CN117359780A - Concrete building material production system based on multi-point microcrystalline mineralization of composite carbon dioxide - Google Patents
Concrete building material production system based on multi-point microcrystalline mineralization of composite carbon dioxide Download PDFInfo
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- CN117359780A CN117359780A CN202311129428.1A CN202311129428A CN117359780A CN 117359780 A CN117359780 A CN 117359780A CN 202311129428 A CN202311129428 A CN 202311129428A CN 117359780 A CN117359780 A CN 117359780A
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- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 title claims abstract description 367
- 239000001569 carbon dioxide Substances 0.000 title claims abstract description 182
- 229910002092 carbon dioxide Inorganic materials 0.000 title claims abstract description 182
- 239000004567 concrete Substances 0.000 title claims abstract description 101
- 239000004566 building material Substances 0.000 title claims abstract description 77
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 72
- 230000033558 biomineral tissue development Effects 0.000 title claims abstract description 45
- 239000002131 composite material Substances 0.000 title claims abstract description 31
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 40
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 39
- 239000002994 raw material Substances 0.000 claims abstract description 35
- 239000002002 slurry Substances 0.000 claims abstract description 23
- 238000006243 chemical reaction Methods 0.000 claims abstract description 21
- 238000012545 processing Methods 0.000 claims abstract description 12
- 239000000443 aerosol Substances 0.000 claims description 32
- 238000003756 stirring Methods 0.000 claims description 30
- 239000007788 liquid Substances 0.000 claims description 28
- 238000005728 strengthening Methods 0.000 claims description 21
- 238000004090 dissolution Methods 0.000 claims description 16
- 230000000087 stabilizing effect Effects 0.000 claims description 12
- 239000000463 material Substances 0.000 claims description 8
- 238000003860 storage Methods 0.000 claims description 8
- 238000005191 phase separation Methods 0.000 claims description 7
- 230000009467 reduction Effects 0.000 claims description 6
- 230000006641 stabilisation Effects 0.000 claims description 5
- 238000011105 stabilization Methods 0.000 claims description 5
- 239000002904 solvent Substances 0.000 claims description 4
- 239000011398 Portland cement Substances 0.000 claims description 3
- 230000006837 decompression Effects 0.000 claims description 3
- 230000002787 reinforcement Effects 0.000 claims description 3
- 239000002910 solid waste Substances 0.000 claims description 3
- 239000003513 alkali Substances 0.000 claims description 2
- 230000007935 neutral effect Effects 0.000 claims description 2
- 238000010521 absorption reaction Methods 0.000 abstract description 8
- 238000002360 preparation method Methods 0.000 abstract description 6
- 239000007789 gas Substances 0.000 description 20
- 238000000034 method Methods 0.000 description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 11
- 239000004568 cement Substances 0.000 description 7
- 238000013461 design Methods 0.000 description 7
- 229910001220 stainless steel Inorganic materials 0.000 description 7
- 239000010935 stainless steel Substances 0.000 description 7
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 6
- 230000008569 process Effects 0.000 description 6
- 239000002893 slag Substances 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 4
- 238000002156 mixing Methods 0.000 description 4
- 238000012546 transfer Methods 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 3
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 3
- 235000011089 carbon dioxide Nutrition 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000004137 mechanical activation Methods 0.000 description 3
- 239000013081 microcrystal Substances 0.000 description 3
- 238000000465 moulding Methods 0.000 description 3
- 235000011837 pasties Nutrition 0.000 description 3
- 229920006395 saturated elastomer Polymers 0.000 description 3
- 238000007789 sealing Methods 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 2
- 241000196324 Embryophyta Species 0.000 description 2
- 239000012752 auxiliary agent Substances 0.000 description 2
- 239000000378 calcium silicate Substances 0.000 description 2
- 229910052918 calcium silicate Inorganic materials 0.000 description 2
- OYACROKNLOSFPA-UHFFFAOYSA-N calcium;dioxido(oxo)silane Chemical compound [Ca+2].[O-][Si]([O-])=O OYACROKNLOSFPA-UHFFFAOYSA-N 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 239000010881 fly ash Substances 0.000 description 2
- 239000012774 insulation material Substances 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 239000011178 precast concrete Substances 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 230000001737 promoting effect Effects 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 238000000859 sublimation Methods 0.000 description 2
- 230000008022 sublimation Effects 0.000 description 2
- BVKZGUZCCUSVTD-UHFFFAOYSA-M Bicarbonate Chemical compound OC([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-M 0.000 description 1
- 240000007594 Oryza sativa Species 0.000 description 1
- 235000007164 Oryza sativa Nutrition 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 238000007792 addition Methods 0.000 description 1
- 238000013019 agitation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 239000000920 calcium hydroxide Substances 0.000 description 1
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 1
- -1 calcium modified silica gel Chemical class 0.000 description 1
- 229910021386 carbon form Inorganic materials 0.000 description 1
- JYYOBHFYCIDXHH-UHFFFAOYSA-N carbonic acid;hydrate Chemical compound O.OC(O)=O JYYOBHFYCIDXHH-UHFFFAOYSA-N 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 239000011162 core material Substances 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000005261 decarburization Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 239000000499 gel Substances 0.000 description 1
- 239000005431 greenhouse gas Substances 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000001089 mineralizing effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000004570 mortar (masonry) Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 229920002635 polyurethane Polymers 0.000 description 1
- 239000004814 polyurethane Substances 0.000 description 1
