Device and method for fixing carbon dioxide by utilizing fly ash of power plant

Abstract

The invention discloses a device and a method for fixing carbon dioxide by utilizing fly ash of a power plant, and relates to the technical field of environmental protection, the device for fixing carbon dioxide by utilizing fly ash of the power plant comprises a reaction container, a rotating structure, a flue gas inlet pipeline, a flue gas circulating pipeline, a flue gas discharge pipeline and a flue gas integration device, the rotating structure is used for driving the reaction container to rotate, one end of the flue gas introducing pipeline, the two ends of the flue gas circulating pipeline and one end of the flue gas discharging pipeline can be communicated with the reaction container, the flue gas introducing pipeline is used for introducing flue gas into the reaction container, and the flue gas discharging pipeline is used for discharging the flue gas into the reaction container. The flue gas discharge pipeline is used for discharging flue gas in the reaction container, and the flue gas integration device is used for detecting the concentration of carbon dioxide in the reaction container. The device and the method for fixing the carbon dioxide by utilizing the fly ash of the power plant, disclosed by the invention, not only are beneficial to environmental protection, but also can realize effective utilization of resources.

Description

Technical Field

[0001] The invention relates to the technical field of environmental protection, and in particular to a device and method for fixing carbon dioxide using fly ash from a power plant. Background Art

[0002] Globally, carbon dioxide emissions are one of the main causes of climate change, and reducing carbon dioxide emissions has become a consensus among governments and the scientific community. Coal-fired power plants are one of the main sources of carbon dioxide emissions. Therefore, it is crucial to develop efficient and sustainable carbon dioxide emission reduction technologies. Summary of the invention

[0003] The purpose of the present invention is to provide a device and method for fixing carbon dioxide using fly ash from a power plant, so as to solve the problems existing in the above-mentioned prior art, which is not only beneficial to environmental protection, but also can realize the effective utilization of resources.

[0004] To achieve the above object, the present invention provides the following solutions:

[0005] The present invention provides a device for fixing carbon dioxide using fly ash from a power plant, comprising: a reaction container, a rotating structure, a flue gas introduction pipe, a flue gas circulation pipe, a flue gas exhaust pipe and a flue gas integration device, wherein the rotating structure is used to drive the reaction container to rotate, one end of the flue gas introduction pipe, both ends of the flue gas circulation pipe and one end of the flue gas exhaust pipe can be respectively connected to the reaction container, the flue gas introduction pipe is used to introduce flue gas into the reaction container, the flue gas exhaust pipe is used to exhaust the flue gas in the reaction container, and the flue gas integration device is used to detect the carbon dioxide concentration of the reaction container.

[0006] Preferably, the reaction container is provided with an ultrasonic device.

[0007] Preferably, the inner wall of the reaction container is provided with a granular structure.

[0008] Preferably, a gas diffuser is provided at the bottom of the reaction container, one end of the gas diffuser is used to be connected to the flue gas inlet pipe, and the other end of the gas diffuser is provided with diffusion micropores, and the diffusion micropores are connected to the interior of the reaction container.

[0009] Preferably, the smoke integrated device is provided at the connection between the smoke circulation duct and the smoke exhaust duct, and the smoke integrated device includes a temperature detection module, a pressure detection module and a carbon dioxide concentration detection module.

[0010] Preferably, a fixed upper plate and a rotating lower plate are provided on the top of the reaction container, the fixed upper plate and the rotating lower plate are rotatably connected, and the rotating lower plate is connected to the reaction container; an auxiliary rotating rod, a rotating upper plate and a fixed lower plate are provided at the bottom of the reaction container, the auxiliary rotating rod is a hollow structure, and the auxiliary rotating rod can be respectively connected to the reaction container, the flue gas inlet pipe and the flue gas circulation pipe, the auxiliary rotating rod is connected to the rotating upper plate, and the rotating upper plate and the fixed lower plate are rotatably connected.

