CN114409289B - Carbon sequestration system and method for strengthening recycled aggregate and recycled brick - Google Patents
Carbon sequestration system and method for strengthening recycled aggregate and recycled brick Download PDFInfo
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- CN114409289B CN114409289B CN202210232988.9A CN202210232988A CN114409289B CN 114409289 B CN114409289 B CN 114409289B CN 202210232988 A CN202210232988 A CN 202210232988A CN 114409289 B CN114409289 B CN 114409289B
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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
- C04B20/026—Comminuting, e.g. by grinding or breaking; Defibrillating fibres other than asbestos
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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
- C04B7/00—Hydraulic cements
- C04B7/36—Manufacture of hydraulic cements in general
- C04B7/364—Avoiding environmental pollution during cement-manufacturing
- C04B7/367—Avoiding or minimising carbon dioxide emissions
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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
- C04B7/00—Hydraulic cements
- C04B7/36—Manufacture of hydraulic cements in general
- C04B7/43—Heat treatment, e.g. precalcining, burning, melting; Cooling
- C04B7/47—Cooling ; Waste heat management
- C04B7/475—Cooling ; Waste heat management using the waste heat, e.g. of the cooled clinker, in an other way than by simple heat exchange in the cement production line, e.g. for generating steam
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- 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
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Abstract
The invention discloses a carbon sequestration system and method for strengthening recycled aggregate and recycled bricks by recycling hot carbon dioxide in a cement plant. The system comprises a factory, a pipeline system, a solid waste disposal workshop and a brick making workshop, wherein the solid waste disposal workshop comprises a middle solid waste disposal production line and a plurality of material storehouses which are arranged at two sides of the production line in parallel, and the brick making workshop comprises a brick making production line and a cement brick curing kiln at the side of the production line; the pipeline system comprises a main pipeline connected with a factory, a material warehouse pipeline and a cement brick curing kiln pipeline, wherein the material warehouse pipeline and the cement brick curing kiln pipeline are connected with the main pipeline, the material warehouse pipeline extends to the ground of a material warehouse in a solid waste disposal workshop, and a plurality of small holes are formed in the pipeline; the cement brick curing kiln pipeline extends to the lower part of the cement brick in the cement brick curing kiln in the brick making workshop, and a plurality of small holes are formed in the pipeline. The invention makes full use of the waste carbon dioxide and waste heat of the cement plant, reduces the emission of greenhouse gases, makes full use of solid wastes in cement production, and reduces the carbon emission in the cement production process.
Description
Technical Field
The invention belongs to the technical field of carbon sequestration and reinforcement of recycled concrete, and particularly relates to a system and a method for curing recycled aggregate and recycled brick carbon by using carbon dioxide and waste heat in waste gas of a cement plant.
Background
In recent years, due to rapid and stable urbanization, the cement yield and the consumption are very large, and the annual cement yield of China is about 25 hundred million tons, which accounts for 55 percent of the whole world. The average emission of 900kg of carbon dioxide per ton of cement produced is, the cement industry has become the main source of greenhouse gas emission, and the carbon reduction and carbon fixation technology of the cement industry is more and more emphasized under the drive of the 'double carbon' target.
On the other hand, more and more buildings need to be dismantled, the production amount of waste concrete is increased, and the construction waste is called as an urban mine. At present, waste concrete is mainly crushed again and sieved to prepare recycled aggregate, but the quality of the recycled concrete prepared in the way is not satisfactory.
The recycled aggregate is reinforced by carbon dioxide, so that the recycled aggregate has better physical and mechanical properties and durability; the emission of carbon dioxide is also reduced. In addition, the waste gas discharged from the field of cement industry contains carbon dioxide with high residual heat, and the part of heat energy also has utilization value and can promote the generation and development of cement hydration and solidification.
The essence of carbon dioxide reinforced recycled aggregate and recycled concrete is that carbon dioxide is dissolved in water to generate carbonic acid, and then reacts with hydration products such as calcium hydroxide, calcium silicate hydrate and the like or unhydrated components, the most important of the reactions is that calcium hydroxide and carbon dioxide generate calcium carbonate crystals, the reaction rate is influenced by a plurality of factors, and the carbon fixation efficiency of the recycled aggregate is accelerated by the currently common method through heating, pressurizing, humidity control and the like.
At present, if the waste carbon dioxide and waste heat generated by a cement plant are fully utilized, the method is worth further research.
