Flue gas collection system and method for graphitization furnace group

Abstract

This application relates to the field of graphite purification, specifically disclosing a flue gas collection system for a graphitization furnace group, integrated into several graphitization furnaces to collect flue gas; wherein the several graphitization furnaces are arranged in a line; including: a furnace cover, set on the graphitization furnace to cover the furnace opening; a movable flue pipe, connected to the furnace cover; a fixed flue pipe assembly, connected to the movable flue pipe; and a filter module, set inside the movable flue pipe; wherein, two sets of both the furnace cover and the movable flue pipe are provided; the movable flue pipe is detachably placed on a platform between adjacent graphitization furnaces, one end of the movable flue pipe is used to connect to the furnace cover set on the furnace opening of the graphitization furnace, and the other end is connected to the fixed flue pipe through a connector; by controlling the opening and closing of each gate valve, any movable flue pipe can selectively connect to the fixed flue pipe located above or below; the beneficial effect of this application is that it provides a flue gas collection system for a graphitization furnace group that can improve collection efficiency.

Description

Technical Field

[0001] This application relates to the field of graphite purification, and in particular to a flue gas collection system for graphitization furnaces. Background Technology

[0002] The graphitization furnace is the core equipment for the high-temperature purification of natural flake graphite. It purifies graphite by heating it to about 3000℃ through electricity.

[0003] During the graphitization process, a large amount of dust-laden flue gas and volatiles at 80°C to 100°C are generated inside the furnace. If they cannot be effectively collected and treated, they will not only cause pollution to the workshop environment, but also lead to problems such as oxidation of auxiliary materials and high cost of exhaust gas treatment.

[0004] However, in the process of implementing the above technical solution, the inventors of this application discovered that the above technology has at least the following technical problems:

[0005] In actual production, multiple graphitization furnaces typically share a single external flue system. When one furnace stops receiving power and another starts receiving power, the flue gas collection pipes of the two furnaces may be connected simultaneously, causing high-temperature flue gas to flow between different furnaces. This not only interferes with normal production processes but also increases the burden of flue gas treatment.

[0006] After the graphitization furnace is powered on, the temperature inside the furnace remains high, and dust continues to overflow. Current technology typically removes the gas collection device immediately after power is supplied, neglecting the need for flue gas collection after furnace shutdown, resulting in a large amount of fugitive emissions of flue gas.

[0007] Therefore, it is necessary to design a flue gas collection system for graphitization furnace groups to improve flue gas collection efficiency. Summary of the Invention

[0008] This application provides a flue gas collection system for a graphitization furnace group, which solves the problem of low flue gas collection efficiency in the prior art when multiple graphitization furnaces are operating simultaneously, and achieves improved flue gas collection efficiency.

[0009] The flue gas collection system for the graphitization furnace group provided in this application is integrated into several graphitization furnaces to collect the flue gas; wherein the several graphitization furnaces are arranged in a line; including:

[0010] A furnace lid is installed on the graphitization furnace to cover the furnace opening;

[0011] The movable flue pipe connects to the furnace cover;

[0012] A fixed flue assembly is connected to a mobile flue.

[0013] The filter module is installed inside the movable flue.

[0014] The furnace cover and the movable smoke pipe are each provided in two sets. The movable smoke pipe can be detachably placed on a platform between adjacent graphitization furnaces. One end of the movable smoke pipe is used to connect to the furnace cover on the furnace opening of the graphitization furnace, and the other end is connected to the fixed smoke pipe through a connector. The fixed smoke pipe includes a first smoke pipe and a second smoke pipe located on the side of the first smoke pipe. The first smoke pipe and the second smoke pipe are independently connected to exhaust fans. By controlling the opening and closing of each gate valve, any movable smoke pipe can selectively connect to the fixed smoke pipe located above or below. The filter module filters impurities in the flue gas along the flue gas flow direction.