[0011] Preferably, the reaction container is provided with a pressure gauge and a pressure relief valve, and a buffer tube is provided between the pressure gauge and the reaction container.

[0012] Preferably, a feeding port is provided at the top of the reaction container, a discharging port is provided at the bottom of the reaction container, and a discharging valve is provided at the discharging port.

[0013] Preferably, the smoke inlet pipe is provided with a smoke inlet valve and an induced draft fan, the smoke circulation pipe is provided with a smoke circulation valve and a booster pump, and the smoke exhaust pipe is provided with a smoke exhaust valve.

[0014] The present invention provides a method for fixing carbon dioxide using the device for fixing carbon dioxide using fly ash from a power plant, comprising the following steps:

[0015] S1. Add fly ash and water into a reaction container in proportion, turn on the rotating device, and fully mix the materials to form a fly ash slurry;

[0016] S2, introducing the flue gas discharged from the thermal power plant into the flue gas pipeline and into the reaction container, so that the carbon dioxide in the flue gas and the alkaline substances in the fly ash slurry undergo a neutralization reaction;

[0017] S3. When the pressure in the reaction vessel reaches the design range, close the flue gas inlet pipe and open the flue gas circulation pipe;

[0018] S4, waiting for the fly ash slurry to fully react with the carbon dioxide in the flue gas;

[0019] S5. When the flue gas integrated device detects that the carbon dioxide concentration drops to a certain value and no longer changes, the flue gas circulation duct is closed, the flue gas exhaust duct is opened, and the remaining flue gas is discharged;

[0020] S6. When the pressure in the reaction container drops to 0, unloading is carried out.

[0021] Compared with the prior art, the present invention has achieved the following technical effects:

[0022] The present invention discloses a device and method for fixing carbon dioxide using fly ash from a power plant, which provides a new approach for fly ash utilization and carbon dioxide mineralization. The utilization of fly ash not only reduces the environmental burden, but also provides a low-cost CO2 fixation method. The application of the present invention will have a positive impact on environmental protection, energy conservation and climate change mitigation. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] 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.

[0024] Figure 1 It is a schematic diagram of a device for fixing carbon dioxide using fly ash from a power plant according to the present invention;

[0025] Figure 2 A top view of the internal structure of the reaction vessel of the present invention;

[0026] In the figure: 1. Smoke inlet pipe; 2. Smoke inlet valve; 3. Smoke circulation pipe; 4. Pressure pump; 5. Ultrasonic device 1; 6. Feeding port; 7. Rotating lower plate; 8. Fixed upper plate; 9. Smoke circulation valve; 10. Smoke integration device; 11. Smoke discharge pipe; 12. Smoke discharge valve; 13. Mechanical pressure gauge; 14. Pressure relief valve; 15. Particle structure; 16. Ultrasonic device 2; 17. Reaction vessel; 18. Discharge valve; 19. Discharge port; 20. Diffusion micropores; 21. Gas diffuser; 22. Rotating device; 23. Auxiliary rotating rod; 24. Rotating upper plate; 25. Load-bearing integrated platform; 26. Fixed lower plate; 27. Draft fan. DETAILED DESCRIPTION

[0027] 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.

[0028] The purpose of the present invention is to provide a device and method for fixing carbon dioxide using fly ash from a power plant, so as to solve the problems existing in the above-mentioned prior art, which is not only beneficial to environmental protection, but also can realize the effective utilization of resources.

[0029] 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.

[0030] Embodiment 1

[0031] like Figure 1 to Figure 2 As shown, this embodiment provides a device for fixing carbon dioxide using fly ash from a power plant, comprising: a reaction vessel 17, a rotating structure, a flue gas inlet pipe 1, a flue gas circulation pipe 3, a flue gas exhaust pipe 11 and a flue gas integrated device 10, wherein the rotating structure is used to drive the reaction vessel 17 to rotate clockwise or counterclockwise, and the rotating structure is controlled by a load-bearing integrated platform 25, one end of the flue gas inlet pipe 1, both ends of the flue gas circulation pipe 3 and one end of the flue gas exhaust pipe 11 can be respectively connected to the reaction vessel 17, the flue gas inlet pipe 1 is used to introduce flue gas into the reaction vessel 17, the flue gas exhaust pipe 11 is used to discharge the flue gas in the reaction vessel 17, and the flue gas integrated device 10 is used to detect the carbon dioxide concentration of the reaction vessel 17.