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- 230000036632 reaction speed Effects 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 235000009566 rice Nutrition 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 230000002269 spontaneous effect Effects 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- 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
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/02—Selection of the hardening environment
- C04B40/0231—Carbon dioxide hardening
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B1/00—Producing shaped prefabricated articles from the material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B11/00—Apparatus or processes for treating or working the shaped or preshaped articles
- B28B11/24—Apparatus or processes for treating or working the shaped or preshaped articles for curing, setting or hardening
- B28B11/245—Curing concrete articles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28C—PREPARING CLAY; PRODUCING MIXTURES CONTAINING CLAY OR CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28C5/00—Apparatus or methods for producing mixtures of cement with other substances, e.g. slurries, mortars, porous or fibrous compositions
- B28C5/003—Methods for mixing
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Structural Engineering (AREA)
- Mechanical Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Physical Or Chemical Processes And Apparatus (AREA)
Abstract
The invention discloses a concrete building material production system based on complex state carbon dioxide multipoint microcrystalline mineralization, which belongs to the field of carbon dioxide mineralization and concrete preparation, and comprises a complex state carbon dioxide generation module, a raw material treatment module, a concrete production module and an external carbon source, wherein the complex state carbon dioxide generation module comprises a short-range phase splitting device, a long Cheng Qitai buffer device and a pressure type dissolving device; the carbon source from the external carbon source is processed by the composite carbon dioxide generating module and then outputs carbon dioxide in a state required by the corresponding module to the raw material processing module or the concrete production module; the prefabricated building material or slurry is prepared by a raw material processing module and a concrete production module and is further used for preparing concrete building material finished products. The system can realize the preparation of carbon dioxide in various states so as to adapt to different concrete building material product production processes, thereby improving the production efficiency of concrete building materials and the carbon dioxide absorption conversion rate.
Description
Technical Field
The invention relates to the field of carbon dioxide mineralization and concrete preparation, in particular to a concrete building material production system based on multi-point microcrystalline mineralization of composite carbon dioxide.
Background
In recent years, the emission of greenhouse gases mainly containing carbon dioxide is huge, and the carbon emission is reduced and CO is realized 2 Is an important measure for promoting sustainable development. However, the building material industry using Portland cement as a core material has high emission reduction pressure, difficult decarburization and CO 2 The mineralized resource utilization technology opens up a large-scale low-carbon path for the building material industry. Because the reaction is spontaneous at normal temperature, the reaction speed is high, and the reaction has obvious exothermic effect, compared with the traditional building material production/curing process, CO 2 The mineralized building material has the characteristics of mild reaction conditions, high production efficiency, low energy consumption and the like. In addition, due to the alkaline components (such as calcium silicate clinker, hydrated calcium silicate gel, calcium hydroxide, etc.) in the building material system, the building material system has the following characteristics of CO 2 The carbonate crystals and the calcium modified silica gel are formed by transformation in the mineralization process, so that the performance of the material is enhanced, and the rapid formation of strength of the material is promoted. Because of various building material products, different building materials (including raw material aggregate, cementing material, prefabricated member, ready-mixed concrete and the like) are used for preparing CO 2 The mineralized reaction form, the state of the gas source, the reactor form and the like are subject to high requirements.
Most of the existing concrete building material production modes mainly include conventional concrete stirring and precast element autoclaved curing. The premixed concrete mixing plant technology is mature, and the main carbon emission is concentrated in the production of raw material cement, wherein the equivalent carbon emission per 1kg of cement reaches 0.6-1 kg, so that the higher cement content ensures that the carbon emission in the whole life cycle of commercial premixed concrete products is high; for autoclaved curing of prefabricated building materials, the existing products are high in industrial solid waste content, so that the requirements on steam quality are high, the pressure is generally required to be more than 1MPa, the temperature is generally required to be more than 180 ℃, and carbon emission of the whole life cycle of the products is also influenced.
The Chinese patent document with publication number of CN108327072A discloses a building material product production system based on carbon dioxide cascade mineralization, which realizes CO by utilizing a cascade mineralization strengthening device 2 High production efficiency and CO of mineralized maintenance prefabricated building block 2 Conversion rate and production energy consumption are reduced. But the technology is to CO 2 The requirement of gas partial pressure is higher, the equipment investment of the reinforced kettle is larger, and the product is only limited to precast concrete building materials.
The Chinese patent publication No. CN115536432A discloses a method for mineralizing and curing concrete prefabricated parts by carbon dioxide, which comprises the steps of penetrating carbonated water and bicarbonate into the concrete surface in a mold, and then carrying out CO in a closed space 2 Mineralization can realize rapid demoulding of concrete and form early strength. But the technology is CO 2 The mineralization efficiency is limited, the process operability is poor, and the method is also only suitable for precast concrete building materials.
