Cement kiln carbon dioxide trapping and purifying device and method

Abstract

The invention relates to the technical field of carbon dioxide trapping, and particularly discloses a cement kiln carbon dioxide trapping and purifying device which comprises a cooling cabin and a trapping and purifying tank containing ammonia water which are arranged in sequence, a first gas inlet pipe is arranged at the bottom of the cooling cabin; a heat exchange plate is arranged in the middle of the cooling cabin; a second gas inlet pipe communicated with the top of the trapping and purifying tank and a third gas inlet pipe communicated with the bottom of the trapping and purifying tank are arranged at the top of the cooling cabin; the multiple heat exchange plates are distributed on the two sides of the inner wall of the cooling cabin to form a bent airflow channel. The device can efficiently capture and purify carbon dioxide, and is simple in structure and suitable for popularization.

Description

Technical Field

[0001] The present invention relates to the technical field of carbon dioxide capture, and in particular to a device for capturing and purifying carbon dioxide in a cement kiln, and also to a method for capturing and purifying carbon dioxide in a cement kiln. Background Art

[0003] Key sources of carbon dioxide emissions include: fossil energy (coal, oil, natural gas, etc.), thermal power generation, steel, cement, glass kilns, petrochemicals, transportation, etc. Industrial kilns, especially cement kilns, are widely used in building materials, petrochemicals, steel and other industries, playing an important supporting role in industrial development, and are also the main emission sources in the industrial field.

[0005] In the prior art, a method for capturing carbon dioxide in flue gas is disclosed in a Chinese invention patent with application number 202210286815.5. The invention uses air as a refrigerant, which is safe, green, and widely available. The device and process implementation method used have a low threshold and are more conducive to promotion. At the same time, the method has an energy storage function and is not completely dependent on external energy. The compressed air drive system can be operated using any form of energy. In combination with the above application and in connection with the existing capture device, when the existing capture method is used to capture carbon dioxide, in the process of washing carbon dioxide through a carbon dioxide washing tower, the purified flue gas is passed into the carbon dioxide washing tower and adsorbed by contact between gas and liquid.

[0006] However, during the adsorption process, if the contact between the gas and the liquid is insufficient, it will affect the capture efficiency and cause partial carbon dioxide emissions, thus affecting the practicality and capture efficiency of the device. Summary of the invention

[0008] In view of this, the present invention provides a cement kiln carbon dioxide capture and purification device to improve the capture efficiency of carbon dioxide in the cement kiln.

[0009] In order to achieve the above-mentioned object, the basic scheme of the present invention provides a cement kiln carbon dioxide capture and purification device, comprising a cooling chamber and a capture and purification tank containing ammonia water arranged in sequence; The cooling chamber is provided with a first air inlet pipe at the bottom, a heat exchange plate in the middle, and a second air inlet pipe and a third air inlet pipe at the top; The capture and purification tank is provided with a mixed liquid input pipe, wherein a circulation pump is provided outside the capture and purification tank, one end of the circulation pump is connected to the middle of the capture and purification tank through a liquid extraction pipe, and the other end of the circulation pump is connected to the top of the mixed liquid input pipe through a liquid discharge pipe, an ejector is provided in the middle of the mixed liquid input pipe, and the air inlet of the ejector is connected to the second air inlet pipe; The capture and purification tank is also provided with a liquid outlet pipe for outputting ammonia water after capturing carbon dioxide and an exhaust pipe for exhausting tail gas.

[0010] In a possible design, it also includes a screw conveying mechanism and a rotating shaft rotatably arranged at the bottom of the capture and purification tank, the rotating shaft is provided with a paddle that can drive the rotating shaft to rotate, the bottom opening of the mixed liquid input pipe is opposite to the paddle, so that the paddle rotates with the gushing of the gas-liquid mixture; there are two screw conveying mechanisms, and they are symmetrically distributed on both sides of the paddle; the screw conveying mechanism includes a conveying pipe, a conveying shaft rotatably arranged in the conveying pipe, the conveying shaft is axially provided with spiral conveying blades, the lower end of the conveying shaft extends out of the conveying pipe and is connected to the rotating shaft by a universal coupling, the bottom of the conveying pipe is provided with a slag inlet, and the top of the conveying pipe extends out of the capture and purification tank and is provided with a slag discharge port.

