Sintering system

Abstract

The present application discloses a sintering system (100). The sintering system (100) comprises a rotary sintering furnace (10), which is provided with an exhaust port (13) used for discharging exhaust gas; and an exhaust gas treatment system (20), which is in communication with the exhaust port (13) and is used for treating the exhaust gas discharged from the rotary sintering furnace (10), wherein the exhaust gas treatment system (20) comprises multiple stages of treatment devices connected in series; at least one stage of treatment device is a dust separation device (30), and the dust separation device (30) is used for separating dust from the exhaust gas; at least one stage of treatment device is a spray tower (40), and the spray tower (40) is arranged downstream of the dust separation device (30) and is used for washing the exhaust gas treated by the dust separation device (30).

Description

Sintering system

[0001] Cross-reference to related applications

[0002] The present application claims priority to the priority of Chinese patent application No. "202410531975.0", "202420924373.7" filed on April 29, 2024 by Tianci Materials (Taizhou) Co., Ltd., Guangzhou Tianci High-tech Materials Co., Ltd., the contents of which are hereby incorporated by reference in its entirety into the present application. TECHNICAL FIELD

[0003] The present application relates to the technical field of sintering, more particularly, to a sintering system. BACKGROUND

[0004] The sintering process of lithium iron phosphate needs to be carried out in a protective gas atmosphere, and protective gas needs to be continuously introduced into the interior of a rotary furnace device, so the rotary furnace device needs to be provided with a gas introduction structure and an exhaust mechanism, and the tail gas discharged through the exhaust structure needs to be purified, otherwise it can seriously harm the environment.

[0005] SUMMARY

[0006] The present application aims to at least solve one of the technical problems existing in the prior art. To this end, one object of the present application is to provide a sintering system capable of introducing protective gas into a rotary sintering furnace and discharging tail gas, and capable of effectively purifying the tail gas to reduce the harm of tail gas emission to the environment.

[0007] According to the sintering system of the embodiments of the present application, the sintering system comprises: a rotary sintering furnace provided with an exhaust port for discharging tail gas; a tail gas treatment system in communication with the exhaust port and used for treating the tail gas discharged by the rotary sintering furnace, the tail gas treatment system comprising multiple levels of treatment devices connected in series, wherein at least one of the treatment devices is a dust separation device used for separating dust in the tail gas; and at least one of the treatment devices is a spray tower provided downstream of the dust separation device and used for washing the tail gas treated by the dust separation device.

[0008] According to the sintering system of the embodiments of the present application, by performing multi-stage tail gas treatment and including a dust separation device and a spray tower provided downstream of the dust separation device, dust, coal tar, low-valence alkane, water vapor and other impurities in the tail gas are removed, the impurity removal efficiency is improved, the impurity removal of the tail gas is more thorough, the emission harm of the tail gas is reduced, and the environment is protected and the health of production personnel and surrounding residents is protected.

[0009] In addition, the sintering system according to the above embodiments of the present application can also have the following additional technical features:

[0010] According to some embodiments of the present application, the dust separation device comprises a settling tank, the settling tank comprises a tank body and a plurality of baffles arranged in the tank body, the tank body is provided with a first inlet and a first outlet, the baffles extend in a vertical direction or an inclined downward direction, the plurality of baffles are arranged staggered in a horizontal direction and separate the space in the tank body into a plurality of subspaces arranged in the horizontal direction, two subspaces at both ends of the horizontal direction are respectively communicated with the first inlet and the first outlet, the baffles are provided with a communication port for communicating adjacent two subspaces, and the projection of the communication ports of any adjacent two baffles along the arrangement direction of the baffles does not coincide.

[0011] According to some embodiments of the present application, the settling tank further comprises a dust discharge port at the bottom, and each of the plurality of subspaces is communicated with the dust discharge port.

[0012] According to some embodiments of the present application, the tank body comprises a flow guide cavity and a dust collection cavity communicated with the flow guide cavity, the flow guide cavity is located above the dust collection cavity, and the cross-sectional area of the dust collection cavity on a horizontal plane gradually decreases in a direction away from the flow guide cavity, and the dust discharge port is communicated with the dust collection cavity.

[0013] According to some embodiments of the present application, the dust separation device comprises a tee pipe, a buffer tank and a cyclone separator, the tee pipe comprises a first pipe body, a second pipe body and a third pipe body, the gas inlet end of the first pipe body is communicated with the exhaust port, the gas outlet end of the first pipe body is communicated with the gas inlet end of the second pipe body and the gas inlet end of the third pipe body, the gas outlet end of the second pipe body is communicated with the cyclone separator, the gas outlet end of the third pipe body is communicated with the buffer tank, the gas inlet end of the first pipe body is not lower than the gas outlet end of the first pipe body in the vertical direction, the gas outlet end of the third pipe body is lower than the gas inlet end of the third pipe body in the vertical direction, the included angle between the first pipe body and the second pipe body is a, the included angle between the second pipe body and the vertical downward direction is b, and the included angle between the third pipe body and the vertical downward direction is c, wherein a≥90°, b>0°, and c≤b.

[0014] According to some embodiments of the present application, the dust separation device comprises a tee pipe, a buffer tank and a cyclone separator, the tee pipe comprises a first pipe body, a second pipe body and a third pipe body, the gas inlet end of the first pipe body is communicated with the exhaust port, the gas outlet end of the first pipe body is communicated with the gas inlet end of the second pipe body and the gas inlet end of the third pipe body, the gas outlet end of the second pipe body is communicated with the cyclone separator, the gas outlet end of the third pipe body is communicated with the buffer tank, the first pipe body and the third pipe body both extend in the vertical direction, and the second pipe body extends in the horizontal direction.

[0015] According to some embodiments of the present application, the top of the buffer tank is provided with a first opening and the bottom is provided with a second opening, the first opening is communicated with the tee pipe, and the second opening is used for discharging sediment and is provided with an on-off valve; the top of the cyclone separator is provided with a third opening and a fourth opening, and the bottom is provided with a fifth opening, the third opening is communicated with the tee pipe, the fourth opening is communicated with the downstream treatment device, and the fifth opening is used for discharging sediment and is provided with an on-off valve.

[0016] According to some embodiments of the present application, the spray tower comprises a tower body, a spray assembly, a liquid redistributor and a demister, the side of the tower body is provided with a second inlet and the top is provided with a second outlet, the spray assembly comprises a spray head, the spray head is arranged in the tower body and located between the second inlet and the second outlet, the liquid redistributor is located between the spray head and the second inlet, and the demister is located between the spray head and the second outlet.

[0017] According to some embodiments of the present application, the spray head is multiple and arranged in multiple layers in the vertical direction, and the liquid redistributor is arranged below each layer of the spray head, and the demister is arranged above the multiple layers of the spray head.

[0018] According to some embodiments of the present application, the tail gas treatment system is further connected in series with an induced draft fan, and the induced draft fan is used to drive the tail gas to flow in the tail gas treatment system.

[0019] According to some embodiments of the present application, the tail gas treatment system is communicated with the exhaust port through a first connecting pipe, and the height of the first connecting pipe in the vertical direction increases first and then decreases from one end of the first connecting pipe to the other end.

[0020] According to some embodiments of the present application, the first connecting pipe comprises a first pipe section and a second pipe section, the first pipe section connects the exhaust port and the second pipe section, the second pipe section connects the first pipe section and the tail gas treatment system, the first pipe section and the second pipe section extend downward and away from each other from the connection position, and the included angle between the first pipe section and the second pipe section is greater than or equal to 60°.

[0021] According to some embodiments of the present application, at least one of the exhaust port and the tail gas treatment system is connected with the first connecting pipe through a flexible pipe.

[0022] According to some embodiments of the present application, the polishing degree Ra of the first connecting pipe is less than or equal to 0.8 μm; and / or, the polishing degree Ra of the inner wall surface of the treatment device is less than or equal to 0.8 μm.

