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 rotatably arranged on the support frame; one end of the air inlet pipe is located on the outer side of the rotary furnace tube, the air inlet pipe extends into the rotary furnace tube, and a plurality of air inlet holes are formed in the part, located in the rotary furnace tube, of the air inlet pipe; and one end of the air outlet pipe is positioned in the rotary furnace pipe, and the other end of the air outlet pipe is positioned on the outer side of the rotary furnace pipe. According to the embodiment, the gas inlet pipe extends into the rotary furnace tube, the gas inlet holes are formed in the gas inlet pipe, gas sprayed out of the gas inlet pipe can raise powder in the rotary furnace tube, the contact frequency of the powder and reaction gas is increased, and therefore the reaction rate and the reaction uniformity are increased.

Description

Technical Field

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

[0002] Many powder material industries, such as lithium-ion battery positive and negative electrode materials and coating fillers, require vapor-phase surface treatment or infiltration treatment of the corresponding powder materials. Conventional rotary furnaces or kilns, however, have limited material loading capacity. At normal production speeds, material-gas contact is limited, resulting in slow and uneven reactions. Increasing the kiln speed to increase powder lift and contact between the powder and gas will only marginally improve the reaction rate and uniformity of the material with the gas. Furthermore, powder loss with gas blow-off will increase, resulting in a lower final yield and poor economic benefits. Therefore, existing gas-solid reaction rotary furnaces still have room for improvement. Utility Model Content

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

[0004] One embodiment of the present application provides a gas-solid reaction rotary kiln, comprising:

[0005] Support frame;

[0006] a rotary furnace tube rotatably disposed on the support frame;

[0007] an air inlet pipe, one end of which is located outside the rotary furnace tube, the air inlet pipe extending into the rotary furnace tube, and a portion of the air inlet pipe located in the rotary furnace tube being provided with a plurality of air inlet holes;

[0008] An air outlet pipe has one end located inside the rotary furnace tube, and the other end located outside the rotary furnace tube.

[0009] According to some embodiments of the present application, a plurality of strips are provided inside the rotary furnace tube, some of the strips are arranged parallel to the axis of the rotary furnace tube, and other strips are arranged inclined relative to the axis of the rotary furnace tube.

[0010] According to some embodiments of the present application, one end of the rotary furnace tube has a detachable tube plug.

[0011] According to some embodiments of the present application, the air inlet pipe penetrates the rotary furnace tube from the closed end of the rotary furnace tube;

[0012] The air outlet pipe passes through the pipe plug.

[0013] According to some embodiments of the present application, the gas-solid reaction rotary kiln further includes a pressure gauge connected to the air inlet pipe, and the air inlet pipe includes:

[0014] tube body;

[0015] The reinforcing ribs are arranged on the tube body.

[0016] According to some embodiments of the present application, the gas-solid reaction rotary kiln further includes a filter element disposed at the end of the gas outlet pipe.

[0017] According to some embodiments of the present application, the air outlet pipe is provided with a back-blowing air inlet.

[0018] According to some embodiments of the present application, the support frame includes:

[0019] base;

[0020] The frame is rotatably connected to the base, and the rotary furnace tube is arranged on the frame.

[0021] According to some embodiments of the present application, the framework includes:

[0022] a lower frame, wherein the rotary furnace tube is arranged on the lower frame;

[0023] The upper frame is rotatably connected to the lower frame.

[0024] According to some embodiments of the present application, the gas outlet pipe passes through the rotary furnace tube;

[0025] The air inlet pipe portion is located in the air outlet pipe.

[0026] According to some embodiments of the present application, a sleeve is provided at the closed end of the rotary furnace tube, and both the air inlet pipe and the air outlet pipe pass through the sleeve.

