Graphite sagger electric-driven roasting furnace

Abstract

The utility model relates to the technical field of roasting furnaces, and particularly discloses a graphite sagger electrically-driven roasting furnace. The graphite sagger electric-drive roasting furnace comprises a furnace end, a furnace tail, a plurality of movable wallboards and a filling material, the furnace head, the furnace tail and the movable wallboards form a furnace body, and the furnace body is filled with the filler; the filling material comprises a heat preservation and heat conduction layer, a partition plate and an insulating layer which are vertically arranged downwards in sequence; the heat preservation and conduction layer comprises a graphite sagger layer, a resistance material layer and a heat preservation material layer which are sequentially arranged from inside to outside in a wrapping mode. The furnace head end and the furnace tail end are not provided with heat preservation material layers. Compared with a traditional ring type gas roasting furnace, the graphite sagger electric-driven roasting furnace has the advantages of being high in energy utilization rate, flexible in production, high in yield and free of generating a large amount of waste gas.

Description

Technical Field

[0001] The utility model relates to the technical field of roasting furnaces, in particular to a graphite sagger electric-driven roasting furnace. Background Art

[0002] With the rapid development of the new energy industry, the demand for anode materials, one of its key components, has also seen explosive growth. The importance of graphite saggers as carriers for key processes such as anode carbonization and graphitization has also become increasingly prominent. The sagger's roasting process, as the final process before the finished product, directly determines the quality of the product. Traditional roasting processes use ring-type gas roasting furnaces, which not only have low energy utilization and insufficient production flexibility, but also produce products that are prone to cracking. The waste gas generated is also detrimental to the environment.

[0003] Therefore, how to disclose a graphite sagger electric drive roasting furnace to avoid the above problems is a difficult problem to be solved urgently in this field. Utility Model Content

[0004] In view of this, the utility model provides a graphite sagger electric drive roasting furnace to solve the problems of low energy utilization, inflexible production, easy cracking of products and generation of large amounts of waste gas in existing ring gas roasting furnaces.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A graphite sagger electric-driven roasting furnace, comprising a furnace head, a furnace tail, a plurality of movable wall panels and fillers;

[0007] The furnace head, furnace tail and several movable wall panels constitute the furnace body, and the filling material is filled in the furnace body;

[0008] The filler comprises a heat-insulating and heat-conducting layer, a partition and an insulating layer arranged vertically downward in sequence;

[0009] The heat-insulating and heat-conducting layer comprises a graphite sagger layer, a resistance material layer and a heat-insulating material layer which are sequentially coated from the inside to the outside;

[0010] No insulation layer is provided at the furnace head and furnace tail ends.

[0011] Preferably, the number of the movable wall panels is 2 to 8, the thickness of each movable wall panel is independently 20 to 150 cm, and the thickness of each movable wall panel is the same.

[0012] Preferably, the movable wall panel is provided with oblique through holes, and with the horizontal direction as a reference, the height of the through holes on the side of the movable wall panel contacting the filling layer is higher than that on the other side.

[0013] Preferably, the partition is a stainless steel partition, and the thickness of the partition is 1 to 3 mm.

[0014] Preferably, the insulating layer is a carbon black insulating layer or a quartz sand insulating layer, and the thickness of the insulating layer is 50 to 100 cm.

[0015] Preferably, the thickness of the resistor material layer is 10 to 40 cm, the resistor material in the resistor material layer is non-graphitized calcined coke, and the particle size of the resistor material in the resistor material layer is 8 to 35 mm.

[0016] Preferably, the thickness of the thermal insulation layer is 20 to 80 cm, the thermal insulation particles in the thermal insulation layer are graphitized and calcined coke, and the particle size of the thermal insulation particles in the thermal insulation layer is ≤3 mm.

[0017] Preferably, an exhaust pipe is provided in the thermal insulation material layer on the side away from the partition, one end of the exhaust pipe is connected to the resistance material layer, and the other end is connected to the outside.

[0018] Preferably, the exhaust pipes contain a resistor material, the number of the exhaust pipes is 4 to 15, and the exhaust pipes are evenly distributed at equal distances.

[0019] Preferably, the diameter of each exhaust pipe is independently ≤30 mm, and the height is independently 50 to 120 mm.

