Design method of high-mix discharge door air blowing device for positive electrode material production

Abstract

The present invention provides a design method for a high-mix discharge gate blowing device for cathode material production, comprising: obtaining the flow velocity and corresponding flow rate of each air outlet in an existing high-mix discharge gate blowing device, with the diameter of the blowing pipe, the pressure in the pipe, and the diameter of the air outlet being constant; obtaining the flow rate of each air outlet at different strip widths H under the condition of maintaining the flow rate. n The first flow rate under the condition of maintaining the flow rate is greater than or equal to the set threshold value V0 to meet the purge condition; under the condition of maintaining the flow rate, obtain the outlet area H of different strips n *L m The second flow rate under the second flow rate is greater than or equal to the set threshold V0 to meet the purge condition, L m is the length of the long strip outlet, R n is the width of the long strip air outlet; obtain the area H of different long strip air outlets n *L m Different deformation variables ΔX under i , get the deformation variable ΔX i The long strip outlet H that satisfies the maximum area of ​​the standard deformation variable ΔX0 max *L max Output as the optimal outlet.

Description

Technical Field

[0001] The invention relates to a design method for a high-mix discharge door air blowing device, in particular to a design method for a high-mix discharge door air blowing device used for positive electrode material production. Background Art

[0002] During the production process of lithium battery positive electrode materials, high-speed mixers are used for mixing. High-speed mixers are efficient and fast, but they are prone to generating dust, which can easily lift up smaller and lighter particles and gather them in the upper layer or even stick to the bottom of the lid. Large and heavy particles cannot be fully mixed with small and light particles, resulting in uneven mixing. Therefore, it is necessary to design a corresponding blowing device according to the production process to blow the discharge door regularly. However, the blowing impact force of the current blowing device is large, and during the blowing process, the discharge door and the sealing ring will be blown out of the groove, resulting in the risk of cavitation on the high-speed mixer discharge door and reduced sealing performance. Summary of the Invention

[0003] The present invention provides a design method for a high-mix discharge door air blowing device, which can effectively solve the technical problem of "cavitation risk and reduced sealing performance of the high-mix machine discharge door".

[0004] The present invention is achieved in that:

[0005] A method for designing a high-mix discharge door air blowing device for positive electrode material production includes the following steps:

[0006] S1, obtaining the flow velocity V2 and the corresponding flow rate Q of each air outlet in the existing high-mix discharge door air blowing device, wherein the existing high-mix discharge door air blowing device includes an air blowing pipe and multiple air outlets provided on the air blowing pipe, and the pipe diameter φ of the existing air blowing pipe, the existing pressure P1 in the pipe, and the diameter R of the existing air outlet are constant;

[0007] S2, under the condition of maintaining the flow rate Q, obtain the width H of the air outlet at different strips n A first flow rate V1 under the above conditions, wherein the first flow rate V1 is greater than or equal to a set threshold V0 to satisfy the purge condition;

[0008] S3, under the condition of maintaining the flow rate Q, obtain the outlet area H of different strips n *L m The second flow rate V2 under the condition of L is greater than or equal to the set threshold value V0 to meet the purge condition. m is the length of the strip outlet, R n is the width of the long strip air outlet;

[0009] S4, obtain the area H of different strip outlets n *Lm Different deformation variables ΔX under i , get the deformation variable ΔX i The long strip outlet H that satisfies the maximum area of ​​the standard deformation variable ΔX0 max *L max , H max *L max As the optimal air outlet output, the optimal air outlet is used to avoid the risk of cavitation on the discharge door and the sealing ring.

[0010] The beneficial effects of the present invention are as follows: The purge device designed using this method, while ensuring effective blowing, disperses the gas outflow direction (by changing the blowing port structure from a circular to an elongated strip and optimizing its dimensions), slowing the blowing velocity and reducing the instantaneous pressure of the injection, thereby effectively avoiding the risk of cavitation on the discharge door and sealing ring, thereby extending their service life and maintenance intervals. Furthermore, this design method can be rationally optimized for different equipment models. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0012] Figure 1 This is a photo of the air outlet of the high-mix discharge door air blowing device in the prior art (shown in the box).

[0013] Figure 2 This is a flow chart of a design method for a high-mix discharge door blowing device for positive electrode material production provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0014] 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 in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of 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. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the invention for which protection is sought, but merely represents selected embodiments of the present invention. Based on the embodiments of 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.

