Feeding device for reactor

Abstract

A feeding device for a reaction kettle, comprising: a kettle body, at least one feeding pipe, and a piston assembly; the upper and lower ends of the kettle body are each provided with at least one corresponding connection hole, and the feeding pipe is inserted through the kettle body through the connection holes at the upper and lower ends of the kettle body; the feed pipe is provided with a through hole on the side wall of the tube body at the upper end of the kettle body, and the feed pipe is provided with a plurality of discharge ports distributed from bottom to top on the tube wall of the tube body located in the kettle body; the piston assembly comprises a piston rod and a transmission device, the piston rod is arranged in the feed pipe, the upper end of the piston rod is provided with a single-ring bearing group, the lower end of the piston rod is provided with a sealing rubber sleeve, the side wall of the piston rod is provided with a rack, the transmission device comprises a gear and a motor, the gear is arranged in the through hole on the feed pipe and meshes with the rack; the discharge port of the feed pipe is connected with a check valve. The present invention solves the problem of dispersed feeding, solves the problem of excessive or uneven local concentration during the reaction process, and greatly improves the particle consistency of the precursor material.

Description

Technical Field

[0001] The invention relates to the field of lithium battery positive electrode material synthesis equipment, and in particular to a feeding device for a reaction kettle. Background Art

[0002] The lithium-ion battery industry has continued to grow rapidly, driven by the new energy industry. The development of lithium-ion batteries will inevitably require higher requirements for ensuring service life and safety. Since the higher the consistency or distribution concentration of the precursor material, the greater the impact on the safety and stability of the lithium battery, in order to obtain higher safety performance and stability of lithium batteries, higher requirements must be placed on the consistency control of the precursor material particles in the production process of lithium-ion battery materials.

[0003] In the current synthesis reaction of lithium-ion battery cathode material precursors, the feed pipe is generally fixed and supported, inserted into a certain position inside the reactor at the top of the reactor, and cannot move, or at most a movable sleeve is provided to move up and down in the sleeve to obtain simple linear movement, and most of them use a single or at most two feed pipes to feed a raw material. All such fixed feed positions or too simple feed activities cannot meet the requirements of different reactions for feed methods. Moreover, the feed port has a fixed position and a fixed caliber, which cannot match the reaction feed flow rate and the liquid level of the reaction system. Due to the reason of feeding from top to bottom, the position and diameter of the feed port are fixed, when the feed flow rate is large, the local concentration of the feed liquid at the outlet of the feed port in the reaction system is too high. The problem of local high concentration or unevenness can only be slightly improved by increasing the stirring intensity, but this problem cannot be solved; and when the feed flow rate is small, the feed liquid cannot fill the feed pipe, resulting in a slow flow rate, causing the reaction liquid to contact at the gas-liquid interface for the first time and react, which will cause the local concentration of the system to be too high or uneven, and it is difficult to improve even if the stirring intensity is increased. Therefore, the current reactor feed pipe, due to the fixed outlet, fixed diameter, feeding from top to bottom, and most of them use a single or at most two pipes to feed one raw material, which cannot meet the requirements of different reactions for feeding methods, especially the reaction of systems with changing flow and changing liquid level, which can easily lead to local high concentration or unevenness during the reaction process, thereby affecting the particle consistency of the precursor material. Summary of the invention

[0004] In view of the above-mentioned deficiencies in the prior art, the present invention provides a feeding device for a reactor.

[0005] The present invention is achieved through the following technical solutions.

[0006] A feeding device for a reaction kettle, characterized in that the device comprises: a kettle body (1), at least one feeding pipe (2), and a piston assembly; the upper end and the lower end of the kettle body (1) are each provided with at least one connecting hole corresponding to the position, and the feeding pipe (2) passes through the kettle body (1) through the connecting holes at the upper end and the lower end of the kettle body; a through hole (3) is formed on the side wall of the tube body of the feeding pipe (2) located at the upper end of the kettle body, and a plurality of discharge ports (4) distributed from bottom to top are formed on the tube wall of the feeding pipe (2) located inside the kettle body; the movable The plug assembly comprises a piston rod (5) and a transmission device. The piston rod (5) is arranged in a feed pipe (2). The upper end of the piston rod (5) is sleeved with a single-ring bearing group (6), and the lower end is sleeved with a sealing rubber sleeve (7). The side wall of the piston rod (5) is provided with a rack (8). The transmission device comprises a gear (9) and a motor (10). The gear (9) is arranged in a through hole (3) on the feed pipe (2) and meshes with the rack (8); the discharge port (4) of the feed pipe (2) is connected to a check valve (11).

