Graphitization furnace

Abstract

The utility model relates to a graphitization furnace, which comprises: a furnace body having a reaction chamber; the tail gas treatment device is communicated with the reaction bin through a tail gas pipe and is used for extracting flue gas in the reaction bin; the liquid sealing device comprises an access pipe, a liquid sealing tank and an exhaust pipe, liquid is stored in the liquid sealing tank, one end of the access pipe is communicated with the tail gas pipe, the other end of the access pipe is communicated with the liquid sealing tank and extends below the liquid level of the liquid sealing tank, and the exhaust pipe is communicated with the liquid sealing tank and is located above the liquid level of the liquid sealing tank; wherein the reaction bin can guide at least part of flue gas into the access pipe through the tail gas pipe in a positive pressure state. According to the graphitization furnace, the probability that a large number of volatile components are gathered in the reaction bin to affect normal operation of the graphitization furnace can be effectively reduced, and the electrical reliability and the operation stability of the graphitization furnace are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of graphite material production, in particular to a graphitization furnace. BACKGROUND

[0002] The graphitization furnace is a high-temperature processing device for carbon materials, mainly used for sintering and graphitization of carbon materials.

[0003] In the related art, during a long-time operation of the graphitization furnace, abnormal working conditions (such as coking in the furnace) are prone to occur, which causes a large amount of volatile components (such as methane, hydrogen and hydrogen sulfide) to accumulate in the furnace. If the large amount of volatile components cannot be discharged in time, a positive pressure state will be formed in the furnace, causing other substances in the furnace to be ejected outside the furnace body, resulting in operation failure of the graphitization furnace and affecting the electrical reliability and operation stability of the graphitization furnace. CONTENT OF THE UTILITY MODEL

[0004] The present application aims to solve the problem that the volatile components accumulate in the furnace under abnormal working conditions of the graphitization furnace, which affects the electrical reliability and operation stability of the graphitization furnace. To this end, the present application provides a graphitization furnace.

[0005] The present application provides a graphitization furnace, comprising:

[0006] A furnace body having a reaction chamber;

[0007] An exhaust gas treatment device connected to the reaction chamber through an exhaust pipe for extracting flue gas in the reaction chamber;

[0008] A liquid seal device comprising a connecting pipe, a liquid seal tank and an exhaust pipe, the liquid seal tank storing a liquid, one end of the connecting pipe being connected to the exhaust pipe and the other end being connected to the liquid seal tank and extending below the liquid level of the liquid seal tank, the exhaust pipe being connected to the liquid seal tank and being located above the liquid level of the liquid seal tank;

[0009] Wherein, the reaction chamber can guide at least part of the flue gas to the connecting pipe through the exhaust pipe under a positive pressure state.

[0010] The graphitization furnace according to the present application has at least the following beneficial effects:

[0011] The graphitization furnace of the present application is provided with a furnace body, a tail gas treatment device and a liquid sealing device. The liquid in the liquid sealing tank performs liquid sealing on the access pipe during normal operation of the graphitization furnace, so that the tail gas treatment device can smoothly extract the high-temperature flue gas generated in the reaction chamber through the tail gas pipe and recover heat from the high-temperature flue gas. When abnormal conditions occur in the graphitization furnace, the access pipe introduces a large amount of volatile components generated in the reaction chamber into the liquid sealing tank along with the high-temperature flue gas, the liquid in the liquid sealing tank depressurizes the flue gas stream carrying a large amount of volatile components, and the depressurized flue gas stream is discharged through the exhaust pipe, thereby reducing the probability that a large amount of volatile components will accumulate in the reaction chamber and affect the normal operation of the graphitization furnace, and improving the electrical reliability and stability of the graphitization furnace.

[0012] In some embodiments, the ratio of the liquid level depth of the liquid sealing tank to the length of the access pipe extending into the liquid in the liquid sealing tank is 100-700.

[0013] In this way, when the access pipe introduces a flue gas stream carrying a large amount of volatile components into the liquid in the liquid sealing tank during abnormal conditions of the graphitization furnace, the flue gas stream can be dispersed by a large liquid resistance, thereby reducing the probability that a large amount of volatile components will accumulate in the reaction chamber and affect the normal operation of the graphitization furnace, and also reducing the erosion damage of the flue gas stream to the liquid sealing tank.

[0014] In some embodiments, the liquid sealing device further comprises a liquid supplementing mechanism in communication with the liquid sealing tank for supplementing liquid into the liquid sealing tank.

[0015] In this way, the liquid supplementing mechanism supplements liquid into the liquid sealing tank in a timely manner, thereby overcoming the problem that the liquid in the liquid sealing tank is difficult to meet the use requirements due to evaporation and consumption, and enabling the liquid in the liquid sealing tank to maintain a better liquid sealing effect and pressure relief effect on the flue gas stream.

[0016] In some embodiments, the liquid sealing device further comprises a liquid level detection mechanism provided in the liquid sealing tank, and the liquid level detection mechanism is used to detect the liquid level of the liquid sealing tank.

[0017] In this way, the liquid level detection mechanism can timely detect the lack of liquid in the liquid sealing tank, so that the liquid supplementing mechanism can supplement liquid into the liquid sealing tank in a timely manner, thereby enabling the liquid in the liquid sealing tank to maintain a better liquid sealing effect and pressure relief effect on the flue gas stream, and enhancing the overall linkage of the liquid sealing device.

[0018] In some embodiments, the liquid sealing device further comprises a waste discharge mechanism in communication with the bottom of the liquid sealing tank for discharging the deposits and / or liquid in the liquid sealing tank.

[0019] Therefore, the impurities deposited on the bottom of the liquid seal tank can be discharged with the liquid in time through the waste discharge mechanism, and the problem that the impurities are accumulated on the bottom of the liquid seal tank and affect the normal use of the liquid seal tank is effectively solved.

[0020] In some embodiments, the graphitization furnace further comprises an explosion-proof member arranged on the pipe wall of the access pipe.

[0021] Therefore, the explosion-proof member can relieve the pressure in the access pipe when the pressure is too high, reduce the probability of explosion of the access pipe due to excessive pressure, and further improve the stability and reliability of the operation of the graphitization furnace.

[0022] In some embodiments, the inner wall of the access pipe is sequentially provided with a first heat preservation layer and a first temperature-resistant layer in a radial direction inwardly, and the first heat preservation layer and the first temperature-resistant layer are stacked.

[0023] Therefore, the first temperature-resistant layer and the first heat preservation layer can double-protect the access pipe by taking advantage of the good temperature resistance and wear resistance of the first temperature-resistant layer and the good heat preservation performance of the first heat preservation layer, thereby reducing the heating temperature of the access pipe, further reducing the probability of structural damage of the access pipe due to excessive heating temperature, improving the structural stability and service life of the access pipe, and thus improving the overall operation stability and reliability of the graphitization furnace.

[0024] In some embodiments, the ratio of the thickness of the first heat preservation layer to the thickness of the first temperature-resistant layer is 5-26, and the ratio of the thickness of the pipe wall of the access pipe to the thickness of the first temperature-resistant layer is 1-3.2.

