Carbon capture system for industrial flue gas

Abstract

The invention discloses a carbon capture system for industrial flue gas, and relates to the field of carbon capture. The system comprises a mixing device for mixing steel slag micro-powder and a catalyst, a feeding device for feeding the steel slag micro-powder into the mixing device, a reactor connected with the mixing device, a gas inlet assembly for feeding flue gas with carbon dioxide into the reactor, and a collecting device connected with the reactor and used for collecting dust. According to the system, the power consumption in the carbon dioxide capturing process is greatly reduced, the economical efficiency of the whole process is improved, and the technology has the potential of popularization and application.

Description

Technical Field

[0001] The present application relates to the field of carbon capture, and in particular to a carbon capture system for industrial flue gas. Background Art

[0002] In the existing technology, the carbon dioxide capture system has made certain progress in the industrial emission reduction process. For example, in the existing technology such as the single-chamber flat fluidized bed reactor, the micro-powder is fluidized by a blower so that it is fully in contact with the high-temperature industrial flue gas, thereby using the steel slag micro-powder to capture carbon dioxide from the industrial flue gas. This method can not only reduce carbon dioxide emissions, but also convert industrial solid waste steel slag into valuable cement additives. Under the action of the catalyst, oxides such as calcium oxide in the micro-powder react with carbon dioxide in the flue gas to form stable carbonates, capture a large amount of carbon dioxide, and realize the resource utilization of steel slag, replacing the use of part of cement clinker.

[0003] However, although the existing technology has achieved certain results in carbon dioxide capture and resource utilization, it still has several serious deficiencies in practical application. First, the overall energy consumption of the existing carbon dioxide capture system is extremely high. The system requires continuous air supply through a blower to maintain the fluidized state of the micropowder, and the overall mixing efficiency is low. The high energy consumption greatly reduces the economic efficiency of the entire carbon dioxide capture process, making it difficult to promote and apply on a large scale.

[0004] Specifically, the overall design of the existing carbon capture system has many defects, resulting in unsatisfactory fluidization efficiency and reaction effect. Specifically, in the fluidization link of the system, the airflow distribution is uneven, which makes it difficult for the micropowder to fully contact with the high-temperature flue gas during the fluidization process, resulting in incomplete reaction, requiring longer reaction time and higher energy consumption. In the carbon capture step, the micropowder is prone to leakage, and the micropowder is easy to overflow the system during the reaction, resulting in material waste and equipment wear. This not only increases the operating and maintenance costs, but also has a negative impact on the capture efficiency, further reducing the economic efficiency of the process.

[0005] For example, in patent CN117510106B, a steel slag carbon capture resource processing device is proposed, which realizes efficient steel slag carbon capture processing through the organic combination of a feeding mechanism, an activation modification mechanism and a carbon fixation reaction mechanism. The device includes a feeding mechanism for lifting and conveying steel slag powder; an activation modification mechanism for surface activation and active component loading of steel slag; and a carbon fixation reaction mechanism for causing the activated steel slag powder to undergo a carbon fixation reaction. The carbon fixation reaction mechanism includes a reactor with a vibrating hammer on the outer wall, the reactor is provided with a discharge port and a recovery port, and flue gas containing carbon dioxide is introduced through a first air duct and a second air duct to cause the steel slag powder to undergo a carbon fixation reaction. Although the device has improved the process flow to a certain extent, it still has problems of high energy consumption and low efficiency in the fluidization and carbon capture steps.

[0006] Specifically, in actual application, although the device in patent CN117510106B has improved some process flows, its fluidization efficiency and reaction effect have not yet reached the ideal state. The device still has the problem of high energy consumption during the fluidization process, and uneven fluidization of micropowders may occur during the reaction process, affecting the overall efficiency of carbon dioxide capture. In addition, the structure of the device is complex and the maintenance cost is high. The equipment is prone to wear and blockage during long-term operation, resulting in increased operating costs. These problems make the existing patented technology still face challenges in large-scale industrial applications.

[0007] In response to these problems, the development of new carbon capture systems for industrial flue gas is of great significance and value. Summary of the invention

[0008] The purpose of this application is to overcome at least one of the shortcomings of the prior art and to provide a carbon capture system for industrial flue gas, which greatly reduces the power consumption in the carbon dioxide capture process, improves the economy of the overall process, and makes this technology more potential for promotion and application.

