CN116447840A - System and method for recycling and carbonizing concrete recycled fine aggregate by using drying waste gas - Google Patents
System and method for recycling and carbonizing concrete recycled fine aggregate by using drying waste gas Download PDFInfo
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- CN116447840A CN116447840A CN202310109890.9A CN202310109890A CN116447840A CN 116447840 A CN116447840 A CN 116447840A CN 202310109890 A CN202310109890 A CN 202310109890A CN 116447840 A CN116447840 A CN 116447840A
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- 239000002912 waste gas Substances 0.000 title claims abstract description 117
- 238000001035 drying Methods 0.000 title claims abstract description 109
- 238000010000 carbonizing Methods 0.000 title claims abstract description 49
- 238000004064 recycling Methods 0.000 title claims abstract description 31
- 238000000034 method Methods 0.000 title claims abstract description 13
- 238000003763 carbonization Methods 0.000 claims abstract description 102
- 238000002485 combustion reaction Methods 0.000 claims abstract description 72
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 30
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims description 178
- 229910002092 carbon dioxide Inorganic materials 0.000 claims description 89
- 239000001569 carbon dioxide Substances 0.000 claims description 89
- 239000007789 gas Substances 0.000 claims description 56
- 238000010521 absorption reaction Methods 0.000 claims description 28
- 239000000446 fuel Substances 0.000 claims description 28
- 230000001105 regulatory effect Effects 0.000 claims description 23
- 238000010438 heat treatment Methods 0.000 claims description 18
- 150000001412 amines Chemical class 0.000 claims description 9
- 238000006243 chemical reaction Methods 0.000 claims description 6
- 230000008569 process Effects 0.000 claims description 3
- 230000005540 biological transmission Effects 0.000 claims description 2
- 125000004122 cyclic group Chemical group 0.000 claims description 2
- 239000000463 material Substances 0.000 claims description 2
- 229910052799 carbon Inorganic materials 0.000 abstract description 12
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract description 9
- 238000004519 manufacturing process Methods 0.000 abstract description 7
- 239000002699 waste material Substances 0.000 abstract 1
- 230000006872 improvement Effects 0.000 description 10
- 230000008901 benefit Effects 0.000 description 4
- 239000004566 building material Substances 0.000 description 2
- 239000002803 fossil fuel Substances 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 239000004570 mortar (masonry) Substances 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000002737 fuel gas Substances 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 230000010220 ion permeability Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 230000007306 turnover Effects 0.000 description 1
- 239000002918 waste heat Substances 0.000 description 1
Classifications
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
- C04B20/02—Treatment
- C04B20/04—Heat treatment
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
- C04B20/02—Treatment
- C04B20/023—Chemical treatment
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B11/00—Machines or apparatus for drying solid materials or objects with movement which is non-progressive
- F26B11/02—Machines or apparatus for drying solid materials or objects with movement which is non-progressive in moving drums or other mainly-closed receptacles
- F26B11/04—Machines or apparatus for drying solid materials or objects with movement which is non-progressive in moving drums or other mainly-closed receptacles rotating about a horizontal or slightly-inclined axis
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
- F26B21/14—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects using gases or vapours other than air or steam, e.g. inert gases
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B23/00—Heating arrangements
- F26B23/02—Heating arrangements using combustion heating
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B25/00—Details of general application not covered by group F26B21/00 or F26B23/00
- F26B25/06—Chambers, containers, or receptacles
- F26B25/14—Chambers, containers, receptacles of simple construction
- F26B25/16—Chambers, containers, receptacles of simple construction mainly closed, e.g. drum
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Combustion & Propulsion (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Drying Of Solid Materials (AREA)
Abstract
The invention provides a system for recycling recycled concrete recycled fine aggregate by using dried waste gas, which comprises a drying and carbonizing device, a combustion waste gas collecting device, a water vapor providing device and a carbonized waste gas collecting and recycling device; the drying carbonization device is used for drying and carbonizing regenerated fine aggregate placed in the device to be dried and carbonized, and conveying generated carbonized waste gasSending the waste gas to a carbonization waste gas collecting and recycling device, and sending generated combustion waste gas to the combustion waste gas collecting device; the carbonization waste gas collecting and recycling device is used for treating the carbonization waste gas and then circularly conveying the carbonized waste gas back to the drying and carbonization device; a water vapor supply device for generating water vapor; and the combustion waste gas collecting device is used for collecting generated combustion waste gas and then conveying the generated combustion waste gas back to the drying and carbonizing device. In addition, the method of the system can carry out carbon fixation, green production, and reuse of waste gas generated by the system and recycle of CO 2 No CO emission 2 Realizing the real green production and realizing the implementation of the building industry on the double-carbon policy.