[0025] Therefore, the thickness of the first heat preservation layer is much greater than the thickness of the first temperature-resistant layer, so that the stacked first heat preservation layer and first temperature-resistant layer have good temperature resistance and heat preservation performance, and at the same time, the difficulty of heat conduction of high-temperature flue gas to the pipe wall of the access pipe is increased, thereby reducing the probability of damage of the access pipe due to overheating.

[0026] At the same time, the thickness of the pipe wall of the access pipe is at least greater than the thickness of the first temperature-resistant layer and less than the thickness of the first heat preservation layer, so that the access pipe has a good supporting effect on the first temperature-resistant layer and the first heat preservation layer, and at the same time, the material cost of the access pipe is reduced.

[0027] In some embodiments, the thickness of the pipe wall of the access pipe is 2mm-50mm; and / or, the thermal conductivity of the access pipe is 30W / (m·k)-100W / (m·k).

[0028] Therefore, the access pipe can have good structural strength, and at the same time, the thermal conductivity of the access pipe can remain stable, so as to better support and fix the first temperature-resistant layer and the first heat preservation layer.

[0029] In some embodiments, the inner wall of the tail gas pipe is sequentially provided with a second heat preservation layer, a lightweight layer and a second temperature-resistant layer in a radial direction from inside to outside, and the second heat preservation layer, the lightweight layer and the second temperature-resistant layer are sequentially stacked.

[0030] In this way, by virtue of the good temperature resistance and wear resistance of the second temperature-resistant layer, the intermediate support performance of the lightweight layer and the good heat preservation performance of the second heat preservation layer, the direct heating temperature of the tail gas pipe can be reduced, thereby reducing the probability of structural damage of the tail gas pipe due to excessively high heating temperature, and the heat of the high-temperature flue gas can be locked by the second temperature-resistant layer, the lightweight layer and the second heat preservation layer, so as to reduce the conduction and dissipation of the high-temperature flue gas by the pipe wall of the tail gas pipe, thereby improving the heat recovery efficiency of the tail gas treatment device.

[0031] In some embodiments, the ratio of the thickness of the lightweight layer to the thickness of the second temperature-resistant layer is 5-20, the ratio of the thickness of the second heat preservation layer to the thickness of the second temperature-resistant layer is 7-30, and the ratio of the thickness of the pipe wall of the tail gas pipe to the thickness of the second temperature-resistant layer is 1-2.5.

[0032] In this way, the thickness of the lightweight layer is much greater than the thickness of the second temperature-resistant layer, the lightweight layer plays a good supporting role on the second temperature-resistant layer, the second temperature-resistant layer can better play its temperature resistance, and the material cost of the second temperature-resistant layer is reduced; the thickness of the second heat preservation layer is much greater than the thickness of the second temperature-resistant layer, the heat preservation effect of the second heat preservation layer on the high-temperature flue gas is improved, and the difficulty of heat conduction of the high-temperature flue gas to the pipe wall of the tail gas pipe is increased, thereby reducing the probability of damage of the tail gas pipe due to overheating; the thickness of the pipe wall of the tail gas pipe is greater than the thickness of the second temperature-resistant layer and much smaller than the thicknesses of the lightweight layer and the second heat preservation layer, the heat dissipation of the tail gas pipe to the high-temperature flue gas is reduced, and the heat preservation effect of the lightweight layer and the second heat preservation layer on the high-temperature flue gas is improved accordingly, thereby further improving the heat recovery efficiency of the tail gas treatment device.

[0033] In some embodiments, the thermal conductivity of the second temperature-resistant layer is 5W / (m·k)-20W / (m·k).

[0034] In this way, the thermal conductivity of the second temperature-resistant layer is controlled to be low, and the temperature resistance and heat preservation effect of the second temperature-resistant layer on the high-temperature flue gas are improved.

[0035] In some embodiments, the thermal conductivity of the lightweight layer is 0.3W / (m·k)-2W / (m·k).

[0036] In this way, the thermal conductivity of the lightweight layer is controlled to be low, and the temperature resistance and heat preservation effect of the lightweight layer on the high-temperature flue gas are improved.

[0037] In some embodiments, the thermal conductivity of the second heat preservation layer is 0.05W / (m·k)-2W / (m·k).

[0038] In this way, the thermal conductivity of the second heat preservation layer is controlled to be low, and the temperature resistance and heat preservation effect of the second heat preservation layer on the high-temperature flue gas are improved.

[0039] In some embodiments, the tail gas pipe has a wall thickness of 6 pm to 50 mm; and / or the tail gas pipe has a thermal conductivity of 300 W / (m·k) to 600 W / (m·k).

[0040] In this way, the tail gas pipe has good structural strength, and the thermal conductivity of the access pipe can remain stable, so as to better support and fix the second temperature-resistant layer, the lightweight layer, and the second heat preservation layer.

[0041] At the same time, the thermal conductivity of the second temperature-resistant layer, the lightweight layer, and the second heat preservation layer is worse than that of the tail gas pipe, and the three layers can better preserve the high-temperature flue gas, thereby further improving the heat recovery efficiency of the tail gas treatment device.

[0042] In some embodiments, the tail gas pipe is provided with a first temperature detection member at the inlet and a second temperature detection member at the outlet.

[0043] In this way, the inlet temperature of the tail gas pipe is detected by the first temperature detection member, and the outlet temperature of the tail gas pipe is detected by the second temperature detection member, so as to monitor the actual temperature inside the tail gas pipe. If the actual temperature inside the tail gas pipe is too high, the tail gas treatment device reduces the suction rate of the high-temperature flue gas, thereby reducing the probability of overheating damage to the functional components of the tail gas treatment device caused by excessive concentration of the high-temperature flue gas, and improving the operation stability and reliability of the tail gas treatment device.

[0044] The above description is only a summary of the technical solutions of the present application. In order to more clearly understand the technical means of the present application, the specific embodiments of the present application can be implemented in accordance with the content of the specification, and in order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the following specific embodiments of the present application are described. BRIEF DESCRIPTION OF DRAWINGS

[0045] Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The accompanying drawings are included to provide a better understanding of the preferred embodiments, and are not considered limiting of the present application. Moreover, like reference numerals denote same or similar components throughout the several views of the drawings. In the drawings:

[0046] Figure 1 FIG. 1 is a structural schematic diagram of a graphitization furnace according to an embodiment of the present application.

[0047] Figure 2 FIG. 2 is a structural schematic diagram of a liquid seal device according to an embodiment of the present application.

[0048] Figure 3 A structure top view of the liquid seal device of the embodiment of the present application.

[0049] Figure 4 A structure schematic view of the access pipe of the embodiment of the present application along the axial direction.

[0050] Figure 5 A structure schematic view of the access pipe of the embodiment of the present application along the radial direction.

[0051] Figure 6 A structure schematic view of the tail gas pipe of the embodiment of the present application along the axial direction.

