Tail gas treatment system and graphitization furnace

Abstract

The utility model relates to a tail gas treatment system and a graphitization furnace, and the tail gas treatment system comprises a dust removal device which communicates with a tail gas outlet of the graphitization furnace and is used for carrying out dust removal on first tail gas; the combustion device communicates with an outlet of the dust removal device and is used for combusting and oxidizing second tail gas discharged by the dust removal device; the adjusting device is communicated between the dust removal device and the combustion device, and the adjusting device is used for introducing second tail gas exhausted by the dust removal device and introducing fresh air into the second tail gas so as to adjust the concentration of the second tail gas; and the treatment equipment communicates with an outlet of the combustion device and is used for purifying the third tail gas discharged by the combustion device. According to the tail gas treatment system, the dust removal device carries out dust removal on the first tail gas discharged by the graphitization furnace in advance, the dust concentration in the first tail gas is reduced, the dust concentration in the tail gas entering the rear-end combustion device and the treatment equipment is low, and the operation reliability and stability of the rear-end combustion device and the treatment equipment are improved.

Description

Technical Field

[0001] This application relates to the technical field of graphite furnace tail gas treatment, and in particular to a tail gas treatment system and a graphite furnace. Background Art

[0002] During the graphitization process of carbonaceous materials in a graphite furnace through high-temperature reactions, a large amount of harmful tail gas is generated. The main components of the harmful tail gas are dust particles, VOCs (organic waste gas), carbon and oxides, sulfur and oxides, etc., and the harmful tail gas needs to be secondary treated.

[0003] In the related art, there are defects in the current treatment methods for the harmful tail gas generated by graphite furnaces, which are likely to reduce the operation reliability and stability of the backend equipment. Summary of the Utility Model

[0004] This application aims to solve the problem that the current treatment methods for the harmful tail gas generated by graphite furnaces have defects and are likely to reduce the operation reliability and stability of the backend equipment. For this purpose, this application provides a tail gas treatment system.

[0005] In a first aspect, this application provides a tail gas treatment system. The tail gas treatment system is used to treat the first tail gas discharged from a graphite furnace. The tail gas treatment system includes:

[0006] A dust removal device, which is connected to the tail gas outlet of the graphite furnace and is used to remove dust from the first tail gas;

[0007] A combustion device, which is connected to the outlet of the dust removal device and is used to burn and oxidize the second tail gas discharged from the dust removal device;

[0008] A treatment device, which is connected to the outlet of the combustion device and is used to purify the third tail gas discharged from the combustion device.

[0009] The tail gas treatment system according to the first aspect of this application has at least the following beneficial effects:

[0010] The tail gas treatment system of this application, through the sequential cooperation of the dust removal device, the combustion device and the treatment device, the dust removal device pre-removes dust from the first tail gas discharged from the graphite furnace, reduces the dust concentration in the first tail gas, so that the dust concentration in the tail gas entering the backend combustion device and treatment device is relatively low, thereby reducing the risk of dust explosion when the combustion device and the treatment device treat the tail gas, improving the operation reliability and stability of the backend combustion device and treatment device. At the same time, through the combustion device and the treatment device sequentially performing combustion and secondary purification treatment on the pre-dusted tail gas, the tail gas discharged at the end of the system meets the emission standards and reduces environmental pollution.

[0011] In some embodiments, the dust removal device includes a first dust collector and a second dust collector. The tail gas outlet of the graphitization furnace, the first dust collector, the second dust collector, and the combustion device are connected in sequence. The first dust collector is used to remove the first particulate matter in the first tail gas, and the second dust collector is used to remove the second particulate matter in the first tail gas. The diameter of the first particulate matter is greater than that of the second particulate matter.

[0012] In this way, by sequentially removing the coarse particulate matter and fine particulate matter in the first tail gas through the first dust collector and the second dust collector, the dust removal efficiency of the first tail gas is improved, the dust concentration in the first tail gas is reduced, and the risk of dust explosion in the subsequent combustion device and treatment equipment is further reduced.

[0013] In some embodiments, the inlet of the dust removal device is connected to the tail gas outlet of the graphitization furnace through a first pipeline, and a first flame arrester and a first check valve are provided on the first pipeline.

[0014] In this way, the first flame arrester can prevent the flame in the first pipeline from spreading into the graphitization furnace, improving the operation stability of the system. The first check valve can prevent the first tail gas in the first pipeline from flowing back into the graphitization furnace, improving the operation reliability and stability of the tail gas treatment system.

[0015] In some embodiments, the tail gas treatment system further includes an adjustment device. The adjustment device is connected between the dust removal device and the combustion device. The adjustment device is used to introduce the second tail gas discharged from the dust removal device and introduce fresh air into the second tail gas to adjust the concentration of the second tail gas.

[0016] In this way, after the adjustment device introduces the second tail gas discharged from the dust removal device, fresh air is introduced into the second tail gas at the same time. The fresh air is mixed with the second tail gas to adjust the concentration of the second tail gas, thereby reducing the concentration of combustible gas and dust in the second tail gas to below the explosion limit, and further reducing the risk of explosion in the subsequent combustion device and treatment equipment.

[0017] In some embodiments, the adjustment device includes a mixing air regulator and a blower. The mixing air regulator is used to introduce the second tail gas, and the blower is used to supply fresh air to the mixing air regulator to mix the second tail gas with the fresh air.

[0018] In this way, the concentration of the second tail gas is adjusted, thereby reducing the concentration of combustible gas and dust in the second tail gas to below the explosion limit, and further reducing the risk of explosion in the subsequent combustion device and treatment equipment.

