Tail gas treatment device of silicon-carbon cathode fluidized bed

Abstract

The utility model discloses a tail gas treatment device of a silicon-carbon cathode fluidized bed. The tail gas treatment device comprises an exhaust mechanism and a liquid sealing mechanism, the exhaust mechanism comprises a mounting box and a top exhaust cylinder; a first exhaust port is formed in the top wall of the mounting box, and a second exhaust port is formed in the lower part of the side wall of the mounting box; the top exhaust cylinder is vertically mounted outside the mounting box in an extending manner, and the top exhaust cylinder communicates with the mounting box through the first exhaust port; the liquid sealing mechanism comprises a liquid sealing barrel, a bubble breaking net and an air inlet pipe; the liquid sealing barrel is arranged in the mounting box, and the bubble breaking net is arranged in the liquid sealing barrel; the gas inlet end of the gas inlet pipe is connected with the tail gas outlet, and the gas outlet end of the gas inlet pipe is arranged in the liquid seal barrel. According to the tail gas treatment device of the silicon-carbon negative electrode fluidized bed, a part of hydrogen, acetone and carbon powder in tail gas are absorbed by alkali liquor in the liquid sealing barrel, so that the concentration of acetone and hydrogen in the tail gas is reduced; and then high-altitude emission of hydrogen in tail gas is achieved through the top exhaust funnel, and potential safety hazards are reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to silicon carbon negative electrode material production preparation technical field especially, a kind of tail gas treatment device of silicon carbon negative electrode fluidized bed. BACKGROUND

[0002] Lithium-ion batteries have been widely used in recent years in portable electronic devices, large-scale energy storage devices, electric vehicles and other fields. Compared with the graphite anode commonly used in lithium-ion batteries, silicon material has ultra-high theoretical specific capacity and low delithiation potential, which makes silicon material one of the potential choices for upgrading and replacing carbon-based anodes of lithium-ion batteries. However, as a semiconductor material, silicon has low electrical conductivity. During electrochemical cycling, the insertion and extraction of lithium ions can cause the material to expand and contract by more than 300%, generating mechanical forces that can gradually pulverize the material and cause structural collapse, ultimately leading to the separation of the electrode active material from the current collector and the loss of electrical contact, resulting in a significant reduction in battery cycle performance. In addition, due to this volume effect, silicon is difficult to form a stable solid electrolyte interface (SEI) film in the electrolyte. With the destruction of the electrode structure, new SEI films are continuously formed on the exposed silicon surface, exacerbating the corrosion and capacity decay of silicon.

[0003] In the prior art, silane gas is commonly used as the silicon source, and porous carbon is used as the carrier to prepare silicon-carbon negative electrode materials. Specifically, the porous carbon carrier is placed in a fluidized bed reaction unit, then nitrogen gas is introduced to remove oxygen, and then the temperature is raised to a specified temperature, and an appropriate amount of silane gas is introduced. The gas flow is used to fluidize the porous carbon, and in this process, the gas is simultaneously adsorbed. Due to the high activity of silane, nanosilicon generated by the dehydrogenation of silane at this temperature is deposited in the porous carbon carrier, forming a new type of negative electrode material combined with silicon and carbon.

[0004] The tail gas of the silicon-carbon negative electrode fluidized bed generally includes reactants (such as carbon powder) and reaction by-products (such as hydrogen, acetone, etc.). Currently, the tail gas treatment device for the silicon-carbon negative electrode fluidized bed is mainly a liquid seal tank that isolates oxygen. It does not isolate the flame carbon powder pollution and other hazards that may cause harm to humans during production, nor does it perform high-altitude discharge of dangerous gases such as hydrogen that may cause fires. In the process of continuously expanding production, the amount of gas that needs to be treated by the tail gas treatment device also increases, so it is necessary to consider tail gas treatment and safety. SUMMARY

[0005] The purpose of the present utility model is to provide a tail gas treatment device for a silicon-carbon negative electrode fluidized bed, which is beneficial to the safe discharge of tail gas, overcoming the shortcomings of the prior art.