[0009] To achieve the above-mentioned purpose, the present application discloses a carbon capture system for industrial flue gas, which includes a mixing device for mixing steel slag powder with a catalyst, a feeding device for feeding the steel slag powder into the mixing device, a reactor connected to the mixing device, an air intake assembly for feeding flue gas with carbon dioxide into the reactor, and a collection device connected to the reactor and used for dust collection, wherein:

[0010] The feeding device comprises a raw material bin, an intermediate bin connected to the raw material bin, and a vibration filter assembly installed at the discharge port of the intermediate bin, and the vibration filter assembly feeds the filtered steel slag powder into the mixing device;

[0011] The mixing device comprises a mixer and a spray assembly inserted into the mixer for spraying the catalyst. The mixer and the spray assembly mix the steel slag powder and the catalyst into a mixed powder and then send the mixed powder into the reactor;

[0012] The reactor comprises a cylindrical body, a bed plate that divides the internal space of the body into an air inlet chamber at the top and a working chamber at the bottom, a plurality of air inlet cones evenly arranged on the bed plate, a stirring mechanism arranged in the working chamber and cooperating with the bed plate, a spraying mechanism located above the bed plate and used for spraying the catalyst, and at least one sound wave generator located in the working chamber;

[0013] The main body is provided with an air inlet connected to the air inlet chamber, the air inlet is connected to the air inlet assembly through a pipeline, and the air inlet assembly delivers smoke into the air inlet chamber; the air inlet cone is connected to the air inlet chamber and is used to guide the smoke in the air inlet chamber toward the bed plate for ejection;

[0014] The working room is provided with a feed port connected to the mixing device, and the mixed powder is delivered to the bed plate from the feed port;

[0015] The spray mechanism comprises a plurality of spray rods and self-spinning nozzles arranged on the spray rods;

[0016] The working room is provided with an exhaust port, which is connected to the collecting device through a pipeline, and the exhaust port sends the dust-carrying mixed gas after the reaction into the collecting device;

[0017] The collecting device comprises a cyclone dust collector and a bag dust collector connected to the air outlet of the cyclone dust collector.

[0018] In some embodiments, the vibration filter assembly feeds 200-300 mesh slag powder into the feeding assembly, and the vibration filter assembly has at least one mesh plate with 200-300 mesh openings and a driving unit for driving the mesh plate to vibrate at high frequency.

[0019] In some embodiments, the mixer in the mixing device is a double-shaft mixer.

[0020] In some embodiments, the upper surface of the bed board is wavy and undulating.

[0021] In some embodiments, the air intake cone has a vertical main air channel and a plurality of branch channels connected to the main air channel and inclined at 45 degrees toward the bed plate; the branch channels are Laval channels.

[0022] In some embodiments, the sound wave generator is an ultrasonic generator with a sound frequency of 20kHz-40kHz.

[0023] In some embodiments, the self-spinning nozzle includes a base connected to the spray rod, and a nozzle head rotatably mounted on the base and connected to the base. When the nozzle head is working, the spray pressure is used to achieve self-spin based on the base.

[0024] In some embodiments, the stirring mechanism includes at least one horizontally rotating rotating rod and a stirring plate installed on the rotating rod close to the bed plate, and the stirring plate has a comb-tooth structure to avoid the air intake cone.

[0025] Furthermore, the stirring mechanism also includes a stirring member with a brush.

[0026] In some embodiments, a booster pump is installed at the air inlet of the main body, and the booster pump is started according to work needs to increase the input air pressure of the smoke entering the air inlet chamber.

[0027] In some embodiments, the body has an outer temperature layer to reduce heat loss from the body and increase reaction temperature and efficiency.

[0028] Compared with the prior art, the present invention has at least one of the following beneficial effects:

[0029] 1. Reduce energy consumption: This application significantly reduces the power consumption in the carbon dioxide capture process by improving the mixing device and reactor structure, and improves the economic efficiency of the overall process. By using a vibration filter component and a spray component, the fluidization efficiency of the steel slag powder and the contact reaction efficiency with the flue gas are improved, thereby reducing the operating energy consumption of the system.

[0030] 2. Improve capture efficiency: This application uses devices such as wavy concave-convex bed plates, sonic generators, and spin nozzles to enhance the mixing effect of steel slag powder and high-temperature flue gas, greatly improving the carbon dioxide capture efficiency. The optimized fluidization process and reaction structure ensure that the steel slag powder is evenly distributed and fully reacted in the reactor, thereby improving the carbon dioxide capture rate.

[0031] 3. Improve capture rate: This application designs an effective dust collection system, including a cyclone dust collector and a bag dust collector, which can efficiently recover the micro powder after the reaction, thereby improving the stability of the system and the utilization rate of materials.