[0011] In a possible design, a plurality of heat exchange plates are provided and are respectively distributed on both sides of the inner wall of the cooling chamber to form a bent air flow channel; a plurality of water pipes are provided in the heat exchange plate.

[0012] In a possible design, it also includes a bottom inflation mechanism, which includes a bottom air cavity, a tympanic membrane that closes the opening of the bottom air cavity, a first magnet block fixed on the paddle, a second magnet block fixed on the tympanic membrane, a first one-way valve that only allows gas to enter the bottom air cavity from the cooling chamber, and a second one-way valve that only allows gas to enter the capture and purification tank from the bottom air cavity. The third air inlet pipe is connected to the bottom air cavity and the first one-way valve is arranged at the connection point, and the second one-way valve is arranged on the tympanic membrane. The first magnet block and the second magnet block repel each other magnetically. The paddle and the first magnet block are fixed by bolts, and the second magnet block and the tympanic membrane are fixed by bonding.

[0013] In a possible design, the slag discharge port at the top of the conveying pipe is arranged downward, and a liquid discharge hole is provided in the middle of the conveying pipe.

[0014] In a possible design, the tank body of the capture and purification tank is a double-layer design.

[0015] In a possible design, a diffusion section is provided at the bottom of the mixed liquid input pipe, the size of the diffusion section gradually increases from top to bottom, and the bottom opening of the diffusion section faces the blade.

[0016] In a possible design, the universal coupling is a cross universal coupling.

[0017] In a possible design, the cooling cabin is provided with a cabin door that slides open at one end away from the first air inlet pipe.

[0018] The present invention also provides a method for capturing and purifying carbon dioxide in a cement kiln. The method is based on the above-mentioned device for capturing and purifying carbon dioxide in a cement kiln, and comprises the following steps: Step 1, sending the cement kiln exhaust gas into the cooling chamber through the first air inlet pipe, using the heat exchange plate to cool the cement kiln exhaust gas and realize waste heat utilization; Step 2, start the circulation pump, the cooled cement kiln exhaust gas enters the capture and purification tank through the second air inlet pipe and the third air inlet pipe, the carbon dioxide therein is absorbed by the ammonia water in the capture and purification tank, and the remaining tail gas is discharged through the exhaust pipe for centralized treatment.