[0006] To achieve this purpose, the utility model adopts the following technical solutions:

[0007] An exhaust treatment device of a silicon-carbon negative electrode fluidized bed, comprising an exhaust mechanism and a liquid sealing mechanism;

[0008] The exhaust mechanism comprises a mounting box and a top exhaust cylinder; a first exhaust port is formed in the top wall of the mounting box, and a second exhaust port is formed in the lower part of the side wall of the mounting box; the top exhaust cylinder is vertically extended and mounted outside the mounting box, and the top exhaust cylinder is in communication with the mounting box through the first exhaust port;

[0009] The liquid sealing mechanism comprises a liquid sealing barrel, a bubble breaking net and an air inlet pipe; the liquid sealing barrel is arranged inside the mounting box, the bubble breaking net is arranged inside the liquid sealing barrel and used for covering the opening of the liquid sealing barrel, and the air inlet end of the air inlet pipe is connected with the exhaust outlet of the silicon-carbon negative electrode fluidized bed after penetrating through the mounting box, and the air outlet end of the air inlet pipe is arranged inside the liquid sealing barrel after penetrating through the bubble breaking net;

[0010] The liquid sealing barrel is used for containing alkaline solution, and the bubble breaking net is used for breaking large bubbles into small bubbles.

[0011] Preferably, the exhaust mechanism further comprises a first fan, which is mounted inside the top exhaust cylinder and arranged close to the first exhaust port.

[0012] Preferably, the exhaust mechanism further comprises a side exhaust cylinder and a second fan.

[0013] The side exhaust cylinder is horizontally extended and mounted outside the mounting box, and the side exhaust cylinder is in communication with the mounting box through the second exhaust port.

[0014] The second fan is mounted inside the side exhaust cylinder.

[0015] Preferably, the liquid sealing mechanism further comprises a liquid level meter, which is mounted on the liquid sealing barrel and used for detecting the liquid level of the alkaline solution in the liquid sealing barrel.

[0016] Preferably, the liquid sealing mechanism further comprises a pH detector, which is mounted on the liquid sealing barrel and used for detecting the pH value of the alkaline solution in the liquid sealing barrel.

[0017] Preferably, the liquid sealing mechanism further comprises a heater, which is mounted outside the liquid sealing barrel and used for heating the liquid sealing barrel.

[0018] Preferably, the side wall of the liquid sealing barrel is provided with an inlet and an outlet, and the outlet is arranged above the inlet.

[0019] The liquid inlet is connected with the liquid storage mechanism through a liquid inlet pipeline, and the liquid outlet is connected with a liquid outlet pipeline.

[0020] Preferably, the air exhaust mechanism further comprises a mounting rack, which is mounted in the interior of the mounting box, and the mounting rack is used for placing the liquid seal barrel.

[0021] The side wall of the mounting box is further provided with a transparent window and a plurality of ventilation holes.

[0022] Preferably, the air exhaust mechanism further comprises a rain cap, which is mounted on the top of the top air exhaust cylinder, and an air exhaust gap is left between the rain cap and the top air exhaust cylinder.

[0023] Preferably, the mesh number of the wave-breaking net is 20 meshes.

[0024] The technical scheme provided by the utility model can have the following beneficial effects:

[0025] The tail gas treatment device of the silicon-carbon negative electrode fluidized bed provided by the scheme can reduce the concentration of acetone and hydrogen in the tail gas by absorbing part of the hydrogen, acetone and carbon powder in the tail gas through the lye in the liquid seal barrel; then the high-altitude discharge of hydrogen in the tail gas is realized through the top air exhaust cylinder, which is conducive to realizing the safe discharge of the tail gas and reducing the safety hazard. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 is a structural schematic view of the tail gas treatment device of the silicon-carbon negative electrode fluidized bed of the utility model.

[0027] Figure 2 is a partial structural schematic view of the tail gas treatment device of the silicon-carbon negative electrode fluidized bed of the utility model.

[0028] Figure 3 is a structural schematic view of the liquid seal mechanism in the utility model.

[0029] Figure 4 is a partial structural schematic view of the liquid seal mechanism in the utility model.

[0030] Figure 5 is a partial structural schematic view of the air exhaust mechanism in the utility model.

[0031] Figure 6 is a partial structural schematic view of the air exhaust mechanism in the utility model.

[0032] Among them:

[0033] Air exhaust mechanism 1, mounting box 11, first air exhaust port 111, second air exhaust port 112, transparent window 113, ventilation hole 114, top air exhaust cylinder 12, first fan 13, side air exhaust cylinder 14, second fan 15, mounting rack 16, rain cap 17.