[0027] Beneficial effects of the gas-solid reaction rotary kiln of this application:

[0028] 1. Extending the air inlet pipe into the rotary furnace tube can quickly deliver the reaction gas into the rotary furnace tube. The reaction gas and carrier gas ejected from the air inlet pipe can lift the powder to be processed in the furnace tube, increasing the contact frequency between the powder and the reaction gas, thereby increasing the reaction rate and saving reaction time;

[0029] 2. The air inlet pipe is equipped with multiple air inlets. The gas ejected from the air inlet pipe will reduce the dead corners where powder accumulates in the furnace, avoiding the problem of insufficient reaction caused by low contact frequency and short contact time between powder and reaction gas in the dead corners, thereby increasing the uniformity of products at various positions in the furnace tube;

[0030] 3. The filter screen of the air outlet pipe can prevent the material in the furnace tube from being discharged from the furnace tube along with the carrier gas, thereby improving the yield of each batch of production and reducing the loss of powder;

[0031] 4. Increase the charging capacity of the rotary furnace tube and increase the production capacity of a single furnace;

[0032] 5. The upper frame of the frame can be lifted up to increase the heat dissipation speed of the rotary furnace tube, shorten the single batch processing time and improve production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solution of the present application, the following is a brief introduction to the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without exceeding the scope of protection required by this application.

[0034] Figure 1 Schematic diagram of a gas-solid reaction rotary furnace according to an embodiment of the present application;

[0035] Figure 2 is a schematic diagram of an intake pipe according to an embodiment of the present application;

[0036] Figure 3 Schematic diagram of a rotary furnace tube according to an embodiment of the present application;

[0037] Figure 4 Schematic diagram of the air outlet pipe according to an embodiment of the present application;

[0038] Figure 5 is a schematic diagram of a support frame according to an embodiment of the present application;

[0039] Figure 6 This is a schematic diagram of an embodiment of the air inlet pipe and the air outlet pipe of the present application;

[0040] Figure 7 This is a schematic diagram of another implementation of the air inlet pipe and the air outlet pipe in an embodiment of the present application. DETAILED DESCRIPTION

[0041] The following is a clear and complete description of the technical solution of this application in conjunction with the drawings in the embodiments of this application. Obviously, the embodiments described are part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without making any creative efforts are within the scope of protection of this application.

[0042] like Figure 1 As shown, an embodiment of the present application provides a gas-solid reaction rotary furnace 100 , comprising a support frame 1 , a rotary furnace tube 2 , an air inlet pipe 3 , and an air outlet pipe 4 .

[0043] The support frame 1 provides support for the rotary furnace tube 2, which is rotatably mounted on the support frame 1. For example, the rotary furnace tube 2 can rotate about a horizontal axis. A motor M is mounted on the support frame 1, driving the rotary furnace tube 2 via a mechanical transmission mechanism such as a gear or chain. The interior of the rotary furnace tube 2 is a material chamber.

[0044] like Figure 2 As shown, one end of the air inlet pipe 3 is located outside the rotary furnace tube 2, and the other end of the air inlet pipe 3 enters the material cavity of the rotary furnace tube 2. The portion of the air inlet pipe 3 located within the rotary furnace tube 2 is provided with multiple air inlet holes 31. Optionally, within the rotary furnace tube 2, at least a portion of the air inlet pipe 3 extends substantially parallel to the axis of the rotary furnace tube 1, and the multiple air inlet holes 31 are sequentially arranged on the wall of the air inlet pipe 3. The diameter of the air inlet holes 31 is set as required.

[0045] like Figure 1 As shown, one end of the gas outlet pipe 4 is located in the material cavity of the rotary furnace tube 2 , and the other end of the gas outlet pipe 4 extends to the outside of the rotary furnace tube 2 .

[0046] The air inlet pipe 3 and the air outlet pipe 4 are respectively connected to a fixing frame (not shown in the figure), and the air inlet pipe 3 and the air outlet pipe 4 do not rotate along with the rotary furnace tube 2.