Disclosure of Invention
The purpose of the invention is as follows: in order to solve the problems in the prior art, the invention provides a carbon sequestration system and method for strengthening recycled aggregate and recycled bricks.
The technical scheme is as follows: in order to achieve the purpose, the invention adopts the following technical scheme:
a carbon fixation system for reinforcing recycled aggregate and recycled bricks comprises a cement plant, a pipeline system, a solid waste disposal workshop and a brick making workshop, wherein the solid waste disposal workshop comprises a middle solid waste disposal production line and a plurality of material storehouses which are arranged at two sides of the production line in parallel, and the brick making workshop comprises a brick making production line and a cement brick curing kiln at the side of the production line; the pipeline system comprises a main pipeline connected with a cement plant, a material warehouse pipeline and a cement brick curing kiln pipeline, wherein the material warehouse pipeline and the cement brick curing kiln pipeline are connected with the main pipeline; the cement brick curing kiln pipeline extends to the lower part of the cement brick in the cement brick curing kiln in the brick making workshop, and a plurality of small holes are formed in the pipeline.
Preferably, a first flowmeter is arranged on the main pipeline; a second flowmeter and a third flowmeter are arranged on the material storage pipeline; a fourth flowmeter is arranged on the cement brick curing kiln pipeline; the flow meters all have the functions of a thermometer and a pressure gauge at the same time.
Preferably, the material warehouse comprises a material warehouse A, a material warehouse B, a material warehouse C, a material warehouse D, a material warehouse E and a material warehouse F, wherein the material warehouse A, the material warehouse C and the material warehouse E are arranged on two sides of the production line in parallel, the material warehouse A, the material warehouse C and the material warehouse E are sequentially arranged on one side of the production line in parallel, and the material warehouse B, the material warehouse D and the material warehouse F are sequentially arranged on the other side of the production line in parallel.
Further preferably, the material warehouse A and the material warehouse B store 0-5mm of recycled fine aggregate; the material storehouses C and D store 5-16mm of recycled coarse aggregates; the bins E and F store 16-31.5mm recycled coarse aggregate.
Preferably, the material warehouse pipeline is positioned on the ground of the material warehouse and is connected with a plurality of material warehouse branch pipelines, and small holes are reserved in the material warehouse branch pipelines.
Preferably, the branch pipeline of the material storehouse is a square steel pipe, the side length is 35mm-50mm, and the wall thickness is preferably 4mm-5mm; the diameter of the small holes is 4mm-8mm, and the distance is 200mm-300mm.
Preferably, the cement bricks in the cement brick curing kilns are placed on supporting plates, the supporting plates are placed on the supports of the inner walls of the curing kilns, two curing kiln branch pipelines are arranged below each layer of supporting plates, small holes are formed in the pipelines, and the curing kiln branch pipelines are connected with the cement brick curing kiln pipelines.
A carbon sequestration method for strengthening recycled aggregate and recycled bricks comprises the following steps:
by utilizing the system, waste carbon dioxide and waste heat discharged by a cement plant are conveyed to a material warehouse of a solid waste disposal workshop and a cement brick curing kiln of a brick making workshop through a pipeline system, and waste CO is discharged2Waste heat is dispersed into the material storehouse and the curing kiln through small holes on the pipeline, and the recycled aggregate and the recycling process are strengthened; meanwhile, the recycled fine aggregate produced by the silo can be used as a cement admixture for cement plants and can also enter a brick making vehicleThe chamber is used for manufacturing cement bricks.
Preferably, waste CO is introduced into the material warehouse2Before waste heat, crushing, screening, cleaning and other steps of building solid waste to prepare recycled aggregate, simultaneously taking normal-temperature water as a solvent and sodium bicarbonate solid as a solute to form a saturated sodium bicarbonate solution, introducing the saturated sodium bicarbonate solution into a material warehouse, keeping the temperature at normal temperature, and then introducing waste CO2And waste heat.
In order to reduce the emission of carbon dioxide in the cement industry, the recycled aggregate and the recycled concrete are reinforced by utilizing a carbon dioxide reinforcing technology. The invention utilizes the waste gas discharged by a cement plant, which contains carbon dioxide with the concentration of about 25 percent and waste heat with the temperature of about 70 ℃, to accelerate the carbonization of the recycled aggregate and improve the carbonization rate so as to improve the mechanical property of the recycled concrete.
Has the advantages that: compared with the prior art, the invention has the following advantages:
1. the carbon dioxide generated by the cement industry and the attached higher residual temperature are utilized to carbonize the recycled aggregate and the cement brick, so that the carbon dioxide is fully utilized, and the emission of greenhouse gases is reduced.