[0023] According to some embodiments of the present application, the rotary sintering furnace is provided with a furnace cavity, and a gas inlet and a gas outlet communicating with the furnace cavity, the gas inlet being used for introducing a protective gas into the furnace cavity, and the gas outlet being used for discharging tail gas in the furnace cavity; the rotary sintering furnace is provided with a feeding port and a discharging port at two axial ends thereof, respectively, and the feeding port and the gas outlet are arranged at the same axial end of the rotary sintering furnace, and the discharging port and the gas inlet are arranged at the same axial end of the rotary sintering furnace.

[0024] According to some embodiments of the present application, the sintering system further comprises a knocking device used for knocking the treatment device; and / or, the knocking device is used for knocking a first connecting pipe connecting the tail gas treatment system and the gas outlet; and / or, the knocking device is used for knocking a second connecting pipe connecting two adjacent treatment devices.

[0025] According to some embodiments of the present application, the first connecting pipe and / or the dust separation device are provided with a heat preservation structure.

[0026] According to some embodiments of the present application, the sintering system is applied to the preparation of new energy materials to perform dynamic sintering on raw materials, and the new energy materials include lithium ion battery positive electrode materials, and the lithium ion battery positive electrode materials include one of lithium iron phosphate, lithium cobaltate and lithium nickel cobalt manganese oxide.

[0027] Additional aspects and advantages of the present application will be in part apparent and in part pointed out hereinafter. BRIEF DESCRIPTION OF DRAWINGS

[0028] The above and / or additional aspects and advantages of the present application will become apparent and be readily appreciated from the following description, including the appended drawings.

[0029] Fig. 1 is a structural schematic view of a sintering system according to an embodiment of the present application;

[0030] Fig. 2 is a plan view at a settling tank according to an embodiment of the present application;

[0031] Fig. 3 is a sectional view at a settling tank according to an embodiment of the present application, a plurality of baffles being arranged staggered along a horizontal direction;

[0032] Fig. 4 is a sectional view at a settling tank of a comparative scheme, a plurality of baffles being arranged staggered along a vertical direction;

[0033] Fig. 5 is a partial structural schematic view of a sintering system according to an embodiment of the present application.

[0034] : sintering system 100; rotary sintering furnace 10; furnace cavity 11; air inlet 12; air outlet 13; material inlet 14; furnace body 15; tail gas treatment system 20; dust separation device 30; settling tank 31; tank body 32; first inlet 321; first outlet 322; dust discharge port 323; flow guide cavity 324; dust collection cavity 325; baffle 33; communication port 331; sub-space 34; tee pipe 35; first pipe body 351; second pipe body 352; third pipe body 353; buffer tank 36; first opening 361; second opening 362; cyclone separator 37; third opening 371; fourth opening 372; fifth opening 373; blocking piece 374; spray tower 40; tower body 41; second inlet 411; second outlet 412; spray assembly 42; liquid redistributor 43; demister 44; induced draft fan 51; exhaust pump 52; exhaust pipe 53; first connecting pipe 60; first pipe section 61; second pipe section 62; second connecting pipe 70; flexible pipe 80; on-off valve 90. DETAILED DESCRIPTION

[0035] Embodiments of the present application are described below in detail with reference to examples thereof as illustrated in the accompanying drawings, wherein like or similar elements are denoted by like or similar reference signs throughout the description. The embodiments described below by reference to the drawings are exemplary only, and are merely intended to explain the present application, and cannot be understood as limiting the present application.

[0036] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0037] In the description of the present application, "first feature" and "second feature" can include one or more features, the meaning of "multiple" is two or more, and "above" or "below" the first feature with respect to the second feature can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them, and "above", "over" and "on" the first feature with respect to the second feature include that the first feature is directly above and obliquely above the second feature, or only means that the first feature is higher than the second feature in horizontal height.

[0038] A sintering system 100 according to embodiments of the present application is described below with reference to the accompanying drawings.

[0039] Referring to FIGS. 1-5, the sintering system 100 according to embodiments of the present application can include a rotary sintering furnace 10 and a tail gas treatment system 20.

[0040] Specifically, the rotary sintering furnace 10 is provided with an exhaust port 13 for discharging tail gas. The tail gas treatment system 20 is in communication with the exhaust port 13 and is used to treat the tail gas discharged from the rotary sintering furnace 10, and the tail gas treatment system 20 includes multiple levels of treatment devices in series. Among them, at least one level of treatment device is a dust separation device 30, which is used to separate dust particles in the tail gas; at least one level of treatment device is a spray tower 40, which is arranged downstream of the dust separation device 30 and is used to wash the tail gas treated by the dust separation device 30.

[0041] The rotary sintering furnace 10 is used for sintering and other work of the material, and the protective gas such as inert gas (such as nitrogen) can be introduced into the rotary sintering furnace 10, which is beneficial to ensure the protective gas atmosphere inside the rotary sintering furnace 10, so as to avoid the high oxygen content in the rotary sintering furnace 10 affecting the roasting of the material such as lithium iron phosphate, for example, the high oxygen content will cause more lithium iron phosphate to be oxidized into trivalent iron salt and other by-products. By sintering the material in a protective gas atmosphere, it is beneficial to improve the product quality.

[0042] During the raw material feeding process and the movement and sintering of the material in the rotary sintering furnace 10, production dust will be generated, and at the same time, due to the moisture and impurities carried by the lithium iron phosphate raw material prepared in the previous process, water vapor, coal tar and low alkanes will be generated during initial sintering. These production dust, water vapor, coal tar and low alkanes will be discharged as tail gas with the protective gas inside the rotary sintering furnace 10. The protective gas is introduced into the rotary sintering furnace 10, and the tail gas in the rotary sintering furnace 10 is discharged through the exhaust port 13, so as to continuously introduce the protective gas into the rotary sintering furnace 10, which is beneficial to maintain the protective gas atmosphere of the material in the rotary sintering furnace 10, avoid the influence of water vapor, coal tar and low alkanes mixed in the gas on the sintering of the material, and reduce the product quality.

[0043] The tail gas discharged from the exhaust port 13 is purified by the tail gas treatment system 20 to remove dust, coal tar, water vapor and other impurities in the tail gas, which can avoid the direct discharge of the tail gas causing serious harm to the environment, and is beneficial to protect the environment and protect the health of production personnel and surrounding residents. Specifically, a large amount of dust contained in the tail gas can be separated out by the dust separation device 30, greatly reducing the dust content in the tail gas and achieving preliminary impurity removal treatment of the tail gas. The tail gas treated by the dust separation device 30 can be washed by the spray tower 40 arranged downstream of the dust separation device 30 to separate out a small amount of dust, coal tar, low-valence alkanes, water vapor and other impurities in the tail gas, further remove impurities from the tail gas, and make the tail gas purification more thorough and more beneficial to discharge and more friendly to the environment.

[0044] The tail gas is treated by the dust separation device 30 and the spray tower 40 in multiple stages (which can be two stages, three stages or more stages), and the spray tower 40 is arranged downstream of the dust separation device 30 to facilitate the staged treatment of the tail gas, i.e., the tail gas is treated by dust removal and then by washing, which avoids too much dust in the tail gas causing too low washing efficiency and avoids too high humidity of the tail gas causing too low dust removal efficiency, improves the impurity removal efficiency, and makes the impurity removal of the tail gas more thorough.

[0045] The dust separation device 30 can be multiple, which is beneficial to multiple dust removal treatment of the tail gas, and the spray tower 40 can be multiple, which is beneficial to multiple washing of the tail gas, realizes more staged treatment of the tail gas, and has higher impurity removal efficiency. Of course, in addition to the dust separation device 30 and the spray tower 40, the tail gas treatment system 20 can further include more other treatment devices to treat the tail gas.