[0007] Furthermore, a pipe sleeve (12) is sleeved on the pipe body of the feed pipe (2) at the connection hole provided on the kettle body, and a sealing ring (13) is provided between the pipe sleeve (12) and the outer pipe wall of the feed pipe (2).

[0008] Furthermore, the pipe sleeve (12) is connected to the feed pipe (2) via a flange.

[0009] Furthermore, the discharge port (4) of the feed pipe (2) is connected to the check valve (11) via a pipe joint (14); a check valve sleeve (15) is sleeved on the outside of the check valve (11); the check valve sleeve (15) is connected to the outer wall of the pipe joint (14); a sealing gasket is provided between the check valve (11) and the pipe joint; and a sealing ring is provided between the outer wall of the check valve (11) and the check valve sleeve (15).

[0010] Furthermore, the lower end of the feed pipe (2) is connected to the raw material feeding device via a raw material pump, and a liquid level meter (16) is provided at the lower end of the feed pipe. The liquid level meter (16) and the motor (10) are both connected to a PLC control system.

[0011] Furthermore, the inner wall of the kettle body is provided with at least one vertically arranged baffle plate (17), and the tube body of the feed pipe (2) located in the kettle body is arranged outside the baffle plate (17).

[0012] Beneficial technical effects of the present invention:

[0013] 1. The feeding device of a reactor provided by the present invention adopts a counter-gravity feeding method, that is, feeding from the lower end of the reactor upwards, a distributed feeding method within a volume range, a feeding method that matches the liquid level and flow changes, a detachable design, and modular components, which are convenient for process replacement or maintenance; the use process can be automatically controlled by PLC to meet the automation trend.

[0014] 2. The feeding device of the present invention is installed movably and adopts multiple feeding pipes for feeding. The multiple feeding pipes can be combined to match the reaction flow rate. The positions of the feed liquid outlets of the feed port are dispersed within the volume range, and can match the reaction liquid level for feeding.

[0015] 3. The number and aperture size of the discharge ports on the wall of the feed pipe can be customized; the number, aperture size and length of the check valve sleeve and check valve can be customized.

[0016] 4. Check valve design at the discharge port. There is a small check valve inside the check valve sleeve. The small check valve is used to prevent the liquid from flowing from the feed pipe to the inside of the reactor, and the reaction liquid inside the reactor cannot flow back to the liquid feed pipe. The advantage is that when the feed pipe / feed pump is abnormal, that is, the hydraulic pressure inside the feed pipe is lower than the hydraulic pressure inside the reactor, the slurry (including particulate matter) in the reactor will enter the feed pipe, which will pollute the raw materials on the one hand, and on the other hand, the particulate matter entering the feed pipe will block the feed pipe when accumulated to a certain extent.

[0017] 5. The inside of the feed pipe is a pull rod piston that can be raised and lowered to match the change in liquid level; the wall of the feed pipe is provided with multiple equidistant discharge ports for dispersing the outlet of the feed liquid; a small check valve is installed at the discharge port to prevent the feed liquid from flowing from the feed pipe to the inside of the reactor, and the reaction liquid inside the reactor cannot flow back into the feed liquid feed pipe; the small check valve is designed to be threadedly connected to the discharge hole of the feed pipe and is detachable, and can be replaced with different check valve calibers and different check valve lengths to match different feed flow rates and different feed positions; the feed pipe is designed to be detachable to facilitate the replacement of feed pipes of different calibers.

[0018] 6. The present invention solves the problem that the feeding method in the synthesis reaction of the traditional lithium-ion battery positive electrode material precursor cannot match the reaction feed flow rate and cannot match the liquid level of the reaction system. It solves the problem of dispersed feeding and the problem of excessive or uneven local concentration during the reaction process, and greatly improves the particle consistency of the precursor material. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is the front view of the structure of the present invention.

[0020] Figure 2 for Figure 1 Top view of the .

