Equipment for capturing CO2 from alkaline solid waste

Abstract

The invention relates to equipment for capturing CO2 from alkaline solid waste. The rear end of a cabin is in a taper shape to form self-sealing; the inner shaft moves back and forth in the hollow shaft according to the rotation of the hand wheel to drive the movable connecting rod to rotate, so that the movable blades rotate, the spiral structures of the movable blades and the fixed spiral blades are staggered, the continuity of the spiral structures is destroyed, the backward moving speed of alkaline solid waste is reduced, the reaction time of the alkaline solid waste and waste gas is prolonged, and the carbon capture efficiency is greatly improved; when resetting is needed, resetting can be easily achieved by rotating the hand wheel, use is convenient, the pH of the alkaline solid waste can be reduced through CO2 trapping, the application range of the alkaline solid waste is expanded, and recycling and high-quality utilization of waste are achieved.

Description

Technical Field

[0001] This invention relates to the field of carbon neutrality technology, specifically to a device for capturing CO2 from alkaline solid waste. Background Technology

[0002] The massive accumulation and improper disposal of solid waste have placed a heavy burden on the environment. The dumping of various industrial solid wastes, construction wastes, and household garbage not only occupies vast amounts of valuable land resources but also easily leads to environmental problems such as soil pollution, water pollution, and air pollution. If these solid wastes are not effectively treated for a long time, the harmful substances within them will seep into the soil through natural processes such as rainwater leaching and weathering, disrupting the ecological balance and endangering human health.

[0003] In recent years, research on CO2 capture using solid waste has provided new insights into solving the aforementioned problems. Many solid wastes, such as steel slag, carbide slag, and fly ash, contain large amounts of alkaline compounds, possessing strong CO2 capture capabilities, and are widely available and abundant. Utilizing these solid wastes to capture CO2 through appropriate technologies can not only effectively reduce CO2 emissions but also generate valuable compounds, achieving resource utilization of solid waste—a win-win situation. Related research indicates that a unit of solid waste can neutralize a considerable amount of CO2, demonstrating significant emission reduction potential. However, currently, the lack of efficient specialized equipment in the field of CO2 capture using solid waste limits the large-scale promotion and application of this technology. Most existing treatment methods are still in the laboratory research or pilot-scale stages and cannot meet the needs of industrial-scale treatment. Therefore, developing equipment and methods for capturing CO2 from alkaline solid waste will fill this gap and has broad application prospects. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a device for capturing CO2 from alkaline solid waste.

[0005] A device for capturing CO2 from alkaline solid waste includes a hollow chamber, a hollow shaft, fixed spiral blades, hinged blades, a hinged blade rotation mechanism, and a shaft drive motor. The hollow chamber has a material outlet at its front end and a material inlet and a waste gas inlet at its upper end. A hollow shaft is horizontally positioned along the central axis of the hollow chamber's cavity, passing through the rear end of the chamber and connecting to the shaft drive motor. Fixed spiral blades and hinged blades are located on the outer side of the hollow shaft. The shaft drive motor drives the hollow shaft to rotate, causing the fixed spiral blades and hinged blades to rotate together, pushing the alkaline solid waste input through the material inlet towards the rear inlet to react with the flue gas entering through the waste gas inlet and capture CO2. The hinged blades are connected to the hinged blade rotation mechanism, which, through adjustment, can rotate relative to the fixed spiral blades. This misalignment of the spiral structure between the hinged blades and the fixed spiral blades disrupts the continuity of the spiral structure, reducing the backward movement speed of the alkaline solid waste and increasing the reaction time between the alkaline solid waste and the waste gas.

[0006] Furthermore, the hinge rotation mechanism includes a handwheel, an inner shaft, and an L-shaped connecting rod. The inner shaft is embedded in the central cavity of the hollow shaft and extends to the rear end of the hollow shaft. The rear end of the hollow shaft is threadedly connected to the handwheel. The outer side of the inner shaft is rotatably connected to the horizontal section of the L-shaped connecting rod. The vertical section of the L-shaped connecting rod is fixedly connected to the hinge. By rotating the handwheel, the inner shaft can be moved back and forth, and the horizontal section of the L-shaped connecting rod can be rotated around the vertical section, thereby causing the hinge to rotate, so that the hinge is misaligned with the helical structure of the fixed helical blade.

[0007] Furthermore, the front end of the hollow cabin is tapered to form a self-sealing structure.

[0008] Furthermore, the shaft drive motor is connected to the hollow shaft via a gear differential structure.