Description
Technical Field
The invention belongs to the technical field of carbon fixation of concrete recycled fine aggregate, in particular to equipment and a method for circularly collecting carbon dioxide in drying waste gas and fixing carbon dioxide in a drying process of recycled concrete fine aggregate, and particularly relates to a system and a method for circularly utilizing the drying waste gas to carbonize the concrete recycled fine aggregate.
Background
From the last century, the global climate has changed significantly as industrialization progresses and the global population has exploded. Taking the atmospheric temperature as an example, the global air temperature has risen by 0.5 ℃ from 1970 to 2012. If the trend of the current air temperature rise is maintained, the global air temperature can rise by 1.4-5.8 ℃ on the basis of 2012 by the end of the century. And CO in particular to the atmosphere 2 The concentration of fossil fuels is increased along with the great use of the fossil fuels, if the CO in the global scope is not controlled 2 Gas emission, CO in the atmosphere by the end of this century 2 The concentration may reach 1964mg/m 3 . To cope with CO in the atmosphere 2 The greenhouse effect caused by continuous accumulation causes a series of environmental problems, and along with the proposal of the double-carbon concept, besides energy conservation and emission reduction, carbon fixation becomes a hot research of various industries.
CO in conventional industrial production processes 2 The air is directly discharged to the atmosphere, and the air is well sealed for a short period of time. In the building material industry, some researchers have been able to treat CO emitted during industrial processes 2 Purifying after capturing, then putting into a new building material production process for recycling instead of simply sealing,or directly discharged, good ecological benefits can be generated firstly; next CO is carried out 2 The carbonized regenerated aggregate has the advantages of improved performance, reduced water absorption, improved apparent density, reduced crushing index, improved compressive strength, obviously improved durability, reduced chloride ion permeability and obviously improved carbonization resistance. Therefore, the recycled aggregate processed by the system can also generate better economic benefit in subsequent building production.
However, there is a problem that when the recycled concrete fine aggregate is used as a raw material of the dry powder mortar, the recycled concrete fine aggregate needs to be dried and graded, natural gas is often used for heating in the drying process, a large amount of carbon dioxide is generated, and the waste gas is directly discharged into the atmosphere by a traditional drying system. The exhaust gas has a high carbon dioxide concentration and also contains water vapor and waste heat. If the waste gas is used for carrying out carbon fixation on the concrete recycled fine aggregate, the problems of insufficient carbon dioxide concentration, insufficient water vapor content, low temperature and the like which are unfavorable for carbonization exist, so that the carbon fixation efficiency is low. If the carbon dioxide in the exhaust gas is collected and purified and then put into a carbon fixation application, there are problems that the carbon collection equipment is put into large and the collection energy consumption is high. In addition, the problem of exhaust gas emission still exists after primary carbon fixation, and carbon dioxide emission still occurs. The waste gas is recycled, so that the carbon dioxide content in the finally discharged gas is obviously reduced compared with the prior art.
Disclosure of Invention
The technical scheme is as follows: in order to solve the technical problems, the invention provides a method for fixing carbon dioxide by utilizing the drying process of the recycled concrete fine aggregate, which fully utilizes carbon dioxide in the drying waste gas, circularly captures the carbon dioxide discharged by combustion, and inputs the carbon dioxide into the carbonization process again.
