System for multi-stage mineralization curing of building materials by using tail gas of industry

Abstract

The utility model provides a kind of multi-stage mineralization curing building material system using tail industrial flue gas, belong to carbon emission reduction and solid waste resource utilization field, including industrial flue gas CO2 primary regulator, first air compressor, concrete slurry primary mineralization pool / container, and one side of the concrete slurry primary mineralization pool / container is equipped with forming demoulding system, industrial flue gas CO2 secondary regulator, second air compressor, second air compressor pipeline connection industrial flue gas CO2 curing kiln, the utility model aims at the problems of low utilization rate of industrial flue gas and low carbon fixation rate of building material, based on the preparation process of non-burned building material, a multi-stage mineralization curing building material system using tail industrial flue gas is developed, and it is proposed to use CO2 in industrial flue gas for multiple multi-stage mineralization curing in the whole process of building material preparation, so as to improve the carbon fixation rate of conventional building material and strengthen the mechanical strength of building material. The implementation of the utility model can realize low-carbon production of building material and effectively reduce carbon emission of industrial flue gas.

Description

Technical Field

[0001] This invention belongs to the field of carbon emission reduction and solid waste resource utilization technology, specifically relating to a multi-stage mineralization and maintenance system for building materials using tail-end industrial flue gas. Background Technology

[0002] Currently, industrial flue gas, even after desulfurization and denitrification pretreatment, still contains large amounts of water vapor, carbon dioxide, and small amounts of sulfur dioxide. Direct discharge of these gases not only causes environmental pollution and a localized greenhouse effect but also represents a waste of resources. The use of CO2 gas for mineralization and curing of building materials has attracted industry attention; however, problems such as low utilization rates of industrial flue gas and poor CO2 fixation efficiency of building materials remain to be solved. Therefore, designing an equipment system for mineralizing and curing building materials using industrial flue gas is of great practical significance.

[0003] Currently, there are few research and patent reports on equipment and systems for CO2 mineralization curing of building materials. The domestic patent for a concrete component mineralization curing system (application number: CN202311219064.6) includes a carbon dioxide gas source, a curing tank, and a carbon dioxide gas conditioning and storage chamber. This invention recovers and stores the remaining carbon dioxide gas after the mineralization reaction, adjusts the pressure and concentration, and then recycles it, thereby improving the utilization rate by reducing the escape of carbon dioxide gas.

[0004] A domestic patent for a device and method for CO2 mineralization curing of concrete blocks (application number: CN202110990219.0) accelerates the flow and disturbance of flue gas by pressurization, compensating for insufficient CO2 concentration in the center of the block, and increasing the probability and efficiency of mineralization reaction in the center of the block; it can continuously introduce flue gas to compensate for insufficient CO2 concentration and partial pressure in the later stage of mineralization reaction, effectively solving the shortcomings of direct mineralization curing by flue gas, and moisturizing the mineralization environment in the later stage of mineralization reaction.

[0005] A domestic patent describes a method and system for continuous curing of building materials using programmed carbon dioxide curing (application number: CN202210103045.6). This method uses continuous pressurization and depressurization to perform CO2 curing on the building materials in the curing vessel in order to improve the effective utilization rate of the curing vessel.

[0006] Currently, the innovations in relevant domestic research and patents are concentrated on improving the carbon fixation rate and efficiency of building materials by changing the pressure and concentration of CO2 gas inside the curing tank. No patent literature reports have been found on the entire process equipment system involved in the mineralization curing of building materials by directly utilizing tail-end industrial flue gas. Summary of the Invention

[0007] The purpose of this invention is to provide a multi-stage mineralization curing system for building materials using exhaust industrial flue gas, in order to solve the problems mentioned in the background art.

[0008] To achieve the above objectives, the present invention provides the following technical solution: a multi-stage mineralization curing system for building materials using exhaust industrial flue gas, comprising an industrial flue gas CO2 primary regulator, wherein the industrial flue gas inlet of the industrial flue gas CO2 primary regulator is connected to the exhaust gas emission tower via a pipeline, the industrial flue gas outlet pipeline of the industrial flue gas CO2 primary regulator is connected to the inlet of a first air compressor, the outlet pipeline of the first air compressor is connected to the CO2 raw material gas inlet of the mineralization chamber of a primary mineralization tank / concrete slurry, a precast concrete component production line is installed on one side of the primary mineralization tank / concrete slurry for molding and demolding the mineralized concrete, the mineralization recovery gas outlet pipeline of the primary mineralization tank / concrete slurry is connected to the recovery gas inlet of a secondary industrial flue gas CO2 regulator, the CO2 outlet pipeline of the secondary industrial flue gas CO2 regulator is connected to the inlet of a second air compressor, the outlet pipeline of the second air compressor is connected to the CO2 inlet pipe of the industrial flue gas CO2 curing kiln, and the industrial flue gas CO2 curing kiln is used for CO2 curing of the molds produced by the precast concrete component production line.