[0015] The installation of furnace covers and movable flue pipes enables the alternating collection of flue gas when multiple adjacent graphitization furnaces are in operation; at the same time, the coordinated operation of movable and fixed flue pipe groups ensures efficient flue gas collection.

[0016] Optionally, the opening and closing methods of the slide gate valve include:

[0017] S1. During the power supply of the first graphitization furnace, the movable smoke pipe corresponding to the furnace cover on the first graphitization furnace is connected to the fixed smoke pipe located below through the connector, and the corresponding gate valve is opened to extract air.

[0018] S2. During the period when the first graphitization furnace is powered off but flue gas is still overflowing, keep the movable flue pipe corresponding to the first graphitization furnace connected to the first flue pipe; at the same time, during the period when the second graphitization furnace is powered on, connect the movable flue pipe corresponding to the furnace cover on the second graphitization furnace to the second flue pipe through the connector, and open the corresponding gate valve to extract gas.

[0019] Optionally, after the first graphitization furnace stops escaping flue gas, the slide valve connected to the movable flue pipe corresponding to the first graphitization furnace is closed, the movable flue pipe corresponding to the first graphitization furnace is transferred to the platform between the third and fourth graphitization furnaces, and the furnace cover on the first graphitization furnace is transferred and placed on the third graphitization furnace.

[0020] Optionally, the filter module includes:

[0021] Connecting pipe, used to connect movable flue pipes and fixed flue pipe assemblies;

[0022] The filter screen is installed inside the connecting pipe;

[0023] Temperature regulation component, used to regulate the temperature of flue gas flowing through the moving flue;

[0024] The nozzle is positioned between the filter and the movable flue.

[0025] The movable flue section is placed inside the connecting pipe along the direction of flue gas flow; the outer wall of the movable flue section inside the connecting pipe and the inner wall of the connecting pipe form a cooling zone for mounting the temperature regulation component; the nozzle is connected to the cooling zone.

[0026] Optionally, the movable flue pipe forms a flared section along the flue gas flow direction to connect with the filter screen;

[0027] Several nozzles are provided and distributed in a circular array along the circumference of the flared section on the inner wall of the flared section;

[0028] The projections of two adjacent nozzles along the circumference on the same plane are 3 cm apart.

[0029] Optionally, the nozzle forms a guide path for mixing the guide gas with the flue gas;

[0030] The guide path and the axis formed by the connecting pipe form an angle on the same surface;

[0031] Among them, the included angles formed by two adjacent nozzles along the clockwise and / or counterclockwise circumferential directions differ by 20°-30°.

[0032] Optionally, one end of the filter screen is connected to the flared part, and the other end is fixedly connected to the inner wall of the connecting pipe;

[0033] The diameter of the port at the connection point between the filter screen and the flared part is larger than the diameter of the port further away from the flared part.

[0034] Optional, the temperature regulation components include:

[0035] Coil, surrounding the outer wall of the movable flue located in the cooling zone;

[0036] A refrigeration unit, connected to coils, to achieve heat exchange;

[0037] The fan is mounted on the connecting pipe;

[0038] Temperature sensor used to detect the temperature of the cooling zone;

[0039] The temperature sensor converts the detected temperature of the cooling zone into a detection signal and transmits it to the central processing system. The central processing system receives the detection signal and selects an operating mode based on the detection signal, or converts the detection signal into a corresponding input command based on the current operating mode. The output commands include: preset target temperature, data viewing, data storage, locking or blocking the detection signal.

[0040] Optionally, an opening for mounting a fan can be made at the location of the connecting pipe in the cooling zone.

[0041] In summary, this application includes at least one of the following beneficial technical effects:

[0042] 1. In response to the shortcomings of existing multi-furnace shared flue systems, which are prone to flue gas crossflow and unorganized emissions after furnace shutdown, this solution adopts a dual independent fixed flue system with a first and second flue arranged vertically (each equipped with an independent exhaust fan), and two sets of movable flue pipes and furnace covers. Through time-sharing control of the slide gate valve, the high-temperature flue gas during the power supply period and the residual flue gas after furnace shutdown can be introduced into different independent flue systems, which completely avoids the crossflow interference of flue gas in different production stages in the pipeline, eliminates the negative impact on the production process, and reduces the load fluctuation of the downstream flue gas treatment system.