[0015] In the description of the present invention, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "plurality" means two or more, unless otherwise specifically defined.

[0016] See Figure 2 The embodiment of the present invention provides a method for designing a high-mix discharge door air blowing device for positive electrode material production, comprising the following steps:

[0017] S1, obtaining the flow velocity V2 and the corresponding flow rate Q of each air outlet in the existing high-mix discharge door air blowing device, wherein the existing high-mix discharge door air blowing device includes an air blowing pipe and multiple air outlets provided on the air blowing pipe, and the pipe diameter φ of the existing air blowing pipe, the existing pressure P1 in the pipe, and the diameter R of the existing air outlet are constant;

[0018] S2, under the condition of maintaining the flow rate Q, obtain the width H of the air outlet at different strips n A first flow rate V1 under the above conditions, wherein the first flow rate V1 is greater than or equal to a set threshold V0 to satisfy the purge condition;

[0019] S3, under the condition of maintaining the flow rate Q, obtain the outlet area H of different strips n *L m The second flow rate V2 under the condition of L is greater than or equal to the set threshold value V0 to meet the purge condition. m is the length of the long strip outlet, H n is the width of the long strip air outlet;

[0020] S4, obtain the area H of different strip outlets n *Lm Different deformation variables ΔX under i , get the deformation variable ΔX i The long strip outlet H that satisfies the maximum area of ​​the standard deformation variable ΔX0 max *L max , H max *L max As the optimal air outlet output, the optimal air outlet is used to avoid the risk of cavitation on the discharge door and the sealing ring.

[0021] In step S1, the main purpose is to obtain various parameters of the high-mix discharge door blowing device in the existing technology, and to carry out subsequent optimization design based on these parameters. Figure 1 As a further improvement, in one embodiment, in step S1, the diameter φ of the existing air blowing pipe is 8 mm, the pressure P1 in the existing pipe is 0.4 MPa, and the diameter R of the existing air outlet is 1 mm.

[0022] Specifically, according to the Bernoulli equation P1+1 / 2*ρV1 2 +ρ*g*h1= P2+1 / 2*ρV2 2 +ρ*g*h2 to obtain the flow velocity V2 and its corresponding flow rate Q of each air outlet in the existing high-mix discharge door blowing device, where P2 is the outlet pressure of 0 MPa, and the height difference in the pipeline is ignored, the density of air ρ is 1.29 kg / m³; according to the flow table of circular apertures under different pressures, the flow rate can be found to be 2.97 m³ / min (that is, according to the table of circular apertures under different pressures, the flow rate of diameter 8 is 2.97 m³ / min=0.05 m³ / s at 0.4 MPa), the pipe has a nominal diameter of 8 mm and an inner diameter of 7.4 mm. According to the flow rate conversion formula Q=S*V*3600, the flow rate in the pipe is 0.328 m / s; then according to the Bernoulli equation P+1 / 2*ρ*V²+ρ*g*h=C; the height difference remains unchanged, and the flow velocity V2 at the outlet can be calculated to be 787.5 m / s, and the flow rate Q is 2.2266 m³ / h.

[0023] Steps S2 and S3 are mainly used to optimize the size of the purge hole and other parameters under the existing purge conditions. As a further improvement, in step S2, under the condition of keeping the flow rate Q at 2.2266m³ / h, the width H of the air outlet in different strips is obtained. nThe first flow rate V1 under the condition of purging is met. Further, according to Article 9.3.1 of GB 50235-2010, the pipeline purge flow rate should not be less than 20 meters per second. Therefore, the threshold value V0 is set to 20m / s. The aperture length is 5mm, and the blowing rectangle with varying widths confirms different flow rates according to different widths. According to Article 9.3.1 of GB 50235-2010, the pipeline purge flow rate should not be less than 20 meters per second. This condition is used to determine whether the width meets the requirement. As a further improvement, in one embodiment, the width H of the long strip air outlet is obtained. n The range is 2mm~6mm.

[0024] As a further improvement, in one embodiment, in step S3, the length L of the long strip air outlet is calculated according to the above equation. m The range is 4mm~6mm.