[0052] Figure 7 A structure schematic view of the tail gas pipe of the embodiment of the present application along the radial direction.

[0053] Legend of reference signs: furnace body 10; reaction chamber 11; tail gas treatment device 20; tail gas pipe 21; second heat preservation layer 211; light layer 212; second temperature resistant layer 213; first temperature detection element 22; second temperature detection element 23; liquid seal device 30; access pipe 31; first heat preservation layer 311; first temperature resistant layer 312; liquid seal tank 32; exhaust pipe 33; liquid supplementing mechanism 34; liquid level detection mechanism 35; first liquid level detection element 351; second liquid level detection element 352; waste discharge mechanism 36; explosion-proof element 40. DETAILED DESCRIPTION

[0054] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0055] In the description of the present application, it should be understood that if there are terms such as “center”, “longitudinal”, “transverse”, “length”, “width”, “thickness”, “upper”, “lower”, “front”, “rear”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inner”, “outer”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., these terms indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0056] In addition, if there are these terms "first", "second", these terms are only used for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first", "second" can be explicitly or implicitly included at least one of the features. In the description of the present application, if there are the terms "a plurality of", the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise explicitly specified and limited.

[0057] In the present application, unless otherwise explicitly specified and limited, if there are the terms "mounting", "connecting", "connecting", "fixing" and the like, these terms should be understood in a broad sense. For example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0058] In the present application, unless otherwise explicitly specified and limited, if there are similar descriptions such as "first feature on" or "below" the second feature, the meaning can be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature "above", "above" and "above" the second feature can be the first feature directly above or obliquely above the second feature, or only indicates that the first feature is higher than the second feature in horizontal height. The first feature "below", "below" and "below" the second feature can be the first feature directly below or obliquely below the second feature, or only indicates that the first feature is lower than the second feature in horizontal height.

[0059] It should be noted that if an element is referred to as "fixed to" or "provided to" another element, it can be directly on another element or there can be a middle element. If an element is considered to be "connected" to another element, it can be directly connected to another element or there can be a middle element. If present, the terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used in the present application are only for the purpose of illustration, and do not represent the only implementation.

[0060] The carbon atoms of the carbonaceous material are irregularly arranged, and only by high-temperature heat treatment, the carbon atoms are recrystallized and re-ordered, so as to present the crystal structure of graphite, thereby having excellent properties such as electrical conductivity, thermal conductivity, and chemical and thermal stability of graphite. Therefore, it is necessary to convert the carbonaceous material into artificial graphite material by using a graphitization furnace, so as to apply the graphite material to the production and preparation of the battery negative electrode material.

[0061] During long-time operation of the graphitization furnace, abnormal working conditions (such as coking in the furnace) are prone to occur, so that a large amount of volatile substances (such as methane, hydrogen and hydrogen sulfide) are accumulated in the furnace. If the large amount of volatile substances cannot be discharged in time, a positive pressure state will be formed in the furnace, causing other substances in the furnace to be ejected outside the furnace body, resulting in operation failure of the graphitization furnace and affecting the electrical reliability and operation stability of the graphitization furnace.

[0062] Based on the above considerations, in order to solve the problem that the volatile substances are accumulated in the furnace under abnormal working conditions of the graphitization furnace, affecting the electrical reliability and operation stability of the graphitization furnace, one or more embodiments of the present application provide a graphitization furnace. Through the cooperation of the furnace body 10, the tail gas treatment device 20 and the liquid sealing device 30, the liquid in the liquid sealing tank 32 performs liquid sealing on the access pipe 31 during normal operation of the graphitization furnace, so that the tail gas treatment device 20 smoothly extracts the high-temperature flue gas generated in the reaction chamber 11 through the tail gas pipe 21 and recovers heat from the high-temperature flue gas. When the graphitization furnace appears abnormal working conditions, the access pipe 31 introduces a large amount of volatile substances generated in the reaction chamber 11 into the liquid sealing tank 32 along with the high-temperature flue gas, the liquid in the liquid sealing tank 32 depressurizes the flue gas stream carrying a large amount of volatile substances, and the depressurized flue gas stream is discharged through the exhaust pipe 33. In this way, the probability of a large amount of volatile substances accumulating in the reaction chamber 11 and affecting the normal operation of the graphitization furnace is reduced, and the electrical reliability and operation stability of the graphitization furnace are improved.

[0063] The graphitization furnace provided by the embodiments of the present application refers to a device for high-temperature sintering of carbonaceous materials, recrystallization of carbon atoms, and reordering of carbon atoms to convert into artificial graphite materials.

[0064] Referring to Figure 1 and Figure 2 , the embodiments of the present application provide a graphitization furnace, which comprises a furnace body 10, a tail gas treatment device 20 and a liquid sealing device 30.

[0065] The furnace body 10 has a reaction chamber 11. The tail gas treatment device 20 is communicated with the reaction chamber 11 through a tail gas pipe 21, and is used for extracting flue gas in the reaction chamber 11.

[0066] The liquid sealing device 30 comprises an access pipe 31, a liquid sealing tank 32 and an exhaust pipe 33. The liquid sealing tank 32 stores liquid. One end of the access pipe 31 is communicated with the tail gas pipe 21, and the other end is communicated with the liquid sealing tank 32 and extends below the liquid level of the liquid sealing tank 32. The exhaust pipe 33 is communicated with the liquid sealing tank 32 and is located above the liquid level of the liquid sealing tank 32.

[0067] The reaction chamber 11 can introduce at least part of the flue gas into the access pipe 31 under a positive pressure state.

[0068] It should be noted that the reaction chamber 11 of the furnace body 10 refers to a reaction chamber in which carbonaceous materials are subjected to high-temperature heat treatment to convert the carbonaceous materials into graphite materials. When the carbonaceous materials react in the reaction chamber 11, a large amount of high-temperature flue gas is generated. The tail gas treatment device 20 is connected to the reaction chamber 11 through the tail gas pipe 21 to extract the high-temperature flue gas generated in the reaction chamber 11 to recover the heat in the high-temperature flue gas.

[0069] The tail gas treatment device 20 can be, but is not limited to, a waste heat boiler device, a heat exchanger, etc. The tail gas treatment device 20 can also be a waste heat recovery system. For example, the tail gas treatment device 20 can include a fan, a tail gas incinerator, and conventional structures in a waste heat recovery system, wherein the fan extracts the high-temperature flue gas through the tail gas pipe 21 to the tail gas incinerator, the tail gas incinerator completely burns the combustible materials in the high-temperature flue gas, fully releases the heat in the high-temperature flue gas, and finally recovers the heat released by the combustion of the combustible materials in the high-temperature flue gas and the original heat in the high-temperature flue gas through the waste heat boiler. In this way, the energy utilization rate is improved.

[0070] The liquid in the liquid seal tank 32 does not react with the substances in the high-temperature flue gas. The liquid in the liquid seal tank 32 can be, but is not limited to, pure water, inorganic chlorine ion-containing solution, etc. For example, the liquid in the liquid seal tank 32 is pure water, which reduces the cost of the corresponding equipment.