[0043] 2. To address the issues of difficulty in intercepting volatiles in high-temperature flue gas and the low filtration efficiency and easy wear of ordinary filters, this solution involves setting up a ring array of nozzles with adjacent guide angles differing by 20°~30° on the inner wall of the flared section of the moving flue. This, combined with the low-temperature gas and condensed water vapor output from the cooling zone, forms a spiraling turbulent flow field. On the one hand, this allows the cooling medium to fully mix and exchange heat with the high-temperature flue gas, rapidly reducing the flue gas temperature and causing the gaseous volatiles in the flue gas to condense into filterable particulate matter. On the other hand, the swirling flow field causes water vapor and dust particles to collide and coalesce, achieving pre-dust removal efficiency enhancement at the front end of the filter. Attached Figure Description

[0044] Figure 1 This is a schematic diagram of the overall structure of an embodiment of this application;

[0045] Figure 2 This is a schematic diagram of the overall structure of the connecting pipe and the movable flue pipe according to an embodiment of this application;

[0046] Figure 3 This is a schematic diagram of the overall internal structure of the connecting pipe and the movable smoke pipe according to an embodiment of this application;

[0047] Figure 4 This is a schematic diagram of the flow guiding path formed by the nozzle in an embodiment of this application;

[0048] Figure 5 This is a schematic diagram of the flow path and the first direction according to an embodiment of this application.

[0049] Figure label:

[0050] 100. Graphitization furnace;

[0051] 10. Furnace lid;

[0052] 20. Moving flue; 21. Outlet pipe;

[0053] 30. Fixed smoke pipe assembly; 31. First smoke pipe; 32. Second smoke pipe;

[0054] 40. Filter module; 41. Connecting pipe; 42. Filter screen; 43. Nozzle; L, first direction; 44. Flared part; 45. Cooling zone; 46. Coil; 47. Fan; 48. Opening;

[0055] 50. Slide valve;

[0056] 60. Platform. Detailed Implementation

[0057] Embodiments of this disclosure will now be described in more detail with reference to the accompanying drawings. While some embodiments of this disclosure are shown in the drawings, it should be understood that this disclosure can be implemented in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of this disclosure. It should be understood that the accompanying drawings and embodiments of this disclosure are for illustrative purposes only and are not intended to limit the scope of protection of this disclosure.

[0058] It should also be noted that, for ease of description, only the parts relevant to the invention are shown in the accompanying drawings. Unless otherwise specified, the embodiments and features described in this disclosure can be combined with each other.

[0059] It should be noted that the concepts of "first" and "second" mentioned in this disclosure are used only to distinguish different devices, modules or units, and are not used to limit the order of functions performed by these devices, modules or units or their interdependencies.

[0060] It should be noted that the terms "a" and "a plurality of" used in this disclosure are illustrative rather than restrictive, and those skilled in the art should understand that, unless otherwise expressly indicated in the context, they should be understood as "one or more".

[0061] This disclosure will now be described in detail with reference to the accompanying drawings and embodiments.

[0062] This application discloses a flue gas collection system for a graphitization furnace group.

[0063] Example 1

[0064] The flue gas collection system of the graphitization furnace group is integrated into several graphitization furnaces 100 to achieve centralized collection of flue gas. The several graphitization furnaces 100 are arranged in a straight line in the horizontal direction. In this embodiment, eight graphitization furnaces 100 (furnaces 1 to 8) are used as an example for description, but the scope of protection of the present invention is not limited to this. Those skilled in the art can reasonably set the number of graphitization furnaces 100 according to actual production needs. The flue gas collection system of the graphitization furnace group 100 includes: furnace cover 10, movable flue 20, fixed flue 30, filter module 40 and slide valve 50.