The Chinese patent document with publication No. CN109368642A discloses a method for improving the carbon dioxide absorption efficiency of fresh concrete, which comprises introducing CO into fresh concrete 2 Gas and stirring and grinding, thereby promoting the cement paste system to CO 2 Form carbonate crystallites by absorption of (C) to strengthen CO 2 Absorption rate. However, for fresh concrete, CO 2 The gas-liquid interface of the gas and the fresh concrete has high mass transfer resistance, which can cause uneven surface and internal reaction and the whole process CO 2 Low utilization rate.
Therefore, there is a need for a method of achieving CO in a complex state 2 The production system is applicable to different concrete building materials, has high conversion rate and strong operability.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a concrete building material production system based on multi-point microcrystalline mineralization of composite carbon dioxide, which can realize preparation of carbon dioxide in various states so as to adapt to different concrete building material product production processes, thereby improving the production efficiency of concrete building materials and the carbon dioxide absorption conversion rate.
The technical scheme adopted is as follows:
a concrete building material production system based on multi-point microcrystalline mineralization of composite carbon dioxide comprises a composite carbon dioxide generation module, a raw material treatment module, a concrete production module and an external carbon source;
the composite carbon dioxide generating module comprises a short-range phase splitting device, a long Cheng Qitai buffer device and a pressure type dissolving device; the short-range phase splitting device is used for converting liquid carbon dioxide into wet aerosol carbon dioxide, and the long Cheng Qitai buffer device is used for converting liquid carbon dioxide or dry aerosol carbon dioxide into gaseous carbon dioxide with stable pressure; the pressure type dissolving device is used for converting gaseous carbon dioxide into dissolved carbon dioxide;
the carbon source from the external carbon source is processed by the composite carbon dioxide generating module and then outputs carbon dioxide in a state required by the corresponding module to the raw material processing module or the concrete production module; the prefabricated building material or slurry is prepared by a raw material processing module and a concrete production module and is further used for preparing concrete building material finished products.
Preferably, the concrete building material production system based on the multi-point microcrystalline mineralization of the composite carbon dioxide further comprises a mobile strengthening module, wherein the carbon source from the external carbon source is processed by the composite carbon dioxide generating module and then outputs carbon dioxide in a state required by the corresponding module to the raw material processing module, the concrete production module or the mobile strengthening module; and the movable strengthening module further prepares the slurry prepared by the concrete production module into a concrete building material finished product.
The invention can realize the provision of various carbon sources such as gaseous carbon dioxide, liquid carbon dioxide, aerosol carbon dioxide, dissolved carbon dioxide and humidity-controllable carbon dioxide, and the like through the design of the composite carbon dioxide generation module, flexibly adapt to the high-efficiency carbon dioxide multipoint microcrystalline mineralization of concrete building material raw materials and products in different types and states, effectively cover various building material production processes of carbon dioxide multipoint microcrystalline mineralization, and improve the production efficiency of the concrete building materials.
The short-path phase separation device comprises a stop valve, a humidifying chamber and a steam/humidity generator, wherein the liquid carbon dioxide is decompressed by the stop valve to form dry aerosol carbon dioxide, and the dry aerosol carbon dioxide is input into a long Cheng Qitai buffer device through a pipeline or is input into the humidifying chamber for phase separation and then stable aerosol carbon dioxide is output; the steam/humidity generator is connected with the humidifying chamber to ensure that saturated steam is inside the humidifying chamber, and the temperature is maintained at room temperature.
Preferably, in order to secure the safety of the humidification chamber, a safety valve is provided inside the humidification chamber to prevent pressure accumulation.
Preferably, the stop valve is a valve with controllable opening, and a flowmeter is arranged at the front end of the stop valve to meter the liquid carbon dioxide.
Preferably, the connecting pipeline in the short-range phase splitting device uses a stainless steel hose, and the stainless steel hose is wrapped with a heat insulation material to ensure stable carbon dioxide property.
The long Cheng Qitai buffer device comprises a long-range heat exchange tube, a pressure reducing valve group and a gaseous buffer tank which are connected in sequence; and the dry aerosol carbon dioxide from the stop valve or the liquid carbon dioxide from an external carbon source enters the gaseous buffer tank for pressure stabilization after being subjected to heat exchange through the long-range heat exchange tube and pressure reduction through the pressure reducing valve group, and the gaseous carbon dioxide with stable pressure is output.
Preferably, the long-range heat exchange tube is made of stainless steel with good heat conductivity, the outer tube wall is provided with a plurality of groups of radiating fins along the length direction so as to strengthen heat exchange between liquid carbon dioxide working medium in the tube and air, and the tail end of the long-range heat exchange tube is provided with an auxiliary heating device with variable power, so that heat exchange efficiency is ensured.
Preferably, the design pressure of the inlet of the pressure reducing valve group is 5MPa, and the outlet pressure is 0-5 MPa.
Preferably, the design pressure of the gas buffer tank is not lower than 2.5MPa, and a safety valve is arranged to ensure the safety of the pressure.
