Micro-nano bubble reinforced system for mineralizing carbon dioxide by base solid waste and application method of micro-nano bubble reinforced system

Abstract

The invention discloses a system for mineralizing carbon dioxide by micro-nano bubble reinforced base solid waste and an application method.The system for mineralizing carbon dioxide by micro-nano bubble reinforced base solid waste comprises a micro-nano bubble generation and injection unit, a mineralization reaction unit and a circulating water treatment unit, the micro-nano bubble generation and injection unit comprises a micro-nano bubble generation device, a gas supply pipeline and a water supply pipeline, the mineralization reaction unit comprises a mineralization reactor, and a quartz sand filling layer and a nylon screen are arranged at the bottom of the mineralization reactor. Through the multi-unit integrated coupling design, the micro-nano bubbles are creatively utilized to strengthen the gas-liquid-solid three-phase synergistic reaction process, the column type filling structure and the sectional type reaction mechanism are combined, the carbon dioxide mass transfer efficiency and the mineralization reaction rate are effectively improved, and the system has the advantages of being high in system adaptability, stable in continuous operation, flexible in module deployment and the like; the method is suitable for efficient treatment of alkaline solid waste and carbon dioxide sequestration collaborative scenes, and has good engineering popularization prospects and resource utilization value.

Description

Technical Field

[0001] The present invention belongs to the technical field of carbon dioxide collection, and in particular relates to a system and an application method for micro-nano bubble enhanced alkaline solid waste mineralization of carbon dioxide. Background Art

[0002] As global climate change intensifies, the capture, storage, and resource utilization of carbon dioxide (CCUS) has become a key technological path to achieving the "dual carbon" goals. Among them, mineralization storage has attracted widespread attention due to its stable products, long-term storage, safety, and environmental protection. Industrial solid wastes rich in alkaline earth metal ions, such as fly ash, steel slag, and red mud, are ideal mineralization raw materials. They not only enable solid-state storage of carbon dioxide, but also allow the mineralization products to be used in scenarios such as foundation filling and mine backfill, promoting the coordinated development of carbon emission reduction and solid waste reduction, harmlessness, and resource utilization.

[0003] Research on the mineralization of carbon dioxide from alkaline solid waste has been widely reported, but traditional three-phase gas-liquid-solid mineralization systems still face numerous bottlenecks: low solubility of carbon dioxide in water and slow gas-liquid mass transfer rates limit the efficiency of the mineralization reaction. For example, the published patent number CN 118545951B, entitled "A Nanocomposite Excitation Solution Enhanced Solid Waste Material Mineralization Method and Application," improves the reaction rate to some extent, but its high cost and complex system make industrial application difficult.

[0004] Due to their large specific surface area, strong interfacial activity, and self-pressurized dissolution, micro-nano bubbles show good application prospects in gas dissolution and interfacial reactions. In scenarios such as the published patent number CN 102765797B or the patent number CN109304108B, the above-mentioned technical solutions are mostly targeted at liquid-gas two-phase systems, with the application purpose of improving dissolved oxygen efficiency or pollutant degradation capacity, which is significantly different from the three-phase reaction characteristics and material adaptability of the alkaline solid waste mineralization carbon dioxide process. In the alkaline solid waste mineralization carbon dioxide process, in addition to solving the problem of gas mass transfer efficiency in water, it is also necessary to take into account the multi-phase synergistic reaction mechanism such as the surface reactivity of solid waste particles, metal ion dissolution behavior, and carbonate precipitation in the mineralization reaction, which places higher requirements on the reaction environment and bubble behavior. At present, there is still a lack of structured systems that can effectively integrate micro-nano bubble technology into such mineralization processes. In particular, in terms of achieving efficient generation and uniform injection of micro-nano bubbles, sufficient contact reaction with the solid waste mineralization medium, and optimizing the spatial configuration of the reaction area, the existing technology has not yet formed a mature and feasible solution.

[0005] Therefore, in response to the above technical problems, it is necessary to provide a system and application method for micro-nano bubble enhanced alkaline solid waste mineralization of carbon dioxide.

[0006] The information disclosed in this background technology section is only intended to enhance understanding of the overall background of the invention and should not be regarded as an admission or any form of suggestion that the information constitutes the prior art already known to a person skilled in the art. Summary of the Invention

[0007] The purpose of the present invention is to provide a system and application method for micro-nano bubble enhanced alkaline solid waste mineralization of carbon dioxide. It can innovatively utilize micro-nano bubbles to enhance the gas-liquid-solid three-phase synergistic reaction process through a multi-unit integrated coupling design, and combine the columnar filling structure with the segmented reaction mechanism to effectively improve the carbon dioxide mass transfer efficiency and the mineralization reaction rate. It has the advantages of strong system adaptability, stable continuous operation, and flexible module deployment. It is suitable for the coordinated scenarios of efficient treatment of alkaline solid waste and carbon dioxide sequestration, and has good engineering promotion prospects and resource utilization value.

[0008] In order to achieve the above object, a technical solution provided by a specific embodiment of the present invention is as follows:

[0009] The system for enhancing the mineralization of carbon dioxide from alkaline solid waste using micro-nano bubbles includes a micro-nano bubble generation and injection unit, a mineralization reaction unit, and a circulating water treatment unit. The micro-nano bubble generation and injection unit includes a micro-nano bubble generation device, an air supply pipeline, and a water supply pipeline. The mineralization reaction unit includes a mineralization reactor, a quartz sand filling layer and a nylon screen are provided at the bottom of the reactor. The mineralization reaction unit is connected to the micro-nano bubble generation and injection unit. The circulating water treatment unit includes a circulating water pool, a circulating pump, a circulating water pool outlet gate, and a supplementary water pipeline. A pair of opposite end faces of the supplementary water pipeline are respectively provided with a supplementary water gate and a surfactant addition port. The circulating water pool is filled with a surfactant.

[0010] In one or more embodiments of the present invention, the upper end face of the micro-nano bubble generating device is provided with an air inlet of the micro-nano bubble generating device, the water supply pipeline includes a water inlet of the micro-nano bubble generating device and a water inlet valve of the micro-nano bubble generating device, the water inlet of the micro-nano bubble generating device is connected to the output end of the circulating water treatment unit, the air supply pipeline includes an air gas valve, an air gas flow meter, a carbon dioxide gas valve and a carbon dioxide gas flow meter, and the air gas valve, air gas flow meter, carbon dioxide gas valve and carbon dioxide gas flow meter are all connected to the air inlet of the micro-nano bubble generating device.

[0011] In one or more embodiments of the present invention, the micro-nano bubble generating device is connected to an air gas pipeline and a carbon dioxide gas supply pipeline, and the gas flow is respectively regulated by an air inlet valve and a flowmeter before being introduced into the micro-nano bubble generating device. The micro-nano bubble generating device includes an outer shell, a venturi tube, a gas-liquid mixing pump, a dissolved air pressure tank, and a micro-nano bubble nozzle. The outer shell is provided with a venturi tube, the gas-liquid mixing pump is connected to the upstream of the venturi tube, and the dissolved air pressure tank is connected to the downstream of the venturi tube. The outer shell is provided with at least one micro-nano bubble nozzle. The water outlet of the micro-nano bubble generating device is connected to a micro-nano bubble water transfer tank. The inner wall end surface of the micro-nano bubble water transfer tank is provided with a first liquid phase carbon dioxide concentration sensor, a first gas phase carbon dioxide concentration sensor, and a pH online meter. One side end surface of the micro-nano bubble water transfer tank is sequentially connected to the micro-nano bubble water transfer tank outlet valve and a first booster pump. One side end surface of the first booster pump is provided with a first liquid flow meter.