[0065] Specifically, two sets of furnace covers 10 and movable smoke pipes 20 are provided, and the two sets of furnace covers 10 and movable smoke pipes 20 can be used alternately to adapt to the working conditions of multiple graphitization furnaces 100 at different production stages. The furnace cover 10 is placed above the furnace opening of the graphitization furnace 100 to seal the furnace opening and collect the flue gas generated inside the furnace. Each set of furnace covers 10 is provided with a flue gas outlet pipe 21. One end of the flue gas outlet pipe 21 is connected to the internal space of the furnace cover 10, and the other end is detachably connected to one end of the movable smoke pipe 20. In this way, the flue gas inside the graphitization furnace 100 enters the movable smoke pipe 20 through the outlet pipe 21 and is discharged.

[0066] The eight graphitization furnaces 100 are arranged in a straight line as furnace No. 1, furnace No. 2, furnace No. 3, furnace No. 4, furnace No. 5, furnace No. 6, furnace No. 7, and furnace No. 8. A platform 60 is provided on the ground between adjacent graphitization furnaces 100, and the movable flue 20 can be detachably placed on the platform 60 to facilitate transfer between different furnace positions.

[0067] More specifically, one end of the movable flue pipe 20 is detachably connected to the flue gas outlet pipe 21 of the furnace cover 10 via a connector; preferably, the connector is a flange connection structure, including a first flange disposed at the end of the flue gas outlet pipe 21 and a second flange disposed at the end of one end of the movable flue pipe 20. The first flange and the second flange are detachably fixedly connected by bolts, and a high-temperature resistant sealing gasket (not shown in the figure) is disposed between the two flanges to ensure the airtightness of the connection; this connector is a commonly used connection component on the market, and this application only uses the flange as an example; the improvement of this application is not in the connection method, so the connector will not be described in detail.

[0068] The other end of the mobile flue 20 is detachably connected to the fixed flue assembly 30 via a connector, which is a clamp connection, to facilitate the disassembly of the mobile flue 20. The bottom of the mobile flue 20 is equipped with wheels to facilitate the operator to push the mobile flue 20 between different furnace positions on the platform 60.

[0069] Specifically, the fixed smoke pipe assembly 30 is fixedly installed on one side of the graphitization furnace assembly (for example, on the side ground along the arrangement direction of the graphitization furnace 100), including a first smoke pipe 31 and a second smoke pipe 32. The second smoke pipe 32 is located above the side of the first smoke pipe 31 (i.e., the fixed smoke pipe located above).

[0070] Both the first smoke pipe 31 and the second smoke pipe 32 are fixed pipes extending along the arrangement direction of the graphitization furnaces 100, and their extension direction is parallel to the linear arrangement direction of the multiple graphitization furnaces 100; the first smoke pipe 31 is provided with multiple first air inlet branch pipes at intervals, and the position of each first air inlet branch pipe corresponds to the furnace position of the corresponding graphitization furnace 100 (for example, the first air inlet branch pipe corresponds to furnace No. 1, the second air inlet branch pipe corresponds to furnace No. 2, and so on); the second smoke pipe 32 is also provided with multiple second air inlet branch pipes at intervals.

[0071] A first exhaust fan is connected to the end of the first smoke pipe 31, and a second exhaust fan is connected to the end of the second smoke pipe 32. The first and second exhaust fans operate independently to provide suction power for the first smoke pipe 31 and the second smoke pipe 32. Preferably, both the first and second exhaust fans are variable frequency fans, which can adjust the suction power according to the actual smoke volume.