[0046] According to the sintering system 100 of the embodiment of the present application, the tail gas is treated by multiple stages and includes the dust separation device 30 and the spray tower 40 arranged downstream of the dust separation device 30, which removes dust, coal tar, low-valence alkanes, water vapor and other impurities in the tail gas, improves the impurity removal efficiency, makes the impurity removal of the tail gas more thorough, reduces the discharge harm of the tail gas, and is beneficial to protect the environment and protect the health of production personnel and surrounding residents.

[0047] In some embodiments of the present application, the sintering system 100 is applied to the preparation of new energy materials to perform dynamic sintering on raw materials, and the new energy materials include lithium ion battery cathode materials, which include one of lithium iron phosphate, lithium cobaltate, and lithium nickel cobalt manganese oxide. New energy materials such as lithium ion battery cathode materials are prone to produce production dust, water vapor, coal tar, and low-value alkanes and other impurities during the sintering process. By using the sintering system 100 of the present application to sinter the lithium ion battery cathode material, the protective gas can be continuously introduced into the rotary sintering furnace 10 to remove the impurities in the raw materials with the protective gas, reduce the adverse effects of impurities on material sintering, improve product quality, and remove the tail gas in the rotary sintering furnace 10 after impurity removal treatment and discharge to the outside, which is beneficial to protect the environment and protect the health of production personnel and surrounding residents.

[0048] In some embodiments of the present application, as shown in FIGS. 1-3, the dust separation device 30 includes a settling tank 31, the settling tank 31 includes a tank body 32 and a plurality of baffles 33 arranged in the tank body 32, and the tank body 32 is provided with a first inlet 321 and a first outlet 322. The baffles 33 extend in the vertical direction (for example, the up-down direction shown in FIG. 3) or extend in the inclined downward direction (for example, form 5°, 10°, 15°, 20°, 25°, 30°, etc. with the vertical downward direction), and the plurality of baffles 33 are arranged staggered and spaced apart in the horizontal direction (for example, the front-back direction shown in FIG. 3) and divide the space in the tank body 32 into a plurality of subspaces 34 arranged in the horizontal direction. The two subspaces 34 at both ends of the horizontal direction are respectively communicated with the first inlet 321 and the first outlet 322.

[0049] The baffles 33 are provided with a communication port 331 for communicating between two adjacent subspaces 34, and the projections of the communication ports 331 of any two adjacent baffles 33 along the arrangement direction of the baffles 33 do not coincide. Specifically, the four peripheral edges of the baffles 33 are connected with the inner wall of the tank body 32, the communication ports 331 are formed by direct hole forming of the baffles 33, or at least part of the edges of the baffles 33 are not connected with the inner wall of the tank body 32, and the communication ports 331 are formed by the edges of the baffles 33 and the inner wall of the tank body 32. The plurality of baffles 33 are arranged staggered and spaced apart in the horizontal direction, that is, the projections of the plurality of baffles 33 in the horizontal direction have coinciding parts and non-coinciding parts, and the projections of the communication ports 331 of any two adjacent baffles 33 in the horizontal direction do not coincide.

[0050] The exhaust gas discharged from the exhaust port 13 enters the settling tank 31 from the first inlet 321 and is discharged from the settling tank 31 from the first outlet 322. During the process of the exhaust gas flowing from the first inlet 321 to the first outlet 322 in the tank body 32, the dust in the exhaust gas is settled under the action of gravity, and the exhaust gas is blocked by the baffle 33 and cannot flow directly from the first inlet 321 to the first outlet 322 along the line connecting the first inlet 321 and the first outlet 322. The exhaust gas collides with the baffle 33 during the flow process, which makes the dust more easily settled, thereby improving the dust removal efficiency of the exhaust gas.

[0051] The exhaust gas is blocked by the baffle 33 and can only enter the adjacent sub-space 34 through the communication port 331, so that the exhaust gas flows from the first inlet 321 to the first outlet 322 through the plurality of sub-spaces 34 in sequence along a curve (for example, the curve with an arrow shown in FIG. 3), thereby prolonging the flow path of the exhaust gas and making more dust settled during the flow process of the exhaust gas, thereby improving the dust removal efficiency of the exhaust gas.

[0052] It is worth noting that, as shown in FIG. 2, the first inlet 321 can be a plurality of first inlets 321, one of which is in operation while the rest are in a closed state, thereby avoiding the blockage of one first inlet 321 to prevent the exhaust gas discharged from the exhaust port 13 from entering the settling tank 31, reducing the probability of blockage of the dust separation device 30 and improving the dust removal reliability. The settling tank 31 can also be provided with a maintenance opening for cleaning and other maintenance work on the wall-adhered materials inside the settling tank 31. The maintenance opening can be a plurality of openings (two, three or more), which are preferably opened at the top of the settling tank 31 and are reasonably distributed according to the actual shape and size of the settling tank 31, thereby improving the cleaning effect and operation efficiency.

[0053] The first inlet 321 and the first outlet 322 are arranged in the horizontal direction, and the projections of the communication ports 331 of any two adjacent baffles 33 in the horizontal direction do not coincide, thereby prolonging the flow path of the exhaust gas to improve the blocking effect of the plurality of baffles 33 on the exhaust gas and improve the settling rate of the dust in the exhaust gas.

[0054] In some embodiments, the settling tank 31 further comprises a dust discharge port 323 at the bottom, and the plurality of sub-spaces 34 are in communication with the dust discharge port 323, thereby enabling the dust settled in the plurality of sub-spaces 34 to settle to the dust discharge port 323 at the bottom, so as to discharge the dust and reduce the possibility of blockage of the settling tank 31, such as blockage of the communication port 331, thereby improving the reliability of the exhaust gas treatment in the settling tank 31.

[0055] In some embodiments, the tank body 32 comprises a guide cavity 324 and a dust collection cavity 325 in communication with the guide cavity 324, the guide cavity 324 is located above the dust collection cavity 325, and the cross section of the dust collection cavity 325 on the horizontal plane gradually decreases in the direction away from the guide cavity 324, and the dust outlet 323 is in communication with the dust collection cavity 325. The dust collection cavity 325 is arranged to be tapered, that is, the side wall of the dust collection cavity 325 can form an upward guide effect on the airflow, so that the airflow tends to flow around between the plurality of subspaces 34, and at the same time, it is beneficial to the concentrated collection of dust.

[0056] The arrangement of the plurality of subspaces 34 in the horizontal direction is beneficial to directly communicate the bottoms of the plurality of subspaces 34 with the dust outlet 323 respectively, so that the dust can directly settle in the dust outlet 323, rather than continue to move in a long flow path or slide along the surface of the baffle 33 to move between the plurality of baffles 33, thereby repeatedly mixing and separating with the airflow, improving the dust removal efficiency of the tail gas, facilitating the rapid settlement and removal of dust, and avoiding the problems of affecting the rate and effect of dust settlement and separation of the subsequent tail gas entering over time due to the accumulation of dust, and the difficulty of cleaning due to the accumulation of dust in the baffle 33.

[0057] For example, the scheme shown in FIG. 4 is taken as a comparative example, in which the baffle 33 extends downwardly along the horizontal direction, the plurality of baffles 33 are arranged in a staggered manner along the vertical direction and separate the space in the tank body 32 into a plurality of subspaces 34 arranged along the vertical direction, and the two subspaces 34 located at the two ends of the vertical direction are respectively in communication with the first inlet 321 and the first outlet 322. The first inlet 321 can be arranged on the upper side or the lower side of the first outlet 322. The plurality of baffles 33 are arranged in a staggered manner along the vertical direction, that is, the projection of the plurality of baffles 33 along the vertical direction has overlapping and non-overlapping parts, and the projections of the communication ports 331 of any two adjacent baffles 33 along the vertical direction do not overlap.