[0012] In one or more embodiments of the present invention, the micro-nano bubble generation and injection unit also includes a laser particle size analyzer, which is arranged on the inner wall end face of the micro-nano bubble water transfer tank, and the mineralization reaction unit also includes a mineralization reactor water inlet gate, a mineralization reactor feed inlet electric gate valve, a mineralization reactor discharge port electric gate valve, a solid waste material bin, a first belt weighing feeder, a screw feeding device, a first variable frequency motor, an electric motor and a reducer.

[0013] In one or more embodiments of the present invention, the micro-nano bubble enhanced alkaline solid waste mineralization carbon dioxide system further includes a flue gas pretreatment and cooling module and a carbon dioxide separation module.

[0014] In one or more embodiments of the present invention, a mineralization reactor water inlet and a mineralization reactor feed inlet electric gate valve are sequentially provided on the top end face of the mineralization reactor, a mineralization reactor feed port is provided on the top end face of the mineralization reactor feed inlet electric gate valve, a first belt weighing feeder is provided on one side end face of the mineralization reactor, a solid waste material bin is provided on the upper side end face of the first belt weighing feeder, the mineralization reactor feed port is located on the upper side end face of the first belt weighing feeder, a front section sampling port, a middle section sampling port and a mineralization reactor discharge port electric gate valve are sequentially provided on the bottom end face of the mineralization reactor, a mineralization reactor discharge port is provided on the bottom end face of the mineralization reactor discharge port electric gate valve, a mineralization reactor water inlet gate is provided between the mineralization reactor water inlet and the first booster pump, a temperature sensor, a first pressure sensor and an ultrasonic level meter are provided on the internal end face of the mineralization reactor, the first belt weighing feeder is driven by a first variable frequency motor, and the spiral feeding device is driven by an electric motor and a reducer.

[0015] In one or more embodiments of the present invention, the circulating water treatment unit also includes a mesh water filter, a second gaseous carbon dioxide concentration sensor and a second liquid flow meter. The inner wall end faces of the circulating water pool are respectively provided with a second gaseous carbon dioxide concentration sensor, a second liquid carbon dioxide concentration sensor and a second pressure sensor. One side end face of the circulating water pool is respectively connected to the water supply gate, the water supply pipeline and the surfactant addition port in sequence. The lower side end face of the circulating water pool located at the water supply gate is respectively connected to the circulating water pool outlet gate, the circulation pump, the mesh water filter and the second liquid flow meter in sequence.

[0016] In one or more embodiments of the present invention, the mineralized product processing unit includes a mineralized product silo, a second belt weighing feeder, a second frequency conversion motor, a slurry mixing tank, a slurry mixing water supply gate, a first slurry pump, a second slurry pump, a second booster pump and a jet nozzle. A vibrating online viscometer is provided on one end face of the slurry mixing tank. The jet nozzle is connected to the slurry mixing water supply pipeline and the second slurry pump. The jet nozzle is arranged in the slurry mixing tank. The jet nozzle is connected to the second booster pump and the slurry mixing water supply gate in sequence. A second belt weighing feeder and a mineralized product silo are provided on one end face of the slurry mixing tank. The discharge port of the mineralization reactor is aligned with the mineralized product silo. The second belt weighing feeder is connected to the second frequency conversion motor. An electric gate valve for the mineralized product discharge port and a second slurry pump are respectively provided on one end face of the slurry mixing tank. The first slurry pump is located between the vibrating online viscometer and the slurry mixing tank.

[0017] In one or more embodiments of the present invention, the mineralization reactor is an upright columnar reactor, which includes an upright columnar reactor micro-nano bubble water injection component. The upright columnar reactor micro-nano bubble water injection component is provided with a plurality of upright columnar reactor filling ports, and the number of the upright columnar reactor filling ports is 3 to 5. The bottom of the upright columnar reactor filling port is sequentially provided with a detachable flange, an upright columnar reactor quartz sand filling section, an upright columnar reactor nylon screen, and a reactor base. The bottom of the reactor base is provided with a upright columnar reactor water outlet. The quartz sand particle size of the upright columnar reactor quartz sand filling section is 0.1-1.2 mm, and the filling thickness is 100-1000 mm.

[0018] An application method of a system for enhancing the mineralization of carbon dioxide from alkaline solid waste by micro-nano bubbles, comprising the following steps:

[0019] S1: Start the first belt weighing feeder and the first variable frequency motor to deliver the alkali solid waste to the feeding port of the mineralization reactor;

[0020] S2: Start the motor, reducer and electric gate valve at the inlet of the mineralization reactor, and fill the dry alkaline solid waste material into the mineralization silo through the spiral feeding device. According to the requirements of the reaction conditions, start the air compressor to compact the solid waste material to form a dense solid reaction bed, or provide the required pressure environment for the reaction process.

[0021] S3: Turn on the air pressure pump, carbon dioxide gas supply pipeline, water supply pipeline, circulation pump and micro-nano bubble generating device to prepare micro-nano bubble water. Turn on the first booster pump and inject the micro-nano bubble water from the water inlet of the mineralization reactor. The bubbles fully react with the alkaline solid waste during the process of passing through the solid waste filler layer. The reaction liquid overflows from the water outlet of the mineralization reactor and passes through the screen water filter to remove particulate impurities. It then returns to the circulating water treatment unit, realizing the liquid phase closed loop and the continuous mineralization reaction.

[0022] S4: Open the electric gate valve at the discharge port of the mineralization reactor, the second belt weighing feeder, the second variable frequency motor and the second booster pump in sequence to transport the mineralized product and the flushing water to the slurry preparation tank for thorough mixing to prepare the slurry.

[0023] S5: Start the second slurry pump, open the electric gate valve of the mineralized product discharge port, and transport the slurry to the designated area through the pipeline, or implement grouting operations into the goaf.

[0024] Compared with the prior art, the system and application method of the present invention for enhancing the mineralization of carbon dioxide from alkaline solid waste using micro-nano bubbles has the following benefits:

[0025] 1) Micro-nano bubble technology significantly increases the gas-liquid interface area and improves the mass transfer rate by forming a large number of micron- and nano-sized bubbles. At the same time, nanobubbles have the characteristics of self-pressurization and collapse, and can exist stably in the liquid phase and continuously release carbon dioxide, greatly improving the dissolution efficiency and utilization rate of carbon dioxide.

[0026] 2) The micro-nano bubble generation unit used in the present invention integrates a dual-inlet Venturi tube structure, which can introduce carbon dioxide and auxiliary gas separately. By adjusting the flow ratio of each gas path to control the gas phase concentration and shear strength, the bubble size and distribution state are optimized, and the bubble stability and reaction adaptability are enhanced. The system is synchronously equipped with gas and liquid phase carbon dioxide concentration sensors, pH meters, laser particle size distribution and other monitoring elements. The physical properties of micro-nano bubble water can be collected in real time and fed back to the preparation module, ensuring that the bubble generation process is stable, adjustable and controllable, providing a continuous, homogeneous and efficient gas-liquid dispersion system for the subsequent alkaline solid waste mineralization reaction.