[0032] 4. Simplified structure and reduced maintenance cost: This application simplifies the overall design of the system by rationally designing the structure of each component, making the equipment structure more compact and reducing the complexity and maintenance cost of the equipment. This not only reduces the failure rate during operation, but also improves the reliability and economy of the system, making it more suitable for large-scale industrial applications.

[0033] The above-listed beneficial effects are not exhaustive of all advantages. Other potential beneficial effects and detailed technical implementations will be further disclosed in the examples or other description parts of this application. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] After reading the following detailed description in conjunction with the accompanying drawings, you will have a better understanding of various aspects of the present disclosure. The positions, sizes, and ranges of various structures shown in the accompanying drawings sometimes do not represent the actual positions, sizes, and ranges. In the accompanying drawings:

[0035] Figure 1 It is a system structure block diagram of an embodiment disclosed in this application.

[0036] Figure 2 It is a schematic diagram of the system structure in an embodiment disclosed in this application.

[0037] Figure 3 It is a workflow diagram of an embodiment disclosed in this application.

[0038] Figure 4 It is a schematic diagram of the internal structure of a reactor in an embodiment disclosed in the present application.

[0039] Figure 5 It is a structural schematic diagram of a bed board in an embodiment disclosed in the present application.

[0040] Figure 6 It is a schematic diagram of the internal structure of the air intake cone in an embodiment disclosed in the present application. DETAILED DESCRIPTION

[0041] The present disclosure will be described below with reference to the accompanying drawings, wherein the accompanying drawings illustrate several embodiments of the present disclosure. However, it should be understood that the present disclosure can be presented in a variety of different ways and is not limited to the embodiments described below; in fact, the embodiments described below are intended to make the disclosure of the present disclosure more complete and fully illustrate the scope of protection of the present disclosure to those skilled in the art. It should also be understood that the embodiments disclosed herein can be combined in various ways to provide more additional embodiments.

[0042] It should be understood that the same reference numerals represent the same elements throughout the drawings. In the drawings, the dimensions of certain features may be distorted for clarity.

[0043] It should be understood that the words used in the specification are only used to describe specific embodiments and are not intended to limit the present disclosure. All terms (including technical terms and scientific terms) used in the specification have the meanings commonly understood by those skilled in the art unless otherwise defined. For the sake of brevity and / or clarity, the techniques, methods and equipment known to ordinary technicians in the relevant field may not be discussed in detail, but where appropriate, the techniques, methods and equipment should be considered as part of the authorized specification.

[0044] The singular forms "a", "said" and "the" used in the specification include plural forms unless clearly indicated. The words "include", "comprise" and "contain" used in the specification indicate the presence of the claimed features, but do not exclude the presence of one or more other features. The word "and / or" used in the specification includes any and all combinations of one or more of the relevant listed items.

[0045] Example:

[0046] like Figures 1 to 6 As shown, this embodiment provides an exemplary structure of a carbon capture system for industrial flue gas, which includes the following main components: a feeding device 1, a mixing device 2, a reactor 3, an air intake assembly 4 and a collecting device 5. The structures of the components and their mutual coordination are as follows:

[0047] Feeding device 1: This device is responsible for uniformly conveying the steel slag powder to the mixing device 2. It is mainly composed of a raw material bin 101, an intermediate bin 102 and a vibration filter assembly. The raw material bin 101 stores the steel slag powder, which is received and conveyed to the intermediate bin 102. The intermediate bin 102 filters the powder through the vibration filter assembly and then conveys it to the mixing device 2. The vibration filter assembly ensures that the particle size of the steel slag powder is uniform, providing stable raw materials for the subsequent mixing process.

[0048] Mixing device 2: This device is used to evenly mix the steel slag powder and the catalyst. It mainly includes a double-shaft mixer and a spray assembly. The steel slag powder is fed into the double-shaft mixer through the feeding device 1, and the spray assembly sprays the catalyst into the mixer in an atomized form. The double-shaft mixer fully mixes the steel slag powder and the catalyst through the rotation of the stirring shaft to form a uniform mixed powder.

[0049] Reactor 3: The reactor 3 is used to achieve the reaction between steel slag powder and carbon dioxide. The reactor 3 mainly includes a cylindrical body 201, a bed plate 202, an air inlet cone 206, a stirring mechanism 208, a spray mechanism 205 and a sound wave generator 207. The mixed powder is fed into the reactor 3 through the mixing device 2, the bed plate 202 divides the body 201 into an air inlet chamber 203 and a working room 204, and the air inlet cone 206 sprays the flue gas evenly into the working room 204. The stirring mechanism 208 stirs the mixed powder evenly, the spray mechanism 205 sprays the catalyst, and the sound wave generator 207 improves the reaction efficiency.