The pressure type dissolving device comprises a gas storage tank, a dissolving stirring tank and a pressure stabilizing valve; the method comprises the steps of inputting gaseous carbon dioxide from a gaseous buffer tank or an external carbon source into a dissolution stirring tank filled with solvent after stabilizing pressure by a gas storage tank, applying pressure and stirring, outputting dissolved carbon dioxide, and stabilizing the internal pressure of the dissolution stirring tank by a pressure stabilizing valve; the pressure stabilizing valve is connected with the gaseous buffer tank through the drying device and the booster fan, and the exhaust gas generated by the dissolution stirring tank is recovered.
Such solvents include, but are not limited to, water, saturated calcium hydroxide solution, sodium hydroxide solution, and the like.
Preferably, the dissolving and stirring tank body is made of stainless steel, a tetrafluoro lining is arranged, the design pressure is not lower than 1MPa, and a magnetic coupling stirring piece is arranged in the dissolving and stirring tank body.
Preferably, a stop valve with controllable opening is arranged at the liquid outlet of the dissolution stirring tank to control the flow of the output dissolved carbon dioxide.
The raw material treatment module is connected with the long Cheng Qitai buffer device through a pipeline, and receives the gaseous carbon dioxide with stable pressure output by the long Cheng Qitai buffer device, and performs pretreatment operations such as crushing, stirring, strengthening and the like on building materials.
Preferably, the strengthening method is mechanical activation wet multipoint microcrystalline mineralization strengthening. The wet mechanical activation method is to control the humidity of building materials, input carbon source for mechanical activation, and carry out mass transfer strengthening and multipoint microcrystal mineralization reaction to strengthen the reaction process and mineralization efficiency; the building materials are recycled after the exhaust gas generated after the multipoint microcrystal mineralization.
The building materials include, but are not limited to: portland cement, alkali neutral industrial solid waste (such as fly ash, blast furnace slag, carbide slag, steel slag and the like), building material aggregate (such as artificial lightweight aggregate, waste concrete recycled aggregate and the like), carbonating active cementing material and the like.
The concrete production module is connected with the short-range phase splitting device, the long Cheng Qitai buffer device and the pressure type dissolving device through pipelines respectively; the concrete production module receives the wet gas sol state carbon dioxide output by the short-range phase splitting device, or receives the gaseous carbon dioxide with stable pressure output by the long Cheng Qitai buffer device, or receives the dissolved state carbon dioxide output by the pressure type dissolving device, and the wet gas sol state carbon dioxide, the gaseous carbon dioxide with stable pressure or the dissolved state carbon dioxide and the building material raw materials conveyed by the raw material treatment module are utilized to carry out multipoint microcrystalline mineralization reaction, so that the prefabricated building material or slurry is prepared.
The prefabricated building materials or slurries that can be produced by the concrete production modules include, but are not limited to, commercial ready-mixed concrete, construction slurries, clean slurries, mortar, and the like.
The movable strengthening module is connected with the short-range phase splitting device and the pressure type dissolving device through pipelines respectively; the movable strengthening module receives the wet aerosol carbon dioxide output by the short-range phase splitting device or receives the dissolved carbon dioxide output by the pressure type dissolving device, so that the slurry and the wet aerosol carbon dioxide or the dissolved carbon dioxide carry out multipoint microcrystalline mineralization reaction, and a finished product of the concrete building material is prepared.
Preferably, the movable strengthening module is a concrete mixer truck, and can be filled with composite carbon dioxide.
Compared with the prior art, the invention has the beneficial effects that:
(1) The composite carbon dioxide generating module in the system can provide various carbon sources such as gaseous carbon dioxide, liquid carbon dioxide, aerosol carbon dioxide, dissolved carbon dioxide and humidity-controllable composite carbon dioxide, is flexibly suitable for the high-efficiency carbon dioxide multipoint microcrystalline mineralization of concrete building material raw materials and products in different types and states, effectively covers various building material production processes of carbon dioxide multipoint microcrystalline mineralization, and improves the production efficiency of the concrete building materials.
(2) The raw material treatment module in the system can realize crushing, stirring, mass transfer strengthening and multipoint microcrystalline mineralization reaction of granular and powdery building material raw materials, and through a specific exhaust gas recycling design, the mass transfer and reaction absorption efficiency of carbon dioxide in the building material raw materials is enhanced, and meanwhile, the utilization rate of the carbon dioxide raw materials is improved, and the treatment efficiency is further improved.
(3) According to the invention, the concrete production module is matched with the movable strengthening module, so that multipoint microcrystalline mineralization of the premixed slurry material from production to transportation can be realized, concrete production and transportation procedures with different requirements can be flexibly met, and the high-efficiency carbon reduction of the whole life cycle of a concrete product is realized.