[0027] 3) The mineralization reaction module of the present invention adopts a transverse columnar structure design, which has the characteristics of large processing capacity and no need for stirring. The mineralization reaction module of the present invention adopts a transverse columnar structure to replace the traditional stirred reactor, and significantly enhances the mass transfer efficiency and carbonation reaction depth by extending the coexistence time and contact interface of the gas-liquid-solid three-phase in the reaction path. This structure can adapt to the feeding conditions of higher flow rates, maintain a fully mixed reaction without the need for mechanical stirring, reduce energy consumption and equipment complexity, and effectively improve the processing capacity per unit time. The water filtration system with a quartz sand filling section and a nylon screen structure at the bottom of the reactor flows into the circulating water unit, and cooperates with the pressure difference formed by the air compressor to realize the dynamic circulation elution of micro-nano bubble water, thereby reducing bubble loss and avoiding water resource waste. The module also integrates a variety of sensors such as temperature, pressure, and material level, which can collect, analyze and feedback key reaction parameters in real time, provide data support and automatic control basis for the reaction system, and ensure that the mineralization process is continuous, efficient and stable.

[0028] 4) The system has a compact structure, high reaction efficiency, low energy consumption, good scalability and on-site adaptability, and can be widely used in the fields of industrial solid waste resource utilization and carbon sequestration. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0030] Figure 1 This is a schematic structural diagram of a system for enhancing the mineralization of carbon dioxide from alkaline solid waste using micro-nano bubbles in Example 1 of the present invention;

[0031] Figure 2 Schematic diagram of the structure of the micro-nano bubble generation and injection unit in Example 1 of the present invention;

[0032] Figure 3 Schematic diagram of the structure of the mineralization reaction unit in Example 1 of the present invention;

[0033] Figure 4 Schematic diagram of the structure of the circulating water treatment unit in Example 1 of the present invention;

[0034] Figure 5 This is a schematic structural diagram of a mineralized product processing unit in Example 1 of the present invention;

[0035] Figure 6 Schematic diagram of the structure of the micro-nano bubble generating device in Example 1 of the present invention;

[0036] Figure 7 Schematic diagram of the structure of the upright columnar reactor in Example 2 of the present invention.

[0037] Description of main reference numerals:

[0038] 1-Micro-nano bubble generation and injection unit, 2-mineralization reaction unit, 3-circulating water treatment unit, 4-mineralization product treatment unit, 5-air pressure pump, 6-carbon dioxide gas supply pipeline, 7-air gas valve, 8-carbon dioxide gas valve, 9-air gas flow meter, 10-carbon dioxide gas flow meter, 11-micro-nano bubble generation device air inlet, 12-micro-nano bubble generation device, 13-micro-nano bubble generation device water inlet, 14-micro-nano bubble generation device water inlet valve, 15-laser particle size analyzer, 16-micro-nano bubble water transfer tank, 17-micro-nano bubble generation device outlet, 18-first liquid phase carbon dioxide concentration sensor, 19-first gas phase carbon dioxide concentration sensor, 20-pH online meter, 21-micro-nano bubble water transfer tank outlet valve, 22-first booster pump, 23-first liquid flow meter, 24-mineralization reactor water inlet gate, 25-mineralization reactor water inlet, 26-solid waste material bin, 27-first belt weighing feeder, 28-first frequency conversion motor, 29-mineralization reactor feed port, 30-mineralization reactor feed port electric gate valve, 31-motor, 32-reducer, 33-gas storage tank, 34-air Air compressor, 35-front sampling port, 36-middle sampling port, 37-screw feeding device, 38-temperature sensor, 39-ultrasonic level meter, 40-first pressure sensor, 41-quartz sand filling layer, 42-mineralization reactor, 43-nylon screen, 44-mineralization reactor water outlet, 45-mineralization reactor discharge port electric gate valve, 46-mineralization reactor discharge port, 47-second gas phase carbon dioxide concentration sensor, 48-second liquid phase carbon dioxide concentration sensor, 49-second pressure sensor, 50-water supply gate, 51-water supply pipeline, 52-circulation pump, 5 3-circulating water pool outlet gate, 54-circulating water pool, 55-second liquid flowmeter, 56-mineralized product silo, 57-second belt weighing feeder, 58-second variable frequency motor, 59-vibrating online viscometer, 60-first slurry pump, 61-slurry mixing water supply gate, 62-second booster pump, 63-jet nozzle, 64-slurry mixing pool, 65-electric gate valve for mineralized product discharge port, 66-second slurry pump, 67-screen water filter, 68-surfactant addition port, 69-gas-liquid mixing pump, 70-venturi tube, 71-dissolved air pressure tank, 72-micro-nano bubble nozzle. 73-filling port of upright column reactor, 74-micro-nano bubble water injection assembly of upright column reactor, 75-upright column reactor, 76-detachable flange, 77-reactor base, 78-water outlet of upright column reactor, 79-quartz sand filling section of upright column reactor, 80-nylon screen of upright column reactor. DETAILED DESCRIPTION

[0039] In order to enable those skilled in the art to better understand the technical solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of 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 making creative efforts should fall within the scope of protection of the present invention.

[0040] Example 1

[0041] like Figure 1-Figure 5 As shown, a system and application method for micro-nano bubble enhanced alkaline solid waste mineralization of carbon dioxide in one embodiment of the present invention, the system for micro-nano bubble enhanced alkaline solid waste mineralization of carbon dioxide, includes a micro-nano bubble generation and injection unit 1, a mineralization reaction unit 2, a circulating water treatment unit 3 and a mineralization product treatment unit 4, which can be applied to the micro-nano bubble mineralization carbon dioxide device for alkaline industrial solid waste. Through the innovative design of the device structure, the synergistic contact efficiency between the gas, liquid and solid phases is improved, and the depth and breadth of the application of micro-nano bubble technology in the field of carbon sequestration are expanded.

[0042] The micro-nano bubble generation and injection unit 1 includes a micro-nano bubble generation device 12, an air supply pipeline and a water supply pipeline. The air supply pipeline is used to adjust and monitor the gas flow.

[0043] The upper end face of the micro-nano bubble generating device 12 is provided with a micro-nano bubble generating device air inlet 11, and the water supply pipeline includes a micro-nano bubble generating device water inlet 13 and a micro-nano bubble generating device water inlet valve 14, and the micro-nano bubble generating device water inlet 13 is connected to the output end of the circulating water treatment unit 3.

[0044] The air supply pipeline includes an air valve 7, an air flow meter 9, a carbon dioxide valve 8 and a carbon dioxide flow meter 10. The air valve 7, the air flow meter 9, the carbon dioxide valve 8 and the carbon dioxide flow meter 10 are all connected to the air inlet 11 of the micro-nano bubble generating device. The air supply pipeline is connected to the air inlet 11 of the micro-nano bubble generating device at the upper part of the micro-nano bubble generating device 12. The water outlet 17 of the micro-nano bubble generating device is installed at the bottom of the micro-nano bubble generating device 12 and is connected to the micro-nano bubble water transfer tank 16. One end of the first booster pump 22 is connected to the micro-nano bubble water transfer tank 16, and the other end is connected to the top of the mineralization reaction unit 2; the water inlet 13 of the micro-nano bubble generating device installed in the middle of the micro-nano bubble generating device 12 is connected to the pipeline of the circulating water treatment unit 3.