2. The carbonized recycled aggregate and the cement brick have high strength and good durability.
3. The hot carbon dioxide is used for carbonizing the cement bricks, so that the curing time can be shortened, and the turnover of the curing kiln is accelerated.
4. The recycled fine aggregate from the solid waste of the building can be used as a mixture in the cement industry, so that the solid waste is fully utilized in the cement production, and the carbon emission in the cement production process is reduced.
Drawings
FIG. 1 is a schematic diagram of the system of the present invention.
Fig. 2 is a top view of a warehouse in the system of the present invention.
FIG. 3 is a detailed view of the ground section of the material warehouse in the system of the present invention.
FIG. 4 is a front view of a cement brick curing kiln of the system of the present invention.
Detailed Description
The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
Example 1
A carbon fixation system for strengthening recycled aggregate and recycled bricks comprises a cement plant 1, a pipeline system 2, a solid waste disposal workshop 3 and a brick making workshop 4 as shown in figure 1, wherein the solid waste disposal workshop 3 comprises a middle solid waste disposal production line and a plurality of material storehouses arranged in parallel at two sides of the production line, and the brick making workshop 4 comprises a brick making production line and a cement brick curing kiln at the side of the production line; the pipeline system 2 comprises a main pipeline 21 connected with the cement plant 1, and a material warehouse pipeline 22 and a cement brick curing kiln pipeline 23 which are connected with the main pipeline 21, wherein the material warehouse pipeline 22 extends to the ground of a material warehouse in the solid waste disposal workshop 3, and a plurality of small holes are arranged on the pipeline; the cement brick curing kiln pipeline 23 extends to the lower part of the cement bricks in the cement brick curing kiln in the brick making workshop 4, and a plurality of small holes are arranged on the pipeline.
A first flowmeter 5 is arranged on the main pipeline 21; a second flowmeter 6 and a third flowmeter 7 are arranged on the material storage pipeline 22; a fourth flowmeter 8 is arranged on the cement brick curing kiln pipeline 23; the flow meters all have the functions of a thermometer and a pressure gauge at the same time.
The material warehouse comprises a material warehouse A, a material warehouse B, a material warehouse C, a material warehouse D, a material warehouse E and a material warehouse F, wherein the material warehouse A, the material warehouse C and the material warehouse E are arranged on two sides of the production line in parallel, the material warehouse A, the material warehouse C and the material warehouse E are sequentially arranged on one side of the production line in parallel, and the material warehouse B, the material warehouse D and the material warehouse F are sequentially arranged on the other side of the production line in parallel. The material storehouses A and B store 0-5mm of recycled fine aggregate; the material storehouses C and D store 5-16mm of recycled coarse aggregates; the bins E and F store 16-31.5mm recycled coarse aggregate.
As shown in fig. 2 and 3, the material storage pipe 22 is located on the ground of the material storage, and is connected to a plurality of material storage branch pipes 220, and small holes 221 are reserved on the material storage branch pipes 220. The branch pipe 220 of the material storehouse is a square steel pipe with the side length of 35mm-50mm and the preferred wall thickness of 4mm-5mm; the diameter of the small holes 221 is 4mm-8mm, and the distance is 200mm-300mm.
As shown in FIG. 4, the cement bricks 40 in the brick kiln are placed on a pallet 41, the pallet 41 is placed on a support 42 of the inner wall of the kiln, two branch ducts 43 of the kiln are arranged under each layer of the pallet 41, small holes are arranged on the ducts, and the branch ducts 43 of the kiln are all connected with the pipes 23 of the brick kiln.