[0025] Step S4 is mainly used to optimize and design the best size parameters of the purge hole under the existing purge conditions. As a further improvement, in step S4, the range of the standard deformation variable ΔX0 is within 0.500mm. According to the width H of the long strip outlet n The range is 2mm~6mm and the length L m The range of 4mm~6mm is used to obtain different strip outlet areas H n *L m Different deformation variables ΔX under i , take different deformation variables ΔX i The maximum area of ​​the long strip outlet H is less than or equal to 0.500mm max *L max As the optimal outlet output. In one embodiment, H max *L max =2mm*5mm as the optimal air outlet output.

[0026] As a further improvement, in one embodiment, the design method further includes:

[0027] Control the pressure P in the pipeline after different designs 1i , obtain the optimal outlet H max *L max Pressure P in the pipeline after different designs 1i The deformation variable ΔX under ip , get the optimal outlet H max *L max Pressure P in the pipeline after different designs 1i The deformation variable ΔX under ip The maximum pipe pressure P that meets the standard deformation ΔX0 1max , P1max The optimal pipeline pressure is output. The above process can be simulated and calculated using software such as CATIA and will not be repeated here. In one embodiment, the deformation gradually increases at a pressure of 0.3 to 0.8 MPa. Preferably, a pressure of 0.3 to 0.5 MPa is applied.

[0028] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. A design method for a high-mix discharge door blowing device for positive electrode material production, characterized in that: The following steps are involved: S1, obtaining the flow velocity V2 and the corresponding flow rate Q of each air outlet in the existing high-mix discharge door air blowing device, wherein the existing high-mix discharge door air blowing device includes an air blowing pipe and multiple air outlets provided on the air blowing pipe, and the pipe diameter φ of the existing air blowing pipe, the existing pressure P1 in the pipe, and the diameter R of the existing air outlet are constant; S2, under the condition of maintaining the flow rate Q, obtain the width H of the air outlet at different strips n A first flow rate V1 under the above conditions, wherein the first flow rate V1 is greater than or equal to a set threshold V0 to satisfy the purge condition; S3, under the condition of maintaining the flow rate Q, obtain the outlet area H of different strips n *L m The second flow rate V2 under the condition of L is greater than or equal to the set threshold value V0 to meet the purge condition. m is the length of the long strip air outlet; S4, obtain the area H of different strip outlets n *L m Different deformation variables ΔX under i , get the deformation variable ΔX i The long strip outlet H that satisfies the maximum area of ​​the standard deformation variable ΔX0 max *L max , H max *L max As the optimal air outlet output, the optimal air outlet is used to avoid the risk of cavitation on the discharge door and the sealing ring.

2. The design method of the high-mix discharge door blowing device for positive electrode material production according to claim 1, characterized in that: In step S1 , the diameter φ of the existing air blowing pipe is 8 mm, the pressure P1 in the existing pipe is 0.4 MPa, and the diameter R of the existing air outlet is 1 mm.

3. The design method of the high-mix discharge door blowing device for positive electrode material production according to claim 2, characterized in that: In step S1, according to the Bernoulli equation P1+1 / 2*ρV1 2 +ρ*g*h1= P2+1 / 2*ρV2 2 +ρ*g*h2 obtains the flow velocity V2 and its corresponding flow rate Q of each air outlet in the existing high-mix discharge door blowing device, where P2 is the outlet pressure of 0 MPa; and the height difference in the pipeline is ignored.

4. The design method of the high-mix discharge door air blowing device for positive electrode material production according to claim 3, characterized in that: In step S2, the threshold V0 is set to 20 m / s.

5. The design method of the high-mix discharge door air blowing device for positive electrode material production according to claim 4, characterized in that: Width of the long strip air outlet H n The range is 2mm~6mm.

6. The design method of the high-mix discharge door air blowing device for positive electrode material production according to claim 5, characterized in that: Length of the long strip air outlet L m The range is 4mm~6mm.

7. The design method of the high-mix discharge door air blowing device for positive electrode material production according to claim 4, characterized in that: In step S4 , the range of the standard deformation amount ΔX0 is within 0.500 mm.

8. The method for designing a high-mix discharge door air blowing device for cathode material production according to claim 5, characterized in that: Further including: Control the pressure P in the pipeline after different designs 1i , obtain the optimal outlet H max *L max Pressure P in the pipeline after different designs 1i The deformation variable ΔX under ip , get the optimal outlet H max *L max Pressure P in the pipeline after different designs 1i The deformation variable ΔX under ip The maximum pipe pressure P that meets the standard deformation ΔX0 1max , P 1max Output as optimal pipeline pressure.

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