[0058] In this comparative scheme, although the arrangement of the plurality of baffles 33 can also prolong the flow path of the tail gas to improve the blocking effect of the tail gas, the dust settled by gravity needs to continue to move along the winding flow path of the airflow to reach and collect at the bottom of the tank body 32, which greatly affects the dust separation and collection efficiency, and the dust will deposit on the inclined baffle 33, which will lead to cleaning difficulty after long-term accumulation, and the accumulated dust will slide down along the surface of the baffle 33, thereby detaching from the baffle 33 and re-mixing with the airflow, resulting in repeated settlement or the accumulated dust falling to the lower baffle 33 and causing dust raising due to impact force, which worsens the dust separation effect.

[0059] The settling tank 31 can be one, two or more, facilitating multi-stage processing of the tail gas. For example, in some embodiments, the settling tank 31 is two, wherein the baffle 33 in one of the settling tanks 31 extends downwardly in a horizontal direction, and the baffle 33 in the other of the settling tanks 31 extends in a vertical direction.

[0060] In some embodiments, the bottom dust discharge port 323 of the settling tank 31 is provided with an on-off valve 90, which can control the opening degree of the dust discharge port 323, facilitate opening of the dust discharge port 323 to discharge the dust accumulated in the settling tank 31, or control the dust discharge port 323 to be not fully opened to simultaneously perform the functions of dust settling and discharging, or close the dust discharge port 323 to avoid external gas entering the settling tank 31 and then entering the exhaust port 13, thereby facilitating protection of the protective gas atmosphere in the rotary sintering furnace 10. The on-off valve 90 in the present application can be one or more, and each on-off valve 90 can be a butterfly valve, a ball valve, etc.

[0061] The settling tank 31 is not prone to clogging, and the settling tank 31 can discharge the sediment through only one outlet. Since the sediment discharge outlet of the settling tank 31 is also the contact and exposure port of the tail gas treatment system 20 to the outside, it is beneficial to reduce the exposure port of the tail gas to the outside air, reduce the air entering the settling tank 31 from the broken air port and then entering the rotary sintering furnace 10 from the exhaust port 13, reduce the oxygen content in the tail gas treatment system 20 and the rotary sintering furnace 10, prevent the oxygen content in the tail gas treatment system 20 and the rotary sintering furnace 10 from exceeding the standard, facilitate control of the oxygen content of the sintered product, and improve the product quality.

[0062] In some embodiments of the present application, as shown in FIG. 5, the dust separation device 30 includes a tee pipe 35, a buffer tank 36 and a cyclone separator 37. The tee pipe 35 includes a first pipe body 351, a second pipe body 352 and a third pipe body 353. The gas inlet end of the first pipe body 351 is in communication with the exhaust port 13. The gas outlet end of the first pipe body 351 is in communication with the gas inlet end of the second pipe body 352 and the gas inlet end of the third pipe body 353. The gas outlet end of the second pipe body 352 is in communication with the cyclone separator 37. The gas outlet end of the third pipe body 353 is in communication with the buffer tank 36. The gas inlet end of the first pipe body 351 is not lower than the gas outlet end of the first pipe body 351 in the vertical direction. The gas outlet end of the third pipe body 353 is lower than the gas inlet end of the third pipe body 353 in the vertical direction. The included angle between the first pipe body 351 and the second pipe body 352 is a. The included angle between the second pipe body 352 and the vertically downward direction is b. The included angle between the third pipe body 353 and the vertically downward direction is c. Wherein, a≥90°, b>0°, and c≤b.

[0063] The exhaust gas discharged from the exhaust port 13 first enters the first pipe body 351, so that the exhaust gas discharged into the first pipe body 351 can be discharged to the gas outlet end of the first pipe body 351 at least under the action of gravity to be discharged to the gas inlet end of the second pipe body 352 and the gas inlet end of the third pipe body 353, reducing the possibility of backflow of the exhaust gas in the first pipe body 351 and making the exhaust gas discharge more reliable.

[0064] The exhaust gas discharged from the exhaust port 13 enters the three-way pipe 35 and is discharged to the buffer tank 36 and the cyclone separator 37, so that the dust with larger particles in the exhaust gas moves downward due to its own gravity when passing through the buffer tank 36 and is settled in the buffer tank 36, which is beneficial to make more large-particle dust in the exhaust gas enter the buffer tank 36 through the third pipe body 353, and realize the dust removal treatment of the exhaust gas.

[0065] And it is beneficial to reduce the wind resistance of the exhaust gas discharged from the first pipe body 351 to the second pipe body 352, so that the exhaust gas is discharged into the cyclone separator 37 more quickly, which is beneficial to improve the exhaust gas treatment efficiency. After the exhaust gas is discharged into the cyclone separator 37, the dust with smaller particles in the exhaust gas moves in a centrifugal manner in the cyclone separator 37 and is thrown to the peripheral wall of the cyclone separator 37 and then settled at the bottom of the cyclone separator 37, realizing the dust removal treatment of the exhaust gas. That is, the exhaust gas is subjected to multi-stage treatment in the dust separation device 30, especially, it is beneficial to remove large-particle dust and small-particle dust in the exhaust gas, and the dust removal efficiency is higher.

[0066] It is worth noting that the exhaust gas does not need to enter the buffer tank 36 to be subjected to dust removal treatment by the buffer tank 36 when passing through the third pipe body 353, that is, when the exhaust gas passes through the third pipe body 353, the large-particle dust mixed in the exhaust gas moves downward into and collects in the buffer tank 36 due to its own gravity, and the gas can directly pass through the second pipe body 352 to enter the cyclone separator 37, which shortens the dust removal time of the exhaust gas in the buffer tank 36 and improves the dust removal efficiency.

[0067] The three-way pipe 35 is used to connect the exhaust port 13, the buffer tank 36 and the cyclone separator 37, only one opening needs to be arranged on the buffer tank 36 to connect the exhaust port 13 and the cyclone separator 37, and multiple openings do not need to be arranged on the buffer tank 36 to respectively connect the exhaust port 13 and the cyclone separator 37, which reduces the number of openings of the buffer tank 36 and the connected area of the buffer tank 36 with the outside, and is beneficial to protect the protective gas atmosphere in the buffer tank 36 and further protect the protective gas atmosphere in the rotary sintering furnace 10.

[0068] It should be noted that the angle b between the second pipe body 352 and the vertical direction can be equal to 0° only when the intake end of the second pipe body 352 is directly below the exhaust end in the vertical direction, that is, the exhaust gas at the second pipe body 352 can flow vertically upward from the intake end to the exhaust end to enter the cyclone separator 37 without flowing vertically downward from the intake end to the exhaust end, so that more dust in the exhaust gas enters the buffer tank 36 rather than the cyclone separator 37, which is beneficial to improve the processing efficiency of the buffer tank 36 and the cyclone separator 37 on the exhaust gas.

[0069] It can be understood that b is not equal to 0°, that is, the second pipe body 352 does not extend downward in the vertical direction, and c≤b, that is, the third pipe body 353 can be closer to the vertically downward direction than the second pipe body 352, so that more exhaust gas discharged from the first pipe body 351 is discharged to the third pipe body 353, which is beneficial to realize the sedimentation of large-particle dust in the exhaust gas in the buffer tank and improve the exhaust gas processing efficiency. For example, in some embodiments, a is 180°, b is 90°, and c is 0°, that is, the intake end of the first pipe body 351 extends horizontally toward the exhaust end, the intake end of the second pipe body 352 extends horizontally toward the exhaust end, and the intake end of the third pipe body 353 extends downward in the vertical direction toward the exhaust end. In some embodiments, a is 90°, b is 45°, and c is 30°, that is, the intake end of the first pipe body 351 extends downward and obliquely toward the exhaust end, the intake end of the second pipe body 352 extends downward and obliquely toward the exhaust end, the intake end of the third pipe body 353 extends downward and obliquely toward the exhaust end, and the third pipe body 353 is closer to the vertically downward direction than the second pipe body 352. This is beneficial to reduce the exhaust gas discharge resistance and make more large-particle dust in the exhaust gas discharged to the sedimentation tank 36.

