Dust settling and filtering device for tail gas of rotary kiln

Abstract

The utility model relates to the field of new energy materials, in particular to a dust settling and filtering device for tail gas of a rotary kiln, which comprises a filtering bin, a settling bin and a collecting bin which are sequentially connected from top to bottom through flanges, the settling bin is connected with a gas inlet pipe and is provided with a spiral cyclone module communicated with the gas inlet pipe, and the spiral cyclone module is connected with the collecting bin. The air inlet pipe is located in the middle of the spiral cyclone module, the center of the spiral cyclone module is communicated with the filtering bin, the filtering bin is communicated with an air outlet pipe, and tail gas enters the spiral cyclone module from the air inlet pipe, then enters the filtering bin from the center of the spiral cyclone module to be filtered and then flows out through the air outlet pipe. The spiral cyclone module is used for treating tail gas, dust settles under the action of centrifugal force, the spiral cyclone module is bent and stacked, the blown tail gas continuously acts on the inner wall of the spiral cyclone module, the dust in the tail gas is blocked and naturally falls down, and the settling effect of the dust in the tail gas is effectively improved.

Description

Technical Field

[0001] The utility model relates to the field of new energy materials, in particular to a dust settling and filtering device for rotary kiln tail gas. Background Art

[0002] Lithium-ion batteries, due to their high energy density and long lifespan, have become the primary energy source for consumer electronics and new energy vehicles. Lithium-ion battery cathode materials are primarily lithium cobalt oxide, lithium iron phosphate, and ternary materials, while negative electrode materials are primarily graphite and silicon-carbon materials. With growing market demand for batteries with high energy density and long cycle life, new preparation processes and equipment are being continuously adopted for the production of lithium battery cathode and cathode materials. Rotary kilns, due to their ability to achieve uniform temperature distribution throughout powdered materials, are increasingly being used in the production of high-performance materials, such as cathode and cathode coating and the preparation of novel silicon-carbon materials.

[0003] During the production process in a rotary kiln, positive and negative electrode powder materials are constantly swirled, raising dust. Some of this dust is carried out of the furnace by process and protective gases. Consequently, the exhaust gas from the rotary kiln contains significant amounts of dust. Since rotary kilns often use flammable and explosive process gases such as acetylene and silane, and the exhaust temperature is relatively high, conventional dust removal utilizes a cyclone dust collector combined with a bag or cartridge filter. However, this method is ineffective because the exhaust gas velocity falls below the minimum required by the cyclone. Furthermore, the fine dust in the exhaust gas is easily trapped deep within the filter bags or cartridges, making it difficult to completely remove using traditional purge technology and potentially leading to overpressure of hazardous gases.

[0004] Therefore, we developed a dust settling and filtering device for rotary kiln exhaust gas to improve the problems existing in the prior art. Utility Model Content

[0005] The purpose of the utility model is to provide a dust settling and filtering device for rotary kiln tail gas, so as to improve the problems existing in the prior art.

[0006] A dust settling and filtering device for rotary kiln exhaust gas comprises a filter bin, a sedimentation bin and a collection bin which are connected in sequence by flanges from top to bottom, the sedimentation bin being connected to an air inlet pipe, the sedimentation bin being provided with a spiral cyclone module which is connected to the air inlet pipe, the air inlet pipe being located in the middle of the spiral cyclone module, the center of the spiral cyclone module being connected to the filter bin, the filter bin being connected to an air outlet pipe, the exhaust gas entering the spiral cyclone module from the air inlet pipe, and then entering the filter bin from the center of the spiral cyclone module for filtration, and then flowing out through the air outlet pipe.

[0007] More preferably, an air intake valve is provided on the air intake pipe.

[0008] More preferably, a filter cartridge is provided in the filter chamber, and the connection point between the air outlet pipe and the filter chamber is located in the filter cartridge.

[0009] More preferably, there are at least two filter cartridges, and the number of the air outlet pipes is the same as the number of the filter cartridges.

[0010] More preferably, a fixing piece is provided in the middle of the top of the filter bin, the fixing piece is in an inverted T shape, and an elastic piece is connected between the filter cartridge and the fixing piece.

