Flue gas waste heat recycling equipment for graphitization processing

Abstract

The utility model relates to the technical field of waste heat recycling equipment, in particular to flue gas waste heat recycling equipment for graphitization processing. Heat conduction air channels are arranged in the furnace body and comprise a plurality of transverse air channels, longitudinal air channels and vertical air channels, the transverse air channels and the longitudinal air channels are arranged at intervals in the length direction and the width direction of the furnace body and are communicated, the vertical air channels are arranged at intervals in the length direction of the longitudinal air channels, and the two ends of each vertical air channel are only communicated with the longitudinal air channels on the two sides; an air inlet pipe and an air outlet pipe which penetrate out of the furnace body are arranged on the two longitudinal air channels on the side respectively, the air inlet pipe is connected with an air tank, and the air outlet pipe is connected with a heat accumulating type heat exchanger. The heat conduction air channel is arranged in the furnace body, and smoke generated in the furnace can be directly pumped out to the heat storage type heat exchanger through the heat conduction air channel so that heat energy can be recycled. Through inert gas, heat exchange can be carried out between the inert gas and the resistance material in the furnace, so that the local heat energy is prevented from being too high; heat energy can be recovered during cooling; and low-temperature inert gas can also be injected to accelerate cooling.

Description

TECHNICAL FIELD

[0001] The utility model relates to a waste heat recovery equipment technical field especially uses a flue gas waste heat recovery and utilization equipment for graphitization processing. BACKGROUND

[0002] Graphitization is that non-graphitic carbon is treated by high temperature, and carbon material is heated to 2300-3000 DEG C by resistance heat, high temperature treatment provides energy for atomic rearrangement and structure transformation, and a large amount of energy is consumed in the process, with the increase of heat treatment temperature, the graphite interlayer spacing gradually becomes small, and the amorphous random layer structure of carbon is converted into the ordered graphite crystal structure. The furnace type used in the graphitization process of negative electrode material mainly includes Acheson graphitization furnace, inner string graphitization furnace, compartment type graphitization furnace and continuous graphitization furnace.

[0003] The process flow of Acheson graphitization furnace is: furnace cleaning (ensuring that there is no residual material in the furnace, checking whether the electrode and furnace body are intact), furnace loading (laying bottom material on the furnace bottom, uniformly laying resistance material on the bottom material, uniformly arranging crucibles containing carbon materials to be graphitized in the furnace, filling resistance material in the gap around the crucible, filling heat insulation lining, covering heat preservation material on the furnace top), power on (after the electrode is powered on, the resistance material generates high temperature due to resistance effect, usually about 2500 DEG C), high temperature maintaining (high temperature maintaining, ensuring that the carbon material is fully converted into graphite), furnace body cooling after power off, furnace unloading (cleaning the filling material one by one, and then taking out the graphitized product), and finally obtaining the required graphitized product. The graphitized product is crushed and screened to obtain the required particle size of the graphitized product.

[0004] In the graphitization process of Acheson graphitization furnace, high heat energy is generated, and in order to avoid high temperature oxidation of the electrode device, air cooling or water cooling equipment is arranged inside or outside the electrode for cooling, and then the heat energy in the heat absorbing medium is recovered, so as to achieve the purpose of heat recovery. However, the heat recovery utilization rate is low, and a large amount of heat is dissipated in the furnace, especially in the cooling stage.

[0005] Therefore, the utility model provides a flue gas waste heat recovery and utilization equipment for graphitization processing to improve the heat recovery rate in the furnace. UTILITY MODEL CONTENTS

[0006] The utility model aims at solving the problems in the prior art and provides a flue gas waste heat recovery and utilization equipment for graphitization processing.

[0007] In order to achieve the above purpose, the utility model adopts the following technical scheme:

[0008] The utility model provides a kind of flue gas waste heat recycling equipment for graphitization processing, including furnace body, and the both ends of furnace body are equipped with multiple columns of electrically conductive electrodes, and the heat conduction air duct is equipped in the furnace body, and the heat conduction air duct is made of non-temperature insulation high-temperature resistant material, and the heat conduction air duct includes multiple horizontal air ducts, vertical air ducts and vertical air ducts, and the horizontal air duct and the vertical air duct are respectively spaced along the length and width direction of furnace body and communicated, and the vertical air duct is spaced along the length direction of vertical air duct and only communicated with the vertical air duct of both sides at both ends of vertical air duct;Two vertical air ducts of side are equipped with gas inlet pipe and gas outlet pipe respectively, and gas inlet pipe is connected with gas tank, and gas outlet pipe is connected with regenerative heat exchanger, for heat recovery.

