Gas-solid reaction rotary furnace

Abstract

The utility model relates to a gas-solid reaction rotary furnace. The gas-solid reaction rotary furnace comprises a support frame; the rotary furnace tube is arranged on the supporting frame and comprises a feeding section and a discharging section; one end of the rotating section is rotationally connected with the feeding section; the other end of the rotating section is rotationally connected with the discharging section, and the discharging section is provided with a discharging opening; the air inlet pipe is arranged at the discharging section and extends into the rotary furnace tube, and the end part of the air inlet pipe is obliquely arranged downwards relative to the axis of the rotary furnace tube; the air outlet assembly is arranged on the feeding section; the feeding assembly is arranged on the feeding section; and the discharging assembly is connected with the discharging opening. According to the gas-solid reaction rotary furnace, the gas inlet pipe extends into the rotary furnace tube, reaction gas and carrier gas sprayed out of the gas inlet pipe can raise powder accumulated at the bottom of the rotary furnace tube in the furnace tube, and the contact frequency of the powder and the reaction gas is increased.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of gas-solid reaction equipment, in particular to a gas-solid reaction rotary furnace. BACKGROUND

[0002] In many powder material industries, such as positive and negative electrode materials of lithium ion batteries, paint fillers, etc., the corresponding powder materials need to be subjected to gas phase surface treatment or permeation treatment. The conventional continuous rotary furnace or rotary kiln has limited contact between the material and the gas, and the reaction is slow and uneven. In addition, the reaction gas and the powder will be deposited on the inner wall of the furnace tube, forming clumps and affecting the performance of the product. CONTENT OF THE UTILITY MODEL

[0003] Based on the above problems, the present application provides a gas-solid reaction rotary furnace, which improves the contact frequency of the powder and the reaction gas, thereby improving the reaction rate and reaction uniformity.

[0004] The present application provides a gas-solid reaction rotary furnace, comprising:

[0005] a support frame;

[0006] a rotary furnace tube arranged in the support frame, the rotary furnace tube comprising:

[0007] a feeding section;

[0008] a rotating section rotationally connected to the feeding section at one end;

[0009] a discharging section rotationally connected to the rotating section at the other end, the discharging section being provided with a discharge port;

[0010] a gas inlet pipe arranged in the discharging section, the gas inlet pipe extending into the rotary furnace tube, and the end of the gas inlet pipe being arranged obliquely downward relative to the axis of the rotary furnace tube;

[0011] a gas outlet assembly arranged in the feeding section;

[0012] a feeding assembly arranged in the feeding section;

[0013] a discharging assembly connected to the discharge port.

[0014] According to some embodiments of the present application, the part of the gas inlet pipe located in the rotary furnace tube is provided with a plurality of gas injection ports.

[0015] According to some embodiments of the present application, the gas-solid reaction rotary furnace further comprises a plurality of material carrying plates, the plurality of material carrying plates being arranged in the rotating section of the rotary furnace tube, a part of the material carrying plates being arranged parallel to the axis of the rotary furnace tube, and the other part of the material carrying plates being arranged obliquely relative to the axis of the rotary furnace tube.

[0016] According to some embodiments of the present application, the discharge section is further provided with a slag discharge port, and the rotating section comprises:

[0017] a rotating section body, one end of which is rotatably connected to the feeding section, and the other end of which is rotatably connected to the discharge section;

[0018] a screen, which is connected to the rotating section body, is located in the discharge section, and the end of the screen corresponds to the slag discharge port.

[0019] According to some embodiments of the present application, the air inlet pipe comprises:

[0020] a fixed plate, which is arranged in the discharge section;

[0021] a pipe body, which is arranged in the fixed plate and extends into the rotary furnace pipe.

[0022] According to some embodiments of the present application, the air outlet assembly comprises:

[0023] a first screw feeder, one end of which is connected to the feeding section;

[0024] a dust collector, which is connected to the other end of the first screw feeder.

