Flue gas carbon dioxide trapping device

Abstract

The utility model provides a flue gas carbon dioxide trapping device which solves the problems that a flue gas carbon dioxide trapping device is complex, high in energy consumption and low in concentration of trapped carbon dioxide. The device comprises a dust settling chamber, an absorption regeneration tower, a liquid storage tank and a CO2 storage tank, a flue gas inlet and a flue gas outlet are formed in the dust settling chamber; a plurality of absorption units are arranged in the absorption regeneration tower from bottom to top, and each absorption unit comprises a filler assembly and a spraying assembly from bottom to top; the filler assembly is filled with a solid adsorbent and is provided with a heating assembly, and the spraying assembly sprays water into the filler assembly; a liquid outlet, a gas outlet and an absorption gas inlet are formed in the absorption regeneration tower; the flue gas outlet is communicated with the absorption gas inlet; the gas outlet is communicated with the CO2 storage tank and the atmosphere at the same time; a water inlet, a reflux inlet and a water outlet are formed in the liquid storage tank; the liquid outlet is communicated with the reflux inlet, and the water outlet is communicated with the spraying assembly.

Description

Technical Field

[0001] The utility model belongs to the technical field of carbon dioxide gas capture, and specifically relates to a flue gas carbon dioxide capture device. Background Technique

[0002] Flue gas is rich in a large amount of carbon dioxide gas, which is a major cause of global warming; capturing the carbon dioxide gas therein will contribute to the goal of carbon peak and carbon neutrality. However, the construction and maintenance costs of existing carbon dioxide capture devices are relatively high, including equipment investment, energy consumption, and operating costs. Moreover, the capture device usually involves multiple technologies and equipment, and the complexity of the system may lead to difficulties in operation and maintenance. In addition, existing capture equipment has the problem of low selectivity for carbon dioxide. Thus, it will more or less affect the efficient capture of carbon dioxide in flue gas.

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

[0004] The purpose of the utility model is to solve the deficiencies of the existing flue gas carbon dioxide capture device, which is relatively complex, has a large energy consumption cost, and has low selectivity for carbon dioxide, and to provide a flue gas carbon dioxide capture device.

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

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

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

[0008] A plurality of absorption units are arranged in the absorption and regeneration tower from bottom to top. Each absorption unit includes a packing component and a spraying component from bottom to top; wherein, the packing component is filled with a solid adsorbent capable of wet regenerating CO2 (i.e., this adsorbent adsorbs positively when dry and desorbs reversely when humidified, which is an existing CO2 adsorption material), and the spraying component sprays water into the packing component; a heating component is also arranged at the packing component;

[0009] A liquid outlet is arranged at the bottom of the absorption and regeneration tower, an air outlet is arranged at the top, and an absorption air inlet is arranged near the bottom and below the absorption unit so as to make full use of the lowermost absorption unit;

[0010] The flue gas outlet of the dust settling chamber is communicated with the absorption air inlet of the absorption and regeneration tower;

[0011] The gas outlet of the absorption and regeneration tower is connected to both the CO2 storage tank and the atmosphere at the same time;

[0012] The liquid storage tank is used to hold the water for desorption, and is provided with a water inlet, a reflux port and a water outlet;

[0013] The liquid outlet of the absorption and regeneration tower is connected to the reflux port of the liquid storage tank through a reflux pipeline, and a pump Ⅰ is arranged on the reflux pipeline;

[0014] The water outlet of the liquid storage tank is connected to the inlets of the spray assemblies of each absorption unit through a delivery pipeline; and a pump Ⅱ is arranged on the delivery pipeline.

[0015] Furthermore, a gas equalizer connected to the absorption air inlet is arranged inside the absorption and regeneration tower. The purpose of using the gas equalizer is to enable the flue gas to enter the absorption and regeneration tower evenly, be evenly absorbed by the absorption unit, maximize the utilization of the absorption unit, improve the absorption capacity, and this structure can adopt the existing structure.

