Sintering system

Abstract

The utility model discloses a sintering system which comprises a rotary sintering furnace provided with an exhaust port used for exhausting tail gas; the tail gas treatment system communicates with the exhaust port and is used for treating tail gas exhausted by the rotary sintering furnace, the tail gas treatment system comprises multiple stages of treatment devices which are connected in series, at least one stage of treatment device is a dust separation device, and the dust separation device is used for separating dust in the tail gas; at least one stage of treatment device is a spray tower, and the spray tower is arranged at the downstream of the dust separation device and is used for washing the tail gas treated by the dust separation device. According to the sintering system disclosed by the embodiment of the utility model, impurities such as dust, coal tar and water vapor in the tail gas are removed through multi-stage tail gas treatment, so that the impurity removal efficiency is improved, and the emission hazard of the tail gas is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of sintering, and more specifically, to a sintering system. Background Art

[0002] 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 rotary kiln equipment. Therefore, the rotary kiln equipment needs to be equipped with a gas introduction structure and an exhaust mechanism, and the exhaust gas discharged through the exhaust structure needs to be purified, otherwise it is easy to seriously harm the environment. Utility Model Content

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, one purpose of the utility model is to provide a sintering system, which can pass protective gas into a rotary sintering furnace and discharge tail gas, and can effectively purify the tail gas to reduce the harm of tail gas emissions to the environment.

[0004] According to the sintering system of the embodiment of the utility model, it includes: a rotary sintering furnace, which is provided with an exhaust port for discharging exhaust gas; an exhaust gas treatment system, which is connected with the exhaust port and is used to treat the exhaust gas discharged from the rotary sintering furnace, and the exhaust gas treatment system includes a multi-stage treatment device connected in series, wherein at least one stage of the treatment device is a dust separation device, and the dust separation device is used to separate dust in the exhaust gas; at least one stage of the treatment device is a spray tower, which is arranged downstream of the dust separation device and is used to wash the exhaust gas treated by the dust separation device.

[0005] According to the sintering system of the embodiment of the utility model, by performing multi-stage exhaust gas treatment and including a dust separation device and a spray tower arranged downstream of the dust separation device, impurities such as dust, coal tar, low-valent alkanes, and water vapor in the exhaust gas are removed, the impurity removal efficiency is improved, the exhaust gas is removed more thoroughly, and the exhaust gas emission hazards are reduced.

[0006] In addition, the sintering system according to the above embodiment of the utility model may also have the following additional technical features:

[0007] According to some embodiments of the utility model, the dust separation device includes a sedimentation tank, which includes 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 spaced apart and arranged in an alternating manner in the horizontal direction and divide the space inside the tank body into a plurality of subspaces arranged along the horizontal direction, the two subspaces located at the two ends of the horizontal direction are respectively connected with the first inlet and the first outlet, the baffle is provided with a connecting port connecting two adjacent subspaces, and the projections of the connecting ports of any two adjacent baffles along the arrangement direction of the baffles do not overlap.

[0008] According to some embodiments of the present invention, the sedimentation tank further includes a dust exhaust port at the bottom, and the plurality of subspaces are all connected to the dust exhaust port.

[0009] According to some embodiments of the utility model, the tank body includes a guide cavity and a dust collecting cavity connected to the guide cavity, the guide cavity is located above the dust collecting cavity, and the cross-sectional area of ​​the dust collecting cavity on the horizontal plane gradually decreases in the direction away from the guide cavity, and the dust exhaust port is connected to the dust collecting cavity.

[0010] According to some embodiments of the utility model, the dust separation device includes a three-way pipe, a buffer tank and a cyclone separator, the three-way pipe includes a first tube body, a second tube body and a third tube body, the air inlet end of the first tube body is connected to the exhaust port, the air outlet end of the first tube body is connected to the air inlet end of the second tube body and the air inlet end of the third tube body, the air outlet end of the second tube body is connected to the cyclone separator, and the air outlet end of the third tube body is connected to the buffer tank, the air inlet end of the first tube body is not lower than the air outlet end of the first tube body in the vertical direction, the air outlet end of the third tube body is lower than the air inlet end of the third tube body in the vertical direction, the angle between the first tube body and the second tube body is a, the angle between the second tube body and the vertical downward direction is b, and the angle between the third tube body and the vertical downward direction is c, wherein a≥90°, b>0°, and c≤b.

[0011] According to some embodiments of the utility model, the dust separation device includes a three-way pipe, a buffer tank and a cyclone separator, the three-way pipe includes a first tube body, a second tube body and a third tube body, the air inlet end of the first tube body is connected to the exhaust port, the air outlet end of the first tube body is connected to the air inlet end of the second tube body and the air inlet end of the third tube body, the air outlet end of the second tube body is connected to the cyclone separator, the air outlet end of the third tube body is connected to the buffer tank, the first tube body and the third tube body both extend in the vertical direction, and the second tube body extends in the horizontal direction.

[0012] According to some embodiments of the utility model, the buffer tank is provided with a first opening on the top and a second opening on the bottom, the first opening is connected to the three-way pipe, the second opening is used to discharge sediment and is provided with an on-off valve; the cyclone separator is provided with a third opening and a fourth opening on the top and a fifth opening on the bottom, the third opening is connected to the three-way pipe, the fourth opening is connected to the downstream processing device, and the fifth opening is used to discharge sediment and is provided with an on-off valve.

[0013] According to some embodiments of the utility model, the spray tower includes 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 includes 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.

[0014] According to some embodiments of the present invention, there are multiple spray heads arranged in multiple layers along the vertical direction, the liquid redistributor is arranged below each layer of the spray heads, and the demister is arranged above the multiple layers of the spray heads.

[0015] According to some embodiments of the present utility model, the exhaust gas treatment system is further connected in series with an induced draft fan, and the induced draft fan is used to drive the exhaust gas to flow in the exhaust gas treatment system.

[0016] According to some embodiments of the present utility model, the exhaust gas treatment system is connected to the exhaust port through a first connecting pipe, and the height of the first connecting pipe in the vertical direction first increases and then decreases from one end to the other end of the first connecting pipe.

[0017] According to some embodiments of the present utility model, the first connecting pipe includes 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 exhaust gas treatment system, the first pipe section and the second pipe section extend downward and away from each other from their connection, and the angle between the first pipe section and the second pipe section is greater than or equal to 60°.

[0018] According to some embodiments of the present invention, at least one of the exhaust port and the exhaust gas treatment system is connected to the first connecting pipe via a flexible pipe.

[0019] According to some embodiments of the present invention, 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 processing device is less than or equal to 0.8 μm.

[0020] According to some embodiments of the utility model, the rotary sintering furnace is provided with a furnace cavity and an air inlet and an exhaust port connected to the furnace cavity, the air inlet is used to introduce protective gas into the furnace cavity, and the exhaust port is used to discharge the exhaust gas in the furnace cavity; the two axial ends of the rotary sintering furnace are respectively provided with a feed port and a discharge port connected to the furnace cavity, the feed port and the exhaust port are arranged at the same axial end of the rotary sintering furnace, and the discharge port and the air inlet are arranged at the same axial end of the rotary sintering furnace.