[0019] Compared with the prior art, the principles and effects of the present invention are as follows: The setting of the circulation pump can realize the continuous circulation injection of ammonia water. In the circulation injection process of ammonia water, the ammonia water is mixed with the cement kiln exhaust gas in the second air inlet pipe through the ejector, which not only realizes the sufficient contact time between the ammonia water and the carbon dioxide in the cement kiln exhaust gas, but also the mixed high-pressure gas-liquid mixture rushes to the liquid surface of the ammonia water. While part of the ammonia water is atomized to increase the carbon dioxide capture effect, it can also stir the ammonia water to avoid the ammonia water and carbon dioxide being captured only at the liquid surface, so that most of the ammonia water can contact with the carbon dioxide, and the circulation pump works continuously to continuously drive the ammonia water and the carbon dioxide in the cement kiln exhaust gas to contact each other. The strong kinetic energy of the mixture of ammonia water and cement kiln exhaust gas gushing out from the mixed liquid inlet pipe can also drive the blades to rotate, which can not only further increase the scope of the ammonia water and cement kiln exhaust gas mixture, but also make the rotation of the blades drive the rotation of the shaft, and then drive the conveying shaft to rotate through the universal coupling, so that the slag, dust brought by the cement kiln exhaust gas and the sludge produced by the reaction with ammonia water are discharged from the capture and purification tank, providing sufficient space for ammonia water to capture and purify carbon dioxide, and the rotation of the blades can also drive the first magnet block to continuously interact with the second magnet block. When the magnet block approaches the second magnet block, due to the magnetic repulsion between the first magnet block and the second magnet block, the repulsive force between the two further squeezes the eardrum, reducing the volume of the bottom air cavity, and the cement kiln exhaust gas in the bottom air cavity enters the capture and purification tank through the second one-way valve, which can not only fully realize the mixing reaction of cement kiln exhaust gas and ammonia water, but also play a role in blowing air, generating turbulence in ammonia water, further increasing the contact probability and area of ​​ammonia water and carbon dioxide, and moreover, it cooperates with the mixed liquid input pipe to realize the upper and lower clamping of ammonia water, and realizes the multi-faceted and multi-dimensional mixing of carbon dioxide in cement kiln exhaust gas and ammonia water. When the first magnet block moves away from the second magnet block, the eardrum recovers under the action of its own elastic force, the volume of the bottom air cavity increases, and the cement kiln exhaust gas enters the bottom air cavity from the cooling chamber through the third air inlet pipe and the second one-way valve for replenishment, and this cycle is repeated. In this process, due to the breathing-like deformation of the eardrum, slag or sludge can be avoided from accumulating thereon, so that the cleaning effect of the spiral conveying mechanism is guaranteed. Such a multi-pronged approach is closely linked, which not only fully realizes the contact, capture and purification of ammonia water and carbon dioxide in cement kiln exhaust gas, but also greatly improves the capture and purification efficiency of carbon dioxide by the entire device. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0022] Figure 1 A three-dimensional diagram of a cement kiln carbon dioxide capture and purification device proposed in an embodiment of the present application is shown; Figure 2 A rear view of a cement kiln carbon dioxide capture and purification device proposed in an embodiment of the present application is shown; Figure 3 A top view of a cement kiln carbon dioxide capture and purification device proposed in an embodiment of the present application is shown; Figure 4 Shows Figure 3 AA section view; Figure 5 Shows Figure 4 CC section view; Figure 6 A bottom view of a cement kiln carbon dioxide capture and purification device proposed in an embodiment of the present application is shown; Figure 7 Shows Figure 6 BB section view. DETAILED DESCRIPTION

[0024] To further illustrate each embodiment, the present invention provides drawings, which are part of the disclosure of the present invention and are mainly used to illustrate the embodiments and can be used in conjunction with the relevant descriptions in the specification to explain the operating principles of the embodiments. With reference to these contents, ordinary technicians in the field should be able to understand other possible implementations and advantages of the present invention. The components in the figures are not drawn to scale, and similar component symbols are generally used to represent similar components.

[0025] Description of reference numerals: Capturing tank 1, cooling chamber 2, mixed liquid input pipe 3, ejector 4, liquid outlet pipe 5, exhaust pipe 6, spiral conveying pipe 7, circulating pump 8, liquid extraction pipe 9, liquid discharge pipe 10, cabin door 11, second air inlet pipe 12, heat exchange plate 13, first air inlet pipe 14, third air inlet pipe 15, conveying shaft 16, universal coupling 17, paddle 18, rotating shaft 19, liquid discharge hole 20, diffusion section 21, bracket 22, first one-way valve 23, second magnet block 24, second one-way valve 25, first magnet block 26, diaphragm 27, slag inlet 28, tympanic membrane 29.