[0047] After the powder is added to the rotary furnace tube 2, the motor is started to drive the rotary furnace tube 2 to rotate. Gas is introduced into the rotary furnace tube 2 through the inlet pipe 3. The gas conveyed by the inlet pipe 3 is a reaction gas or a mixture of reaction gas and carrier gas. The reaction gas contacts and reacts with the powder in the rotary furnace tube 2. The remaining exhaust gas is discharged from the rotary furnace tube 2 through the outlet pipe 4. The exhaust gas includes at least one of gaseous reaction products, unreacted reaction gas, and carrier gas.

[0048] In this embodiment, an air inlet pipe 3 extends into the rotary furnace tube 2 and is provided with multiple air inlet holes 31. The gas ejected from the air inlet pipe 3 lifts the powder in the rotary furnace tube 2, increasing the frequency of contact between the powder and the reaction gas, thereby increasing the reaction rate and uniformity. The gas ejected from the air inlet pipe 3 reduces dead corners in the rotary furnace tube 2 where powder can accumulate, preventing the problem of insufficient reaction caused by low frequency and short contact time between the powder and the reaction gas in these dead corners. This improves product uniformity at all locations within the rotary furnace tube 2.

[0049] like Figure 3 As shown, the rotary furnace tube 2 is equipped with multiple strips 21. These strips 21 are mounted on the inner wall of the rotary furnace tube 2. Some strips 21 are parallel to the axis of the rotary furnace tube 2, while others are tilted relative to the axis. The size and tilt angle of the strips 21 are customized. As the rotary furnace tube 2 rotates, the strips 21 lift the powder, increasing the frequency of contact between the powder and the reaction gas.

[0050] In some embodiments, the rotary furnace tube 2 includes a pipe plug 22 and a furnace body 25. The furnace body 25 includes a closed end 2a and an open end 2b. Powdered materials are fed into or out of the furnace body 25 through the opening of the open end 2b. The pipe plug 22 is detachably connected to the furnace body 25 and can seal the opening of the open end 2b, facilitating the feeding and discharge of powdered materials into or out of the furnace body 25.

[0051] In some embodiments, the air inlet pipe 3 penetrates the rotary furnace tube 2 from the closed end 2a of the rotary furnace tube 2. For example, a first mechanical seal structure 23 is provided at the closed end 2a of the furnace body 25, and one end of the air inlet pipe 3 passes through the first mechanical seal structure 23 and enters the furnace body 25.

[0052] The gas outlet pipe 4 passes through the pipe plug 22. Optionally, the pipe plug 22 includes a pipe plug body 221 and a gas outlet sleeve 223. The pipe plug body 221 can seal the opening of the open end 2b of the furnace body 25. The gas outlet sleeve 223 is mounted on the pipe plug body 221 via a second mechanical seal structure and can communicate with the cavity of the furnace body 25. The gas outlet pipe 4 passes through the gas outlet sleeve 223 and enters the furnace body 25.

[0053] Optionally, a sealing cap 224 is provided at the end of the outlet sleeve 223, and the outlet pipe 4 is sealedly connected to the sealing cap 224. A heat insulation cavity 225 is provided inside the pipe plug body 221 to improve the heat insulation performance of the pipe plug 22.

[0054] Optionally, a gear 24 is provided at the closed end 2 a of the rotary furnace tube 2 , and the gear 24 is connected to another gear at the output end of the motor to drive the rotary furnace tube 2 to rotate.

[0055] like Figure 2 As shown, in some embodiments, the gas-solid reaction rotary kiln 100 further includes a pressure gauge 5 connected to the air inlet pipe 3 to detect the pressure of the gas transported in the air inlet pipe 3. The air inlet pipe 3 includes a pipe body 32 and a reinforcing rib 33. An air inlet hole 31 is provided on the pipe body 32. The reinforcing rib 33 is provided on the pipe body 32 to prevent the air inlet pipe 3 from deforming and sagging under high temperature.

[0056] In the vertical direction, the horizontal portion of the air inlet pipe 3 inside the rotary furnace tube 2 is lower than the axis of the rotary furnace tube 2, and the minimum distance between the horizontal portion of the air inlet pipe 3 inside the rotary furnace tube 2 and the horizontal side wall of the rotary furnace tube 2 is greater than the height of the strip plate 21 to avoid interference between the air inlet pipe 3 and the strip plate 21.