[0021] According to some embodiments of the utility model, the sintering system also includes a knocking device, which is used to knock the processing device; and / or, the knocking device is used to knock the first connecting pipe connecting the exhaust gas treatment system and the exhaust port; and / or, the knocking device is used to knock the second connecting pipe connecting two adjacent processing devices.

[0022] According to some embodiments of the present invention, a heat preservation structure is provided outside the first connecting pipe and / or the dust separation device.

[0023] According to some embodiments of the utility model, the sintering system is applied to the preparation of new energy materials to dynamically sinter 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 cobalt oxide, and lithium nickel cobalt manganese oxide.

[0024] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0026] Figure 1 is a schematic structural diagram of a sintering system according to an embodiment of the utility model;

[0027] Figure 2 This is a top view of a settling tank according to an embodiment of the utility model;

[0028] Figure 3 It is a cross-sectional view of a settling tank according to an embodiment of the utility model, wherein a plurality of baffles are arranged in a staggered manner at intervals in the horizontal direction;

[0029] Figure 4 is a cross-sectional view of a settling tank of a comparative scheme, wherein a plurality of baffles are arranged in a staggered manner at intervals in the vertical direction;

[0030] Figure 5It is a partial structural schematic diagram of a sintering system according to an embodiment of the utility model.

[0031] Reference numerals:

[0032] Sintering system 100;

[0033] Rotary sintering furnace 10; furnace chamber 11; air inlet 12; exhaust port 13; feed port 14; furnace body 15;

[0034] Exhaust gas treatment system 20;

[0035] Dust separation device 30; sedimentation tank 31; tank body 32; first inlet 321; first outlet 322; dust discharge port 323; guide chamber 324; dust collection chamber 325; baffle 33; communication port 331; subspace 34;

[0036] Tee pipe 35; first tube body 351; second tube body 352; third tube body 353; buffer tank 36; first opening 361; second opening 362; cyclone separator 37; third opening 371; fourth opening 372; fifth opening 373; blocking member 374;

[0037] Spray tower 40; tower body 41; second inlet 411; second outlet 412; spray assembly 42; liquid redistributor 43; demister 44;

[0038] induced draft fan 51; exhaust pump 52; exhaust pipe 53;

[0039] A first connecting pipe 60 ; a first pipe section 61 ; a second pipe section 62 ; a second connecting pipe 70 ; a flexible pipe 80 ; and an on-off valve 90 . DETAILED DESCRIPTION

[0040] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0041] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0042] In the description of the present invention, "first feature" and "second feature" may include one or more such features, "plurality" means two or more, the first feature "above" or "below" the second feature may include the first and second features being in direct contact, or may include the first and second features not being in direct contact but being in contact through another feature between them, the first feature "above", "above" and "above" the second feature may include the first feature being directly above and diagonally above the second feature, or may simply mean that the first feature is at a higher level than the second feature.

[0043] A sintering system 100 according to an embodiment of the present invention will be described below with reference to the accompanying drawings.

[0044] Reference Figure 1-Figure 5 As shown, the sintering system 100 according to the embodiment of the present invention may include: a rotary sintering furnace 10 and a tail gas treatment system 20 .

[0045] Specifically, the rotary sintering furnace 10 is provided with an exhaust port 13 for exhausting exhaust gas. The exhaust gas treatment system 20 is connected to the exhaust port 13 and is used to treat the exhaust gas discharged from the rotary sintering furnace 10. The exhaust gas treatment system 20 includes a multi-stage treatment device connected in series. Among them, at least one stage of the treatment device is a dust separation device 30, which is used to separate dust particles in the exhaust gas; at least one stage of the treatment device is a spray tower 40, which is located downstream of the dust separation device 30 and is used to wash the exhaust gas treated by the dust separation device 30.

[0046] The rotary sintering furnace 10 is used to perform sintering and other operations on materials. A protective gas such as an inert gas (such as nitrogen) can be introduced into the rotary sintering furnace 10 to ensure a protective gas atmosphere inside the rotary sintering furnace 10, so as to avoid excessive oxygen content in the rotary sintering furnace 10 affecting the calcination of materials such as lithium iron phosphate. For example, excessive oxygen content will cause more lithium iron phosphate to be oxidized into by-products such as trivalent iron salts. Sintering the material under a protective gas atmosphere is beneficial to improving product quality.

[0047] Production dust will be generated during the process of feeding raw materials and the process of materials moving and sintering in the rotary sintering furnace 10. At the same time, due to the moisture and impurities carried by the iron phosphate raw materials prepared in the previous process, water vapor, coal tar and low-valent alkanes will be generated during the initial sintering. These production dust, water vapor, coal tar and low-valent alkanes will be discharged with the protective gas inside the rotary sintering furnace 10 to form tail gas. 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 that the protective gas is continuously introduced into the rotary sintering furnace 10, which is conducive to maintaining the protective gas atmosphere of the materials in the rotary sintering furnace 10, and preventing the water vapor, coal tar and low-valent alkanes mixed in the gas from affecting the sintering of the materials and reducing the product quality.

[0048] The tail gas discharged from the exhaust port 13 is purified by the tail gas treatment system 20 to remove impurities such as dust, coal tar, and water vapor in the tail gas, so as to avoid serious harm to the environment caused by direct discharge of tail gas. Specifically, a large amount of dust contained in the tail gas can be separated by the dust separation device 30, greatly reducing the dust content in the tail gas, and realizing the 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 a small amount of dust, coal tar, low-valent alkanes, water vapor and other impurities in the tail gas, and further remove impurities from the tail gas, so that the tail gas purification is more thorough, more conducive to discharge, and more environmentally friendly.

[0049] The tail gas is treated in multiple stages (may be two, three or more stages) by the dust separation device 30 and the spray tower 40, and the spray tower 40 is arranged downstream of the dust separation device 30 to facilitate the graded treatment of the tail gas, that is, the tail gas is subjected to dust removal treatment and then washing treatment, so as to avoid excessive dust in the tail gas resulting in low washing efficiency, and to avoid excessively high dust humidity resulting in low dust removal efficiency, thereby improving the impurity removal efficiency and removing impurities from the tail gas more thoroughly.

[0050] There may be multiple dust separation devices 30, which is conducive to multiple dust removal treatments of the tail gas, and there may be multiple spray towers 40, which is conducive to multiple washing of the tail gas, realizing more-stage treatment of the tail gas and 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 may also include more other treatment devices to treat the tail gas.

[0051] According to the sintering system 100 of the embodiment of the utility model, by performing multi-stage exhaust gas treatment and including a dust separation device 30 and a spray tower 40 arranged downstream of the dust separation device 30, impurities such as dust, coal tar, low-valent alkanes, and water vapor in the exhaust gas are removed, the impurity removal efficiency is improved, the exhaust gas is removed more thoroughly, and the exhaust gas emission hazards are reduced.