Drawings
FIG. 1 is a schematic diagram of a concrete building material production system based on multi-point microcrystalline mineralization of complex carbon dioxide in the invention;
FIG. 2 is a schematic diagram of a complex carbon dioxide generation module;
FIG. 3 is a schematic diagram of a short-range phase separation device;
FIG. 4 is a schematic view of a long Cheng Qitai cushioning device;
FIG. 5 is a schematic view of a press type dissolving apparatus;
wherein, the 1-complex carbon dioxide generation module; 11 short Cheng Fenxiang device; a 111 shut-off valve; 112 a humidification chamber; 113 steam/humidity generator; 12 long Cheng Qitai buffer devices; 121 long-range heat exchange tubes; 122 pressure reducing valve group; 123 gaseous buffer tanks; 13 pressure type dissolving device; 131 air storage tanks; 132 dissolving the stirring tank; 133 a pressure stabilizing valve; 2a raw material treatment module; 3, a concrete production module; 4, moving the strengthening module; 5 an external carbon source.
Detailed Description
The invention is further elucidated below in connection with the examples and the accompanying drawing. It is to be understood that these examples are for illustration of the invention only and are not intended to limit the scope of the invention. The methods of operation, under which specific conditions are not noted in the examples below, are generally in accordance with conventional conditions, or in accordance with the conditions recommended by the manufacturer.
As shown in fig. 1, the concrete building material production system based on multi-point microcrystal mineralization of composite carbon dioxide comprises a composite carbon dioxide generation module 1, a raw material treatment module 2, a concrete production module 3, a mobile reinforcement module 4 and an external carbon source 5, wherein the composite carbon dioxide generation module 1 comprises a short-range phase separation device 11, a long Cheng Qitai buffer device 12 and a pressure type dissolving device 13; short-path phase separation device 11 is used for converting liquid carbon dioxide into wet aerosol carbon dioxide, and long Cheng Qitai buffer device 12 is used for converting liquid carbon dioxide or dry aerosol carbon dioxide into gaseous carbon dioxide with stable pressure; the pressure type dissolving device 13 is used for converting gaseous carbon dioxide into dissolved carbon dioxide;
the carbon source from the external carbon source 5 is processed by the composite carbon dioxide generating module 1 and then outputs carbon dioxide in a state required by a corresponding module to the raw material processing module 2, the concrete production module 3 or the movable strengthening module 4; preparing a prefabricated building material or slurry through a raw material processing module 2 and a concrete production module 3, wherein the prefabricated building material or slurry is further used for preparing a concrete building material finished product; or the slurry prepared by the concrete production module 3 is further prepared into a concrete building material finished product by the movable strengthening module 4.
As shown in fig. 2, the short-path phase splitting device 11 comprises a stop valve 111, a humidifying chamber 112 and a steam/humidity generator 113, wherein, the liquid carbon dioxide is decompressed by the stop valve 111 to form dry aerosol carbon dioxide, which is input into the long Cheng Qitai buffer device 12 through a pipeline, or is directly input into the humidifying chamber 112 for splitting phase, and then stable wet aerosol carbon dioxide is output through a gas pipeline; the steam/humidity generator 113 is connected to the humidification chamber 112 to ensure that the inside of the humidification chamber is saturated steam and the temperature is maintained at room temperature.
The long Cheng Qitai buffer device 12 comprises a long-range heat exchange tube 121, a pressure reducing valve group 122 and a gaseous buffer tank 123 which are sequentially connected, wherein dry aerosol carbon dioxide from a stop valve 111 or liquid carbon dioxide from an external carbon source 5 enters the gaseous buffer tank 123 for pressure stabilization after heat exchange of the long-range heat exchange tube 121 and pressure reduction of the pressure reducing valve group 122, and gaseous carbon dioxide with stable pressure is output; or the gaseous carbon dioxide from the external carbon source 5 passes through the long-distance heat exchange tube 121 and the pressure reducing valve group 122 and then enters the gaseous buffer tank 123 for pressure stabilization, and the gaseous carbon dioxide with stable pressure is output;
the pressure type dissolving device 13 includes a gas tank 131, a dissolution stirring tank 132, and a pressure stabilizing valve 133, wherein gaseous carbon dioxide from the gaseous buffer tank 123 or the external carbon source 5 is injected into the dissolution stirring tank 132 filled with a solvent, pressure is applied and stirred, and dissolved carbon dioxide is output from a liquid outlet. The pressure stabilizing valve 133 ensures that the pressure inside the tank body of the dissolution stirring tank 132 is stable, and is connected to the gas buffer tank 123 via a drying device and a booster fan, thereby recovering the exhaust gas generated in the dissolution stirring tank.
Example 1
In the embodiment, the external carbon source 5 is liquid carbon dioxide (tank car, storage tank) with the pressure of 2.74MPa and 40 ℃ below zero, the pressure of the liquid carbon dioxide is regulated to be less than 0.7MPa through a stop valve 111 in a short-distance phase splitting device 11, the liquid carbon dioxide is rapidly decompressed to form dry ice, a part of the dry ice can be subjected to heat exchange sublimation in the conveying process to form gaseous carbon dioxide, and the outlet of the stop valve 111 is dry aerosol carbon dioxide; specifically, the stop valve 111 is a valve with a controllable opening, and a flowmeter is arranged at the front end of the stop valve to meter the liquid carbon dioxide.
