Gas-solid reaction rotary furnace
The gas-solid reaction rotary kiln with tilting rotation and multi-jet port design solves the problem of insufficient material filling in rotary kilns, achieving higher powder utilization and reaction efficiency, and improving production efficiency and product uniformity.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- BERZELIUS (HEFEI) CO LTD
- Filing Date
- 2025-08-07
- Publication Date
- 2026-07-14
AI Technical Summary
The limited material filling capacity of existing rotary kilns leads to an increase in the amount of powder lost with the gas, resulting in material waste. Furthermore, the uneven distribution of powder within the kiln affects reaction efficiency and production capacity.
A gas-solid reaction rotary kiln is designed. By tilting and rotating the kiln tube and setting multiple air jets, filter elements, and return feeders, the contact frequency between powder and reaction gas is increased, powder loss is reduced, and the loading capacity of the rotary kiln is increased by tilting and rotating.
It improves the reaction rate and product uniformity of powder, reduces powder loss, increases single-furnace capacity, and reduces material energy consumption and processing costs per unit weight.
Smart Images
Figure CN224499040U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of gas-solid reaction equipment, and more particularly to a gas-solid reaction rotary furnace. Background Technology
[0002] In many powder material industries, such as lithium-ion battery cathode and anode materials, and coating fillers, vapor-phase surface treatment or infiltration treatment of the corresponding powder materials is required. However, conventional rotary kilns have limited material filling capacity, typically 10-30% of the rotary kiln's volume. Since the material in a rotary kiln is usually powder, further increasing the filling capacity would increase the amount of powder lost with the gas, resulting in material waste. Utility Model Content
[0003] To address the aforementioned issues, this application provides a gas-solid reaction rotary kiln in which the kiln tubes are tilted during operation to increase the amount of packing material.
[0004] This application provides a gas-solid reaction rotary furnace, comprising:
[0005] Support frame, including:
[0006] Base;
[0007] The frame is rotatably connected to the base;
[0008] A first actuator is used to drive the frame to rotate;
[0009] A rotary kiln tube is disposed on the frame, and the rotary kiln tube includes a powder inlet / outlet end and a gas inlet / outlet end;
[0010] A gas assembly is disposed at the gas inlet and outlet ends of the rotary kiln tube. When the gas assembly supplies gas to the rotary kiln tube, the rotary kiln tube can move to a position where the gas inlet and outlet ends are higher than the powder inlet and outlet ends.
[0011] According to some embodiments of this application, the top surface of the base is inclined.
[0012] According to some embodiments of this application, the gas assembly includes:
[0013] A sleeve is provided on the rotary kiln tube;
[0014] An air inlet pipe extends through the sleeve and into the rotary kiln tube;
[0015] The return feeder extends through the sleeve into the rotary kiln tube;
[0016] An exhaust pipe is connected to the return feeder. The exhaust pipe is located outside the rotary kiln tube. Dust falling from the exhaust pipe during exhaust can enter the return feeder, which then sends the dust into the rotary kiln tube.
[0017] According to some embodiments of this application, the portion of the air inlet pipe located in the rotary kiln tube is provided with multiple air jets.
[0018] According to some embodiments of this application, the gas assembly further includes a filter element disposed at the inlet end of the outlet pipe.
[0019] According to some embodiments of this application, the gas assembly further includes a backflush pipe connected to the outlet pipe.
[0020] According to some embodiments of this application, the gas assembly further includes:
[0021] A first pressure gauge is connected to the intake pipe;
[0022] The second pressure gauge is connected to the air outlet pipe.
[0023] According to some embodiments of this application, the gas-solid reaction rotary furnace further includes a plurality of first material plates disposed on the rotary furnace tube, and at least some of the first material plates are disposed at an angle relative to the axis of the rotary furnace tube.
[0024] According to some embodiments of this application, the rotary kiln tube includes:
[0025] The pipe body has a material inlet at one end;
[0026] A furnace plug is detachably connected to the tube body, and the furnace plug is capable of sealing the feed port of the tube body.
[0027] According to some embodiments of this application, the gas-solid reaction rotary furnace further includes a second packing plate, which is disposed on the end face of the furnace plug located inside the tube.
[0028] The beneficial effects of the gas-solid reaction rotary furnace of this application are as follows:
[0029] 1. Extending the inlet pipe into the rotary kiln tube allows the reaction gas to be quickly delivered into the rotary kiln tube. The reaction gas and carrier gas ejected from the inlet pipe can lift the powder to be processed inside the rotary kiln tube, increasing the contact frequency between the powder and the reaction gas, thereby increasing the reaction rate and saving reaction time.