[0052] In some embodiments of the utility model, the sintering system 100 is applied to the preparation of new energy materials to dynamically sinter the raw materials. 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 cobalt oxide, and lithium nickel cobalt manganese oxide. New energy materials such as lithium-ion battery positive electrode materials are prone to produce impurities such as production dust, water vapor, coal tar, and low-valent alkanes during the sintering process. The sintering system 100 of the utility model is used to sinter the lithium-ion battery positive electrode materials, and the protective gas can be continuously introduced into the rotary sintering furnace 10 to use the protective gas to take away impurities in the raw materials, reduce the adverse effects of impurities on the sintering of materials, and help improve product quality. The tail gas in the rotary sintering furnace 10 can be discharged to the outside after impurity treatment.

[0053] In some embodiments of the present invention, Figure 1-Figure 3 As shown, the dust separation device 30 includes a sedimentation tank 31, and the sedimentation tank 31 includes a tank body 32 and a plurality of baffles 33 arranged in the tank body 32. The tank body 32 is provided with a first inlet 321 and a first outlet 322. The baffles 33 are arranged in a vertical direction (e.g. Figure 3 The baffles 33 extend in the horizontal direction (eg, in the vertical direction) or in the oblique downward direction (eg, at 5°, 10°, 15°, 20°, 25°, 30°, etc. to the vertical downward direction). Figure 3 The first and second sub-spaces 321 and 322 are spaced apart and arranged in an interlaced manner (in the front-to-back direction as shown) and the space inside the tank body 32 is divided into a plurality of sub-spaces 34 arranged in the horizontal direction. The two sub-spaces 34 located at the two ends in the horizontal direction are connected to the first inlet 321 and the first outlet 322 respectively.

[0054] The baffle 33 is provided with a connecting port 331 connecting two adjacent subspaces 34, and the projections of the connecting ports 331 of any two adjacent baffles 33 along the arrangement direction of the baffles 33 do not overlap. Specifically, the edges of the baffle 33 are all connected to the inner wall of the tank body 32, and the connecting port 331 is formed by directly opening a hole in the baffle 33, or at least part of the edge of the baffle 33 is not connected to the inner wall of the tank body 32, and the connecting port 331 is formed by the edge of the baffle 33 and the inner wall of the tank body 32. The multiple baffles 33 are arranged in a staggered manner at intervals in the horizontal direction, that is, the projections of the multiple baffles 33 in the horizontal direction have overlapping parts and non-overlapping parts, and the projections of the connecting ports 331 of any two adjacent baffles 33 in the horizontal direction do not overlap.

[0055] 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. In 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 settles under the action of gravity, and the exhaust gas is blocked by the baffle 33 and cannot flow directly from the first inlet 321 along the line connecting the first inlet 321 and the first outlet 322 to the first outlet 322. The exhaust gas hits the baffle 33 during the flow, making it easier for the dust to settle, which is beneficial to improving the dust removal efficiency of the exhaust gas.

[0056] The exhaust gas is blocked by the baffle 33 and can only bypass the baffle 33 and enter the adjacent subspace 34 through the connecting port 331, so that the exhaust gas flows from the first inlet 321 along the curve (for example Figure 3 The tail gas (as shown by the arrowed curve) flows through the multiple sub-spaces 34 to the first outlet 322 in sequence, extending the flow path of the tail gas, allowing more dust to settle during the flow of the tail gas, and improving the dust removal efficiency of the tail gas.

[0057] It is worth noting that Figure 2 As shown, there can be multiple first inlets 321, and when one of the first inlets 321 is working, the other first inlets 321 are in a closed state, so as to avoid the blockage of one first inlet 321 so that the exhaust gas discharged from the exhaust port 13 cannot enter the settling tank 31, thereby reducing the blockage probability of the dust separation device 30 and improving the dust removal reliability. The settling tank 31 can also be provided with an inspection port for cleaning the wall-adhering materials inside the settling tank 31 and other maintenance and repair work. The inspection port can be multiple (two, three or more), which is preferably opened at the top of the settling tank 31 and reasonably distributed according to the actual shape and size of the settling tank 31, so as to improve the inspection and cleaning effect and operation efficiency.

[0058] The first inlet 321 and the first outlet 322 are arranged in the horizontal direction, and the projections of the connecting openings 331 of any two adjacent baffles 33 in the horizontal direction do not overlap, which is beneficial to extend the flow path of the exhaust gas to improve the blocking effect of the multiple baffles 33 on the exhaust gas and improve the settling rate of dust in the exhaust gas.

[0059] In some embodiments, the sedimentation tank 31 also includes a dust exhaust port 323 at the bottom, and multiple sub-spaces 34 are connected to the dust exhaust port 323, which is conducive to allowing the dust settled in the multiple sub-spaces 34 to settle to the dust exhaust port 323 at the bottom, so as to discharge the dust, reduce the possibility of blockage of the sedimentation tank 31, such as blockage of the connecting port 331, and improve the reliability of exhaust gas treatment at the sedimentation tank 31.

[0060] In some embodiments, the tank body 32 includes a flow guiding cavity 324 and a dust collecting cavity 325 connected to the flow guiding cavity 324. The flow guiding cavity 324 is located above the dust collecting cavity 325, and the cross section of the dust collecting cavity 325 on the horizontal plane gradually decreases in the direction away from the flow guiding cavity 324, and the dust discharge port 323 is connected to the dust collecting cavity 325. The dust collecting cavity 325 is configured to decrease downward, that is, to form a conical structure, and the side wall of the dust collecting cavity 325 can form an upward guiding effect on the airflow, so that the airflow tends to flow around between the multiple sub-spaces 34, and at the same time is conducive to the centralized collection of dust.

[0061] The scheme of arranging multiple subspaces 34 in the horizontal direction is conducive to making the bottoms of the multiple subspaces 34 directly connected to the dust exhaust port 323 respectively, so that the dust can be directly settled in the dust exhaust port 323, instead of continuing to move with the airflow in a longer flow path or sliding along the surface of the baffle 33 and transferring between multiple baffles 33, and then repeatedly mixing and separating with the airflow, thereby improving the dust removal efficiency of the exhaust gas, facilitating the rapid sedimentation and removal of the dust, and at the same time avoiding the problem of accumulated dust affecting the rate and effect of dust sedimentation and separation of the subsequent exhaust gas as the working time increases, and the problem of dust accumulation in the baffle 33 causing cleaning difficulty.

[0062] For example, Figure 4 The scheme shown is used as a comparative example, in which the baffles 33 extend obliquely downward in the horizontal direction, and the multiple baffles 33 are arranged in a staggered manner at intervals in the vertical direction and divide the space inside the tank body 32 into multiple subspaces 34 arranged in the vertical direction, and the two subspaces 34 located at both ends in the vertical direction are respectively connected to 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 multiple baffles 33 are arranged in a staggered manner at intervals in the vertical direction, that is, the projections of the multiple baffles 33 in the vertical direction have overlapping parts and non-overlapping parts, and the projections of the communication ports 331 of any two adjacent baffles 33 in the vertical direction do not overlap.