[0011] More preferably, the filter bin is provided with an ultrasonic generator, which contacts and cooperates with the adjacent filter cartridge to drive the filter cartridge to vibrate and remove dust.

[0012] More preferably, an outlet valve is provided on the outlet pipe.

[0013] More preferably, the air outlet pipe is connected to an air blowing pipe, and the air blowing pipe is used to blow gas into the filter cartridge to blow off dust from the filter cartridge.

[0014] More preferably, the air blowing pipe is provided with an air blowing valve, and the air blowing valve and the adjacent air outlet valve are opened alternately.

[0015] Compared with the prior art, the advantages of the present invention are:

[0016] The utility model adopts a spiral cyclone module which is different from the cyclone dust collector to process the exhaust gas, and does not have too many requirements on the flow rate of the exhaust gas blown in. The dust in the exhaust gas blown in will move along the spiral cyclone module. On the one hand, the dust in the exhaust gas settles under the action of centrifugal force. On the other hand, since the spiral cyclone module is curved and stacked, the exhaust gas blown in will continuously act on the inner wall of the spiral cyclone module, and the dust in the exhaust gas is blocked and falls naturally, which effectively improves the effect of dust settling in the exhaust gas.

[0017] The ultrasonic generator in the filter chamber can effectively remove dust from the filter cartridge, effectively prolonging the service life of the filter cartridge. When the wind pressure drops, the filter cartridge can be dusted by staggeredly opening the blowing valve and the adjacent exhaust valve to prevent the filter cartridge from being blocked. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the planar structure of the utility model.

[0019] Figure 2 It is a schematic diagram of the three-dimensional structure of the spiral cyclone module of the present invention.

[0020] Figure numerals: 1. Filter chamber; 11. Filter cartridge; 12. Fixing part; 13. Elastic part; 14. Ultrasonic generator; 2. Sedimentation chamber; 3. Collection chamber; 4. Flange; 5. Inlet pipe; 51 Inlet valve; 6. Spiral cyclone module; 7. Outlet pipe; 71. Outlet valve; 8. Blowing pipe; 81. Blowing valve. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention. Unless otherwise defined, the technical terms or scientific terms used herein should be the common meanings understood by people with ordinary skills in the field to which the present invention belongs. The words "including" and similar words used in this article mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects.

[0022] The present invention provides a dust settling and filtering device for rotary kiln tail gas, such as Figure 1 As shown, it includes a filter bin 1, a sedimentation bin 2 and a collection bin 3 which are connected from top to bottom by flanges 4 in sequence. The sedimentation bin 2 is connected to an air inlet pipe 5, which is connected to the exhaust gas outlet of the rotary kiln. An air inlet valve 51 is provided on the air inlet pipe 5. The sedimentation bin 2 is provided with a spiral cyclone module 6 which is connected to the air inlet pipe 5. The air inlet pipe 5 is located in the middle of the spiral cyclone module 6. The center of the spiral cyclone module 6 is connected to the filter bin 1, and the filter bin 1 is connected to the air outlet pipe 7. When the air inlet valve 51 is opened, the exhaust gas enters the spiral cyclone module 6 from the air inlet pipe 5, and is spirally rotated and risen under the action of the spiral cyclone module 6. The dust particles in the exhaust gas are decelerated in the direction close to the spiral line by the centrifugal force, and settle to the collection bin 3 below by their own gravity. A small amount of dust enters the filter bin 1 from the center of the spiral cyclone module 6 along with the exhaust gas. The filter bin 1 filters out the remaining dust in the exhaust gas, and then the exhaust gas flows out through the air outlet pipe 7.

[0023] In some embodiments, the spiral cyclone module 6 is formed by winding a whole metal plate according to an Archimedean spiral or an equivalent spiral.

[0024] In some embodiments, a filter cartridge 11 is provided in the filter chamber 1 , and the connection point between the air outlet pipe 7 and the filter chamber 1 is located in the filter cartridge 11 .

[0025] In some embodiments, there are at least two filter cartridges 11 , the filter cartridges 11 are made of stainless steel, and the number of the air outlet pipes 7 is the same as the number of the filter cartridges 11 .