[0045] Preferably, the flow range of the air supply pipeline is 0-2m 3 / h.

[0046] like Figures 1-6 As shown, the micro-nano bubble generating device 12 includes an outer shell, a venturi tube 70, a gas-liquid mixing pump 69, a dissolved air pressure tank 71 and a micro-nano bubble nozzle 72. The venturi tube 70 is provided inside the outer shell, the gas-liquid mixing pump 69 is connected to the upstream of the venturi tube 70, and the dissolved air pressure tank 71 is connected to the downstream of the venturi tube 70, so as to improve the uniformity of gas-liquid mixing and the efficiency of micro-nano bubble generation.

[0047] The outer shell is provided with at least one micro-nano bubble nozzle 72, located at the water outlet, for uniformly spraying the generated micro-nano bubble water into the micro-nano bubble water transfer tank 16. The water outlet 17 of the micro-nano bubble generating device is connected to the micro-nano bubble water transfer tank 16 for temporarily storing the generated micro-nano bubble water. The inner wall end surface of the micro-nano bubble water transfer tank 16 is provided with a first gas-phase carbon dioxide concentration sensor 19, a first liquid-phase carbon dioxide concentration sensor 18, and an online pH meter 20 for real-time monitoring of the composition and reaction environment of the bubble water. One end surface of the micro-nano bubble water transfer tank 16 is sequentially connected to a micro-nano bubble water transfer tank outlet valve 21 and a first booster pump 22. A first liquid flowmeter 23 is provided on one end surface of the first booster pump 22 for regulating and monitoring the delivery flow of the micro-nano bubble water.

[0048] Furthermore, the micro-nano bubble generator 12 is connected to the air gas pipeline and the carbon dioxide gas supply pipeline 6. The gas flow is regulated by an inlet valve and a flow meter before being introduced into the micro-nano bubble generator 12. The carbon dioxide gas supply pipeline 6 and the air gas pipeline are respectively connected to the micro-nano bubble generator inlet 11 of the micro-nano bubble generator 12, realizing a multi-source gas mixed supply.

[0049] The micro-nano bubble generation and injection unit 1 further includes a laser particle size analyzer 15 , which is disposed on the inner wall end face of the micro-nano bubble water transfer tank 16 and is used to monitor the micro-nano bubble particle size distribution in real time to optimize generation parameters and reaction efficiency.

[0050] The mineralization reaction unit 2 includes a mineralization reactor 42, the bottom of which is provided with a quartz sand filling layer 41 and a nylon screen 43 for achieving solid-liquid separation. The mineralization reaction unit 2 is connected to the micro-nano bubble generation and injection unit 1. The mineralization reactor 42 accurately controls the feeding amount through the first belt weighing feeder 27;

[0051] The mineralization reaction unit 2 also includes a mineralization reactor water inlet gate 24, a mineralization reactor feed inlet electric gate valve 30, a mineralization reactor discharge outlet electric gate valve 45, a solid waste material bin 26, a first belt weighing feeder 27 and a screw feeding device 37, a first variable frequency motor 28, an electric motor 31 and a reducer 32. The mineralization reactor 42 is equipped with a temperature sensor 38, a first pressure sensor 40 and an ultrasonic level meter 39 for monitoring the reaction temperature, pressure and filler height.

[0052] The top end surface of the mineralization reactor 42 is sequentially provided with a mineralization reactor water inlet 25 and a mineralization reactor feed inlet electric gate valve 30, and the top end surface of the mineralization reactor feed inlet electric gate valve 30 is provided with a mineralization reactor feed port 29. A first belt weighing feeder 27 is installed inside the mineralization reactor 42, and the mineralization reactor water inlet 25 is installed on the upper side of the first belt weighing feeder 27. The mineralization reactor feed port 29 is located on the upper side end surface of the first belt weighing feeder 27. The bottom end surface of the mineralization reactor 42 is sequentially provided with a front section sampling port 35, a middle section sampling port 36 and a mineralization reactor discharge port electric gate valve 45;

[0053] Specifically, the first gas phase carbon dioxide concentration sensor 19 and the mineralization reactor feed inlet electric gate valve 30 are installed on the right side of the mineralization reactor water inlet 25, the upper part of which is installed with a first belt weighing feeder 27, and the solid waste material bin 26 is installed above it. The first belt weighing feeder 27, the quartz sand filling layer 41 and the nylon screen 43 are installed inside the mineralization reactor 42, and the mineralization reactor outlet 44 is installed at the end of the column of the mineralization reactor 42 and connected to the circulating water treatment unit 3. The lower part of the column is equipped with a mineralization reactor discharge port electric gate valve 45 and a mineralization reactor discharge port 46 and is connected to the mineralization reaction unit 2. A mineralization reactor water inlet gate 24 is set between the mineralization reactor water inlet 25 and the first booster pump 22. The internal end surface of the mineralization reactor 42 is provided with a temperature sensor 38, a first pressure sensor 40 and an ultrasonic level meter 39 for monitoring. The lower part of the mineralization reactor 42 is provided with a front section sampling port 35 and a middle section sampling port 36 to facilitate sampling and analysis;

[0054] The first belt weigh feeder 27 is driven by a first variable-frequency motor 28, regulating and monitoring the addition rate of the alkaline solid waste. The mineralization reactor 42 is equipped with a screw feeder 37, comprising a motor 31 and a reducer 32. The motor 31 and reducer 32 control the screw feeder 37 to maintain reaction pressure and air quality, regulating the rate of the mineralization reaction. The system also features an air compressor 34 and an associated air tank 33, which assist in air intake and maintain pressure within the reactor. This compressor also serves to circulate water and filter out the waste.

[0055] The mineralization reactor water inlet 25, the mineralization reactor feed port 29 and the mineralization reactor discharge port 46 are respectively opened and closed by the mineralization reactor water inlet gate 24, the mineralization reactor feed port electric gate valve 30 and the mineralization reactor discharge port electric gate valve 45, and the water inlet is controlled by the mineralization reactor water inlet gate 24; the mineralization reactor feed port 29 controls the addition of solid waste through the mineralization reactor feed port electric gate valve 30, and the mineralization reactor discharge port 46 discharges the mineralized product through the mineralization reactor discharge port electric gate valve 45. The mineralization reactor water outlet 44 is connected to the circulating water treatment unit 3, and the air compressor 34 is connected to the air storage tank 33 to control the internal air pressure of the mineralization reactor 42, thereby playing a pressurization or filtration role to enhance the reaction rate.

[0056] The front sampling port 35 and the middle sampling port 36 are used for sampling and testing at different reaction stages. The temperature sensor 38 is used to detect the reaction temperature, the first pressure sensor 40 is used to monitor the internal pressure of the reactor, and the ultrasonic level meter 39 is used to monitor the solid waste filling level. The solid waste comes from the solid waste material bin 26 installed on the system.

[0057] Preferably, the feeding rate range of the first belt weighing feeder 27 is 0-5t / h, the working pressure range of the air compressor 34 is 0-30MPa, the gas mass flow range is 0-4kg / s, and the flow range of the water supply pipeline 51 is 0-60m 3 / h, and the feeding rate range of the second belt weighing feeder 57 is 0-5t / h.