[0032] Specifically, in this embodiment, an ultrasonic device is disposed outside the reaction container 17. Preferably, there are two ultrasonic devices, which are symmetrically disposed on both sides of the reaction container 17, namely, ultrasonic device 1 5 and ultrasonic device 2 16.

[0033] In this embodiment, the inner wall of the reaction vessel 17 is provided with a rough particle structure 15, which is convenient for stirring and dispersing fly ash and water; the reaction vessel 17 is provided with a mechanical pressure gauge 13 and a pressure relief valve 14, and a buffer tube is provided between the mechanical pressure gauge 13 and the reaction vessel 17; the top of the reaction vessel 17 is provided with a feeding port 6, the lower part of the reaction vessel 17 is provided with a discharge port 19, and the discharge port 19 is provided with a discharge valve 18.

[0034] In this embodiment, a gas diffuser 21 is provided at the bottom of the reaction container 17. The material of the gas diffuser 21 is mainly rigid and corrosion-resistant. One end of the gas diffuser 21 is used to connect with the flue gas inlet pipe 1, and the other end of the gas diffuser 21 is provided with diffusion micropores 20. The diffusion micropores 20 are connected to the interior of the reaction container 17, and the diameter of the diffusion micropores 20 is about 0.3 mm.

[0035] In this embodiment, a fixed upper plate 8 and a rotating lower plate 7 are provided on the top of the reaction container 17, and the fixed upper plate 8 and the rotating lower plate 7 are both coaxially arranged with the reaction container 17, the fixed upper plate 8 and the rotating lower plate 7 are rotatably connected, and the rotating lower plate 7 is connected to the reaction container 17; an auxiliary rotating rod 23, a rotating upper plate 24 and a fixed lower plate 26 are provided at the bottom of the reaction container 17, the auxiliary rotating rod 23, the rotating upper plate 24 and the fixed lower plate 26 are all coaxially arranged with the reaction container 17, the auxiliary rotating rod 23 is located at the central position of the bottom of the reaction container 17, the auxiliary rotating rod 23 is a hollow structure, the auxiliary rotating rod 23 can be respectively connected with the reaction container 17, the flue gas inlet pipe 1 and the flue gas circulation pipe 3, the auxiliary rotating rod 23 is threadedly connected with the rotating upper plate 24, and the rotating upper plate 24 and the fixed lower plate 26 are rotatably connected.

[0036] In this embodiment, the smoke inlet pipe 1, the smoke circulation pipe 3 and the smoke exhaust pipe 11 are all made of acid gas corrosion resistant materials; the smoke inlet pipe 1 is provided with a smoke inlet valve 2 and an induced draft fan 27, the smoke circulation pipe 3 is provided with a smoke circulation valve 9 and a booster pump 4, and the smoke exhaust pipe 11 is provided with a smoke exhaust valve 12. The smoke inlet valve 2, the smoke circulation valve 9, the smoke exhaust valve 12 and the discharge valve 18 have both manual operation mode and automatic control mode.

[0037] In this embodiment, the smoke inlet valve 2, the booster pump 4, the ultrasonic device 1 5, the smoke circulation valve 9, the smoke discharge valve 12, the pressure relief valve 14, the ultrasonic device 2 16, the unloading valve 18, and the induced draft fan 27 can all be automatically controlled by an editable logic controller or a distributed control system.

[0038] In this embodiment, a flue gas integrated device 10 is provided at the connection between the flue gas circulation duct 3 and the flue gas exhaust duct 11. The flue gas integrated device 10 is connected to the fixed upper plate 8. The flue gas integrated device 10 includes a temperature detection module, a pressure detection module, a carbon dioxide concentration detection module and a control module for the flue gas inlet valve 2, the flue gas circulation valve 9 and the flue gas exhaust valve 12.

