A system and method for recycling fine aggregate from carbonized concrete using drying waste gas

Abstract

The present invention provides a system for recycling and utilizing drying waste gas to carbonize recycled fine aggregate of concrete, comprising a drying and carbonizing device, a combustion waste gas collection device, a water vapor supply device, and a carbonization waste gas collection and recycling device; the drying and carbonizing device is used to dry and carbonize the recycled fine aggregate to be dried and carbonized placed inside, and the generated carbonization waste gas is transported to the carbonization waste gas collection and recycling device, and the generated combustion waste gas is transported to the combustion waste gas collection device; the carbonization waste gas collection and recycling device processes the carbonization waste gas and then recycles it back to the drying and carbonizing device; the water vapor supply device is used to generate water vapor; the combustion waste gas collection device is used to collect the generated combustion waste gas and then transport it back to the drying and carbonizing device. In addition, the present invention also includes a method for the system, which can carry out carbon fixation, green production, and reuse the waste gas generated by the system, recycle CO2, and not emit CO2, thereby achieving green production in the true sense and realizing the implementation of the dual carbon policy in the construction industry.

Description

Technical Field

[0001] The present invention belongs to the technical field of carbon fixation in recycled concrete fine aggregate, and specifically relates to equipment and methods for recycling carbon dioxide in drying waste gas and fixing carbon dioxide in recycled concrete fine aggregate during the drying process, and more particularly to a system and method for recycling drying waste gas to carbonize recycled concrete fine aggregate. Background Art

[0002] Since the last century, with the acceleration of industrialization and the explosive growth of the global population, the global climate has undergone significant changes. Taking atmospheric temperature as an example, from 1970 to 2012, the global temperature has risen by 0.5℃. If the current trend of temperature increase is maintained, by the end of this century, the global temperature will rise by 1.4℃ to 5.8℃ based on the 2012 level. As for the CO2 concentration in the atmosphere, with the substantial use of fossil fuels, its concentration has also been rising. If the global CO2 gas emissions are not controlled, by the end of this century, the CO2 concentration in the atmosphere may reach 1964mg / m 3 In order to cope with the greenhouse effect caused by the continuous accumulation of CO2 in the atmosphere, which has led to a series of environmental problems, with the proposal of the dual carbon concept, in addition to energy conservation and emission reduction, carbon sequestration has become a hot research topic in all walks of life.

[0003] CO2 from traditional industrial production processes is directly emitted into the atmosphere, and at best, it is simply sealed for a short period of time. In the building materials industry, some researchers are able to capture and purify CO2 emitted from industrial production processes, and then put it into the production process of new building materials for recycling, rather than simply sealing it or directly discharging it. This will first of all produce good ecological benefits; secondly, the performance of the recycled aggregate after CO2 carbonization is improved, its water absorption rate is reduced, the apparent density is increased, and the crushing index is reduced. The concrete produced using the carbonized aggregate has increased compressive strength and has significantly improved durability, reduced chloride ion permeability, and significantly improved carbonization resistance. Therefore, the recycled aggregate processed by this system will also produce relatively good economic benefits in subsequent construction production.

[0004] However, there are the following problems. Specifically, when recycled fine aggregate from concrete is used as the raw material for dry mortar, it needs to be dried and graded. The drying process often uses natural gas for heating, which produces a large amount of carbon dioxide. The traditional drying system directly discharges the waste gas into the atmosphere. The waste gas has a high concentration of carbon dioxide, which also contains water vapor and waste heat. If the waste gas is used for carbon fixation of recycled fine aggregate in concrete, there are many problems that are not conducive to carbonization, such as insufficient carbon dioxide concentration, insufficient water vapor content, and low temperature, resulting in low carbon fixation efficiency. If the carbon dioxide in the waste gas is captured and purified and then put into carbon fixation applications, there are problems of large investment in carbon capture equipment and high capture energy consumption. In addition, there is still the problem of waste gas emissions after one carbon fixation, which still causes carbon dioxide emissions. The recycling of waste gas significantly reduces the carbon dioxide content in the final emitted gas compared to before. Summary of the Invention