As shown in fig. 3, the dry aerosol carbon dioxide enters the humidifying chamber 112 and is further depressurized to <0.1MPa, at this time, saturated water vapor of <0.01MPa or saturated humid air of 99% rh (temperature lower than 40 ℃) is pumped into the humidifying chamber 112, the shuttling time of the carbon dioxide in the humidifying chamber 112 is lower than 5 seconds, at this time, the water vapor or humid air condenses into liquid drops after exchanging heat with the low-temperature dry aerosol carbon dioxide and forms a gas-solid-liquid three-phase fluid (wet aerosol carbon dioxide) to be output.
It should be noted that, the temperature in the humidification chamber 112 needs to be controlled within the range of 0 to 4 ℃ to prevent the freezing of the excessively low moisture, and meanwhile, a drainage groove is provided in the humidification chamber 112 to recycle the condensed water to the steam/humidity generator 114; to ensure the safety of the humidification chamber, a safety valve is provided inside the humidification chamber 112 to prevent pressure build up.
The connecting pipeline in the short-range phase splitting device 11 uses a stainless steel hose, and a polyurethane heat insulation material with the thermal coefficient smaller than 0.15 is wrapped outside the stainless steel hose to prevent solid carbon dioxide particles in the wet aerosol carbon dioxide from heat exchange sublimation.
It should be noted that, the whole device needs to be purged and dried before and after each use of the short-range phase-splitting device 11, so as to prevent the residual moisture and dry ice in the device from blocking the pipeline and the valve block in the subsequent use process.
The wet aerosol carbon dioxide output by the embodiment can supply reactive wet aerosol carbon dioxide for the concrete production module 3 and the mobile reinforcement module 4, so as to ensure the full mineralization reaction of the carbon dioxide.
In this embodiment, taking the concrete production module 3 as an example, the influence of the system on the slurry production process and the concrete performance is described:
(1) The preparation method comprises the following steps of (1) mixing coarse aggregate, fine aggregate, cement, auxiliary cementing material and carbonation auxiliary agent according to the mass ratio of 880: 880 parts: 200 parts of: 160 parts of: adding 185 parts of water after 8 parts of water are fully mixed, and stirring in a raw material treatment module 2 to obtain uniform fresh concrete;
(2) Delivering the uniform fresh concrete into a multipoint microcrystalline mineralization reactor in a concrete production module 3, introducing wet aerosol carbon dioxide obtained in the steps from the top of the reactor, and adjusting and controlling the discharge flow to be 1.3kg-CO 2 After the reaction is completed after the stirring is continuously carried out for 90 seconds at the rotating speed of 30rpm, pasty slurry with the slump of 121mm is obtained, the initial setting time is 320 minutes, and the final setting time is 370 minutes;
(3) Injecting the paste slurry into a cubic mold with the thickness of 10mm multiplied by 10mm for sealing molding, and curing for 3 days, 7 days and 28 days respectively under natural conditions to obtain the finished product of the concrete building material, wherein the uniaxial compressive strength of the finished product of the concrete building material is 18.3MPa, 22.9MPa and 36.2MPa respectively, so that the strength requirement of C30 national standard concrete is met.
(4) The uniform freshly mixed concrete is also conveyed into a multipoint microcrystalline mineralization reactor in a concrete production module 3, carbon dioxide is not introduced, and the reaction is completed after continuous stirring is carried out for 90 seconds at the rotating speed of 30rpm, so that paste slurry with the slump of 148mm is obtained, the initial setting time is 420min, and the final setting time is 470min;
(5) Injecting the pasty slurry obtained in the step (4) into a cube mould with the thickness of 10mm multiplied by 10mm for sealing molding, and curing for 3 days, 7 days and 28 days respectively under natural conditions to obtain the concrete building material finished product with the uniaxial compressive strength of 12.6MPa, 18.7MPa and 31.9MPa respectively.
Example 2
In this example, the external carbon source 5 is liquid carbon dioxide (tank truck, storage tank) at-40 ℃ under 2.74 MPa; or the dry gas sol state carbon dioxide (-40 to minus 20 ℃ and <0.7 MPa) formed after the liquid state carbon dioxide is decompressed by the stop valve 111 is input into the long Cheng Qitai buffer device 12 through a pipeline to be used as a carbon source;
as shown in FIG. 4, one of the above two carbon sources enters the long-range heat exchange tube 121 (carbon dioxide treatment capacity 500Nm 3 And/h, stainless steel) fully exchanging heat and gasifying to form gaseous carbon dioxide, enabling the gaseous carbon dioxide after heat exchange to enter a pressure reducing valve group 122 to control the pressure to be 1.2-1.5 MPa, wherein the pressure reducing valve group 122 consists of four DN40 ball valves and two self-operated pressure regulating valves, safety valves and pressure gauges are arranged at an inlet and an outlet, and the design inlet pressure is designed to be 2.5MPa;
the gaseous carbon dioxide enters a gaseous buffer tank 123 with the design pressure of 2MPa for pressure stabilization after being decompressed, and the gaseous carbon dioxide with stable pressure is output, and specifically, the rear end of the gaseous buffer tank 123 is connected with a decompression valve with the pressure of 0-1.2 MPa.