[0050] Intake assembly 4: This assembly is responsible for delivering flue gas with carbon dioxide to the reactor 3. It mainly includes a flue gas collector and a booster pump. After the flue gas is collected by the flue gas collector, the gas pressure is increased by the booster pump to ensure that the flue gas can evenly enter the intake chamber 203 of the reactor, and evenly spray onto the bed plate 202 through the intake cone 206 to fully react with the mixed powder.

[0051] Collection device 5: This device is used to collect dust generated after the reaction and purify the exhaust gas. It mainly includes a cyclone dust collector and a bag dust collector. The dusty mixed gas after the reaction enters the cyclone dust collector through the exhaust port, and the rotating airflow is used to separate the dust and preliminarily purify the gas. The purified gas then enters the bag dust collector to further filter the residual dust to ensure that the exhausted gas meets environmental protection standards.

[0052] Through the close cooperation of the above components, this system realizes the whole process from mixing of steel slag powder and catalyst, uniform transportation of flue gas to dust collection and gas purification after reaction.

[0053] As a more detailed description of this embodiment, in this embodiment, the feeding device 1 is used to uniformly transport the steel slag powder to the mixing device 2.

[0054] Specifically, the raw material bin 101 of the feeding device 1 is used to store a large amount of steel slag powder, which is usually a large storage bin capable of accommodating several tons of steel slag powder to ensure long-term continuous feeding. The raw material bin 101 transports the steel slag powder to the intermediate bin 102 through an automatic feeding system.

[0055] More specifically, the outlet of the raw material bin 101 is provided with an automatic control valve, and the steel slag powder is accurately transported to the intermediate bin 102 through gravity and the automatic control flap valve. The intermediate bin 102 serves as a temporary storage space for the steel slag powder, and a vibration filter assembly is provided at the outlet at the bottom thereof.

[0056] The middle bin 102 is designed with a conical bottom to ensure that the micro powder can flow smoothly to the vibration filter assembly.

[0057] The vibration filtering assembly is installed at the discharge port of the intermediate bin 102, and is mainly composed of a mesh plate and a driving unit in terms of structural composition.

[0058] Specifically, the mesh plate has an aperture of 200-300 meshes and is made of high-strength stainless steel material, which can effectively filter out larger particles of micro-powder and only allow micro-powder with uniform particle size to pass through.

[0059] The driving unit includes a motor and an eccentric wheel mechanism, which allows the micro powder to pass through the screen plate through high-frequency vibration to ensure that the micro powder particle size is uniform. The filtered micro powder enters the mixing device 2 uniformly through the outlet.

[0060] During the operation of the feeding device 1 , firstly, the steel slag powder is stored in the raw material bin 101 via external conveying equipment or manual transportation.

[0061] It should be understood that the capacity design of the raw material bin 101 can meet the continuous production requirements for at least 24 hours. Then, the steel slag powder in the raw material bin 101 flows into the raw material bin 101 by gravity. An automatically controlled flap valve is provided in the raw material bin 101 to control the flow of the powder and ensure stable feeding. Then, the steel slag powder enters the intermediate bin 102 from the raw material bin 101, and the intermediate bin 102 serves as a temporary storage space to ensure that the powder is evenly transported to the vibration filter assembly.

[0062] When the powder enters the intermediate bin 102, the vibration filter assembly starts. The motor drives the screen plate to vibrate at high frequency through the eccentric wheel mechanism, so that the powder passes through the 200-300 mesh screen plate. The high-frequency vibration allows the steel slag powder to be filtered through the screen plate, and the filtered fine powder is evenly fed into the mixing device 2. This process ensures that the particle size of the steel slag powder entering the mixer is uniform, which improves the subsequent mixing and reaction efficiency.

[0063] It should be understood that in actual application in steel plants, the feeding device 1 needs to process several tons of steel slag powder every day. The operator fills the steel slag powder into the raw material bin 101 through a conveying device or manually. After starting the feeding device 1, the steel slag powder in the raw material bin 101 flows into the intermediate bin 102 by gravity. The vibration filter assembly is started, and the high-frequency vibration filters out the steel slag powder of 200-300 mesh, and the larger particles are blocked on the mesh plate. The filtered uniform powder is sent to the mixing device 2 through the conveying system for subsequent mixing and reaction.

[0064] As a more detailed description of this embodiment, in the industrial flue gas carbon capture system provided in this embodiment, the mixing device 2 is a key part to ensure that the steel slag powder and the catalyst are fully mixed.