The working method and principle of the system are as follows:
waste CO discharged from Cement plant 12And the waste heat is conveyed to a building solid waste disposal plant through a pipeline system 2, the pipeline system 2 is provided with a flowmeter and has the functions of a thermometer and a pressure gauge, and the waste CO in the pipeline system 22And waste heat is transported via a flow meter to a solid waste disposal plant 3, waste CO2And waste heat is also conveyed to the brick making plant 4 via a flow meter. The solid waste disposal workshop 3 mainly comprises a solid waste disposal production line and a matched material warehouse. Waste CO2And waste heat is conveyed to the material storehouse through a pipeline, enters a material storehouse branch pipeline 220 distributed on the ground of the material storehouse, and is discharged from a small hole 221 on the pipeline, so that the recycled aggregate stocked in the material storehouse is carbonized. The material warehouse A and the material warehouse B are alternately used as a carbonization warehouse and a material warehouse, when the material warehouse A is full of materials, the recycled aggregate piled in the material warehouse A starts to be carbonized, the carbonization period is preferably 3 days, and simultaneously, the material warehouse B is used as a material warehouse to start to charge materials. And when the carbonization process of the recycled aggregate in the carbonization library A is basically finished, starting to use the recycled aggregate in the material library A, and simultaneously, starting to carbonize the aggregate in the material library B. The material warehouse C and the material warehouse D are alternately used as a carbonization warehouse and a charging warehouse; and the material warehouse E and the material warehouse F are alternately used as a carbonization warehouse and a charging warehouse.
The carbonized recycled fine aggregate with the thickness of 0-5mm in the material storehouses A and B can be used as a cement admixture for cement plants to reduce the carbon emission in cement production and achieve the aim of recycling.
The carbonized 0-5mm recycled fine aggregate in the material storehouses A and B can also enter a brick making workshop 4 for manufacturing cement bricks, the brick making workshop 4 is provided with a cement brick curing kiln, and waste CO2And introducing waste heat into the cement brick curing kiln to perform carbonization curing on the cement brick.
Example 2
A carbon sequestration method for strengthening recycled aggregate and recycled bricks comprises the following steps:
using the system of example 1 above, waste carbon dioxide and waste heat from a cement plant were transported to solid waste via piping systemPlacing stock houses in the workshop and cement brick curing kilns in the brick making workshop, and waste CO2Waste heat is dispersed into the material warehouse and the curing kiln through small holes on the pipeline, and the recycled aggregate and the recycling process are strengthened; meanwhile, the recycled fine aggregate produced by the silo can be used as a cement admixture for cement factories and can also enter a brick making workshop for making cement bricks.
Firstly, crushing, screening, cleaning and the like the building solid waste to prepare recycled aggregate, simultaneously taking normal-temperature water as a solvent and sodium bicarbonate solid as a solute to form a saturated sodium bicarbonate solution, introducing the saturated sodium bicarbonate solution into a recycled aggregate carbonization chamber, and keeping the temperature at the normal temperature. And then, controlling the circulation rate of water to adjust the relative humidity in the carbonization chamber to be 50% -70% as much as possible by using industrial carbon dioxide with higher temperature through a heat transfer mode, and controlling the circulation rate of the carbon dioxide with higher temperature in a spiral ventilation pipeline to adjust the internal temperature of the carbonization system, wherein the method does not involve a pressurization step, and the internal temperature of the carbonization system is 60 ℃ optimally. During the carbonization reaction, the concentration of carbon dioxide in the system can be measured in real time, and when the concentration indication is kept unchanged or changes slowly, the introduction of carbon dioxide is stopped. After the carbonization reaction, cooling, filtering and collecting residual solution which mainly comprises sodium carbonate and sodium bicarbonate, and further obtaining carbon dioxide gas with residual heat by a heating mode.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (9)
1. A carbon fixation system for reinforcing recycled aggregate and recycled bricks is characterized by comprising a cement plant (1), a pipeline system (2), a solid waste disposal workshop (3) and a brick making workshop (4), wherein the solid waste disposal workshop (3) comprises a middle solid waste disposal production line and a plurality of material storehouses arranged on two sides of the production line in parallel, and the brick making workshop (4) comprises a brick making production line and cement brick curing kilns on the sides of the production line; the pipeline system (2) comprises a main pipeline (21) connected with the cement plant (1), a material warehouse pipeline (22) and a cement brick curing kiln pipeline (23) which are connected with the main pipeline (21), the material warehouse pipeline (22) extends to the ground of a material warehouse in the solid waste disposal workshop (3), and a plurality of small holes are formed in the pipeline; the cement brick curing kiln pipeline (23) extends to the lower part of the cement brick in the cement brick curing kiln in the brick making workshop (4), and a plurality of small holes are arranged on the pipeline.
2. The carbon sequestration system for strengthening recycled aggregates and recycled bricks according to claim 1, characterized in that a first flowmeter (5) is provided on said main pipe (21); a second flowmeter (6) and a third flowmeter (7) are arranged on the material storage pipeline (22); a fourth flowmeter (8) is arranged on the cement brick curing kiln pipeline (23); the flow meters all have the functions of a thermometer and a pressure gauge at the same time.
