Carbon dioxide trapping device for high-humidity flue gas

Abstract

The utility model provides a carbon dioxide trapping device for high-humidity flue gas, which overcomes the defects that the existing device for treating the flue gas by pressure swing adsorption is not suitable for the high-humidity flue gas, the adsorption efficiency is low, and the service life of an adsorption piece is shortened. The device comprises a dust settling chamber, an absorption regeneration tank and a CO2 storage tank, a flue gas inlet and a flue gas outlet are formed in the dust settling chamber; a gas inlet is formed in the bottom of the absorption regeneration tank, a CO2 gas outlet and a residual gas outlet are formed in the top of the absorption regeneration tank, and the absorption regeneration tank is divided into a dehumidification area and an absorption area from bottom to top; the gas inlet is communicated with the flue gas outlet of the dust settling chamber, and the CO2 gas outlet is communicated with the CO2 storage tank; the residual gas outlet is communicated with the atmosphere; the absorption area is filled with an adsorption assembly, and a heating assembly is arranged at the bottom of the adsorption assembly; an air inlet main pipe and a plurality of air inlet branch pipes are arranged in the dehumidification area; an inlet of the air inlet main pipe is connected with the air inlet, an outlet of the air inlet main pipe is connected with inlets of the air inlet branch pipes, outlets of the air inlet branch pipes extend into the absorption area, and drying agents are arranged in the air inlet branch pipes.

Description

Technical Field

[0001] The utility model belongs to the technical field of carbon dioxide gas capture, and particularly relates to a carbon dioxide capture device for high-humidity flue gas. Background Art

[0002] Flue gas is rich in a large amount of carbon dioxide gas, which is a major cause of global warming. The existing flue gas treatment mostly adopts the method of pressure swing adsorption. However, this technology not only consumes a large amount of energy but also is not suitable for high-humidity flue gas. The moisture in the high-humidity flue gas will damage the core adsorbent accessories under the intervention of the pressure swing means, not only reducing the adsorption efficiency but also shortening the service life of the adsorbent accessories.

[0003] In view of the above problems, the utility model provides a carbon dioxide capture device for high-humidity flue gas. Summary of the Invention

[0004] The purpose of the utility model is to solve the deficiencies that the existing device for treating flue gas by pressure swing adsorption is not suitable for high-humidity flue gas, with low adsorption efficiency and shortened service life of the adsorbent accessories, and to provide a carbon dioxide capture device for high-humidity flue gas.

[0005] To achieve the above purpose, the technical solution provided by the utility model is as follows:

[0006] A carbon dioxide capture device for high-humidity flue gas, which is characterized in that: it includes a dust settling chamber, an absorption and regeneration tank, and a CO2 storage tank;

[0007] The dust settling chamber is used for removing dust from the flue gas, and is provided with a flue gas inlet and a flue gas outlet thereon;

[0008] The absorption and regeneration tank is provided with an air inlet at the bottom, a CO2 outlet and a residual gas outlet at the top, and is divided into a dehumidification zone and an absorption zone from bottom to top; the air inlet is communicated with the flue gas outlet of the dust settling chamber, the CO2 outlet is communicated with the CO2 storage tank; the residual gas outlet is communicated with the atmosphere;

[0009] The absorption zone is filled with an adsorption component (such as metal organic framework, etc., which can be heated to release carbon dioxide) capable of heating and regenerating to desorb CO2, and a heating component (such as a heating rod) is arranged at the bottom of the adsorption component for heating and desorbing the solid adsorption material;

[0010] An air inlet main pipe and a plurality of air inlet branch pipes are arranged in the dehumidification zone; the inlet of the air inlet main pipe is connected with the air inlet at the bottom of the absorption and regeneration tank, the outlet is connected with the inlets of the plurality of air inlet branch pipes, the outlets of the plurality of air inlet branch pipes extend into the absorption zone, and a desiccant is arranged in each air inlet branch pipe.