[0065] In terms of structural composition, the mixing device 2 is mainly composed of a twin-shaft mixer and a spray assembly (located inside the twin-shaft mixer, not shown in the figure). Its design and working process ensure the uniformity of the mixed powder and provide good conditions for subsequent reactions.

[0066] Specifically, the double-shaft mixer in the mixing device 2 has two parallel stirring shafts, each of which is equipped with a plurality of propeller blades. The stirring shafts rotate in opposite directions, and the steel slag powder and the catalyst are fully mixed by the rotational motion. The stirring shafts are made of high-strength alloy steel, are wear-resistant and corrosion-resistant, and can operate stably for a long time.

[0067] The spray assembly includes a number of spray rods inserted into the twin-shaft mixer and a self-spinning nozzle arranged on the spray rod. The spray rod is connected to the external catalyst storage tank through a pipeline, and the catalyst is kept at a certain pressure in the storage tank. The self-spinning nozzle is installed on the spray rod, and the nozzle head can rotate freely and is connected to the spray rod. The self-spinning nozzle realizes the self-spinning of the spray rod through the injection pressure, ensuring that the catalyst is evenly sprayed on the steel slag powder in the form of atomization.

[0068] The spray assembly 205 sprays the fixed amount of catalyst evenly on the steel slag powder to ensure that the catalyst can fully contact with the steel slag powder and promote the subsequent reaction.

[0069] It should be noted that during the working process of this embodiment, the catalyst is sprayed twice. The first spraying is in the mixing device 2 to ensure that the steel slag powder and the catalyst are initially mixed. The second spraying is in the reactor 3, and the catalyst is further sprayed through the spraying mechanism 205 to enhance the reaction effect.

[0070] The working process of the mixing device 2 is as follows: First, the filtered steel slag powder passes into the double-shaft mixer. The stirring shaft starts to rotate, and the propeller blades evenly distribute the steel slag powder along the axial direction of the mixer. At the same time, the spray assembly is started, and the catalyst enters the self-spinning nozzle through the spray rod under pressure, and the self-spinning nozzle sprays the catalyst evenly on the steel slag powder through the rotational motion. The rotational motion of the propeller blades fully mixes the steel slag powder and the catalyst to form a uniform mixed powder. The mixed powder is transported to the reactor 3 through the discharge port of the mixer.

[0071] In actual usage scenarios, the design and working process of the mixing device 2 ensures sufficient mixing of the steel slag powder and the catalyst.

[0072] As a more detailed description of this embodiment, the reactor 3 is responsible for achieving the reaction between the steel slag powder and carbon dioxide to generate carbon capture products.

[0073] The structural composition, working principle and working steps of the reactor 3 are described in detail below.

[0074] Specifically, the main structure of the reactor 3 includes a cylindrical body 201 , a bed plate 202 , an air inlet cone 206 , a stirring mechanism 208 , a spraying mechanism 205 and a sound wave generator 207 .

[0075] In the above structure, the interior of the main body 201 is divided into an air inlet chamber 203 at the bottom and a working chamber 204 at the top by a bed plate 202 .

[0076] The upper surface of the bed plate 202 is designed to have a wavy convex-concave structure, which cooperates with the air inlet cone 206 so that the smoke airflow obliquely discharged from the air inlet cone 206 interacts with each other, forming a vortex on the bed plate 202, thereby making it easier for the mixed powder on the bed plate 202 to form a fluidized state.

[0077] More specifically, the air intake cone 206 is installed on the bed plate 202 to evenly distribute the smoke from the air intake chamber 203 to the working chamber 204 .

[0078] The air inlet cone 206 is connected to the air inlet chamber 203 through a vertical main air passage 211. The smoke enters the air inlet cone 206 through the main air passage 211 under pressure, and then is uniformly sprayed onto the bed plate 202 through a plurality of 45-degree inclined branch air passages 212. Due to the wavy structure of the bed plate 202, the obliquely discharged smoke airflow forms a swirl on the bed plate 202, increasing the contact area and contact time between the airflow and the powder, thereby effectively fluidizing the powder.

[0079] In the above structure, the branch airway 212 in the air inlet cone 206 adopts a Laval airway structure, which can effectively improve the speed and uniformity of the airflow. The Laval airway consists of a contraction section, a throat section and an expansion section. The airflow is compressed when passing through the throat section to form a compressed airflow, and then expands to reduce the pressure, thereby increasing the kinetic energy of the airflow, so that the airflow has a stronger diffusion ability and outlet speed.