[0058] The circulating water treatment unit 3 includes a circulating water pool 54, a circulating pump 52, a circulating water pool outlet gate 53 and a supplementary water pipeline 51. A pair of opposite end faces of the supplementary water pipeline 51 are respectively provided with a supplementary water gate 50 and a surfactant addition port 68. The circulating water pool 54 is filled with a surfactant, and the surfactant is added to enhance the number of micro-nano bubbles generated.

[0059] The inner wall end surfaces of the circulating water pool 54 are respectively provided with a second gas-phase carbon dioxide concentration sensor 47, a second liquid-phase carbon dioxide concentration sensor 48, and a second pressure sensor 49. One side end surface of the circulating water pool 54 is sequentially connected to a water replenishment gate 50, a water replenishment pipeline 51, and a surfactant addition port 68. The lower end surface of the circulating water pool 54 located below the water replenishment gate 50 is sequentially connected to a circulating water pool outlet gate 53, a circulating pump 52, a mesh water filter 67, and a second liquid flow meter 55. Specifically, the circulating water pool 54 is connected to the micro-nano bubble generation and injection unit 1 and the mineralization reaction unit 2 via the circulating pump 52. The outlet pipeline of the circulating water pool 54 is provided with a circulating water pool outlet gate 53, a second liquid flow meter 55, and a mesh water filter 67 for controlling, monitoring, and filtering out debris.

[0060] The circulating water tank 54 is used to store and recycle the water discharged from the mineralization reactor 42. The circulating pump 52 is connected between the circulating water tank 54 and the micro-nano bubble generator 12 and is used to pressurize and deliver the circulating water to the micro-nano bubble generation and injection unit 1. The circulating water tank outlet gate 53 controls the flow of circulating water from the circulating water tank 54 to the pump. The replenishing water pipeline 51 is used to replenish system water loss caused by evaporation or loss. Its inlet is equipped with a replenishing water gate 50 and a surfactant addition port 68 to enhance the amount of micro-nano bubbles generated.

[0061] Preferably, the system is equipped with several sensors and monitoring devices. The second gas-phase carbon dioxide concentration sensor 47 is used to monitor the carbon dioxide concentration in the gas section of the circulation system, the second liquid-phase carbon dioxide concentration sensor 48 is used to monitor the dissolved carbon dioxide concentration in the liquid phase, and the second pressure sensor 49 is used to detect changes in the gas-phase pressure in the circulating water pool; the second liquid flow meter 55 is used to detect changes in the water flow leaving the circulation system, thereby realizing closed-loop feedback of system control.

[0062] The circulating water treatment unit 3 also includes a mesh water filter 67, a second gas-phase carbon dioxide concentration sensor 47 and a second liquid flow meter 55. The mesh water filter 67 is used to filter particulate impurities in the water to prevent clogging of the micro-nano bubble generating device 12. The second gas-phase carbon dioxide concentration sensor 47, the second liquid-phase carbon dioxide concentration sensor 48, the second pressure sensor 49 and the second liquid flow meter 55 are used to comprehensively monitor the operating status of the water circulation system.

[0063] The mineralized product processing unit 4 includes a mineralized product silo 56, a second belt weighing feeder 57, a second variable frequency motor 58, a slurry mixing tank 64, a slurry mixing water supply gate 61, a first slurry pump 60, a second slurry pump 66, a second booster pump 62 and a jet nozzle 63. A vibration type online viscometer 59 is provided on one end face of the slurry mixing tank 64. The jet nozzle 63 is connected to the slurry mixing water supply pipeline and the second slurry pump 66. The jet nozzle 63 is arranged in the slurry mixing tank 64. The jet nozzle 63 is connected in sequence to the slurry mixing water supply pipeline. It is connected to a second booster pump 62 and a slurry water supply gate 61. A second belt weighing feeder 57 and a mineralized product silo 56 are provided on one end face of the slurry mixing pool 64. The discharge port 46 of the mineralization reactor is aligned with the mineralized product silo 56. The second belt weighing feeder 57 is connected to a second variable frequency motor 58. An electric gate valve 65 for the discharge port of the mineralized product and a second slurry pump 66 are provided on one end face of the slurry mixing pool 64. The first slurry pump 60 is located between the vibrating online viscometer 59 and the slurry mixing pool 64.

[0064] The mineralized product silo 56, the second belt weighing feeder 57, the second variable frequency motor 58 and the slurry preparation tank 64 are used for temporary storage, metering and slurry preparation of the mineralized products. The slurry preparation water supply gate 61, the first slurry pump 60, the second slurry pump 66, the second booster pump 62 and the jet nozzle 63 realize the efficient transportation and slurry mixing of the mineralized products. A second booster pump 62 and a jet nozzle 63 are provided on one end face of the slurry preparation tank 64 for slurry preparation; when the mineralized carbon dioxide product is blocked, pressurized flushing can also be performed. The mineralized product processing unit 4 includes a vibrating online viscometer 59 for real-time detection of the rheological properties of the mineralized slurry. The jet nozzle 63 is connected to the slurry preparation water supply pipeline, and the slurry preparation water is sprayed at high speed to mix the mineralized product with water to form a slurry, and cooperates with the second slurry pump 66 to form a circulating flow to achieve enhanced mixing of the slurry.

[0065] Specifically, the mineralized product silo 56 is installed above the second belt weigh feeder 57, and the slurry mixing tank 64 is installed below it. The mineralized product silo 56 is used to temporarily store the mineralized products discharged from the mineralization reactor 42; the second belt weigh feeder 57 is arranged below the silo to measure and transport the mineralized products; the second frequency conversion motor 58 drives the second belt weigh feeder 57, and the speed of the second belt weigh feeder 57 is controlled by the second frequency conversion motor 58 to adjust and monitor the addition rate of the mineralized products. The adjustable speed can achieve precise feeding control; the first slurry pump 60 pumps the initial mineralized product slurry to the slurry mixing tank 64; the slurry mixing water supply gate 61 controls the amount of added water to provide the required water source for the jet nozzle 63; the jet nozzle 63 is installed above the slurry mixing tank 64, and the second booster pump 62 upstream of its pipeline receives circulating water from the circulating water treatment unit 3, and the mineralized product discharge port electric gate valve 65 is installed at the bottom of the slurry mixing tank 64, and the discharge is controlled by the second slurry pump 66. The jet nozzle 63 is connected to the slurry mixing water supply system, and the slurry mixing water is injected into the mineralized product in the slurry mixing tank through the high-speed water jet action, thereby promoting the initial stirring and mixing of the slurry; the second slurry pump 66 is installed outside the slurry mixing tank 64 to form an internal circulation flow of the slurry, and cooperates with the jet stirring to further enhance the slurry mixing uniformity; the second booster pump 62 is used to transport the slurry to the subsequent processing or utilization system after it is evenly mixed; the electric gate valve 65 at the mineralized product discharge port controls the final slurry discharge process; the vibrating online viscometer 59 is set on the slurry mixing tank or its discharge pipe to monitor the rheological properties [such as viscosity] of the mineralized product in real time and provide feedback parameters for the system automatic control.