[0071] It should be understood that when the graphitization furnace is in normal operation, the inside of the reaction chamber 11 is in a slightly negative pressure state, which is beneficial to the extraction of the high-temperature flue gas generated in the reaction chamber 11 by the tail gas treatment device 20 through the tail gas pipe 21.

[0072] In the present application, the liquid seal device 30 is arranged outside the furnace body 10. The liquid seal device 30 is located between the furnace body 10 and the tail gas treatment device 20. The access pipe 31 of the liquid seal device 30 can be connected to the tail gas pipe 21 as a bypass pipe of the tail gas pipe 21. The liquid seal tank 32 is a sealed tank structure. One end of the access pipe 31 is connected to the tail gas pipe 21, and the other end of the access pipe 31 is located in the cavity of the liquid seal tank 32 and immersed in the liquid surface of the liquid seal tank 32. One end of the exhaust pipe 33 is located in the cavity of the liquid seal tank 32 and above the liquid surface of the liquid seal tank 32. One end of the exhaust pipe 33 can be connected to a terminal treatment device. The terminal treatment device recovers and secondarily treats the gas discharged from the exhaust pipe 33.

[0073] It should be noted that when the graphitization furnace is in normal operation, the liquid in the liquid seal tank 32 has a liquid sealing effect on the access pipe 31, which can maintain the pressure in the access pipe 31 stable. The high-temperature flue gas generated in the reaction chamber 11 is only extracted into the tail gas treatment device 20 under the suction of the tail gas treatment device 20 for heat recovery. The high-temperature flue gas cannot enter the liquid seal tank 32 through the access pipe 31 and be discharged from the exhaust pipe 33, so that the tail gas treatment device 20 can more fully recover the heat of the high-temperature flue gas.

[0074] When the abnormal condition (such as coking in the reaction chamber) of the graphitization furnace occurs, and the volatile generated in the reaction is gathered in the reaction chamber 11, the positive pressure is formed in the reaction chamber 11, so that the pressure in the access pipe 31 is greater than the hydrostatic pressure in the liquid tank 32. At this time, at least part of the high-temperature flue gas carrying the volatile will enter the liquid in the liquid tank 32 through the access pipe 31. The continuous high-temperature flue gas flow is dispersed into discontinuous bubbles under the action of liquid resistance, and finally discharged through the exhaust pipe 33. In this way, the flue gas flow is depressurized, and a large amount of volatile generated in the reaction chamber 11 due to abnormal conditions is discharged in time, so that the reaction chamber 11 returns to a slightly negative pressure state. In this way, the probability of the large amount of volatile gathering in the reaction chamber 11 and affecting the normal operation of the graphitization furnace is reduced, and the electrical reliability and operation stability of the graphitization furnace are improved.

[0075] It is not difficult to understand that the graphitization furnace of the embodiment of the present application is cooperatively arranged by the furnace body 10, the tail gas treatment device 20 and the liquid sealing device 30. The liquid in the liquid tank 32 liquid seals the access pipe 31 during the normal operation of the graphitization furnace, so that the tail gas treatment device 20 smoothly extracts the high-temperature flue gas generated in the reaction chamber 11 through the tail gas pipe 21 and recovers the heat of the high-temperature flue gas. When the abnormal condition of the graphitization furnace occurs, the access pipe 31 introduces a large amount of volatile generated in the reaction chamber 11 into the liquid tank 32 along with the high-temperature flue gas. The liquid in the liquid tank 32 depressurizes the flue gas flow carrying a large amount of volatile, and discharges the depressurized flue gas flow through the exhaust pipe 33. In this way, the probability of the large amount of volatile gathering in the reaction chamber 11 and affecting the normal operation of the graphitization furnace is reduced, and the electrical reliability and operation stability of the graphitization furnace are improved.

[0076] In some embodiments of the present application, referring to Figure 2 , the ratio of the liquid level depth of the liquid tank 32 to the length of the access pipe 31 extending into the liquid in the liquid tank 32 is 100-700.

[0077] Specifically, L1 is defined as the length of the access pipe 31 extending into the liquid in the liquid tank 32, and L2 is defined as the liquid level depth of the liquid tank 32. L2 / 700≤L1≤L2 / 100.

[0078] It should be noted that when the length of the access pipe 31 extending into the liquid in the liquid seal tank 32 is too long, that is, the gas outlet port of the access pipe 31 is closer to the bottom of the liquid seal tank 32, the high-temperature flue gas carrying a large amount of volatile components flowing out of the gas outlet port of the access pipe 31 is more likely to be washed to the bottom of the liquid seal tank 32, causing the structure of the liquid seal tank 32 to be damaged. When the length of the access pipe 31 extending into the liquid in the liquid seal tank 32 is shorter, for example, the gas outlet port of the access pipe 31 is close to the liquid surface, the liquid in the liquid seal tank 32 has a poor dispersion effect on the flue gas stream carrying a large amount of volatile components and having a high pressure, resulting in a poor pressure relief effect on the flue gas stream.

[0079] Therefore, by setting the ratio of the liquid level depth of the liquid seal tank 32 to the length of the access pipe 31 extending into the liquid in the liquid seal tank 32 to be 100-700, when the access pipe 31 introduces the flue gas stream carrying a large amount of volatile components into the liquid in the liquid seal tank 32 during abnormal conditions of the graphitization furnace, the flue gas stream can be dispersed by a large liquid resistance, reducing the probability of a large amount of volatile components accumulating in the reaction chamber 11 and affecting the normal operation of the graphitization furnace, and also reducing the erosion damage of the flue gas stream to the liquid seal tank 32

[0080] It should be noted that during the process of the liquid in the liquid seal tank 32 relieving the pressure of the flue gas stream carrying a large amount of volatile components, due to the high temperature of the flue gas stream, the liquid in the liquid seal tank 32 is evaporated and consumed during the process of the high-temperature flue gas stream entering the liquid and finally being discharged from the exhaust pipe 33. At the same time, during the long-term normal operation of the graphitization furnace, a small part of the liquid in the liquid seal tank 32 is also evaporated. Therefore, whether the graphitization furnace is in normal operation or abnormal conditions, the liquid in the liquid seal tank 32 is evaporated and consumed, resulting in insufficient liquid in the liquid seal tank 32, a decrease in the liquid level, and a decrease in the pressure relief effect on the flue gas stream.

[0081] Based on this, in some embodiments of the present application, referring to Figure 2 , the liquid seal device 30 further comprises a liquid supplementing mechanism 34, which communicates with the liquid seal tank 32 and is used to supplement liquid into the liquid seal tank 32.

[0082] Specifically, the liquid supplementing mechanism 34 can be configured as a liquid supplementing pipe, and an operator can manually supplement liquid into the liquid seal tank 32 through the liquid supplementing pipe, so that the amount of liquid in the liquid seal tank 32 meets the use requirements.