[0021] Figure 3 This is a cross-sectional view of the upper end of the feed pipe.

[0022] Figure 4 This is a cross-sectional view of the lower end of the feed pipe.

[0023] Figure 5 A schematic diagram of the structure of the piston assembly.

[0024] Figure 6 This is a cross-sectional view of the feed pipe outlet of the device in the first use state.

[0025] Figure 7 This is a cross-sectional view of the feed pipe outlet of the device in the second use state. DETAILED DESCRIPTION

[0026] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0027] like Figure 1-7 As shown, a feeding device for a reaction kettle comprises: a kettle body 1, at least one feeding pipe 2, and a piston assembly;

[0028] The upper and lower ends of the kettle body 1 are each provided with at least one connection hole corresponding to the position, the inner side wall of the kettle body 1 is provided with at least one vertical baffle 17, an overflow port 18 is provided on one side wall of the kettle body 1, a discharge pipe 19 is provided at the bottom of the kettle body 1, a stirring paddle 20 and a stirring shaft 21 are provided in the kettle body 1, the lower end of the stirring shaft 21 is connected to the stirring paddle 20, and the upper end of the stirring shaft is connected to a motor reducer 22 arranged outside the kettle body 1;

[0029] The feed pipe 2 is a vertical tube body, and the feed pipe 2 is inserted through the kettle body 1 through the connecting holes at the upper end and the lower end of the kettle body, that is, the upper part of the feed pipe 2 passes through the upper end of the kettle body 1, and the lower end of the feed pipe 2 passes through the lower end of the kettle body 1, and the middle tube body of the feed pipe 2 is located in the kettle body 1; a through hole 3 is opened on the side wall of the tube body of the feed pipe 2 located at the upper end of the kettle body, and a plurality of discharge ports 4 (including a first discharge port 28, a second discharge port 29, a third discharge port 30, a fourth discharge port 31, etc.) distributed from bottom to top are opened on the tube wall (side wall or along the circumference) of the tube body of the feed pipe 2 located in the kettle body, and the discharge port 4 of the feed pipe 2 is connected to the check valve 11. The valve 11 is connected through a pipe joint 14, a check valve sleeve 15 is sleeved on the outside of the check valve 11, the check valve sleeve 15 is connected to the outer wall of the pipe joint 14, a sealing gasket is provided between the check valve 11 and the pipe joint, and a sealing ring is provided between the outer wall of the check valve 11 and the check valve sleeve 15; the tube body of the feed pipe 2 located in the kettle body is arranged on the outside of the baffle 17; the feed pipe 2 is located at the connection hole provided in the kettle body 1 and the tube body located outside the kettle body is sleeved with a pipe sleeve 12, the pipe sleeve 12 and the feed pipe 2 are connected through a flange 23, and a sealing ring 13 is provided between the pipe sleeve 12 and the outer tube wall of the feed pipe 2;

[0030] The piston assembly includes a piston rod 5 and a transmission device. The piston rod 5 is arranged in the feed pipe 2. The upper end of the piston rod 5 is sleeved with a single-ring bearing group 6 (including multiple single-ring bearings distributed from top to bottom), and the lower end is sleeved with a sealing rubber sleeve 7. The side wall of the piston rod 5 is provided with a rack 8; the transmission device includes a gear 9 and a motor 10. The gear 9 is arranged in the through hole 3 on the feed pipe 2 and meshes with the rack 8. The gear 9 is connected to the motor 10.

[0031] The lower end of the feed pipe 2 is connected to the raw material feeding device through a raw material pump. A liquid level meter 16 (liquid level sensor) is provided at the lower end of the feed pipe. The liquid level meter 16 and the motor 10 are both connected to the PLC control system.