[0019] In some embodiments, there are at least two blowers, and at least part of the blowers are connected in parallel.

[0020] In this way, at least one air blower can be selectively enabled and at least one air blower can be reserved as a backup. When the enabled air blower fails, the backup air blower can be enabled. In this way, when the air blower fails, the probability of explosion due to excessive concentration of combustible gas in the air mixing regulator and its subsequent equipment can be reduced.

[0021] In some embodiments, the outlet of the air mixing regulator is connected to the combustion device through a second pipeline, and a temperature detector and / or a combustible gas detector are provided on the second pipeline. The temperature detector is used to detect the temperature inside the second pipeline, and the combustible gas detector is used to detect the concentration of combustible gas inside the second pipeline.

[0022] In this way, the temperature detector and / or the combustible gas detector can be linked with the air blower to monitor the temperature of the system pipeline and / or the concentration of combustible gas in the pipeline in real time, improving the stability of the system.

[0023] In some embodiments, the processing device includes a desulfurization device, and the desulfurization device is connected to the outlet of the combustion device. The desulfurization device is used to remove atmospheric pollutants in the third tail gas.

[0024] In this way, gaseous pollutants such as nitrogen oxides, sulfur dioxide, and sulfur trioxide in the third tail gas are removed, realizing the filtration and purification of the third tail gas, and making the flue gas discharged at the end meet the emission standards.

[0025] In some embodiments, the outlet of the combustion device is connected to the desulfurization device through a third pipeline, and an air extractor is provided on the third pipeline.

[0026] In this way, the third tail gas discharged from the combustion device is introduced into the desulfurization device through the air extractor for desulfurization and denitrification treatment, removing gaseous pollutants such as nitrogen oxides, sulfur dioxide, and sulfur trioxide in the third tail gas, and improving the purification efficiency of the third tail gas.

[0027] In some embodiments, there are at least two third pipelines, and all the third pipelines are connected in parallel.

[0028] In this way, at least one air extractor can be selectively enabled and at least one air extractor can be reserved as a backup. When the enabled air extractor fails, the backup air extractor can be enabled, so that the tail gas flows orderly and smoothly along the pipeline of the tail gas treatment system, improving the operation stability of the system.

[0029] In a second aspect, the present application provides a graphitization furnace, and the graphitization furnace includes the above-mentioned tail gas treatment system.

[0030] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application, it can be implemented according to the content of the specification. And in order to make the above and other purposes, features and advantages of this application more obvious and understandable, the specific embodiments of this application are specifically given below. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] By reading the following detailed description of the preferred embodiments, various other advantages and benefits will become clear to those of ordinary skill in the art. The drawings are only for the purpose of illustrating the preferred embodiments and are not considered to be a limitation of this application. Moreover, in all the drawings, the same reference numerals are used to represent the same components. In the drawings:

[0032] Figure 1 is a schematic structural diagram of the tail gas treatment system according to an embodiment of this application.

[0033] Figure 2 is another schematic structural diagram of the tail gas treatment system according to an embodiment of this application.

[0034] Figure 3 is a schematic structural diagram of the treatment equipment according to an embodiment of this application.

[0035] Description of reference numerals: Dust removal device 100; First dust collector 110; First pressure relief mechanism 111; Second dust collector 120; Combustion device 200; Treatment equipment 300; Desulfurization device 310; Water tank 311; Cyclone layer 312; Packing layer 313; Spraying layer 314; Demisting layer 315; Chimney 316; Water pump 317; Adjusting device 400; Air mixing regulator 410; Air blower 420; Graphitization furnace 500; First discharge pipe 510; First relief valve 520; First pipeline 10; First flame arrester 11; First check valve 12; Oxygen detector 13; First on-off valve 14; Nitrogen delivery mechanism 15; Flow detector 16; Second pipeline 20; Temperature detector 21; Combustible gas detector 22; Second flame arrester 23; Third pipeline 30; Induced draft fan 31; Second discharge pipe 32; Second relief valve 33; Second on-off valve 34; Fourth on-off valve 35; Fourth pipeline 40; Third on-off valve 41. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0036] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the drawings in the embodiments of this application. Obviously, the described embodiments are only a part of the embodiments of this application, rather than all the embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of this application.

[0037] 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., the orientation or positional relationship indicated by these terms is based on the orientation or positional relationship shown in the drawings. These are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present application.

[0038] In addition, if there are terms such as "first" and "second", these terms are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present application, if there is a term "plurality", the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise specifically and clearly defined.

[0039] In the present application, unless otherwise clearly specified and limited, if there are terms such as "mounted", "connected", "coupled", "fixed", etc., these terms should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements or the interaction relationship between two elements, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0040] In the present application, unless otherwise clearly specified and limited, if there is a description such as a first feature being "on" or "under" a second feature, the meaning may be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may mean that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0041] It should be noted that if an element is referred to as "fixed to" or "disposed on" another element, it can be directly on the other element or there may also be an intermediate element. If an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time. If present, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are only for the purpose of illustration and do not represent the only implementation.

[0042] This application relates to a graphitization furnace, which can convert carbon atoms from a turbostratic structure into an ordered graphite crystal structure by heating, and is used to realize the graphitization treatment of non-graphitic carbon. Graphitization is to improve the thermal and electrical conductivity of carbon materials, improve the thermal shock resistance and chemical stability of carbon materials, make carbon materials have lubricity and abrasion resistance, improve the purity of carbon materials, reduce the hardness of carbon materials, and make them easier to machine, etc.

