Carbon dioxide absorption device and method

Abstract

The invention discloses a carbon dioxide absorption device and method, and relates to the technical field of environmental protection, the carbon dioxide absorption device comprises a reaction container, a flue gas diffuser, a driving device, a flue gas inlet pipeline and a flue gas discharge pipeline, the reaction container is used for containing fly ash slurry, the flue gas diffuser is arranged in the reaction container, and the driving device is arranged in the flue gas inlet pipeline. A flue gas channel is arranged in the flue gas diffuser, the inlet end of the flue gas channel is communicated with the flue gas introduction pipeline and used for introducing flue gas, and a plurality of diffusion micropores are further formed in the flue gas diffuser and communicated with the flue gas channel; the flue gas diffuser is arranged along the height direction of the reaction container, and the driving device is connected with the flue gas diffuser and is used for driving the flue gas diffuser to rotate; and the flue gas discharge pipeline is communicated with the reaction container and is used for discharging flue gas. The carbon dioxide absorption method is implemented by adopting the carbon dioxide absorption device. The coal ash can be used for absorbing carbon dioxide in flue gas, so that the environmental burden is relieved, the cost is reduced, and the reaction efficiency can be improved.

Description

Technical Field

[0001] The present invention relates to the technical field of environmental protection, and in particular to a device and method for absorbing carbon dioxide. Background Art

[0002] At present, CO2 capture and storage (CCS) technology of thermal power plants is one of the focuses of close research by scientific researchers and engineering technicians. Among the many CCS technologies, the technology of using fly ash to absorb carbon dioxide in the flue gas emitted by thermal power plants shows unique advantages.

[0003] However, existing devices that use fly ash to absorb carbon dioxide mostly seal carbon dioxide in the form of stable carbonates in mineralized ash through mineralization reactions. This method has low gas conversion efficiency and leads to excessive energy consumption.

[0004] Therefore, it is urgent to provide a carbon dioxide absorption device and method to solve the above problems existing in the prior art. Summary of the invention

[0005] The purpose of the present invention is to provide a carbon dioxide absorption device and method to solve the problems existing in the above-mentioned prior art. Fly ash can be used to absorb carbon dioxide in flue gas, thereby reducing environmental burden, reducing costs, and improving reaction efficiency.

[0006] To achieve the above object, the present invention provides the following solutions:

[0007] The present invention provides a carbon dioxide absorption device, comprising a reaction container, a flue gas diffuser, a driving device, a flue gas inlet pipe and a flue gas exhaust pipe, wherein the reaction container is used to contain fly ash slurry, the flue gas diffuser is arranged in the reaction container, and a flue gas channel is arranged in the flue gas diffuser, the inlet end of the flue gas channel is connected with the flue gas inlet pipe for introducing flue gas, and a plurality of diffusion micropores are also arranged on the flue gas diffuser, and the diffusion micropores are connected with the flue gas channel for allowing the flue gas to diffuse into the reaction container; wherein the flue gas diffuser is arranged along the height direction of the reaction container, and the driving device is connected with the flue gas diffuser for driving the flue gas diffuser to rotate; the flue gas exhaust pipe is connected with the reaction container for allowing the flue gas to be discharged.

[0008] Preferably, it also includes a load-bearing platform, and the reaction container is arranged on the load-bearing platform; wherein, a fixing device is provided on the load-bearing platform, and a rotating connecting device is provided on the fixing device, one end of the smoke inlet pipe is used for smoke entry, and the other end is provided on the fixing device and is rotatably connected to the bottom of the smoke diffuser through the rotating connecting device, and the driving device is provided at the top of the reaction container and connected to the top of the smoke diffuser.

[0009] Preferably, the driving device is a driving motor, the smoke diffuser is a spiral smoke diffuser, the top of the spiral smoke diffuser is connected to the output shaft of the driving motor through a motor rotating rod, and the bottom is connected to the rotating connection device through an auxiliary rotating rod.