[0083] Of course, the liquid supplementing mechanism 34 can also be configured as a cooperation structure of a water pump and a liquid storage tank, and the water pump inputs the liquid in the liquid storage tank into the liquid seal tank 32, so as to automatically supplement the liquid into the liquid seal tank 32.

[0084] It is understandable that by setting the liquid supplement mechanism 34 connected with the liquid seal tank 32, the liquid supplement mechanism 34 supplements the liquid in the liquid seal tank 32 in time, overcomes the problem that the liquid in the liquid seal tank 32 is difficult to meet the use demand due to evaporation consumption, and makes the liquid in the liquid seal tank 32 maintain a better liquid sealing effect and pressure relief effect on the flue gas flow.

[0085] In some embodiments of the present application, referring to Figure 2 The liquid seal device 30 further comprises a liquid level detection mechanism 35 arranged in the liquid seal tank 32, and the liquid level detection mechanism 35 is used for detecting the liquid level of the liquid seal tank 32.

[0086] Specifically, the liquid seal tank 32 is provided with a first liquid level H1 and a second liquid level H2, the second liquid level H2 is higher than the first liquid level H1, and the connecting pipe 31 is located below the first liquid level H1 away from the one end of the tail gas pipe 21.

[0087] The liquid level detection mechanism 35 comprises a first liquid level detection member 351 and a second liquid level detection member 352 arranged in the liquid seal tank 32, the first liquid level detection member 351 is used for detecting whether the liquid level of the liquid seal tank 32 reaches the first liquid level H1, and the second liquid level detection member 352 is used for detecting whether the liquid level of the liquid seal tank 32 reaches the second liquid level H2. The first liquid level detection member 351 can be but is not limited to a capacitive liquid level detection plate, a float type liquid level sensor, etc., and similarly, the second liquid level detection member 352 can be but is not limited to a capacitive liquid level detection plate, a float type liquid level sensor, etc.

[0088] The graphitization furnace of the embodiments of the present application further comprises a controller (not shown in the figure), the first liquid level detection member 351, the second liquid level detection member 352 and the liquid supplement mechanism 34 are in electrical communication with the controller.

[0089] It is easy to understand that when the first liquid level detection member 351 detects that the liquid level of the liquid seal tank 32 is lower than the first liquid level H1, it indicates that the liquid amount of the liquid seal tank 32 is insufficient, at this time, the first liquid level detection member 351 transmits the detection signal to the controller, so that the controller controls the liquid supplement mechanism 34 to supplement the liquid in the liquid seal tank 32, so that the liquid amount of the liquid seal tank 32 meets the use demand.

[0090] When the second liquid level detection member 352 detects that the liquid level of the liquid seal tank 32 has reached the second liquid level H2, at this time, the second liquid level detection member 352 transmits the detection signal to the controller, and the controller controls the liquid supplement mechanism 34 to stop supplementing the liquid in the liquid seal tank 32, so that the liquid amount of the liquid seal tank 32 will not be excessive.

[0091] It can be understood that, by the arrangement of the liquid level detection mechanism 35, the liquid level detection mechanism 35 can timely detect the liquid deficiency of the liquid seal tank 32, so that the liquid supplement mechanism 34 timely supplements the liquid to the liquid seal tank 32, the liquid in the liquid seal tank 32 can maintain a better liquid sealing effect and pressure relief effect on the flue gas flow, and the overall linkage of the liquid seal device 30 is enhanced.

[0092] In some embodiments of the present application, referring to Figure 2 The liquid seal device 30 further comprises a waste discharge mechanism 36 communicating with the bottom of the liquid seal tank 32, for discharging the deposits and / or liquid in the liquid seal tank 32.

[0093] It should be noted that the high-temperature flue gas generated by the reaction chamber 11 also carries part of the graphite material particles, and the tail gas pipe 21 and the access pipe 31 are generally metal pipes. During the flow of the high-temperature flue gas in the tail gas pipe 21 and the access pipe 31, the high-temperature flue gas will be in frictional contact with the tail gas pipe 21 and the access pipe 31, so that part of the metal oxide particles will also be carried in the high-temperature flue gas.

[0094] After the flue gas flow carrying the volatile components, graphite material particles and metal oxide particles enters the liquid seal tank 32, the volatile components are dispersed by the liquid and discharged from the exhaust pipe 33, and the graphite material particles and metal oxide particles are deposited at the bottom of the liquid seal tank 32. After long-term use, the graphite material particles and metal oxide particles and other impurities will accumulate at the bottom of the liquid seal tank 32.

[0095] Therefore, by arranging the waste discharge mechanism 36 communicating with the liquid seal tank 32 at the bottom of the liquid seal tank 32, the impurities deposited at the bottom of the liquid seal tank 32 can be discharged with the liquid through the waste discharge mechanism 36 in time, effectively solving the problem that the accumulation of impurity particles at the bottom of the liquid seal tank 32 affects the normal use of the liquid seal tank 32.

[0096] Specifically, the waste discharge mechanism 36 can be configured as an electronic valve and a recovery container cooperation structure. By opening the electronic valve, the impurities deposited at the bottom of the liquid seal tank 32 can be discharged into the recovery container, realizing the waste discharge function.

[0097] In some embodiments of the present application, referring to Figure 2 The graphitization furnace further comprises an explosion-proof device 40 arranged on the pipe wall of the access pipe 31.

[0098] Specifically, the explosion-proof device 40 can be an explosion-proof valve.

[0099] It is easy to understand that the high-temperature flue gas carrying a large amount of volatile components successively flows into the access pipe 31, and the pressure in the access pipe 31 gradually increases. The explosion-proof member 40 can relieve the pressure of the access pipe 31 when the pressure in the access pipe 31 is too large, reduce the probability of explosion of the access pipe 31 due to excessive pressure, and further improve the stability and reliability of the graphitization furnace operation.

[0100] It should be noted that during the graphitization of the carbonaceous material, the core temperature in the reaction chamber 11 can reach above 2300 DEG C, so that the flue gas generated in the reaction chamber 11 is also relatively high in temperature. If a conventional metal pipe is used as the access pipe 31, the access pipe 31 is easily damaged due to excessive heating temperature in the long-term use process, such as collapse, melting, etc., resulting in failure of the liquid seal device 30 and operation failure of the graphitization furnace.

[0101] Based on this, in some embodiments of the present application, referring to Figure 2 、 Figure 4 and Figure 5 , the inner wall of the access pipe 31 is sequentially provided with a first heat preservation layer 311 and a first temperature-resistant layer 312 radially inward, and the first heat preservation layer 311 and the first temperature-resistant layer 312 are stacked.

[0102] Specifically, the projection area of the first heat preservation layer 311 and the first temperature-resistant layer 312 relative to the inner wall of the access pipe 31 coincides with the inner wall area of the access pipe 31, that is, the first heat preservation layer 311 and the first temperature-resistant layer 312 completely adhere to cover the inner wall of the access pipe 31. The first temperature-resistant layer 312 is at the innermost side of the access pipe 31, and the first heat preservation layer 311 is between the first temperature-resistant layer 312 and the inner wall of the access pipe 31.