[0016] Furthermore, in order to enhance the dust removal ability and improve the capture concentration of CO2, the dust removal chamber 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 are a flue gas outlet area, a dust removal area, a flue gas inlet area and a dust collection area;

[0017] The flue gas outlet is arranged at the flue gas outlet area; the flue gas inlet is arranged at the flue gas inlet area;

[0018] Filter cartridges are arranged in the dust removal area, and filter membranes are arranged at the tops of the filter cartridges;

[0019] 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.

[0020] Furthermore, there are two absorption units, namely a first absorption unit and a second absorption unit arranged from top to bottom; that is, the first absorption unit includes a first spray assembly and a first packing assembly, and the second absorption unit includes a second spray assembly and a second packing assembly.

[0021] Furthermore, the delivery pipeline includes a main pipeline, a first branch pipeline and a second branch pipeline;

[0022] The main pipeline is connected to the inlets of the spray assemblies of the first absorption unit through the first branch pipeline and to the inlets of the spray assemblies of the second absorption unit through the second branch pipeline;

[0023] The pump Ⅱ is arranged on the main pipeline;

[0024] A first switch valve is arranged on the first branch pipeline;

[0025] A second switch valve is arranged on the second branch pipeline.

[0026] Further, the spraying assembly includes a plurality of atomizing nozzles uniformly arranged, which is convenient for uniformly spraying the solid adsorbent for wet regeneration of CO2. After the water is atomized by the atomizing nozzles, the impact force will become smaller, which helps to extend the service life of the solid adsorbent.

[0027] Further, a third switching valve is provided on the connecting pipe (referred to as the first connecting pipe) between the air outlet and the CO2 storage tank; a fourth switching valve is provided on the connecting pipe (referred to as the second connecting pipe) communicating with the atmosphere.

[0028] Further, the main body of the absorption and regeneration tower is cylindrical, and its top and bottom are both hemispherical, and support legs are provided at the bottom.

[0029] Advantages of the present utility model:

[0030] 1. The present utility model captures and recovers carbon dioxide by using a typical absorption-regeneration reaction, and uses a solid adsorbent for dry absorption-humidification regeneration to efficiently capture carbon dioxide. The whole process is simple and efficient, the device is simple, and the energy consumption is low; at the same time, the absorption and regeneration tower of the present utility model integrates the functions of an absorption tower and a regeneration tower, making the structure of the whole device simpler. Before the absorption and regeneration tower, a dust settling chamber is used to treat the flue gas, and CO2 gas without impurities can be obtained, while avoiding blockage of the packing assembly.

[0031] 2. The present utility model utilizes the characteristics that the wet regeneration CO2 material efficiently and selectively adsorbs CO2 in a dry environment at normal temperature and pressure and desorbs CO2 in a humid environment, and designs a device with a simple structure, convenient installation, and no other pollutants discharged during the use process; at the same time, the device adopts a liquid storage tank, which can reuse water resources and is more environmentally friendly and reliable. Description of the Drawings

[0032] Figure 1 It is a schematic structural diagram of a flue gas carbon dioxide capture device of the present utility model.

[0033] The reference numerals in the drawings are as follows:

[0034] 1 - Dust settling chamber, 11 - Filter membrane, 12 - Filter cartridge, 13 - Flue gas inlet, 14 - Dust collection hopper, 15 - Flue gas outlet, 2 - Absorption and regeneration tower, 21 - First spraying assembly, 22 - First packing assembly, 23 - Second spraying assembly, 24 - Second packing assembly, 25 - Absorption inlet, 26 - Liquid outlet, 27 - Air outlet, 28 - Heating pipe, 3 - Liquid storage tank, 4 - CO2 storage tank, 5 - Pump I, 6 - Pump II, 7 - First switching valve, 8 - Second switching valve, 9 - Third switching valve, 10 - Fourth switching valve. Detailed Embodiment

[0035] The following further describes the content of the present utility model in detail in conjunction with the attached drawings and specific embodiments:

[0036] As Figure 1 shown, the flue gas carbon dioxide capture device designed by the present utility model includes a dust settling chamber, an absorption and regeneration tower, a liquid storage tank, and a CO2 storage tank.