[0043] At present, graphitization furnaces can be mainly used for high-temperature treatments such as sintering and graphitization of carbon materials, graphitization of polyimide (Polyimide Film), PI film, graphitization of thermal conductive materials, sintering of carbon fiber ropes, sintering and graphitization of carbon fiber filaments, graphite purification, and other materials that can be graphitized in a carbon environment. In some specific applications, the graphite materials processed by the graphitization furnace can be used to form the negative electrode materials of batteries. For example, graphite can be used as a main negative electrode material for current lithium batteries.

[0044] In this application, a battery refers to a physical module that includes one or more battery cells to provide electrical energy. A battery generally includes a box for encapsulating one or more battery cells. Optionally, the battery cells can include lithium-ion secondary batteries, lithium-ion primary batteries, lithium-sulfur batteries, sodium-lithium-ion batteries, sodium-ion batteries, magnesium-ion batteries, etc., and the embodiments of this application are not limited thereto. Among them, graphite can be used as the negative electrode active material of the battery cell, and cooperate with the positive electrode active material of the battery cell, such as lithium cobaltate, lithium iron phosphate, ternary lithium or lithium manganate, etc., to realize the movement of metal ions to form an electric current.

[0045] When producing graphite materials through a graphitization furnace, it is necessary to subject the carbonaceous material to a high-temperature reaction in the reaction chamber of the graphitization furnace for graphitization, so as to be converted into a more stable graphite material. A large amount of harmful tail gas will be generated during the graphitization process of the carbonaceous material in the reaction chamber.

[0046] In the related art, the treatment method for harmful tail gas is as follows: the harmful tail gas generated by the graphitization furnace is successively introduced into a combustion device and a dust collector. The combustion device oxidizes and burns combustibles such as VOCs (organic waste gas), H2S (hydrogen sulfide), and CO (carbon monoxide) in the harmful tail gas, and then the dust collector removes dust from the harmful tail gas that has passed through the combustion of the combustion device to remove dust particles in the harmful tail gas.

[0047] However, during the graphitization process of carbonaceous materials in the graphitization furnace, asphalt is usually used as a binder. During high-temperature treatment, asphalt may decompose or volatilize, generating volatile organic compounds and dust, and high temperature will accelerate the decomposition and volatilization of asphalt, increasing the amount of dust, resulting in a large amount of dust in the harmful tail gas discharged from the graphitization furnace, making the dust concentration in the harmful tail gas relatively high, leading to a large explosion risk when the combustion device burns the harmful tail gas, and reducing the operating reliability and stability of the combustion device and the equipment at the rear end of the combustion device.

[0048] Generally speaking, the current treatment method of first burning and then dust removing the harmful tail gas generated by the graphitization furnace has relatively large defects, which will increase the explosion risk of the combustion device and reduce the operating reliability and stability of the combustion device and the equipment at the rear end of the combustion device.

[0049] Based on this, in order to solve the problem that the current treatment method for the harmful tail gas generated by the graphitization furnace is likely to reduce the operating reliability and stability of the rear-end treatment equipment, one or more embodiments of the present application provide a tail gas treatment system. Through the sequential cooperation of a dust removal device, a combustion device, and a treatment device, the dust removal device pre-dusts the first tail gas discharged from the graphitization furnace, reducing the dust concentration in the first tail gas, so that the dust concentration in the tail gas entering the rear-end combustion device and treatment equipment is relatively low, thereby reducing the risk of dust explosion when the combustion device and the treatment equipment treat the tail gas, improving the operating reliability and stability of the rear-end combustion device and treatment equipment. At the same time, through the combustion device and the treatment device successively burning and performing secondary purification treatment on the tail gas after pre-dust removal, the tail gas discharged at the end of the system meets the emission standards and reduces environmental pollution.

[0050] See Figure 1 , an embodiment of the present application provides a tail gas treatment system. The tail gas treatment system is used to treat the first tail gas discharged from the graphitization furnace 500. The tail gas treatment system includes a dust removal device 100, a combustion device 200, and a treatment device 300.

[0051] The dust removal device 100 is connected to the tail gas outlet of the graphitization furnace 500 and is used for removing dust from the first tail gas. The combustion device 200 is connected to the outlet of the dust removal device 100 and is used for burning and oxidizing the second tail gas discharged from the dust removal device 100. The treatment device 300 is connected to the outlet of the combustion device 200 and is used for purifying the third tail gas discharged from the combustion device 200.

[0052] It should be noted that in this application, the first tail gas discharged from the graphitization furnace 500 is the initial tail gas, and the first tail gas contains volatile organic compounds, hydrogen sulfide, carbon monoxide, carbon dioxide, hydrogen, water vapor, sulfides, nitrogen oxides, dust particles, and a small amount of hydrocarbon gases such as methane.

[0053] In this application, the dust removal device 100 refers to a device that can remove dust from the first tail gas discharged from the graphitization furnace 500 to remove dust and particles in the first tail gas and reduce the dust concentration in the first tail gas. The dust removal device 100 can be, but is not limited to, a bag filter, an electrostatic precipitator, a wet scrubber, a cyclone separator, etc., or can also be a device combined with multiple dust collectors, such as a cyclone separator + bag filter or an electrostatic precipitator + wet scrubber.