[0066] Taking the mineralization of carbon dioxide using high-calcium fly ash as an example, traditional carbon sequestration methods inject carbon dioxide into the reaction system at high pressure, requiring large-scale stirring equipment to promote mass transfer. However, due to the poor diffusibility of carbon dioxide, traditional methods have low utilization rates and poor stability of high-pressure systems. In contrast, this technology significantly increases the solubility of carbon dioxide by introducing micro- and nano-bubbles. According to Henry's law, the solubility of carbon dioxide in water at 25°C and 1 atm at room temperature and pressure is approximately 1.47 g / L. Under micro- and nano-bubble conditions, according to the Laplace pressure correction equation, bubbles 100 nm in size can increase the solubility of carbon dioxide to 17.86 g / L. By introducing carbon dioxide into high-calcium fly ash in the form of micro- and nano-bubbles, the diffusivity and solubility of carbon dioxide can be significantly enhanced at room temperature and pressure, significantly improving its utilization efficiency and promoting the efficient mineralization reaction.

[0067] An application method of a system for enhancing the mineralization of carbon dioxide from alkaline solid waste by micro-nano bubbles, comprising the following steps:

[0068] S1: Start the first belt weighing feeder 27 and the first variable frequency motor 28 to deliver the alkali solid waste to the feeding port 29 of the mineralization reactor;

[0069] S2: Start the motor 31, reducer 32 and the electric gate valve 30 at the inlet of the mineralization reactor, and fill the dry alkaline solid waste material into the mineralization silo through the spiral feeding device 37. According to the requirements of the reaction conditions, start the air compressor 34 to compact the solid waste material to form a dense solid reaction bed or provide the required pressure environment for the reaction process.

[0070] S3: Turn on the air pressure pump 5, the carbon dioxide supply pipeline 6, the water supply pipeline 51, the circulation pump 52 and the micro-nano bubble generating device 12 to prepare micro-nano bubble water. Turn on the first booster pump 22 and inject the micro-nano bubble water from the water inlet 25 of the mineralization reactor. The bubbles fully react with the alkaline solid waste during the process of passing through the solid waste filler layer. The reaction liquid overflows from the water outlet 44 of the mineralization reactor and passes through the mesh water filter 67 to remove particulate impurities. The reaction liquid then returns to the circulating water treatment unit 3, achieving a liquid phase closed loop and continuous mineralization reaction.

[0071] S4: The electric gate valve 45 at the discharge port of the mineralization reactor, the second belt weigh feeder 57, the second variable frequency motor 58, and the second booster pump 62 are sequentially opened to transport the mineralized product and flushing water to the slurry preparation tank 64 for thorough mixing to prepare a slurry. During the slurry preparation process, the first slurry pump 60 ensures the circulation of the slurry, while the jet nozzle 63 ensures thorough mixing of the slurry through high-speed jets.

[0072] S5: Start the second slurry pump 66, open the electric gate valve 65 at the mineralized product discharge port, and deliver the slurry to a designated area through pipelines, or perform grouting operations into the goaf. This completes the overall system startup, enabling continuous CO2 mineralization and engineering applications of high-flow alkaline solid waste slurry.

[0073] Example 2

[0074] Compared with the first embodiment, the present embodiment is different in that: for small batches of alkaline solid waste materials with high reaction activity, a micro-nano bubble mineralization system with a simplified structural layout is adopted to achieve equipment modularization and rapid deployment.

[0075] The system retains the core structure of the micro-nano bubble generation and injection unit 1, the circulating water treatment unit 3 and the mineralization reaction unit 2, eliminates the mineralization product processing unit 4, and is suitable for application scenarios in which the solid-liquid separation is followed by direct drying and utilization.

[0076] like Figure 7 As shown, the mineralization reactor 42 is a vertical columnar reactor 75, which includes a vertical columnar reactor micro-nano bubble water injection component 74. The vertical columnar reactor micro-nano bubble water injection component 74 is provided with a plurality of vertical columnar reactor filling ports 73, and the number of the vertical columnar reactor filling ports 73 is 3 to 5. The bottom of the vertical columnar reactor filling port 73 is sequentially provided with a detachable flange 76, a vertical columnar reactor quartz sand filling section 79, a vertical columnar reactor nylon screen 80, and a reactor base 77. The bottom of the reactor base 77 is provided with a vertical columnar reactor water outlet 78.

[0077] The vertical columnar reactor 75 is not provided with a spiral feeding device 37. Instead, a spray-type upper liquid inlet method is adopted. The bubble water passes through the solid waste filling layer from the top downward and flows out to the bottom filter layer by gravity.

[0078] A method for applying a system for enhancing the mineralization of carbon dioxide from alkaline solid waste using micro-nano bubbles, comprising the following steps:

[0079] S1: Remove the vertical column reactor micro-nano bubble water injection assembly 74 from the top of the vertical column reactor 75. Alkaline solid waste is loaded into the vertical column reactor 75 manually or using a small screw conveyor to form a quantitative reaction bed. The thickness of the reaction bed can be preset based on the reaction efficiency and treatment cycle requirements.

[0080] S2: After the filler is loaded, the vertical column reactor micro-nano bubble water injection assembly 74 is reinstalled, and the micro-nano bubble generating device 12 is started [refer to Example 1 for detailed steps] to prepare micro-nano bubble water containing carbon dioxide, and evenly spray it into the vertical column reactor 75 through multiple nozzles on the top;

[0081] Preferably, the number of water injection ports on the top of the vertical columnar reactor micro-nano bubble water injection assembly 74 is 3 to 5, which are evenly arranged along the top of the vertical columnar reactor 75 to improve the uniformity of gas-liquid distribution.

[0082] S3: The micro-nano bubble water passes through the packing layer under the action of gravity, achieving a full mineralization reaction with the alkaline solid waste. The infiltrated liquid is filtered and purified by the vertical column reactor quartz sand filling section 79 and the vertical column reactor nylon screen 80 at the bottom, then flows out through the outlet and into the circulating water tank 54.

[0083] Preferably, the quartz sand particle size is 0.1-1.2 mm, and the filling thickness is 100-1000 mm;

[0084] More preferably, a three-layer grading structure can be adopted: upper layer [coarse filter layer]: particle size 0.8~1.2mm, thickness 300~400mm; middle layer [transition layer]: particle size 0.5~0.8mm, thickness 200~300mm; lower layer [fine filter layer]: particle size 0.3~0.5mm, thickness 100~200mm.

[0085] Preferably, a nylon mesh or filter cloth with a pore size of 20-50 μm is placed beneath the quartz sand layer. For high-precision scenarios, a filter cloth with a pore size of 5-25 μm can be used. The pore size selection should take into account water quality conditions, system operating pressure, and operation and maintenance costs.

[0086] S4: After the reaction is completed, the bottom filter layer structure, namely the vertical column reactor quartz sand filling section 79 and the vertical column reactor nylon screen 80, is disassembled to discharge the mineralization reaction residue for the convenience of small-scale repeated operation.

[0087] The system is particularly suitable for mineralized carbon sequestration projects or laboratory exploratory experiments with small solid waste output, fast response, and the need for low-cost deployment.

[0088] Example 3

[0089] This embodiment targets industrial flue gas carbon capture scenarios. The front end of the system is connected to flue gas emission pipelines such as coal-fired boilers and lime kilns, and micro-nano bubbles are prepared using flue gas carbon dioxide as a gas source to achieve on-site conversion of source carbon.