[0005] Technical solution: In order to solve the above technical problems, the present invention proposes a method for fixing carbon dioxide by utilizing the drying process of recycled fine aggregate in concrete, making full use of the carbon dioxide in the drying exhaust gas, and recycling the captured carbon dioxide emitted by combustion and re-entering the carbonization process. Moreover, by adjusting the gas flow, temperature and humidity of each link device, the purpose of fast and efficient carbonization of recycled fine aggregate in concrete is achieved, and carbon dioxide is fixed in the process of drying the recycled fine aggregate.

[0006] The present invention specifically provides a system for recycling drying waste gas to carbonize recycled fine aggregate of concrete, including a drying and carbonizing device, a combustion waste gas collection device, a water vapor supply device and a carbonization waste gas collection and recycling device; wherein the drying and carbonizing device is used to dry and carbonize the recycled fine aggregate to be dried and carbonized placed inside, and the generated carbonization waste gas is transported to the carbonization waste gas collection and recycling device, and the generated combustion waste gas is transported to the combustion waste gas collection device; the carbonization waste gas collection and recycling device processes and purifies the carbonization waste gas and then recycles it back to the drying and carbonizing device; the water vapor supply device is used to generate water vapor and transport it to the drying and carbonizing device; the combustion waste gas collection device is used to collect the generated combustion waste gas and then transport it back to the drying and carbonizing device.

[0007] As an improvement, the drying and carbonizing device includes a drying and carbonizing inner cylinder, a rotating motor, and a supporting roller; the drying and carbonizing inner cylinder is a hollow cylinder structure, and the recycled fine aggregate to be dried and carbonized is placed inside; the rotating motor is installed on one side of the drying and carbonizing inner cylinder to provide power for the rotation of the drying and carbonizing inner cylinder; the supporting roller is installed at the bottom of the drying and carbonizing inner cylinder to assist the rotating motor to complete the rotation.

[0008] As an improvement, the drying and carbonizing device further includes combustible fuel and a fuel combustion assembly; the combustible fuel is transported and ignited through the fuel combustion assembly, and the burning flame is at the bottom of the drying and carbonizing inner cylinder to heat the drying and carbonizing inner cylinder.

[0009] As an improvement, the fuel combustion component can adjust the flow rate of combustible fuel, which is 2-6g / min; the outer surface temperature of the drying and carbonizing inner cylinder is 60-350°C, and the rotation speed is 15-60 rpm.

[0010] As an improvement, the water vapor providing device includes a water vapor delivery pipe and a water vapor generator; the water vapor generator is used to generate water vapor, and one end of the water vapor delivery pipe is connected to the water vapor generator outlet, and the other end is connected to the drying carbonization inner cylinder.

[0011] As an improvement, the combustion waste gas collection device includes a waste gas collection outer cylinder, a combustion waste gas collector and a motor, and a combustion waste gas delivery pipeline; the waste gas collection outer cylinder cover is arranged on the outside of the carbonization and drying device, the top is provided with a combustion waste gas collector and a motor, and one side is a combustion waste gas delivery pipeline; the combustion waste gas collector and the motor are used to absorb and collect the waste gas generated by the motor drive; one end of the combustion waste gas delivery pipeline is connected to the waste gas collection outer cylinder, and the other end is connected to the drying and carbonization inner cylinder.

[0012] As an improvement, the carbonization waste gas collection and recycling device includes a carbonization waste gas exhaust pipe, a carbon dioxide absorption tank, a carbon dioxide release tank, and a carbon dioxide release delivery pipe; one end of the carbonization waste gas exhaust pipe is connected to the drying carbonization inner cylinder, and the other end is connected to the carbon dioxide absorption tank; the carbon dioxide absorption tank is used to absorb the carbon dioxide discharged from the carbonization waste gas exhaust pipe; the carbon dioxide release tank is connected to the carbon dioxide absorption tank, and is used to release the carbon dioxide absorbed by the carbon dioxide absorption tank, and is connected to the drying carbonization inner cylinder through the carbon dioxide release delivery pipe.