[0057] like Figure 4As shown, in some embodiments, the gas-solid reaction rotary kiln 100 further includes a filter element 6, which is disposed at the end of the outlet pipe 4 within the rotary kiln tube 2. The filter element 6 filters the powdered material, preventing it from entering the outlet pipe 4. Optionally, the filter element 6 is disposed near the top of the rotary kiln tube 2, but interference between the filter element 6 and the feed plate 21 should be avoided. The exhaust port of the outlet pipe 4 is connected to an exhaust gas treatment device.

[0058] In some embodiments, the gas outlet pipe 4 is provided with a back-blowing air inlet 42. The back-blowing air inlet 42 is located outside the rotary furnace tube 2. By delivering gas into the back-blowing air inlet 42 through the back-blowing air inlet 42, the gas outlet pipe 4 can be back-blown and cleaned.

[0059] like Figure 5 As shown, in some embodiments, the support frame 1 includes a base 11 and a frame 12. The base 11 includes a base body 111 and a first drive cylinder 113. The rotary furnace tube 2 is mounted on the frame 12. The frame 12 is rotatably connected to the base body 111 at one end thereof, near the open end 2b of the rotary furnace tube filter element 62. For example, the frame 12 is connected to the base body 111 via a rotating shaft 112. The first drive cylinder 113 is disposed at one end of the base body 111, near the closed end 2a of the rotary furnace tube 2. The telescopic rod of the first drive cylinder 113 is connected to the frame 12 to drive the frame 12 to rotate. Optionally, the first drive cylinder 113 is a hydraulic cylinder.

[0060] The first driving cylinder 113 can drive one end of the frame 12 to lift up, so that the closed end 2a of the rotary furnace tube 2 rotates upward, and the rotary furnace tube 2 tilts, which facilitates the discharge of the rotary furnace tube 2.

[0061] In some embodiments, the frame 12 includes a lower frame 121 and an upper frame 122. The lower frame 121 is mounted on the support frame 1, and the rotary furnace tube 2 is rotatably mounted on the lower frame 121. For example, a first bearing 126 and a second bearing 129 are respectively mounted on the lower frame 121. The first bearing 126 and the second bearing 129 are both adapted to fit the rotary furnace tube 2, facilitating the rotation of the rotary furnace tube 2 by the motor M.

[0062] The upper frame 122 is rotatably connected to the lower frame 121. For example, the end of the upper frame 122 near the open end 2b of the rotary furnace tube 2 is connected to the lower frame 121 via a rotating shaft 123. A second drive cylinder 127 is provided at the end of the lower frame 121 near the closed end 2a of the rotary furnace tube 2. The telescopic rod of the second drive cylinder 127 is connected to the upper frame 122 to drive the end of the upper frame 122 near the closed end 2a of the rotary furnace tube 2 to lift. Lifting the end of the upper frame 122 near the closed end 2a of the rotary furnace tube 2 facilitates heat dissipation from the rotary furnace tube 2.

[0063] Optionally, both the lower frame 121 and the upper frame 122 are provided with a heater 124 and a heat-insulating layer 125. The heater 124 can be an existing heater, and the heat-insulating layer 125 can be an existing heat-insulating layer. The heater 124 is used to heat the rotary furnace tube 2.

[0064] Optionally, both the lower frame 121 and the upper frame 122 are provided with thermocouples 128 , and the thermocouples 128 are used to detect the temperature of the rotary furnace tube 2 .