[0011] Furthermore, in order to enhance the dust removal ability and increase the CO2 capture concentration, the dust settling chamber includes a dust settling main body and support legs arranged at the bottom of the dust settling main body;

[0012] Inside the dust settling main body, from top to bottom, there are a flue gas outlet area, a dust settling area, a flue gas inlet area, and a dust collection area respectively;

[0013] The flue gas outlet is arranged at the flue gas outlet area; the flue gas inlet is arranged at the flue gas inlet area;

[0014] Filter cartridges are arranged in the dust settling area, and filter membranes are arranged at the tops of the filter cartridges;

[0015] An inverted frustum-shaped dust collection hopper is arranged in the dust collection area, and a discharge port is arranged at the bottom of the dust collection hopper.

[0016] Furthermore, in order to remove moisture in the flue gas as much as possible, the intake branch pipe is U-shaped from the inlet to the outlet, and desiccants are arranged at both straight pipe sections on both sides.

[0017] Furthermore, in order to enable CO2 to enter the absorption area evenly and improve the adsorption efficiency, multiple intake branch pipes are circumferentially and evenly distributed in the dehumidification area with the intake main pipe as the axis of symmetry.

[0018] Furthermore, support legs are arranged at the bottom of the absorption and regeneration tank.

[0019] Furthermore, a first switch valve is arranged on the connecting pipe between the flue gas outlet of the dust settling chamber and the intake port of the absorption and regeneration tank;

[0020] A second switch valve is arranged on the connecting pipe between the CO2 outlet of the absorption and regeneration tank and the CO2 storage tank;

[0021] A third switch valve is arranged on the connecting pipe between the residual gas outlet of the absorption and regeneration tank and the outside atmosphere.

[0022] Furthermore, the desiccant is molecular sieve, zeolite or silica gel.

[0023] Advantages of the present utility model:

[0024] 1. The carbon dioxide capture device of the present utility model mainly aims at high-humidity flue gas. First, the high-humidity flue gas is pretreated for dust settling to remove impurities, and then the moisture in the flue gas is removed specifically before adsorption. The whole device is reliable in processing and capturing the flue gas, has a simple structure, is convenient to operate, and the capture process is simple, efficient, has less energy consumption, and has a high adsorption efficiency.

[0025] 2. Before the device of the present utility model captures carbon dioxide, the dust chamber is first used to treat the solid particles existing in the flue gas, and then the desiccant is used to adsorb moisture to obtain the flue gas without dust and moisture. After that, the mature heating desorption adsorbent is used to adsorb carbon dioxide. The whole device not only improves the capture efficiency and purity of carbon dioxide, but also greatly extends the service life of the adsorbent. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic structural diagram of the flue gas carbon dioxide capture device of the present utility model.

[0027] The reference numerals are as follows:

[0028] 1 - Dust chamber, 11 - Filter membrane, 12 - Filter cartridge, 13 - Flue gas inlet, 14 - Dust collection hopper, 15 - Flue gas outlet, 2 - Absorption and regeneration tank, 21 - Inlet, 22 - CO2 outlet, 23 - Main inlet pipe, 24 - First drying element, 25 - Inlet branch pipe, 26 - Second drying element, 27 - Heating rod, 28 - Adsorption assembly, 29 - Residual gas outlet, 3 - First switching valve, 4 - Second switching valve, 5 - CO2 storage tank, 6 - Third switching valve. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0029] The following further describes in detail the content of the present utility model in conjunction with the drawings and specific embodiments:

[0030] As Figure 1 shown, the carbon dioxide capture device for high-humidity flue gas designed by the present utility model includes a dust chamber, an absorption and regeneration tank, and a CO2 storage tank.

[0031] The dust chamber is used for removing dust from the flue gas, and includes a dust removal main body and a support frame arranged at the bottom of the dust removal main body. Inside the dust removal main body, from top to bottom, there are a flue gas outlet area, a dust removal area, a flue gas inlet area, and a dust collection area; a flue gas outlet is arranged in the flue gas outlet area; a flue gas inlet is arranged in the flue gas inlet area; a filter cartridge is arranged in the dust removal area, and a filter membrane is arranged at the top of the filter cartridge; an inverted frustum-shaped dust collection hopper is arranged in the dust collection area, and a discharge port is arranged at the bottom of the dust collection hopper.