In this embodiment, taking the concrete production module 3 as an example, the influence of the system on the production process of the prefabricated building block and the performance of the building block is described:
(1) Mixing the raw materials in the raw material treatment module 2 according to the proportion of 200 parts of fly ash, 400 parts of steel slag, 250 parts of carbide slag, 70 parts of cement and 80 parts of rice stone per ton of building block, and further pressing to obtain a mineralized maintenance building block with the size of 240mm multiplied by 115mm multiplied by 53 mm;
(2) And (3) after the building block is molded, the building block is sent into a pre-curing chamber, is pre-cured for 24 hours according to the temperature and humidity environment of 21 ℃ and 63% RH in the pre-curing chamber, is transferred into a concrete production module 3 for mineralization curing, and is subjected to the input of the gaseous carbon dioxide with stable pressure, which is prepared by the steps, to reach the preset pressure of 0.9MPa, and the mineralization curing time lasts for 4 hours, so that the prefabricated building block is obtained.
The average carbon fixation rate of the prefabricated building block is 5.7%, the water absorption rate is 11%, and the prefabricated building block reaches water absorption saturation in 48h of water. The soak performance test showed a slight increase in strength within soak 28d with no loss of strength. The compressive strength reaches 15.4MPa in 28d age, and meets the national standard strength requirement of MU 15.
Example 3
In this embodiment, the external carbon source 5 is gaseous carbon dioxide greater than 1MPa, which may be from a gaseous buffer tank 123 in the present system or other industrial sources (e.g., capture carbon dioxide from coal-fired power plants, purification carbon dioxide from coal chemical industry, capture carbon dioxide from steel plants, etc.);
as shown in fig. 5, the gaseous carbon dioxide enters the dissolution stirring tank 132 from the air inlet pipeline after being stabilized by the air storage tank 131, wherein the air inlet pipeline comprises a decompression and pressure regulation device, so that the pressure of the gaseous carbon dioxide injected into the dissolution stirring tank 132 can be accurately controlled; carbon dioxide is rapidly injected into dissolution agitation tank 132 to a specified pressure within 5 seconds and maintained at the pressure for more than 30 seconds.
Specifically, the solute in the dissolution stirring tank is water (other working media such as saturated calcium hydroxide solution, sodium hydroxide solution and the like), carbon dioxide is injected within 5 seconds and reaches 0.5MPa, and the pressure is maintained for more than 30 seconds, so that dissolved carbon dioxide with the solubility of 7.22g/L is obtained.
And after the dissolved carbon dioxide is stable, the pressure is reduced to normal pressure through a liquid outlet and then is output.
Since dissolved carbon dioxide in the dissolution stirring tank 132 is unstable and is easily decomposed, the pressure stabilizing valve 133 is provided to control the pressure in the dissolution stirring tank 132.
In addition, during and after the operation of the pressure type dissolving device 13, the surplus gas (exhaust gas) is recovered to the gas buffer tank 123 through the pressure stabilizing valve 133.
In this embodiment, taking the concrete production module 3 as an example, the influence of the system on the slurry production process and the concrete performance is described:
(1) The preparation method comprises the following steps of (1) mixing coarse aggregate, fine aggregate, cement, auxiliary cementing material and carbonation auxiliary agent according to the mass ratio of 880: 880 parts: 200 parts of: 160 parts of: the proportion of 8 parts is fully stirred and premixed in the raw material processing module 2;
(2) Conveying the premixed powder in the step (1) into a multipoint microcrystalline mineralization reactor in a concrete production module 3, introducing 185 parts of dissolved carbon dioxide obtained in the step from the top of the reactor, continuously stirring at 30rpm for 120 seconds, and then finishing the reaction to obtain pasty slurry with the slump of 161mm, wherein the initial setting time is 300min, and the final setting time is 360min;
(3) Injecting the paste obtained in the step (2) into a cubic mould with the thickness of 10mm multiplied by 10mm for sealing molding, and curing for 3 days, 7 days and 28 days respectively under natural conditions to obtain the finished product of the concrete building material, wherein the uniaxial compressive strength of the finished product of the concrete building material is 20.7MPa, 26.3MPa and 37.1MPa respectively, so that the requirement of the C35 national standard for concrete strength is met.
While the foregoing embodiments have been described in detail in connection with the embodiments of the invention, it should be understood that the foregoing embodiments are merely illustrative of the invention and are not intended to limit the invention, and any modifications, additions, substitutions and the like made within the principles of the invention are intended to be included within the scope of the invention.