[0026] like Figure 1-7As shown, the embodiment of the present invention discloses a cement kiln carbon dioxide capture and purification device, including a cooling chamber 2 and a capture and purification tank containing ammonia water arranged in sequence; Figure 1 , 2 As shown, the cooling chamber 2 is provided with a first air inlet pipe 14 at the bottom, a heat exchange plate 13 in the middle, a second air inlet pipe 12 connected to the top of the capture and purification tank, and a third air inlet pipe 15 connected to the bottom of the capture and purification tank at the top; a plurality of water pipes are provided in the heat exchange plate 13, and cooling water is introduced into the water pipes for circulation to achieve cooling of the cement kiln exhaust gas by the heat exchange plate 13. The heat exchange plate 13 is provided with a plurality of air inlet pipes 14 and 15 are respectively distributed on both sides of the inner wall of the cooling chamber 2 to form a bent air flow channel. The setting of the air flow channel can increase the contact time and contact area between the heat exchange plate 13 and the cement kiln exhaust gas, so as to achieve sufficient cooling of the cement kiln exhaust gas. Since the present application adopts the method of capturing and purifying carbon dioxide with ammonia water, and ammonia water is easy to evaporate and mix with the cement kiln exhaust gas when the temperature is too high, for this reason, a cooling chamber 2 is specially provided to cool the cement kiln exhaust gas, and at the same time, it can also realize the recovery and utilization of the waste heat of the cement kiln exhaust gas.

[0027] like Figure 3-5 As shown, the capture and purification tank is provided with a mixed liquid input pipe 3, a rotating shaft 19 rotatably arranged at the bottom of the capture and purification tank, a screw conveying mechanism and a bottom blowing mechanism from top to bottom; wherein a circulating pump 8 is provided outside the capture and purification tank, one end of the circulating pump 8 is connected to the middle of the capture and purification tank through a liquid extraction pipe 9, the position of the liquid extraction pipe 9 needs to be located below the liquid level of the ammonia solution, and the other end of the circulating pump 8 is connected to the top of the mixed liquid input pipe 3 through a liquid discharge pipe 10. The setting of the circulating pump 8 can realize the continuous circulation and injection of ammonia solution. At the same time, an ejector 4 is provided in the middle of the mixed liquid input pipe 3, and the air inlet of the ejector 4 is connected to the second air inlet pipe 12; a paddle 18 that can drive the rotating shaft 19 to rotate is provided on the rotating shaft 19, and a The diffusion section 21 has a size that gradually increases from top to bottom. The bottom opening of the diffusion section 21 faces the paddle 18 so that the paddle 18 rotates with the gushing of the gas-liquid mixture. The setting of the diffusion section 21 not only increases the impact range of the ammonia water and cement kiln exhaust gas mixture, but also can atomize part of the ammonia water to a certain extent, thereby increasing the capture range and dimension of ammonia water for carbon dioxide. The spiral conveying mechanism includes a conveying pipe and a conveying shaft 16 rotatably arranged in the conveying pipe. The conveying shaft 16 is axially provided with spiral conveying blades. The lower end of the conveying shaft 16 extends out of the conveying pipe and is connected to the rotating shaft 19 through a universal coupling 17. A slag inlet 28 is provided at the bottom of the conveying pipe, and a slag discharge port is provided at the top of the conveying pipe extending out of the capture and purification tank.