[0010] Preferably, both sides of the bottom of the reaction container are supported on the load-bearing platform by a first pillar and a second pillar respectively; wherein the first pillar and the second pillar are both hydraulic pillars.

[0011] Preferably, the smoke exhaust pipe is connected to the top of the reaction container, and the smoke exhaust pipe is also connected to the smoke inlet pipe through a smoke circulation pipe, and a smoke detection device is also provided at the connection between the smoke circulation pipe and the smoke exhaust pipe, and the smoke detection device is used to detect the smoke in the reaction container;

[0012] Among them, the smoke exhaust pipe is provided with a smoke exhaust valve, the smoke circulation pipe is provided with a smoke circulation valve, and the smoke inlet pipe is provided with a smoke inlet valve; and, the smoke circulation pipe is also provided with a pressure pump, and the smoke inlet pipe is also provided with an induced draft fan.

[0013] Preferably, the smoke detection device includes a temperature detection module, a pressure detection module, a carbon dioxide concentration detection module and a control module, the temperature detection module, the pressure detection module and the carbon dioxide concentration detection module are all connected to the control module signal, and the control module is also connected to the smoke exhaust valve, the smoke circulation valve and the smoke inlet valve signal.

[0014] Preferably, the top of the reaction container is further provided with a feeding port for adding fly ash and water, and when the driving device drives the flue gas diffuser to rotate, the fly ash and water can be stirred to form the fly ash slurry; the bottom of the reaction container is further provided with a discharge port, and the discharge port is provided with a discharge valve;

[0015] A pressure gauge and a pressure relief valve are also provided on the top of the reaction container.

[0016] Preferably, it further comprises an ultrasonic device, which is arranged on the reaction container and is used to generate ultrasonic waves;

[0017] There are two ultrasonic devices, namely a first ultrasonic device and a second ultrasonic device, and the first ultrasonic device and the second ultrasonic device are respectively arranged on both sides of the reaction container.

[0018] The present invention also provides a carbon dioxide absorption method, which is implemented using the carbon dioxide absorption device as described above, comprising the steps of:

[0019] S1, introducing flue gas into the flue gas inlet duct, and diffusing the flue gas into the reaction container through the flue gas diffuser;

[0020] S2, allowing the carbon dioxide in the flue gas to react with the fly ash slurry in the reaction container;

[0021] S3, discharging the flue gas in the reaction container through the flue gas exhaust pipe;

[0022] S4. When the pressure in the reaction container drops to 0, unloading is performed.

[0023] Preferably, before step S1, the method further comprises step S101, adding fly ash and water in a preset ratio into the reaction container, driving the flue gas diffuser to rotate by the driving device, and stirring the fly ash and water to form the fly ash slurry;

[0024] The step S2 comprises the steps of:

[0025] S201, when the pressure in the reaction container reaches a preset range, the flue gas inlet pipe is closed, the flue gas circulation pipe is opened, and the pressure pump on the flue gas circulation pipe is turned on to circulate the flue gas;

[0026] S202, allowing the fly ash slurry to fully react with the carbon dioxide in the flue gas until the carbon dioxide concentration in the reaction container reaches the emission range:

[0027] S203, closing the booster pump and the flue gas circulation duct.

[0028] Compared with the prior art, the present invention has achieved the following technical effects:

[0029] The present invention contains fly ash slurry in a reaction container, and after the flue gas discharged from the thermal power plant is introduced into the flue gas access pipe, it can diffuse into the reaction container through the flue gas diffuser to react with the fly ash slurry, so that the fly ash can be used to absorb carbon dioxide in the flue gas, thereby reducing the environmental burden and lowering the cost; moreover, in the present invention, the flue gas diffuser is arranged along the height direction of the reaction container, and the driving device is connected to the flue gas diffuser, which can drive the flue gas diffuser to rotate, so that the flue gas and the fly ash slurry are fully mixed and contacted, thereby improving the reaction efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0031] Figure 1 Schematic diagram of the structure of the carbon dioxide absorption device in an embodiment of the present invention.