[0039] The smoke inlet channel of this embodiment is used to communicate with the bottom of the reaction container 17, and the smoke inlet channel is connected to the smoke circulation channel. When in use, the smoke enters the gas diffuser 21 through the smoke inlet pipe 1, the fixed lower plate 26, the rotating upper plate 24, and the auxiliary rotating rod 23, and enters the reaction container 17 in an aerated manner through the diffusion micropores 20, reacts with fly ash and water in the reaction container 17, and then passes through the rotating lower plate 7 and the fixed upper plate 8 at the top of the reaction container 17, and enters the smoke circulation pipe 3 or the smoke exhaust pipe 11. During use, the rotating device 22 drives the reaction container 17 to rotate, so that the fly ash and water are mixed, and the ultrasonic device further enhances the mixing effect.

[0040] This embodiment not only reduces the environmental burden by utilizing fly ash, but also provides a low-cost CO2 fixation method; the application of the ultrasonic device further improves the reaction efficiency, and provides a new technical approach for the resource utilization of fly ash and carbon dioxide emission reduction measures. The application of this embodiment will have a positive impact on environmental protection, energy conservation and climate change mitigation.

[0041] Embodiment 2

[0042] This embodiment provides a method for fixing carbon dioxide using the device for fixing carbon dioxide using fly ash from a power plant according to the first embodiment, comprising the following steps:

[0043] S1. Add fly ash and water into the reaction vessel 17 in proportion. Fly ash is one of the main solid wastes generated in the combustion process of coal-fired power plants. Its main components include silicon dioxide, aluminum oxide and a small amount of calcium oxide. The ratio of fly ash to water is 1:3 to 1:3.12. First, add water at one time, and then add fly ash in batches to ensure that the materials are mixed evenly. The total volume of the materials does not exceed three quarters of the volume of the reaction vessel 17. Turn on the rotating device 22 and the ultrasonic device to fully mix the materials to form a fly ash slurry.

[0044] S2. Open the flue gas inlet valve 2. The flue gas inlet speed should be 1m / s to 1.2m / s. Then open the induced draft fan 27 to introduce the flue gas discharged from the thermal power plant into the flue gas inlet pipe 1 and enter the reaction vessel 17 through the gas diffuser 21 in an aerated manner, so that the carbon dioxide in the flue gas reacts with the alkaline substances in the fly ash slurry to neutralize. The calcium oxide (CaO) and magnesium oxide (MgO) in the fly ash react with the carbon dioxide to form calcium carbonate (CaCO3) and magnesium carbonate (MgCO3), which can effectively convert the carbon dioxide into a chemically stable mineral form;

[0045] S3. When the pressure in the reaction vessel 17 reaches the design range (1MPa-1.2MPa), close the flue gas inlet pipe 1, open the flue gas circulation valve 9, and at the same time, start the booster pump 4;

[0046] S4, waiting for the fly ash slurry to fully react with the carbon dioxide in the flue gas;

[0047] S5. When the flue gas integrated device 10 detects that the carbon dioxide concentration drops to a certain value and does not change, the booster pump 4, the induced draft fan 27 and the flue gas circulation valve 9 are turned off, and the flue gas discharge valve 12 is opened to discharge the remaining flue gas;

[0048] S6. Check the pressure in the reaction container 17. When the pressure in the reaction container 17 drops to 0, open the discharge valve 18 to discharge the reaction materials, and close the rotating device 22 and the ultrasonic device.

[0049] The method of this embodiment can reduce the carbon dioxide content in the flue gas emitted by thermal power plants, weaken the greenhouse effect, and achieve the effect of treating waste with waste.