[0037] The dust settling chamber is used for removing dust from the flue gas, and 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. Among them, a flue gas outlet is arranged at the flue gas outlet area; a 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; 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.

[0038] The main body of the absorption and regeneration tower is cylindrical, with hemispherical shapes at both the top and the bottom, and support legs are arranged at the bottom. Inside the main body, two absorption units (the specific design quantity can be adjusted according to the size of the absorption and regeneration tower) are arranged from bottom to top, namely the first absorption unit and the second absorption unit; among them, the first absorption unit includes a first spraying assembly and a first packing assembly from top to bottom, the second absorption unit includes a second spraying assembly and a second packing assembly from top to bottom, and the first spraying assembly and the second spraying assembly are respectively used for spraying water into the first packing assembly and the second packing assembly, and both include a plurality of uniformly arranged atomizing nozzles; solid adsorbents capable of wet regenerating CO2 (that is, the adsorbent adsorbs positively when dry and desorbs reversely when humidified) are filled in the first packing assembly and the second packing assembly, and heating assemblies (i.e., heating pipes) are also arranged at the first packing assembly and the second packing assembly. A liquid outlet is arranged at the bottom of the absorption and regeneration tower, an air outlet is arranged at the top, and an absorption air inlet is arranged at a position close to the bottom and lower than the absorption unit; in order to make the flue gas enter more evenly, a gas equalizer communicated with the absorption air inlet is arranged in the absorption and regeneration tower, and this gas equalizer can adopt the existing equalizing design method, aiming to make the flue gas entering the absorption and regeneration tower be evenly absorbed by the solid adsorbent.

[0039] The flue gas outlet of the dust settling chamber is connected to the absorption inlet of the absorption and regeneration tower, and a switching valve can be provided on the connecting pipeline. The outlet of the absorption and regeneration tower is connected to the CO2 storage tank through the first connecting pipeline and to the atmosphere through the second connecting pipeline; among them, a third switching valve is provided on the first connecting pipeline (in order to facilitate the suction of CO2 storage, a CO2 air pump can be added between the third switching valve and the CO2 storage tank), and a fourth switching valve is provided on the second connecting pipeline (in order to facilitate the discharge of residual gas, a residual gas air pump can be added behind the fourth switching valve). The liquid storage tank is used to hold the water for desorption, and it is provided with a water inlet, a reflux port and a water outlet; the liquid outlet of the absorption and regeneration tower is connected to the reflux port of the liquid storage tank through a reflux pipeline, and a pump I is provided on the reflux pipeline; the water outlet of the liquid storage tank is connected to the inlets of the spray components of the two absorption units through a conveying pipeline; among them, the conveying pipeline includes a main pipeline, a first branch pipeline and a second branch pipeline; the main pipeline is connected to the inlet of the first spray component through the first branch pipeline and to the inlet of the second spray component through the second branch pipeline; a pump II is provided on the main pipeline; a first switching valve is provided on the first branch pipeline; a second switching valve is provided on the second branch pipeline.

[0040] The working process is as follows:

[0041] 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. After dust removal, the flue gas enters the absorption and regeneration tower 2 through the flue gas outlet 15. The flue gas flows upward, and the solid adsorbents of the first packing component 22 and the second packing component 24 absorb CO2 in the flue gas; when the solid adsorbent reaches saturation (to judge whether it reaches saturated absorption, a carbon dioxide concentration detector can be used. This instrument is set on the second connecting pipe to judge the adsorption state of the solid adsorbent and the residual situation of carbon dioxide in the treated flue gas. When the residual gas is similar to the carbon dioxide content in the flue gas, it indicates that the solid adsorbent has reached 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, the residual gas containing carbon dioxide can also be returned to the absorption inlet for reprocessing by designing a reflux pipe and a switching valve), this absorption process stops, and the residual gas is discharged through the second connecting pipe; then the fourth switching valve 10 is closed, and the desorption process starts. Liquid water enters the first spraying component 21 and the second spraying component 23 to spray the first packing component 22 and the second packing component 24. At this time, the desorption process of CO2 starts. The third switching valve 9 is opened, and the CO2 gas enters the CO2 storage tank 4 through the first connecting pipe to store CO2. The liquid flows out through the liquid outlet 26 at the bottom of the absorption and regeneration tower 2 and is stored in the liquid storage tank 3 under the action of the pump I 5 (when desorbing next time, the pump II 6 can send the liquid in the liquid storage tank 3 into the absorption and regeneration tower 2 again through the first switching valve 7 and the second switching valve 8). After desorption is completed, the first packing component and the second packing component are heated by the heating pipe in the absorption and regeneration tower 2 to dry and regenerate the solid adsorbent for reuse. In this way, the absorption process and the desorption process are carried out reciprocally to achieve the capture of CO2.