[0090] In addition to retaining all the core units of Example 1, the system structure adds a flue gas pretreatment and cooling module, and a carbon dioxide separation / enrichment module [membrane separation or amine washing tower].

[0091] A method for applying a system for enhancing the mineralization of carbon dioxide from alkaline solid waste using micro-nano bubbles, comprising the following steps:

[0092] S1: After pretreatment, the flue gas enters the carbon dioxide enrichment system, outputting high-concentration carbon dioxide to the micro-nano bubble generation and injection unit;

[0093] S2: After the micro-nano bubble water is formed, it is injected into the mineralization reactor at a set flow rate to react with the continuously fed alkaline solid waste;

[0094] S3: The reaction liquid enters the water circulation system, and the mineralized products are discharged after stirring, slurried, and then injected into the mine or used for building material reuse;

[0095] The system can realize on-site conversion and storage of industrial source carbon. It is suitable for large-scale fixed emission sources such as thermal power plants, cement plants, and steel smelting. It has significant carbon emission reduction value and engineering application prospects.

[0096] The effects of this application are:

[0097] Beneficial effects

[0098] 1) Compared to traditional pressurized dissolution methods, micro-nanobubble carbon dioxide dissolution achieves high dissolution efficiency at room temperature and pressure, or even at moderate pressures. Pressurized dissolution relies on Henry's law, significantly increasing the solubility of carbon dioxide in liquids by increasing system pressure. However, its operation requires a sealed, pressure-resistant system, resulting in high equipment cost and energy consumption. Furthermore, once the pressure is reduced, the dissolved carbon dioxide tends to escape, limiting its utilization. Micro-nanobubble technology, on the other hand, significantly increases the gas-liquid interface area by forming a large number of micron- and nano-sized bubbles, enhancing mass transfer rates. Furthermore, nanobubbles exhibit self-pressurized collapse, allowing them to remain stable in the liquid phase and continuously release carbon dioxide, significantly improving both dissolution efficiency and utilization. According to Henry's law, the solubility of carbon dioxide in water at room temperature and pressure (25°C, 1 atm) is approximately 1.47 g / L. Under micro-nanobubble conditions, using the Laplace pressure correction, bubbles 100 nm in size can increase the solubility to 17.86 g / L. Under equivalent gas supply conditions, the micro-nano bubble method achieves superior CO2 dissolution rates and ultimate dissolution volume compared to pressurized dissolution. Furthermore, the system operates more safely and consumes less energy, making it suitable for green, low-carbon carbon capture and mineralization processes. Therefore, in mineralization processes that don't require high temperatures or high pressures, the micro-nano bubble method offers significant technical and application advantages.

[0099] 2) The micro-nano bubble generation unit used in the present invention integrates a dual-inlet Venturi tube structure, which can introduce carbon dioxide and auxiliary gas separately. By adjusting the flow ratio of each gas path to control the gas phase concentration and shear strength, the bubble size and distribution state are optimized, and the bubble stability and reaction adaptability are enhanced. The system is synchronously equipped with gas and liquid phase carbon dioxide concentration sensors, pH meters, laser particle size distribution and other monitoring elements. The physical properties of micro-nano bubble water can be collected in real time and fed back to the preparation module, ensuring that the bubble generation process is stable, adjustable and controllable, providing a continuous, homogeneous and efficient gas-liquid dispersion system for the subsequent alkaline solid waste mineralization reaction.

[0100] 3) The mineralization reaction module of the present invention adopts a transverse columnar structure design, which has the characteristics of large processing capacity and no need for stirring. The mineralization reaction module of the present invention adopts a transverse columnar structure to replace the traditional stirred reactor, and significantly enhances the mass transfer efficiency and carbonation reaction depth by extending the coexistence time and contact interface of the gas-liquid-solid three-phase in the reaction path. This structure can adapt to the feeding conditions of higher flow rates, maintain a fully mixed reaction without the need for mechanical stirring, reduce energy consumption and equipment complexity, and effectively improve the processing capacity per unit time. The water filtration system with a quartz sand filling section and a nylon screen structure at the bottom of the reactor flows into the circulating water unit, and cooperates with the pressure difference formed by the air compressor to realize the dynamic circulation elution of micro-nano bubble water, thereby reducing bubble loss and avoiding water resource waste. The module also integrates a variety of sensors such as temperature, pressure, and material level, which can collect, analyze and feedback key reaction parameters in real time, provide data support and automatic control basis for the reaction system, and ensure that the mineralization process is continuous, efficient and stable.

[0101] 4) The present invention proposes a new alkaline solid waste mineralization carbon dioxide system based on micro-nano bubble enhanced mass transfer. The system has a compact structure, high reaction efficiency, low energy consumption, good scalability and on-site adaptability, and can be widely used in the field of industrial solid waste resource utilization and carbon sequestration. Compared with traditional carbon sequestration or alkaline solid waste treatment technologies, this technology shows obvious advantages in terms of economy and environmental performance. Taking the common high-calcium fly ash as an example, the traditional carbon sequestration method has a low carbon dioxide utilization rate and poor system stability. This technology improves the contact efficiency of carbon dioxide and slurry interface by introducing micro-nano bubbles, which can achieve rapid completion of carbonation reaction. At the same time, the system shows significant comprehensive benefits in the coordinated application with alkaline solid waste treatment in mining areas.

[0102] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be included therein. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

[0103] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A system for enhancing the mineralization of carbon dioxide from alkaline solid waste using micro-nano bubbles, characterized in that: Including; The micro-nano bubble generation and injection unit includes a micro-nano bubble generation device, an air supply pipeline, and a water supply pipeline; The mineralization reaction unit includes a mineralization reactor, a quartz sand filling layer and a nylon screen are provided at the bottom of the reactor, and the mineralization reaction unit is connected to the micro-nano bubble generation and injection unit; The circulating water treatment unit includes a circulating water pool, a circulating pump, a circulating water pool outlet gate and a water supply pipeline. A pair of opposite end faces of the water supply pipeline are respectively provided with a water supply gate and a surfactant addition port. The circulating water pool is filled with a surfactant.

2. The system for enhancing alkaline solid waste mineralization of carbon dioxide using micro-nano bubbles according to claim 1, characterized in that: The upper end face of the micro-nano bubble generating device is provided with an air inlet of the micro-nano bubble generating device, the water supply pipeline includes a water inlet of the micro-nano bubble generating device and a water inlet valve of the micro-nano bubble generating device, the water inlet of the micro-nano bubble generating device is connected to the output end of the circulating water treatment unit, the air supply pipeline includes an air valve, an air flow meter, a carbon dioxide valve and a carbon dioxide flow meter, and the air valve, air flow meter, carbon dioxide valve and carbon dioxide flow meter are all connected to the air inlet of the micro-nano bubble generating device.

