CN210426088U

CN210426088U - Resistance furnace for roasting and carbonizing

Info

Publication number: CN210426088U
Application number: CN201921460343.0U
Authority: CN
Inventors: 侯汉江; 张学源; 侯汉宝
Original assignee: Qinghai Zhengfeng Lithium Ion Battery Material Co Ltd
Current assignee: Qinghai Zhengfeng Lithium Ion Battery Material Co Ltd
Priority date: 2019-09-04
Filing date: 2019-09-04
Publication date: 2020-04-28
Anticipated expiration: 2029-09-04

Abstract

The utility model discloses a resistance furnace for calcination and carbonization belongs to carbon element goods unburned bricks calcination technical field. The utility model comprises a U-shaped furnace body, wherein the furnace body is internally provided with an electric resistance material which is used for coating and filling around a product to be processed; and the two ends of the U-shaped opening side of the furnace body are respectively provided with a furnace head and a furnace tail, the furnace head and the furnace tail are respectively provided with a furnace head electrode and a furnace tail electrode which are contacted with the electric resistance material, and the furnace head electrode and the furnace tail electrode are respectively a positive electrode and a negative electrode. The utility model aims to overcome the calcination technique energy consumption cost of current carbon product too high, bake burning furnace function singleness not enough, provide a resistance furnace for calcination and carbonization, improve with the shape through arranging of stove, expanded the usage of stove, can effectively reduce the cost and the carbonization cost of carbon product calcination, reduce the manufacturing cost of lithium cell to a certain extent.

Description

Resistance furnace for roasting and carbonizing

Technical Field

The utility model relates to a carbon element goods unburned bricks calcination technical field, more specifically says, relates to a resistance furnace for calcination and carbonization.

Background

Conventional green carbon products must be subjected to a high temperature process, called firing, at a maximum temperature of about 1200 c in order to remove the binder (e.g., pitch volatiles) and thereby increase the strength and improve the electrical conductivity of the carbon product. Roasting has a plurality of modes, and most of the roasting of the carbon product green bodies is finished by a ring type roasting furnace at present, wherein the roasting of the ring type furnace uses gas fuels such as natural gas and the like as energy sources, and the ring type furnace has the defects of high unit consumption, long roasting period, high furnace building cost, high product roasting cost and the like.

In addition, with the factors of technical progress, market demand and the like, medium and high-end cathode materials for lithium ion batteries need to be subjected to a carbonization process, the carbonization temperature is between 600 ℃ and 1200 ℃, the carbonization is usually carried out by using a kiln, such as a roller kiln, gas or electricity is used as an energy source for carbonization, and nitrogen is required to be introduced for atmosphere protection in the carbonization process. The carbonization mode has the defects of high energy consumption, complex process, high cost and the like. Therefore, how to design a resistance furnace to effectively reduce the roasting cost of carbon products and the carbonization cost of lithium battery negative electrode materials is very important.

Through retrieval, a large number of patents have been published on reducing the cost of carbon product roasting and carbonization of lithium battery negative electrode materials, such as chinese patent application No.: 2019100978411, the name of invention creation is: the application discloses an application of a graphitization furnace to a roasting process, and the graphitization furnace is used for the roasting process of a carbon material, wherein the graphitization furnace comprises at least one furnace body; the periphery of the furnace body is provided with a refractory furnace wall, and the bottom of the furnace body is paved with a cushion layer; a first resistance material is laid above the cushion layer; products to be treated are placed above the first resistance material, and resistance materials are filled in the products to be treated and between the products to be treated; a second resistance material is laid above the product to be treated; a furnace top heat preservation material layer is laid above the second resistance material. The scheme is a good exploration for low cost of carbon product roasting and lithium battery negative electrode material carbonization, but still has a further promotion space, and research on cost reduction of carbon product roasting and lithium battery negative electrode material carbonization in the industry has never been stopped.

SUMMERY OF THE UTILITY MODEL

1. Technical problem to be solved by the utility model

The utility model aims to overcome the calcination technique energy consumption cost of current carbon product too high, bake burning furnace function singleness not enough, provide a resistance furnace for calcination and carbonization, improve with the shape through arranging of stove, expanded the usage of stove, can effectively reduce the cost and the carbonization cost of carbon product calcination, reduce the manufacturing cost of lithium cell to a certain extent.

2. Technical scheme

In order to achieve the above purpose, the utility model provides a technical scheme does:

the utility model discloses a resistance furnace for roasting and carbonizing, which comprises a furnace body with a U-shaped structure, wherein resistance materials are arranged in the furnace body and used for coating and filling around a product to be processed; and the two ends of the U-shaped opening side of the furnace body are respectively provided with a furnace head and a furnace tail, the furnace head and the furnace tail are respectively provided with a furnace head electrode and a furnace tail electrode which are contacted with the electric resistance material, and the furnace head electrode and the furnace tail electrode are respectively a positive electrode and a negative electrode.