[0034] Liquid seal mechanism 2, liquid seal barrel 21, liquid inlet 211, liquid outlet 212, bubble breaking net 22, air inlet pipe 23, liquid level meter 24. DETAILED DESCRIPTION

[0035] The embodiments of the present application are described in detail below, examples of which are shown in the drawings, wherein the same or similar notations represent the same or similar elements having the same or similar functions throughout. The embodiments described below by reference to the drawings are exemplary only, and are merely intended to explain the present application, and are not to be understood as limiting the present application.

[0036] The technical scheme provides a tail gas treatment device of a silicon-carbon negative electrode fluidized bed, which comprises an exhaust mechanism 1 and a liquid seal mechanism 2.

[0037] The exhaust mechanism 1 comprises a mounting box 11 and a top exhaust cylinder 12; a first exhaust port 111 is formed in the top wall of the mounting box 11, and a second exhaust port 112 is formed in the lower part of the side wall of the mounting box 11; the top exhaust cylinder 12 is vertically extended and mounted outside the mounting box 11, and the top exhaust cylinder 12 is in communication with the mounting box 11 through the first exhaust port 111.

[0038] The liquid seal mechanism 2 comprises a liquid seal barrel 21, a bubble breaking net 22 and an air inlet pipe 23; the liquid seal barrel 21 is arranged inside the mounting box 11, the bubble breaking net 22 is arranged inside the liquid seal barrel 21, and the bubble breaking net 22 is used to cover the opening of the liquid seal barrel 21; the air inlet end of the air inlet pipe 23 is connected with the tail gas outlet of the silicon-carbon negative electrode fluidized bed after penetrating through the mounting box 11, and the air outlet end of the air inlet pipe 23 is arranged inside the liquid seal barrel 21 after penetrating through the bubble breaking net 22.

[0039] The liquid seal barrel 21 is used to contain lye, and the bubble breaking net 22 is used to break large bubbles into small bubbles.

[0040] In order to realize the safe discharge of the tail gas of the silicon-carbon negative electrode fluidized bed, the technical scheme provides a tail gas treatment device, as shown in Figures 1-6 The tail gas treatment device comprises an exhaust mechanism 1 and a liquid seal mechanism 2.

[0041] Specifically, the use method of the tail gas treatment device of the present scheme is as follows: first, the lye is introduced into the inside of the liquid seal barrel 21, and the liquid level of the lye is higher than the bubble breaking net 22, and then the air outlet end of the air inlet pipe 23 is located inside the lye. Then, the air inlet end of the air inlet pipe 23 is connected with the tail gas outlet of the silicon-carbon negative electrode fluidized bed.

[0042] When the exhaust gas enters the exhaust gas treatment device through the inlet pipe 23, an alkaline solution is first introduced. The alkaline solution can absorb some of the hydrogen, acetone, and carbon powder in the exhaust gas, thereby reducing the concentration of acetone and hydrogen in the exhaust gas. In addition, the bubbles generated after the exhaust gas enters the alkaline solution can be broken into smaller bubbles by the bubble-breaking net 22. This not only enhances the absorption of hydrogen and acetone but also effectively prevents carbon powder particles in the exhaust gas from splashing out of the liquid seal tank 21. After the exhaust gas overflows from the alkaline solution, it enters the installation box 11. The installation box 11 isolates the exhaust gas, effectively ensuring the safety of the operators. Part of the exhaust gas located in the installation box 11, due to its lower density than air, such as hydrogen, is discharged from the top exhaust pipe 12 through the first exhaust port 111, achieving high-altitude emission; while the other part, due to its higher density than air, such as acetone, is discharged from the exhaust gas treatment device through the second exhaust port 112, meeting the direct emission standards for odor concentration.

[0043] It should be noted that the height of the top exhaust stack 12 in this scheme can be set according to the actual emission situation to meet the high-altitude emission of hydrogen, and is not limited here.

[0044] Furthermore, the exhaust mechanism 1 also includes a first fan 13, which is installed inside the top exhaust pipe 12 and is positioned close to the first exhaust port 111.