[0030] 2. The air inlet pipe is equipped with multiple jet nozzles. The gas ejected from the air inlet pipe will reduce the dead corners where powder accumulates in the furnace, and avoid the problem of insufficient reaction caused by the low frequency and short contact time between the powder and the reaction gas in the dead corners. This increases the uniformity of the product in all positions in the rotary kiln tube.
[0031] 3. The filter screen of the exhaust pipe can prevent the powder in the rotary kiln tube from being discharged from the furnace tube with the carrier gas, thereby improving the yield of each batch of production and reducing the loss of powder. Long-term high temperature and high dust density operation can easily cause the filter screen to become clogged and fail. The filter screen is set outside the rotary kiln tube to reduce the possibility of filter screen clogging.
[0032] 4. Maintaining the tilted rotation of the furnace tubes during gas-solid reaction rotary kiln operation can increase the loading capacity of the rotary kiln tubes, increase the single furnace capacity, and reduce the energy consumption per unit weight of material, processing time, and cost. Attached Figure Description
[0033] To more clearly illustrate the technical solutions of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without exceeding the scope of protection claimed by this application.
[0034] Figure 1 This is a schematic diagram of the gas-solid reaction rotary furnace in the embodiments of this application. Figure 1 ;
[0035] Figure 2 This is a schematic diagram of the gas-solid reaction rotary furnace in the embodiments of this application. Figure 2 ;
[0036] Figure 3 This is a schematic diagram of the support frame according to an embodiment of this application;
[0037] Figure 4 This is a schematic diagram of a gas assembly according to an embodiment of this application;
[0038] Figure 5 This is a schematic diagram of another gas component according to an embodiment of this application;
[0039] Figure 6 This is an exploded view of the rotary kiln tube in an embodiment of this application. Detailed Implementation
[0040] The technical solutions of this application will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.
[0041] like Figure 1 and Figure 2As shown, an embodiment of this application provides a gas-solid reaction rotary furnace 100, which includes a support frame 1, a rotary furnace tube 2, and a gas assembly 3.
[0042] like Figure 3 As shown, the support frame 1 includes a base 11, a frame 12, and a first actuator 13. The frame 12 is rotatably connected to the base 11. For example, the frame 12 is rotatably mounted on the top surface of the base 11 via a pivot 111, with the pivot 111 located at one end of the frame 12, and the other end of the frame 12 capable of swinging up and down. The first actuator 13 is disposed on the base 11. Optionally, the first actuator 13 is a hydraulic cylinder, and the telescopic rod of the first actuator 13 is connected to the frame 12 to drive the frame 12 to rotate.
[0043] like Figure 2 As shown, the rotary kiln tube 2 is rotatably mounted on the frame 12, and the rotary kiln tube 2 can rotate around its own axis. A second driver 121 is provided on the frame 12. Optionally, the second driver 121 is a motor, and the second driver 121 can drive the rotary kiln tube 2 to rotate around its own axis. The two ends of the rotary kiln tube are a powder inlet / outlet end 2a and a gas inlet / outlet end 2b, respectively. The powder enters and exits the cavity of the rotary kiln tube 2 through the powder inlet / outlet end 2a.
[0044] Gas assembly 3 is located at the gas inlet / outlet end 2b of rotary kiln tube 2. The gas required for the gas-solid reaction enters the rotary kiln tube 2 through gas assembly 3. Optionally, the gas introduced into the rotary kiln tube 2 by gas assembly 3 includes reaction gas and carrier gas. The reaction gas reacts with the powder, and the carrier gas and the reaction-generated gas are discharged through gas assembly 3.
[0045] Optionally, the angle between the axis of the rotary kiln tube 2 and the horizontal plane is -20° to 50°. When the rotary kiln tube 2 is being fed, the first driver 13 drives the frame 12 to rotate so that the powder inlet / outlet end 2a of the rotary kiln tube 2 is higher than the gas inlet / outlet end 2b. For example, the angle between the axis of the rotary kiln tube 2 and the horizontal plane is -20° so that more powder can be added to the rotary kiln tube 2.
[0046] During the gas-solid reaction, the gas assembly 3 supplies gas to the rotary kiln tube 2, and the first driver 13 drives the frame 12 to rotate upward. The rotary kiln tube 2 moves to a position where the gas inlet / outlet end 2b is higher than the powder inlet / outlet end 2a. For example, the angle between the axis of the rotary kiln tube 2 and the horizontal plane is 30° to prevent the powder in the rotary kiln tube 2 from clogging the gas assembly 3.
[0047] In some embodiments, the top surface of the base 11 is inclined, for example, the angle between the top surface of the base 11 and the horizontal plane is -20°, which facilitates the rotation of the frame 12.
[0048] like Figure 4As shown, in some embodiments, the gas assembly 3 includes: a sleeve 31, an inlet pipe 32, a return feeder 33, and an outlet pipe 34.