[0054] Specifically, the dust removal device 100 is directly installed at the discharge outlet of the graphitization furnace 500 to remove dust from the first tail gas in advance before the first tail gas is oxidized and burned, reduce the dust concentration in the first tail gas, reduce the risk of dust explosion in the subsequent combustion device 200, and improve the operation reliability and stability of the combustion device and the equipment behind the combustion device. After the dust removal device 100 removes dust from the first tail gas, the discharged tail gas is the second tail gas with a lower dust concentration.

[0055] In this application, the combustion device 200 refers to a device that can burn and oxidize the second tail gas discharged after being dust-removed by the dust removal device 100. The combustion device 200 can be, but is not limited to, a catalytic oxidation device, a direct combustion device, a combustion chamber, etc. Exemplarily, the combustion device 200 adopts a catalytic oxidation device, and the catalyst in the catalytic oxidation device reduces the combustion reaction temperature, promotes the oxidation of the second tail gas, and can also reduce energy consumption.

[0056] Specifically, the combustion device 200 conducts high-temperature combustion on the second tail gas discharged from the dust removal device 100, oxidizes and burns the volatile organic compounds in the second tail gas into water and carbon dioxide, oxidizes and burns hydrogen sulfide into water and sulfur dioxide, oxidizes and burns carbon monoxide into carbon dioxide, oxidizes and burns hydrogen into water, and burns hydrocarbon gases such as methane into water and carbon dioxide, etc. After the combustion device 200 oxidizes and burns the second tail gas, the discharged tail gas is the third tail gas containing water vapor, carbon dioxide, sulfur dioxide, nitrogen oxides, etc.

[0057] In the present application, the processing device 300 refers to a structural device capable of performing secondary purification treatment on the third tail gas discharged from the combustion device 200. The processing device 300 may include a waste heat recovery device, a desulfurization device, etc. that are sequentially connected through pipelines. Of course, the processing device 300 may also include a secondary dust removal mechanism to perform secondary dust removal on the third tail gas and further remove a small amount of dust and particulate matter in the third tail gas.

[0058] It should be understood that after the processing device 300 performs secondary treatment on the third tail gas discharged from the combustion device 200, the discharged tail gas is green tail gas that meets the emission standards, reducing environmental pollution.

[0059] It is not difficult to understand that through the sequential cooperative arrangement of the dust removal device 100, the combustion device 200, and the processing device 300 in the embodiment of the present application, the dust removal device 100 pre-dusts the first tail gas discharged from the graphitization furnace 500 to reduce the dust concentration in the first tail gas, so that the dust concentration in the tail gas entering the subsequent combustion device 200 and the processing device 300 is relatively low, thereby reducing the risk of dust explosion when the combustion device 200 and the processing device 300 process the tail gas, improving the operation reliability and stability of the subsequent combustion device 200 and the processing device 300. At the same time, through the combustion device 200 and the processing device 300 sequentially performing combustion and secondary purification treatment on the pre-dusted tail gas, the tail gas discharged at the end of the system meets the emission standards, reducing environmental pollution.

[0060] In some embodiments of the present application, referring to Figure 1 , the dust removal device 100 includes a first dust collector 110 and a second dust collector 120. The tail gas outlet of the graphitization furnace 500, the first dust collector 110, the second dust collector 120, and the combustion device 200 are sequentially connected. The first dust collector 110 is used to remove the first particulate matter in the first tail gas, and the second dust collector 120 is used to remove the second particulate matter in the first tail gas. The diameter of the first particulate matter is larger than that of the second particulate matter.

[0061] Specifically, the first particulate matter and the second particulate matter respectively refer to the coarse particulate matter (including dust) and fine particulate matter in the first tail gas. For example, the first particulate matter is particulate matter with a diameter greater than or equal to 5 μm in the first tail gas, and the second particulate matter is particulate matter with a diameter less than 5 μm in the first tail gas.

[0062] The first dust collector 110 is a cyclone dust collector, which separates the first particulate matter in the first tail gas through centrifugal force and can efficiently remove the coarse particulate matter in the first tail gas; the second dust collector 120 is a mechanical dry filter, which separates the second particulate matter in the first tail gas through multiple gradually distributed filter layers and can efficiently remove the fine particulate matter in the first tail gas. Of course, the first dust collector 110 and the second dust collector 120 can also be a wet dust collector and a bag filter respectively.

[0063] It can be understood that by sequentially removing the coarse particulate matter and the fine particulate matter in the first tail gas through the first dust collector 110 and the second dust collector 120, the dust removal efficiency of the first tail gas is improved, the dust concentration in the first tail gas is reduced, and the risk of dust explosion in the subsequent combustion device 200 and the processing device 300 is further reduced.

[0064] Furthermore, a first pressure relief mechanism 111 is provided on the first dust collector 110, and the first pressure relief mechanism 111 is used to relieve the pressure of the internal cavity of the first dust collector 110.

[0065] When the first dust collector 110 is a cyclone dust collector, after the first tail gas enters the first dust collector 110, due to the rotational movement of the first dust collector 110 and the friction between the air flow and the inner wall surface of the first dust collector 110, and as the dust particulate matter in the first tail gas accumulates on the inner wall surface of the first dust collector 110, the internal pressure of the first dust collector 110 will rise.

[0066] Based on this, by providing the first pressure relief mechanism 111 on the first dust collector 110, when the pressure of the internal cavity of the first dust collector 110 is too high, the pressure can be relieved in time through the first pressure relief mechanism 111, and the operation stability and reliability of the first dust collector 110 are improved.

[0067] Specifically, the first pressure relief mechanism 111 can be a pressure relief valve, a spring-type safety valve, etc. The first pressure relief mechanism 111 directly senses the pressure of the internal cavity of the first dust collector 110 and automatically opens when the sensed pressure is greater than the preset pressure to achieve pressure relief.