[0009] Preferably, the heat conduction air duct further includes an electrode air duct corresponding to each of the multiple columns of electrically conductive electrodes, the electrode air duct is communicated with the outermost vertical air duct, vertically spaced apertures corresponding to the electrically conductive electrodes are provided in the electrode air duct, and the electrically conductive electrodes pass through the apertures, the aperture diameter is larger than the outer diameter of the electrically conductive electrodes.

[0010] Preferably, the electrode air duct is divided into two chambers from the vertical centerline, the upper ends of the two chambers are communicated, and the gas outlets at the lower ends of the two chambers are communicated with the vertical air duct, and a partition wall is provided between the two gas outlets in the vertical air duct.

[0011] Preferably, the vertical air duct is not provided with a horizontal air duct at the position communicated with the gas outlet of the electrode air duct.

[0012] Preferably, the vertical air duct is not butt-jointed with the horizontal air duct at the position communicated with the gas outlet of the electrode air duct.

[0013] Preferably, the vertical air duct is in the shape of a wall.

[0014] Preferably, a bent air duct is provided in the vertical air duct, which is bent from the direction of the gas inlet pipe to the direction of the gas outlet pipe.

[0015] Preferably, a circulation pipe is provided between the gas inlet pipe and the gas outlet pipe, and valves are provided at both ends of the circulation pipe.

[0016] Preferably, the heat-resistant material is air-permeable refractory brick.

[0017] Preferably, the gas delivered by the gas tank is inert gas.

[0018] Compared with the prior art, the flue gas waste heat recycling equipment for graphitization processing provided by the utility model has the following beneficial effects:

[0019] 1. The heat conduction air duct is provided in the furnace body, and the flue gas generated in the furnace can be directly extracted to the regenerative heat exchanger through the heat conduction air duct for heat recovery and utilization.

[0020] 2、The heat-conducting air channel is built by air-permeable refractory bricks and the like, and has good air permeability, isolation, high-temperature resistance and strength.

[0021] 3、The heat-conducting air channel is provided in the utility model, and compared with the buried pipeline, the mode is more convenient to clean when the furnace is cleaned and has better durability.

[0022] Other advantages, objects and features of the utility model will be described in the subsequent specification to some extent; and to some extent, it will be obvious to those skilled in the art based on the study of the following text; or it can be taught from the practice of the utility model. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 It is a front view sectional schematic view of the Acheson graphitization furnace after filling of the utility model.

[0024] Figure 2 It is a front view sectional schematic view of the Acheson graphitization furnace after filling of the utility model. Figure 1 It is a top view schematic view after the furnace top heat preservation material is taken out.

[0025] Figure 3 It is a gas flow direction schematic view after inert gas is injected of the utility model.

[0026] Figure 4 It is a front view sectional schematic view of the Acheson graphitization furnace after filling of the utility model. Figure 3 It is a B-B sectional schematic view of the utility model.

[0027] Figure 5 It is a C-C sectional schematic view of the utility model. Figure 3 It is a D-D sectional schematic view of the utility model.

[0028] Figure 6 It is an E-E sectional schematic view of the utility model. Figure 3 It is a F-F sectional schematic view of the utility model.

[0029] Figure 7 It is a G-G sectional schematic view of the utility model. Figure 3 It is an A-A sectional schematic view of the utility model.

[0030] Figure 8 It is an A-A sectional schematic view of the utility model. Figure 3 It is a G-G sectional schematic view of the utility model.

[0031] Figure 9 It is a G-G sectional schematic view of the utility model. Figure 3 It is a G-G sectional schematic view of the utility model.

[0032] Figure 10 It is an A-A sectional schematic view of the utility model. Figure 1 It is an A-A sectional schematic view of the utility model.

[0033] Figure 11The utility model discloses a longitudinal air channel and vertical air channel two air port intercommunication part local section view of the utility model's corresponding air inlet pipe.

[0034] Figure 12 The utility model discloses an acheson graphitization furnace's three -dimensional schematic diagram of not filling material.

[0035] Figure 13 The utility model discloses a heat recovery system's three -dimensional schematic Figure 1 .

[0036] Figure 14 The utility model discloses a heat recovery system's three -dimensional schematic Figure 2 .