[0063] In this comparative scheme, although the setting of multiple baffles 33 can also extend the flow path of the exhaust gas to improve the exhaust gas blocking effect, the dust settled by gravity needs to continue to move along the winding airflow path to reach and be collected at the bottom of the tank 32, which greatly affects the dust separation and collection efficiency, and the dust will be deposited on the inclined baffles 33, which will make cleaning difficult after long-term accumulation. At the same time, the accumulated dust will slide downward along the surface of the baffle 33, and then detach from the baffle 33 and remix with the airflow, resulting in the need for repeated sedimentation, or the accumulated dust will fall to the baffle 33 below and cause dust due to the impact force, thereby worsening the dust separation effect.

[0064] The settling tank 31 may be one, two or more, which is conducive to realizing multi-stage treatment of tail gas. For example, in some embodiments, there are two settling tanks 31, wherein the baffle 33 in one settling tank 31 extends downwardly along the horizontal direction, and the baffle 33 in the other settling tank 31 extends along the vertical direction.

[0065] In some embodiments, a stop valve 90 is provided at the dust outlet 323 at the bottom of the settling tank 31, and the opening degree of the dust outlet 323 can be controlled by the stop valve 90, so as to facilitate opening the dust outlet 323 to discharge the dust accumulated in the settling tank 31, or control the dust outlet 323 to be not fully opened to perform dust settling and discharge functions at the same time, or close the dust outlet 323 to prevent external gas from entering the settling tank 31 and then entering the exhaust port 13, which is conducive to ensuring the protective gas atmosphere in the rotary sintering furnace 10. In the present application, there may be one or more on-off valves 90, and each on-off valve 90 may be a butterfly valve, a ball valve, etc.

[0066] The sedimentation tank 31 is not prone to clogging, and the sedimentation tank 31 is only provided with one outlet to discharge the sediment. Since the sediment discharge outlet of the sedimentation tank 31 is also the contact exposure outlet of the exhaust gas treatment system 20 with the outside world, that is, while achieving the efficient dust separation effect, it is beneficial to reduce the exposure outlet of the exhaust gas with the outside air, reduce the air entering the sedimentation tank 31 from the air-breaking port and then entering the rotary sintering furnace 10 from the exhaust port 13, reduce the oxygen content in the exhaust gas treatment system 20 and the rotary sintering furnace 10, prevent the oxygen content in the exhaust gas treatment system 20 and the rotary sintering furnace 10 from exceeding the standard, and help control the oxygen content of the sintering product and improve the product quality.

[0067] In some embodiments of the present invention, Figure 5 As shown, 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 tube body 351, a second tube body 352 and a third tube body 353. The air inlet end of the first tube body 351 is connected to the exhaust port 13, the air outlet end of the first tube body 351 is connected to the air inlet end of the second tube body 352 and the air inlet end of the third tube body 353, the air outlet end of the second tube body 352 is connected to the cyclone separator 37, and the air outlet end of the third tube body 353 is connected to the buffer tank 36. The air inlet end of the first tube body 351 is not lower than the air outlet end of the first tube body 351 in the vertical direction, the air outlet end of the third tube body 353 is lower than the air inlet end of the third tube body 353 in the vertical direction, the angle between the first tube body 351 and the second tube body 352 is a, the angle between the second tube body 352 and the vertical downward direction is b, and the angle between the third tube body 353 and the vertical downward direction is c. Wherein, a≥90°, b>0°, c≤b.

[0068] The exhaust gas discharged from the exhaust port 13 first enters the first tube body 351, so that the exhaust gas discharged into the first tube body 351 can at least be discharged to the outlet end of the first tube body 351 under the action of gravity to be discharged to the inlet end of the second tube body 352 and the inlet end of the third tube body 353, thereby reducing the possibility of backflow of the exhaust gas in the first tube body 351 and making the exhaust gas emission more reliable.

[0069] The exhaust gas discharged from the exhaust port 13 enters the three-way pipe 35 and is then discharged to the buffer tank 36 and the cyclone separator 37, so that the larger dust particles in the exhaust gas move downward due to their own gravity when passing through the buffer tank 36 and settle in the buffer tank 36, which is conducive to allowing more large dust particles in the exhaust gas to enter the buffer tank 36 through the third tube body 353, thereby realizing dust removal treatment of the exhaust gas.

[0070] It is also helpful to reduce the wind resistance of the exhaust gas from the first tube body 351 to the second tube body 352, so that the exhaust gas is discharged into the cyclone separator 37 faster, which is helpful 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 undergoes centrifugal motion in the cyclone separator 37 and is thrown toward the peripheral wall of the cyclone separator 37 and then settles to the bottom of the cyclone separator 37, thereby achieving dust removal treatment of the exhaust gas. That is, the exhaust gas is subjected to multi-stage treatment in the dust separation device 30, which is particularly helpful to remove large dust particles and small dust particles in the exhaust gas, and the dust removal efficiency is higher.

[0071] It is worth noting that the exhaust gas passing through the third tube body 353 can be dust-removed through the buffer tank 36 without the exhaust gas entering the buffer tank 36. That is, when the exhaust gas passes through the third tube body 353, the large particles of dust mixed in the exhaust gas move downward due to their own gravity and enter and are collected in the buffer tank 36, while the gas can directly pass through the second tube body 352 into the cyclone separator 37, thereby shortening the dust removal time of the exhaust gas in the buffer tank 36 and improving the dust removal efficiency.

[0072] The exhaust port 13, the buffer tank 36 and the cyclone separator 37 are connected by the three-way pipe 35. Only one opening is required in the buffer tank 36 to connect the exhaust port 13 and the cyclone separator 37, without having to provide multiple openings in the buffer tank 36 to connect the exhaust port 13 and the cyclone separator 37 respectively. The number of openings of the buffer tank 36 is reduced, thereby reducing the connection area between the buffer tank 36 and the outside world, which is beneficial to ensuring the protective gas atmosphere in the buffer tank 36 and thus ensuring the protective gas atmosphere in the rotary sintering furnace 10.

[0073] It should be noted that only when the air inlet end of the second tube body 352 is located directly below the air outlet end in the vertical direction, the angle b between the second tube body 352 and the vertical direction can be equal to 0°, that is, the exhaust gas at the second tube body 352 can flow vertically upward from the air inlet end to the air outlet end to enter the cyclone separator 37 instead of flowing vertically downward from the air inlet end to the air outlet end, so that more dust in the exhaust gas enters the buffer tank 36 instead of the cyclone separator 37, which is beneficial to improve the exhaust gas treatment efficiency of the buffer tank 36 and the cyclone separator 37.