[0020] It can be seen from the above technical solutions that compared with the prior art, the present invention has the following beneficial effects:

[0021] 1. The electric-driven roasting furnace disclosed in the utility model includes a furnace head, a furnace tail, several movable wall panels and fillers, which can realize electric roasting instead of gas roasting, and replace fuel with electricity, which can reduce the exhaust gas generated by combustion. When natural gas is burned, it mainly produces SO2 (1.5kg / 10,000m 3 ), NO2 (6.3kg / 10,000m 3 ) and smoke (2.4kg / 10,000m 3 ) three pollutants, the electric baking process can improve the environment while reducing the investment cost of waste treatment;

[0022] 2. Conventional gas roasting usually introduces excess air or oxygen to ensure sufficient combustion, resulting in an oxygen content in the furnace between the PPM level and 1%, which can easily cause carbon products to crack. However, the electric roasting process does not require oxygen combustion. Small-particle insulation material is laid in the furnace, and its oxygen content can be controlled below 50ppm, which reduces the risk of product cracking and thus improves the qualified rate of products.

[0023] 3. The electric-driven roasting furnace disclosed in the present invention directly heats the resistor material layer, which significantly reduces energy transmission loss and improves energy utilization efficiency compared to gas roasting, which heats the intermediate medium through gas combustion.

[0024] 4. A ring-type gas baking furnace is generally composed of 10 to 20 gas baking furnaces connected in series. If the furnace is fully loaded at one time, it needs at least 100 tons. If it is not fully loaded, energy is wasted and the cost is high. The electric-driven baking furnace disclosed in the present invention has the characteristics of a single independent furnace body. Each time the furnace is opened, it only needs dozens of tons of products depending on the size of the furnace body, which greatly improves its flexibility and significantly reduces the investment cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are merely embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0026] Figure 1 This is a top view of the electric-driven roasting furnace of the utility model;

[0027] Figure 2 This is a left side schematic diagram of the electric drive roasting furnace of the utility model;

[0028] Figure 3 This is a schematic diagram of the movable wall panel of the utility model;

[0029] Among them, 1. furnace head; 2. furnace tail; 3. movable wall panel; 4. filling material; 5. through hole; 6. exhaust pipe; 41. thermal insulation and heat conductive layer; 42. partition; 43. insulation layer; 411. graphite sagger layer; 412. resistance material layer; 413. thermal insulation material layer. DETAILED DESCRIPTION

[0030] The following is a clear and complete description of the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only a part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0031] As a preferred embodiment of the present invention, Figures 1-2 As shown, the utility model provides a graphite sagger electric-driven roasting furnace, which includes a furnace head 1, a furnace tail 2, several movable wall panels 3 and fillers 4;

[0032] The furnace head 1, the furnace tail 2 and a plurality of movable wall panels 3 form a furnace body, and the filling material 4 is filled in the furnace body;

[0033] The filler 4 includes a heat-insulating and heat-conducting layer 41, a partition 42 and an insulating layer 43 arranged vertically downward in sequence;

[0034] The heat-insulating and heat-conducting layer 41 includes a graphite sagger layer 411 , a resistance material layer 412 and a heat-insulating material layer 413 , which are sequentially coated from the inside to the outside. The heat-insulating material layer 413 is not provided at the furnace head end and the furnace tail end.

[0035] The number of the movable wall panels 3 is 2 to 8, the thickness of each movable wall panel 3 is independently 20 to 150 cm, and the thickness of each movable wall panel is the same.

[0036] like Figure 3 As shown, the movable wall panel 3 is provided with oblique through-holes 5. With the horizontal direction as a reference, the through-holes on the side of the movable wall panel 3 that contacts the filler 4 are higher than those on the other side. The angle between the through-holes 5 and the horizontal direction is preferably 45°. The use of movable wall panels 4 with oblique through-holes 5 at 45° in this utility model improves safety, significantly reduces production costs, and facilitates replacement of the wall panels.

[0037] The partition plate 42 is a stainless steel partition plate, and the thickness of the partition plate 42 is 1 to 3 mm.

[0038] The insulating layer 43 is a carbon black insulating layer or a quartz sand insulating layer, and the thickness of the insulating layer 43 is 50 to 100 cm.

[0039] The thickness of the resistor material layer 412 is 10-40 cm. The resistor material in the resistor material layer 412 is non-graphitized calcined coke. The particle size of the resistor material in the resistor material layer 412 is 8-35 mm.

[0040] The non-graphitized calcined coke is non-graphitized calcined coke obtained by treating petroleum coke at 800-1200°C.