[0032] In the figure: 1. Smoke inlet pipe; 2. Smoke inlet valve; 3. First pillar; 4. Smoke circulation pipe; 5. Pressure pump; 6. First ultrasonic device; 7. Smoke circulation valve; 8. Smoke discharge valve; 9. Smoke detection device; 10. Smoke discharge pipe; 11. Driving motor; 12. Pressure gauge; 13. Pressure relief valve; 14. Feeding port; 15. Motor rotating rod; 16. Spiral smoke diffuser; 17. Second ultrasonic device; 18. Diffusion micropores; 19. Discharge valve; 20. Discharge port; 21. Auxiliary rotating rod; 22. Rotating connection device; 23. Second pillar; 24. Fixing device; 25. Load-bearing platform; 26. Draft fan. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] The purpose of the present invention is to provide a carbon dioxide absorption device and method to solve the problems existing in the above-mentioned prior art. It can utilize fly ash to absorb carbon dioxide in flue gas, reduce environmental burden, reduce costs, and improve reaction efficiency.

[0035] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0036] Embodiment 1

[0037] like Figure 1As shown, in this embodiment, a carbon dioxide absorption device is provided, which mainly includes a reaction container, a smoke diffuser, a driving device, a smoke inlet pipe 1 and a smoke exhaust pipe 10. The reaction container is used to contain fly ash slurry. The smoke diffuser is arranged in the reaction container, and a smoke channel is arranged in the smoke diffuser. The inlet end of the smoke channel is connected to the smoke inlet pipe 1 for introducing smoke. The smoke inlet pipe 1 is provided with a smoke inlet valve 2 for controlling the switch. The smoke inlet pipe 1 is also provided with an inlet valve 2 for controlling the switch. The fan 26 provides power for the flow of smoke. The smoke diffuser is also provided with a plurality of diffusion micropores 18, which are connected to the smoke channel for allowing smoke to diffuse into the reaction container. The smoke diffuser is arranged along the height direction of the reaction container, and the driving device is connected to the smoke diffuser for driving the smoke diffuser to rotate. The smoke exhaust pipe 10 is connected to the reaction container for exhausting smoke, and a smoke exhaust valve 8 is provided on the smoke exhaust pipe 10 for controlling the switch.

[0038] In the present embodiment, fly ash slurry is placed in the reaction container. After the flue gas discharged from the thermal power plant is introduced into the flue gas passage 1, it can be diffused into the reaction container through the flue gas diffuser to react with the fly ash slurry, so that the fly ash can be used to absorb the carbon dioxide in the flue gas, which reduces the environmental burden and reduces the cost. Moreover, in the present embodiment, the flue gas diffuser is arranged along the height direction of the reaction container, and the driving device is connected to the flue gas diffuser, which can drive the flue gas diffuser to rotate, so that the flue gas and the fly ash slurry are fully mixed and contacted, thereby improving the reaction efficiency.

[0039] In this embodiment, the carbon dioxide absorption device also includes a load-bearing platform 25, and the reaction container is arranged on the load-bearing platform 25; specifically, the bottom sides of the reaction container are supported on the load-bearing platform 25 by the first pillar 3 and the second pillar 23 respectively, wherein the first pillar 3 and the second pillar 23 are preferably hydraulic pillars, and a control module of the hydraulic pillar is also provided in the weighing platform for controlling the lifting and lowering of the hydraulic pillar.

[0040] Furthermore, a fixing device 24 is also provided on the load-bearing platform 25, and a rotating connection device 22 is provided on the fixing device 24. One end of the smoke inlet pipe 1 is used for smoke to enter, and the other end is provided on the fixing device 24 and is rotationally connected to the bottom of the smoke diffuser through the rotating connection device 22. The driving device is provided at the top of the reaction container and is connected to the top of the smoke diffuser. It should be noted that the fixing device 24 and the rotating connection device 22 can be selected according to specific work needs. For example, the fixing device 24 can be a fixed disk or a fixed sleeve, and the rotating connection device 22 can be a rotating joint, which can realize the transportation of smoke while realizing the rotational connection between the smoke inlet pipe 1 and the smoke diffuser.

