Carbon dioxide removal device

Abstract

The utility model discloses a carbon dioxide removal device which comprises a degassing tower, the degassing tower is sequentially provided with an exhaust funnel and a demisting layer from top to bottom, the lower end of the demisting layer is provided with a plurality of spraying layers and a plurality of packing layers, and each of the spraying layers and each of the packing layers are arranged at intervals; a degassing fan is arranged on the side surface of the degassing tower; the spraying layer is connected with a spraying pump, the other side of the spraying pump is connected with the bottom of the degassing tower, and a solution analyzer is arranged between the spraying pump and the spraying layer.

Description

Technical Field

[0001] The utility model relates to the field of carbon dioxide removal, in particular to a carbon dioxide removal device. Background Art

[0002] The existing lithium battery processing involves lithium sulfate solution. A certain amount of carbon dioxide is dissolved in the lithium sulfate solution. Due to the process requirements, the carbon dioxide in the lithium sulfate solution needs to be removed and the solution needs to be purified.

[0003] Common carbon dioxide removal processes are:

[0004] Physical adsorption: using activated carbon, molecular sieve, silica gel and other methods for adsorption. Membrane separation: using the selective separation of special membranes to separate carbon dioxide. Pressure swing adsorption: commonly used for gas treatment. Chemical absorption: using amine chemicals or other chemicals to selectively absorb carbon dioxide, carbon dioxide is dissolved in the chemicals, and then the carbon dioxide is removed through a desorption tower. However, none of the above processes are suitable for removing carbon dioxide from lithium sulfate solution. Utility Model Content

[0005] In view of the deficiencies in the prior art, the utility model provides a carbon dioxide removal device, which can be used to remove carbon dioxide from a lithium sulfate solution.

[0006] To achieve the above purpose, the utility model provides the following technical solutions:

[0007] A carbon dioxide removal device comprises a degassing tower, wherein the degassing tower is provided with an exhaust pipe and a demisting layer in sequence from top to bottom, a plurality of spray layers and a plurality of packing layers are provided at the lower end of the demisting layer, and each of the plurality of spray layers is spaced apart from each of the plurality of packing layers; a degassing fan is provided on the side of the degassing tower; the spray layer is connected to a spray pump, and the other side of the spray pump is connected to the bottom of the degassing tower, and a solution analyzer is provided between the spray pump and the spray layer.

[0008] As a further solution of the utility model, a liquid level sensor and an inlet for the liquid to be treated are arranged at the upper end of the bottom of the degassing tower.

[0009] As a further solution of the utility model, the inlet of the degassing fan is located below the lower end surface of the packing layer.

[0010] As a further solution of the utility model, two spray layers and two packing layers are arranged at the lower end of the demisting layer, and the spray layers and the packing layers are arranged at intervals.

[0011] As a further solution of the utility model, the demisting layer includes a demisting assembly and a demisting flushing pipe assembly located below the demisting assembly, and the demisting flushing pipe assembly is connected to a flushing valve.

[0012] As a further solution of the utility model, the spray layer is provided with a spray pipe assembly.

[0013] As a further solution of the utility model, the solution analyzer is connected to a drain valve, and the drain valve is connected to a drain regulating valve.

[0014] The utility model has the following beneficial effects:

[0015] The utility model adopts a packing tower, and the gas and liquid adopt countercurrent mass transfer. The lithium sulfate solution to be treated is sprayed down from the top of the tower, and the clean air flows upward from the bottom of the tower. The gas and liquid enter the degassing tower, and the air introduced by the degassing fan enters from the tower kettle, and contacts the air with the solution from top to bottom in countercurrent to blow off and remove the carbon dioxide dissolved in the solution.

[0016] In order to more clearly illustrate the structural features and functions of the present invention, the present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the structure of the embodiment of the present utility model. DETAILED DESCRIPTION

[0018] The present invention will be further described below in conjunction with the accompanying drawings and related knowledge, and described clearly and completely. Obviously, the described application is only a part of the embodiments of the present invention, rather than all of the embodiments.

[0019] In view of the lithium sulfate solution involved in the existing lithium battery processing, a certain amount of carbon dioxide is dissolved in the prepared lithium sulfate solution. Due to the process requirements, the carbon dioxide in the lithium sulfate solution needs to be removed and the solution needs to be purified.

[0020] Reference Figure 1 As shown, the utility model provides a carbon dioxide removal device, which can remove carbon dioxide from lithium sulfate solution and purify the solution;

[0021] The degassing tower 1 comprises an exhaust pipe 2 and a demisting layer, which are arranged from top to bottom in sequence. A plurality of spray layers and a plurality of packing layers are arranged at the lower end of the demisting layer. Each spray layer 3 of the plurality of spray layers is arranged at intervals from each packing layer 4 of the plurality of packing layers. A degassing fan 5 is arranged on the side of the degassing tower. The spray layer 3 is connected to a spray pump 6, and the other side of the spray pump 6 is connected to the bottom of the degassing tower. A solution analyzer 7 is arranged between the spray pump and the spray layer. It is further preferred that a liquid level sensor 8 and a liquid input port 9 to be treated are arranged at the upper end of the bottom of the degassing tower.