[0070] In some embodiments, as shown in FIG. 5, the dust separation device 30 includes a three-way pipe 35, a buffer tank 36, and a cyclone separator 37. The three-way pipe 35 includes a first pipe body 351, a second pipe body 352, and a third pipe body 353. The intake end of the first pipe body 351 is in communication with the exhaust port 13. The exhaust end of the first pipe body 351 is in communication with the intake end of the second pipe body 352 and the intake end of the third pipe body 353. The exhaust end of the second pipe body 352 is in communication with the cyclone separator 37. The exhaust end of the third pipe body 353 is in communication with the buffer tank 36. The first pipe body 351 and the third pipe body 353 both extend in the vertical direction, and the second pipe body 352 extends in the horizontal direction.

[0071] The exhaust gas discharged from the exhaust port 13 firstly enters the first pipe body 351, so that the exhaust gas is more discharged in the vertical direction in the first pipe body 351 to the second pipe body 352 and in the vertical direction in the second pipe body 352 to the buffer tank 36, and the larger particle dust in the exhaust gas is more easily discharged in the vertical direction to the buffer tank 36 under the action of its own gravity, which is beneficial to remove more dust such as large particle dust in the exhaust gas. The exhaust gas after dust removal by the buffer tank 36 and the exhaust gas carrying smaller particle dust discharged from the first pipe body 351 can be discharged to the second pipe body 352 and in the horizontal direction in the second pipe body 352 to the cyclone separator 37, so as to further remove dust from the exhaust gas by the cyclone separator 37, which is beneficial to realize the staged treatment of the exhaust gas in the dust separation device 30 and improve the dust removal efficiency.

[0072] In some embodiments, as shown in FIG. 5, the top of the buffer tank 36 is provided with a first opening 361 and the bottom is provided with a second opening 362, the first opening 361 is communicated with the three-way pipe 35, and the second opening 362 is used for discharging sediment and is provided with an on-off valve 90. The top of the cyclone separator 37 is provided with a third opening 371 and a fourth opening 372, and the bottom is provided with a fifth opening 373, the third opening 371 is communicated with the three-way pipe 35, the fourth opening 372 is communicated with a downstream treatment device, and the fifth opening 373 is used for discharging sediment and is provided with an on-off valve 90.

[0073] The exhaust gas discharged from the exhaust port 13 can be discharged from the top of the buffer tank 36 to the buffer tank 36 through the first opening 361 at the top of the buffer tank 36, so that the large particle dust in the exhaust gas is settled to the bottom of the buffer tank 36 from the top of the buffer tank 36 under the action of its own gravity, which prolongs the settling path of the large particle dust to improve the dust removal efficiency of the exhaust gas. The large particle dust settled to the bottom of the buffer tank 36 accumulates together to form sediment, which can be discharged through the second opening 362 at the bottom of the buffer tank 36 and the on-off valve 90 at the second opening 362. Specifically, the opening degree of the second opening 362 can be controlled by the on-off valve 90, so as to open the second opening 362 to discharge the sediment in the buffer tank 36, or control the second opening 362 to be opened partially to simultaneously perform the functions of dust settling and discharging, or close the second opening 362 to avoid external gas entering the buffer tank 36 through the second opening 362, thereby protecting the protective gas atmosphere in the rotary hearth furnace 10.

[0074] The tail gas in the three-way pipe 35 can be discharged from the top of the cyclone separator 37 to the cyclone separator 37 through the third opening 371 at the top of the cyclone separator 37, so that the dust in the tail gas is settled to the bottom of the cyclone separator 37 under the action of gravity and centrifugal force of the cyclone separator 37, and the settling path of the dust is prolonged to improve the dust removal efficiency of the tail gas. The dust settled to the bottom of the cyclone separator 37 accumulates to form a sediment, which can be discharged through the fifth opening 373 at the bottom of the cyclone separator 37 and the on-off valve 90 at the fifth opening 373. Specifically, the opening degree of the fifth opening 373 can be controlled by the on-off valve 90, so as to open the fifth opening 373 to discharge the sediment in the cyclone separator 37, or control the fifth opening 373 to be partially opened to simultaneously perform the functions of centrifugal settling and discharging, or close the fifth opening 373 to prevent external gas from entering the cyclone separator 37 through the fifth opening 373 and thus protect the protective gas atmosphere in the rotary sintering furnace 10.

[0075] After the tail gas is centrifugally settled in the cyclone separator 37, more dust is removed from the tail gas, so that the tail gas is lighter and easier to rise to the top of the cyclone separator 37 and be discharged to the downstream treatment device such as the spray tower 40 through the fourth opening 372 at the top of the cyclone separator 37 for next-stage impurity removal work, so as to realize the purification treatment of the tail gas by the multi-stage treatment device.

[0076] Specifically, the tail gas can enter the cyclone separator 37 from the tangential direction through the third opening 371 to improve the tangential acceleration of the tail gas, so as to accelerate the centrifugal motion of the tail gas in the cyclone separator 37 and thus improve the centrifugal dust removal effect of the tail gas. It is worth noting that, as shown in FIG. 5, the fourth opening 372 is located above the third opening 371, and a blocking piece 374 is arranged between the third opening 371 and the fourth opening 372, so that the tail gas discharged into the cyclone separator 37 through the third opening 371 is not easy to be directly discharged from the fourth opening 372, thereby improving the reliability of dust removal of the tail gas.

[0077] The buffer tank 36 can be a hollow tank body, i.e., the inside of the buffer tank 36 has no structure, which is beneficial to the settlement of the dust in the tail gas to the bottom of the buffer tank 36. The bottom of the buffer tank 36 can be designed as an inverted cone, which is convenient for discharging the sediment from the bottom cone. The specific size of the buffer tank 36 and the cyclone separator 37 can be determined according to the flow rate of the tail gas, the dust content in the tail gas, the particle size of the dust, etc. For example, in some specific embodiments, the dust content in the tail gas is 30 kg / day, the flow rate of the tail gas is 0.2-0.8 m / s, the volume of the buffer tank 36 is 1 m 3 .

[0078] In some embodiments, the plurality of dust separation devices 30 includes at least one dust separation device 30 comprising a settling tank 31, at least one dust separation device 30 comprising a tee 35, a buffer tank 36, and a cyclone 37, to achieve multi-stage dust removal of the tail gas.

[0079] Since the rotary sintering furnace 10 is a high-temperature sintering environment, the dust separation device 30 is in communication with the exhaust port 13 of the rotary sintering furnace 10. In some embodiments of the present application, a heat preservation structure is provided outside the dust separation device 30, such as heat preservation cotton, a heat preservation shell, etc., to avoid condensation of water in the tail gas in the dust separation device 30, to make the tail gas flow more smooth, and to improve the efficiency of tail gas treatment. The thickness of the heat preservation cotton can be greater than or equal to 10 mm, for example, the thickness of the heat preservation cotton can be set to 10 mm, 20 mm, 30 mm, 40 mm, 50 mm, etc. The heat preservation shell can be a heat preservation metal shell or a heat preservation plastic shell, for example, the heat preservation shell can be a heat preservation aluminum shell, a polyvinyl chloride (PVC) heat preservation shell, a polyvinylidene fluoride (PVDF) heat preservation shell, etc.

[0080] In some embodiments of the present application, as shown in FIGS. 1 and 5, the spray tower 40 comprises a tower body 41, a spraying assembly 42, a liquid redistributor 43, and a demister 44. The side of the tower body 41 is provided with a second inlet 411, and the top is provided with a second outlet 412. The spraying assembly 42 comprises a spraying head, which is arranged in the tower body 41 and located between the second inlet 411 and the second outlet 412. The liquid redistributor 43 is located between the spraying head and the second inlet 411. The demister 44 is located between the spraying head and the second outlet 412.