[0037] In the drawing: 1, furnace body;2, bottom material;3, conducting electrode;4, resistance material;5, heat preservation material;6, crucible;7, horizontal air channel;8, longitudinal air channel;9, vertical air channel;10, bend air channel;11, sleeve hole;12, partition;13, air inlet pipe;14, air outlet pipe;15, circulating pipe;16, air port;17, chamber;18, electrode air channel. DETAILED DESCRIPTION

[0038] The utility model discloses an acheson graphitization furnace's three -dimensional schematic diagram of not filling material. Figures 1-14 , the technical scheme in the utility model embodiment is clearly and completely described, and obviously, the described embodiment only is a part of the embodiment of the utility model, not all the embodiment.

[0039] Embodiment 1, in order to improve the heat energy recovery rate of acheson graphitization furnace, reduce heat loss waste, the embodiment provides a kind of flue gas waste heat recovery and utilization equipment for graphitization, including furnace body 1, furnace body 1 uses refractory brick as main building material, and pours with silicon carbide castable, improves thermal conductivity and chemical corrosion resistance.It is also provided with furnace shell outside furnace body 1, as external support structure;Furnace shell is usually welded by thick steel plate, with high strength;Its inner side is paved with refractory fibre felt, for heat insulation and protection furnace shell.Furnace body 1 both ends are provided with multiple rows of conducting electrodes 3, and conducting electrode 3 mostly uses graphite electrode, with good conductivity and high temperature resistance;And conducting electrode 3 is built around refractory protection layer.Furnace body 1 is laid with bottom material 2 in bottom, and lower bottom material 2 usually uses high-alumina brick or magnesite, as refractory layer, with high strength and high temperature resistance;Upper bottom material 2 usually uses graphite transfer, as conducting layer, with good conductivity and high temperature resistance.Furnace body 1 is filled with resistance material 4 between several crucibles 6 above bottom material 2;Crucible 6 is as the container of carbon material to be graphitized, and is uniformly distributed on bottom material 2;Resistance material 4 usually uses petroleum coke or pitch coke, and is uniformly filled around crucible 6, to ensure that heat is uniformly transferred.Furnace body 1 inner wall circle and furnace top are filled with lining material for heat insulation, and lining material usually selects quartz sand or refractory fibre, which can effectively reduce heat loss, maintain high temperature inside furnace, and avoid external temperature rise.

[0040] By laying the above-mentioned filler, the furnace body 1 has good electrical conductivity and high temperature resistance to meet the requirements of high-temperature graphitization production.

[0041] To make efficient use of the high-temperature heat energy inside the furnace, a heat-conducting air duct is also provided inside the furnace body 1. This heat-conducting air duct is constructed of high-temperature resistant material without insulation. The heat-conducting air duct includes multiple horizontal air ducts 7, multiple vertical air ducts 8, and multiple vertical channels 9. (See attached diagram.) Figure 3 As shown, multiple horizontal air channels 7 are arranged laterally at intervals along the width (longitudinal) direction of the furnace body 1 within the furnace body 1; multiple vertical air channels 8 are arranged longitudinally at intervals along the length (lateral) direction of the furnace body 1 within the furnace body 1; and multiple vertical air channels 9 are arranged at intervals along the length direction of the vertical air channels 8 within the furnace body 1. (See attached diagram.) Figure 1 As shown, both the transverse air passage 7 and the longitudinal air passage 8 are buried in the bottom material 2 during use and do not sink in the lower bottom material 2; refer to the attached... Figure 8 As shown, the vertical air channel 9 is wall-shaped, extending from the bottom material 2 and into the resistive material 4, and is completely buried by the resistive material 4.

[0042] See attached document Figure 3 As shown, the horizontal air passage 7 and the vertical air passage 8 are arranged in a crisscross pattern, and the intersecting parts are all connected.

[0043] See attached document Figure 9 As shown, the vertical air duct 9 has air inlets 16 at both ends along its length, and these air inlets 16 at both ends of the vertical air duct 9 are connected to the two longitudinal air ducts 8 on the transverse sides. The vertical air duct 9 and the transverse air duct 7 are staggered and not directly connected. The remaining longitudinal air ducts 8 between the two transverse sides of the vertical air duct 9 are not connected to the vertical air duct 9 at their contact points, which are all masonry base surfaces. The bottom and top walls of the vertical air duct 9 are staggered with baffles, forming a bend in the air duct 10 within the vertical air duct 9, extending from the direction of the inlet pipe 13 to the direction of the outlet pipe 14. This prevents the gas injected into the vertical air duct 9 from being directly discharged from the inlet to the outlet, which would result in poor gas flow in the upper part of the vertical air duct 9 and consequently poor heat absorption in the upper part of the vertical air duct 9.