[0025] According to some embodiments of the present application, the feeding assembly comprises:

[0026] a hopper;

[0027] a second screw feeder, one end of which is connected to the hopper, and the other end of which is connected to the feeding section.

[0028] According to some embodiments of the present application, the discharge assembly comprises:

[0029] a screw discharge device, one end of which is connected to the discharge port;

[0030] a material collector, which is connected to the other end of the screw discharge device.

[0031] According to some embodiments of the present application, the discharge assembly further comprises a cooler, which is arranged on the outer wall of the screw discharge device.

[0032] According to some embodiments of the present application, the gas-solid reaction rotary furnace further comprises a heating assembly, which is used for heating the rotary furnace pipe.

[0033] The gas-solid reaction rotary furnace of the present application has the following advantages:

[0034] The end of the air inlet pipe is inclinedly arranged, and the reaction gas and the carrier gas sprayed from the air inlet pipe can lift the powder accumulated at the bottom of the rotary furnace pipe in the furnace pipe, increase the contact frequency of the powder and the reaction gas, thereby increasing the reaction rate and saving the reaction time.

[0035] The air spraying direction of the air inlet pipe lifts the powder to the feeding direction of the rotary furnace pipe, increases the residence time and floating time of the powder in the furnace pipe, solves the problem of insufficient reaction caused by low contact frequency and short contact time of the powder and the reaction gas, and increases the uniformity of the products at each position in the furnace pipe.

[0036] The end of the air inlet pipe blows air into the furnace pipe, which can blow off the agglomerates on the inner wall of the furnace pipe. The improvement of the contact between the powder and the reaction gas also improves the utilization rate of the reaction gas, reduces the consumption and invalid emission of the reaction gas, and reduces the invalid deposition and agglomeration of the reaction gas and the powder on the inner wall of the furnace pipe and the material belt, greatly prolonging the period of cleaning of the rotary furnace.

[0037] The dust collector of the air outlet assembly can prevent the powder in the furnace pipe from being discharged with the carrier gas, and the collected powder can be returned to the furnace pipe through the first screw feeder, thereby reducing the loss of the powder, improving the yield of the production, and reducing the production cost. BRIEF DESCRIPTION OF DRAWINGS

[0038] In order to more clearly illustrate the technical solutions of the present application, the following will briefly introduce the drawings needed to be used in the embodiment description. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained according to these drawings without departing from the scope of the present application.

[0039] Figure 1 The schematic diagram of the gas-solid reaction rotary furnace of the embodiment of the present application;

[0040] Figure 2 The schematic diagram of the rotary furnace pipe of the embodiment of the present application;

[0041] Figure 3 The schematic diagram of the air inlet pipe of the embodiment of the present application Figure 1 ;

[0042] Figure 4 The schematic diagram of the air inlet pipe of the embodiment of the present application Figure 2 . DETAILED DESCRIPTION

[0043] With reference to the drawings of the embodiments of the present application, the technical solutions of the present application are clearly and completely described. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments of the present application, all the other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0044] As shown in Figure 1 Embodiments of the present application provide a gas-solid reaction rotary furnace 100, which comprises a support frame 1, a rotary furnace tube 2, an air inlet pipe 3, an air outlet assembly 4, a feed assembly 5 and a discharge assembly 6.

[0045] As shown in Figure 2 The support frame 1 is used to provide support for the rotary furnace tube 2. The rotary furnace tube 2 is arranged on the support frame 1, and the rotary furnace tube 2 comprises a feed section 21, a rotating section 22 and a discharge section 23 which are in communication with each other. The feed section 21 and the discharge section 23 are fixedly arranged on the support frame 1, and the rotating section 22 is rotatably arranged on the support frame 1, for example, the rotating section 22 is rotatably arranged on the support frame 1 through a bearing. One end of the rotating section 22 is rotatably connected to the feed section 21, for example, the rotating section 22 is rotatably connected to the feed section 21 through a first mechanical seal 24. The other end of the rotating section 22 is rotatably connected to the discharge section 23, for example, the rotating section 22 is rotatably connected to the discharge section 23 through a second mechanical seal 25. A motor M is arranged on the support frame 1, and a gear 26 is arranged on the outer wall of the rotating section 22, and the motor M is connected to the gear 26 through a transmission mechanism to drive the rotating section 22 to rotate.