[0068] In some embodiments of the present application, referring again to Figure 1 , the inlet of the dust removal device 100 is communicated with the tail gas outlet of the graphitization furnace 500 through the first pipeline 10, and a first flame arrester 11 and a first check valve 12 are provided on the first pipeline 10.

[0069] In the first pipeline 10, the first flame arrester 11 can be arranged upstream or downstream of the first check valve 12, and the first flame arrester 11 and the first check valve 12 are arranged at intervals. The first flame arrester 11 can be a wire mesh flame arrester, a corrugated plate flame arrester, etc., and the first check valve 12 can be a ball check valve, a spring check valve, etc.

[0070] It is easy to understand that the first flame arrester 11 can prevent the flame in the first pipeline 10 from spreading into the graphitization furnace 500, improving the reliability and stability of the system. The first check valve 12 can prevent the first tail gas in the first pipeline 10 from flowing back into the graphitization furnace 500, improving the operating reliability and stability of the tail gas treatment system.

[0071] Furthermore, referring to Figure 1 and Figure 2 , oxygen detectors 13, first switching valves 14, and nitrogen delivery mechanisms 15 are also provided at intervals on the first pipeline 10. The oxygen detectors 13 are used to detect the oxygen concentration in the first pipeline 10. The first switching valves 14 are used to block or conduct the first pipeline 10. The nitrogen delivery mechanisms 15 are used to deliver nitrogen to the first pipeline 10. In addition, a first relief pipe 510 is connected to the furnace body of the graphitization furnace 500, and a first relief valve 520 is provided on the first relief pipe 510. The outlet of the combustion device 200 is connected to the processing device 300 through a third pipeline 30. A second switching valve 34 is provided on the main path of the third pipeline 30. A second relief pipe 32 is connected to the branch path of the third pipeline 30, and a second relief valve 33 is provided on the second relief pipe 32. The first switching valves 14, the second switching valves 34, the first relief valves 520, and the second relief valves 33 are all electric valves.

[0072] The above-mentioned oxygen detectors 13, first switching valves 14, second switching valves 34, nitrogen delivery mechanisms 15, first relief valves 520, and second relief valves 33 are all in telecommunication connection with the controller of the system.

[0073] When the oxygen detectors 13 detect that the oxygen concentration in the first pipeline 10 is too high or the pressure in the furnace body of the graphitization furnace 500 is too high, or when the tail gas treatment system operates abnormally as a whole, the controller controls the first switching valves 14 to close and stops the operation of the graphitization furnace 500, thereby cutting off the delivery of the first tail gas in the connecting pipeline of the graphitization furnace 500 to the tail gas treatment system, and controls the second switching valves 34 to close, cutting off the tail gas delivery to the backend processing device 300.

[0074] At the same time, the controller also controls the first relief valves 520 to open and the second relief valves 33 to open, thereby conducting the first relief pipe 510 and the second relief pipe 32. In this way, the tail gas of the graphitization furnace 500 and the tail gas in the pipeline of the tail gas treatment system can be quickly discharged to the designated area through the first relief pipe 510 and the second relief pipe 32 respectively, improving the operating stability and reliability of the graphitization furnace 500 and the tail gas treatment system.

[0075] In addition, the controller also controls the nitrogen delivery mechanism 15 to deliver nitrogen to the first pipeline 10, so that the nitrogen enters the first pipeline 10 for purging, and more thoroughly guides out the combustible gas in the first pipeline 10 and its downstream pipelines. In addition, when the exhaust gas treatment system needs to be repaired and maintained, nitrogen can also be delivered to the first pipeline 10 through the nitrogen delivery mechanism 15 to discharge the exhaust gas in the first pipeline 10 and its downstream pipelines in advance, thereby reducing the concentration of harmful gases in the pipelines configured on the exhaust gas treatment system.

[0076] It is easy to understand that when the exhaust gas treatment system operates normally, the first switch valve 14 and the second switch valve 34 are both in an open state, and the first relief valve 520 and the second relief valve 33 are both in a closed state, so that the exhaust gas flows smoothly and orderly along the pipeline of the exhaust gas treatment system.

[0077] In some embodiments of the present application, see Figure 2 The exhaust gas treatment system also includes a regulating device 400, which is connected between the dust removal device 100 and the combustion device 200. The regulating device 400 is used to introduce the second exhaust gas discharged by the dust removal device 100 and introduce fresh air into the second exhaust gas to adjust the concentration of the second exhaust gas.

[0078] Specifically, the regulating device 400 can be a matching structure of an air mixing box and a blower. It should be noted that fresh air refers to fresh air that has been filtered and purified multiple times, and the fresh air contains gases such as oxygen and nitrogen. The concentration of the second exhaust gas refers to the mass number or volume ratio of the second exhaust gas contained in each cubic meter of air. Similarly, the combustible gas concentration in the second exhaust gas refers to the mass number or volume ratio of the combustible gas contained in each cubic meter of air, and the dust concentration in the second exhaust gas refers to the mass number or volume ratio of the dust contained in each cubic meter of air. After the fresh air is mixed with the second exhaust gas, the second exhaust gas is diluted, the concentration of the second exhaust gas is reduced, and the combustible gas concentration and dust concentration in the second exhaust gas are also reduced.