[0081] After the tail gas enters the spray tower 40 from the second inlet 411 of the dust separation device 30, the tail gas can be sprayed with liquid by the spraying head on the upper side of the second inlet 411, so that a small amount of dust, coal tar, low-valence alkanes, and other impurities in the tail gas adhere to the liquid and fall to the bottom of the tower body 41, achieving impurity removal of the tail gas. Moreover, the liquid sprayed by the spraying head will pass through the liquid redistributor 43 before being sprayed into the second inlet 411. The liquid redistributor 43 can disperse the liquid to make the sprayed liquid more evenly distributed in the tower body 41 to contact more tail gas, achieving better impurity removal effect of the tail gas.

[0082] After the tail gas passes through the spraying assembly 42 to remove a small amount of dust, coal tar, low-valence alkanes, and other impurities, the tail gas is relatively light and easy to rise to the second outlet 412 above the second inlet 411. Moreover, the tail gas passes through the demister 44 during the process of rising to the second outlet 412, which is conducive to removing water vapor mixed in the tail gas by the demister 44, further removing impurities from the tail gas, reducing the possibility of condensation of water in the tail gas causing the second outlet 412 to be blocked, and making the tail gas easier to discharge.

[0083] The spraying assembly 42 can include a pipe, the liquid redistributor 43 can be a mesh, and the demister 44 can be a grid demister. The spraying assembly 42, the liquid redistributor 43, and the demister 44 can all be made of stainless steel.

[0084] In some embodiments, the bottom of the tower body 41 is provided with a blowdown port, and a blowdown pump is arranged at the blowdown port. The blowdown pump can drive the flow of sewage to discharge the sewage from the blowdown port.

[0085] In some embodiments, the spraying tower 40 is provided with a water pumping device in communication with the bottom of the tower body 41. The water pumping device can pump the liquid layering the sewage at the bottom of the tower body 41 out and transport it to the spraying assembly 42 for recycling the spraying liquid, and the sewage is not easily pumped out, which is beneficial to water saving.

[0086] In some embodiments, as shown in FIG. 5, the spraying head is multiple and arranged in multiple layers in the vertical direction. Each layer of the spraying head is provided below with a liquid redistributor 43, and the demister 44 is arranged above the multiple layers of the spraying head. The cooperation of the multiple layers of the spraying head and the liquid redistributors 43 can spray the tail gas in the tower body 41 multiple times in the vertical direction, and the impurity removal treatment of the small amount of dust, coal tar and other impurities in the tail gas is more thorough. The demister 44 removes the water vapor in the tail gas after multiple spraying and impurity removal, which improves the impurity removal efficiency of the tail gas.

[0087] In some embodiments of the present application, the polishing degree Ra of the inner wall surface of the treatment device is ≤0.8 μm. The inner wall surface of the treatment device is relatively smooth, which is beneficial to reduce the sticking rate of impurities in the tail gas in the treatment device and to accelerate the flow speed of the tail gas. For example, the polishing degree Ra is 0.4 μm, 0.6 μm, 0.8 μm, etc. Especially for the lithium ion battery positive electrode material, the lithium ion battery positive electrode material is prone to produce impurities in the sintering process. The polishing degree Ra of the inner wall surface of the treatment device is ≤0.8 μm, which is better for the impurity removal effect of the tail gas in the tail gas treatment process.

[0088] In some embodiments, the sintering system 100 further comprises a knocking device for knocking the treatment device, reducing the sticking and accumulation of dust, coal tar and other impurities in the treatment device, and improving the impurity removal efficiency.

[0089] In some embodiments of the present application, as shown in FIG. 1, the tail gas treatment system 20 is further connected in series with an induced draft fan 51. The induced draft fan 51 is used to drive the flow of the tail gas in the tail gas treatment system 20, so that the tail gas discharged from the exhaust port 13 can flow through the multiple-stage treatment device without being easily blocked, the influence of the wind resistance in the tail gas treatment system 20 on the flow of the tail gas is reduced, the reliability of the tail gas treatment is improved, and under the action of the induced draft fan 51, external air is not easily introduced into the tail gas treatment system 20, which is beneficial to protecting the protective gas atmosphere of the rotary sintering furnace 10.

[0090] For example, in some embodiments, the induced draft fan 51 can provide an extraction force to the tail gas discharged from the exhaust port 13 to extract the tail gas from the spray tower 40 after passing through the dust separation device 30 and the spray tower 40, or the induced draft fan 51 can provide a blowing force to the tail gas discharged from the spray tower 40 to blow the tail gas out of the spray tower 40.

[0091] In some embodiments, the tail gas treatment system 20 tail also has an exhaust pump 52 and an exhaust pipe 53 in series, the exhaust pipe 53 extends upward in the vertical direction, and the exhaust pump 52 is used to discharge the tail gas discharged from the multi-stage treatment device to the exhaust pipe 53 to realize high-altitude discharge of the treated tail gas, which is beneficial to protect the environment and protect the health of production personnel and surrounding residents.

[0092] In some embodiments of the present application, as shown in FIGS. 1 and 5, the tail gas treatment system 20 is communicated with the exhaust port 13 through the first connecting pipe 60, and the height of the first connecting pipe 60 in the vertical direction increases first and then decreases from one end to the other end of the first connecting pipe 60. Wherein, the height refers to the height position in the vertical direction, that is, the height position of each part of the first connecting pipe 60 in the vertical direction increases first and then decreases from one end to the other end, or the distance between the point on the center line of the first connecting pipe 60 and the horizontal reference surface increases first and then decreases from one end to the other end. The first connecting pipe 60 is configured in an inverted V shape or an inverted U shape without a horizontal pipe section prone to dust accumulation, reducing dust accumulation in the first connecting pipe 60 to prevent the first connecting pipe 60 from being easily blocked and improve the tail gas treatment efficiency.

[0093] The first connecting pipe 60 can be made of metal or alloy, and the length of the first connecting pipe 60 can be determined according to the relative position of the rotary sintering furnace 10 and the tail gas treatment system 20 during actual use.

[0094] In some embodiments, as shown in FIGS. 1 and 5, the first connecting pipe 60 includes a first pipe section 61 and a second pipe section 62, the first pipe section 61 connects the exhaust port 13 and the second pipe section 62, and the second pipe section 62 connects the first pipe section 61 and the tail gas treatment system 20. The first pipe section 61 and the second pipe section 62 extend downward and away from each other from the connection therebetween, and the included angle α between the first pipe section 61 and the second pipe section 62 is greater than or equal to 60°.

[0095] The exhaust gas discharged from the exhaust port 13 flows to the treatment device through the first pipe section 61 and the second pipe section 62 in sequence, so that the exhaust gas in the first connecting pipe 60 flows first to the obliquely upward direction and then to the obliquely downward direction, and the included angle a between the first pipe section 61 and the second pipe section 62 is greater than or equal to 60°, which is beneficial to reduce the wind resistance of the exhaust gas in the first connecting pipe 60, increase the flow rate of the exhaust gas in the first connecting pipe 60, enable the exhaust gas to quickly flow from the first pipe section 61 to the second pipe section 62, and enable the exhaust gas to flow downward to the treatment device under the action of its own gravity in the second pipe section 62, thereby reducing the residence time of the exhaust gas in the first connecting pipe 60 to reduce the possibility of dust accumulation in the first connecting pipe 60, preventing the first connecting pipe 60 from being easily blocked due to impurity deposition, and improving the exhaust gas treatment efficiency. The included angle a between the first pipe section 61 and the second pipe section 62 can be 60°, 70°, 80°, etc.

[0096] In some embodiments, the exhaust gas treatment system 20 is also connected in series with the induced draft fan 51, and the induced draft fan 51 can be used to draw negative pressure in the first connecting pipe 60 to reduce the pipeline resistance of the first connecting pipe 60 to the exhaust gas, increase the flow rate of the exhaust gas, and reduce the dust accumulation in the first connecting pipe 60.