[0044] Two longitudinal air channels 8 are respectively connected with an air inlet pipe 13 and an air outlet pipe 14 at the side of the two ends of the furnace body 1, the air inlet pipe 13 and the air outlet pipe 14 are both penetrated from the side wall of the furnace body 1, and the penetration part is built with a partition layer made of refractory bricks; the pipe wall of the air inlet pipe 13 and the air outlet pipe 14 is wrapped with a heat insulation layer. The air inlet pipe 13 is connected with a gas tank through a pump, and the gas tank provides heat exchange gas. The air outlet pipe 14 is connected with a heat accumulating heat exchanger through a pump, and the heat accumulating heat exchanger can be a ceramic honeycomb heat accumulating heat exchanger, which can perform heat exchange of a heat source above 2000℃. When the heat accumulating body is in contact with a hot fluid, heat is received from the hot fluid, the temperature of the heat accumulating body is raised, then the heat accumulating body is in contact with a cold fluid, heat is transferred to the cold fluid, and the temperature of the heat accumulating body is lowered, so that the purpose of heat exchange is achieved. The structure is simple, can resist high temperature, and is bulky, so mixing of the two fluids cannot be completely avoided. It is suitable for recovery or cooling of high-temperature gas heat. Preferably, a purifier is also provided, and the flue gas after heat exchange enters the purifier for purification treatment, so as to avoid environmental pollution.

[0045] Valves are arranged between the air inlet pipe 13, the air outlet pipe 14 and the corresponding pumps, for separately controlling the opening and closing of the pipes.

[0046] The heat-resistant material is air-permeable refractory brick, which has a high porosity (usually 20%-30%) to allow gas to pass through but block solid particles. Alternatively, the heat-resistant material is made of refractory bricks, but the heat-conducting air channel is provided with a plurality of air-permeable holes isolated by dense metal mesh, which meet the gas medium flow condition through the air-permeable holes, and the dense metal mesh can also block solid particles. Compared with heat exchange pipes and the like arranged in the furnace, the heat-conducting air channel built by refractory bricks not only has high strength and can provide stable support, but also has good high-temperature resistance and will not be heat-insulated to meet the heat exchange basis.

[0047] The gas delivered by the gas tank is inert gas, such as nitrogen and helium, so as to prevent the injected air from mixing with the chemical gas generated in the furnace and burning or even exploding at high temperature.

[0048] According to the above technical scheme, there are three use schemes in use:

[0049] The first kind: in the graphitization high-temperature process of the Acheson graphitization furnace, volatile components such as moisture and light hydrocarbons contained in the filler (such as petroleum coke and pitch coke) will gradually volatilize in the heating process; at the same time, the organic matter in the filler may also undergo thermal cracking to generate small molecule gas; impurities such as sulfur, nitrogen and oxygen in the filler may react with carbon or other elements at high temperature to generate gas such as sulfur dioxide and carbon monoxide; at high temperature, carbon elements may also react with residual air and water vapor in the furnace to generate gases such as nitric oxide and hydrogen.

[0050] In summary, during the high-temperature graphitization process of the Acheson graphitization furnace, the filling material can produce hydrocarbons, sulfur-containing, nitrogen-containing, carbon oxide and other gases. These gases can not only cause the pressure in the furnace to rise, but the production of gas can also cause the loss of carbon materials in the filling material, affecting the quality of the graphitized product; most importantly, part of the flying gas may burn or even explode at high temperature, which poses a safety hazard.

[0051] Therefore, the first use case is to constitute a smoke exhaust system: at this time, the pump of the gas outlet pipe 14 is started, thereby forming a negative pressure in the heat-conducting gas channel, and the gas produced in the furnace gradually penetrates the wall built of refractory bricks, thereby flowing along the heat-conducting gas channel and finally being exhausted from the gas outlet pipe 14 to the regenerative heat exchanger for heat exchange treatment. This is simply to collect the exhaust gas and flue gas produced in the furnace, that is, to avoid the accumulation of dangerous gas in the furnace body 1 and reduce the safety hazard; and the heat energy exchange between the flue gas and the heat exchanger can also be utilized to reasonably utilize the heat inside the furnace body 1.