[0072] Each intake branch pipe is equipped with a first gate valve 50, and each second intake branch pipe is equipped with a second gate valve 50. The gate valve 50 is used to control the opening and closing of the corresponding intake branch pipe; specifically, the first intake branch pipe is equipped with a first gate valve 50 to control the connection between the first flue pipe 31 and the movable flue pipe 20 at the corresponding furnace position; the second intake branch pipe is equipped with a second gate valve 50 to control the connection between the second flue pipe 32 and the movable flue pipe 20 at the corresponding furnace position.

[0073] More specifically, the slide gate valve 50 can be an electric slide gate valve 50 or a pneumatic slide gate valve 50. A drive mechanism drives the valve plate to reciprocate within the valve body, thereby opening and closing the valve. The slide gate valve 50 is electrically connected to a central control system (not shown in the figure), which automatically controls the opening and closing of each slide gate valve 50 according to the operating status of each graphitization furnace 100.

[0074] By controlling the opening and closing of each slide valve 50, any movable flue 20 can be selectively connected to either the first flue 31 (the fixed flue located below) or the second flue 32 (the fixed flue located above). Specifically, when a movable flue 20 at a certain furnace position needs to connect to the first flue 31, the first slide valve 50 corresponding to that furnace position is opened, and the second slide valve 50 corresponding to that furnace position is closed; when it needs to connect to the second flue 32, the second slide valve 50 corresponding to that furnace position is opened, and the first slide valve 50 corresponding to that furnace position is closed.

[0075] Example 2

[0076] A method for collecting flue gas from a graphitization furnace group, applicable to the flue gas collection system of the aforementioned graphitization furnace group, comprising:

[0077] S1. In the initial state, Furnace No. 1 is ready to be powered on, while Furnaces No. 2 through No. 8 are in a shutdown state. The operator places the furnace cover 10 on the furnace opening of Furnace No. 1 and places the movable flue pipe 20, which is connected to the furnace cover 10, on the platform 60 between Furnaces No. 1 and No. 2. One end of the movable flue pipe 20 is connected to the flue gas outlet pipe 21 of the furnace cover 10 on Furnace No. 1 through a connector, and the other end of the movable flue pipe 20 is connected to the air inlet branch pipe corresponding to the position of Furnace No. 1 (i.e., connected to the first flue pipe 31 located below) through a connector.

[0078] At this time, the central control system controls the opening of the first gate valve 50 corresponding to furnace position 1 and the closing of the second gate valve 50 corresponding to furnace position 1. All gate valves 50 corresponding to the other furnace positions are in the closed state. The first exhaust fan is started to start collecting the high-temperature flue gas generated during the power supply of furnace position 1. The flue gas generated in furnace position 1 passes through the furnace cover 10, flue gas outlet pipe 21, moving flue pipe 20, and inlet branch pipe in sequence into the first flue pipe 31 and is finally discharged. During the power supply period of furnace position 1 (about 3 and a half days), the filter module 40 in the moving flue pipe 20 performs preliminary filtration of the flue gas, intercepting large dust particles in the flue gas and reducing the load on the downstream processing equipment.

[0079] After S2 and No. 1 furnaces are powered on, the furnace temperature remains high (approximately 3000℃), and dust and flue gas continue to escape from the furnace. At this time, the movable flue pipe 20 and furnace cover 10 corresponding to No. 1 furnace remain covered, the first slide valve 50 remains open, and the first exhaust fan continues to collect the residual flue gas from No. 1 furnace through the first flue pipe 31 (the fixed flue pipe below). At the same time, No. 3 furnaces are powered on. The operator places the second set of furnace covers 10 on the furnace opening of No. 3 furnaces and places the movable flue pipe 20, which is connected to the second set of furnace covers 10, on the platform 60 between No. 3 and No. 4 furnaces.

[0080] One end of the movable flue pipe 20 is connected to the flue gas outlet pipe 21 of the furnace cover 10 on furnace No. 3 via a connector, and the other end of the movable flue pipe 20 is connected to the air inlet branch pipe corresponding to furnace No. 3 via a connector (i.e., connected to the second flue pipe 32 located above); at this time, the central control system controls the gate valve 50 corresponding to furnace No. 3 to open and controls the gate valve 50 corresponding to furnace No. 3 to close; at the same time, the first gate valve 50 corresponding to furnace No. 1 continues to remain open.