[0049] A sleeve 31 is installed at the gas inlet / outlet end 2b of the rotary kiln tube 2. One end of the sleeve 31 enters the rotary kiln tube 2, and the other end is located outside the rotary kiln tube 2. An inlet pipe 32 extends through the sleeve 31 into the rotary kiln tube 2, with one end of the inlet pipe 32 located outside the rotary kiln tube 2. Gas enters the rotary kiln tube 2 through the inlet pipe 32.
[0050] One end of the return feeder 33 extends through the sleeve 31 into the rotary kiln tube 2. An exhaust pipe 34 is located at the top of the return feeder 33 and communicates with it; the exhaust pipe 34 is situated outside the rotary kiln tube 2. When the exhaust pipe 34 discharges air, the falling dust enters the return feeder 33, which then feeds the dust into the rotary kiln tube 2, reducing dust loss and improving the material recovery rate.
[0051] In some embodiments, the return feeder 33 is a screw return feeder 331, which can be an existing screw conveyor. The vent pipe 34 is connected to the inner cavity of the screw return feeder 331. When the vent pipe 34 exhausts air, the falling dust enters the screw return feeder 331, and the screw return feeder 331 sends the dust into the rotary kiln tube 2.
[0052] like Figure 5 As shown, in some embodiments, the return feeder 33 is a pulse backflushing return feeder 332, which can be an existing pulse backflushing return feeder. The exhaust pipe 34 is connected to the inner cavity of the pulse backflushing return feeder 332. When the exhaust pipe 34 exhausts, the falling dust enters the pulse backflushing return feeder 332, and the pulse backflushing return feeder 332 sends the dust into the rotary kiln tube 2.
[0053] The gas supplied by the inlet pipe 32 is either a reaction gas or a mixture of reaction gas and carrier gas. The reaction gas reacts with the powder in the rotary kiln tube 2. The remaining tail gas is discharged through the return feeder 33, and the dust falling from the tail gas is sent back into the rotary kiln tube 2 through the return feeder 33. During the gas-solid reaction, the powder in the rotary kiln tube 2 should not exceed the port of the return feeder 33.
[0054] In some embodiments, the portion of the inlet pipe 32 located within the rotary kiln tube 2 is provided with multiple jet nozzles 321. The gas ejected from the inlet pipe 32 can lift the powder in the rotary kiln tube 2, increasing the contact frequency between the powder and the reactant gas, thereby increasing the reaction rate and reaction uniformity. The gas ejected from the inlet pipe 32 can reduce dead zones where powder accumulates in the rotary kiln tube 2, avoiding the problem of insufficient reaction caused by low contact frequency and short contact time between the powder and the reactant gas in dead zones, thus increasing the uniformity of the product at all locations within the rotary kiln tube 2.
[0055] In some embodiments, the gas assembly 3 further includes a filter element 35 disposed at the inlet end of the outlet pipe 34. The filter element 35 is used to filter dust in the exhaust gas, reducing the possibility of dust entering the outlet pipe 4.
[0056] In some embodiments, the gas assembly 3 further includes a backflush pipe 36, which is connected to the outlet pipe 34. Gas is delivered to the filter element 35 and the return feeder 33 through the backflush pipe 36, enabling backflush cleaning of the filter element 35 and the return feeder 33.
[0057] In some embodiments, the gas assembly 3 further includes a first pressure gauge 37 and a second pressure gauge 38. The first pressure gauge 37 is connected to the inlet pipe 32 and is used to detect the pressure of the gas in the inlet pipe 32. The second pressure gauge 38 is connected to the outlet pipe 34 and is used to detect the pressure of the gas in the outlet pipe 34.
[0058] like Figure 2 As shown, in some embodiments, the gas-solid reaction rotary kiln 100 further includes a plurality of first conveyor plates 4, at least some of which are inclined relative to the axis of the rotary kiln tube 2. The size and inclination angle of the first conveyor plates 4 are set according to requirements. When the rotary kiln tube 2 rotates, the first conveyor plates 4 can lift the powder to increase the contact frequency between the powder and the reaction gas.
[0059] like Figure 6 As shown, in some embodiments, the rotary kiln tube 2 includes a tube body 21 and a furnace plug 22. One end of the tube body 21 is provided with a material inlet 211, and the other end is provided with a mechanical seal 213, which is used to seal the connection between the sleeve 31 and the tube body 21. The furnace plug 22 is detachably connected to the tube body 21, and the furnace plug 22 can close the material inlet 211 of the tube body 21. For example, the outer wall of the furnace plug 22 is provided with a first protrusion 221, and the end of the tube body 21 where the material inlet 221 is located is provided with a second protrusion 212. The first protrusion 221 and the second protrusion 212 are detachably connected by bolts, allowing the furnace plug 22 to enter the tube body 21 to close the material inlet 211 of the tube body 21.