[0079] It should be understood that after the regulating device 400 introduces the second exhaust gas discharged by the dust removal device 100, it also introduces fresh air into the second exhaust gas, and the fresh air is mixed with the second exhaust gas to adjust the concentration of the second exhaust gas, thereby reducing the combustible gas concentration and dust concentration in the second exhaust gas to below the explosion limit, further reducing the risk of explosion of the rear-end combustion device 200 and the processing equipment 300.

[0080] Further, see Figure 2 The regulating device 400 includes a mixed air regulator 410 and an air supply device 420. The mixed air regulator 410 is used to introduce the second exhaust gas, and the air supply device 420 is used to transport fresh air to the mixed air regulator 410 to mix the second exhaust gas with the fresh air.

[0081] Specifically, the inlet and outlet of the air mixing regulator 410 are correspondingly connected to the outlet of the dust removal device 100 and the inlet of the combustion device 200 respectively. An air mixing cavity is formed in the air mixing regulator 410, and the air blower 420 is connected to the air mixing cavity of the air mixing regulator 410. The air blower 420 can be a blower or the like, and the delivery volume of fresh air can be adjusted by adjusting the operating frequency of the air blower 420.

[0082] It can be understood that the air mixing regulator 410 introduces the second tail gas discharged from the dust removal device 100 into the air mixing cavity. At the same time, the air blower 420 delivers fresh air to the air mixing cavity, so that the second tail gas is mixed with the fresh air, thereby adjusting the concentration of the second tail gas, and further reducing the concentration of combustible gas and dust in the second tail gas to below the explosion limit value, further reducing the risk of explosion of the subsequent combustion device 200 and the treatment device 300.

[0083] Further, referring to Figure 2 , there are at least two air blowers 420, and at least part of the air blowers 420 are connected in parallel.

[0084] Specifically, there are two air blowers 420, and the two air blowers 420 are respectively connected to the air mixing cavity of the air mixing regulator 410 through two fourth pipelines 40. The two fourth pipelines 40 are arranged in parallel, and a third switching valve 41 is provided on each fourth pipeline 40. The third switching valve 41 is used to block or conduct the corresponding fourth pipeline 40.

[0085] It should be noted that by setting at least two air blowers 420 connected in parallel, at least one air blower 420 can be selectively enabled and at least one air blower 420 can be reserved as a backup. When the enabled air blower 420 fails, the backup air blower 420 can be enabled. In this way, when the air blower 420 fails, the probability of explosion due to excessive concentration of combustible gas in the air mixing regulator 410 and its subsequent equipment is reduced.

[0086] Further, referring to Figure 2 , the outlet of the air mixing regulator 410 is connected to the combustion device 200 through the second pipeline 20. A temperature detector 21 and / or a combustible gas detector 22 are provided on the second pipeline 20. The temperature detector 21 is used to detect the temperature in the second pipeline 20, and the combustible gas detector 22 is used to detect the concentration of combustible gas in the second pipeline 20.

[0087] Specifically, the controller of the tail gas treatment system is in telecommunication connection with the temperature detector 21, the combustible gas detector 22 and the air blower 420. The temperature detector 21 and the combustible gas detector 22 can be set on the second pipeline 20 at the same time, or one of them can be set.

[0088] When the temperature detector 21 detects that the temperature of the second tail gas in the second pipeline 20 is greater than the preset temperature, it indicates that the temperature in the second pipeline 20 is relatively high. At this time, the controller controls the air blower 420 to increase the operating frequency, increase the fresh air volume delivered by the air blower 420 to the air mixing regulator 410, reduce the temperature of the second pipeline 20, and improve the system stability. The preset temperature can be set according to the scale of the actual tail gas treatment system.

[0089] When the combustible gas detector 22 detects that the concentration of the combustible gas in the second pipeline 20 is greater than the preset concentration, it indicates that there is a relatively high explosion risk in the second pipeline 20 and its subsequent equipment. At this time, the controller also controls the air blower 420 to increase the operating frequency, increase the fresh air volume delivered by the air blower 420 to the air mixing regulator 410, so that the concentration of the combustible gas and the dust concentration in the second tail gas are reduced below the explosion limit, further reducing the risk of explosion of the subsequent combustion device 200 and the treatment equipment 300, and improving the system stability. Similarly, the preset concentration of the combustible gas can be set according to the scale of the actual tail gas treatment system.

[0090] Further, referring to Figure 2 , a second flame arrester 23 is provided at a position of the second pipeline 20 close to the combustion device 200. The second flame arrester 23 can be a wire mesh flame arrester, a corrugated plate flame arrester, etc. The second flame arrester 23 can prevent the flame in the combustion device 200 from spreading into the front-end tail gas pipeline, reduce the risk of fire in the pipeline and equipment at the front end of the combustion device 200, and improve the system stability.

[0091] In some embodiments of the present application, referring to Figure 2 and Figure 3 , the treatment equipment 300 includes a desulfurization device 310. The desulfurization device 310 is communicated with the outlet of the combustion device 200, and the desulfurization device 310 is used to remove the air pollutants in the third tail gas.

[0092] In the present application, the desulfurization device 310 refers to a device that can perform desulfurization and desulfurization on the third tail gas discharged from the combustion device 200, remove gaseous pollutants such as nitrogen oxides, sulfur dioxide, and sulfur trioxide in the third tail gas, realize the filtration and purification of the third tail gas, and make the flue gas discharged at the end meet the emission standards. Specifically, the desulfurization device 310 can be, but is not limited to, a wet desulfurization tower or a desulfurization spray tower.

