnace head cover and extends into the heating furnace tube, so that the crushed material can be transported to the guide assembly. As the heating furnace tube rotates, the material is evenly turned over and pushed forward. It has the characteristics of continuous feeding and discharging, self-crushing function, sufficient material turning, precise and controllable sintering time, and high cooling efficiency. However, it also has problems such as inaccurate temperature control, large internal space and complex structure of the equipment, tar accumulation, and impurity enrichment that is difficult to clean.

[0004] The second type is the vacuum furnace. Although the vacuum furnace can accurately control the temperature, the by-products produced during the processing of the target product have a greater impact on the vacuum furnace, which is unsustainable and has low production capacity. Utility Model Content

[0005] The purpose of the utility model is to provide a semi-continuous rotary kiln to avoid tar accumulation and improve production capacity.

[0006] The technical solution of the utility model is: a semi-continuous rotary kiln, comprising a furnace shell and a furnace core rotatably arranged in the furnace shell, a cavity is provided in the furnace shell, a bottom insulation layer is provided on the bottom plate of the furnace shell forming the cavity, a side insulation layer is provided on the side wall of the furnace shell forming the cavity, and a resistance heating belt is provided on the outer surface of the side insulation layer on one side; two ends of the furnace core are provided with support parts detachably mounted on the furnace shell, so that the furnace core is placed in the cavity; an air pipe is provided in the support part at one end, and a material port is provided in the support part at the other end; a furnace cover is provided on the furnace shell, and a furnace cover insulation layer is provided on the inner surface of the furnace cover.

[0007] Preferably, the bottom insulation layer and the side insulation layer are ceramic fiber cotton.

[0008] Preferably, a first transmission mechanism is provided on the outside of the furnace shell, a gear is provided on a supporting portion of the furnace, and the first transmission mechanism is drivingly connected to the gear.

[0009] Preferably, a turning plate inclined along the axial direction is provided in the furnace, and a plurality of the inclined turning plates are arranged on the circumference of the furnace; or a spirally extending turning plate is provided in the furnace.

[0010] Preferably, among the plurality of tilted turning plates, two adjacent turning plates are tilted in opposite directions.

[0011] Preferably, the support portion is provided with a K-type thermocouple for measuring the temperature inside the furnace, and the furnace shell is provided with a K-type thermocouple for measuring the side insulation layer.

[0012] Preferably, the furnace cover is opened and closed on the furnace shell by the cover opening mechanism.

[0013] Preferably, the cover opening mechanism includes a lifting frame, a lifting drive source, a push rod and a pry bar. The lifting frame is vertically arranged, one end of the push rod is slidably arranged on the lifting frame, the lifting drive source is used to drive the push rod to slide up and down on one end of the lifting frame, the other end of the push rod is connected to one end of the pry bar, the pry bar is hinged to the furnace shell, and the other end of the pry bar is connected to the furnace cover.

[0014] Preferably, the furnace core is provided with an outer layer and an inner layer, and the outer layer and the inner layer are spaced apart to form a cooling water interlayer.

[0015] Preferably, a three-way valve is provided on the support portion, the first interface of the three-way valve is connected to the air pipe, the second interface of the three-way valve is connected to the air source, and the third interface of the three-way valve is connected between the furnace and the side insulation layer through a pipeline.

[0016] Compared with the related art, the beneficial effects of the present invention are:

[0017] 1. After the first furnace product is processed, the utility model can be removed and replaced with a new furnace for processing, which shortens the time for loading and unloading materials between the two furnaces and the long waiting time for cooling, thereby improving production capacity;

[0018] Second, the utility model sets an air pipe at one end of the furnace, so that volatile components such as tar can be discharged smoothly from the air pipe during operation, avoiding tar accumulation and simplifying subsequent cleaning and maintenance work;

[0019] 3. The utility model uses ceramic fiber cotton for insulation, which greatly improves the insulation effect;