[0050] 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 device for fixing carbon dioxide using fly ash from a power plant, characterized in that: include: A reaction container, a rotating structure, a flue gas inlet pipe, a flue gas circulation pipe, a flue gas exhaust pipe and a flue gas integrated device, wherein the rotating structure is used to drive the reaction container to rotate, one end of the flue gas inlet pipe, both ends of the flue gas circulation pipe and one end of the flue gas exhaust pipe can be connected to the reaction container respectively, the flue gas inlet pipe is used to introduce flue gas into the reaction container, the flue gas exhaust pipe is used to exhaust the flue gas in the reaction container, and the flue gas integrated device is used to detect the carbon dioxide concentration of the reaction container.

2. The device for fixing carbon dioxide using fly ash from a power plant according to claim 1, characterized in that: The reaction container is provided with an ultrasonic device.

3. The device for fixing carbon dioxide using fly ash from a power plant according to claim 1, characterized in that: The inner wall of the reaction container is provided with a particle structure.

4. The device for fixing carbon dioxide using fly ash from a power plant according to claim 1, characterized in that: A gas diffuser is arranged at the bottom of the reaction container, one end of the gas diffuser is used to be connected to the flue gas inlet pipe, and the other end of the gas diffuser is arranged with diffusion micropores, and the diffusion micropores are connected to the interior of the reaction container.

5. The device for fixing carbon dioxide using fly ash from a power plant according to claim 1, characterized in that: The smoke integrated device is arranged at the connection between the smoke circulation pipeline and the smoke exhaust pipeline, and the smoke integrated device comprises a temperature detection module, a pressure detection module and a carbon dioxide concentration detection module.

6. The device for fixing carbon dioxide using fly ash from a power plant according to claim 1, characterized in that: A fixed upper plate and a rotating lower plate are arranged on the top of the reaction container, the fixed upper plate and the rotating lower plate are rotatably connected, and the rotating lower plate is connected to the reaction container; an auxiliary rotating rod, a rotating upper plate and a fixed lower plate are arranged on the bottom of the reaction container, the auxiliary rotating rod is a hollow structure, and the auxiliary rotating rod can be respectively communicated with the reaction container, the flue gas inlet pipe and the flue gas circulation pipe, the auxiliary rotating rod is connected to the rotating upper plate, and the rotating upper plate and the fixed lower plate are rotatably connected.

7. The device for fixing carbon dioxide using fly ash from a power plant according to claim 1, characterized in that: The reaction container is provided with a pressure gauge and a pressure relief valve, and a buffer tube is provided between the pressure gauge and the reaction container.

8. The device for fixing carbon dioxide using fly ash from a power plant according to claim 1, characterized in that: The top of the reaction container is provided with a feeding port, the lower part of the reaction container is provided with a discharging port, and the discharging port is provided with a discharging valve.

9. The device for fixing carbon dioxide using fly ash from a power plant according to claim 1, characterized in that: The smoke inlet pipe is provided with a smoke inlet valve and an induced draft fan, the smoke circulation pipe is provided with a smoke circulation valve and a pressure pump, and the smoke exhaust pipe is provided with a smoke exhaust valve.

10. A method for fixing carbon dioxide using the device for fixing carbon dioxide using fly ash from a power plant according to any one of claims 1 to 9, characterized in that: The following steps are involved: S1. Add fly ash and water into a reaction container in proportion, turn on the rotating device, and fully mix the materials to form a fly ash slurry; S2, introducing the flue gas discharged from the thermal power plant into the flue gas pipeline and into the reaction container, so that the carbon dioxide in the flue gas and the alkaline substances in the fly ash slurry undergo a neutralization reaction; S3. When the pressure in the reaction vessel reaches the design range, close the flue gas inlet pipe and open the flue gas circulation pipe; S4, wait for the fly ash slurry to fully react with the carbon dioxide in the flue gas; S5. When the flue gas integrated device detects that the carbon dioxide concentration drops to a certain value and does not change, the flue gas circulation duct is closed, the flue gas exhaust duct is opened, and the remaining flue gas is discharged; S6. When the pressure in the reaction container drops to 0, unloading is carried out.

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