[0009] The beneficial effects of this invention are as follows: The rear end of the chamber adopts a tapered shape to form a self-sealing structure; the inner shaft is inside a hollow shaft and moves back and forth according to the rotation of the handwheel, driving the movable connecting rod to rotate, which in turn causes the movable blade to rotate, causing the spiral structure of the movable blade and the fixed spiral blade to be misaligned, disrupting the continuity of the spiral structure, reducing the backward movement speed of alkaline solid waste, increasing the reaction time between alkaline solid waste and waste gas, and significantly improving carbon capture efficiency. When reset is needed, it can also be easily achieved by rotating the handwheel, making it convenient to use. The capture of CO2 can reduce the pH of alkaline solid waste, expand the application range of alkaline solid waste, and realize the resource utilization and high-quality utilization of waste. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 Schematic diagram of carbon-fixing stirring shaft assembly; Figure 3 This is a schematic diagram showing the hinged sheet welded component in the disconnected state. Figure 4 A schematic diagram of the hollow stirring shaft and inner shaft for carbon fixation; Figure 5 Left view of a carbon fixation stirrer and schematic diagram of its internal parts; Figure 6 The pH change curve of fly ash with 20% moisture content absorbing CO2 under normal operating conditions; Figure 7 The CO2 absorption capacity of fly ash with a moisture content of 20%.

[0011] The attached diagram lists the components represented by each number as follows: 1. Rotary shaft drive motor; 2. Pinion gear; 3. Large gear; 4. Hollow shaft; 5. Handwheel; 6. Hollow chamber; 7. Fixed spiral blades; 8. Material outlet; 9. Flue gas inlet; 10. Material input inlet; 11. Water inlet; 12. Flue gas outlet; 13. Inner shaft; 14. Connecting rod; 15. Hinged blades Detailed Implementation

[0012] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0013] like Figure 1As shown, this invention provides a device for capturing CO2 from alkaline solid waste, including a shaft drive motor 1, a small gear 2, a large gear 3, a hollow shaft 4, a handwheel 5, a chamber 6, fixed spiral blades 7, a material outlet 8, a flue gas inlet 9, a material inlet 10, a water inlet 11, a flue gas outlet 12, an inner shaft 13, a connecting rod 14, and a hinged blade 15. During operation, the small gear 2 drives the large gear 3 via the shaft drive motor 1 to achieve differential motion. The large gear 3 drives the hollow shaft 4, which houses the inner shaft 13. The inner shaft 13 is connected to the handwheel 5, which controls its rotation. The hollow shaft 4 is equipped with fixed spiral blades 7 and a movable connecting rod 14. The device is driven by the linkage between the inner shaft 13 and the hollow shaft 4. The operation of the fixed spiral blade 7 is controlled by a hinged blade welded part 15 mounted on the connecting rod 14. The connecting rod 14 is connected to the handwheel 5 via the inner shaft 13. The handwheel 5 controls the operation of the inner shaft 13 to manipulate the connecting rod 14 to drive the hinged blade 15 to complete the full fusion and absorption of materials. The flue gas first enters the chamber 6 through the flue gas inlet 9, making it fully occupy the space of the chamber 6. Then, the materials enter the chamber 6 through the material inlet 10, and the water enters the chamber 6 through the water inlet 11. The two are stirred and fused together. During this period, the handwheel 5 can be operated to rotate the hinged blade 15 to block the advancing materials, making them stay for a longer time and better absorb CO2. Finally, the materials are discharged from the chamber 6 through the material outlet 8, and the remaining gas can be discharged from the chamber 6 through the flue gas outlet 12.

[0014] like Figure 2-5 The hollow shaft 4 has an inner shaft 13 installed inside, and a fixed spiral blade 7 is installed on the hollow shaft 4. A connecting rod 14 and a hinged piece 15 are installed on the inner shaft 13. A large gear 3 is provided on the left side of the hollow shaft 4, and a handwheel 5 is provided on the left side of the large gear 3. The inner shaft 13 is connected to the handwheel 5, and the connecting rod 14 is connected to the handwheel 5 through the inner shaft 13.

[0015] When the operator controls the handwheel 5, the hinged welded part 15 rotates, which can block the material moving forward, thus achieving full fusion and absorption of the material and flue gas. An inner shaft 13 is installed inside the hollow shaft 4. When the machine is working, the inner shaft 13 moves back and forth within the hollow shaft 4.

[0016] like Figure 1 , Figure 5 On the left side of the chamber 6, a small gear 2 and a large gear 3 are installed. A handwheel 5 is installed in front of the large gear 3. A flue gas inlet 9, a material inlet 10, a water inlet 11, and a flue gas outlet 12 are fixedly installed on the upper part of the chamber 6, which lead directly into the chamber 6. Inside the chamber 6, there is an inner shaft 13, a fixed spiral blade 7, a connecting rod 14, and a hinged welded part 15. The inner shaft 13 is connected to the handwheel 5. The connecting rod 14 is equipped with the hinged welded part 15. The connecting rod 14 is connected to the handwheel 5 through the inner shaft 13.