3. The system for enhancing alkaline solid waste mineralization of carbon dioxide using micro-nano bubbles according to claim 2, characterized in that: The micro-nano bubble generating device is connected to the air gas pipeline and the carbon dioxide gas supply pipeline, and the gas flow is respectively regulated by the air inlet valve and the flow meter before being introduced into the micro-nano bubble generating device; The micro-nano bubble generating device includes an outer shell, a venturi tube, a gas-liquid mixing pump, a dissolved air pressure tank, and a micro-nano bubble nozzle. The outer shell is provided with a venturi tube, the gas-liquid mixing pump is connected to the upstream of the venturi tube, and the dissolved air pressure tank is connected to the downstream of the venturi tube. The outer shell is provided with at least one micro-nano bubble nozzle. The water outlet of the micro-nano bubble generating device is connected to a micro-nano bubble water transfer tank. The inner wall end surface of the micro-nano bubble water transfer tank is provided with a first liquid phase carbon dioxide concentration sensor, a first gas phase carbon dioxide concentration sensor, and a pH online meter. One side end surface of the micro-nano bubble water transfer tank is sequentially connected to a micro-nano bubble water transfer tank outlet valve and a first booster pump. One side end surface of the first booster pump is provided with a first liquid flow meter.

4. The system for enhancing alkaline solid waste mineralization of carbon dioxide using micro-nano bubbles according to claim 1 or 3, characterized in that: The micro-nano bubble generation and injection unit also includes a laser particle size analyzer, which is arranged on the inner wall end face of the micro-nano bubble water transfer tank. The mineralization reaction unit also includes a mineralization reactor water inlet gate, a mineralization reactor feed inlet electric gate valve, a mineralization reactor discharge outlet electric gate valve, a solid waste material bin, a first belt weighing feeder, a screw feeding device, a first variable frequency motor, an electric motor and a reducer.

5. The system for enhancing alkaline solid waste mineralization of carbon dioxide using micro-nano bubbles according to claim 1, characterized in that: The micro-nano bubble enhanced alkaline solid waste mineralization carbon dioxide system also includes a flue gas pretreatment and cooling module and a carbon dioxide separation module.

6. The system for enhancing alkaline solid waste mineralization of carbon dioxide using micro-nano bubbles according to claim 1 or 5, characterized in that: The top end face of the mineralization reactor is sequentially provided with a mineralization reactor water inlet and a mineralization reactor feed inlet electric gate valve, the top end face of the mineralization reactor feed inlet electric gate valve is provided with a mineralization reactor feeding port, one side end face of the mineralization reactor is provided with a first belt weighing feeder, the upper end face of the first belt weighing feeder is provided with a solid waste material bin, the mineralization reactor feeding port is located at the upper end face of the first belt weighing feeder, the bottom end face of the mineralization reactor is sequentially provided with a front section sampling port, a middle section sampling port and a mineralization reactor discharge port electric gate valve, the bottom end face of the mineralization reactor discharge port electric gate valve is provided with a mineralization reactor discharge port, a mineralization reactor water inlet gate is provided between the mineralization reactor water inlet and the first booster pump, the internal end face of the mineralization reactor is provided with a temperature sensor, a first pressure sensor and an ultrasonic level meter, the first belt weighing feeder is driven by a first variable frequency motor, and the spiral feeding device is driven by an electric motor and a reducer.

7. The system for enhancing alkaline solid waste mineralization of carbon dioxide using micro-nano bubbles according to claim 6, characterized in that: The circulating water treatment unit also includes a mesh water filter, a second gaseous carbon dioxide concentration sensor and a second liquid flow meter. The inner wall end faces of the circulating water pool are respectively provided with a second gaseous carbon dioxide concentration sensor, a second liquid carbon dioxide concentration sensor and a second pressure sensor. One side end face of the circulating water pool is respectively connected to the water supply gate, the water supply pipeline and the surfactant addition port in sequence. The lower side end face of the circulating water pool located at the water supply gate is respectively connected to the circulating water pool outlet gate, the circulation pump, the mesh water filter and the second liquid flow meter in sequence.

8. The system for enhancing alkaline solid waste mineralization of carbon dioxide using micro-nano bubbles according to claim 7, characterized in that: The mineralized product processing unit includes a mineralized product silo, a second belt weighing feeder, a second frequency conversion motor, a slurry mixing tank, a slurry mixing water supply gate, a first slurry pump, a second slurry pump, a second booster pump and a jet nozzle. A vibrating online viscometer is provided on one end face of the slurry mixing tank. The jet nozzle is connected to the slurry mixing water supply pipeline and the second slurry pump. The jet nozzle is arranged in the slurry mixing tank. The jet nozzle is connected to the second booster pump and the slurry mixing water supply gate in sequence. A second belt weighing feeder and a mineralized product silo are provided on one end face of the slurry mixing tank. The discharge port of the mineralization reactor is aligned with the mineralized product silo. The second belt weighing feeder is connected to the second frequency conversion motor. An electric gate valve for the discharge port of the mineralized product and a second slurry pump are respectively provided on one end face of the slurry mixing tank. The first slurry pump is located between the vibrating online viscometer and the slurry mixing tank.

9. The system for enhancing alkaline solid waste mineralization of carbon dioxide using micro-nano bubbles according to claim 1 or 8, characterized in that: The mineralization reactor is a vertical columnar reactor, which includes a vertical columnar reactor micro-nano bubble water injection component. The vertical columnar reactor micro-nano bubble water injection component is provided with multiple vertical columnar reactor filling ports, and the number of the vertical columnar reactor filling ports is 3 to 5. The bottom of the vertical columnar reactor filling port is sequentially provided with a detachable flange, a vertical columnar reactor quartz sand filling section, a vertical columnar reactor nylon screen, and a reactor base. The bottom of the reactor base is provided with a vertical columnar reactor water outlet. The quartz sand particle size of the vertical columnar reactor quartz sand filling section is 0.1-1.2 mm, and the filling thickness is 100-1000 mm.

10. An application method of a system for enhancing the mineralization of carbon dioxide from alkaline solid waste using micro-nano bubbles, applied to the system for enhancing the mineralization of carbon dioxide from alkaline solid waste using micro-nano bubbles according to any one of claims 1 to 9, characterized in that: The method includes the following steps: S1: Start the first belt weighing feeder and the first variable frequency motor to deliver the alkali solid waste to the feeding port of the mineralization reactor; S2: Start the motor, reducer and electric gate valve at the inlet of the mineralization reactor, and fill the dry alkaline solid waste material into the mineralization silo through the spiral feeding device. According to the requirements of the reaction conditions, start the air compressor to compact the solid waste material to form a dense solid reaction bed or provide the required pressure environment for the reaction process; S3: Turn on the air pressure pump, carbon dioxide gas supply pipeline, water supply pipeline, circulation pump and micro-nano bubble generating device to prepare micro-nano bubble water. Turn on the first booster pump and inject the micro-nano bubble water from the water inlet of the mineralization reactor. The bubbles fully react with the alkaline solid waste during the process of passing through the solid waste filler layer. The reaction liquid overflows from the water outlet of the mineralization reactor and passes through the screen water filter to remove particulate impurities. It then returns to the circulating water treatment unit, realizing the liquid phase closed loop and the continuous mineralization reaction. S4: Open the electric gate valve at the discharge port of the mineralization reactor, the second belt weighing feeder, the second variable frequency motor and the second booster pump in sequence to transport the mineralized product and the flushing water to the slurry preparation tank for thorough mixing to prepare the slurry; S5: Start the second slurry pump, open the electric gate valve of the mineralized product discharge port, and transport the slurry to the designated area through the pipeline, or implement grouting operations into the goaf.

Images