[0032] When in use, push the piston rod 5 inside the feed pipe 2 downward to the bottom position until its sealing rubber sleeve 7 is completely at the lower end of the first discharge port 28; start the reactor, add a small amount of bottom liquid into the reactor until the upper edge of the stirring paddle blades is submerged, and start stirring; start feeding the reactor, and after confirming the start, driven by the motor 10, the piston rod 5 moves upward, and the sealing rubber sleeve 7 reaches the lower end of the third discharge port 30, exposing the first discharge port 28 and the second discharge port 29, the motor stops moving, and the piston rod stops moving; the raw materials begin to enter the reactor from the lower end of the feed pipe through the first discharge port 28 and the second discharge port 29 to participate in the reaction. When the liquid level in the reactor rises, the liquid level meter 16 transmits real-time data, and the PLC controls the motor start and stop to control the up and down movement of the piston rod 5. When the liquid level rises to submerge the fourth discharge port 31, the data liquid level meter 16 transmits real-time data, and the PLC controls the motor to start, until the sealing rubber sleeve 7 reaches the lower end of the fourth discharge port 31, until the first discharge port 28, the second discharge port 29, and the third discharge port 30 are exposed, the motor stops moving, and the piston rod stops moving; the raw materials enter the reactor body from the first discharge port 28, the second discharge port 29, and the third discharge port 30 to participate in the reaction. Similarly, as the liquid level rises, the more discharge ports are opened, which is positively correlated with the liquid level height.

[0033] When the reaction flow rate becomes smaller, when installing the feed pipe, you can choose a small-diameter feed pipe, choose one or two feed pipes; choose a small-diameter, short-length check valve sleeve, choose a small number of check valve sleeves and check valves, and seal the extra outlets with plug sleeves; during the feeding process, selectively open a feed pipe for feeding; when the reaction flow rate becomes larger, when installing the feed pipe, you can choose a large-diameter feed pipe, choose two or more feed pipes; choose a large-diameter, long-length check valve sleeve, choose a large number of check valve sleeves and check valves; during the feeding process, selectively open two or more feed pipes for simultaneous feeding.

[0034] Example 1

[0035] Select a DN15 feed pipe, select a check valve sleeve with a φ1.6mm aperture and a length of 30mm, and select 11 check valve sleeves; install multiple feed pipes including a first feed pipe 24, a second feed pipe 25, a third feed pipe 26, and a fourth feed pipe 27 in place.

[0036] An external motor matching the gears at the upper ends of the first feed pipe 24, the second feed pipe 25, the third feed pipe 26 and the fourth feed pipe 27 is connected, and an external raw material pump pipe at the lower ends of the first feed pipe 24, the second feed pipe 25, the third feed pipe 26 and the fourth feed pipe 27 is connected, and a reaction raw material (such as a precipitating metal salt solution) is pumped into the first feed pipe 24 and the third feed pipe 26, and another raw material (such as a precipitant solution) is pumped into the second feed pipe 25 and the fourth feed pipe 27.

[0037] Select 3m 3 Add 550L of bottom liquid (such as pure water, reaction raw materials) to the reactor until the upper edge of the stirring paddle is submerged. The speed of the stirring paddle is selected to be 400r / min, and the temperature can be room temperature.

[0038] According to the installation process requirements, prepare the starting conditions: temperature, pH, bottom liquid volume and concentration, stirring speed, and 4 raw material delivery pumps; confirm that the piston rod is pushed into the lower end of the feed pipe.

[0039] Confirm the start of feeding reaction: according to the initial liquid level of the liquid level meter, the PLC controls 4 external motors to drive the piston rods of the first feed pipe 24, the second feed pipe 25, the third feed pipe 26, and the fourth feed pipe 27, and pulls the sealing rubber sleeve upward to the lower end of the third discharge port 30, leaving only the first discharge port 28 and the second discharge port 29 exposed, the motor stops moving, and the piston rod stops moving; the first feed pipe 24 and the third feed pipe 26 pump a reaction raw material (such as a precipitated metal salt solution) into the reactor body 1 through their respective first discharge ports 28 and second discharge ports 29; the second feed pipe 25 and the fourth feed pipe 27 pump another raw material (such as a precipitant solution) into the reactor body through their respective first discharge ports 28 and second discharge ports 29; the reaction starts.

[0040] When the liquid level of the reaction rises, the liquid level sensor transmits real-time data, and the PLC controls the motor start and stop to control the up and down movement of the piston rod. When the liquid level rises to submerge the fourth discharge port 31, the data liquid level sensor transmits real-time data, and the PLC controls the motor to start until the sealing rubber sleeve reaches the lower end of the fourth discharge port, until the first discharge port 28, the second discharge port 29, and the third discharge port 30 are exposed, the motor stops moving, and the piston rod stops moving; the raw materials enter the reactor body from the first discharge port 28, the second discharge port 29, and the third discharge port 30 to participate in the reaction. Similarly, as the liquid level rises, the more discharge ports are opened, the more positively correlated with the liquid level height; the final reaction liquid level reaches the overflow port, and at this point all 11 discharge ports of the feed pipe are opened, and all can flow out raw materials to participate in the reaction.