[0046] The end of the feed section 21 away from the rotating section 22 and the end of the discharge section 23 away from the rotating section 22 are both closed. Optionally, the feed section 21 and the discharge section 23 are both provided with a barometer P to detect the air pressure in the rotary furnace tube 2.

[0047] The discharge section 23 is provided with a discharge port 27, and the end of the rotating section 22 extends into the discharge section 23, and the material in the rotating section 22 is discharged from the rotary furnace tube 2 through the discharge port 27.

[0048] The air inlet pipe 3 is arranged in the discharge section 23, the air inlet pipe 3 extends into the rotary furnace tube 2, and the end of the air inlet pipe 3 is located in the rotating section 22. The end of the air inlet pipe 3 located in the rotary furnace tube 2 is arranged obliquely downward with respect to the axis of the rotary furnace tube 2, so that the end of the air inlet pipe 3 is closer to the inner wall of the rotary furnace tube 2. The distance between the end of the air inlet pipe 3 and the inner wall of the rotary furnace tube 2 is set according to requirements.

[0049] The gas ejected from the inlet pipe 3 can lift the powder accumulated at the bottom of the rotary kiln tube 2 inside the tube, increasing the contact frequency between the powder and the reactant gas. The gas ejected from the inlet pipe 3 can also blow off the clumps on the inner wall of the tube. Relative to the vertical direction, the end of the inlet pipe 3 is inclined towards the feed section 21, increasing the residence time and floating time of the powder inside the tube.

[0050] The exhaust assembly 4 is located in the feeding section 21. The gas input through the inlet pipe 3 includes reaction gas and carrier gas. The reaction gas reacts with the powder in the rotary kiln tube 2, and the reaction tail gas is discharged through the exhaust assembly 4.

[0051] The feeding assembly 5 is located in the feeding section 21 and is used to feed the powder into the rotating section 22 of the rotary kiln tube 2. The feeding section 21 may be slightly higher than the discharge section 23. As the rotating section 22 rotates, the powder gradually moves from the end of the rotating section 22 connected to the feeding section 21 to the end of the rotating section 22 connected to the discharge section 23. The powder reacts with the gas to form a gas-solid reactant.

[0052] The discharge assembly 6 is mounted on the support frame 1 and connected to the discharge port 27 on the discharge section 23. The gas-solid reactants fall from the rotating section 22 to the discharge port 27 and enter the discharge assembly 6 for collection.

[0053] In this embodiment, the air inlet pipe 3 extends into the rotary kiln tube 2, and the end of the air inlet pipe 3 is inclined. The reaction gas and carrier gas ejected from the air inlet pipe 3 can lift the powder accumulated at the bottom of the rotary kiln tube 2 within the tube, increasing the contact frequency between the powder and the reaction gas, thereby increasing the reaction rate and saving reaction time. The jet direction of the air inlet pipe 3 lifts the powder towards the feeding direction of the rotary kiln tube 2, increasing the residence time and floating time of the powder within the tube. This solves the problem of insufficient reaction caused by low contact frequency and short contact time between the powder and the reaction gas, and increases the uniformity of the product at various locations within the tube.

[0054] like Figure 3 As shown, in some embodiments, the portion of the air inlet pipe 3 located within the rotary kiln tube 2 is provided with multiple air jets 31. All air jets 31 are downward-facing and inclined towards the feed section 21 to further improve the uniformity of powder-gas contact.