As a further improvement, the inner wall of the furnace body is inwards provided with a mixture layer and a heat preservation material layer in sequence, wherein the mixture in the mixture layer is the mixture of quartz sand and carbon black, and the heat preservation material in the heat preservation material layer is calcined petroleum coke.

As a further improvement of the utility model, the particle size range of the heat-insulating material in the heat-insulating material layer is 0-5 mm.

As a further improvement of the utility model, the electric resistance material adopts calcined petroleum coke with the grain diameter range of 5-30 mm.

As a further improvement of the utility model, the inner wall around the furnace body is a furnace wallboard which is formed by splicing a plurality of refractory plates.

As a further improvement, the utility model discloses connect through the channel-section steel between two adjacent refractory slabs, positioning groove has all been seted up to the both sides of channel-section steel, and two adjacent refractory slabs cooperate the card respectively to go into in the positioning groove of channel-section steel both sides.

As a further improvement of the utility model, the furnace end electrode and the furnace tail electrode are respectively connected with the anode and the cathode of the rectifier transformer direct current power supply.

As a further improvement of the utility model, a plurality of furnace end electrodes are arranged on the furnace end at intervals, and furnace tail electrodes with the same quantity as the furnace end electrodes are correspondingly arranged on the furnace tail.

3. Advantageous effects

Adopt the technical scheme provided by the utility model, compare with prior art, have following beneficial effect:

(1) compared with the traditional linear structure, the U-shaped structural design of the furnace body of the resistance furnace for roasting and carbonizing not only reduces the length of a construction land, but also saves copper and aluminum wires; adopt traditional sharp stove type, because furnace end and stove tail are located the left and right sides of sharp stove type respectively, need use a large amount of copper aluminium to arrange, and the U type resistance furnace of this scheme of adoption, furnace end and stove tail are located resistance furnace with one side, the transformer is located the furnace end next door this moment, the quantity that copper aluminium was arranged can be saved more than half, has reduced resistance furnace's construction cost greatly, has improved economic benefits.

(2) The utility model discloses a resistance furnace for calcination and carbonization not only can realize the calcination of carbon element goods unburned bricks alone and the carbonization to lithium electricity negative electrode material, can also accomplish the calcination of carbon element goods unburned bricks simultaneously and the carbonization to lithium electricity negative electrode material, and the function is diversified more. Because the arrangement in the furnace is the same as roasting during carbonization, when roasting of the carbon product green body and carbonization of the lithium battery negative electrode material are completed simultaneously, only the material to be carbonized (such as the lithium battery negative electrode asphalt coating material, the common grain diameter is micron order) needs to be loaded into the carbon product green body, and the carbonization can be completed when the temperature is fired to be above 550 ℃. When the temperature is continuously increased to reach the roasting temperature of 1200 ℃, the roasting and carbonization are integrated, the economic benefit is improved, and the production cost is reduced.

(3) The utility model discloses a resistance furnace for calcination and carbonization, with the positive negative pole of power respectively with furnace end electrode and stove tail electrode switch-on, resistance material this moment just is equivalent to resistance, supplies power to the resistance material in the furnace body through the power, and the electric current passes through resistance material and produces the heat, compares with traditional calcination technology, becomes electric power with the energy consumption mode of calcination by traditional gas, not only the environmental protection, and the power consumption is few, has reduced manufacturing cost.

(4) The utility model discloses a resistance furnace for calcination and carbonization treats that the cladding has resistance material around the processing goods, through the mode that resistance material generates heat for it is all relatively more even to treat the processing goods temperature of being heated, greatly improves the calcination and treats the yield of processing goods, has improved economic benefits.

Drawings

FIG. 1 is a schematic structural view of a resistance furnace for calcination and carbonization according to the present invention;

FIG. 2 is a schematic perspective view of a resistance furnace for calcination and carbonization according to the present invention;

fig. 3 is a schematic structural view of the middle furnace wall plate of the present invention.

The reference numerals in the schematic drawings illustrate:

100. a furnace body; 110. a furnace wall panel; 111. a refractory plate; 112. channel steel; 120. mixing a material layer; 130. a heat preservation material layer; 140. resistance materials; 150. a product to be processed; 200. a furnace end; 210. a furnace end electrode; 300. a furnace tail; 310. and a furnace tail electrode.