[0081] The second exhaust fan is started to collect the high-temperature flue gas generated during the power supply of Boiler No. 3. The flue gas generated in Boiler No. 3 passes sequentially through the furnace cover 10, the moving flue pipe 20, and the second flue pipe 32, and is finally sent to the flue gas treatment device at the rear end for purification treatment by the second exhaust fan.

[0082] The first exhaust fan draws residual flue gas from Boiler No. 1 through the first flue pipe 31, while the second exhaust fan draws power-supply flue gas from Boiler No. 3 through the second flue pipe 32. The two exhaust systems operate in parallel and independently without interfering with each other. It is worth mentioning that on the second day of power supply to Boiler No. 3 (approximately 3.5 days), the residual flue gas from Boiler No. 1 basically stops overflowing. At this time, the central control system controls the first gate valve 50 corresponding to Boiler No. 1 to close. The operator then separates the movable flue pipe 20 from the furnace cover 10 on Boiler No. 1 and the gas branch pipe corresponding to Boiler No. 1, and removes the furnace cover 10 from Boiler No. 1.

[0083] Subsequently, the furnace cover 10 is placed over the furnace opening of furnace No. 5, and the movable flue pipe 20 is transferred to the platform 60 between furnace No. 5 and furnace No. 6. One end of the movable flue pipe 20 is connected to the flue gas outlet pipe 21 of the furnace cover 10 on furnace No. 5, and the other end of the movable flue pipe 20 is connected to the air inlet branch pipe corresponding to furnace No. 5. The central control system controls the opening of the slide valve 50 corresponding to furnace No. 5, starts the first exhaust fan, and begins to collect the high-temperature flue gas generated during the power supply of furnace No. 5. After the power supply of furnace No. 3 is completed, the second set of furnace covers 10 and movable flue pipe 20 are transferred to the subsequent furnace positions in the same manner as above, and so on, so as to realize the rolling transfer and recycling of movable flue pipe 20 and furnace cover 10 between multiple graphitization furnaces 100.

[0084] Thus, only two sets of furnace covers 10 and two sets of movable smoke pipes 20 are needed to meet the flue gas collection needs of multiple graphitization furnaces 100, eliminating the need to configure a separate furnace cover 10 and smoke pipe for each graphitization furnace 100, which greatly reduces the number of equipment and lowers equipment investment and maintenance costs. The movable smoke pipes 20 can be separately placed on the platform 60 between adjacent graphitization furnaces 100, and can be flexibly transferred to different furnace positions according to the production progress of each furnace, realizing the dynamic allocation of flue gas collection resources and adapting to the process characteristics of intermittent production of graphitization furnaces 100.

[0085] Example 3

[0086] The movable flue is also equipped with a filter module 40 to perform preliminary filtration of the flue gas, reducing the load on downstream processing equipment and extending the service life of the downstream equipment. This module includes a connecting pipe 41, a filter screen 42, a temperature regulating component, and a nozzle 43. Specifically, the diameter of the connecting pipe 41 is larger than that of the movable flue 20. The movable flue 20 is inserted into the internal space of the connecting pipe 41 along the first direction L (the flue gas flow direction). The end of the connecting pipe 41 away from the movable flue 20 is connected to the fixed flue assembly 30 so that the movable flue 20 is connected to the fixed flue via the connecting pipe 41. The filter screen 42 is installed inside the connecting pipe 41, so that the flue gas can be filtered when it enters the connecting pipe 41 after passing through the movable flue 20.