[0013] As an improvement, the carbonization waste gas collection and recycling device also includes a heating device, which is placed at the bottom of the carbon dioxide release pool.

[0014] As an improvement, an organic amine liquid is placed inside the carbon dioxide absorption tank to absorb carbon dioxide; the heating device is used to heat the organic amine that has absorbed carbon dioxide, so that the carbon dioxide is released and enters the carbon dioxide release pipe.

[0015] As a specific embodiment of the present invention, the present invention also provides a method for recycling the drying waste gas to carbonize concrete to regenerate fine aggregate, the specific steps of which are:

[0016] (1) Pretreatment before work

[0017] Concrete recycled fine aggregate of a certain diameter is placed in a drying and carbonizing inner cylinder. By adjusting the fuel combustion component connected to the combustible fuel, the combustible fuel is made to have a suitable gas flow rate, the outer surface temperature of the drying and carbonizing inner cylinder is adjusted to a suitable temperature, and the motor speed is adjusted to a suitable speed; the water vapor generator is adjusted to obtain water vapor with a suitable relative humidity.

[0018] (2) Drying carbonization and circulation reaction

[0019] Turn on the motor to rotate, ignite the combustible fuel, and transport water vapor to start working inside the drying carbonization inner cylinder. The gas generated in the cylinder enters the carbon dioxide absorption pool through the carbonization waste gas exhaust pipe, absorbs carbon dioxide through the organic amine placed inside the carbon dioxide absorption pool, and then enters the carbon dioxide release pool. It is heated by the heating device to release carbon dioxide, and the carbon dioxide enters the drying carbonization inner cylinder through the carbon dioxide release pipe; the waste gas collected by the waste gas collection outer cylinder is collected by the combustion waste gas collector and the motor at the top, and then enters the drying carbonization inner cylinder through the combustion waste gas delivery pipeline; repeat the cycle process of step (two) to make full use of the carbon dioxide in the combustion waste gas.

[0020] (3) Material collection

[0021] After the drying and carbonization process is complete, the combustible fuel valve can be closed to stop combustion, the rotary motor can be turned off to stop the rotation of the drying and carbonization inner drum, and the steam generator can be turned off to stop the steam transmission. After the system has completely stopped operating, the rotary motor can be adjusted to reverse the drying and carbonization inner drum, pour out the carbonized recycled fine aggregate in the inner drum, collect and add recycled concrete fine aggregate to prepare for the next drying and carbonization process.

[0022] Beneficial effects: Compared with the existing conventional system, the system proposed by the present invention has the following advantages:

[0023] (1) The performance of recycled concrete aggregate after carbonization has been improved to a certain extent, including crushing index and strength. The stability of construction products produced by recycled aggregate after carbonization has also been improved. After carbonization, the crushing value of recycled aggregate with a particle size of 2.36-4.75mm is reduced by 22%. After drying and carbonization, the water absorption rate of recycled fine aggregate of 0.3-0.6mm can be reduced by 28%. The strength of mortar cast with recycled concrete fine aggregate after carbonization can be increased by up to 70%; (2) The waste gas in the system is reused through the circulation device, CO2 is recycled, and no CO2 is emitted, realizing green production in the true sense. (3) Recycled concrete aggregate is used for carbon fixation and green production, realizing the implementation of the dual carbon policy in the construction industry. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a structural schematic diagram of the present invention.