[0041] When the reaction flow is small, when installing the feed, you can select a DN15 feed pipe, a check valve sleeve with a pore size of φ1.6mm and a length of 30mm, and 6 check valve sleeves (the extra outlets are sealed with plug sleeves); install the first feed pipe 24, the second feed pipe 25, the third feed pipe 26, and the fourth feed pipe 27 in place. During the reaction process, you can select a feed pipe, the first feed pipe 24 or the third feed pipe 26 to pump in a reaction raw material (such as a precipitated metal salt solution); the second feed pipe 25 or the fourth feed pipe 27 to pump in another raw material (such as a precipitant solution).

[0042] When the reaction flow is large, when installing the feed, you can select a DN25 feed pipe, a check valve sleeve with a φ3.2mm aperture and a length of 40mm, and 11 check valve sleeves (the extra outlets are sealed with plug sleeves); install the first feed pipe 24, the second feed pipe 25, the third feed pipe 26, and the fourth feed pipe 27 in place. During the reaction process, you can select two first feed pipes 24 and the third feed pipe 26 to pump in a reaction raw material (such as a precipitated metal salt solution) at the same time; the second feed pipe 25 and the fourth feed pipe 27 can pump in another raw material (such as a precipitant solution) at the same time.

[0043] The above is only a preferred embodiment of the present invention and does not limit the invention. It should be pointed out that for ordinary technicians in this field, under the technical enlightenment provided by the present invention, other equivalent improvements can be made, all of which can achieve the purpose of the present invention and should be regarded as the protection scope of the present invention.

Claims

1. A feeding device for a reactor, characterized in that: The device comprises: a kettle body (1), at least one feed pipe (2), and a piston assembly; the upper end and the lower end of the kettle body (1) are each provided with at least one connection hole at a corresponding position, and the feed pipe (2) passes through the kettle body (1) through the connection holes at the upper end and the lower end of the kettle body; a through hole (3) is formed on the side wall of the tube body of the feed pipe (2) located at the upper end of the kettle body, and a plurality of discharge ports (4) distributed from bottom to top are formed on the tube wall of the feed pipe (2) located inside the kettle body; the piston assembly comprises a piston rod ( 5), a transmission device, wherein the piston rod (5) is arranged in the feed pipe (2), the upper end of the piston rod (5) is sleeved with a single-ring bearing group (6), and the lower end is sleeved with a sealing rubber sleeve (7), the side wall of the piston rod (5) is provided with a rack (8), and the transmission device includes a gear (9) and a motor (10), the gear (9) is arranged in a through hole (3) on the feed pipe (2) and meshes with the rack (8); the discharge port (4) of the feed pipe (2) is connected to a check valve (11); The feed pipe (2) is provided with a pipe sleeve (12) on the pipe body at the connection hole provided on the kettle body, and a sealing ring (13) is provided between the pipe sleeve (12) and the outer pipe wall of the feed pipe (2); The pipe sleeve (12) is connected to the feed pipe (2) via a flange; The discharge port (4) of the feed pipe (2) is connected to the check valve (11) via a pipe joint (14); a check valve sleeve (15) is sleeved on the outside of the check valve (11); the check valve sleeve (15) is connected to the outer wall of the pipe joint (14); a sealing gasket is provided between the check valve (11) and the pipe joint; and a sealing ring is provided between the outer wall of the check valve (11) and the check valve sleeve (15); The lower end of the feed pipe (2) is connected to the raw material feeding device via a raw material pump. A liquid level meter (16) is provided at the lower end of the feed pipe. The liquid level meter (16) and the motor (10) are both connected to a PLC control system.

2. The feeding device according to claim 1, characterized in that: The inner side wall of the kettle body is provided with at least one vertically arranged baffle plate (17), and the tube body of the feed pipe (2) located in the kettle body is arranged outside the baffle plate (17).

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