[0028] like Figure 6-7As shown, the bottom inflation mechanism includes a bottom air cavity, a tympanic membrane 29 that closes the opening of the bottom air cavity, a first magnet block 26 fixed on the paddle 18, a second magnet block 24 fixed on the tympanic membrane 29, a first one-way valve 23 that only allows gas to enter the bottom air cavity from the cooling chamber 2, and a second one-way valve 25 that only allows gas to enter the capture and purification tank from the bottom air cavity. The third air inlet pipe 15 is connected to the bottom air cavity and the first one-way valve 23 is arranged at the connection point, and the second one-way valve 25 is arranged on the tympanic membrane 29. The first magnet block 26 and the second magnet block 24 repel each other magnetically. The first magnet block 26 and the second magnet block 24 can be made of sintered NdFeB, and the surface of the sintered NdFeB needs to be plated, generally with zinc, nickel, environmentally friendly zinc, environmentally friendly nickel, nickel-copper-nickel, environmentally friendly nickel-copper-nickel, etc.During the circulation injection of ammonia water, the ammonia water is mixed with the cement kiln exhaust gas in the second air inlet pipe 12 through the ejector 4, which not only realizes the sufficient contact time between the ammonia water and the carbon dioxide in the cement kiln exhaust gas, but also the mixed high-pressure gas-liquid mixture rushes to the liquid surface of the ammonia water, and while part of the ammonia water is atomized to increase the carbon dioxide capture effect, it can also stir the ammonia water, avoiding that only the ammonia water at the liquid surface is captured with the carbon dioxide, so that most of the ammonia water can contact with the carbon dioxide, and the circulation pump 8 keeps working to drive the ammonia water to mix and capture the carbon dioxide in the cement kiln exhaust gas, and keeps gushing out from the mixed liquid input pipe 3. The strong kinetic energy of the ammonia water and cement kiln waste gas mixture can also drive the blade 18 to rotate, which can not only further increase the scope of the ammonia water and cement kiln waste gas mixture, but also make the blade 18 rotate to drive the rotating shaft 19 to rotate, and then drive the conveying shaft 16 to rotate through the universal joint 17, so that the slag, dust brought by the cement kiln waste gas and the sludge produced by the reaction with ammonia water are discharged from the capture and purification tank, providing sufficient space for ammonia water to capture and purify carbon dioxide, and the rotation of the blade 18 can also drive the first magnet block 26 to continuously generate linkage with the second magnet block 24. When the first magnet block 26 is close to the second magnet block When the first magnet block 26 and the second magnet block 24 are magnetically repelled, the repulsive force of the two further squeezes the eardrum 29, so that the volume of the bottom air cavity is reduced, and the cement kiln exhaust gas in the bottom air cavity enters the capture and purification tank through the second one-way valve 25, which can not only fully realize the mixing reaction of the cement kiln exhaust gas and ammonia water, but also play a role of blowing air, generating turbulence in the ammonia water, further increasing the contact probability and area of ​​the ammonia water and the carbon dioxide, and moreover, it cooperates with the mixed liquid input pipe 3 to realize the upper and lower clamping of the ammonia water, and realizes the multi-faceted and multi-dimensional mixed contact of the carbon dioxide in the cement kiln exhaust gas and the ammonia water. When the iron block 26 moves away from the second magnet block 24, the eardrum 29 recovers under the action of its own elastic force, the volume of the bottom air cavity increases, and the cement kiln exhaust gas enters the bottom air cavity from the cooling chamber 2 through the third air inlet pipe 15 and the second one-way valve 25 for replenishment, and this cycle is repeated. In this process, due to the breathing-like deformation of the eardrum 29, slag or sludge can be avoided from accumulating thereon, so that the cleaning effect of the spiral conveying mechanism is guaranteed. Such a multi-pronged approach is closely linked, which not only fully realizes the contact, capture and purification of ammonia water and carbon dioxide in cement kiln exhaust gas, but also greatly improves the capture and purification efficiency of carbon dioxide by the entire device.

[0029] The capture and purification tank is also provided with a liquid outlet pipe 5 for outputting ammonia water after capturing carbon dioxide and an exhaust pipe 6 for exhausting tail gas. The lower end of the liquid outlet pipe 5 is located below the liquid level of the ammonia water. After the ammonia water captures and purifies the carbon dioxide in the cement kiln exhaust gas, the ammonia water is pumped out through the liquid pump and the liquid outlet pipe 5 for subsequent treatment. A diaphragm 27 is provided at the bottom of the exhaust pipe 6. The diaphragm 27 can prevent ammonia water or water from passing through, while the tail gas, that is, the cement kiln exhaust gas after the carbon dioxide is absorbed, can pass through. The specific diaphragm 27 can be a waterproof and breathable membrane.

[0030] Preferably, in order to reduce interference with the first magnet block 26 and the second magnet block 24, the components of the capture and purification tank in the present invention are made of non-ferromagnetic materials such as non-magnetic steel as much as possible.