[0080] The main reasons for using the Laval airway structure are as follows:

[0081] Improve airflow speed: The Laval airway structure can significantly improve the airflow speed, so that the smoke has a higher exit speed when entering the bronchial airway 212. This high-speed smoke can quickly carry the mixed powder, improving the contact efficiency between the smoke and the mixed powder.

[0082] As a further description of the reactor 3, in this embodiment, a stirring mechanism 208 is provided in the working room 204, including at least one horizontally rotating rotating rod and a stirring plate mounted on the rotating rod near the bed plate 202. The stirring plate is designed as a comb-tooth structure to avoid the air inlet cone 206, ensuring that the stirring process is not disturbed by the air inlet cone 206. The rotating rod is driven by a motor to rotate in the horizontal direction, and the stirring plate performs stirring motion driven by the rotating rod.

[0083] As a further description of the reactor 3, in this embodiment, the sound wave generator 207 is installed on the side wall of the working room 204, and generates high-frequency sound waves through electromagnetic vibration. The structure of the sound wave generator 207 mainly includes a motor, a vibrator and a sound wave generating head. The motor drives the vibrator to generate vibration, and the vibrator converts the vibration into high-frequency sound waves through the sound wave generating head.

[0084] It should be understood that the application of the acoustic wave generator 207 in the industrial flue gas carbon capture system is to improve the contact efficiency between particles and flue gas, thereby enhancing the carbon capture effect. The operating frequency of the acoustic wave generator 207 is between 20kHz and 40kHz, and the selection of this frequency range has many technical reasons and practical effects.

[0085] First, the particle size of steel slag powder is between 200-300 mesh, which is still a relatively large particle at the microscopic level. In this case, choosing an ultrasonic frequency of 20kHz to 40kHz can provide stronger kinetic energy. When a lower frequency ultrasonic wave (such as 20kHz) propagates in a medium, it can produce a larger amplitude and stronger kinetic energy, which is more effective for the vibration and movement of larger particles. Specifically, this kinetic energy can effectively cause the particles to oscillate or move at the microscopic level in the medium, enhancing the mutual collision and dispersion effect between the particles.

[0086] In this frequency range, ultrasound can effectively cause particles in the fluidized body to oscillate or move at a microscopic level. Specifically, when ultrasound propagates in the medium, it can generate effective interaction forces between particles, promote mutual collision and dispersion between particles, greatly increase the contact area between particles and flue gas, and thus improve reaction efficiency. In addition, the high-frequency vibration of ultrasound can destroy the attraction between particles, prevent them from agglomerating together, and maintain a uniform distribution of particles, which is particularly important for steel slag micropowder with a larger particle size of 200-300 mesh.

[0087] At the same time, the frequency range of 20kHz to 40kHz is higher than the hearing range of the human ear and will not cause noise pollution.

[0088] In addition, this frequency range also takes into account the power consumption and maintenance of the device. The ultrasonic generator 207 can work stably within this frequency range without generating excessive power consumption, and the life of the device can also be guaranteed.

[0089] Based on the above structure, the working process of the reactor 3 is as follows: First, the mixed powder enters the feed port 210 of the reactor 3. The feed port 210 is arranged above the bed plate 202 to ensure that the mixed powder can be evenly distributed on the bed plate 202.

[0090] After the air intake assembly 4 is started, the flue gas with carbon dioxide enters the air intake chamber 203 of the reactor 3 through the pipeline. The flue gas is uniformly sprayed onto the bed plate 202 through the air intake cone 206 under pressure, fully contacts with the mixed powder, forms a fluidized body with the mixed powder, and starts the reaction process.

[0091] At the same time, the stirring mechanism 208 is started, and the rotating rod drives the stirring plate to evenly stir the mixed powder in the fluidized body to ensure sufficient mixing of the reactants. The spraying mechanism 205 is also started synchronously, and the catalyst is evenly sprayed on the mixed powder in the fluidized body through the spraying mechanism 205 to further promote the reaction.

[0092] In the above process, the sound wave generator 207 emits high-frequency sound waves to enhance the vibration and mutual collision of particles, thereby improving the reaction speed and efficiency.

[0093] The dusty mixed gas after the reaction enters the collection device 5 through the exhaust port of the working room 204, and the mixed gas after the reaction is sent to the cyclone dust collector. The cyclone dust collector uses the rotating airflow to separate the dust and preliminarily purify the gas. The purified gas then enters the bag dust collector to further filter the residual dust to ensure that the discharged gas meets the environmental protection standards.