[0052] The second is to avoid local temperature being too high, at this time, the pumps of the gas inlet pipe 13 and the gas outlet pipe 14 are started.

[0053] The pump of the gas inlet pipe 13 is started to inject inert gas into the furnace body 1, and the inert gas flows along the heat-conducting flue gas and also penetrates into the furnace. The inert gas with a lower temperature than the temperature inside the furnace body 1 exchanges heat with the inside of the furnace body 1 to carry away part of the heat energy. The inert gas filled in can cause the pressure in the furnace body 1 to rise, so the pump of the gas outlet pipe 14 is started to extract the gas mixture in the furnace body 1 and the heat-conducting gas channel, that is, to balance the air pressure, and also to extract the flue gas for heat energy exchange and utilization. Not filling air is to avoid the mixture of flue gas and air in the furnace burning and exploding at high temperature. The vertical gas channel 8 and the horizontal gas channel 7 are used to absorb the heat energy inside the furnace body 1, and the vertical gas channel 9 is used to absorb the heat energy between the resistive material 4 in the furnace body 1, so as to have a wide heat absorption surface and uniform heat absorption to avoid heat imbalance caused by local heat exchange.

[0054] The third is used in the cooling stage.

[0055] During cooling, the pumps of the gas inlet pipe 13 and the gas outlet pipe 14 are started, and the inert gas injected into the gas inlet pipe 13 is used for cooling, but the flue gas still has a high temperature and can still be used for heat exchange.

[0056] Preferably, the valves of the gas inlet pipe 13 are all three-way valves, two interfaces of the three-way valves are still connected with the gas inlet pipe 13 and the pump, and the other interface is connected with a shunt pipe. The shunt pipe is connected with a cold chamber, and the cold chamber still stores inert gas. When the shunt pipe is connected with the gas inlet pipe 13, the low-temperature inert gas is injected into the inside of the furnace body 1, which can accelerate the cooling.

[0057] In a further embodiment of this solution, the heat-conducting air duct further includes electrode air ducts 18 corresponding to a row of conductive electrodes 3. The electrode air ducts 18 are made of the same material as the heat-conducting air ducts, and are constructed of breathable refractory bricks.

[0058] The electrode air passage 18 is provided with a plurality of vertically spaced sleeve holes 11, each sleeve hole 11 corresponding to a conductive electrode 3. The conductive electrode 3 passes through the sleeve hole 11. The diameter of the sleeve hole 11 is larger than the diameter of the conductive electrode 3, so as not to affect the contact between the resistive material 4 and the conductive electrode 3, that is, not to interfere with the release of electricity and the conduction of electricity by the conductive electrode 3. The internal space of the electrode gas passage 18 is divided into two chambers 17 along the vertical centerline. These two chambers 17 are connected at their upper ends, and each chamber 17 has an air inlet 16 at its lower end. Both air inlets 16 communicate with the longitudinal gas passage 8 on the side. A partition wall 12 is installed between the two air inlets 16 within the longitudinal gas passage 8, thus sealing the lower ends of the two chambers 17 of the electrode gas passage 18. Gas can only enter one chamber 17 of the electrode gas passage 18 from one side air inlet 16 within the longitudinal gas passage 8, then rises from that chamber 17, flows from the top into the other chamber 17, and then sinks to merge back into the longitudinal gas passage 8 through the other air inlet 16. This creates a gas flow guide within the electrode gas passage 18, preventing the rising and sinking of flue gas from conflicting and affecting gas flow. This design is intended to absorb heat energy near the conductive electrode 3, preventing high-temperature oxidation of the conductive electrode 3.

[0059] In this embodiment, no transverse airway 7 is provided at the part where the longitudinal airway 8 communicates with the air port 16 of the electrode airway 18, so as to prevent the injected inert gas from being diverted at this point and to ensure that the inert gas enters the electrode airway 18 for heat absorption.

[0060] In this embodiment, the portion of the longitudinal airway 8 that communicates with the air inlet 16 of the electrode airway 18 does not connect with the transverse airway 7. (See attached diagram.) Figure 3 As shown, the length of the transverse air passage 7 is shortened here, and it is only connected to the remaining longitudinal air passages 8 between the two side longitudinal air passages 8. This can also prevent the inert gas from being diverted at the part where the electrode air passage 18 is connected to the longitudinal air passage 8.