[0025] In the figure: 1. Drying and carbonizing inner cylinder; 2. Rotating motor; 3. Support roller; 4. Combustible fuel; 5. Fuel combustion assembly; 6. Combustion waste gas collection outer cylinder; 7 Combustion waste gas collector and motor; 8. Combustion waste gas conveying pipeline; 9. Water vapor conveying pipe 10. Water vapor generator; 11. Carbonization residual gas discharge pipe; 12. Carbon dioxide absorption tank; 13. Carbon dioxide release tank; 14. Carbon dioxide release tank heating device; 15. Carbon dioxide release conveying pipe; 16. Recycled fine aggregate to be dried and carbonized. DETAILED DESCRIPTION

[0026] The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0027] See Figure 1 As shown, the system of the present invention mainly consists of a drying and carbonizing device, a combustion waste gas collecting device, a water vapor providing device and a carbonization waste gas collecting and recycling device.

[0028] The carbonization and drying device includes a drying and carbonization inner cylinder 1; a rotating motor 2; a supporting roller 3; a combustible fuel 4, which can be gas; and a fuel combustion component 5, which can select a gas burner to complete the combustion of the combustible fuel.

[0029] Specifically, the drying and carbonizing inner cylinder 1 continuously rotates under the drive of the rotating motor 2 and the support of the supporting rollers 3, thereby causing the recycled fine aggregate 16 to be dried and carbonized inside to be turned over. Furthermore, gas is connected to a gas burner to emit a flame, heating the drying and carbonizing inner cylinder 1 and drying the recycled fine aggregate 16 to be dried and carbonized inside. The gas burner can adjust the flame size to achieve a temperature variation of the outer surface of the drying and carbonizing inner cylinder 1 between 60 degrees Celsius and 350 degrees Celsius. The driving motor speed is adjustable, allowing the rotation speed of the drying and carbonizing inner cylinder 1 to vary between 15 rpm and 60 rpm, and achieving reverse discharge.

[0030] The exhaust gas collection device includes an exhaust gas collection outer cylinder 6, an exhaust gas collector and motor 7, and an exhaust gas delivery pipeline 8. The exhaust gas is collected by the exhaust gas collector and motor 7, located at the top of the exhaust gas collection outer cylinder 6, and then transported through the exhaust gas delivery pipeline 8 to the interior of the drying and carbonization inner cylinder 1. Under the influence of high carbon dioxide concentration and high temperature, the recycled fine aggregate 16 to be dried and carbonized undergoes a rapid carbonization reaction, thereby fixing the carbon dioxide. The exhaust gas collector and motor 7 are adjustable in speed to achieve a carbon dioxide concentration in the exhaust gas of 2% to 13% (the exhaust gas collection rate is adjusted by adjusting the motor speed).

[0031] The water vapor supply device includes a water vapor delivery pipe 9 and a water vapor generator 10. Since the carbonization reaction requires the participation of water vapor, if the recycled fine aggregate 16 to be dried and carbonized is dried quickly, the carbonization reaction will slow down. In order to adjust and improve the carbonization efficiency, a water vapor supply device is added. The water vapor is provided by the water vapor generator 10 and transported to the interior of the drying and carbonization inner cylinder 1 through the water vapor delivery pipe 9. The water vapor concentration and flow rate are adjustable, and can be set to a concentration of 40g / m 3 , flow rate 4-20m / min, flow rate 2-10L / min.

[0032] The carbonization waste gas collection and recycling device includes a carbonization waste gas discharge pipe 11; a carbon dioxide absorption tank 12; a carbon dioxide release tank 13; a heating device 14; and a carbon dioxide release pipe 15. The recycled fine aggregate 16 to be dried and carbonized within the drying and carbonization inner cylinder 1 cannot react with all of the carbon dioxide 8 introduced. Instead, the carbonization waste gas is discharged from the carbonization waste gas discharge pipe 11 into the carbon dioxide absorption tank 12. The carbon dioxide absorption tank 12 contains an organic amine liquid that absorbs carbon dioxide. The absorbed organic amine then flows into the carbon dioxide release tank 13. A heating device 14 is located at the bottom of the carbon dioxide release tank 13. The carbon dioxide released by the organic amine upon heating is transported back into the drying and carbonization inner cylinder 1 through the carbon dioxide release pipe 15, where it continues to react with the recycled fine aggregate 16 to be dried and carbonized.