[0097] In some embodiments, as shown in FIGS. 1 and 5, at least one of the exhaust port 13 and the exhaust gas treatment system 20 is connected to the first connecting pipe 60 through a flexible pipe 80. The flexible pipe 80 can be deformed (e.g., telescopic deformation, bending deformation, etc.) to adapt to the movement (e.g., expansion and contraction deformation of the furnace body 15 of the rotary sintering furnace 10 during switching between cold state and high temperature state, etc.) of at least one of the exhaust port 13 and the exhaust gas treatment system 20 relative to the first connecting pipe 60, so that at least one of the exhaust port 13 and the exhaust gas treatment system 20 is not easily separated from the first connecting pipe 60, the connection is more reliable, the possibility of external air entering the rotary sintering furnace 10 through the connection between at least one of the exhaust port 13 and the exhaust gas treatment system 20 and the first connecting pipe 60 is reduced, which is beneficial to protect the protective gas atmosphere of the rotary sintering furnace 10, and can reduce the leakage of exhaust gas and improve the reliability of the flow of exhaust gas from the rotary sintering furnace 10 to the exhaust gas treatment system 20.

[0098] For example, the exhaust port 13 and the first connecting pipe 60 are rigidly connected, such as welding, riveting, connection through flanges and bolts, etc., and the exhaust gas treatment system 20 is connected to the first connecting pipe 60 through the flexible pipe 80. Alternatively, the exhaust port 13 and the exhaust gas treatment system 20 are both connected to the first connecting pipe 60 through the flexible pipe 80, etc.

[0099] The impurities accumulated in the flexible pipe 80 can be poured into the downstream, such as the first connecting pipe 60 or the exhaust gas treatment system 20, by shaking the flexible pipe 80 by machine or manually, which reduces the accumulation or even blockage of impurities in the flexible pipe 80, improves the flow speed of the exhaust gas, and the flexible pipe 80 is easy to replace. The flexible pipe 80 can be made of metal or alloy.

[0100] In some embodiments of the present application, the first connecting pipe 60 has a polishing degree Ra≤0.8 μm. The inner wall surface of the first connecting pipe 60 is relatively smooth, which is beneficial to reduce the sticking rate of impurities in the tail gas in the first connecting pipe 60 and reduce the possibility of pipe blockage of the first connecting pipe 60 due to impurities sticking to the wall. For example, the polishing degree Ra is 0.4 μm, 0.6 μm, 0.8 μm, etc. Especially for lithium ion battery positive electrode materials, impurities are easily generated during the sintering process of lithium ion battery positive electrode materials, and the polishing degree Ra of the first connecting pipe 60 is ≤0.8 μm, which is better for the impurity removal effect of the tail gas during the tail gas treatment process.

[0101] Since the rotary sintering furnace 10 is a high-temperature sintering environment, the first connecting pipe 60 is in communication with the exhaust port 13 provided in the rotary sintering furnace 10. In some embodiments, the first connecting pipe 60 is provided with a heat preservation structure, such as heat preservation cotton, a heat preservation shell, etc., which is beneficial to avoid condensation of water in the tail gas in the first connecting pipe 60, make the tail gas flow more smooth, and improve the tail gas treatment efficiency. The thickness of the heat preservation cotton can be greater than or equal to 10 mm, for example, the thickness of the heat preservation cotton can be set to 10 mm, 20 mm, 30 mm, 40 mm, 50 mm, etc. The heat preservation shell can be a heat preservation metal shell or a heat preservation plastic shell, for example, the heat preservation shell can be a heat preservation aluminum shell, a polyvinyl chloride (PVC) heat preservation shell, a polyvinylidene fluoride (PVDF) heat preservation shell, etc.

[0102] In some embodiments, the sintering system 100 further comprises a knocking device for knocking the first connecting pipe 60 connecting the tail gas treatment system 20 and the exhaust port 13, reducing the sticking and accumulation of impurities such as dust and coal tar in the first connecting pipe 60, improving the flow rate of the tail gas in the first connecting pipe 60, and improving the impurity removal efficiency.

[0103] In some embodiments of the present application, as shown in FIG. 1, the rotary sintering furnace 10 is provided with a furnace cavity 11, an air inlet 12 and an exhaust port 13 in communication with the furnace cavity 11. The air inlet 12 is used to introduce a protective gas into the furnace cavity 11, and the exhaust port 13 is used to exhaust the tail gas in the furnace cavity 11. The rotary sintering furnace 10 is provided with a feeding port 14 and a discharging port in communication with the furnace cavity 11 at both ends of the axial direction. The feeding port 14 and the exhaust port 13 are arranged at the same end of the axial direction (for example, the front and back directions shown in FIG. 1) of the rotary sintering furnace 10, and the discharging port and the air inlet 12 are arranged at the same end of the axial direction of the rotary sintering furnace 10. The feeding port 14 is used to introduce material into the furnace cavity 11. The material is introduced into the furnace cavity 11 from the feeding port 14 and reacts in the furnace cavity 11 with the rotation of the furnace cavity 11, and then exits the furnace cavity 11 from the discharging port. The protective gas is introduced into the furnace cavity 11 from the air inlet 12, and the impurities carried by the material in the furnace cavity 11 are exhausted from the furnace cavity 11 with the protective gas in the furnace cavity 11 to form the tail gas.

[0104] In the related art, the materials introduced into the furnace cavity can contain a large amount of moisture and oil, which can easily cause serious material adhesion at the inner wall of the feeding end of the rotary sintering furnace, and the material adhesion can easily cause local temperature to be too high, causing the material to be over-sintered, resulting in material loss, and the high temperature can cause the material to react with the furnace body, causing metal to precipitate, resulting in the magnetic content of the product exceeding the standard, affecting the performance of the product.

[0105] In the present application, the feeding port 14 and the exhaust port 13 are arranged at the same end of the axial direction of the rotary sintering furnace 10, and the discharge port and the air inlet 12 are arranged at the same end of the axial direction of the rotary sintering furnace 10. The moisture and oil between the materials at the feeding port 14 can be carried away by the tail gas, and the adhesion of the materials at the inner wall of the rotary sintering furnace 10 can be reduced. The protective gas is introduced from the product discharge end of the rotary sintering furnace 10 and flows to the raw material feeding end, so that the protective gas in the rotary sintering furnace 10 is sufficient, which is beneficial to protect the protective gas atmosphere in the rotary sintering furnace 10, and can ensure that the protective gas atmosphere at the product discharge end of the rotary sintering furnace 10 is more abundant, and the internal environment of the furnace cavity 11 is maintained at a positive pressure environment, avoiding the infiltration of external gas from the component installation gap, which is beneficial to control the oxygen content of the gas atmosphere in the rotary sintering furnace 10, thereby effectively avoiding the oxidation of the sintered product to cause the product to deteriorate, and improving the product quality.

[0106] For example, in some embodiments, as shown in FIG. 1, the air inlet 12 and the discharge port are arranged at the axial rear end of the rotary sintering furnace 10, the feeding port 14 and the exhaust port 13 are arranged at the axial front end of the rotary sintering furnace 10, the material flows from the front end to the rear end of the rotary sintering furnace 10, and the protective gas flows from the rear end to the front end of the rotary sintering furnace 10, so that the impurities in the material can be more fully carried away by the tail gas and the protective gas can fill the furnace cavity 11.

[0107] In some embodiments of the present application, the sintering system 100 further comprises a knocking device for knocking the second connecting pipe 70 connecting the adjacent two treatment devices, reducing the adhesion and accumulation of dust, coal tar and other impurities in the second connecting pipe 70, improving the flow rate of the tail gas between the adjacent two treatment devices, and improving the impurity removal efficiency.

[0108] In some embodiments, the polishing degree Ra of the inner wall surface of the second connecting pipe 70 is ≤0.8 μm. The inner wall surface of the second connecting pipe 70 is relatively smooth, which is beneficial to reduce the adhesion rate of impurities in the tail gas in the second connecting pipe 70 and reduce the possibility of pipe blockage of the second connecting pipe 70 due to impurity adhesion. For example, the polishing degree Ra is 0.4 μm, 0.6 μm, 0.8 μm, etc. Especially for lithium ion battery positive materials, lithium ion battery positive materials are prone to produce impurities during sintering, so that the polishing degree Ra of the inner wall surface of the second connecting pipe 70 is ≤0.8 μm, and the impurity removal effect of the tail gas is better during the tail gas treatment process.