[0103] The first temperature-resistant layer 312 can be but not limited to a rigid structure, a ceramic fiber product, a silicone gel composition, etc., so that the first temperature-resistant layer 312 has good corrosion resistance, wear resistance and temperature resistance.

[0104] The first heat preservation layer 311 can be but not limited to zirconium cotton, aluminum silicate cotton, carbonaceous heat preservation material, etc., so that the first heat preservation layer 311 has good heat preservation and temperature resistance.

[0105] The access pipe 31 is constructed as a steel pipe, so that the access pipe 31 has good structural strength, and the access pipe 31 provides good support for the first temperature-resistant layer 312 and the first heat preservation layer 311

[0106] It can be understood that when the high-temperature flue gas flows in the access pipe 31, the high-temperature flue gas directly contacts the first temperature-resistant layer 312, and then the heat is conducted to the outermost access pipe 31 through the first temperature-resistant layer 312 and the first heat-insulating layer 311 in turn. By using the good temperature resistance and wear resistance of the first temperature-resistant layer 312 and the good heat insulation performance of the first heat-insulating layer 311, the first temperature-resistant layer 312 and the first heat-insulating layer 311 double-protect the access pipe 31, reduce the heating temperature of the access pipe 31, and further reduce the probability of structural damage of the access pipe 31 due to the excessively high heating temperature, thereby improving the structural stability and service life of the access pipe 31, and thus improving the overall operation stability and reliability of the graphitization furnace.

[0107] In some embodiments, referring to Figure 4 and Figure 5 , the ratio of the thickness of the first heat-insulating layer 311 to the thickness of the first temperature-resistant layer 312 is 5-26, and the ratio of the wall thickness of the access pipe 31 to the thickness of the first temperature-resistant layer 312 is 1-3.2.

[0108] Specifically, referring to Figure 4 and Figure 5 , D1 is defined as the thickness of the first temperature-resistant layer 312, 5 μm≤D1≤50 mm, preferably, 1 mm≤D1≤15 mm; D2 is defined as the thickness of the first heat-insulating layer 311, 50 mm≤D2≤260 mm, preferably, 80 mm≤D2≤150 mm; and D3 is defined as the wall thickness of the access pipe 31, 10 mm≤D3≤32 mm, preferably, 10 mm≤D3≤24 mm.

[0109] It can be easily understood that by setting the ratio of the thickness of the first heat-insulating layer 311 to the thickness of the first temperature-resistant layer 312 to 5-26, the thickness of the first heat-insulating layer 311 is much greater than the thickness of the first temperature-resistant layer 312, so that the first heat-insulating layer 311 and the first temperature-resistant layer 312 have good temperature resistance and heat insulation performance, and the difficulty of heat conduction of the high-temperature flue gas to the wall of the access pipe 31 is increased, thereby reducing the probability of damage of the access pipe 31 due to overheating.

[0110] At the same time, by setting the ratio of the wall thickness of the access pipe 31 to the thickness of the first temperature-resistant layer 312 to 1-3.2, the wall thickness of the access pipe 31 is at least greater than the thickness of the first temperature-resistant layer 312 and less than the thickness of the first heat-insulating layer 311, so that the access pipe 31 has a good supporting effect on the first temperature-resistant layer 312 and the first heat-insulating layer 311, and the material cost of the access pipe 31 is correspondingly reduced.

[0111] Further, referring to Figure 4 and Figure 5The pipe wall thickness of the access pipe 31 is 2mm-50mm; and / or, the thermal conductivity of the access pipe 31 is 30W / (m·k)-100W / (m·k).

[0112] The pipe wall thickness of the access pipe 31 is defined as D3, and 2mm≤D2≤50mm.

[0113] The pipe wall thickness of the access pipe 31 is set in the range of 2mm-50mm, which can make the access pipe 31 have good structural strength, and the thermal conductivity of the access pipe 31 can remain stable, so as to better support and fix the first temperature-resistant layer 312 and the first heat-insulating layer 311.

[0114] It should be noted that in the process of graphitizing the carbonaceous material, the core temperature in the reaction chamber 11 can reach above 2300℃, so that the flue gas temperature generated in the reaction chamber 11 is also relatively high. If a conventional metal pipe is used as the tail gas pipe 21, the tail gas pipe 21 is easy to be structurally damaged due to the excessively high heating temperature in the long-term use process, such as collapse and melting of the tail gas pipe 21, resulting in failure of the liquid seal device 30 and operation failure of the graphitization furnace.

[0115] In addition, considering that the tail gas treatment device 20 needs to extract the high-temperature flue gas in the reaction chamber 11 through the tail gas pipe 21 and perform secondary treatment on the high-temperature flue gas to recover the heat of the high-temperature flue gas, if a conventional metal pipe is used as the tail gas pipe 21, the tail gas pipe 21 will dissipate a large amount of heat of the high-temperature flue gas to the external environment through the pipe wall heat conduction, resulting in low heat recovery efficiency of the tail gas treatment device 20.

[0116] Based on this, in some embodiments of the present application, referring to Figure 2 、 Figure 6 and Figure 7 , the inner wall of the tail gas pipe 21 is sequentially provided with a second heat-insulating layer 211, a lightweight layer 212 and a second temperature-resistant layer 213 in the radial direction, and the second heat-insulating layer 211, the lightweight layer 212 and the second temperature-resistant layer 213 are sequentially stacked and distributed.

[0117] Specifically, the second temperature-resistant layer 213 can but is not limited to adopt a rigid structure, a ceramic fiber product, a silica gel composition, etc., so that the first temperature-resistant layer 312 has good corrosion resistance, wear resistance and temperature resistance.

[0118] The lightweight layer 212 can but is not limited to be a hollow aluminum sphere castable, a high-aluminum castable, and a lightweight mullite castable, so that the lightweight layer 212 has the characteristics of light weight and good heat-insulating performance. The lightweight layer 212 can also be understood as a heat-insulating layer.

[0119] The second heat preservation layer 211 can be, but is not limited to, zirconium cotton, aluminum silicate cotton, carbonaceous heat preservation material, etc., so that the second temperature resistant layer 213 has good heat preservation and temperature resistance.

[0120] It can be understood that, in the normal operation process of the graphitization furnace, the high-temperature flue gas enters the tail gas treatment device 20 along the tail gas pipe 21 for waste heat recovery treatment. When the high-temperature flue gas flows in the tail gas pipe 21, the high-temperature flue gas directly contacts the second temperature resistant layer 213, and heat needs to be transferred to the outermost tail gas pipe 21 pipe wall through the heat conduction of the second temperature resistant layer 213, the lightweight layer 212 and the second heat preservation layer 211. In this process, by using the good temperature resistance and wear resistance of the second temperature resistant layer 213, the intermediate support performance of the lightweight layer 212 and the good heat preservation performance of the second heat preservation layer 211, not only can the direct heating temperature of the tail gas pipe 21 be reduced, thereby reducing the probability of structural damage of the tail gas pipe 21 due to too high heating temperature, but also the heat of the high-temperature flue gas can be locked by the second temperature resistant layer 213, the lightweight layer 212 and the second heat preservation layer 211, reducing the heat conduction and dissipation of the high-temperature flue gas by the pipe wall of the tail gas pipe 21, so as to improve the heat recovery efficiency of the tail gas treatment device 20.