[0020] Fourth, the utility model uses a resistance heating belt, which is heated by a resistance wire and can be equipped with an electric control system with a temperature self-feedback adjustment mechanism, which can achieve precise temperature control with a temperature difference of less than ±5°C;

[0021] 5. The furnace core rotates in the cavity of the furnace shell, turning the material over and evenly distributing the temperature, which is beneficial to product quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 A schematic diagram of the three-dimensional structure of a semi-continuous rotary kiln provided by the utility model;

[0023] Figure 2 A side structural diagram of a semi-continuous rotary kiln provided by the present invention;

[0024] Figure 3 It is a three-dimensional perspective structural diagram of the furnace;

[0025] Figure 4 This is a schematic diagram of the perspective structure of the furnace;

[0026] Figure 5 Schematic diagram of placing the furnace on the cooling rack.

[0027] In the accompanying drawings: 1. furnace shell; 2. furnace core; 3. furnace cover; 4. bottom insulation layer; 5. cover opening mechanism; 51. lifting frame; 52. lifting drive source; 53. push rod; 54. pry bar; 6. first transmission mechanism; 7. air pipe; 8. K-type thermal couple; 9. side insulation layer; 10. resistance heating belt; 11. turning plate; 12. cooling rack; 13. second transmission mechanism; 14. support part; 15. material port; 16. gear; 17. furnace cover insulation layer. DETAILED DESCRIPTION

[0028] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments. It should be noted that the embodiments and features of the embodiments of the present invention may be combined unless they conflict. For ease of description, the words "upper," "lower," "left," and "right" appear below merely to indicate the directions of upper, lower, left, and right in the accompanying drawings and do not limit the structure.

[0029] like Figure 1 、 Figure 2 As shown, a semi-continuous rotary furnace provided in this embodiment includes a furnace shell 1, a furnace core 2, a furnace cover 3, a bottom insulation layer 4, a cover opening mechanism 5, a first transmission mechanism 6, an air pipe 7, a K-type thermal couple 8, a side insulation layer 9, and a resistance heating belt 10.

[0030] The furnace shell 1 is enclosed by a roof and has an open top, with a cavity inside. A bottom insulation layer 4 is provided on the floor of the cavity-forming furnace shell 1, and side insulation layers 9 are provided on the side walls of the cavity-forming furnace shell 1. A resistance heating tape 10 is provided on the outer surface of one side insulation layer 9. The bottom insulation layer 4 and the side insulation layers 9 are made of ceramic fiber wool.

[0031] The two ends of the furnace 2 are provided with support parts 14 that can be detachably mounted on the furnace shell 1, so that the furnace 2 is placed in the cavity. An air pipe 7 is provided in the support part 14 at one end, and a material port 15 is provided in the support part 14 at the other end. The air pipe 7 can be used to pass inert gas or process gas (such as nitrogen, carbon dioxide, water vapor, etc.). Figure 3 As shown, the support portion 14 on which the air pipe 7 is provided is sheathed with a gear 16. Figure 1 As shown, a first transmission mechanism 6 is provided outside the furnace shell 1, a gear 16 is provided on a support portion 14 of the furnace 2, and the first transmission mechanism 6 is drivingly connected to the gear 16. The first transmission mechanism 6 can be a motor, a pulley and a gear set.

[0032] A bracket (not numbered) is provided on the furnace shell 1, and the support portion 14 is rotatably fitted in the bracket. The furnace 2 is driven to rotate in the cavity by the first transmission mechanism 6, and the rotation speed is adjustable.

[0033] like Figure 3 、 Figure 4 As shown, the furnace 2 is an independent unit, and is internally provided with a flip plate 11 that is axially inclined or spirally extended. The flip plate 11 can prevent the material from pouring out of the material port 15 during processing. The material port 15 is used for loading and unloading materials and can also be used for exhaust. If the flip plate 11 is designed to be axially inclined, multiple flip plates 11 are arranged on the circumference of the furnace 2. Among the tilted flip plates 11, multiple flip plates 11 are arranged on the circumference of the furnace 2, and the tilt directions of two adjacent flip plates 11 are opposite.