[0074] It is understandable that b is not equal to 0°, that is, the second tube body 352 will not extend downward in the vertical direction, and c≤b, that is, the third tube body 353 can be closer to the vertical downward direction than the second tube body 352, so that the exhaust gas discharged from the first tube body 351 is discharged more to the third tube body 353, which is conducive to the sedimentation of large particles of dust in the exhaust gas in the buffer tank and improves the exhaust gas treatment efficiency. For example, in some embodiments, a is 180°, b is 90°, and c is 0°, that is, the air inlet end of the first tube body 351 extends toward the air outlet end in the horizontal direction, the air inlet end of the second tube body 352 extends toward the air outlet end in the horizontal direction, and the air inlet end of the third tube body 353 extends downward toward the air outlet in the vertical direction. In some embodiments, a is 90°, b is 45°, and c is 30°, that is, the air inlet end of the first tube body 351 extends obliquely downward toward the air outlet end, the air inlet end of the second tube body 352 extends obliquely downward toward the air outlet end, and the air inlet end of the third tube body 353 extends obliquely downward toward the air outlet end, and the third tube body 353 is closer to the vertical downward direction than the second tube body 352. This is beneficial to reduce the wind resistance of exhaust gas emission and discharge more large particles of dust in the exhaust gas to the settling tank 36.

[0075] In some embodiments, Figure 5 As shown, 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 tube body 351, a second tube body 352 and a third tube body 353. The air inlet end of the first tube body 351 is connected to the exhaust port 13, the air outlet end of the first tube body 351 is connected to the air inlet end of the second tube body 352 and the air inlet end of the third tube body 353, the air outlet end of the second tube body 352 is connected to the cyclone separator 37, and the air outlet end of the third tube body 353 is connected to the buffer tank 36. The first tube body 351 and the third tube body 353 both extend in the vertical direction, and the second tube body 352 extends in the horizontal direction.

[0076] The exhaust gas discharged from the exhaust port 13 first enters the first tube body 351, so that the exhaust gas is more discharged to the second tube body 352 in the first tube body 351 along the vertical direction and discharged to the buffer tank 36 in the second tube body 352 along the vertical direction, and the larger dust particles in the exhaust gas are more easily discharged into the buffer tank 36 in the vertical direction under the action of their own gravity, which is conducive to removing more dust in the exhaust gas, such as large dust particles. The exhaust gas after dust removal in the buffer tank 36 and the exhaust gas carrying smaller dust particles discharged from the first tube body 351 can be discharged to the second tube body 352, and discharged to the cyclone separator 37 in the second tube body 352 in the horizontal direction, so that the exhaust gas can be further dust-removed by the cyclone separator 37, which is conducive to realizing the graded treatment of the exhaust gas in the dust separation device 30 and improving the dust removal efficiency.

[0077] In some embodiments, Figure 5 As shown, 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, the second opening 362 is used to discharge sediments 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 the downstream processing device, and the fifth opening 373 is used to discharge sediments and is provided with an on-off valve 90.

[0078] 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 dust particles in the exhaust gas settle from the top of the buffer tank 36 to the bottom of the buffer tank 36 under the action of their own gravity, extending the sedimentation path of the large dust particles to improve the dust removal efficiency of the exhaust gas. The large dust particles settled to the bottom of the buffer tank 36 are accumulated together to form sediments, and the sediments 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 on-off valve 90 can control the opening degree of the second opening 362, so as to facilitate opening the second opening 362 to discharge the sediment in the buffer tank 36, or control the second opening 362 to open a part to perform dust sedimentation and discharge functions at the same time, or close the second opening 362 to prevent external gas from entering the buffer tank 36 through the second opening 362, thereby ensuring the protective gas atmosphere in the rotary sintering furnace 10.

[0079] The tail gas in the three-way pipe 35 can be discharged from the top of the cyclone separator 37 into 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 settles to the bottom of the cyclone separator 37 under its own gravity and the centrifugal action of the cyclone separator 37, extending the dust settling path to improve the dust removal efficiency of the tail gas. The dust settled to the bottom of the cyclone separator 37 accumulates together to form 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 on-off valve 90 can control the opening degree of the fifth opening 373, so as to open the fifth opening 373 to discharge the sediment in the cyclone separator 37, or control the fifth opening 373 to open a part to perform the dust centrifugal sedimentation and discharge functions at the same time, or close the fifth opening 373 to prevent the outside gas from entering the cyclone separator 37 through the fifth opening 373, thereby ensuring the protective gas atmosphere in the rotary sintering furnace 10.

[0080] After centrifugal sedimentation in the cyclone separator 37, more dust is removed from the exhaust gas, making the exhaust gas lighter and easier to rise to the top of the cyclone separator 37, and discharged to the downstream processing device such as the spray tower 40 through the fourth opening 372 at the top of the cyclone separator 37 for the next level of impurity removal, thereby realizing the purification of the exhaust gas by multiple-stage processing devices in sequence.

[0081] The exhaust gas can enter the cyclone separator 37 tangentially along the third opening 371 to increase the tangential acceleration of the exhaust gas, so that the exhaust gas is accelerated to perform centrifugal motion in the cyclone separator 37, thereby improving the centrifugal dust removal effect of the exhaust gas. Figure 5 As shown, the fourth opening 372 is located on the upper side of the third opening 371, and a blocking member 374 is provided between the third opening 371 and the fourth opening 372, so that the exhaust gas discharged into the cyclone separator 37 through the third opening 371 is not easily discharged directly from the fourth opening 372, thereby improving the reliability of exhaust gas dust removal.

[0082] The buffer tank 36 can be a hollow tank, that is, there is no structure inside the buffer tank 36, which is conducive to the dust in the exhaust gas settling to the bottom of the buffer tank 36. The bottom of the buffer tank 36 can be designed as an inverted cone to facilitate the discharge of sediment from the bottom cone. The specific size of the buffer tank 36 and the cyclone separator 37 can be determined according to the exhaust gas flow rate, the dust content in the exhaust gas, the dust particle size and other data. For example, in some specific embodiments, the dust content in the exhaust gas is 30kg / day, the exhaust gas flow rate is 0.2-0.8m / s, and the volume of the buffer tank 36 is 1m 3 .

[0083] In some embodiments, there are multiple dust separation devices 30, at least one dust separation device 30 includes a sedimentation tank 31, and at least one dust separation device 30 includes a three-way pipe 35, a buffer tank 36 and a cyclone separator 37, so as to achieve multi-stage dust removal of exhaust gas.

[0084] Since the rotary sintering furnace 10 is in a high-temperature sintering environment, the dust separation device 30 is connected to the exhaust port 13 provided in the rotary sintering furnace 10. In some embodiments of the present application, the dust separation device 30 is provided with an insulation structure, such as insulation cotton, insulation shell, etc., which is conducive to avoiding the blockage caused by condensation of moisture in the tail gas at the dust separation device 30, making the tail gas flow smoother and improving the tail gas treatment efficiency. Among them, the thickness of the insulation cotton can be greater than or equal to 10mm, for example, the thickness of the insulation cotton can be set to 10mm, 20mm, 30mm, 40mm, 50mm, etc. The insulation shell can be an insulation metal shell or an insulation plastic shell, for example, the insulation shell can be an insulation aluminum shell, a polyvinyl chloride (PVC) insulation shell, a polyvinylidene fluoride (PVDF) insulation shell, etc.