The invention particularly provides a system for recycling and carbonizing concrete recycled fine aggregate by using drying waste gas, which comprises a drying and carbonizing device, a combustion waste gas collecting device, a water vapor providing device and a carbonized waste gas collecting and recycling device; the device comprises a drying carbonization device, a carbonization waste gas collecting and recycling device, a combustion waste gas collecting device and a carbonization waste gas collecting device, wherein the drying carbonization device is used for drying and carbonizing regenerated fine aggregate to be dried and carbonized in the device; the carbonization waste gas collecting and recycling device is used for treating and purifying the carbonization waste gas and then circularly conveying the carbonized waste gas back to the drying and carbonizing device; the steam supply device is used for generating steam and conveying the steam to the drying and carbonizing device; the combustion waste gas collecting device is used for collecting generated combustion waste gas and then conveying the generated combustion waste gas back to the drying and carbonizing device.
As an improvement, the drying and carbonizing device comprises a drying and carbonizing inner cylinder, a rotating motor and a supporting roller; the drying carbonization inner cylinder is of a hollow cylinder structure, and regenerated fine aggregate to be dried and carbonized is placed in the drying carbonization inner cylinder; the rotary motor is arranged on one side of the drying and carbonizing inner cylinder and provides power for the rotation of the drying and carbonizing inner cylinder; the supporting roller is arranged at the bottom of the drying carbonization inner cylinder, and the auxiliary rotating motor is used for completing rotation.
As an improvement, the drying and carbonizing device also comprises a combustible fuel and fuel combustion assembly; the combustible fuel is conveyed and ignited by the fuel combustion assembly, and the burning flame is arranged at the bottom of the drying and carbonizing inner cylinder and is used for heating the drying and carbonizing inner cylinder.
As an improvement, wherein the fuel combustion assembly is capable of regulating the flow of combustible fuel at a flow rate of 2-6g/min; the temperature of the outer surface of the drying carbonization inner cylinder is 60-350 ℃, and the rotation speed is 15-60 revolutions per minute.
As an improvement, the water vapor supply device comprises a water vapor delivery pipe and a water vapor generator; the steam generator is used for generating steam, one end of the steam conveying pipe is communicated with the outlet of the steam generator, and the other end of the steam conveying pipe is communicated with the drying carbonization inner cylinder.
As an improvement, the combustion exhaust gas collecting device comprises an exhaust gas collecting outer cylinder, a combustion exhaust gas collector, a motor and a combustion exhaust gas conveying pipeline; the exhaust gas collecting outer cylinder is covered outside the carbonization drying device, the top is provided with a combustion exhaust gas collector and a motor, and one side of the exhaust gas collecting outer cylinder is provided with a combustion exhaust gas conveying pipeline; the combustion waste gas collector and the motor are used for absorbing and collecting generated waste gas through motor driving; and one end of the combustion waste gas conveying pipeline is communicated with the waste gas collecting outer cylinder, and the other end of the combustion waste gas conveying pipeline is communicated with the drying carbonization inner cylinder.
As an improvement, the carbonization waste gas collecting and recycling device comprises a carbonization waste gas discharge pipe, a carbon dioxide absorption tank, a carbon dioxide release tank and a carbon dioxide release conveying pipe; one end of the carbonized waste gas discharge pipe is communicated with the drying carbonized inner cylinder, and the other end of the carbonized waste gas discharge pipe is communicated with the carbon dioxide absorption tank; the carbon dioxide absorption tank is used for absorbing carbon dioxide discharged by the carbonized waste gas discharge pipe; the carbon dioxide release pool is communicated with the carbon dioxide absorption pool and is used for releasing carbon dioxide absorbed by the carbon dioxide absorption pool and is communicated to the drying carbonization inner cylinder through a carbon dioxide release conveying pipe.
As an improvement, the carbonization waste gas collecting and recycling device also comprises a heating device, wherein the heating device is arranged at the bottom of the carbon dioxide releasing pond.
As an improvement, an organic amine liquid is placed in the carbon dioxide absorption tank and is used for absorbing carbon dioxide; the heating device is used for heating the organic amine absorbed with the carbon dioxide so as to release the carbon dioxide and enter the carbon dioxide release delivery pipe.