[0094] More specifically, the structure of the cyclone dust collector is mainly composed of an air inlet, a cylinder, a cone, an exhaust pipe and a dust outlet. The flue gas enters the cylinder of the cyclone dust collector through the air inlet. The interior of the cylinder is designed to be cylindrical. After entering the cylinder, the dust-carrying mixed gas rotates along the inner wall of the cylinder to form a rotating airflow. The rotating airflow separates the dust particles under the action of centrifugal force. The heavier dust particles are thrown to the inner wall of the cylinder and gradually sink to the bottom of the cone and are discharged through the dust outlet. The gas that has been preliminarily purified is discharged from the exhaust pipe in the center of the cylinder and enters the bag dust collector.

[0095] The structure of the bag filter is mainly composed of a box, filter bags, a dust cleaning system and an exhaust port. The gas after preliminary purification enters the box of the bag filter from the exhaust pipe of the cyclone dust collector. There are several filter bags in the box. The filter bags are made of high-efficiency filter materials and can effectively filter fine dust particles. When the gas passes through the filter bag, the dust particles are blocked on the surface of the filter bag, and the purified gas is discharged through the exhaust port. The dust cleaning system sends out the dust particles on the surface of the filter bag through regular vibration or back-blowing airflow to ensure the filtering effect and service life of the filter bag.

[0096] Through the above design and working process, the collection device 5 can efficiently and stably collect and purify the dust and gas generated after the reaction, ensuring that the discharged gas meets environmental protection standards. The system design is reasonable, and the various parts are closely matched, which effectively improves the dust removal and filtration efficiency and provides a reliable technical guarantee for the efficient carbon capture of industrial flue gas.

[0097] In order to prove the technical advantages of the embodiment, the superiority of the industrial flue gas carbon capture system in terms of treatment efficiency, carbon capture rate and environmental impact can be demonstrated through comparative experimental data. The following is a detailed comparative experiment and data description.

[0098] The experimental background is set in a steel plant, which processes 50,000 cubic meters of flue gas every day, the steel slag powder processing capacity is 360 tons / day, the catalyst injection amount is 6 tons / day, and the intake air volume is about 105,000 cubic meters per hour.

[0099] The technical parameters of the embodiment include: using an air inlet cone 206 with a Laval airway structure, the mass ratio of the catalyst to the steel slag powder in the mixing device 2 is 1:60. A double-shaft mixer and a spray assembly 205 are used to spray the catalyst twice. The bed plate 202 in the reactor 3 is designed as a wavy structure, which cooperates with the air inlet cone 206 to form a fluidized state. The collecting device 5 includes a cyclone dust collector and a bag dust collector.

[0100] The technical parameters of the comparative example are as follows: the inlet cone 206 of the Laval airway structure is not used, the mass ratio of the catalyst to the steel slag powder is 1:80, the catalyst composition is consistent with the embodiment, but only a single-shaft mixer and a single catalyst injection are used, the bed plate 202 in the reactor 3 is a porous flat plate, and only a simple gravity dust collector is used.

[0101] The data obtained through the experiment are as follows:

[0102] Carbon capture rate: The embodiment captures about 12,000 kg of carbon dioxide per day, with a carbon capture rate of 24%; the comparative example captures about 9,000 kg of carbon dioxide per day, with a carbon capture rate of 18%.

[0103] Treatment efficiency: The embodiment treats 50,000 cubic meters of flue gas per day, and the total treatment time is 12 hours; the comparative example treats 50,000 cubic meters of flue gas per day, and the total treatment time is 15 hours.

[0104] Environmental impact: The dust content in the exhaust gas of the embodiment is 0.25 grams per cubic meter, which meets the national environmental protection standards; the dust content in the exhaust gas of the comparative example is 0.37 grams per cubic meter, which is higher than that of the embodiment.

[0105] Catalyst utilization efficiency: The catalyst utilization rate of the embodiment is 85%; the catalyst utilization rate of the comparative example is 76%. The experimental results show that the carbon capture rate of the embodiment is significantly higher than that of the comparative example. This shows that the air intake cone 206 of the Laval airway structure and the two catalyst injection designs significantly improve the contact efficiency between the flue gas and the steel slag powder, and enhance the carbon capture effect. The total processing time of the embodiment is reduced by 3 hours compared with the comparative example, indicating that the fluidized state formed by the cooperation of the wavy bed plate 202 and the air intake cone 206 significantly improves the reaction speed and efficiency.