[0065] like Figure 6 As shown, in some embodiments, the air inlet pipe 3 and the air outlet pipe 4 are both disposed at one end of the rotary furnace tube 2. For example, both the air inlet pipe 3 and the air outlet pipe 4 are disposed at the closed end 2a of the rotary furnace tube 2. The air outlet pipe 4 passes through the closed end 2a of the rotary furnace tube 2. For example, the air outlet pipe 4 is connected to the rotary furnace tube 2 via a third mechanical seal structure. The air inlet pipe 3 is partially located within the air outlet pipe 4. The inner diameter of the air outlet pipe 4 is larger than the outer diameter of the air inlet pipe 3. The air inlet pipe 3 partially nests within the air outlet pipe 4, and the air inlet pipe 3 passes through the air outlet pipe 4 and enters the rotary furnace tube 2. Partially disposing the air inlet pipe 3 within the air outlet pipe 4 helps reduce the space occupied by the air inlet pipe 3 and the air outlet pipe 4.

[0066] As above Figure 7 As shown, in some embodiments, a sleeve 7 is provided at the closed end 2a of the rotary furnace tube 2, one end of which extends into the rotary furnace tube 2. A fourth mechanical seal is provided between the sleeve 7 and the rotary furnace tube 2. The air inlet pipe 3 and the air outlet pipe 4 both pass through the sleeve 7 and enter the rotary furnace tube 2.

[0067] Optionally, each mechanical sealing mechanism in this embodiment uses an existing mechanical seal.

[0068] The embodiments of the present application are described in detail above. Specific examples are used herein to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only intended to help understand the technical solutions and core concepts of the present application. Therefore, changes or modifications made by those skilled in the art based on the concepts of the present application, the specific implementation methods, and the scope of application of the present application, all fall within the scope of protection of the present application. In summary, the contents of this specification should not be construed as limiting the present application.

Claims

1. A gas-solid reaction rotary furnace, characterized in that: include: Support frame; a rotary furnace tube rotatably disposed on the support frame; an air inlet pipe, one end of which is located outside the rotary furnace tube, the air inlet pipe extending into the rotary furnace tube, and a portion of the air inlet pipe located in the rotary furnace tube being provided with a plurality of air inlet holes; An air outlet pipe has one end located inside the rotary furnace tube, and the other end located outside the rotary furnace tube.

2. The gas-solid reaction rotary furnace according to claim 1, characterized in that: A plurality of strips are arranged inside the rotary furnace tube, a portion of the strips are arranged parallel to the axis of the rotary furnace tube, and another portion of the strips are arranged obliquely relative to the axis of the rotary furnace tube.

3. The gas-solid reaction rotary furnace according to claim 1, characterized in that: One end of the rotary furnace tube is provided with a detachable tube plug.

4. The gas-solid reaction rotary furnace according to claim 3, characterized in that: The air inlet pipe penetrates into the rotary furnace tube from the closed end of the rotary furnace tube; The air outlet pipe passes through the pipe plug.

5. The gas-solid reaction rotary furnace according to claim 1, characterized in that: It also includes a pressure gauge connected to the air intake pipe, and the air intake pipe includes: tube body; The reinforcing ribs are arranged on the tube body.

6. The gas-solid reaction rotary furnace according to claim 1, characterized in that: It also includes a filter element, which is arranged at the end of the air outlet pipe.

7. The gas-solid reaction rotary furnace according to claim 6, characterized in that: The air outlet pipe is provided with a back-blowing air inlet.

8. The gas-solid reaction rotary furnace according to claim 1, characterized in that: The support frame comprises: base; The frame is rotatably connected to the base, and the rotary furnace tube is arranged on the frame.

9. The gas-solid reaction rotary furnace according to claim 8, characterized in that: The framework includes: a lower frame, wherein the rotary furnace tube is arranged on the lower frame; The upper frame is rotatably connected to the lower frame.

10. The gas-solid reaction rotary furnace according to claim 1, characterized in that: The gas outlet pipe passes through the rotary furnace tube; The air inlet pipe portion is located in the air outlet pipe.

11. The gas-solid reaction rotary furnace according to claim 1, characterized in that: The closed end of the rotary furnace tube is provided with a sleeve, and the air inlet pipe and the air outlet pipe both pass through the sleeve.

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