[0121] Further, referring to Figure 6 and Figure 7 , the ratio of the thickness of the lightweight layer 212 to the thickness of the second temperature resistant layer 213 is 5-20, the ratio of the thickness of the second heat preservation layer 211 to the thickness of the second temperature resistant layer 213 is 7-30, and the ratio of the pipe wall thickness of the tail gas pipe 21 to the thickness of the second temperature resistant layer 213 is 1-2.5.

[0122] Specifically, D4 is defined as the thickness of the second temperature resistant layer 213, 5 μm≤D4≤50 mm; D5 is defined as the thickness of the lightweight layer 212, 50 mm≤D5≤200 mm; D6 is defined as the thickness of the second heat preservation layer 211, 70 mm≤D6≤300 mm; and D7 is defined as the pipe wall thickness of the tail gas pipe 21, 10 mm≤D7≤100 mm.

[0123] It can be easily understood that, by setting the ratio of the thickness of the lightweight layer 212 to the thickness of the second temperature resistant layer 213 to be 5-20, the thickness of the lightweight layer 212 is much greater than the thickness of the second temperature resistant layer 213, the lightweight layer 212 has a good supporting effect on the second temperature resistant layer 213, the second temperature resistant layer 213 can better play its temperature resistance, and the material cost of the second temperature resistant layer 213 is reduced.

[0124] By setting the ratio of the thickness of the second heat preservation layer 211 to the thickness of the second temperature resistant layer 213 to 7-30, the thickness of the second heat preservation layer 211 is much greater than the thickness of the second temperature resistant layer 213, the heat preservation effect of the second heat preservation layer 211 on the high-temperature flue gas is improved, and the difficulty of heat conduction of the high-temperature flue gas to the pipe wall of the tail gas pipe 21 is also increased, thereby reducing the probability of overheating and damage of the tail gas pipe 21.

[0125] By setting the ratio of the thickness of the tail gas pipe 21 to the thickness of the second temperature resistant layer 213 to 1-2.5, the thickness of the tail gas pipe 21 is greater than the thickness of the second temperature resistant layer 213 and much smaller than the thicknesses of the lightweight layer 212 and the second heat preservation layer 211, the heat dissipation of the tail gas pipe 21 to the high-temperature flue gas is reduced, and the heat preservation effect of the lightweight layer 212 and the second heat preservation layer 211 on the high-temperature flue gas is also improved, thereby further improving the heat recovery efficiency of the tail gas treatment device 20.

[0126] Further, the thermal conductivity of the second temperature resistant layer 213 is 5W / (m·k)-20W / (m·k), and the temperature resistant temperature of the second temperature resistant layer 213 is 1400℃-1750℃.

[0127] In this way, the second temperature resistant layer 213 can withstand a relatively high temperature and adapt to temperature resistance and heat preservation of the high-temperature flue gas, and the thermal conductivity of the second temperature resistant layer 213 is controlled to be relatively low, thereby improving the temperature resistance and heat preservation effect of the second temperature resistant layer 213 on the high-temperature flue gas.

[0128] Further, the thermal conductivity of the lightweight layer 212 is 0.3W / (m·k)-2W / (m·k), and the temperature resistant temperature of the lightweight layer 212 is 1200℃-1450℃.

[0129] In this way, the lightweight layer 212 can withstand a relatively high temperature and adapt to temperature resistance and heat preservation of the high-temperature flue gas, and the thermal conductivity of the lightweight layer 212 is controlled to be relatively low, thereby improving the temperature resistance and heat preservation effect of the lightweight layer 212 on the high-temperature flue gas.

[0130] Further, the thermal conductivity of the second heat preservation layer 211 is 0.05W / (m·k)-2W / (m·k), and the temperature resistant temperature of the second heat preservation layer 211 is 1100℃-1350℃.

[0131] In this way, the second heat preservation layer 211 can withstand a relatively high temperature and adapt to temperature resistance and heat preservation of the high-temperature flue gas, and the thermal conductivity of the second heat preservation layer 211 is controlled to be relatively low, thereby improving the temperature resistance and heat preservation effect of the second heat preservation layer 211 on the high-temperature flue gas.

[0132] In some embodiments of the present application, the thickness of the pipe wall of the tail gas pipe 21 is 6μm-50mm, and the thermal conductivity of the tail gas pipe 21 ranges from 300W / (m·k) to 600W / (m·k).

[0133] Referring to Figure 6 and Figure 7 D7 is defined as the thickness of the pipe wall of the tail gas pipe 21, 2 μm≤D7≤50 mm.

[0134] The thickness of the pipe wall of the tail gas pipe 21 is set in the range of 2 μm-50 mm, which can make the tail gas pipe 21 have good structural strength, and the thermal conductivity of the access pipe 31 can be kept stable, so as to better support and fix the second temperature-resistant layer 213, the light layer 212 and the second heat preservation layer 211.

[0135] By setting the thermal conductivity of the tail gas pipe 21 to be controlled in the range of 300 W / (m·k)-600 W / (m·k), the thermal conductivity of the second temperature-resistant layer 213, the light layer 212 and the second heat preservation layer 211 is worse than that of the pipe wall of the tail gas pipe 21, so that the second temperature-resistant layer 213, the light layer 212 and the second heat preservation layer 211 better insulate the high-temperature flue gas, and further improve the heat recovery efficiency of the tail gas treatment device 20.

[0136] In some embodiments of the present application, referring to Figure 1 , the first temperature detection member 22 and the second temperature detection member 23 are respectively arranged at the inlet and the outlet of the tail gas pipe 21.

[0137] Specifically, the first temperature detection member 22 is arranged at a distance of 10 m from the inlet end of the tail gas pipe 21, and the second temperature detection member 23 is arranged at a distance of 10 m from the outlet end of the tail gas pipe 21.

[0138] Therefore, the inlet temperature of the tail gas pipe 21 is detected by the first temperature detection member 22, and the outlet temperature of the tail gas pipe 21 is detected by the second temperature detection member 23, so as to monitor the actual temperature inside the tail gas pipe 21. If the actual temperature inside the tail gas pipe 21 is too high, the tail gas treatment device 20 correspondingly reduces the suction rate of the high-temperature flue gas, thereby reducing the probability of overheating damage to the functional components of the tail gas treatment device 20 caused by excessive concentration of the high-temperature flue gas, and improving the operation stability and reliability of the tail gas treatment device 20.

[0139] In addition, the present application also provides a battery production system, which comprises the graphitization furnace described above, and the graphitization furnace is used for preparing a negative electrode material of a battery.

[0140] In the present application, the battery production system can be a battery production line, and a plurality of devices in the battery production line can be arranged in the same centralized place, or can also be arranged in separate places.