As a specific embodiment of the invention, the invention also provides a method for recycling the system for carbonizing concrete recycled fine aggregate by using the drying waste gas, which comprises the following specific steps:
first pre-job pretreatment
Placing concrete recycled fine aggregate with a certain diameter in a drying carbonization inner cylinder, enabling the combustible fuel to be proper gas flow through adjusting a fuel combustion assembly communicated with the combustible fuel, adjusting the temperature of the outer surface of the drying carbonization inner cylinder to be proper temperature, and enabling the rotating speed of a motor to be proper; the water vapor generator is regulated to obtain water vapor with proper relative humidity.
(II) drying carbonization and cyclic reaction
Starting a motor to rotate, igniting combustible fuel, conveying water vapor, enabling the inside of the drying carbonization inner cylinder to start working, enabling gas generated in the cylinder to enter a carbon dioxide absorption tank through a carbonization waste gas discharge pipe, absorbing carbon dioxide through organic amine placed in the carbon dioxide absorption tank, entering a carbon dioxide release tank, heating by a heating device to release carbon dioxide, and enabling the carbon dioxide to enter the drying carbonization inner cylinder through a carbon dioxide release conveying pipe; the waste gas collected by the waste gas collecting outer cylinder is collected by a combustion waste gas collector at the top and a motor and then enters the drying carbonization inner cylinder through a combustion waste gas conveying pipeline; and (3) repeating the circulation process of the step (II), so that the carbon dioxide in the combustion exhaust gas is fully utilized.
(III) taking materials
After the drying carbonization is finished, the valve of the combustible fuel can be closed to stop burning, the rotating motor is closed to stop the rotation of the drying carbonization inner cylinder, and the steam generator is closed to stop the transmission of steam. And after the system completely stops running, the rotating motor is regulated to enable the drying carbonization inner cylinder to rotate reversely, the carbonized regenerated fine aggregate in the inner cylinder is poured out, and the recycled fine aggregate of concrete is collected and re-added to prepare for next drying carbonization.
The beneficial effects are that: compared with the prior conventional system, the system provided by the invention has the following advantages:
(1) The carbonized recycled concrete aggregate has a certain improvement in performance, including crushing index, strength and the like, and the building products produced by the carbonized recycled aggregate have an improvement in stability. The crushing value of the recycled aggregate with the grain diameter of 2.36-4.75mm is reduced by 22% after carbonization, the water absorption rate of the recycled aggregate with the grain diameter of 0.3-0.6mm can be reduced by 28% after drying and carbonization treatment, and the strength of mortar poured by the recycled concrete aggregate after carbonization can be improved by 70% at maximum; (2) Waste gas in the system is reused through the circulating device, and CO is recycled 2 No CO emission 2 Realizing the real green production. (3) The recycled concrete aggregate is utilized for carbon fixation, green production is realized, and implementation of the building industry on a double-carbon policy is realized.
Drawings
Fig. 1 is a schematic structural view of the present invention.
In the figure: 1. drying and carbonizing the inner cylinder; 2. a rotating motor; 3. supporting rollers; 4. a combustible fuel; 5. a fuel combustion assembly; 6. a combustion exhaust gas collecting outer cylinder; 7, a combustion waste gas collector and a motor; 8. a combustion exhaust gas delivery conduit; 9. a steam delivery pipe 10. A steam generator; 11. a carbonized residual air discharge pipe; 12. a carbon dioxide absorption tank; 13. a carbon dioxide release tank; 14. a carbon dioxide release tank heating device; 15. releasing a carbon dioxide delivery tube; 16. and (5) drying and carbonizing the regenerated fine aggregate.
Detailed Description
The following describes the embodiments of the present invention in further detail with reference to examples. The following examples are illustrative of the invention and are not intended to limit the scope of the invention.
As shown in FIG. 1, the system of the invention mainly comprises a drying and carbonizing device, a combustion waste gas collecting device, a water vapor providing device and a carbonizing waste gas collecting and recycling device.
The carbonization drying device comprises a drying carbonization inner cylinder 1; a rotary motor 2; a support roller 3; the combustible fuel 4 can be fuel gas; the fuel combustion assembly 5 can select a gas burner to complete the combustion of the combustible fuel.