[0055] In some embodiments, the gas-solid reaction rotary kiln 100 further includes a plurality of conveyor plates 7, which are disposed on the inner wall of the rotating section 22 of the rotary kiln tube 2. Some of the conveyor plates 7 are first conveyor plates 71, which are arranged parallel to the axis of the rotary kiln tube 2. Other conveyor plates 7 are second conveyor plates 72, which are arranged inclined relative to the axis of the rotary kiln tube 2. When the rotary kiln tube 2 rotates, the conveyor plates 7 can lift the powder to increase the contact frequency between the powder and the reactant gas, and facilitate the gradual movement of the powder towards the discharge section 23.

[0056] In some embodiments, the discharge section 23 is further provided with a slag discharge port 28, which is located away from the feed section 21 relative to the discharge port 27. The rotating section 22 includes a rotating section body 221 and a screen 222. One end of the rotating section body 221 is rotatably connected to the feed section 21, and the other end of the rotating section body 221 is rotatably connected to the discharge section 23. The screen 222 is connected to the rotating section body 221 and is located in the discharge section 23, with its end corresponding to the slag discharge port 28. The mesh diameter of the screen 222 is set according to requirements.

[0057] As the rotating section 22 rotates, the gas-solid reactants move from the rotating section body 221 onto the screen 222, and fall through the mesh of the screen 222 to the discharge port 27. Waste cannot pass through the mesh and falls through the end opening of the screen 222 to the slag discharge port 28. The slag discharge port 28 is connected to a waste bin 8 for collecting the waste.

[0058] Optionally, the distance D between the end of the screen 222 and the inner wall of the end plate of the discharge section 23 is 10-50cm.

[0059] like Figure 4 As shown, in some embodiments, the intake pipe 3 includes a fixing plate 32 and a pipe body 33. The fixing plate 32 is disposed on the discharge section 23, for example, the fixing plate 32 and the discharge section 23 are connected. The pipe body 33 is disposed on the fixing plate 32, and one end of the pipe body 33 extends into the rotary kiln tube 2. Optionally, a reinforcing rib 34 and a support plate 35 are provided between the fixing plate 32 and the pipe body 33. One end of the reinforcing rib 34 is connected to the pipe body 33, and the other end of the reinforcing rib 34 is connected to the fixing plate 32. One end of the support plate 35 is connected to the pipe body 33, and the other end of the support plate 35 is connected to the fixing plate 32. The structural strength of the intake pipe 3 is improved by the reinforcing rib 34 and the support plate 35.

[0060] In some embodiments, the exhaust assembly 4 includes a first screw feeder 41 and a dust collector 42. One end of the first screw feeder 41 is connected to the feeding section 21, and the first screw feeder 41 extends to the rotating section 22. The other end of the first screw feeder 41 is connected to the dust collector 42. Gas in the rotary kiln tube 2 enters the dust collector 42 via the first screw feeder 41. The dust collector 42 has the function of removing dust from the gas; for example, the dust collector 42 is a cyclone dust collector or a filter screen. The dust collector 42 can prevent the powder in the rotary kiln tube 2 from being discharged with the carrier gas. The dust collected by the dust collector 42 falls into the first screw feeder 41, and the first screw feeder 41 feeds the dust into the rotating section 22, reducing powder loss and improving the production recovery rate.

[0061] In some embodiments, the feeding assembly 5 comprises a hopper 51 and a second screw feeder 52. One end of the second screw feeder 52 is connected to the hopper 51, and the other end of the second screw feeder 52 is connected to the linear feeding section 21 and extends to the rotating section 22. The second screw feeder 52 is capable of conveying the powder in the hopper 51 to the rotating section 22.

[0062] In some embodiments, the discharging assembly 6 comprises a screw discharger 61 and a collector 62. One end of the screw discharger 61 is connected to the discharging port 27, and the other end of the screw discharger 61 is connected to the collector 62. The gas-solid reactants discharged from the rotary tube 2 are conveyed to the collector 62 through the screw discharger 61, and the collector 62 serves as a storage for the materials.