[0093] Exemplarily, the desulfurization device 310 is a desulfurization spray tower. The desulfurization spray tower is sequentially and spacedly provided with a water tank 311, a cyclone layer 312, a packing layer 313 (such as a Pall packing layer), a spray layer 314, a demisting layer 315, and a chimney 316 from the bottom to the top of the tower. A water pump 317 for conveying the alkaline liquid in the water tank 311 to the spray layer 314 is also provided on the desulfurization spray tower. The third tail gas discharged from the combustion device 200 enters from the area between the water tank 311 and the cyclone layer 312 of the desulfurization spray tower. After the air flow distribution is changed by the cyclone layer 312, it then passes upward through the packing layer 313 and the spray layer 314 in sequence. The water pump 317 pumps the alkaline liquid in the water tank 311 to the spray layer 314, and the nozzles on the spray layer 314 spray the alkaline liquid downward. The alkaline liquid reacts with acidic gases such as sulfur dioxide and nitrogen oxides in the third tail gas in the spray layer 314 and the packing layer 313 to generate substances such as sulfates and nitrates, thereby desulfurizing and denitrifying the third tail gas. The third tail gas after the desulfurization and denitrification reaction passes through the demisting layer 315, and the wire demister on the demisting layer 315 removes the carried water mist and fine particles, and finally is discharged through the chimney 316 to meet the emission standards and reduce environmental pollution.

[0094] Further, referring to Figure 3 again, an air quality detector for the tail gas components (not shown in the figure) can be provided in the chimney 316. The air quality detector can detect the concentration of each component in the tail gas in the chimney 316, such as the concentration of organic waste gas, the concentration of gaseous pollutants and other pollutant concentrations. When it is detected that the tail gas in the chimney 316 does not meet the emission standards, the tail gas is re-introduced into the desulfurization device 310 for secondary filtration until it meets the emission standards.

[0095] Further, referring to Figure 2 and Figure 3 again, the outlet of the combustion device 200 is communicated with the desulfurization device 310 through a third pipeline 30, and an air extractor 31 is provided on the third pipeline 30.

[0096] Specifically, the air extractor 31 can be a centrifugal air extractor or an axial flow air extractor.

[0097] It is easy to understand that the third tail gas discharged from the combustion device 200 is introduced into the desulfurization device 310 through the air extractor 31 for desulfurization and denitrification treatment, improving the purification efficiency of the third tail gas.

[0098] Further, there are at least two third pipelines 30, and all the third pipelines 30 are connected in parallel.

[0099] Specifically, two air extractors 31 are respectively communicated with the inlet of the desulfurization device 310 through two third pipelines 30. The two third pipelines 30 are arranged in parallel, and a fourth shut-off valve 35 is provided on each third pipeline 30. The fourth shut-off valve 35 is used to block or conduct the corresponding third pipeline 30.

[0100] It should be noted that by setting at least two parallel-connected air extractors 31, at least one air extractor 31 can be selectively enabled and at least one air extractor 31 can be reserved as a backup. When the enabled air extractor 31 fails, the backup air extractor 31 can be enabled. In this way, the tail gas can flow orderly and smoothly along the pipeline of the tail gas treatment system, improving the operation stability of the system.

[0101] Furthermore, a flow detector 16 is provided on the first pipeline 10, and the flow detector 16 is used to detect the flow rate of the first tail gas in the first pipeline 10.

[0102] Both the air extractor 31 and the flow detector 16 are in telecommunication connection with the controller of the tail gas treatment system. When the flow detector 16 detects that the flow rate of the first tail gas in the first pipeline 10 is large, the controller correspondingly controls the air extractor 31 to increase the operating frequency, thereby accelerating the tail gas treatment efficiency.

[0103] In some embodiments of the present application, the processing device 300 further includes a filtering device (not shown in the figure) connected between the combustion device 200 and the desulfurization device 310, and a waste heat recovery device (not shown in the figure) connected between the combustion device 200 and the filtering device.

[0104] That is to say, after the combustion device 200 discharges the third tail gas, the third tail gas flows into the waste heat recovery device, the filtering device, and the desulfurization device 310 in sequence.

[0105] It should be noted that the waste heat recovery device is used to recover the heat of the third tail gas. The waste heat recovery device can be a waste heat hot water boiler assembly. After the third tail gas enters the waste heat hot water boiler assembly, the heat of the third tail gas exchanges heat with the water flowing in the heat exchange pipeline of the waste heat hot water boiler assembly, heating the water to a certain temperature. The generated hot water or steam can be used in other processes, such as for domestic heating, power generation, etc. In this way, the direct dissipation of heat is reduced, the energy utilization rate is improved, and energy waste is reduced.

[0106] The filtering device is used to perform secondary dust removal on the tail gas discharged from the waste heat recovery device. The filtering device can be a bag filter to further remove the fine particles remaining in the third tail gas.

[0107] Through the coordinated setting of the waste heat recovery device, the filtering device, and the desulfurization device 310, on the one hand, a large amount of heat in the tail gas discharged from the graphitization furnace 500 is effectively recovered, the energy utilization rate is improved, and energy waste is reduced. Moreover, the tail gas discharged from the graphitization furnace 500 is converted into clean and green flue gas meeting the emission standards, reducing environmental pollution.

[0108] In addition, based on the same concept as the above exhaust gas treatment system, an embodiment of the present application further provides a graphitization furnace, which includes the exhaust gas treatment system of any of the above embodiments.

[0109] Specifically, the graphitization furnace includes a graphitization furnace 500, which is used to graphitize carbonaceous materials.