[0033] The system and method of the present invention are described and introduced in detail below through specific embodiments.

[0034] Example 1:

[0035] By adjusting the gas flow rate to 1.5 L / min and the gas burner to a low flame, the outer surface temperature of the drying and carbonizing inner drum reached 60°C. The exhaust gas collection device motor speed was adjusted to 20 rpm, the gas flow rate to 15 L / min, the carbon dioxide concentration to 2%, the steam generator relative humidity to 92%, and the drying and carbonizing inner drum speed to 15 rpm. Carbonization of recycled fine aggregate under 4.75 mm in size after 30, 60, 90, and 120 minutes, respectively, showed carbonization degrees of 19%, 52%, 78%, and 89%, and reduced water absorption by 3.7%, 17.1%, 19.8%, and 22.3%, respectively.

[0036] Example 2:

[0037] By adjusting the gas flow rate to 1.2 L / min and the gas burner to a low flame, the outer surface temperature of the drying and carbonizing inner drum reached 50°C. The exhaust gas collection device motor speed was adjusted to 10 rpm, the gas flow rate to 7 L / min, the carbon dioxide concentration to 5%, the steam generator to 92% relative humidity, and the drying and carbonizing inner drum speed to 15 rpm. Carbonization of recycled fine aggregate under 4.75 mm in size after 30, 60, 90, and 120 minutes, respectively, showed carbonization degrees of 42%, 72%, 83%, and 92%, and reduced water absorption by 15.2%, 19.7%, 23.8%, and 25.7%, respectively.

[0038] Example 3:

[0039] By adjusting the gas flow rate to 1.8 L / min, the gas burner reached a flame, the outer surface temperature of the drying and carbonizing inner drum reached 150°C, the exhaust gas collection device motor speed was adjusted to 10 rpm, the gas flow rate was 7 L / min, the carbon dioxide concentration was 5%, the steam generator was adjusted to a relative humidity of 94%, and the drying and carbonizing inner drum speed was 15 rpm. Carbonation of recycled fine aggregate under 4.75 mm in size after 30, 60, 90, and 120 minutes, respectively, showed carbonization degrees of 32%, 41%, 44%, and 46%, and water absorption rates decreased by 11.2%, 13.9%, 14.4%, and 14.5%, respectively.

[0040] Example 4:

[0041] By adjusting the gas flow rate to 2.2 L / min to ignite the gas burner, the outer surface temperature of the drying and carbonizing inner drum reached 250°C. The exhaust gas collection device motor speed was adjusted to 8 rpm, the gas flow rate to 5 L / min, the carbon dioxide concentration to 8%, the steam generator to 95% relative humidity, and the drying and carbonizing inner drum speed to 35 rpm. Carbonization of recycled fine aggregate under 4.75 mm in size after 30, 60, 90, and 120 minutes of carbonization resulted in carbonization degrees of 19%, 21%, 22%, and 23%, respectively. Water absorption rates were reduced by 6.9%, 7.0%, 7.1%, and 7.1%, respectively.

[0042] Example 5:

[0043] By adjusting the gas flow rate to 2.5 L / min and the gas burner to a flaming state, the outer surface temperature of the drying and carbonizing inner drum reached 350°C. The exhaust gas collection device motor speed was adjusted to 6 rpm, the gas flow rate was 4 L / min, the carbon dioxide concentration was 13%, the steam generator was adjusted to a relative humidity of 96%, and the drying and carbonizing inner drum speed was 60 rpm. Carbonation of recycled fine aggregate under 4.75 mm in size after 30, 60, 90, and 120 minutes of carbonization resulted in carbonization degrees of 17%, 19%, 20%, and 21%, respectively. Water absorption rates were reduced by 5.7%, 6.8%, 7.1%, and 7.0%, respectively.