[0041] In this embodiment, the smoke diffuser is preferably a spiral smoke diffuser 16, which specifically includes a spiral tube body with a circular outer contour, a smoke channel is formed in the spiral tube body, and a plurality of diffusion micropores 18 are provided on the tube wall of the bolt tube body, and the diffusion micropores 18 are connected to the smoke channel; wherein, the spiral smoke diffuser 16 can be made of rigid and corrosion-resistant materials such as stainless steel, and the diameter of the diffusion micropores 18 is preferably about 0.3 mm.

[0042] Furthermore, the driving device is preferably a driving motor 11, the top of the spiral smoke diffuser 16 is closed, and the center of the top is connected to the output shaft of the driving motor 11 through a solid motor rotating rod 15; the bottom of the spiral smoke diffuser 16 is open, and is rotatably connected to the rotating connecting device 22 through a hollow auxiliary rotating rod 21, wherein the rotating part of the rotating connecting device 22 is threadedly connected to the auxiliary rotating rod 21 and can rotate with the auxiliary rotating rod 21.

[0043] In this embodiment, the flue gas exhaust pipe 10 is connected to the top of the reaction container, and the flue gas exhaust pipe 10 is also connected to the flue gas inlet pipe 1 through a flue gas circulation pipe 4, and a smoke detection device 9 is also provided at the connection between the flue gas circulation pipe 4 and the flue gas exhaust pipe 10, and the smoke detection device 9 is used to detect the flue gas in the reaction container; wherein, a smoke circulation valve 7 is provided on the smoke circulation pipe 4 for controlling the switch, and a pressure pump 5 is also provided on the smoke circulation pipe 4 to provide power for the circulation of the flue gas.

[0044] As a preferred embodiment, the flue gas inlet pipe 1, the flue gas circulation pipe 4 and the flue gas exhaust pipe 10 are all made of materials resistant to acid gas corrosion, such as stainless steel.

[0045] In this embodiment, the flue gas detection device 9 mainly includes a temperature detection module, a pressure detection module, a carbon dioxide concentration detection module and a control module, wherein the temperature detection module, the pressure detection module and the carbon dioxide concentration detection module are used to detect the temperature, pressure and carbon dioxide concentration in the reaction container respectively, and all three are mature existing technologies in this field, and can be selected according to specific work needs, and will not be described in detail in this embodiment. Furthermore, the above three detection modules are all connected to the control module signal to transmit the detection signal to the control module, and the control module is also connected to the flue gas discharge valve 8, the flue gas circulation valve 7 and the flue gas inlet valve 2 by signal, and can control the above valves according to the detection signal to realize automatic control of the valves, or the above valves can also be manually operated, and the discharge valve 19 described below can also be automatically controlled or manually operated.

[0046] In this embodiment, a feeding port 14 is further provided at the top of the reaction container for adding fly ash and water. When the driving device drives the flue gas diffuser to rotate, the fly ash and water can be stirred to form the fly ash slurry; a discharge port 20 is also provided at the bottom of the reaction container for unloading, and a discharge valve 19 is provided on the discharge port 20.

[0047] Furthermore, a pressure gauge 12 and a pressure relief valve 13 are also provided on the top of the reaction container. The pressure gauge 12 is preferably a mechanical pressure gauge 12, which is independently provided from the above-mentioned smoke detection device 9 and has a buffer tube.

[0048] In this embodiment, the carbon dioxide absorption device also includes an ultrasonic device, which is arranged on the reaction container and is used to generate ultrasonic waves to perform ultrasonic treatment on fly ash slurry and flue gas, thereby further improving the reaction efficiency; wherein, as a preferred embodiment, two ultrasonic devices are provided, namely a first ultrasonic device 6 and a second ultrasonic device 17, and the first ultrasonic device 6 and the second ultrasonic device 17 are respectively provided on both sides of the reaction container, or, other numbers of ultrasonic devices can be selected according to work needs, for example, only one ultrasonic device is provided, or three, four or other larger numbers of ultrasonic devices are provided.