[0009] Preferably, the industrial flue gas CO2 primary regulator includes a primary regulator body, which is a three-chamber interconnection. The lower end of the primary regulator body is fixedly connected to the industrial flue gas inlet, the industrial flue gas inlet pipe is connected to the tail gas emission tower, a buffer net is installed inside the primary regulator body, the upper end of the primary regulator body is fixedly connected to the industrial flue gas outlet, and a homogenizer is provided inside the primary regulator body.

[0010] Preferably, the primary mineralization tank / device for concrete slurry includes a slurry mixing mechanism and a primary mineralization tank / device. The slurry mixing mechanism is connected to the primary mineralization tank / device via a pipeline. The slurry mixing mechanism includes a slurry silo body. A raw material inlet is fixedly connected to the left side of the slurry silo body, and a raw material outlet is fixedly connected to the right side of the slurry silo body. A slurry silo agitator is installed inside the slurry silo body.

[0011] Preferably, the primary mineralization tank / device includes a mineralization chamber, a slurry inlet fixedly connected to the left side of the mineralization chamber, a raw material outlet pipe connected to the slurry inlet, a slurry outlet fixedly connected to the lower right side of the mineralization chamber, through which mineralized concrete is transported to the precast concrete component production line, a water inlet fixedly connected to the upper right side of the mineralization chamber, a CO2 raw material gas inlet for the mineralization chamber is provided at the bottom of the mineralization chamber, multiple sets of CO2 raw material gas inlets are provided and evenly distributed at the bottom of the mineralization chamber, the diameter of the CO2 raw material gas inlet pipe is not less than 100mm, a mineralization recovery gas outlet is provided at the top of the mineralization chamber, multiple sets of mineralization recovery gas outlets are provided and evenly distributed on the top surface of the mineralization chamber, a mineralization chamber agitator is installed inside the mineralization chamber, and a pH activity calcium oxide tester is installed on the lower left side of the mineralization chamber.

[0012] Preferably, the industrial flue gas CO2 secondary regulator includes a secondary regulator body, with a recovery gas inlet at the lower end of the secondary regulator body. The secondary regulator body is a three-chamber interconnection structure. A CO2 raw material gas inlet is fixedly connected to the lower right side of the secondary regulator body, and a CO2 outlet is fixedly connected to the upper left side of the secondary regulator body. The CO2 outlet pipe is connected to a second air compressor. A secondary regulator circulating water inlet is fixedly connected to the upper right side of the secondary regulator body, and a secondary regulator circulating water outlet is fixedly connected to the lower part of the secondary regulator body. A coil-type heat exchanger is installed inside the secondary regulator body, and the coil-type heat exchanger includes a process water pipe inlet installed above the secondary regulator body. The process water pipeline inlet is fixedly connected to the process water heat exchange pipeline, and the process water heat exchange pipeline is fixedly connected to the process water pipeline outlet. The process water pipeline outlet is installed below the secondary regulator body. The secondary regulator body is equipped with a secondary regulator homogenizer. A temperature and humidity transmitter is installed on one side of the upper part of the secondary regulator body. The detection signal of the temperature and humidity transmitter is used to control the water flow rate of the secondary regulator circulating water inlet and the coil heat exchanger to regulate the temperature and humidity inside the secondary regulator body. A CO2 concentration sensor is also installed in the secondary regulator body. The detection signal of the CO2 concentration sensor is used to control the CO2 feed gas inlet to regulate the CO2 concentration inside the secondary regulator body.

[0013] Preferably, the industrial flue gas CO2 curing kiln includes a kiln body. Multiple kiln body CO2 inlet pipes are fixedly installed at the lower part of the kiln body. Each kiln body CO2 inlet pipe has multiple evenly spaced outlet holes, each with a diameter of not less than mm. A kiln body CO2 outlet pipe is fixedly connected to the upper part of the kiln body and is connected to a recovery gas inlet. The distance between any two adjacent kiln body CO2 inlet pipes and the distance between any two adjacent kiln body CO2 outlet pipes are both less than 100m. A water tank is provided at the lower part of the kiln body cavity, and a circulating sprayer is installed below the water tank. A heat exchanger is installed on the inner wall of the kiln body. A kiln body temperature and humidity sensor is installed on the upper right side of the kiln body. The temperature and humidity inside the kiln body detected by the kiln body temperature and humidity sensor are used to control the operation of the circulating sprayer and the heat exchanger, thereby achieving the regulation of the temperature and humidity inside the kiln body. A liquid level monitoring instrument is installed at the bottom of the kiln body, and a condensate drain outlet is provided at the bottom of the kiln body. A condensate drain valve is installed on the condensate drain outlet.

[0014] Preferably, the circulating sprayer includes a water tank outlet pipe installed below the water tank, the other end of the water tank outlet pipe is connected to a circulating pump, the circulating pump is connected to a water vapor circulation pipe, the outer layer of the water vapor circulation pipe is provided with a heat insulation layer and a heat tracing cable, and the other end of the water vapor circulation pipe is equipped with an atomizing nozzle, which is located inside the kiln body above.