[0060] When the rotary kiln tube 2 is feeding or discharging material, the furnace plug 22 is pulled out from the tube body 21. When the rotary kiln tube 2 is working, the furnace plug 22 is inserted into the tube body 21.
[0061] Optionally, the outer wall of the tube 21 is provided with a first gear 214, and the output end of the second driver 121 is provided with a second gear that matches the first gear 214, so that the second driver 121 can drive the rotary kiln tube 2 to rotate.
[0062] In some embodiments, the gas-solid reaction rotary kiln 100 further includes a second conveyor plate 5, which is disposed on the end face of the furnace plug 22 located inside the tube 21. The second conveyor plate 5 plays a stirring role for the powder inside the tube 21.
[0063] Optionally, the frame 12 is provided with a heater 122 and an insulation layer 123. The heater 122 can be an existing heater, and the insulation layer 123 can be an existing insulation layer. The heater 123 is used to heat the rotary kiln tube 2. The frame 12 is also provided with a thermocouple 124, which is used to detect the temperature of the rotary kiln tube 2.
[0064] Traditional horizontally rotating rotary kilns have limited packing capacity, typically 10-30% of the kiln's capacity. Excessive packing can lead to powder being discharged with the exhaust gas, causing powder loss or blockage of the exhaust pipe. This embodiment sets the rotary kiln to operate at an inclined rotation, with the exhaust port located at a higher point in the kiln tube. It is equipped with a filter and a return feeder to reduce powder discharge with the exhaust gas. Simultaneously, it intercepts powder in the exhaust gas and returns it to the rotary kiln tube to continue participating in the reaction. In this embodiment, the packing capacity of the gas-solid reaction rotary kiln can reach 50% of the kiln tube capacity, increasing the single-furnace capacity.
[0065] The embodiments of this application have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The descriptions of the embodiments above are only for the purpose of helping to understand the technical solutions and core ideas of this application. Therefore, any changes or modifications made by those skilled in the art based on the ideas of this application, and on the specific implementation methods and application scope of this application, are all within the scope of protection of this application. In summary, the content of this specification should not be construed as a limitation of this application.
Claims
1. A gas-solid reaction rotary furnace, characterized in that, include: Support frame, including: Base; The frame is rotatably connected to the base; A first actuator is used to drive the frame to rotate; A rotary kiln tube is disposed on the frame, and the rotary kiln tube includes a powder inlet / outlet end and a gas inlet / outlet end; A gas assembly is disposed at the gas inlet and outlet ends of the rotary kiln tube. When the gas assembly supplies gas to the rotary kiln tube, the rotary kiln tube can move to a position where the gas inlet and outlet ends are higher than the powder inlet and outlet ends.
2. The gas-solid reaction rotary furnace according to claim 1, characterized in that, The top surface of the base is inclined.
3. The gas-solid reaction rotary furnace according to claim 1, characterized in that, The gas assembly includes: A sleeve is provided on the rotary kiln tube; An air inlet pipe extends through the sleeve and into the rotary kiln tube; The return feeder extends through the sleeve into the rotary kiln tube; An exhaust pipe is connected to the return feeder. The exhaust pipe is located outside the rotary kiln tube. Dust falling from the exhaust pipe during exhaust can enter the return feeder, which then sends the dust into the rotary kiln tube.
4. The gas-solid reaction rotary furnace according to claim 3, characterized in that, The portion of the air inlet pipe located within the rotary kiln tube is provided with multiple air jets.
5. The gas-solid reaction rotary furnace according to claim 3, characterized in that, The gas assembly also includes a filter element disposed at the inlet end of the outlet pipe.
6. The gas-solid reaction rotary furnace according to claim 3, characterized in that, The gas assembly also includes a backflush pipe, which is connected to the outlet pipe.
7. The gas-solid reaction rotary furnace according to claim 3, characterized in that, The gas assembly also includes: A first pressure gauge is connected to the intake pipe; The second pressure gauge is connected to the air outlet pipe.
8. The gas-solid reaction rotary furnace according to claim 1, characterized in that, It also includes a plurality of first material plates, which are disposed on the rotary kiln tube, and at least some of the first material plates are disposed at an angle relative to the axis of the rotary kiln tube.
9. The gas-solid reaction rotary furnace according to claim 1, characterized in that, The rotary kiln tube includes: The pipe body has a material inlet at one end; A furnace plug is detachably connected to the tube body, and the furnace plug is capable of sealing the feed port of the tube body.
10. The gas-solid reaction rotary furnace according to claim 9, characterized in that, It also includes a second material-carrying plate, which is disposed on the end face of the furnace plug located inside the tube.