[0044] Example 6:

[0045] By adjusting the gas flow rate to 1.6 L / min, the gas burner to a low flame, and the outer surface temperature of the drying and carbonizing inner drum to 100°C, the exhaust gas collection device motor speed was adjusted to 10 rpm, the gas flow rate to 8 L / min, the carbon dioxide concentration to 6%, the steam generator to 94% relative humidity, and the drying and carbonizing inner drum speed to 60 rpm, the carbonization degree of recycled fine aggregate of concrete under 4.75 mm after carbonization for 30, 60, 90, and 120 minutes was 51%, 79%, 87%, and 94%, respectively, and the water absorption rate decreased by 14.9%, 21.1%, 25.4%, and 29.1%, respectively.

[0046] The above-described embodiments merely illustrate several implementations of the present invention, and while their descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the patent for this invention shall be determined by the appended claims.

Claims

1. A system for recycling fine aggregate from carbonized concrete using drying waste gas, characterized by: It comprises a drying and carbonizing device, a combustion waste gas collecting device, a water vapor supply device and a carbonization waste gas collecting and recycling device; wherein the drying and carbonizing device is used to dry and carbonize the recycled fine aggregate (16) to be dried and carbonized placed inside, the generated carbonization waste gas is transported to the carbonization waste gas collecting and recycling device, and the generated combustion waste gas is transported to the combustion waste gas collecting device; the combustion waste gas collecting device is used to collect the generated combustion waste gas and then transport it back to the drying and carbonizing device; the water vapor supply device is used to generate water vapor and transport it to the drying and carbonizing device; the carbonization waste gas collecting and recycling device processes the carbonization waste gas and then circulates it back to the drying and carbonizing device; The water vapor supply device comprises a water vapor delivery pipe (9) and a water vapor generator (10); the water vapor generator (10) is used to generate water vapor, and one end of the water vapor delivery pipe (9) is connected to the outlet of the water vapor generator (10), and the other end is connected to the drying carbonization inner cylinder (1); The carbonization waste gas collection and recycling device comprises a carbonization waste gas discharge pipe (11), a carbon dioxide absorption pool (12), a carbon dioxide release pool (13), and a carbon dioxide release delivery pipe (15); one end of the carbonization waste gas discharge pipe (11) is connected to the drying carbonization inner cylinder (1), and the other end is connected to the carbon dioxide absorption pool (12); the carbon dioxide absorption pool (12) is used to absorb carbon dioxide discharged from the carbonization waste gas discharge pipe (11); the carbon dioxide release pool (13) is connected to the carbon dioxide absorption pool (12) and is used to release the carbon dioxide absorbed by the carbon dioxide absorption pool (12) and is connected to the drying carbonization inner cylinder (1) through the carbon dioxide release delivery pipe (15); The carbonized waste gas collection and recycling device further comprises a heating device (14), wherein the heating device (14) is placed at the bottom of the carbon dioxide release pool (13); An organic amine is placed inside the carbon dioxide absorption pool (12) for capturing carbon dioxide; the heating device (14) is used to heat the organic amine pool after capturing carbon dioxide, so that carbon dioxide is released and enters the carbon dioxide release delivery pipe (15).

2. The system for recycling fine aggregate from carbonized concrete using drying waste gas according to claim 1, characterized in that: The drying and carbonizing device comprises a drying and carbonizing inner cylinder (1), a rotating motor (2), and a supporting roller (3); the drying and carbonizing inner cylinder (1) is a hollow cylinder structure, and recycled fine aggregate (16) to be dried and carbonized is placed inside; the rotating motor (2) is installed on one side of the drying and carbonizing inner cylinder (1) to provide power for the rotation of the drying and carbonizing inner cylinder (1); the supporting roller (3) is installed at the bottom of the drying and carbonizing inner cylinder (1) to assist the rotating motor (2) in completing the rotation.