[0141] It is understandable that the battery production system of the embodiment of the application, due to the configuration of the graphitization furnace described above, also has the same technical effects brought by the graphitization furnace, that is, it can effectively reduce the probability of a large amount of volatile substances gathering in the reaction chamber 11 and affecting the normal operation of the graphitization furnace, and improve the electrical reliability and stability of the operation of the graphitization furnace.

[0142] Referring to Figures 1 to 7 The embodiment of the application provides a graphitization furnace, which comprises a furnace body 10 having a reaction chamber 11; a tail gas treatment device 20 communicating with the reaction chamber 11 through a tail gas pipe 21, used for extracting flue gas in the reaction chamber 11; and a liquid sealing device 30 comprising an access pipe 31, a liquid sealing tank 32 and an exhaust pipe 33, the liquid sealing tank 32 storing liquid, one end of the access pipe 31 communicating with the tail gas pipe 21 and the other end communicating with the liquid sealing tank 32 and extending below the liquid level of the liquid sealing tank 32, and the exhaust pipe 33 communicating with the liquid sealing tank 32 and being located above the liquid level of the liquid sealing tank 32; wherein the reaction chamber 11 can guide at least part of the flue gas to the access pipe 31 through the tail gas pipe 21 under a positive pressure state.

[0143] The graphitization furnace of the embodiment of the application is provided by cooperation of the furnace body 10, the tail gas treatment device 20 and the liquid sealing device 30, the liquid in the liquid sealing tank 32 performs liquid sealing on the access pipe 31 during the normal operation of the graphitization furnace, so that the tail gas treatment device 20 smoothly extracts the high-temperature flue gas generated in the reaction chamber 11 through the tail gas pipe 21 and recovers heat from the high-temperature flue gas. When abnormal conditions occur in the graphitization furnace, the access pipe 31 introduces a large amount of volatile substances generated in the reaction chamber 11 into the liquid sealing tank 32 along with the high-temperature flue gas, the liquid in the liquid sealing tank 32 depressurizes the flue gas stream carrying a large amount of volatile substances, and the depressurized flue gas stream is discharged through the exhaust pipe 33, so as to reduce the probability of a large amount of volatile substances gathering in the reaction chamber 11 and affecting the normal operation of the graphitization furnace, and improve the electrical reliability and stability of the operation of the graphitization furnace.

[0144] The technical features of the above-described embodiments can be combined arbitrarily, and in order to make the description concise, all possible combinations of the technical features in the above-described embodiments are not described, however, as long as the combinations of the technical features do not exist contradictory, they should be considered as the scope of the description.

[0145] The above-described embodiments only express several implementation manners of the application, the description is relatively specific and detailed, but it should not be understood as a limitation on the patent application scope. It should be pointed out that for ordinary skilled persons in the art, several modifications and improvements can be made without departing from the concept of the application, and these all belong to the protection scope of the application. Therefore, the protection scope of the patent of the application should be subject to the appended claims.

Claims

1. A graphitization furnace, characterized in that: include: The furnace body has a reaction chamber; An exhaust gas treatment device, connected to the reaction chamber through an exhaust pipe, for extracting the flue gas in the reaction chamber; The liquid sealing device includes an access pipe, a liquid sealing tank, and an exhaust pipe. The liquid sealing tank contains liquid. One end of the access pipe is connected to the exhaust pipe, and the other end is connected to the liquid sealing tank and extends below the liquid level in the liquid sealing tank. The exhaust pipe is connected to the liquid sealing tank and is located above the liquid level in the liquid sealing tank. Wherein, the reaction chamber can introduce at least part of the flue gas into the access pipe through the tail gas pipe under a positive pressure state.

2. The graphitization furnace according to claim 1, characterized in that The ratio of the liquid level depth of the liquid sealing tank to the length of the access pipe extending into the liquid in the liquid sealing tank is 100-700.

3. The graphitization furnace according to claim 1, characterized in that The liquid sealing device further includes a liquid replenishing mechanism, which is connected to the liquid sealing tank and is used to replenish liquid into the liquid sealing tank.

4. The graphitization furnace according to claim 1 or 3, characterized in that: The liquid sealing device further comprises a liquid level detection mechanism provided in the liquid sealing tank, wherein the liquid level detection mechanism is used to detect the liquid level of the liquid sealing tank.

5. The graphitization furnace according to claim 1, characterized in that The liquid sealing device further comprises a waste discharge mechanism, which is connected to the bottom of the liquid sealing tank and is used to discharge sediment and / or liquid in the liquid sealing tank.

6. The graphitization furnace according to claim 1, characterized in that The graphitization furnace further includes an explosion-proof component, which is arranged on the tube wall of the access tube.

7. The graphitization furnace according to claim 1, characterized in that The inner wall of the access pipe is provided with a first heat-insulating layer and a first heat-resistant layer in sequence radially inward, and the first heat-insulating layer and the first heat-resistant layer are stacked and distributed.

8. The graphitization furnace according to claim 7, characterized in that: The ratio of the thickness of the first heat-insulating layer to the thickness of the first heat-resistant layer is 5-26, and the ratio of the wall thickness of the access pipe to the thickness of the first heat-resistant layer is 1-3.

2.

9. The graphitization furnace according to claim 7 or 8, characterized in that: The wall thickness of the access pipe is 2 mm to 50 mm; and / or the thermal conductivity of the access pipe is 30 W / (m·k) to 100 W / (m·k).

10. The graphitization furnace according to claim 1, characterized in that: The inner wall of the tail pipe is provided with a second thermal insulation layer, a lightweight layer and a second heat-resistant layer in sequence along the radial inward direction. The second thermal insulation layer, the lightweight layer and the second heat-resistant layer are stacked and distributed in sequence.

11. The graphitization furnace according to claim 10, characterized in that: The ratio of the thickness of the lightweight layer to the thickness of the second heat-resistant layer is 5-20, the ratio of the thickness of the second insulation layer to the thickness of the second heat-resistant layer is 7-30, and the ratio of the thickness of the exhaust pipe wall to the thickness of the second heat-resistant layer is 1-2.

5.

12. The graphitization furnace according to claim 10 or 11, characterized in that: The thermal conductivity of the second temperature-resistant layer is 5W / (m·K)-20W / (m·K).

13. The graphitization furnace according to claim 10 or 11, characterized in that: The thermal conductivity of the lightweight layer is 0.3W / (m·k)-2W / (m·k).

14. The graphitization furnace according to claim 10 or 11, characterized in that: The thermal conductivity of the second thermal insulation layer is 0.05W / (m·k)-2W / (m·k).

15. The graphitization furnace according to claim 10 or 11, characterized in that: The wall thickness of the tail gas pipe is 6 μm-50 mm; and / or the thermal conductivity of the tail gas pipe is in the range of 300 W / (m·K)-600 W / (m·K).

16. The graphitization furnace according to claim 1, characterized in that A first temperature detecting component and a second temperature detecting component are respectively provided at the inlet and the outlet of the tail gas pipe.

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