[0085] In some embodiments of the present invention, Figure 1 and Figure 5 As shown, the spray tower 40 includes a tower body 41, a spray assembly 42, a liquid redistributor 43 and a demister 44. A second inlet 411 is provided on the side of the tower body 41 and a second outlet 412 is provided on the top. The spray assembly 42 includes a spray 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 spray head and the second inlet 411, and the demister 44 is located between the spray head and the second outlet 412.

[0086] After the tail gas enters the spray tower 40 from the second inlet 411 from the dust separation device 30, the liquid can be sprayed on the tail gas through the spray head on the upper side of the second inlet 411, so that a small amount of dust, coal tar, low-valent alkanes and other impurities in the tail gas adhere to the liquid and fall to the bottom of the tower body 41, thereby removing impurities from the tail gas. The liquid sprayed by the spray head will pass through the liquid redistributor 43 before being sprayed to the second inlet 411. The liquid redistributor 43 can disperse the liquid so that the sprayed liquid is more evenly distributed inside the tower body 41 to contact more tail gas, thereby achieving a better tail gas removal effect.

[0087] After a small amount of dust, coal tar, low-valent alkanes and other impurities are removed by the spray assembly 42, the exhaust gas is relatively light and can easily rise to the second outlet 412 above the second inlet 411. In the process of rising to the second outlet 412, the exhaust gas passes through the demister 44, which is conducive to removing water vapor mixed in the exhaust gas through the demister 44, further removing impurities from the exhaust gas, and reducing the possibility of condensation of water in the exhaust gas causing blockage of the second outlet 412, making it easier to discharge the exhaust gas.

[0088] The spray assembly 42 may include a pipeline, the liquid redistributor 43 may be a mesh, the demister 44 may be a grid demister, and the spray assembly 42, the liquid redistributor 43 and the demister 44 may all be made of stainless steel.

[0089] In some embodiments, a sewage outlet is provided at the bottom of the tower body 41 and a sewage pump is provided at the sewage outlet. The sewage pump can drive the sewage to flow so as to discharge the sewage from the sewage outlet.

[0090] In some embodiments, the spray tower 40 is provided with a water pump connected to the bottom of the tower body 41. The water pump can extract the liquid separated from the sewage at the bottom of the tower body 41 and transport it to the spray assembly 42 to recycle the spray liquid. The sewage is not easy to be extracted, which is conducive to saving water.

[0091] In some embodiments, Figure 5 As shown, there are multiple spray heads arranged in multiple layers in the vertical direction, and a liquid redistributor 43 is provided below each layer of spray heads, and a demister 44 is provided above the multi-layer spray heads. Through the cooperation of the multi-layer spray heads and the liquid redistributor 43, the tail gas at various locations in the tower body 41 can be sprayed multiple times in the vertical direction, and the impurities such as a small amount of dust and coal tar in the tail gas can be removed more thoroughly. Then, the demister 44 removes the water vapor in the tail gas after multiple spraying and impurity removal, thereby improving the impurity removal efficiency of the tail gas.

[0092] In some embodiments of the utility model, the polishing degree Ra of the inner wall surface of the processing device is ≤0.8μm. Making the inner wall surface of the processing device smoother is conducive to reducing the bonding rate of impurities in the exhaust gas in the processing device and accelerating the flow rate of the exhaust gas. For example, the polishing degree Ra is 0.4μm, 0.6μm, 0.8μm, etc. Especially for lithium-ion battery positive electrode materials, lithium-ion battery positive electrode materials are prone to impurities during the sintering process. Making the polishing degree Ra of the inner wall surface of the processing device ≤0.8μm can achieve a better effect of removing impurities from the exhaust gas during the exhaust gas treatment process.

[0093] In some embodiments, the sintering system 100 further includes a knocking device, which is used to knock the processing device to reduce the adhesion and accumulation of impurities such as dust and coal tar in the processing device and improve the impurity removal efficiency.

[0094] In some embodiments of the present invention, Figure 1As shown, the exhaust gas treatment system 20 is also connected in series with an induced draft fan 51, which is used to drive the exhaust gas to flow in the exhaust gas treatment system 20, so that the exhaust gas discharged from the exhaust port 13 can flow through the multi-stage treatment device without being easily blocked, thereby reducing the influence of wind resistance on the exhaust gas in the exhaust gas treatment system 20 during the flow of the exhaust gas, improving the reliability of the exhaust gas treatment, and under the action of the induced draft fan 51, it is difficult for outside air to enter the exhaust gas treatment system 20, which is beneficial to ensuring the protective gas atmosphere of the rotary sintering furnace 10.

[0095] For example, in some embodiments, the induced draft fan 51 can provide an extraction force to the exhaust gas discharged from the exhaust port 13, so that the exhaust gas passes through the dust separation device 30 and the spray tower 40 and is extracted from the spray tower 40, or the induced draft fan 51 can provide a blowing force to the exhaust gas discharged from the spray tower 40 to blow the exhaust gas out of the spray tower 40.

[0096] In some embodiments, an exhaust pump 52 and an exhaust pipe 53 are connected in series at the tail of the exhaust treatment system 20. The exhaust pipe 53 extends upward in a vertical direction. The exhaust pump 52 is used to discharge the exhaust gas discharged from the multi-stage treatment device to the exhaust pipe 53 to achieve high-altitude discharge of the treated exhaust gas.

[0097] In some embodiments of the present invention, Figure 1 and Figure 5 As shown, the exhaust gas treatment system 20 is connected to 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. Among them, the height refers to the height position along the vertical direction, that is, the height position of each part of the first connecting pipe 60 along 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 plane increases first and then decreases from one end to the other end. The first connecting pipe 60 is constructed into an inverted V shape or an inverted U shape without the existence of a horizontal pipe section that is easy to accumulate dust, which reduces the accumulation of dust in the first connecting pipe 60, makes the first connecting pipe 60 less likely to be blocked, and improves the exhaust gas treatment efficiency.

[0098] The first connecting pipe 60 may be made of metal or alloy, and the length of the first connecting pipe 60 may be determined according to the relative positions of the rotary sintering furnace 10 and the tail gas treatment system 20 during actual use.

[0099] In some embodiments, Figure 1 and Figure 5 As shown, 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, the second pipe section 62 connects the first pipe section 61 and the exhaust 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 point, and the angle α between the first pipe section 61 and the second pipe section 62 is greater than or equal to 60°.

[0100] The exhaust gas discharged from the exhaust port 13 flows to the treatment device after passing 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 obliquely upward first and then obliquely downward, and the angle α between the first pipe section 61 and the second pipe section 62 is ≥60°, which is conducive to reducing the wind resistance of the exhaust gas in the first connecting pipe 60, increasing the flow rate of the exhaust gas in the first connecting pipe 60, so that the exhaust gas can quickly enter the second pipe section 62 from the first pipe section 61, and in the second pipe section 62, the exhaust gas flows downward to the treatment device under its own gravity, 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, so that the first connecting pipe 60 is not easily blocked by impurity deposition, and the exhaust gas treatment efficiency is improved. The angle α between the first pipe section 61 and the second pipe section 62 can be 60°, 70°, 80°, etc.