[0031] Among them, Figure 5 As shown, two spiral conveying mechanisms are provided and symmetrically distributed on both sides of the blade 18, which can greatly improve the discharge efficiency of the residue, sludge, etc. at the bottom of the capture and purification tank.

[0032] The blade 18 is fixed to the first magnet block 26 by bolts, and the second magnet block 24 is fixed to the eardrum 29 by bonding, and the fixing method is firm and reliable.

[0033] Among them, the slag discharge port on the top of the conveying pipe is set downward, and a drainage hole 20 is provided in the middle of the conveying pipe. A collecting trough can be set below the slag discharge port to collect and process sludge or slag. The drainage hole 20 is mainly to facilitate the discharge of ammonia water in the conveying pipe to avoid being carried out in large quantities by sludge or slag. For better effect, the drainage hole 20 can be set above the ammonia water level.

[0034] Among them, the tank body of the capture and purification tank is a double-layer design, and the temperature of the capture and purification tank can be controlled by connecting to the water inlet pipe and the water outlet pipe, so as to facilitate maintaining the optimal temperature range for ammonia water to absorb carbon dioxide.

[0035] Among them, the universal coupling 17 is a cross universal coupling 17, which has a large angular compensation amount and the angles between the two axes are different, generally between 5°-45°. The cross universal coupling 17 can make the two axes that are not on the same axis, have a large axis angle, and have a large axial movement rotate continuously at the same angular speed, which is just suitable for the connection transmission between the transfer shaft 19 and the conveying shaft 16 in this application.

[0036] Among them, the cooling cabin 2 is provided with a sliding door 11 at one end away from the first air inlet pipe 14. A slide rail can be set on the ground below the door 11 for the door 11 to slide open and close. The setting of the door 11 facilitates the cleaning and maintenance of the cooling cabin 2. Of course, a sealing structure such as a sealing ring can be set between the door 11 and the cabin body of the cooling cabin 2 to improve the sealing performance.

[0037] The present invention also provides a method for capturing and purifying carbon dioxide in a cement kiln. The method is based on the above-mentioned device for capturing and purifying carbon dioxide in a cement kiln, and comprises the following steps: Step 1, sending the cement kiln exhaust gas into the cooling chamber 2 through the first air inlet pipe 14, and using the heat exchange plate 13 to cool the cement kiln exhaust gas and realize waste heat utilization; Step 2, start the circulation pump 8, the cooled cement kiln exhaust gas enters the capture and purification tank through the second air inlet pipe 12 and the third air inlet pipe 15, the carbon dioxide therein is absorbed by the ammonia water in the capture and purification tank, and the remaining tail gas is discharged through the exhaust pipe 6 for centralized treatment.

[0038] The present invention also provides a method for capturing and purifying carbon dioxide in a cement kiln. The method is based on the above-mentioned device for capturing and purifying carbon dioxide in a cement kiln, and comprises the following steps: Step 1, sending the cement kiln exhaust gas into the cooling chamber 2 through the first air inlet pipe 14, and using the heat exchange plate 13 to cool the cement kiln exhaust gas and realize waste heat utilization; Step 2, start the circulation pump 8, the cooled cement kiln exhaust gas enters the capture and purification tank through the second air inlet pipe 12 and the third air inlet pipe 15, the carbon dioxide therein is absorbed by the ammonia water in the capture and purification tank, and the remaining tail gas is discharged through the exhaust pipe 6 for centralized treatment.

[0039] The present invention also provides a computer-readable storage medium, wherein the computer-readable storage medium stores computer-executable instructions, and the computer-executable instructions are used to enable a computer to implement the aforementioned cement kiln carbon dioxide capture and purification method.