[0049] In this embodiment, the control module can be an editable logic controller or a distributed control system, which can automatically control the smoke inlet valve 2, the pressure pump 5, the first ultrasonic device 6, the smoke circulation valve 7, the smoke exhaust valve 8, the drive motor 11, the pressure relief valve 13, the second ultrasonic device 17, the unloading valve 19, the induced draft fan 26, etc.

[0050] Embodiment 2

[0051] This embodiment provides a carbon dioxide absorption method, which is implemented using the carbon dioxide absorption device as described above, and specifically includes the following steps:

[0052] S1. Add a certain proportion of fly ash and water into the reaction container through the feeding port 14, and turn on the driving motor 11 for stirring; wherein, the ratio of fly ash to water is preferably 1:3 to 1:3.12, and the water is added once, and then the fly ash is added in batches to ensure that the materials are mixed evenly and the total volume of the materials does not exceed three quarters of the reaction container; the motor rotating rod 15 on the driving motor 11 drives the entire spiral flue gas diffuser 16 for stirring, and the rotation speed is controlled within a certain range to achieve both mixing the materials and being within a safe range.

[0053] S2. Open the flue gas inlet valve 2, then open the induced draft fan 26, introduce the flue gas discharged from the thermal power plant into the flue gas inlet pipe 1 and enter the reaction container through the spiral flue gas diffuser 16 in the form of aeration, so that the carbon dioxide in the flue gas and the alkaline substances in the fly ash solution undergo a neutralization reaction. At the same time, turn on the first ultrasonic device 6 and the second ultrasonic device 17; wherein, the flue gas introduction speed should be between 1m / s and 1.2m / s.

[0054] S3. When the pressure in the reaction container reaches the design range (preferably 1 MPa to 1.2 MPa), close the flue gas inlet valve 2, open the flue gas circulation valve 7, and at the same time, start the booster pump 5;

[0055] S4, waiting for the fly ash slurry to fully react with the carbon dioxide in the flue gas;

[0056] S5. When the smoke detection device 9 detects that the carbon dioxide concentration is within the emission range (preferably about 2%), the booster pump 5, the induced draft fan 26 and the smoke circulation valve 7 are turned off, and the smoke exhaust valve 8 is opened to exhaust the remaining smoke.

[0057] S6, open the discharge valve 19 to discharge the reaction materials, and turn off the drive motor 11, the first ultrasonic device 6 and the second ultrasonic device 17; it should be noted that when opening the discharge valve 19, the pressure in the reaction container must be checked, and the discharge valve can only be opened when the pressure in the reaction container drops to 0.

[0058] The carbon dioxide absorption method described above in this embodiment can reduce the carbon dioxide content in the flue gas emitted by thermal power plants and weaken the greenhouse effect.

[0059] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the method and core ideas of the present invention. At the same time, for those skilled in the art, according to the ideas of the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A carbon dioxide absorption device, characterized in that: It includes a reaction container, a smoke diffuser, a driving device, a smoke inlet pipe and a smoke exhaust pipe, the reaction container is used to contain fly ash slurry, the smoke diffuser is arranged in the reaction container, and a smoke channel is arranged in the smoke diffuser, the inlet end of the smoke channel is connected with the smoke inlet pipe for introducing smoke, and the smoke diffuser is also provided with a plurality of diffusion micropores, the diffusion micropores are connected with the smoke channel, and are used for allowing smoke to diffuse into the reaction container; wherein, the smoke diffuser is arranged along the height direction of the reaction container, and the driving device is connected with the smoke diffuser, and is used to drive the smoke diffuser to rotate; the smoke exhaust pipe is connected with the reaction container, and is used for exhausting smoke.