[0032] The bottom of the absorption and regeneration tank is provided with support legs and an air inlet, and the top is provided with a CO2 outlet and a residual gas outlet. Inside it, it is divided into a dehumidification area and an absorption area from bottom to top. Among them, the absorption area is filled with an adsorption component capable of heating and regenerating to desorb CO2. In this embodiment, the adsorption component is a metal-organic framework; a heating rod is arranged at the bottom of the adsorption component to realize the regeneration of the adsorption component. Through heating, the adsorbed CO2 in the adsorption component can be desorbed. A main air inlet pipe and a plurality of air inlet branch pipes are arranged in the dehumidification area; the inlet of the main air inlet pipe is connected to the air inlet, and the outlet is connected to the inlets of the plurality of air inlet branch pipes. The outlets of the plurality of air inlet branch pipes extend into the absorption area. In order to make CO2 enter the absorption area evenly and improve the adsorption efficiency, the plurality of air inlet branch pipes are circumferentially and evenly distributed in the dehumidification area with the main air inlet pipe as the symmetry axis; in order to remove the moisture in the flue gas as much as possible, each air inlet branch pipe is U-shaped from the inlet to the outlet, and desiccants are arranged at both straight pipe parts. The one located at the inner straight pipe part is called the first desiccant, and the one located at the outer straight pipe part is called the second desiccant. In this embodiment, the desiccants used are all molecular sieves.

[0033] The flue gas outlet of the dust settling chamber is communicated with the air inlet of the absorption and regeneration tank, and a first switch valve is arranged on the communication pipeline; the CO2 outlet of the absorption and regeneration tank is communicated with the CO2 storage tank, and a second switch valve is arranged on the communication pipeline; the residual gas outlet of the absorption and regeneration tank is communicated with the outside atmosphere, and a third switch valve is arranged on the communication pipeline. In order to facilitate sucking out and storing CO2, a CO2 air pump can be added between the second switch valve and the CO2 storage tank; in order to facilitate the discharge of residual gas, a residual gas air pump can be added behind the third switch valve.

[0034] The working process of the above device is as follows:

[0035] Open the first switch valve 3 and the third switch valve 6. The flue gas enters the dust settling chamber 1 through the flue gas inlet 13. The flue gas is dust-removed under the action of the filter cartridge 12 and the filter membrane 11. The dust enters the dust collection hopper 14. The flue gas after dust removal enters the absorption and regeneration tank 2 through the flue gas outlet 15. The flue gas flows upward through the inlet 21 and enters the main inlet pipe 23. At the outlet of the main inlet pipe 23, the flue gas is diverted to each inlet branch pipe 25. The flue gas flows inside the inlet branch pipe 25, and the moisture in the flue gas is effectively removed through the first drying member 24 and the second drying member 26. The flue gas after moisture removal is adsorbed by the adsorption assembly 28 for CO2, and the remaining flue gas is discharged through the residual gas outlet 29. When the adsorption assembly 28 reaches saturation (to determine whether it reaches saturated absorption, a carbon dioxide concentration detector can be used. This instrument is set on the connecting pipe at the residual gas outlet and is used to judge the adsorption state of the adsorption assembly and the residual situation of carbon dioxide in the treated flue gas. When the carbon dioxide content in the residual gas is similar to that in the flue gas, it indicates that the adsorption assembly reaches the saturated state; at this time, the flue gas source needs to be closed, and the solid adsorbent is desorbed after the residual gas is discharged; in order to avoid misdischarge, a reflux pipe and a switch valve can also be designed to return the residual gas containing carbon dioxide to the inlet for reprocessing), this absorption process stops, and the residual gas is discharged through the residual gas outlet; then the desorption process starts. Close the first switch valve 3 and the third switch valve 6, open the second switch valve 4, and the adsorption assembly 28 is regenerated through the heating rod 27. The desorbed CO2 is stored in the CO2 storage tank. In this way, a carbon dioxide capture process is completed.