3. The system for recycling fine aggregate from carbonized concrete using drying waste gas according to claim 2, characterized in that: The drying and carbonizing device further comprises a combustible fuel (4) and a fuel combustion assembly (5); the combustible fuel (4) is transported through the fuel combustion assembly (5) and ignited at the outer bottom of the drying and carbonizing inner cylinder (1) to heat the drying and carbonizing inner cylinder (1) and simultaneously generate exhaust gas containing CO2.

4. The system for recycling fine aggregate from carbonized concrete using drying waste gas according to claim 3 is characterized in that: The fuel combustion component (5) is capable of adjusting the flow rate of the combustible fuel (4), and the flow rate is 2-6 g / min.

5. The system for recycling fine aggregate from carbonized concrete using drying waste gas according to claim 1, characterized in that: The combustion waste gas collection device comprises a waste gas collection outer cylinder (6), a combustion waste gas collector and a motor (7), and a combustion waste gas delivery pipeline (8); the waste gas collection outer cylinder (6) is covered and arranged outside the carbonization and drying device, the top of which is connected to the combustion waste gas collector and the motor (7), and one side is the combustion waste gas delivery pipeline (8); the combustion waste gas collector and the motor (7) are used to absorb and collect the waste gas generated by the motor drive; one end of the combustion waste gas delivery pipeline (8) is connected to the waste gas collection outer cylinder (6), and the other end is connected to the drying and carbonization inner cylinder (1).

6. A method for recycling fine aggregate from carbonized concrete using drying waste gas according to any one of claims 1 to 5, characterized in that: The specific steps are: (1) Pretreatment before work Concrete recycled fine aggregate of a certain diameter is placed in a drying carbonization inner cylinder (1), and the combustible fuel (4) is connected to a fuel combustion component (5) so that the combustible fuel (4) is fed to a suitable gas flow rate, the outer surface temperature of the drying carbonization inner cylinder is adjusted to a suitable temperature, and the motor speed is adjusted to a suitable speed; the water vapor generator (10) is adjusted to obtain water vapor with a suitable relative humidity; (2) Drying carbonization and cyclic reaction The combustible fuel (4) valve is opened, the fuel is ignited, the rotating motor (2) is turned on to rotate the drying carbonization inner cylinder (1), the water vapor generator (10) is turned on to transport water vapor, and the drying carbonization inner cylinder (1) starts to work. The gas generated in the cylinder enters the carbon dioxide absorption pool (12) through the carbonization waste gas discharge pipe (11), absorbs carbon dioxide through the organic amine placed inside the carbon dioxide absorption pool (12), and then enters the carbon dioxide release pool (13), is heated by the heating device (14) to release carbon dioxide, and the carbon dioxide enters the drying carbonization inner cylinder (1) through the carbon dioxide release delivery pipe (15); the waste gas collected by the waste gas collection outer cylinder (6) is collected by the combustion waste gas collector and the motor (7) at the top, and then enters the drying carbonization inner cylinder (1) through the combustion waste gas delivery pipe (8); the cycle process of step (ii) is repeated, wherein the carbon dioxide content in the generated combustion waste gas is 5-13%, and the adjustable concentration of carbon dioxide in the combustion waste gas after treatment by the combustion waste gas collector and the motor (7) is 2-13%; (3) Material collection After the drying and carbonization is completed, the valve of the combustible fuel (4) can be closed to stop the combustion, the rotating motor (2) can be turned off to stop the rotation of the drying and carbonization inner cylinder (1), and the water vapor generator (12) can be turned off to stop the transmission of water vapor; after the system completely stops operating, the rotating motor (2) is adjusted to reverse the drying and carbonization inner cylinder (1), pour out the carbonized recycled fine aggregate in the inner cylinder, collect and re-add the recycled fine aggregate of concrete to prepare for the next drying and carbonization.

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