Specifically: the drying carbonization inner cylinder 1 is driven by the rotating motor 2 and is supported by the supporting roller 3 to continuously rotate, so that the regenerated fine aggregate 16 of which the inside is to be dried and carbonized can be driven to turn over. Further, the gas is connected to the gas burner to burn out flame, heat the drying and carbonizing inner cylinder 1, and dry the regenerated fine aggregate 16 to be dried and carbonized in the drying and carbonizing inner cylinder. The gas burner can adjust the flame size to realize the change of the outer surface temperature of the drying carbonization inner cylinder 1 from 60 ℃ to 350 ℃. The rotation speed of the driving motor is adjustable, so that the rotation speed of the drying carbonization inner cylinder 1 can be changed within 15-60 revolutions per minute, and the reverse discharging is realized.
The combustion exhaust gas collecting device comprises an exhaust gas collecting outer cylinder 6, a combustion exhaust gas collector and a motor 7, and a combustion exhaust gas conveying pipeline 8. The combustion waste gas is collected by a combustion waste gas collector and a motor 7 arranged at the top of the combustion waste gas collecting outer cylinder 6 and is conveyed to the inside of the drying carbonization inner cylinder 1 through a combustion waste gas conveying pipeline 8, and under the action of high carbon dioxide concentration and high temperature, the regenerated fine aggregate 16 to be dried and carbonized is subjected to rapid carbonization reaction, so that carbon dioxide is fixed. The combustion waste gas collector and the motor rotating speed 7 can be adjusted, so that the concentration of carbon dioxide in the combustion waste gas is 2% -13% (the rate of collecting the waste gas is changed by adjusting the motor rotating speed).
The steam supply device comprises a steam conveying pipe 9 and a steam generator 10, and because the carbonization reaction needs the participation of steam, if the regenerated fine aggregate 16 to be dried and carbonized is dried quickly, the carbonization reaction is retarded, and in order to adjust and improve the carbonization efficiency, the steam supply device is added, the steam generator 10 supplies steam, and the steam is conveyed into the interior of the drying and carbonization inner cylinder 1 through the steam conveying pipe 9. The concentration and flow rate of the water vapor can be adjusted, and can be specifically set to be 40g/m 3 The flow rate is 4-20m/min, and the flow rate is 2-10L/min.
The carbonized waste gas collecting and recycling device comprises a carbonized waste gas discharge pipe 11; a carbon dioxide absorption cell 12; a carbon dioxide release tank 13; a heating device 14; releasing the carbon dioxide delivery tube 15. The regenerated fine aggregate 16 to be dried and carbonized in the drying and carbonization inner cylinder 1 cannot be fully reacted by introducing carbon dioxide 8, carbonized waste gas is discharged from a carbonized waste gas discharge pipe 11 and enters a carbon dioxide absorption tank 12, organic amine liquid is in the carbon dioxide absorption tank 12 and can absorb carbon dioxide, the organic amine absorbing the carbon dioxide flows into a carbon dioxide release tank 13, a heating device 14 is arranged at the bottom of the carbon dioxide release tank 13, the organic amine is heated to release the carbon dioxide, the carbon dioxide is conveyed back to the inside of the drying and carbonization inner cylinder 1 through a released carbon dioxide conveying pipe 15, and carbonization reaction with the regenerated fine aggregate 16 to be dried and carbonized is continued.
The method of the system of the present invention will now be described and illustrated in detail by means of specific examples.
Example 1:
the gas flow is regulated to be 1.5L/min, so that the gas burner is enabled to reach smaller flame, the temperature of the outer surface of the drying carbonization inner cylinder is enabled to reach 60 ℃, the motor rotating speed of the combustion waste gas collecting device is regulated to be 20 revolutions per minute, the gas flow is 15L/min, the carbon dioxide concentration is 2%, and the steam generator is regulated so that the relative humidity of the introduced gas is 92%, and the rotating speed of the drying carbonization inner cylinder is 15 revolutions per minute. Carbonizing the concrete recycled fine aggregate with the grain size of less than 4.75mm for 30, 60, 90 and 120 minutes, wherein the carbonization degree is 19%,52%,78% and 89% respectively; the water absorption is reduced by 3.7%,17.1%,19.8% and 22.3% respectively.