[0040] Although the above methods are illustrated and described as a series of actions for simplicity of explanation, it should be understood and appreciated that these methods are not limited by the order of the actions, because according to one or more embodiments, some actions may occur in different orders and / or concurrently with other actions from the illustrations and descriptions herein or not illustrated and described herein but understandable to those skilled in the art. It will be further appreciated by those skilled in the art that the various illustrative logic blocks, modules, circuits, and algorithm steps described in conjunction with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or a combination of the two. To clearly explain this interchangeability of hardware and software, various illustrative components, frames, modules, circuits, and steps are generally described in the form of their functionality above. Whether such functionality is implemented as hardware or software depends on the specific application and the design constraints imposed on the overall system. The technical staff can implement the described functionality in different ways for each specific application, but such implementation decisions should not be interpreted as resulting in a departure from the scope of the present invention. The various illustrative logic blocks, modules, and circuits described in conjunction with the embodiments disclosed herein may be implemented or executed with a general purpose processor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described herein. A general purpose processor may be a microprocessor, but in an alternative, the processor may be any conventional processor, a battery compartment control board, a micro-battery compartment control board, or a state machine. The processor may also be implemented as a combination of computing devices, such as a combination of a DSP and a microprocessor, multiple microprocessors, one or more microprocessors in cooperation with a DSP core, or any other such configuration. The steps of the methods or algorithms described in conjunction with the embodiments disclosed herein may be embodied directly in hardware, in a software module executed by a processor, or in a combination of the two. The software module may reside in RAM memory, flash memory, ROM memory, EPROM memory, EEPROM memory, registers, hard disk, removable disk, CD-ROM, or any other form of storage medium known in the art. An exemplary storage medium is coupled to a processor so that the processor can read and write information from / to the storage medium. In an alternative, the storage medium may be integrated into the processor. The processor and the storage medium may reside in an ASIC. The ASIC may reside in a user terminal. In an alternative, the processor and the storage medium may reside in a user terminal as discrete components. In one or more exemplary embodiments, the functions described may be implemented in hardware, software, firmware, or any combination thereof. If implemented as a computer program product in software, each function may be stored on a computer-readable medium or transmitted therefrom as one or more instructions or codes.Computer-readable media include both computer storage media and communication media, including any media that facilitates a computer program to be transferred from one place to another. Storage media can be any available media that can be accessed by a computer. As an example and not limitation, such computer-readable media may include RAM, ROM, EEPROM, CD-ROM or other optical disk storage, disk storage or other magnetic storage devices, or any other media that can be used to carry or store the agreed program code in the form of instructions or data structures and can be accessed by a computer. Any connection is also properly referred to as computer-readable media. For example, if software is transmitted from a web site, a central control computer, or other remote sources using coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL), or wireless technologies such as infrared, radio, and microwaves, then the coaxial cable, fiber optic cable, twisted pair, DSL, or wireless technologies such as infrared, radio, and microwaves are included in the definition of medium. As used herein, disk and disc include compact disc (CD), laser disc, optical disc, digital versatile disc (DVD), floppy disk and Blu-ray disc, wherein disk often reproduces data magnetically, while disc reproduces data optically with laser. The above combination should also be included in the scope of computer-readable media. The above description is only a preferred embodiment of the present invention, and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technician in this field can make some changes or modify the technical content disclosed above to an equivalent embodiment of equivalent changes without departing from the scope of the technical solution of the present invention. However, any brief modification, equivalent change and modification made to the above embodiment according to the technical essence of the present invention without departing from the content of the technical solution of the present invention still belongs to the scope of the technical solution of the present invention.

Claims

1. A cement kiln carbon dioxide capture and purification device, characterized in that: It includes a cooling chamber and a capture and purification tank containing ammonia water, which are arranged in sequence; The cooling chamber is provided with a first air inlet pipe at the bottom, a heat exchange plate in the middle, and a second air inlet pipe and a third air inlet pipe at the top; The capture and purification tank is provided with a mixed liquid input pipe, wherein a circulation pump is provided outside the capture and purification tank, one end of the circulation pump is connected to the middle of the capture and purification tank through a liquid extraction pipe, and the other end of the circulation pump is connected to the top of the mixed liquid input pipe through a liquid discharge pipe, an ejector is provided in the middle of the mixed liquid input pipe, and the air inlet of the ejector is connected to the second air inlet pipe; The capture and purification tank is also provided with a liquid outlet pipe for outputting ammonia water after capturing carbon dioxide and an exhaust pipe for exhausting tail gas.