[0017] When the machine is running, the small gear 2 drives the large gear 3 to complete differential motion. Then, according to the rotation of the handwheel 5, the movable connecting rod 14 is rotated, which in turn causes the movable blade 15 to rotate. The operator puts flue gas into the flue gas inlet 9, which allows the flue gas to fully occupy a favorable position. Then, the operator pours material and water into the material inlet 10 and water inlet 11 respectively. The two are stirred in the chamber 6. The operator operates the handwheel 5 to make the movable blade 15 rotate and block the material that is constantly moving in the chamber 6, so that it can react and absorb better. Finally, the remaining flue gas is discharged from the chamber 6 through the flue gas outlet 12. Example

[0018] This case study uses fly ash as an example: its moisture content is 20%, and under normal operating conditions (i.e., no stirring, low interfacial reaction contact area), the pH value of the system can be reduced from 14 to below 8 in 40 minutes. Figure 6 Using the device of this invention, the pH can be rapidly reduced to below 8 within 25 minutes. This is because the device incorporates a fixed spiral blade 7 capable of stirring and propulsion. Compared to conventional operating conditions, during the stirring and propulsion process, the CO2 in the flue gas has a significantly larger contact area with the fly ash and remains relatively stationary. This allows sufficient reaction time for the CO2 and fly ash to fully absorb the CO2 from the flue gas. Furthermore, the fixed spiral blade 7 also includes a movable blade 15. When the pH of the fly ash does not meet the requirements, it can only stir without propelling the fly ash forward, allowing more CO2 to enter the reaction system. In this case, the fly ash can react with more CO2, rapidly reducing the pH.

[0019] Furthermore, during the operation of the fixed spiral blade 7, the fly ash is continuously pushed forward and accumulates in front of the material output interface 8. Due to the bucket-shaped structure, the fly ash volume is compressed and becomes more compact. At this time, the flue gas is blocked and cannot be discharged from the material output interface 8, remaining in the reaction chamber. The continuous input of flue gas increases the pressure inside the chamber 6. Under pressurized conditions, the reaction between CO2 and fly ash is accelerated. Therefore, the pH of the system can be reduced to below 8 in about 25 minutes, and the reaction time is shortened by 37.5% compared with the reaction time of the traditional system.

[0020] If we disregard the effective pH reduction of fly ash and focus solely on carbon emission reduction, experimental results show that fly ash with a moisture content of 20% absorbs approximately 60 g-CO2 / kg-fly ash ( Figure 7 For one cubic meter of coal-fired flue gas, when the flue gas contains 20% CO2, at 25 ℃, the device of the present invention only needs to consume 5.6 kg of the above-mentioned fly ash to reduce the CO2 concentration in the flue gas to below 5%, thereby achieving effective control of the CO2 concentration in the flue gas.

[0021] It is worth noting that the entire device is controlled by a main control button and its handwheel. Since the devices that match the control button and handwheel are common devices and belong to existing common knowledge technology, their electrical connection relationship and specific circuit structure will not be described in detail here.

[0022] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, the phrase "comprising an element defined as..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0023] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A device for capturing CO2 from alkaline solid waste, characterized in that, The device includes a hollow chamber, a hollow shaft, fixed spiral blades, hinged blades, a hinged blade rotation mechanism, and a shaft drive motor. The hollow chamber has a material outlet at its front end and a material inlet and a waste gas inlet at its upper end. A hollow shaft is horizontally positioned along the central axis of the hollow chamber's cavity, passing through the rear end of the chamber and connecting to the shaft drive motor. Fixed spiral blades and hinged blades are located on the outer side of the hollow shaft. The shaft drive motor drives the hollow shaft to rotate, causing the fixed spiral blades and hinged blades to rotate together, pushing the alkaline solid waste input at the material inlet towards the rear inlet to react with the flue gas entering at the waste gas inlet and capture CO2. The hinged blades are connected to the hinged blade rotation mechanism, which, through adjustment, can rotate the hinged blades relative to the fixed spiral blades, causing misalignment of the spiral structure between the hinged blades and the fixed spiral blades, disrupting the continuity of the spiral structure, reducing the backward movement speed of the alkaline solid waste, and increasing the reaction time between the alkaline solid waste and the waste gas.

2. The equipment for capturing CO2 from alkaline solid waste according to claim 1, characterized in that, The hinge rotation mechanism includes a handwheel, an inner shaft, and an L-shaped connecting rod. The inner shaft is embedded in the central cavity of the hollow shaft and extends to the rear end of the hollow shaft. The rear end of the hollow shaft is threadedly connected to the handwheel. The outer side of the inner shaft is rotatably connected to the horizontal section of the L-shaped connecting rod. The vertical section of the L-shaped connecting rod is fixedly connected to the hinge. By rotating the handwheel, the inner shaft can be moved back and forth, and the horizontal section of the L-shaped connecting rod can be rotated around the vertical section, thereby causing the hinge to rotate, so that the hinge is misaligned with the helical structure of the fixed helical blade.

3. The device for capturing CO2 from alkaline solid waste according to claim 1, characterized in that, The front end of the hollow cabin is tapered to form a self-sealing structure.

4. The equipment for capturing CO2 from alkaline solid waste according to claim 1, characterized in that, The rotating shaft drive motor is connected to the hollow shaft through a gear differential structure.

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