[0022] Reference Figure 1As shown, the lithium sulfate solution from the upstream is transported from the liquid input port 9 to be treated to the bottom of the degassing tower for storage, and the liquid level is monitored by the liquid level sensor 8. The solution contains a small amount of CO2, and CO2 needs to be removed by the degassing tower to meet the needs of downstream process production. The degassing tower of the utility model adopts a packed tower form, and the gas and liquid adopt countercurrent mass transfer. The lithium sulfate solution to be treated is sprayed down from the top of the tower, and the clean air flows upward from the bottom of the tower through the degassing fan 5. The gas and liquid enter the degassing tower, and the air introduced by the degassing fan enters from the tower kettle, and contacts the air with the solution from top to bottom in countercurrent to blow off and remove the carbon dioxide dissolved in the solution. The purified solution is pumped to the downstream user by the degassing tower discharge pump. When cleaning is required, process water can be intermittently introduced at the top to rinse the demisting layer. In the utility model, since the solubility of CO2 in the solution is related to the gas partial pressure on the surface of the solution, the CO2 in the solution can be blown out by air based on the principle of different CO2 partial pressures.

[0023] In a preferred embodiment of the utility model, the inlet of the degassing fan is located below the lower end surface of the packing layer. Further preferably, the outlet of the degassing fan 5 is designed with a pressure sensor 10 for detecting the operating pressure of the tower; further preferably, the air inlet of the degassing fan 5 is provided with an air inlet filter 16.

[0024] In the preferred embodiment of the utility model, two spray layers and two packing layers are arranged at the lower end of the demisting layer, the spray layer and the packing layer are arranged at intervals, and the spray pump adopts a two-stage spray pump, and each stage of the spray pump corresponds to a layer of spray pipe assembly, which can better control the size of the spray volume. The spray layer is provided with a spray pipe assembly.

[0025] In a preferred embodiment of the utility model, the demisting layer includes a demisting assembly 11 and a demisting flushing pipe assembly 12 located below the demisting assembly. The demisting flushing pipe assembly is connected to a flushing valve 13. Further preferably, process water can be intermittently introduced at the top to flush the demisting layer.

[0026] In the preferred embodiment of the utility model, the solution analyzer 7 is connected to a drain valve 14, and the drain valve is connected to a drain regulating valve 15. The solution analyzer 7 is designed at the outlet of the spray pump, and the dissolved amount of CO2 in the solution can be determined by detecting the pH value of the solution, so that the product quality of the treated solution can be controlled. If CO2 is not detected, the treated solution is discharged through the drain valve 14 and the spray pump 6. In the utility model, the drain valve 14 is closed during the solution treatment process. When the solution analyzer 7 does not detect that CO2 is contained in the solution, the drain valve 14 is opened to discharge the treated solution.

[0027] In the present invention, it is further preferred that the liquid level of the degassing tower is interlocked with the drain regulating valve to control the liquid level of the tower. The spray pump outlet is designed with an automatic drain valve, and when the liquid level of the tower is high, the liquid is automatically drained. In the present invention, the flushing of the demisting layer is designed with an automatic flushing valve, which is convenient for flushing.

[0028] The technical principle of the utility model is described above in combination with the specific embodiments, which are only the preferred implementation methods of the utility model. The protection scope of the utility model is not limited to the above embodiments, and all technical solutions under the idea of ​​the utility model belong to the protection scope of the utility model. Those skilled in the art can think of other specific implementation methods of the utility model without creative labor, and these methods will fall within the protection scope of the utility model.

Claims

1. A carbon dioxide removal device, characterized in that: The degassing tower comprises an exhaust pipe and a demisting layer, which are arranged in sequence from top to bottom; a plurality of spray layers and a plurality of packing layers are arranged at the lower end of the demisting layer; each of the plurality of spray layers is spaced apart from each of the plurality of packing layers; a degassing fan is arranged on the side of the degassing tower; the spray layer is connected to a spray pump, the other side of the spray pump is connected to the bottom of the degassing tower, and a solution analyzer is arranged between the spray pump and the spray layer.

2. A carbon dioxide removal device according to claim 1, characterized in that: A liquid level sensor and an inlet for the liquid to be treated are arranged at the upper end of the bottom of the degassing tower.

3. A carbon dioxide removal device according to claim 2, characterized in that: The inlet of the degassing fan is located below the lower end surface of the packing layer.

4. A carbon dioxide removal device according to claim 3, characterized in that: Two spray layers and two packing layers are arranged at the lower end of the demisting layer, and the spray layers and the packing layers are arranged at intervals.

5. A carbon dioxide removal device according to claim 4, characterized in that: The demisting layer comprises a demisting assembly and a demisting flushing pipe assembly located below the demisting assembly, and the demisting flushing pipe assembly is connected with a flushing valve.

6. A carbon dioxide removal device according to claim 5, characterized in that: The spray layer is provided with a spray pipe assembly.

7. A carbon dioxide removal device according to claim 6, characterized in that: The solution analyzer is connected to a drain valve, and the drain valve is connected to a drain regulating valve.

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