[0042] The above completes a cycle process of carbon dioxide capture. Repeating the above process can achieve the capture of carbon dioxide from flue gas.

[0043] 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 within the technical scope disclosed by the present utility model can easily think of various equivalent modifications or substitutions, and these modifications or substitutions should all be covered within the protection scope of the present utility model.

Claims

1. A flue gas carbon dioxide capture device, characterized in that: It includes a dust settling chamber, an absorption and regeneration tower, a liquid storage tank, and a CO2 storage tank; The dust settling chamber is used for dust removal of flue gas, and is provided with a flue gas inlet and a flue gas outlet thereon; A plurality of absorption units are arranged in the absorption and regeneration tower from bottom to top. Each absorption unit includes a packing assembly and a spraying assembly from bottom to top. Among them, the packing assembly is filled with a solid adsorbent capable of wet regenerating CO2, and the spraying assembly sprays water into the packing assembly; a heating assembly is also provided at the packing assembly; A liquid outlet is arranged at the bottom of the absorption and regeneration tower, an air outlet is arranged at the top, and an absorption air inlet is arranged at a position close to the bottom and lower than the absorption unit; The flue gas outlet of the dust settling chamber is communicated with the absorption air inlet of the absorption and regeneration tower; The air outlet of the absorption and regeneration tower is communicated with both the CO2 storage tank and the atmosphere at the same time; The liquid storage tank is used for containing the water used for desorption, and is provided with a water inlet, a return port, and a water outlet thereon; The liquid outlet of the absorption and regeneration tower is communicated with the return port of the liquid storage tank through a return pipeline, and a pump I is arranged on the return pipeline; The water outlet of the liquid storage tank is communicated with the inlets of the spraying assemblies of each absorption unit through a conveying pipeline; and a pump II is arranged on the conveying pipeline.

2. The flue gas carbon dioxide capture device according to claim 1, wherein: A gas distributor communicated with the absorption air inlet is arranged in the absorption and regeneration tower.

3. The flue gas carbon dioxide capture device according to claim 1 or 2, wherein: 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; 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.

4. The flue gas carbon dioxide capture device according to claim 3, wherein: There are two absorption units, which are the first absorption unit and the second absorption unit arranged from top to bottom.

5. The flue gas carbon dioxide capture device according to claim 4, wherein: The conveying pipeline includes a main pipeline, a first branch pipeline, and a second branch pipeline; The main pipeline is communicated with the inlet of the spraying assembly of the first absorption unit through the first branch pipeline, and is communicated with the inlet of the spraying assembly of the second absorption unit through the second branch pipeline; The pump II is arranged on the main pipeline; A first switch valve is arranged on the first branch pipeline; A second switch valve is arranged on the second branch pipeline.

6. The flue gas carbon dioxide capture device according to claim 5, wherein: The spraying assembly includes a plurality of uniformly arranged atomizing nozzles.

7. The flue gas carbon dioxide capture device according to claim 6, wherein: A third switch valve is arranged on the connecting pipeline between the air outlet and the CO2 storage tank; a fourth switch valve is arranged on the connecting pipeline with the atmosphere.

8. The flue gas carbon dioxide capture device according to claim 7, wherein: The main body of the absorption and regeneration tower is cylindrical, with hemispherical shapes at both its top and bottom, and support legs are provided at the bottom.

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