Example 2:
the gas flow is regulated to be 1.2L/min, so that the gas burner is enabled to reach smaller flame, the temperature of the outer surface of the drying carbonization inner cylinder is enabled to reach 50 ℃, the motor rotating speed of the combustion waste gas collecting device is regulated to be 10 revolutions per minute, the gas flow is 7L/min, the carbon dioxide concentration is 5%, and the steam generator is regulated so that the relative humidity of the introduced gas is enabled to reach 92%, and the rotating speed of the drying carbonization inner cylinder is 15 revolutions per minute. Carbonizing the concrete recycled fine aggregate with the grain size of less than 4.75mm for 30, 60, 90 and 120 minutes, wherein the carbonization degree is 42%,72%,83% and 92% respectively; the water absorption is respectively reduced by 15.2%,19.7%,23.8% and 25.7%.
Example 3:
the gas flow is regulated to be 1.8L/min, so that the gas burner is enabled to reach flame, the temperature of the outer surface of the drying carbonization inner cylinder is enabled to reach 150 ℃, the motor rotating speed of the combustion waste gas collecting device is regulated to be 10 revolutions per minute, the gas flow is 7L/min, the carbon dioxide concentration is 5%, and the steam generator is regulated so that the relative humidity of the introduced gas reaches 94%, and the rotating speed of the drying carbonization inner cylinder is 15 revolutions per minute. Carbonizing the concrete recycled fine aggregate with the grain size of less than 4.75mm for 30, 60, 90 and 120 minutes, wherein the carbonization degree is 32%,41%,44% and 46% respectively; the water absorption is reduced by 11.2%,13.9%,14.4% and 14.5% respectively.
Example 4:
the gas flow is regulated to 2.2L/min to enable the gas burner to flame, the temperature of the outer surface of the drying carbonization inner cylinder reaches 250 ℃, the motor rotation speed of the combustion waste gas collecting device is regulated to 8 rpm, the gas flow is 5L/min, the carbon dioxide concentration is 8%, and the water vapor generator is regulated to enable the relative humidity of the introduced gas to reach 95%, and the rotation speed of the drying carbonization inner cylinder is 35 rpm. Carbonizing the concrete recycled fine aggregate with the grain size of less than 4.75mm for 30, 60, 90 and 120 minutes, wherein the carbonization degree is 19%,21%,22% and 23% respectively; the water absorption is reduced by 6.9%,7.0%,7.1% and 7.1% respectively.
Example 5:
the gas flow is regulated to 2.5L/min to enable the gas burner to spray flame, the temperature of the outer surface of the drying carbonization inner cylinder reaches 350 ℃, the motor rotation speed of the combustion waste gas collecting device is regulated to 6 revolutions per minute, the gas flow is 4L/min, the carbon dioxide concentration is 13%, and the water vapor generator is regulated to enable the relative humidity of the introduced gas to reach 96%, and the rotation speed of the drying carbonization inner cylinder is 60 revolutions per minute. Carbonizing the concrete recycled fine aggregate with the grain size of less than 4.75mm for 30, 60, 90 and 120 minutes, wherein the carbonization degree is 17%,19%,20% and 21% respectively; the water absorption is reduced by 5.7%,6.8%,7.1% and 7.0% respectively.
Example 6:
the gas flow is regulated to be 1.6L/min, so that the gas burner is enabled to reach smaller flame, the temperature of the outer surface of the drying carbonization inner cylinder is enabled to reach 100 ℃, the motor rotation speed of the combustion waste gas collecting device is regulated to be 10 revolutions per minute, the gas flow is 8L/min, the carbon dioxide concentration is 6%, and the steam generator is regulated so that the relative humidity of the introduced gas is enabled to reach 94%, and the rotation speed of the drying carbonization inner cylinder is 60 revolutions per minute. The recycled fine aggregate of the concrete with the diameter of less than 4.75mm is carbonized for 30, 60, 90 and 120 minutes, the carbonization degree is respectively 51 percent, 79 percent, 87 percent and 94 percent, and the water absorption is respectively reduced by 14.9 percent, 21.1 percent, 25.4 percent and 29.1 percent.