[0045] In one specific embodiment of this technical solution, such as Figure 6 As shown, the first fan 13 can quickly draw hydrogen to the top exhaust stack 12 for external discharge, preventing the accumulation of hydrogen in the installation box 11 and reducing safety hazards.

[0046] Furthermore, the exhaust mechanism 1 also includes a side exhaust pipe 14 and a second fan 15;

[0047] The side exhaust pipe 14 is horizontally extended and installed on the outside of the mounting box 11, and the side exhaust pipe 14 is interconnected with the mounting box 11 through the second exhaust port 112;

[0048] The second fan 15 is installed inside the side exhaust pipe 14.

[0049] In another specific embodiment of this technical solution, the gas inside the installation box 11 is also discharged through the second fan 15 to further ensure the safe use of the exhaust gas treatment device.

[0050] Furthermore, the liquid sealing mechanism 2 also includes a level gauge 24, which is installed on the liquid sealing tank 21 and is used to detect the level of the alkali solution in the liquid sealing tank 21.

[0051] Preferably, the level gauge 24 is a tuning fork level gauge.

[0052] Furthermore, the liquid sealing mechanism 2 also includes a pH meter, which is installed in the liquid sealing tank 21 and is used to detect the pH value of the alkaline solution in the liquid sealing tank 21.

[0053] Specifically, in this solution, an alkaline solution with a pH value of 8-10 is placed inside the liquid-sealed container 21. To ensure the absorption and neutralization effect of the alkaline solution, a pH meter (not shown in the figure) can also be installed inside the liquid-sealed container 21 to detect the pH value of the alkaline solution, so that operators can adjust the pH value of the alkaline solution in a timely manner.

[0054] In one specific embodiment, when the pH value of the alkaline solution is lower than 8, the neutralized alkaline solution can be discharged through the drain port 212 and new alkaline solution can be introduced through the inlet port 211 to adjust the pH value of the alkaline solution in the liquid seal tank 21.

[0055] Furthermore, the liquid sealing mechanism 2 also includes a heater, which is installed outside the liquid sealing barrel 21 and is used to heat the liquid sealing barrel 21.

[0056] The liquid seal tank 21 can be heated by a heater (not shown in the figure), which can simultaneously heat the alkaline solution inside the liquid seal tank 21 in order to increase the absorption concentration or solubility of the alkaline solution.

[0057] To further explain, the side wall of the liquid seal tank 21 is provided with a liquid inlet 211 and a liquid outlet 212, and the liquid outlet 212 is located above the liquid inlet 211;

[0058] The liquid inlet 211 is connected to the liquid storage mechanism through a liquid inlet pipe, and the liquid outlet 212 is connected to a liquid outlet pipe.

[0059] This facilitates the introduction and discharge of alkaline solution within the liquid-sealed tank 21.

[0060] Furthermore, the exhaust mechanism 1 also includes a mounting bracket 16, which is installed inside the mounting box 11 and is used to place the liquid seal tank 21.

[0061] The side wall of the mounting box 11 is also provided with a transparent viewing window 113 and multiple ventilation holes 114.

[0062] The liquid seal tank 21 is placed inside the mounting box 11 via the mounting bracket 16, facilitating the overall movement of the exhaust gas treatment device. Additionally, the transparent viewing window 113 allows for observation of the interior of the mounting box 11, enabling timely handling of any abnormalities. The ventilation holes 114 help maintain pressure balance inside the mounting box 11, further promoting exhaust gas emission.

[0063] Furthermore, the exhaust mechanism 1 also includes a rain cap 17, which is installed on the top of the top exhaust pipe 12, and an exhaust gap is left between the rain cap 17 and the top exhaust pipe 12.

[0064] The rain cap 17 serves two purposes: firstly, it prevents rainwater from entering the exhaust gas treatment device; secondly, it increases the back pressure on the exhaust gas side, prolongs the residence time of the gas in the fluidized bed, increases reaction efficiency, and improves the utilization rate of raw materials.

[0065] To further clarify, the mesh count of the wave-breaking mesh 22 is 20 meshes.

[0066] This allows the large bubbles passing through the sieving mesh 22 to be separated into finer bubbles, and the splashed toner can be blocked by the mesh.

[0067] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0068] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0069] In the description of this utility model, it should be understood that the directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this utility model. The directional terms "inner" and "outer" refer to the inner and outer contours of each component itself.