[0063] In some embodiments, the discharging assembly 6 further comprises a cooler (not shown in the figure) arranged on the outer wall of the screw discharger 61. For example, the cooler is a water-cooled jacket for cooling the gas-solid reactants.

[0064] In some embodiments, the gas-solid reaction rotary furnace 100 further comprises a heating assembly 9 for heating the rotary tube 2. Optionally, the heating assembly 9 comprises a heater 91 and an insulation layer 92, both of which are arranged on the support frame 1. The heater 91 is used for heating the rotary tube 2, and the insulation layer 92 is used for insulating the rotary tube 2.

[0065] Optionally, the heating assembly 9 further comprises a temperature sensor T, for example, a thermocouple, for detecting the temperature of the rotary tube 2.

[0066] The above has introduced the embodiments of the present application in detail. The principles and implementation manners of the present application are described by applying specific examples in this paper, and the above descriptions of the embodiments are only used to help understand the technical solutions and core ideas of the present application. Therefore, the changes or deformations made by the person skilled in the art according to the ideas of the present application, based on the specific implementation manners and application scope of the present application, all belong to the scope of protection of the present application. In summary, the content of the present specification should not be understood as a limitation of the present application.

Claims

1. A gas-solids reaction rotary kiln characterized by, The utility model relates to a rotary furnace, which comprises: a support frame; a rotary furnace tube arranged on the support frame, the rotary furnace tube comprising: a feeding section; a rotating section rotationally connected to one end of the feeding section; a discharging section rotationally connected to the other end of the rotating section, the discharging section being provided with a discharging port; an air inlet pipe arranged on the discharging section, the air inlet pipe extending into the rotary furnace tube, and the end of the air inlet pipe being arranged obliquely downward relative to the axis of the rotary furnace tube; an air outlet assembly arranged on the feeding section; a feeding assembly arranged on the feeding section; a discharging assembly connected to the discharging port.

2. The gas-solids reaction vessel according to claim 1, wherein The part of the air inlet pipe located in the rotary furnace tube is provided with a plurality of air injection ports.

3. The gas-solids reaction vessel according to claim 1, wherein, The utility model further comprises a plurality of strip material plates arranged on the rotating section of the rotary furnace tube, part of the strip material plates being arranged parallel to the axis of the rotary furnace tube, and the other part of the strip material plates being arranged obliquely relative to the axis of the rotary furnace tube.

4. The gas-solids reaction vessel according to claim 1, wherein The discharging section is further provided with a slag discharge port, and the rotating section comprises: a rotating section body rotationally connected to one end of the feeding section, the other end of the rotating section body being rotationally connected to the discharging section; a screen connected to the rotating section body, the screen being located in the discharging section, and the end of the screen corresponding to the slag discharge port.

5. The gas-solids reaction vessel according to claim 1, wherein, The air inlet pipe comprises: a fixed plate arranged on the discharging section; a pipe body arranged on the fixed plate, the pipe body extending into the rotary furnace tube.

6. The gas-solids reaction vessel according to claim 1, wherein, The air outlet assembly comprises: a first screw feeder connected to one end of the feeding section; a dust collector connected to the other end of the first screw feeder.

7. The gas-solids reaction vessel according to claim 1, wherein, The feeding assembly comprises: a hopper; a second screw feeder connected to one end of the hopper, the other end of the second screw feeder being connected to the feeding section.

8. The gas-solids reaction vessel according to claim 1, wherein, The discharging assembly comprises: a screw discharger connected to one end of the discharging port; a material collector connected to the other end of the screw discharger.

9. The gas-solids reaction vessel according to claim 8, wherein, The discharging assembly further comprises a cooler arranged on the outer wall of the screw discharger.

10. The gas-solids reaction vessel according to claim 1, wherein, The utility model further comprises a heating assembly for heating the rotary furnace tube.

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