[0034] Four sets of turning plates 11 are installed within the furnace 2. Adjacent sets of turning plates 11 are arranged in opposite directions and are approximately symmetrical along the axial centerline of the furnace 2. This allows the material to reciprocate along the furnace head, furnace tail, and furnace head when the furnace 2 rotates axially in a certain direction, achieving the effect of turning the material. This, in terms of product performance, facilitates the formation of a small and numerous pore structure.

[0035] like Figure 1 、 Figure 2 As shown, the support portion 14 is provided with a K-type thermocouple 8 for measuring the internal temperature of the furnace 2. The furnace shell 1 is provided with a K-type thermocouple 8 for measuring the side insulation layer 9.

[0036] In this embodiment, the cover opening mechanism 5 includes a lifting frame 51, a lifting drive source 52, a push rod 53 and a pry bar 54. The lifting frame 51 is arranged vertically, and one end of the push rod 53 is slidably arranged on the lifting frame 51. The lifting drive source 52 is used to drive the push rod 53 to slide up and down on one end of the lifting frame 51. The other end of the push rod 53 is connected to one end of the pry bar 54, and the pry bar 54 is hinged on the furnace shell 1, and the other end of the pry bar 54 is connected to the furnace cover 3. The lifting drive source 52 can be a cylinder. The drive of the furnace cover 3 is similar to that of a lever. By adjusting the stroke of the cylinder, the angle between the furnace cover 3 and the furnace shell 1 can be adjusted between 0° and 90°.

[0037] The cover opening mechanism 5 can also be a track arranged between the furnace cover 3 and the furnace shell 1, and the furnace cover 3 is lowered onto the furnace shell 1 by translation.

[0038] The furnace 2 may be provided with an outer layer and an inner layer, and a cooling water interlayer may be formed between the outer layer and the inner layer to achieve rapid cooling in the temperature reduction stage.

[0039] A three-way valve may be provided on the support portion 14, with a first port of the valve communicating with the gas pipe 7. A second port of the valve communicates with the gas source. A third port of the valve is connected via a pipe between the furnace 2 and the side insulation layer 9, enabling waste heat recovery under certain conditions.

[0040] If the furnace core 2 cools down in the furnace shell 1, it will affect the next furnace core 2 to start working, resulting in reduced production capacity. Figure 5 As mentioned above, the present invention is also provided with a cooling rack 12, on which a second transmission mechanism 13 is provided. When the internal temperature of the furnace liner 2 is around 400°C, the furnace liner 2 is taken out of the furnace shell 1 and placed on the cooling rack 12. The output end of the second transmission mechanism 13 is connected to the gear 16, so that the furnace liner 2 rotates axially at a certain rate on the cooling rack 12. In this way, the residual heat in the furnace liner 2 can be used to continue processing the product until it is completely cooled. At this time, a new furnace liner 2 can be placed in the furnace shell 1 for processing. While increasing production capacity, the residual heat in the furnace liner 2 can also be fully utilized to continue processing the product, realizing waste heat utilization.

[0041] In addition, the cooling rack 12 may be designed with a structure inclined along the axial direction of the furnace 2 , so that when the furnace 2 is placed on the structure, the material can be directly poured out of the furnace 2 .