[0061] In a further embodiment of this solution, as described in Example 3, the inlet pipe 13 and outlet pipe 14 are connected to a circulation pipe 15, which is also connected to the corresponding valves. Valves are installed at both ends of the circulation pipe 15, and a pump is also installed on the circulation pipe 15. The purpose of the circulation pipe 15 is to close the valves of the inlet pipe 13 and outlet pipe 14. At this time, the inlet pipe 13, the heat-conducting air passage, the outlet pipe 14, and the circulation pipe 15 form a loop. When the pump in the circulation pipe 15 starts, the flue gas in the furnace circulates within the loop. The flow of the flue gas drives the flow of heat energy in the furnace, ensuring that the heat energy is evenly distributed within the furnace.

[0062] The above merely describes a preferred embodiment of the present application, but the protection scope of the present application is not limited thereto, and any person skilled in the art can make equivalent replacements or changes to the technical scheme and the inventive concept of the present application within the technical scope disclosed by the present application, and all of them should be covered within the protection scope of the present application.

[0063] In the description of the present application, the description of the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present application, the illustrative description of the above terms is not necessarily directed to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, the person skilled in the art can combine and combine the different embodiments or examples described in the present application and the features of the different embodiments or examples without contradiction.

[0064] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limiting the present application, and the person skilled in the art can make changes, modifications, replacements and modifications to the above embodiments within the scope of the present application.

Claims

1. A flue gas waste heat recovery and utilization equipment for graphitization processing, comprising a furnace body (1), a plurality of rows of conductive electrodes (3) are arranged at both ends of the furnace body (1), characterized in that, The furnace body (1) is internally provided with a heat-conducting air channel made of non-temperature-insulating high-temperature-resistant material, which comprises multiple horizontal air channels (7), vertical air channels (8) and vertical air channels (9). The horizontal air channels (7) and the vertical air channels (8) are respectively arranged along the length and width directions of the furnace body (1) and are in communication with each other. The vertical air channels (9) are arranged along the length direction of the vertical air channels (8) and are in communication with the vertical air channels (8) at both ends.

2. The flue gas waste heat recovery device for graphitization processing according to claim 1, characterized in that, The heat-conducting air channel further comprises an electrode air channel (18) corresponding to each of the multiple rows of conductive electrodes (3). The electrode air channel (18) is in communication with the outermost vertical air channel (8). The electrode air channel (18) is vertically and spacedly provided with a sleeve hole (11) corresponding to each of the conductive electrodes (3). The conductive electrode (3) passes through the sleeve hole (11). The diameter of the sleeve hole (11) is larger than the outer diameter of the conductive electrode (3).

3. The flue gas waste heat recovery device for graphitization processing according to claim 2, characterized in that, The electrode air channel (18) is divided into two chambers (17) by a vertical center line. The upper ends of the two chambers (17) are in communication. The lower ends of the two chambers (17) are provided with air outlets (16) in communication with the vertical air channel (8). A partition wall (12) is arranged between the two air outlets (16) in the vertical air channel (8).

4. The flue gas waste heat recovery device for graphitization processing according to claim 3, characterized in that, The vertical air channel (8) is not provided with a horizontal air channel (7) at the position in communication with the air outlet (16) of the electrode air channel (18).

5. The flue gas waste heat recovery device for graphitization processing according to claim 3, characterized in that, The position in communication with the air outlet (16) of the electrode air channel (18) is not butt-jointed with the horizontal air channel (7).

6. The flue gas waste heat recovery device for graphitization processing according to claim 1, characterized in that, The vertical air channel (9) is in the shape of a wall.

7. The flue gas waste heat recovery device for graphitization processing according to claim 6, characterized in that, The vertical air channel (9) is internally provided with a bent air channel (10) bent from the direction of the air inlet pipe (13) to the direction of the air outlet pipe (14).

8. The flue gas waste heat recovery device for graphitization processing according to claim 1, characterized in that, A circulation pipe (15) is arranged between the air inlet pipe (13) and the air outlet pipe (14). The circulation pipe (15) is provided with valves at both ends.

9. The flue gas waste heat recovery device for graphitization processing according to claim 1, characterized in that, The heat-conducting air channel is built by air-permeable refractory bricks.

10. The flue gas waste heat recovery device for graphitization processing according to claim 1, characterized in that, The gas delivered by the gas tank is inert gas.

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