Claims (10)
1. The concrete building material production system based on the multi-point microcrystalline mineralization of the composite carbon dioxide is characterized by comprising a composite carbon dioxide generation module (1), a raw material treatment module (2), a concrete production module (3) and an external carbon source (5);
the composite carbon dioxide generating module (1) comprises a short-range phase splitting device (11), a long Cheng Qitai buffer device (12) and a pressure type dissolving device (13); wherein the short-range phase-splitting device (11) is used for converting liquid carbon dioxide into wet aerosol carbon dioxide, and the long Cheng Qitai buffer device (12) is used for converting liquid carbon dioxide or dry aerosol carbon dioxide into gaseous carbon dioxide with stable pressure; the pressure type dissolving device (13) is used for converting gaseous carbon dioxide into dissolved carbon dioxide;
the carbon source from the external carbon source (5) is processed by the composite carbon dioxide generating module (1) and then outputs carbon dioxide in a state required by the corresponding module to the raw material processing module (2) or the concrete production module (3); the prefabricated building material or slurry is prepared by a raw material processing module (2) and a concrete production module (3) and is further used for preparing concrete building material finished products.
2. The concrete building material production system based on complex carbon dioxide multipoint microcrystalline mineralization according to claim 1, further comprising a mobile reinforcement module (4); the carbon source from the external carbon source (5) is processed by the composite carbon dioxide generating module (1) and then outputs carbon dioxide in a state required by the corresponding module to the raw material processing module (2), the concrete production module (3) or the movable strengthening module (4); and the movable strengthening module (4) further prepares the slurry prepared by the concrete production module (3) into a concrete building material finished product.
3. The concrete building material production system based on multi-point microcrystalline mineralization of composite carbon dioxide according to claim 1, wherein the short-range phase separation device (11) comprises a stop valve (111), a humidifying chamber (112) and a steam/humidity generator (113), and the dry aerosol carbon dioxide formed by the decompression of the liquid carbon dioxide through the stop valve (111) is input into the long Cheng Qitai buffer device (12) through a pipeline, or is input into the humidifying chamber (112) for phase separation and then outputs stable wet aerosol carbon dioxide.
4. The concrete building material production system based on the multi-point microcrystalline mineralization of the composite carbon dioxide according to claim 1, wherein the long Cheng Qitai buffer device (12) comprises a long heat exchange tube (121), a pressure reducing valve group (122) and a gas buffer tank (123) which are connected in sequence; the dry aerosol carbon dioxide from the stop valve (111) or the liquid carbon dioxide from the external carbon source (5) enters the gaseous buffer tank (123) for pressure stabilization after being subjected to heat exchange through the long-distance heat exchange tube (121) and pressure reduction through the pressure reduction valve group (122), and the gaseous carbon dioxide with stable pressure is output.
5. The concrete building material production system based on multi-point microcrystalline mineralization of composite carbon dioxide according to claim 1, characterized in that the pressure type dissolving device (13) comprises a gas storage tank (131), a dissolving stirring tank (132) and a pressure stabilizing valve (133); gaseous carbon dioxide from a gaseous buffer tank (123) or an external carbon source (5) is conveyed into a dissolution stirring tank (132) filled with solvent after being stabilized by a gas storage tank (131), pressure is applied and stirred, dissolved carbon dioxide is output, and a pressure stabilizing valve (133) ensures that the internal pressure of the dissolution stirring tank (132) is stable.
6. The concrete building material production system based on multi-point microcrystalline mineralization of composite carbon dioxide according to claim 1, wherein the raw material processing module (2) is connected with the long Cheng Qitai buffer device (12) through a pipeline; the raw material treatment module (2) receives the gaseous carbon dioxide with stable pressure output by the long Cheng Qitai buffer device (12) and pretreats the building material.
7. The composite carbon dioxide multipoint microcrystalline mineralized concrete building material production system according to claim 6, wherein the building material raw materials comprise portland cement, alkali neutral industrial solid waste, building material aggregate or carbonated active cementing material.
8. The concrete building material production system based on the multi-point microcrystalline mineralization of the composite carbon dioxide according to claim 1, wherein the concrete production module (3) is respectively connected with the short-range phase splitting device (11), the long Cheng Qitai buffer device (12) and the pressure type dissolving device (13) through pipelines; the concrete production module (3) receives the wet aerosol carbon dioxide output by the short-range phase splitting device (11), or receives the gaseous carbon dioxide with stable pressure output by the long Cheng Qitai buffer device (12), or receives the dissolved carbon dioxide output by the pressure type dissolving device (13), and the wet aerosol carbon dioxide, the gaseous carbon dioxide with stable pressure or the dissolved carbon dioxide and the building material raw materials conveyed by the raw material treatment module (2) are utilized to carry out multipoint microcrystalline mineralization reaction, so that the prefabricated building material or slurry is prepared.
9. The concrete building material production system based on complex carbon dioxide multipoint microcrystalline mineralization according to claim 2, wherein the mobile strengthening module (4) is connected with the short-range phase splitting device (11) and the pressure type dissolving device (13) through pipelines respectively; the movable strengthening module (4) receives the wet aerosol carbon dioxide output by the short-range phase splitting device (11) or receives the dissolved carbon dioxide output by the pressure type dissolving device (13) to carry out multipoint microcrystalline mineralization reaction on the slurry and the wet aerosol carbon dioxide or the dissolved carbon dioxide so as to prepare a finished product of the concrete building material.
10. The concrete building material production system based on multi-point microcrystalline mineralization of composite carbon dioxide according to claim 2, wherein the movable strengthening module (4) is a concrete mixer truck.
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