[0042] Existing continuous rotary kilns are often heated with fuels such as natural gas and diesel, and have low temperature control accuracy (with a temperature difference of about ten degrees). The continuous rotary kiln of the present invention uses electric heating, which utilizes resistance heating to achieve heating. The continuous rotary kiln is also equipped with a self-feedback mechanism (purchased part) to adjust the output power and current (i.e., the heating power) according to the real-time temperature. For example, before use, a temperature value is preset. During use, if the actual temperature is lower than the set temperature, the power of the equipment will automatically increase, and the upper power limit will be the preset upper limit. If the design temperature is higher than the set temperature, the power of the equipment will automatically decrease, and the lower power limit will be the preset lower limit. As a result, the actual temperature of the equipment is accurately heated according to the preset temperature curve. The electric heating of the continuous rotary kiln of the present invention can achieve precise temperature control with a temperature difference of less than ±5°C.

[0043] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the description and drawings of the present invention, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A semi-continuous rotary furnace comprising a furnace shell (1), characterized in that: The invention also includes a furnace core (2) rotatably arranged in the furnace shell (1), wherein a cavity is provided in the furnace shell (1), a bottom insulation layer (4) is provided on the bottom plate of the furnace shell (1) forming the cavity, a side insulation layer (9) is provided on the side wall of the furnace shell (1) forming the cavity, and a resistance heating belt (10) is provided on the outer surface of the side insulation layer (9) on one side; both ends of the furnace core (2) are provided with support parts (14) detachably mounted on the furnace shell (1), so that the furnace core (2) is placed in the cavity; an air pipe (7) is provided in the support part (14) at one end, and a material port (15) is provided in the support part (14) at the other end; a furnace cover (3) is provided on the furnace shell (1), and a furnace cover insulation layer (17) is provided on the inner surface of the furnace cover (3).

2. The semi-continuous rotary kiln according to claim 1, characterized in that: The bottom insulation layer (4) and the side insulation layer (9) are ceramic fiber cotton.

3. The semi-continuous rotary kiln according to claim 1, characterized in that: A first transmission mechanism (6) is provided on the outside of the furnace shell (1), a gear (16) is provided on a support portion (14) of the furnace core (2), and the first transmission mechanism (6) is drivingly connected to the gear (16).

4. The semi-continuous rotary kiln according to claim 1, characterized in that: A turning plate (11) tilted in the axial direction is provided in the furnace (2), and a plurality of tilted turning plates (11) are arranged on the circumference of the furnace (2); or a spirally extending turning plate (11) is provided in the furnace (2).

5. The semi-continuous rotary kiln according to claim 4, characterized in that: Among the plurality of tilting plates (11) arranged tilted, two adjacent tilting plates (11) have opposite tilting directions.

6. The semi-continuous rotary kiln according to claim 1, characterized in that: The support portion (14) is provided with a K-type thermal couple (8) for measuring the internal temperature of the furnace core (2), and the furnace shell (1) is provided with a K-type thermal couple (8) for measuring the side insulation layer (9).

7. The semi-continuous rotary kiln according to claim 1, characterized in that: The furnace cover (3) is opened and closed on the furnace shell (1) via a cover opening mechanism (5).

8. The semi-continuous rotary kiln according to claim 7, characterized in that: The cover opening mechanism (5) comprises a lifting frame (51), a lifting drive source (52), a push rod (53) and a pry rod (54); the lifting frame (51) is vertically arranged; one end of the push rod (53) is slidably arranged on the lifting frame (51); the lifting drive source (52) is used to drive the push rod (53) to slide up and down on one end of the lifting frame (51); the other end of the push rod (53) is connected to one end of the pry rod (54); the pry rod (54) is hinged to the furnace shell (1); and the other end of the pry rod (54) is connected to the furnace cover (3).

9. The semi-continuous rotary kiln according to claim 1, characterized in that: The furnace (2) is provided with an outer layer and an inner layer, and the outer layer and the inner layer are spaced apart to form a cooling water interlayer.

10. The semi-continuous rotary kiln according to claim 1, characterized in that: A three-way valve is provided on the support portion (14), a first interface of the three-way valve is connected to the air pipe (7), a second interface of the three-way valve is connected to the air source, and a third interface of the three-way valve is connected between the furnace (2) and the side insulation layer (9) via a pipeline.

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