[0041] The thickness of the thermal insulation layer 413 is 20 to 80 cm. The thermal insulation particles in the thermal insulation layer 413 are graphitized, calcined, and coke, and the particle size of the thermal insulation particles in the thermal insulation layer is ≤3 mm.

[0042] The graphitized calcined coke is graphitized calcined coke obtained by treating petroleum coke at a temperature above 2000°C.

[0043] An exhaust pipe 6 is provided in the insulation layer 413 on the side away from the partition 42. One end of the exhaust pipe 6 is connected to the resistance material layer 412, and the other end is connected to the outside. The exhaust pipe 6 contains resistance material. The number of exhaust pipes 6 ranges from 4 to 15, and the exhaust pipes 6 are evenly spaced.

[0044] The diameter of each exhaust pipe 6 is independently ≤30 mm, and the height is independently 50 to 120 mm.

[0045] The specific roasting steps are as follows:

[0046] 1. Two upper and lower movable wall panels 3 are inserted between the furnace head 1 and furnace tail 2. Four panels, two rows and two columns on each side, are installed in each electric-driven roasting furnace. A total of eight movable wall panels 3 are required. Compared to a fixed furnace body constructed of traditional refractory bricks, the cost of disassembling and repairing movable wall panels 3 is far lower. Damaged movable wall panels 3 can be recycled and remanufactured, further reducing costs. The perforated wall panels also increase the furnace's exhaust path and reduce the need for spraying. The 45-degree oblique perforations increase the flame's distance, reducing the range at which the flame escapes the movable wall panels 3, thus improving safety.

[0047] The dimensions of the movable wall panel 3 are as follows: length is half of the furnace body length, width is 100 cm, and height is half of the furnace body height. The movable wall panel 3 is cast in the form of cement concrete + steel bars.

[0048] Each panel of the movable wall panel 3 is evenly provided with through holes 5 at intervals of 5 cm, which are opened from the inside to the outside and are inclined downward at 45 degrees.

[0049] 2. Lay an insulating layer 43 on the bottom layer of the furnace body, followed by a layer of partitions 42, and finally a layer of thermal insulation material 413. Compared to traditional furnace loading techniques, this novel furnace loading technique incorporates a layer of partitions 42 between the insulating and thermal insulation layers. This prevents groundwater from seeping into the furnace and potentially affecting the material surface or causing cracking in the product. Furthermore, the partitions 42 can be readily seen during the overhead crane excavation process, preventing the excavated insulating layer 43 from mixing with the thermal insulation material. This reduces the cost of subsequent material separation and prolongs the time required to replenish the insulating layer 43 of the furnace body.

[0050] Furthermore, the insulating layer 43 is a quartz sand insulating layer, and the thickness of the insulating layer is 80 cm.

[0051] Furthermore, the partition 42 is a stainless steel partition, the size of which is consistent with the inner diameter of the furnace body and the thickness is 2 mm.

[0052] Furthermore, the thermal insulation material layer 413 is graphitized and calcined coke, the thermal insulation material particle size is ≤3mm, and the thermal insulation material thickness is 60cm.

[0053] 3. Place double-layer iron plates at a certain distance from the furnace body to shape it.

[0054] The use of the iron plate can perfectly isolate the thermal insulation material layer 413 from the resistance material layer 412, thereby avoiding the phenomenon that the resistance in the furnace body is uneven and the temperature in the furnace is uneven due to mixing of the two.

[0055] 4. Lay a certain thickness of resistance material between the iron plates and in the area surrounded by the iron plates.

[0056] Furthermore, the resistor material is non-graphitized calcined coke, with a particle size of 8 to 35 mm and a thickness of 10 cm (the thickness of the resistor material at the furnace head end and the furnace tail end is 40 cm, which is thicker than the other four sides).

[0057] 5. The green body is placed in the area enclosed by the iron plates, and resistor material is added to the gaps in the green body. A certain thickness of resistor material is laid on top of the green body to form a resistor material layer 412 that completely covers the green body. A certain number of exhaust pipes 6 are placed at equal distances. The bottom of the exhaust pipes 6 is connected to the resistor material layer 412, and the top is connected to the outside world. This ensures that the gases generated during the product baking process can pass through the resistor material layer 412 and be discharged from the furnace body for ignition, avoiding furnace explosion or explosion accidents caused by excessive gas production in the furnace that cannot be discharged.