[0101] In some embodiments, the exhaust gas treatment system 20 is also connected in series with an induced draft fan 51, which can 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 dust accumulation in the first connecting pipe 60.

[0102] In some embodiments, Figure 1 and Figure 5 As shown, at least one of the exhaust port 13 and the tail 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 of at least one of the exhaust port 13 and the tail gas treatment system 20 relative to the first connecting pipe 60 (e.g., expansion and telescopic deformation of the furnace body 15 of the rotary sintering furnace 10 switching between the cold state and the high temperature state), so that at least one of the exhaust port 13 and the tail gas treatment system 20 is not easy to be separated from the first connecting pipe 60, the connection is more reliable, and 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 tail gas treatment system 20 and the first connecting pipe 60 is reduced, which is conducive to ensuring the protective gas atmosphere of the rotary sintering furnace 10, and can reduce tail gas leakage, and improve the reliability of tail gas flowing from the rotary sintering furnace 10 to the tail gas treatment system 20.

[0103] For example, the exhaust port 13 and the first connecting pipe 60 are rigidly connected, such as by welding, riveting, flange connection and bolt connection, and the exhaust gas treatment system 20 is connected to the first connecting pipe 60 through a 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 a flexible pipe 80, etc.

[0104] The impurities accumulated in the flexible tube 80 can be poured into the downstream such as the first connecting tube 60 or the exhaust gas treatment system 20 by mechanical or manual shaking of the flexible tube 80, thereby reducing the accumulation of impurities in the flexible tube 80 and even clogging, increasing the exhaust gas flow rate, and facilitating the replacement of the flexible tube 80. The flexible tube 80 can be made of metal or alloy.

[0105] In some embodiments of the present invention, the polishing degree Ra of the first connecting tube 60 is ≤ 0.8 μm. Making the inner wall surface of the first connecting tube 60 relatively smooth is conducive to reducing the bonding rate of impurities in the exhaust gas in the first connecting tube 60, and reducing the possibility of the first connecting tube 60 being blocked by impurities adhering 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, lithium-ion battery positive electrode materials are prone to produce impurities during the sintering process. Making the polishing degree Ra of the first connecting tube 60 ≤ 0.8 μm can achieve a better effect of removing impurities from the exhaust gas during the exhaust gas treatment process.

[0106] Since the rotary sintering furnace 10 is in a high-temperature sintering environment, the first connecting pipe 60 is connected to the exhaust port 13 provided in the rotary sintering furnace 10. In some embodiments, the first connecting pipe 60 is provided with an insulation structure, such as insulation cotton, insulation shell, etc., which is conducive to avoiding the condensation of moisture in the tail gas at the first connecting pipe 60 to cause pipe blockage, so that the tail gas circulation is smoother and the tail gas treatment efficiency is improved. Among them, the thickness of the insulation cotton can be greater than or equal to 10mm, for example, the thickness of the insulation cotton can be set to 10mm, 20mm, 30mm, 40mm, 50mm, etc. The insulation shell can be an insulation metal shell or an insulation plastic shell, for example, the insulation shell can be an insulation aluminum shell, a polyvinyl chloride (PVC) insulation shell, a polyvinylidene fluoride (PVDF) insulation shell, etc.

[0107] In some embodiments, the sintering system 100 also includes a knocking device, which is used to knock the first connecting pipe 60 connecting the exhaust gas treatment system 20 and the exhaust port 13, thereby reducing the adhesion and accumulation of impurities such as dust and coal tar in the first connecting pipe 60, increasing the flow rate of the exhaust gas in the first connecting pipe 60, and improving the impurity removal efficiency.

[0108] In some embodiments of the present invention, Figure 1 As shown, the rotary sintering furnace 10 is provided with a furnace chamber 11 and an air inlet 12 and an exhaust port 13 connected to the furnace chamber 11. The air inlet 12 is used to introduce protective gas into the furnace chamber 11, and the exhaust port 13 is used to exhaust the tail gas in the furnace chamber 11. The two axial ends of the rotary sintering furnace 10 are respectively provided with a feed inlet 14 and a discharge port connected to the furnace chamber 11. The feed inlet 14 and the exhaust port 13 are arranged in the axial direction of the rotary sintering furnace 10 (for example, Figure 1The discharge port and the air inlet 12 are arranged at the same end of the rotary sintering furnace 10 in the axial direction (in the front and rear direction shown in FIG. 1 ). The feed port 14 is used to introduce materials into the furnace chamber 11. The materials enter the furnace chamber 11 from the feed port 14 and react in the furnace chamber 11 as the furnace chamber 11 rotates, and then leave the furnace chamber 11 from the discharge port. The protective gas enters the furnace chamber 11 from the air inlet 12, and the impurities carried by the materials in the furnace chamber 11 are discharged from the furnace chamber 11 from the exhaust port 13 along with the protective gas inside the furnace chamber 11 to form tail gas.

[0109] In the related art, the materials introduced into the furnace chamber may contain more moisture and oil, which may easily lead to serious material adhesion problems at the inner wall of the feeding end of the rotary sintering furnace. After the materials stick together, it is easy to cause local over-temperature, resulting in over-sintering of the materials and material loss. In addition, excessive temperature will cause the materials to react with the furnace body, causing metal precipitation, resulting in excessive magnetic content in the product, affecting product performance.

[0110] The present application sets the feed port 14 and the exhaust port 13 at the same end of the rotary sintering furnace 10 in the axial direction, and sets the discharge port and the air inlet 12 at the same end of the rotary sintering furnace 10 in the axial direction, so that the impurities such as moisture and oil between the materials at the feed port 14 can be brought in by the tail gas, thereby reducing the possibility of material adhesion at the inner wall of the rotary sintering furnace 10. Moreover, the protective gas is filled from the product discharge end of the rotary sintering furnace 10 and flows to the raw material input end, so that the protective gas inside the rotary sintering furnace 10 is sufficient, which is conducive to ensuring the protective gas atmosphere inside 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 full, and the internal environment of the furnace chamber 11 maintains a positive pressure environment, avoiding the infiltration of external gas from the component installation gap, which is conducive to controlling the oxygen content of the gas atmosphere inside the rotary sintering furnace 10, thereby effectively avoiding the oxidation of the sintered product and causing the product to deteriorate, and improving the product quality.

[0111] For example, in some specific embodiments, Figure 1 As shown, the air inlet 12 and the discharge port are arranged at the axial rear end of the rotary sintering furnace 10, and the feed 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 impurities in the material can be more fully carried away by the exhaust gas and the protective gas can fill the furnace cavity 11.

[0112] In some embodiments of the present invention, the sintering system 100 also includes a knocking device, which is used to knock on the second connecting pipe 70 connecting two adjacent processing devices, thereby reducing the adhesion and accumulation of impurities such as dust and coal tar in the second connecting pipe 70, increasing the flow rate of the exhaust gas between the two adjacent processing devices, and improving the impurity removal efficiency.