[0036] The above completes a cycle process of carbon dioxide capture. Repeating the above process can realize the capture of carbon dioxide from high-humidity flue gas.

[0037] As described above, it is only the specific implementation manner of the present utility model, but the protection scope of the present utility model is not limited thereto. Any person skilled in the art in the technical field disclosed by the present utility model can easily think of various equivalent modifications or substitutions within the technical scope disclosed by the present utility model, and these modifications or substitutions should all be covered within the protection scope of the present utility model.

Claims

1. A carbon dioxide capture device for high-humidity flue gas, characterized in that: It includes a dust settling chamber, an absorption and regeneration tank, and a CO2 storage tank; The dust settling chamber is used for removing dust from the flue gas, and is provided with a flue gas inlet and a flue gas outlet thereon; The bottom of the absorption and regeneration tank is provided with an air inlet, the top is provided with a CO2 outlet and a residual gas outlet, and it is divided into a dehumidification zone and an absorption zone from bottom to top; the air inlet is communicated with the flue gas outlet of the dust settling chamber; the CO2 outlet is communicated with the CO2 storage tank; the residual gas outlet is communicated with the atmosphere; The absorption zone is filled with an adsorption component capable of heating and regenerating to desorb CO2, and a heating component is arranged at the bottom of the adsorption component for heating and desorbing the solid adsorption material; An air inlet main pipe and a plurality of air inlet branch pipes are arranged in the dehumidification zone; the inlet of the air inlet main pipe is connected to the air inlet at the bottom of the absorption and regeneration tank, the outlet is connected to the inlets of the plurality of air inlet branch pipes, the outlets of the plurality of air inlet branch pipes extend into the absorption zone, and a desiccant is arranged in each air inlet branch pipe.

2. The carbon dioxide capture device for high-humidity flue gas according to claim 1, characterized in that: The dust settling chamber includes a dust settling main body and a support frame arranged at the bottom of the dust settling main body; Inside the dust settling main body, from top to bottom, there are a flue gas outlet area, a dust settling area, a flue gas inlet area, and a dust collection area; The flue gas outlet is arranged at the flue gas outlet area; the flue gas inlet is arranged at the flue gas inlet area; Filter cartridges are arranged in the dust settling area, and filter membranes are arranged at the tops of the filter cartridges; The dust collection area is provided with an inverted frustum-shaped dust collection hopper, and a discharge port is arranged at the bottom of the dust collection hopper.

3. The carbon dioxide capture device for high-humidity flue gas according to claim 1 or 2, characterized in that: The air inlet branch pipe is U-shaped from the inlet to the outlet, and desiccants are arranged at both straight pipe parts on both sides.

4. The carbon dioxide capture device for high-humidity flue gas according to claim 3, characterized in that: A plurality of air inlet branch pipes are circumferentially and evenly distributed in the dehumidification zone with the air inlet main pipe as the axis of symmetry.

5. The carbon dioxide capture device for high-humidity flue gas according to claim 4, characterized in that: Support legs are arranged at the bottom of the absorption and regeneration tank.

6. The carbon dioxide capture device for high-humidity flue gas according to claim 5, characterized in that: A first switch valve is arranged on the connecting pipe between the flue gas outlet of the dust settling chamber and the air inlet of the absorption and regeneration tank; A second switch valve is arranged on the connecting pipe between the CO2 outlet of the absorption and regeneration tank and the CO2 storage tank; A third switch valve is arranged on the connecting pipe between the residual gas outlet of the absorption and regeneration tank and the atmosphere.

7. The carbon dioxide capture device for high-humidity flue gas according to claim 6, characterized in that: The desiccant is molecular sieve, zeolite or silica gel.

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