[0087] More specifically, the end of the movable smoke pipe 20 located inside the connecting pipe 41 forms a flared portion 44 along the first direction L to connect with the filter screen 42; wherein, the flared portion 44 is in the shape of a trumpet and gradually widens along the first direction L; when the smoke passes through the flared portion 44, it has the function of diffusion, and can fully contact the filter screen 42 at the rear end to improve the filtration effect.

[0088] Specifically, the outer wall of the movable flue 20 located inside the connecting pipe 41 forms a cooling zone 45 with the inner wall of the connecting pipe 41 for mounting a temperature regulating component. The temperature regulating component is used to regulate the temperature of the flue gas flowing through the movable flue 20. By reducing the temperature of the flue gas during circulation, pollutants in the flue gas can be condensed into liquid or solid states, making them easier to be captured by the filter screen 42, thereby further improving the filtration effect.

[0089] More specifically, several nozzles 43 are provided and are arranged in a circular array along the circumferential direction of the flared part 44 on the inner wall; wherein, the projections of two adjacent nozzles along the circumferential direction on the same plane are 3cm apart.

[0090] Nozzle 43 forms a guide path Y for guiding the mixing of gas and flue gas; the guide path Y and the axis formed by the connecting pipe 41 form an angle on the same surface; wherein, the angles formed by two adjacent nozzles 43 in the clockwise and / or counterclockwise circumferential directions differ by 25°; one end of filter screen 42 is connected to flared part 44, and the other end is fixedly connected to the inner wall of connecting pipe 41; the port diameter of the end of filter screen 42 connected to flared part 44 is larger than the port diameter away from flared part 44;

[0091] Specifically, the temperature control components include: coil 46, cooler, fan 47, and temperature sensor; the coil 46 is made of copper and surrounds the outer wall of the movable flue located in the cooling zone 45. The coil 46 is connected to the external cooler. A heat transfer fluid flows inside the coil 46. The cooler can exchange heat with the coil 46 to provide a stable cold source to the cooling zone 45 and ensure efficient cooling.

[0092] Specifically, the connecting pipe 41 has an opening 48 at the location of the cooling zone 45 for mounting the fan 47; the fan 47 can blow air from the outside into the cooling zone 45, thereby further improving the cooling effect of the moving flue; and under the action of the fan 47, the nozzle 43 begins to blow out gas; due to the arrangement of the nozzles 43, the cold air is spirally sprayed out under the action of the guide path Y, and further mixed with the flue gas at the flared opening, thereby achieving a further cooling effect; at the same time, due to the cooling of the cooling zone 45, water droplets will form on the wall of the moving flue, and the nozzle 43 can also mix some water vapor with the flue gas when it sprays air, thereby adsorbing impurities in the flue gas and making it easier for the filter screen 42 to capture them.

[0093] The temperature sensor converts the detected temperature of the cooling zone 45 into a detection signal and transmits it to the central control system. The central control system receives the detection signal and selects an operating mode based on it, or converts the detection signal into a corresponding input command based on the current operating mode. The output commands include: preset target temperature, data viewing, data storage, locking or blocking the detection signal. The above scheme can make temperature control more stable.

[0094] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0095] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A flue gas collection system for a graphitization furnace group, integrated into several graphitization furnaces to achieve flue gas collection and filtration; wherein, Several of the graphitization furnaces are arranged in a line; characterized in that they include: A furnace cover is disposed on the graphitization furnace to cover the furnace opening; The movable flue pipe is connected to the furnace cover; A fixed flue assembly is connected to the movable flue. A filter module is disposed inside the movable smoke pipe; The furnace cover and the movable smoke pipe are provided in two sets. The movable smoke pipe is detachably placed on a platform between adjacent graphitization furnaces. One end of the movable smoke pipe is used to connect to the furnace cover covering the furnace opening of the graphitization furnace, and the other end is connected to the fixed smoke pipe through a connector. The fixed smoke pipe includes a first smoke pipe and a second smoke pipe disposed on the side of the first smoke pipe. The first smoke pipe and the second smoke pipe are independently connected to exhaust fans. By controlling the opening and closing of each of the gate valves, any one of the movable smoke pipes can selectively connect to the fixed smoke pipe located above or the fixed smoke pipe located below. The filter module filters impurities in the flue gas along the flue gas flow direction.