[0110] It can be understood that during the process of graphitization of carbonaceous materials through high-temperature reaction in the reaction chamber of the graphitization furnace 500, initial first exhaust gas is generated. The first exhaust gas is discharged from the exhaust gas outlet of the graphitization furnace 500 and flows through the dust removal device 100, the combustion device 200, and the treatment device 300 in sequence. The dust removal device 100 pre-dusts the first exhaust gas discharged from the graphitization furnace 500 to reduce the dust concentration in the first exhaust gas, so that the dust concentration in the exhaust gas entering the subsequent combustion device 200 and treatment device 300 is relatively low, thereby reducing the risk of dust explosion when the combustion device 200 and the treatment device 300 treat the exhaust gas, improving the operation reliability and stability of the subsequent combustion device 200 and treatment device 300. At the same time, through the combustion device 200 and the treatment device 300, the exhaust gas after pre-dust removal is combusted and secondary purified in sequence, so that the exhaust gas discharged at the end of the system meets the emission standards and reduces environmental pollution.

[0111] See Figures 1 to 3 , an embodiment of the present application provides an exhaust gas treatment system and a graphitization furnace. The exhaust gas treatment system is used to treat the first exhaust gas discharged from the graphitization furnace 500. The exhaust gas treatment system includes: a dust removal device 100, which is connected to the exhaust gas outlet of the graphitization furnace 500 and is used to remove dust from the first exhaust gas; a combustion device 200, which is connected to the outlet of the dust removal device 100 and is used to combust and oxidize the second exhaust gas discharged from the dust removal device 100; a treatment device 300, which is connected to the outlet of the combustion device 200 and is used to purify the third exhaust gas discharged from the combustion device 200. The graphitization furnace includes the above exhaust gas treatment system.

[0112] In the exhaust gas treatment system and the graphitization furnace according to the embodiments of the present application, through the sequential cooperative arrangement of the dust removal device 100, the combustion device 200, and the treatment device 300, the dust removal device 100 pre-dusts the first exhaust gas discharged from the graphitization furnace 500 to reduce the dust concentration in the first exhaust gas, so that the dust concentration in the exhaust gas entering the subsequent combustion device 200 and treatment device 300 is relatively low, thereby reducing the risk of dust explosion when the combustion device 200 and the treatment device 300 treat the exhaust gas, and improving the operation reliability and stability of the subsequent combustion device 200 and treatment device 300. At the same time, through the combustion device 200 and the treatment device 300 sequentially burning and performing secondary purification treatment on the exhaust gas after pre-dust removal, the exhaust gas discharged at the end of the system meets the emission standards, reducing environmental pollution.

[0113] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered to be within the scope described in this specification.

[0114] The above-described embodiments only represent several implementation manners of the present application, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the patent application. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several deformations and improvements can still be made, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application should be subject to the appended claims.

Claims

1. A tail gas treatment system for treating the first tail gas discharged from a graphitization furnace, characterized in that: include: a dust removal device, connected to the tail gas outlet of the graphitization furnace, and used for removing dust from the first tail gas; A combustion device, connected to the outlet of the dust removal device, for burning and oxidizing the second tail gas discharged from the dust removal device; A regulating device, the regulating device is connected between the dust removal device and the combustion device, and the regulating device is used to introduce the second exhaust gas discharged by the dust removal device and introduce fresh air into the second exhaust gas to adjust the concentration of the second exhaust gas; The processing equipment is connected to the outlet of the combustion device and is used for purifying the third tail gas discharged from the combustion device.

2. The exhaust gas treatment system according to claim 1, characterized in that: The dust removal device includes a first dust collector and a second dust collector. The exhaust gas outlet of the graphitization furnace, the first dust collector, the second dust collector and the combustion device are connected in sequence. The first dust collector is used to remove first particulate matter in the first exhaust gas, and the second dust collector is used to remove second particulate matter in the first exhaust gas. The diameter of the first particulate matter is greater than the diameter of the second particulate matter.

3. The exhaust gas treatment system according to claim 1, characterized in that: The inlet of the dust removal device is connected to the tail gas outlet of the graphitization furnace through a first pipeline, and the first pipeline is provided with a first flame arrester and a first check valve.

4. The exhaust gas treatment system according to claim 1, characterized in that: The regulating device includes an air mixing regulator and an air supply device. The air mixing regulator is used to introduce the second exhaust gas, and the air supply device is used to supply fresh air to the air mixing regulator so that the second exhaust gas is mixed with the fresh air.

5. The exhaust gas treatment system according to claim 4, characterized in that: The air blowers include at least two, and at least some of the air blowers are connected in parallel.

6. The exhaust gas treatment system according to claim 4, characterized in that: The outlet of the air mixing regulator is connected to the combustion device through a second pipe. The second pipe is provided with a temperature detector and / or a combustible gas detector. The temperature detector is used to detect the temperature in the second pipe, and the combustible gas detector is used to detect the concentration of the combustible gas in the second pipe.

7. The exhaust gas treatment system according to any one of claims 1 to 6, characterized in that: The processing equipment comprises a desulfurization device, which is connected to the outlet of the combustion device and is used to remove atmospheric pollutants in the third tail gas.

8. The exhaust gas treatment system according to claim 7, characterized in that: The outlet of the combustion device is connected to the desulfurization device through a third pipeline, and a draft device is provided on the third pipeline.

9. The exhaust gas treatment system according to claim 8, characterized in that: There are at least two third pipelines, and all of the third pipelines are connected in parallel.

10. A graphitization furnace, characterized in that: The exhaust gas treatment system comprises the exhaust gas treatment system as claimed in any one of claims 1 to 9.

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