[0109] Other configurations and operations of the sintering system 100 according to embodiments of the present application are known to those of ordinary skill in the art and are not described in detail herein.

[0110] In the description of the present application, it is necessary to point out that, unless explicitly defined and limited otherwise, the terms "mounting", "connection", "linking" should be understood in a broad sense, for example, can be fixed connection, can also be detachable connection, or integral connection; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through intermediate medium, can be internal communication of two elements. For those of ordinary skill in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0111] In the description of the present application, the description of the terms "embodiment", "specific embodiment", "example" and the like means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are contained in at least one embodiment or example of the present application. In the present application, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0112] Although the embodiments of the present application have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, replacements and variations can be made to these embodiments without departing from the principles and purposes of the present application, and the scope of the present application is defined by the claims and their equivalents.

Claims

1. A sintering system, wherein, The sintering system comprises: a rotary sintering furnace provided with an exhaust port for discharging tail gas; a tail gas treatment system in communication with the exhaust port and used for treating the tail gas discharged by the rotary sintering furnace, the tail gas treatment system comprising multiple levels of treatment devices connected in series, wherein at least one of the treatment devices is a dust separation device used for separating dust in the tail gas, and at least one of the treatment devices is a spray tower arranged downstream of the dust separation device and used for washing the tail gas treated by the dust separation device.

2. The sintering system of claim 1, wherein, The dust separation device comprises a settling tank comprising a tank body and multiple baffles arranged in the tank body, the tank body being provided with a first inlet and a first outlet, the baffles extend in a vertical direction or an inclined downward direction, multiple baffles are arranged staggered in a horizontal direction and separate the space in the tank body into multiple subspaces arranged in the horizontal direction, and two subspaces at both ends of the horizontal direction are in communication with the first inlet and the first outlet, respectively, the baffles are provided with communication ports for communicating adjacent two subspaces, and the projections of the communication ports of any adjacent two baffles along the arrangement direction of the baffles do not coincide.

3. The sintering system of claim 2, wherein, The settling tank further comprises a dust discharge port at the bottom, and multiple subspaces are in communication with the dust discharge port.

4. The sintering system of claim 3, wherein, The tank body comprises a flow guide cavity and a dust collection cavity in communication with the flow guide cavity, the flow guide cavity is located above the dust collection cavity, and the cross-sectional area of the dust collection cavity on a horizontal plane gradually decreases in a direction away from the flow guide cavity, and the dust discharge port is in communication with the dust collection cavity.

5. The sintering system of any one of claims 1-4, wherein, The dust separation device comprises a tee pipe, a buffer tank and a cyclone separator, the tee pipe comprises a first pipe body, a second pipe body and a third pipe body, the gas inlet end of the first pipe body is in communication with the exhaust port, the gas outlet end of the first pipe body is in communication with the gas inlet end of the second pipe body and the gas inlet end of the third pipe body, the gas outlet end of the second pipe body is in communication with the cyclone separator, and the gas outlet end of the third pipe body is in communication with the buffer tank, the gas inlet end of the first pipe body is not lower than the gas outlet end of the first pipe body in the vertical direction, the gas outlet end of the third pipe body is lower than the gas inlet end of the third pipe body in the vertical direction, the included angle between the first pipe body and the second pipe body is a, the included angle between the second pipe body and the vertical downward direction is b, and the included angle between the third pipe body and the vertical downward direction is c, wherein a≥90°, b>0°, c≤b.

6. The sintering system of any one of claims 1-5, wherein, The dust separation device comprises a tee pipe, a buffer tank and a cyclone separator, the tee pipe comprises a first pipe body, a second pipe body and a third pipe body, the gas inlet end of the first pipe body is in communication with the exhaust port, the gas outlet end of the first pipe body is in communication with the gas inlet end of the second pipe body and the gas inlet end of the third pipe body, the gas outlet end of the second pipe body is in communication with the cyclone separator, and the gas outlet end of the third pipe body is in communication with the buffer tank, the first pipe body and the third pipe body both extend in the vertical direction, and the second pipe body extends in the horizontal direction.

7. The sintering system according to claim 5 or 6, wherein The top of the buffer tank is provided with a first opening and the bottom is provided with a second opening, the first opening is communicated with the tee pipe, and the second opening is used for discharging sediment and is provided with an on-off valve; The top of the cyclone separator is provided with a third opening and a fourth opening and the bottom is provided with a fifth opening, the third opening is communicated with the tee pipe, the fourth opening is communicated with the downstream treatment device, and the fifth opening is used for discharging sediment and is provided with an on-off valve.

8. The sintering system of any one of claims 1-7, wherein, The spray tower comprises a tower body, a spraying assembly, a liquid redistributor and a demister, the side of the tower body is provided with a second inlet and the top is provided with a second outlet, the spraying assembly comprises a spraying head, the spraying head is arranged in the tower body and located between the second inlet and the second outlet, the liquid redistributor is located between the spraying head and the second inlet, and the demister is located between the spraying head and the second outlet.

9. The sintering system of claim 8, wherein, The spraying head is multiple and arranged in multiple layers in the vertical direction, and the liquid redistributor is arranged below each layer of the spraying head, and the demister is arranged above the multiple layers of the spraying head.

10. The sintering system of any one of claims 1-9, wherein, The tail gas treatment system is further connected with an induced draft fan, and the induced draft fan is used to drive the tail gas to flow in the tail gas treatment system.

11. The sintering system of any one of claims 1-10, wherein, The tail gas treatment system is communicated with the exhaust port through a first connecting pipe, and the height of the first connecting pipe in the vertical direction increases first and then decreases from one end of the first connecting pipe to the other end.

12. The sintering system of claim 11, wherein, The first connecting pipe comprises a first pipe section and a second pipe section, the first pipe section connects the exhaust port and the second pipe section, the second pipe section connects the first pipe section and the tail gas treatment system, the first pipe section and the second pipe section extend downward and away from each other from the connection position, and the included angle between the first pipe section and the second pipe section is greater than or equal to 60°.

13. The sintering system of any one of claims 11-12, wherein, At least one of the exhaust port and the tail gas treatment system is connected with the first connecting pipe through a flexible pipe.

14. The sintering system of any one of claims 11-13, wherein, The polishing degree Ra of the first connecting pipe is less than or equal to 0.8 μm; and / or, the polishing degree Ra of the inner wall surface of the treatment device is less than or equal to 0.8 μm.

15. The sintering system of any one of claims 1-14, wherein, The rotary sintering furnace is provided with a furnace cavity, an air inlet and an exhaust port communicated with the furnace cavity, the air inlet is used to introduce protective gas into the furnace cavity, and the exhaust port is used to discharge tail gas in the furnace cavity; the rotary sintering furnace is provided with a feeding port and a discharging port communicated with the furnace cavity at two ends in the axial direction, the feeding port and the exhaust port are arranged at the same end in the axial direction of the rotary sintering furnace, and the discharging port and the air inlet are arranged at the same end in the axial direction of the rotary sintering furnace.

16. The sintering system of any one of claims 1-15, wherein, The knocking device is further arranged to knock the treatment device; and / or, the knocking device is arranged to knock the first connecting pipe connecting the tail gas treatment system and the exhaust port; and / or, the knocking device is arranged to knock the second connecting pipe connecting adjacent two treatment devices.

17. The sintering system of any one of claims 11-14, wherein, The first connecting pipe and / or the dust separation device is externally provided with a heat preservation structure.

18. The sintering system of any one of claims 1-17, wherein, The sintering system is applied to the preparation of new energy materials, including lithium ion battery positive materials, and the lithium ion battery positive materials include one of lithium iron phosphate, lithium cobaltate and lithium nickel cobalt manganese oxide.

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