Detailed Description

For a further understanding of the present invention, reference will be made to the following detailed description taken in conjunction with the accompanying drawings.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

The present invention will be further described with reference to the following examples.

Example 1

With reference to fig. 1 to fig. 3, the resistance furnace for roasting and carbonizing of the present embodiment includes a furnace body 100 in a U-shaped structure, a resistance material 140 is disposed in the furnace body 100, a product 150 to be processed is disposed in the furnace body 100, the resistance material 140 is used to cover and fill around the product 150 to be processed, and the product 150 to be processed may be a green carbon product, a lithium battery negative electrode material, or both a green carbon product and a lithium battery negative electrode material; and the two ends of the U-shaped opening side of the furnace body 100 are respectively provided with the furnace head 200 and the furnace tail 300, the furnace head 200 and the furnace tail 300 are respectively provided with the furnace head electrode 210 and the furnace tail electrode 310 which are contacted with the resistance material 140, wherein the furnace head electrode 210 and the furnace tail electrode 310 are respectively a positive electrode and a negative electrode, the positive electrode and the negative electrode of a power supply are respectively communicated with the furnace head electrode 210 and the furnace tail electrode 310, the resistance material 140 at the moment is equivalent to a resistor, the power supply supplies power to the resistance material 140 in the furnace body 100, and the current generates heat through the resistance material 140, compared with the traditional roasting process, the energy consumption mode of roasting is changed from the traditional gas into electricity, thereby not only protecting the environment, but also reducing the energy consumption and the production cost, and the resistance material 140 is filled between two products to be processed 150 which are connected, and the products to be processed 150 are heated at a more uniform temperature by, the economic benefit is improved. Compared with the traditional linear structure, the U-shaped structural design of the furnace body 100 in the embodiment not only reduces the length of a building block, but also saves copper and aluminum wires. Traditional straight line stove type is because furnace end 200 and stove tail 300 are located the left and right sides of straight line stove type respectively, need use a large amount of copper aluminium to arrange, and adopt the U type resistance furnace of this embodiment, furnace end 200 and stove tail 300 are located the same one side of resistance furnace, and the transformer is located furnace end 200 next door this moment, and the quantity of copper aluminium row can be saved more than half, has reduced the construction cost of resistance furnace greatly, has improved economic benefits.

As shown in fig. 1, in this embodiment, a mixture layer 120 and a thermal insulation layer 130 are sequentially disposed inward on the inner wall of the furnace body 100, wherein the mixture in the mixture layer 120 is a mixture of quartz sand and carbon black, the thermal insulation material in the thermal insulation layer 130 is calcined petroleum coke, and the particle size range of the calcined petroleum coke is 0-5mm, and the thermal insulation layer 130 is disposed for saving energy and protecting the furnace wall due to the high final calcination temperature; the electric resistance material 140 adopts calcined petroleum coke with the grain size range of 5-30 mm.

As shown in fig. 1, in the present embodiment, the furnace head electrode 210 and the furnace tail electrode 310 are respectively connected to the positive electrode and the negative electrode of the rectifier transformer dc power supply. Specifically, according to actual use conditions on site, multiple sets of positive and negative electrodes are selected, that is, multiple furnace end electrodes 210 are arranged on the furnace end 200 at intervals, and furnace tail electrodes 310 with the same number as the furnace end electrodes 210 are correspondingly arranged on the furnace tail 300. The arrangement of the plurality of groups of positive and negative electrodes ensures the roasting requirement of the product 150 to be processed in the furnace, and can accelerate the roasting process. The specific roasting process comprises the following steps: the current flows from the positive electrode to the negative electrode (as shown by the arrow in fig. 1), the current generates heat through the resistance material 140 in the furnace, the furnace temperature is slowly increased from room temperature to 1200 ℃ (about 10 days are generally needed), and the green carbon product 150 is subjected to a process of firing the green carbon product 150 at a high temperature of about 1200 ℃ to obtain a mature carbon product, i.e., the firing process is completed.

As shown in fig. 3, the inner walls of the furnace body 100 are made of furnace wall plates 110, and the furnace wall plates 110 are formed by splicing a plurality of refractory plates 111. Specifically, connect through channel-section steel 112 between two adjacent refractory slabs 111 in this embodiment, positioning groove has all been seted up to channel-section steel 112's both sides, and two adjacent refractory slabs 111 cooperate respectively to block in the positioning groove of channel-section steel 112 both sides, and the both ends of refractory slab 111 cooperate respectively to block in the positioning groove, and the thickness of refractory slab 111 matches with positioning groove's width phase-match, and the furnace wall board 110 firm in connection through this mode equipment, and refractory slab 111 changes more conveniently.