[0026] In some embodiments, the filter bin 1 is provided with an ultrasonic generator 14, which contacts and cooperates with the adjacent filter cartridge 11 to drive the filter cartridge 11 to vibrate and remove dust; a fixing part 12 is provided in the middle of the top of the filter bin 1, and the fixing part 12 is an inverted T-shape. An elastic part 13 is connected between the filter cartridge 11 and the fixing part 12 to buffer the ultrasonic vibration and prevent the ultrasonic vibration from causing the filter cartridge 11 to be poorly sealed.

[0027] In some embodiments, the outlet pipe 7 is provided with an outlet valve 71, which is connected to an air blowing pipe 8 for blowing air into the filter cartridge 11 to remove dust from the filter cartridge 11. The air blowing pipe 8 is provided with an air blowing valve 81, and the air blowing valve 81 is opened alternately with the adjacent outlet valve 71. When the air pressure drops beyond a set value, the outlet valve 71 is closed and the adjacent air blowing valve 81 is opened simultaneously to perform deep dust removal on the filter cartridge 11, and then switch to the next filter cartridge 11 for deep dust removal. This reciprocating operation is repeated until the specified pressure drop is reached.

[0028] While the embodiments of the present invention have been described in detail above, it will be apparent to those skilled in the art that various modifications and variations may be made to these embodiments. However, it should be understood that such modifications and variations are within the scope and spirit of the present invention as set forth in the claims. Furthermore, the present invention described herein may have other embodiments and may be implemented or carried out in a variety of ways.

Claims

1. A dust settling and filtering device for rotary kiln exhaust gas, characterized in that: The invention comprises a filter bin (1), a sedimentation bin (2) and a collection bin (3) which are connected sequentially from top to bottom via flanges (4); the sedimentation bin (2) is connected to an air inlet pipe (5); the sedimentation bin (2) is provided with a spiral cyclone module (6) which is in communication with the air inlet pipe (5); the air inlet pipe (5) is located in the middle of the spiral cyclone module (6); the center of the spiral cyclone module (6) is in communication with the filter bin (1); the filter bin (1) is in communication with an air outlet pipe (7); the exhaust gas enters the spiral cyclone module (6) from the air inlet pipe (5), then enters the filter bin (1) from the center of the spiral cyclone module (6), is filtered, and then flows out through the air outlet pipe (7).

2. The dust settling and filtering device for rotary kiln tail gas according to claim 1, characterized in that: An air intake valve (51) is provided on the air intake pipe (5).

3. The dust settling and filtering device for rotary kiln tail gas according to claim 1, characterized in that: A filter cartridge (11) is provided in the filter chamber (1), and the connection point between the air outlet pipe (7) and the filter chamber (1) is located in the filter cartridge (11).

4. The dust settling and filtering device for rotary kiln tail gas according to claim 3, characterized in that: There are at least two filter cartridges (11), and the number of the air outlet pipes (7) is the same as the number of the filter cartridges (11).

5. The dust settling and filtering device for rotary kiln tail gas according to claim 4, characterized in that: A fixing member (12) is provided in the middle of the top of the filter bin (1), the fixing member (12) is in an inverted T-shape, and an elastic member (13) is connected between the filter cartridge (11) and the fixing member (12).

6. The dust settling and filtering device for rotary kiln tail gas according to claim 3, characterized in that: The filter bin (1) is provided with an ultrasonic generator (14), and the ultrasonic generator (14) is in contact with and cooperates with the adjacent filter cartridge (11) to drive the filter cartridge (11) to vibrate and remove dust.

7. The dust settling and filtering device for rotary kiln tail gas according to claim 4, characterized in that: An outlet valve (71) is provided on the outlet pipe (7).

8. The dust settling and filtering device for rotary kiln tail gas according to claim 7, characterized in that: The air outlet pipe (7) is connected to an air blowing pipe (8), and the air blowing pipe (8) is used to blow air into the filter cartridge (11) to blow off dust from the filter cartridge (11).

9. The dust settling and filtering device for rotary kiln tail gas according to claim 8, characterized in that: The air blowing pipe (8) is provided with an air blowing valve (81), and the air blowing valve (81) and the adjacent air outlet valve (71) are opened alternately.

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