2. A cement kiln carbon dioxide capture and purification device according to claim 1, characterized in that: It also includes a screw conveying mechanism and a rotating shaft rotatably arranged at the bottom of the capture and purification tank, the rotating shaft is provided with a paddle that can drive the rotating shaft to rotate, the bottom opening of the mixed liquid input pipe is opposite to the paddle, so that the paddle rotates with the gushing of the gas-liquid mixture; there are two screw conveying mechanisms, and they are symmetrically distributed on both sides of the paddle; the screw conveying mechanism includes a conveying pipe, a conveying shaft rotatably arranged in the conveying pipe, the conveying shaft is axially provided with spiral conveying blades, the lower end of the conveying shaft extends out of the conveying pipe and is connected to the rotating shaft by a universal coupling, the bottom of the conveying pipe is provided with a slag inlet, and the top of the conveying pipe extends out of the capture and purification tank and is provided with a slag discharge port.

3. A cement kiln carbon dioxide capture and purification device according to claim 2, characterized in that: A plurality of heat exchange plates are provided and are respectively distributed on both sides of the inner wall of the cooling chamber to form a bent air flow channel; a plurality of water pipes are provided in the heat exchange plate.

4. A cement kiln carbon dioxide capture and purification device according to claim 3, characterized in that: It also includes a bottom inflation mechanism, which includes a bottom air cavity, a tympanic membrane that closes an opening of the bottom air cavity, a first magnet block fixed on the paddle, a second magnet block fixed on the tympanic membrane, a first one-way valve that only allows gas to enter the bottom air cavity from the cooling chamber, and a second one-way valve that only allows gas to enter the capture and purification tank from the bottom air cavity. The third air inlet pipe is connected to the bottom air cavity and the first one-way valve is arranged at the connection point, and the second one-way valve is arranged on the tympanic membrane. The first magnet block and the second magnet block repel each other magnetically. The paddle and the first magnet block are fixed by bolts, and the second magnet block and the tympanic membrane are fixed by bonding.

5. A cement kiln carbon dioxide capture and purification device according to claim 4, characterized in that: The slag discharge port at the top of the conveying pipe is arranged downward, and a liquid discharge hole is arranged in the middle of the conveying pipe.

6. A cement kiln carbon dioxide capture and purification device according to any one of claims 1 to 5, characterized in that: The tank body of the capture and purification tank is a double-layer design.

7. A cement kiln carbon dioxide capture and purification device according to any one of claims 1 to 5, characterized in that: A diffusion section is arranged at the bottom of the mixed liquid input pipe, the size of the diffusion section gradually increases from top to bottom, and the bottom opening of the diffusion section faces the blade.

8. A cement kiln carbon dioxide capture and purification device according to claim 7, characterized in that: The universal coupling is a cross universal coupling.

9. A cement kiln carbon dioxide capture and purification device according to any one of claims 1 to 5 or 8, characterized in that: The cooling cabin is provided with a cabin door which can be slid open at one end away from the first air inlet pipe.

10. A method for capturing and purifying carbon dioxide in a cement kiln, characterized in that: The method is based on the cement kiln carbon dioxide capture and purification device according to any one of claims 1 to 9, comprising the following steps: Step 1, sending the cement kiln exhaust gas into the cooling chamber through the first air inlet pipe, using the heat exchange plate to cool the cement kiln exhaust gas and realize waste heat utilization; Step 2, start the circulation pump, the cooled cement kiln exhaust gas enters the capture and purification tank through the second air inlet pipe and the third air inlet pipe, the carbon dioxide therein is absorbed by the ammonia water in the capture and purification tank, and the remaining tail gas is discharged through the exhaust pipe for centralized treatment.

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