[0070] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0071] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be construed as limiting the scope of protection of this utility model.

[0072] It should be noted that the terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in sequences other than those illustrated or described herein.

[0073] The technical principles of this utility model have been described above with reference to specific embodiments. These descriptions are merely for explaining the principles of this utility model and should not be construed as limiting the scope of protection of this utility model in any way. Based on this explanation, those skilled in the art can readily conceive of other specific embodiments of this utility model without any inventive effort, and these embodiments will all fall within the scope of protection of this utility model.

Claims

1. A tail gas treatment apparatus for a silicon-carbon negative electrode fluidized bed, characterized by: The exhaust mechanism and the liquid sealing mechanism are included; The exhaust mechanism includes a mounting box and a top exhaust cylinder; a top wall of the mounting box is provided with a first exhaust port, and a lower part of a side wall of the mounting box is provided with a second exhaust port; the top exhaust cylinder is vertically extended and mounted outside the mounting box, and the top exhaust cylinder is in communication with the mounting box through the first exhaust port; The liquid sealing mechanism includes a liquid sealing barrel, a bubble breaking net and an air inlet pipe; the liquid sealing barrel is arranged inside the mounting box, the bubble breaking net is arranged inside the liquid sealing barrel, and the bubble breaking net is used for covering the opening of the liquid sealing barrel; an air inlet end of the air inlet pipe is connected with a tail gas outlet of a silicon-carbon negative electrode fluidized bed after penetrating through the mounting box, and an air outlet end of the air inlet pipe is arranged inside the liquid sealing barrel after penetrating through the bubble breaking net; The liquid sealing barrel is used for containing alkali solution, and the bubble breaking net is used for breaking large bubbles into small bubbles.

2. The tail gas treatment device of a silicon-carbon negative electrode fluidized bed according to claim 1, characterized in that: The exhaust mechanism further includes a first fan, and the first fan is mounted inside the top exhaust cylinder and arranged close to the first exhaust port.

3. The tail gas treatment device of a silicon-carbon negative electrode fluidized bed according to claim 1, characterized in that: The exhaust mechanism further includes a side exhaust cylinder and a second fan; The side exhaust cylinder is horizontally extended and mounted outside the mounting box, and the side exhaust cylinder is in communication with the mounting box through the second exhaust port; The second fan is mounted inside the side exhaust cylinder.

4. The tail gas treatment device of a silicon-carbon negative electrode fluidized bed according to claim 1, characterized in that: The liquid sealing mechanism further includes a liquid level meter, and the liquid level meter is mounted on the liquid sealing barrel and used for detecting the liquid level of the alkali solution in the liquid sealing barrel.

5. The tail gas treatment device of a silicon-carbon negative electrode fluidized bed according to claim 1, characterized in that: The liquid sealing mechanism further includes a pH detector, and the pH detector is mounted on the liquid sealing barrel and used for detecting the pH value of the alkali solution in the liquid sealing barrel.

6. The tail gas treatment device of a silicon-carbon negative electrode fluidized bed according to claim 1, characterized in that: The liquid sealing mechanism further includes a heater, and the heater is mounted outside the liquid sealing barrel and used for heating the liquid sealing barrel.

7. The tail gas treatment device of a silicon-carbon negative electrode fluidized bed according to claim 1, characterized in that: A side wall of the liquid sealing barrel is provided with an inlet and an outlet, and the outlet is located above the inlet; The inlet is connected with a liquid storage mechanism through an inlet pipeline, and the outlet is connected with an outlet pipeline.

8. The tail gas treatment device of a silicon-carbon negative electrode fluidized bed according to claim 1, characterized in that: The exhaust mechanism further includes a mounting rack, and the mounting rack is mounted inside the mounting box and used for placing the liquid sealing barrel; The side wall of the mounting box is further provided with a transparent window and a plurality of ventilation holes.

9. The tail gas treatment device of a silicon-carbon negative electrode fluidized bed according to claim 1, characterized in that: The exhaust mechanism further includes a rain cap, and the rain cap is mounted on the top of the top exhaust cylinder and leaves an exhaust gap between the rain cap and the top exhaust cylinder.

10. The tail gas treatment device of a silicon-carbon negative electrode fluidized bed according to claim 1, characterized in that: The bubble breaking net has a mesh number of 20 meshes.

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