[0058] Furthermore, the green body is a graphite sagger that has been isostatically pressed, with a length of 20 to 80 cm, a width of 20 to 60 cm, and a height of 60 to 150 cm. The saggers on the same layer are spaced 10 cm apart, and the layers are spaced 10 cm apart. Resistor material is laid in the interval to facilitate gas discharge, and resistor material with a thickness of 10 cm is laid on the top of the green body.

[0059] Furthermore, the exhaust pipe 6 is made of stainless steel, has a diameter of 30 mm and a height of 80 cm.

[0060] Furthermore, the number of the exhaust pipes 6 is 12, which are evenly placed in two rows at equal distances, and are filled with resistance material with a particle size of 10 to 20 mm.

[0061] Furthermore, the resistor material is a conductive resistor material.

[0062] Furthermore, the iron plate is removed after the filling is completed.

[0063] 6. Fill the sides and top of the furnace with insulation material of a certain thickness.

[0064] Furthermore, the insulation materials on both sides (not the furnace head / furnace tail end) and the furnace top are graphitized and calcined coke, the insulation material particle size is ≤3mm, and the insulation material thickness is 60cm.

[0065] 7. Supply power to increase temperature according to a fixed curve and monitor the temperature.

[0066] Furthermore, the heating curve is as follows: 0-300°C heating rate of 10°C / min, heat preservation for 360min, 300-700°C heating rate of 4°C / min, heat preservation for 720min, 700-1100°C heating rate of 8°C / min, heat preservation for 2160min.

[0067] After the program is completed, the temperature drops naturally and the graphite sagger is taken out of the furnace.

[0068] The above description is merely a preferred embodiment of the present invention and does not limit the technical scope of the present invention. Therefore, any minor modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A graphite sagger electric drive roasting furnace, characterized in that: The graphite sagger electric-driven roasting furnace comprises a furnace head, a furnace tail, several movable wall panels and fillers; The furnace head, furnace tail and several movable wall panels constitute the furnace body, and the filling material is filled in the furnace body; The filler comprises a heat-insulating and heat-conducting layer, a partition and an insulating layer arranged vertically downward in sequence; The heat-insulating and heat-conducting layer comprises a graphite sagger layer, a resistance material layer and a heat-insulating material layer which are sequentially covered from the inside to the outside; and no heat-insulating material layer is provided at the furnace head end and the furnace tail end.

2. The graphite sagger electric drive roasting furnace according to claim 1, characterized in that: The number of the movable wall panels is 2 to 8, the thickness of each movable wall panel is independently 20 to 150 cm, and the thickness of each movable wall panel is the same.

3. A graphite sagger electric drive roasting furnace according to claim 1 or 2, characterized in that: The movable wall panel is provided with oblique through holes. With the horizontal direction as a reference, the height of the through holes on one side of the movable wall panel contacting the filling layer is higher than that on the other side.

4. The graphite sagger electric-driven roasting furnace according to claim 3, characterized in that: The partition is a stainless steel partition with a thickness of 1 to 3 mm.

5. The graphite sagger electric-driven roasting furnace according to claim 4, characterized in that: The insulating layer is a carbon black insulating layer or a quartz sand insulating layer, and the thickness of the insulating layer is 50 to 100 cm.

6. The graphite sagger electric-driven roasting furnace according to claim 5, characterized in that: The thickness of the resistor material layer is 10-40 cm, the resistor material in the resistor material layer is non-graphitized calcined coke, and the particle size of the resistor material in the resistor material layer is 8-35 mm.

7. The graphite sagger electric-driven roasting furnace according to claim 6, characterized in that: The thickness of the thermal insulation material layer is 20 to 80 cm, the thermal insulation particles in the thermal insulation material layer are graphitized and calcined coke, and the particle size of the thermal insulation particles in the thermal insulation material layer is ≤3 mm.

8. The graphite sagger electric-driven roasting furnace according to any one of claims 4 to 7, characterized in that: An exhaust pipe is provided in the heat-insulating material layer on the side away from the partition, one end of the exhaust pipe is connected to the resistance material layer, and the other end is connected to the outside.

9. The graphite sagger electric-driven roasting furnace according to claim 8, characterized in that: The exhaust pipes contain resistance material, the number of the exhaust pipes is 4 to 15, and the exhaust pipes are evenly distributed at equal distances.

10. The graphite sagger electric-driven roasting furnace according to claim 9, characterized in that: The diameter of each exhaust pipe is independently ≤30mm, and the height is independently 50~120mm.

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