[0113] In some embodiments, the polishing degree Ra of the inner wall surface of the second connecting tube 70 is ≤ 0.8 μm. Making the inner wall surface of the second connecting tube 70 relatively smooth is conducive to reducing the bonding rate of impurities in the exhaust gas in the second connecting tube 70, and reducing the possibility of the second connecting tube 70 being blocked by impurities adhering 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, lithium-ion battery positive electrode materials are prone to produce impurities during the sintering process. Making the polishing degree Ra of the inner wall surface of the second connecting tube 70 ≤ 0.8 μm has a better effect on removing impurities from the exhaust gas during the exhaust gas treatment process.

[0114] Other structures and operations of the sintering system 100 according to the embodiment of the present invention are known to those skilled in the art and will not be described in detail here.

[0115] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0116] In the description of this specification, the description with reference to the terms "embodiment", "specific embodiment", "example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation 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.

[0117] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A sintering system, characterized in that: include: A rotary sintering furnace, wherein the rotary sintering furnace is provided with an exhaust port for exhausting tail gas; A tail gas treatment system is connected to the exhaust port and is used to treat the tail gas discharged from the rotary sintering furnace. The tail gas treatment system includes a multi-stage treatment device connected in series, wherein: At least one level of the treatment device is a dust separation device, which is used to separate dust from the tail gas; at least one level of the treatment device is a spray tower, which is located downstream of the dust separation device and is used to wash the tail gas treated by the dust separation device; The exhaust gas treatment system is connected to the exhaust port through a first connecting pipe, and the height of the first connecting pipe in the vertical direction first increases and then decreases from one end to the other end of the first connecting pipe.

2. The sintering system according to claim 1, characterized in that: The dust separation device comprises a sedimentation tank, the sedimentation 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 baffle extends in a vertical direction or in an inclined downward direction, and a plurality of the baffles are arranged in a staggered manner at intervals in a horizontal direction and divide the inner space of the tank into a plurality of subspaces arranged in the horizontal direction, and the two subspaces located at the two ends of the horizontal direction are respectively connected to the first inlet and the first outlet, The baffle is provided with a communication opening for connecting two adjacent subspaces, and projections of the communication openings of any two adjacent baffles along the arrangement direction of the baffles do not overlap.

3. The sintering system according to claim 2, characterized in that: The sedimentation tank further comprises a dust exhaust port at the bottom, and the plurality of sub-spaces are all connected to the dust exhaust port.

4. The sintering system according to claim 3, characterized in that: The tank body includes a guide cavity and a dust collecting cavity connected to the guide cavity. The guide cavity is located above the dust collecting cavity, and the cross-sectional area of ​​the dust collecting cavity on the horizontal plane gradually decreases in the direction away from the guide cavity. The dust exhaust port is connected to the dust collecting cavity.

5. The sintering system according to claim 1, characterized in that: The dust separation device comprises a three-way pipe, a buffer tank and a cyclone separator, the three-way pipe comprises a first pipe body, a second pipe body and a third pipe body, the air inlet end of the first pipe body is connected to the exhaust port, the air outlet end of the first pipe body is connected to the air inlet end of the second pipe body and the air inlet end of the third pipe body, the air outlet end of the second pipe body is connected to the cyclone separator, and the air outlet end of the third pipe body is connected to the buffer tank. The air inlet end of the first tube body is not lower than the air outlet end of the first tube body in the vertical direction, the air outlet end of the third tube body is lower than the air inlet end of the third tube body in the vertical direction, the angle between the first tube body and the second tube body is a, the angle between the second tube body and the vertical downward direction is b, and the angle between the third tube body and the vertical downward direction is c, wherein, a≥90°, b>0°, c≤b.

6. The sintering system according to claim 1, characterized in that: The dust separation device comprises a three-way pipe, a buffer tank and a cyclone separator, the three-way pipe comprises a first pipe body, a second pipe body and a third pipe body, the air inlet end of the first pipe body is connected to the exhaust port, the air outlet end of the first pipe body is connected to the air inlet end of the second pipe body and the air inlet end of the third pipe body, the air outlet end of the second pipe body is connected to the cyclone separator, and the air outlet end of the third pipe body is connected to the buffer tank. The first tube body and the third tube body both extend in a vertical direction, and the second tube body extends in a horizontal direction.

7. The sintering system according to claim 5 or 6, characterized in that: The buffer tank is provided with a first opening on the top and a second opening on the bottom, the first opening is communicated with the three-way pipe, and the second opening is used to discharge 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 connected to the three-way pipe, the fourth opening is connected to the downstream processing device, and the fifth opening is used to discharge sediment and is provided with an on-off valve.

8. The sintering system according to claim 1, characterized in that: The spray tower includes 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 includes a spray head, which 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.

9. The sintering system according to claim 8, characterized in that: There are multiple spray heads arranged in multiple layers along the vertical direction. The liquid redistributor is arranged below each layer of the spray heads, and the demister is arranged above the multiple layers of the spray heads.

10. The sintering system according to claim 1, characterized in that: The exhaust gas treatment system is also connected in series with an induced draft fan, which is used to drive the exhaust gas to flow in the exhaust gas treatment system.

11. The sintering system according to claim 1, characterized in that: The first connecting pipe includes 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 exhaust gas treatment system, the first pipe section and the second pipe section extend downward and away from each other from their connection, and the angle between the first pipe section and the second pipe section is greater than or equal to 60°.

12. The sintering system according to claim 1, characterized in that: At least one of the exhaust port and the exhaust gas treatment system is connected to the first connecting pipe through a flexible pipe.

13. The sintering system according to claim 1, characterized in that: 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 processing device is less than or equal to 0.8 μm.

14. The sintering system according to claim 1, characterized in that: The rotary sintering furnace is provided with a furnace cavity and an air inlet and an exhaust port connected to the furnace cavity, the air inlet is used to introduce protective gas into the furnace cavity, and the exhaust port is used to discharge the exhaust gas in the furnace cavity; the two axial ends of the rotary sintering furnace are respectively provided with a feed port and a discharge port connected to the furnace cavity, the feed port and the exhaust port are arranged at the same axial end of the rotary sintering furnace, and the discharge port and the air inlet are arranged at the same axial end of the rotary sintering furnace.

15. The sintering system according to claim 1, characterized in that: It also includes a knocking device, which is used to knock the processing device; and / or, the knocking device is used to knock the first connecting pipe connecting the exhaust gas treatment system and the exhaust port; and / or, the knocking device is used to knock the second connecting pipe connecting two adjacent processing devices.

16. The sintering system according to any one of claims 1-6 and 8-15, characterized in that: The first connecting pipe and / or the dust separation device are / is provided with a heat-insulating structure outside.

17. The sintering system according to claim 1, characterized in that: The sintering system is used in the preparation of new energy materials to dynamically sinter raw materials. The new energy materials include lithium-ion battery positive electrode materials. The lithium-ion battery positive electrode materials include one of lithium iron phosphate, lithium cobalt oxide, and lithium nickel cobalt manganese oxide.

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