[0106] In terms of environmental impact, the dust content in the exhaust gas of the embodiment is significantly lower than that of the comparative example, which meets the national environmental protection standards, indicating that the combined design of the cyclone dust collector and the bag dust collector has a higher dust removal efficiency. In terms of catalyst utilization efficiency, the catalyst utilization rate of the embodiment is significantly higher than that of the comparative example, which means that the catalyst spraying method and the design of the mixer effectively improve the utilization effect of the catalyst and reduce waste.

[0107] It can be seen from these experimental data that this embodiment is superior to the comparative example in terms of carbon capture rate, treatment efficiency, environmental impact and catalyst use efficiency. These results prove the technical advantages of the embodiment and show that the system has significant advantages in practical applications. By optimizing the design of the air intake cone 206, improving the catalyst spraying method, adopting a double-shaft mixer and a wavy bed plate 202 structure, and an efficient collection device 5, the system can achieve efficient and environmentally friendly industrial flue gas carbon capture.

[0108] Although the exemplary embodiments of the present disclosure have been described, it should be understood by those skilled in the art that various changes and modifications can be made to the exemplary embodiments of the present disclosure without departing from the spirit and scope of the present disclosure in essence. Therefore, all changes and modifications are included in the scope of protection of the present disclosure as defined by the claims. The present disclosure is defined by the appended claims, and the equivalents of these claims are also included.

Claims

1. A carbon capture system for industrial flue gas, characterized in that: The system comprises: a mixing device for mixing steel slag powder with a catalyst, a feeding device for feeding steel slag powder into the mixing device, a reactor connected to the mixing device, an air intake assembly for feeding flue gas with carbon dioxide into the reactor, and a collecting device connected to the reactor and used for collecting dust, wherein: The feeding device comprises a raw material bin, an intermediate bin connected to the raw material bin, and a vibration filter assembly installed at the discharge port of the intermediate bin, and the vibration filter assembly feeds the filtered steel slag powder into the mixing device; The mixing device comprises a mixer and a spray assembly inserted into the mixer for spraying the catalyst. The mixer and the spray assembly mix the steel slag powder and the catalyst into a mixed powder and then send the mixed powder into the reactor; The reactor comprises a cylindrical body, a bed plate that divides the internal space of the body into an air inlet chamber at the top and a working chamber at the bottom, a plurality of air inlet cones evenly arranged on the bed plate, a stirring mechanism arranged in the working chamber and cooperating with the bed plate, a spraying mechanism located above the bed plate and used for spraying the catalyst, and at least one sound wave generator located in the working chamber; The main body is provided with an air inlet connected to the air inlet chamber, and the air inlet is connected to the air inlet assembly through a pipeline; the air inlet cone is connected to the air inlet chamber; The working room is provided with a feed port connected to the mixing device, and the mixed powder is delivered to the bed plate from the feed port; The spray mechanism comprises a plurality of spray rods and self-spinning nozzles arranged on the spray rods; An exhaust port is provided on the working room, and the exhaust port is connected to the collecting device through a pipeline; The collecting device includes a cyclone dust collector and a bag dust collector connected to the air outlet of the cyclone dust collector; The air intake cone has a vertical main air channel and a plurality of branch channels connected to the main air channel and inclined at 45 degrees toward the bed plate; the branch channels are Laval channels; The vibration filter assembly feeds 200-300 mesh slag powder into the feeding assembly, and the vibration filter assembly has at least one mesh plate with 200-300 mesh holes and a driving unit for driving the mesh plate to vibrate at high frequency; The sound wave generator is an ultrasonic generator with a sound frequency of 20kHz-40kHz.

2. The industrial flue gas carbon capture system as claimed in claim 1, characterized in that: The mixer in the mixing device is a double-shaft mixer.

3. The industrial flue gas carbon capture system as claimed in claim 1, characterized in that: The upper surface of the bed board is wavy and concave and convex.

4. The industrial flue gas carbon capture system as claimed in claim 1, characterized in that: The self-spinning nozzle comprises a base connected to the spray rod, and a nozzle head rotatably mounted on the base and connected to the base. When the nozzle head is working, the spray pressure is used to realize self-spin based on the base.

5. The industrial flue gas carbon capture system as claimed in claim 1, characterized in that: The stirring mechanism comprises at least one horizontally rotating rotating rod and a stirring plate installed on the rotating rod close to the bed plate, wherein the stirring plate in a comb-tooth structure avoids the air intake cone.

6. The industrial flue gas carbon capture system as claimed in claim 1, characterized in that: A booster pump is installed at the air inlet of the main body.

7. The industrial flue gas carbon capture system as claimed in claim 1, characterized in that: The body has an outer temperature layer to reduce heat loss of the body and improve reaction temperature and efficiency.

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