3. The carbon sequestration system for reinforced recycled aggregate and recycled bricks according to claim 1, wherein the material warehouse comprises a material warehouse A, a material warehouse B, a material warehouse C, a material warehouse D, a material warehouse E and a material warehouse F, which are arranged in parallel on two sides of the production line, the material warehouse A, the material warehouse C and the material warehouse E are sequentially arranged in parallel on one side of the production line, and the material warehouse B, the material warehouse D and the material warehouse F are sequentially arranged in parallel on the other side of the production line.
4. The carbon sequestration system for strengthening recycled aggregate and recycled bricks according to claim 3, characterized in that said warehouse A and warehouse B store 0-5mm of recycled fine aggregate; the material storehouses C and D store 5-16mm of recycled coarse aggregates; the bins E and F store 16-31.5mm recycled coarse aggregate.
5. The carbon sequestration system for strengthening recycled aggregate and recycled bricks according to claim 1, characterized in that the material storage pipeline (22) is located on the ground of the material storage, and is connected with a plurality of material storage branch pipelines (220), and small holes (221) are reserved on the material storage branch pipelines (220).
6. The carbon sequestration system for strengthening recycled aggregate and recycled bricks according to claim 5, wherein the branch conduit (220) of the material storehouse is a square steel tube with a side length of 35mm-50mm and a wall thickness of 4mm-5mm; the diameter of the small holes (221) is 4mm-8mm, and the distance is 200mm-300mm.
7. The system for carbon sequestration of recycled aggregate and bricks for reinforcement according to claim 1, wherein the cement bricks (40) in the cement brick curing kiln are placed on pallets (41), the pallets (41) are placed on supports (42) on the inner wall of the curing kiln, two curing kiln branch pipes (43) are arranged under each layer of pallets (41), small holes are arranged on the pipes, and the curing kiln branch pipes (43) are connected with the cement brick curing kiln pipes (23).
8. A carbon sequestration method for strengthening recycled aggregate and recycled bricks is characterized by comprising the following steps:
the system as claimed in any one of claims 1 to 7, wherein waste carbon dioxide and waste heat from cement plants are transported via piping to stockhouses in solid waste disposal plants and cement brick curing kilns in brick-making plants, and waste CO is transported to the brick-making plants2Waste heat is dispersed into the material warehouse and the curing kiln through small holes on the pipeline, and the recycled aggregate and the recycling process are strengthened; meanwhile, the recycled fine aggregate produced by the silo can be used as a cement admixture for cement factories and can also enter a brick making workshop for making cement bricks.
9. The method for carbon sequestration of reinforced recycled aggregate and recycled bricks according to claim 8, characterized in that the silo is charged with waste CO2Before waste heat, crushing, screening and cleaning the building solid waste to prepare recycled aggregate, simultaneously taking normal-temperature water as a solvent and sodium bicarbonate solid as a solute to form a saturated sodium bicarbonate solution, introducing the saturated sodium bicarbonate solution into a material warehouse, keeping the temperature at the normal temperature, and then introducing waste CO2And waste heat.
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| CN115582906A (en) * | 2022-10-14 | 2023-01-10 | 太仓金马智能装备有限公司 | System and method for preparing carbon-fixing building material by using building decoration garbage recycled aggregate |
| CN115608745A (en) * | 2022-10-14 | 2023-01-17 | 太仓金马智能装备有限公司 | System and method for producing carbon-fixing recycled aggregate by using building decoration garbage |
| CN116283142A (en) * | 2023-03-03 | 2023-06-23 | 湖北工业大学 | Commercial mixing station carbon fixation ready-mixed concrete and preparation method thereof |
| CN116283089A (en) * | 2023-03-03 | 2023-06-23 | 湖北工业大学 | Preparation method of commercial mixing station carbon fixation reinforced recycled aggregate |
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| CN109320290A (en) * | 2018-11-02 | 2019-02-12 | 山西大学 | A kind of processing method of concrete prefabricated product enhancing carbon sequestration |
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| CN109320290A (en) * | 2018-11-02 | 2019-02-12 | 山西大学 | A kind of processing method of concrete prefabricated product enhancing carbon sequestration |
| CN110183194A (en) * | 2019-05-10 | 2019-08-30 | 东南大学 | A kind of preparation method of microorganism-steel slag carbon sequestration water-permeable brick |
| CN113582608A (en) * | 2021-07-05 | 2021-11-02 | 天津大学 | Low-carbon cement and preparation method thereof |
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