2. The carbon dioxide absorption device according to claim 1, characterized in that: It also includes a load-bearing platform, and the reaction container is arranged on the load-bearing platform; wherein, a fixing device is arranged on the load-bearing platform, and a rotating connecting device is arranged on the fixing device; one end of the smoke inlet pipe is used for smoke entry, and the other end is arranged on the fixing device and is rotatably connected to the bottom of the smoke diffuser through the rotating connecting device; the driving device is arranged on the top of the reaction container and is connected to the top of the smoke diffuser.

3. The carbon dioxide absorption device according to claim 2, characterized in that: The driving device is a driving motor, and the smoke diffuser is a spiral smoke diffuser. The top of the spiral smoke diffuser is connected to the output shaft of the driving motor through a motor rotating rod, and the bottom is connected to the rotating connection device through an auxiliary rotating rod.

4. The carbon dioxide absorption device according to claim 2, characterized in that: Both sides of the bottom of the reaction container are supported on the load-bearing platform by a first support column and a second support column respectively; wherein the first support column and the second support column are both hydraulic support columns.

5. The carbon dioxide absorption device according to claim 1 or 2, characterized in that: The smoke exhaust pipe is connected to the top of the reaction container, and the smoke exhaust pipe is also connected to the smoke inlet pipe through a smoke circulation pipe, and a smoke detection device is also provided at the connection between the smoke circulation pipe and the smoke exhaust pipe, and the smoke detection device is used to detect the smoke in the reaction container; Among them, the smoke exhaust pipe is provided with a smoke exhaust valve, the smoke circulation pipe is provided with a smoke circulation valve, and the smoke inlet pipe is provided with a smoke inlet valve; and, the smoke circulation pipe is also provided with a pressure pump, and the smoke inlet pipe is also provided with an induced draft fan.

6. The carbon dioxide absorption device according to claim 5, characterized in that: The smoke detection device includes a temperature detection module, a pressure detection module, a carbon dioxide concentration detection module and a control module. The temperature detection module, the pressure detection module and the carbon dioxide concentration detection module are all connected to the control module signal, and the control module is also connected to the smoke exhaust valve, the smoke circulation valve and the smoke inlet valve signal.

7. The carbon dioxide absorption device according to claim 5, characterized in that: The top of the reaction container is also provided with a feeding port for adding fly ash and water. When the driving device drives the smoke diffuser to rotate, the fly ash and water can be stirred to form the fly ash slurry; the bottom of the reaction container is also provided with a discharge port, and a discharge valve is provided on the discharge port; A pressure gauge and a pressure relief valve are also provided on the top of the reaction container.

8. The carbon dioxide absorption device according to claim 1, characterized in that: It also includes an ultrasonic device, which is arranged on the reaction container and is used to generate ultrasonic waves; There are two ultrasonic devices, namely a first ultrasonic device and a second ultrasonic device, and the first ultrasonic device and the second ultrasonic device are respectively arranged on both sides of the reaction container.

9. A method for absorbing carbon dioxide, characterized in that: The method is implemented by using the carbon dioxide absorption device according to any one of claims 1 to 8, comprising the steps of: S1, introducing flue gas into the flue gas inlet duct, and diffusing the flue gas into the reaction container through the flue gas diffuser; S2, allowing the carbon dioxide in the flue gas to react with the fly ash slurry in the reaction container; S3, discharging the flue gas in the reaction container through the flue gas exhaust pipe; S4. When the pressure in the reaction container drops to 0, unloading is performed.

10. The carbon dioxide absorption method according to claim 9, characterized in that: Before the step S1, the method further includes step S101, adding fly ash and water in a preset ratio into the reaction container, driving the smoke diffuser to rotate by the driving device, and stirring the fly ash and water to form the fly ash slurry; The step S2 comprises the steps of: S201, when the pressure in the reaction container reaches a preset range, the flue gas inlet pipe is closed, the flue gas circulation pipe is opened, and the pressure pump on the flue gas circulation pipe is turned on to circulate the flue gas; S202, allowing the fly ash slurry to fully react with the carbon dioxide in the flue gas until the carbon dioxide concentration in the reaction container reaches the emission range: S203, closing the booster pump and the flue gas circulation duct.

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