The above examples illustrate only a few embodiments of the invention, which are described in detail and are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.
Claims (10)
1. A system for recycling recycled concrete recycled fine aggregate by using dried waste gas is characterized in that: comprises a drying carbonization device, a combustion waste gas collecting device, a water vapor providing device and a carbonization waste gas collecting and recycling device; the drying and carbonizing device is used for drying and carbonizing regenerated fine aggregate (16) to be dried and carbonized in the device, generated carbonized waste gas is conveyed to the carbonized waste gas collecting and recycling device, and generated combustion waste gas is conveyed to the combustion waste gas collecting device; the combustion waste gas collecting device is used for collecting generated combustion waste gas and then conveying the generated combustion waste gas back to the drying and carbonizing device; the steam supply device is used for generating steam and conveying the steam to the drying and carbonizing device; and the carbonization waste gas collecting and recycling device is used for treating the carbonization waste gas and then circularly conveying the carbonized waste gas back to the drying and carbonizing device.
2. The system for carbonizing concrete recycled fine aggregate by recycling dried waste gas according to claim 1, wherein: the drying and carbonizing device comprises a drying and carbonizing inner cylinder (1), a rotating motor (2) and a supporting roller (3); the drying carbonization inner cylinder (1) is of a hollow cylinder structure, and regenerated fine aggregate (16) to be dried and carbonized is placed in the drying carbonization inner cylinder; the rotary motor (2) is arranged at one side of the drying and carbonizing inner cylinder (1) and provides power for the rotation of the drying and carbonizing inner cylinder (1); the supporting roller (3) is arranged at the bottom of the drying carbonization inner cylinder (1), and the auxiliary rotating motor (2) completes rotation.
3. The system for carbonizing concrete recycled fine aggregate by recycling dried waste gas according to claim 2, wherein: the drying and carbonizing device also comprises a combustible fuel (4) and a fuel combustion assembly (5); the combustible fuel (4) is conveyed and ignited at the bottom of the outer side of the drying carbonization inner cylinder (1) through the fuel combustion assembly (5) and is used for heating the drying carbonization inner cylinder (1) and generating CO-containing gas at the same time 2 Is a waste gas of the engine.
4. A system for carbonizing concrete recycled fine aggregate by recycling dried waste gas according to claim 3, wherein: wherein the fuel combustion assembly (5) can regulate the flow of the combustible fuel (4) with the flow of 2-6g/min; the temperature of the outer surface of the drying carbonization inner cylinder (1) is 60-350 ℃, and the rotation speed is 15-60 revolutions per minute.
5. The system for carbonizing concrete recycled fine aggregate by recycling dried waste gas according to claim 1, wherein: the water vapor supply device comprises a water vapor conveying pipe (9) and a water vapor generator (10); the steam generator (10) is used for generating steam, one end of the steam conveying pipe (9) is communicated with the outlet of the steam generator (10), and the other end of the steam conveying pipe is communicated with the drying carbonization inner cylinder (1).
6. The system for carbonizing concrete recycled fine aggregate by recycling dried waste gas according to claim 1, wherein: the combustion waste gas collecting device comprises a waste gas collecting outer cylinder (6), a combustion waste gas collector, a motor (7) and a combustion waste gas conveying pipeline (8); the waste gas collecting outer cylinder (6) is covered outside the carbonization drying device, the top is connected with the combustion waste gas collector and the motor (7), and one side is provided with a combustion waste gas conveying pipeline (8); the combustion exhaust gas collector and the motor (7) are used for absorbing and collecting generated exhaust gas through motor driving; one end of the combustion waste gas conveying pipeline (8) is communicated with the waste gas collecting outer cylinder (6), and the other end of the combustion waste gas conveying pipeline is communicated with the drying carbonization inner cylinder (1).