2. A method for collecting flue gas from a graphitization furnace group, characterized in that, The flue gas collection system applicable to the graphitization furnace group according to claim 1 includes: S1. During the power supply of the first graphitization furnace, the movable smoke pipe corresponding to the furnace cover on the first graphitization furnace is connected to the fixed smoke pipe located below through the connector, and the corresponding gate valve is opened to extract air. S2. During the period when the first graphitization furnace is powered off but flue gas is still overflowing, the movable flue pipe corresponding to the first graphitization furnace is kept connected to the first flue pipe; at the same time, during the period when the second graphitization furnace is powered on, the movable flue pipe corresponding to the furnace cover on the second graphitization furnace is connected to the second flue pipe through the connector, and the corresponding slide valve is opened to extract gas.

3. The flue gas collection method for the graphitization furnace group according to claim 2, characterized in that: After the first graphitization furnace stops escaping flue gas, the slide valve connected to the movable flue pipe corresponding to the first graphitization furnace is closed, the movable flue pipe corresponding to the first graphitization furnace is transferred to the platform between the third and fourth graphitization furnaces, and the furnace cover on the first graphitization furnace is transferred and placed on the third graphitization furnace.

4. The flue gas collection system for the graphitization furnace group according to claim 1, characterized in that: The filter module includes: A connecting pipe is used to connect the movable smoke pipe and the fixed smoke pipe assembly; A filter screen is installed inside the connecting pipe; A temperature regulating component is used to regulate the temperature of the flue gas flowing through the moving flue. A nozzle is positioned between the filter screen and the movable smoke pipe; The movable flue section is positioned inside the connecting pipe along the flue gas flow direction; the outer wall of the portion of the movable flue inside the connecting pipe forms a cooling zone with the inner wall of the connecting pipe for mounting the temperature regulating component; the nozzle communicates with the cooling zone.

5. The flue gas collection system for the graphitization furnace group according to claim 4, characterized in that: The movable flue forms a flared section that connects with the filter screen along the direction of flue gas flow; The nozzles are provided in a plurality of units and are arranged in a circular array along the circumferential direction of the flare on the inner wall of the flare portion; The projections of two adjacent nozzles along the circumferential direction on the same plane are 3 cm apart.

6. The flue gas collection system for the graphitization furnace group according to claim 5, characterized in that: The nozzle forms a guide path for guiding the mixing of gas and flue gas; The flow path and the axis formed by the connecting pipe form an angle on the same surface; The included angles formed by two adjacent nozzles along the clockwise and / or counterclockwise circumferential direction all differ by 20°-30°.

7. The flue gas collection system for the graphitization furnace group according to claim 6, characterized in that: One end of the filter screen is connected to the flared part, and the other end is fixedly connected to the inner wall of the connecting pipe; The diameter of the port at the connection end between the filter screen and the flared part is larger than the diameter of the port further away from the flared part.

8. The flue gas collection system for the graphitization furnace group according to claim 7, characterized in that: The temperature regulation component includes: A coil surrounds the outer wall of the movable flue located in the cooling zone; A cooler is connected to the coil to achieve heat exchange; A fan is mounted on the connecting pipe; A temperature sensor is used to detect the temperature of the cooling zone; The temperature sensor converts the detected temperature of the cooling zone into a detection signal and transmits it to the central processing system. The central processing system receives the detection signal and selects an operating mode based on the detection signal, or converts the detection signal into a corresponding input command based on the current operating mode. The output commands include: preset target temperature, data viewing, data storage, locking or blocking the detection signal.

9. The flue gas collection system for the graphitization furnace group according to claim 8, characterized in that: The connecting pipe has an opening at the location of the cooling zone for mounting a fan.

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