The resistance furnace of this embodiment not only can realize the calcination of carbon product unburned bricks alone and the carbonization to lithium electricity negative electrode material, can also accomplish the calcination to carbon product unburned bricks simultaneously and the carbonization to lithium electricity negative electrode material, and the function is diversified more. Because the arrangement in the furnace is the same as roasting during carbonization, when roasting of the carbon product green body and carbonization of the lithium battery negative electrode material are completed simultaneously, only the material to be carbonized (such as the lithium battery negative electrode asphalt coating material, the common grain diameter is micron order) needs to be loaded into the carbon product green body, and the carbonization can be completed when the temperature is fired to be above 550 ℃. When the temperature is continuously increased to reach the roasting temperature of 1200 ℃, the roasting and carbonization are integrated, the economic benefit is improved, and the production cost is reduced.

Most of the existing furnaces are not designed for carbonization and roasting, but are used for graphitization at 3000 ℃, the furnaces are short and wide, belong to a linear furnace type, and the power of the configured transformer is very high, and the large horse-drawn trolley is used for carbonization and roasting. The furnace type with the U-shaped structure is adopted in the embodiment, the furnace type is longer in length and smaller in width, so that the power of the configured transformer is smaller, and the investment cost of the transformer is reduced. The power of the transformer adopted in the roasting and carbonizing integrated resistance furnace of the embodiment is smaller, the cost is only about 3000, and the manufacturing cost is greatly reduced. In addition, the resistance furnace of the embodiment can be provided with about 2000 crucibles (one of the carbon product green bodies) at one time, the capacity is very large, and the carbonization and roasting are completed by adopting the graphitization furnace, so that the equipment is wasted, the yield is reduced, and the repayment is not carried out.

The present invention and its embodiments have been described above schematically, and the description is not limited thereto, and what is shown in the drawings is only one of the embodiments of the present invention, and the actual structure is not limited thereto. Therefore, if the person skilled in the art receives the teaching of the present invention, without departing from the inventive spirit of the present invention, the person skilled in the art should also design the similar structural modes and embodiments without creativity to the technical solution, and all shall fall within the protection scope of the present invention.

Claims

1. A resistance furnace for firing and carbonizing, characterized by: the furnace comprises a furnace body (100) in a U-shaped structure, wherein a resistance material (140) is arranged in the furnace body (100), and the resistance material (140) is used for coating and filling the periphery of a product (150) to be processed; and the two ends of the U-shaped opening side of the furnace body (100) are respectively provided with a furnace head (200) and a furnace tail (300), the furnace head (200) and the furnace tail (300) are respectively provided with a furnace head electrode (210) and a furnace tail electrode (310) which are contacted with the electric resistance material (140), wherein the furnace head electrode (210) and the furnace tail electrode (310) are respectively a positive electrode and a negative electrode.

2. A resistance furnace for firing and carbonization as claimed in claim 1, characterized in that: the inner wall of the furnace body (100) is inwards provided with a mixed material layer (120) and a heat preservation material layer (130) in sequence, wherein the mixed material in the mixed material layer (120) is a mixture of quartz sand and carbon black, and the heat preservation material in the heat preservation material layer (130) is calcined petroleum coke.

3. A resistance furnace for firing and carbonization as claimed in claim 2, characterized in that: the particle size range of the heat preservation material in the heat preservation material layer (130) is 0-5 mm.

4. A resistance furnace for firing and carbonization as claimed in claim 1, characterized in that: the electric resistance material (140) adopts calcined petroleum coke with the grain size range of 5-30 mm.

5. A resistance furnace for firing and carbonization as claimed in claim 1, characterized in that: the inner wall around the furnace body (100) is a furnace wallboard (110), and the furnace wallboard (110) is formed by splicing a plurality of refractory plates (111).

6. A resistance furnace for firing and carbonization as claimed in claim 5, characterized in that: two adjacent refractory plates (111) are connected through channel steel (112), positioning grooves are formed in the two sides of the channel steel (112), and the two adjacent refractory plates (111) are respectively matched and clamped into the positioning grooves in the two sides of the channel steel (112).

7. A resistance furnace for firing and carbonization according to any of claims 1-6, characterized in that: the furnace head electrode (210) and the furnace tail electrode (310) are respectively connected with the positive pole and the negative pole of a rectifier transformer direct current power supply.

8. A resistance furnace for firing and carbonization as claimed in claim 7, characterized in that: a plurality of furnace end electrodes (210) are arranged on the furnace end (200) at intervals, and furnace tail electrodes (310) with the same number as the furnace end electrodes (210) are correspondingly arranged on the furnace tail (300).