7. The system for carbonizing concrete recycled fine aggregate by recycling dried waste gas according to claim 1, wherein: the carbonization waste gas collecting and recycling device comprises a carbonization waste gas discharge pipe (11), a carbon dioxide absorption tank (12), a carbon dioxide release tank (13) and a carbon dioxide release conveying pipe (15); one end of the carbonization waste gas discharge pipe (11) is communicated with the drying carbonization inner cylinder (1), and the other end is communicated with the carbon dioxide absorption tank (12); the carbon dioxide absorption tank (12) is used for absorbing carbon dioxide discharged by the carbonized waste gas discharge pipe (11); the carbon dioxide release tank (13) is communicated with the carbon dioxide absorption tank (12) and is used for releasing carbon dioxide absorbed by the carbon dioxide absorption tank (12) and is communicated to the drying carbonization inner cylinder (1) through a carbon dioxide release conveying pipe (15).
8. The system for carbonizing concrete recycled fine aggregate by recycling dried waste gas according to claim 7, wherein: the carbonization waste gas collecting and recycling device also comprises a heating device (14), wherein the heating device (14) is arranged at the bottom of the carbon dioxide releasing pond (13).
9. The system for carbonizing concrete recycled fine aggregate by recycling dried waste gas according to claim 8, wherein: an organic amine is placed in the carbon dioxide absorption tank (12) and is used for capturing carbon dioxide; the heating device (14) is used for heating the organic amine pool after capturing the carbon dioxide, so that the carbon dioxide is released and enters the carbon dioxide release conveying pipe (15).
10. A method of recycling a system for carbonizing concrete recycled fine aggregate using a dried off gas according to any one of claims 1 to 9, characterized in that: the method comprises the following specific steps of
First pre-job pretreatment
Placing concrete recycled fine aggregate with a certain diameter in a drying carbonization inner cylinder (1), and adjusting the temperature of the outer surface of the drying carbonization inner cylinder to a proper temperature by adjusting a fuel combustion assembly (5) communicated with a combustible fuel (4) to enable the introduced combustible fuel (4) to be a proper gas flow, wherein the rotating speed of a motor is a proper rotating speed; regulating the steam generator (10) to obtain steam of a suitable relative humidity;
(II) drying carbonization and cyclic reaction
Opening a valve of a combustible fuel (4), igniting the fuel, starting a rotating motor (2) to enable a drying carbonization inner cylinder (1) to rotate, starting a steam generator (10) to convey steam, enabling the inside of the drying carbonization inner cylinder (1) to start to work, enabling gas generated in the cylinder to enter a carbon dioxide absorption tank (12) through a carbonization waste gas discharge pipe (11), absorbing carbon dioxide through organic amine placed in the carbon dioxide absorption tank (12), entering a carbon dioxide release tank (13), heating through a heating device (14) to release carbon dioxide, and enabling the carbon dioxide to enter the drying carbonization inner cylinder (1) again through a release carbon dioxide conveying pipe (15); the waste gas collected by the waste gas collecting outer cylinder (6) is collected by a combustion waste gas collector at the top and a motor (7), and then enters the drying carbonization inner cylinder (1) through a combustion waste gas conveying pipeline (8); repeating the circulation process of the step (II), wherein the carbon dioxide content in the generated combustion waste gas is 5-13%, and the adjustable concentration of the carbon dioxide in the combustion waste gas after the treatment of the combustion waste gas collector and the motor (7) is 2-13%;
(III) taking materials
After the drying carbonization is finished, the valve of the combustible fuel (4) can be closed to stop burning, the rotating motor (2) is closed to stop the rotation of the drying carbonization inner cylinder (1), and the water vapor generator (12) is closed to stop the transmission of water vapor; and after the system completely stops running, the rotating motor (2) is regulated to enable the drying carbonization inner cylinder (1) to rotate reversely, the carbonized regenerated fine aggregate in the inner cylinder is poured out, and the recycled fine aggregate of concrete is collected and re-added to prepare for next drying carbonization.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116689459A (en) * | 2023-07-24 | 2023-09-05 | 三碳(安徽)科技研究院有限公司 | Solid waste treatment method for absorbing carbon dioxide and belt type solid waste treatment equipment |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116689459A (en) * | 2023-07-24 | 2023-09-05 | 三碳(安徽)科技研究院有限公司 | Solid waste treatment method for absorbing carbon dioxide and belt type solid waste treatment equipment |
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