[0015] Compared with the prior art, the beneficial effects of the present invention are:

[0016] To address the issues of poor utilization of industrial flue gas and low carbon sequestration rate of building materials, this invention develops a multi-stage mineralization and curing system for building materials based on the non-fired building material preparation process. It proposes utilizing CO2 from industrial flue gas for multiple stages of mineralization and curing throughout the entire building material preparation process, thereby improving the carbon sequestration rate and enhancing the mechanical strength of conventional building materials. The implementation of this invention can achieve low-carbon production of building materials and effectively reduce carbon emissions from industrial flue gas. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the multi-stage mineralization and curing building material system for industrial flue gas tail-end of the present invention.

[0018] Figure 2 This is a schematic diagram of the industrial flue gas CO2 primary regulator of the present invention.

[0019] Figure 3 This is a schematic diagram of the primary mineralization tank / device for the concrete slurry of the present invention.

[0020] Figure 4 This is a schematic diagram of the industrial flue gas CO2 two-stage regulator of the present invention.

[0021] Figure 5 This is a schematic diagram of the industrial flue gas CO2 curing kiln of the present invention.

[0022] In the diagram: 1. Primary CO2 regulator for industrial flue gas; 11. Primary regulator body; 12. Industrial flue gas inlet; 13. Buffer screen; 14. Industrial flue gas outlet; 15. Homogenizer; 2. First air compressor; 3. Primary mineralization tank / device for concrete slurry; 31. Slurry mixing mechanism; 311. Main body of slurry silo; 312. Raw material inlet; 313. Raw material outlet; 314. Slurry silo agitator; 32. Primary mineralization tank / device; 321. Mineralization silo; 322. Slurry inlet; 323. Slurry outlet; 324. Mineralization silo water inlet; 325. CO2 raw material gas inlet of mineralization silo; 326. Mineralization recovery gas outlet; 327. Mineralization silo agitator; 328. pH active calcium oxide tester; 4. Concrete precast component production line; 5. Secondary CO2 regulator for industrial flue gas; 51. Secondary regulator body; 52. Recovery gas inlet; 5 3. CO2 feed gas inlet; 54. CO2 outlet; 55. Secondary regulator circulating water inlet; 56. Secondary regulator circulating water outlet; 57. Coil heat exchanger; 571. Process water pipeline inlet; 572. Process water heat exchange pipeline; 573. Process water pipeline outlet; 58. Secondary regulator homogenizer; 59. Temperature and humidity transmitter; 6. Secondary air compressor; 7. Industrial flue gas CO2 curing kiln; 71. Kiln body 72. Kiln CO2 inlet pipe; 73. Kiln CO2 outlet pipe; 74. Water tank; 75. Circulating sprayer; 751. Water tank outlet pipe; 752. Circulating pump; 753. Water vapor circulation pipe; 754. Atomizing nozzle; 76. Heat exchanger; 77. Kiln temperature and humidity sensing device; A. Tail gas emission tower; B. Heating pan water circulation line; C. Makeup water line; D. Concrete processing line; F. Spray water circulation line. Detailed Implementation

[0023] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0024] In the description of this invention, it should be noted that the terms "upper," "lower," "inner," "outer," "front end," "rear end," "both ends," "one end," and "the other end," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0025] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0026] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0027] Please see Figure 1-5 One embodiment of the present invention provides a multi-stage mineralization curing system for building materials using exhaust industrial flue gas, comprising an industrial flue gas CO2 primary regulator 1, wherein the industrial flue gas inlet 12 of the industrial flue gas CO2 primary regulator 1 is connected to the exhaust gas emission tower via a pipeline, the industrial flue gas outlet 14 of the industrial flue gas CO2 primary regulator 1 is connected to the inlet of a first air compressor 2 via a pipeline, the outlet pipeline of the first air compressor 2 is connected to the CO2 raw material gas inlet 325 of the mineralization chamber of the primary mineralization tank / device of concrete slurry 3, and a concrete pre-concrete mixture is installed on one side of the primary mineralization tank / device of concrete slurry 3. The precast concrete component production line 4 is used to mold and demold the mineralized concrete. The mineralization recovery gas outlet 326 on the primary mineralization tank / device 3 of the concrete slurry is connected to the recovery gas inlet 52 of the industrial flue gas CO2 secondary regulator 5. The CO2 outlet 54 of the industrial flue gas CO2 secondary regulator 5 is connected to the inlet of the second air compressor 6. The outlet pipe of the second air compressor 6 is connected to the CO2 inlet pipe 72 of the industrial flue gas CO2 curing kiln 7. The industrial flue gas CO2 curing kiln 7 is used to CO2 cure the molds produced by the precast concrete component production line 4.

[0028] Furthermore, the industrial flue gas CO2 primary regulator 1 includes a primary regulator body 11, which is a three-chamber interconnection. The lower end of the primary regulator body 11 is fixedly connected to the industrial flue gas inlet 12, and the industrial flue gas inlet 12 is piped to the tail gas emission tower. A buffer net 13 is installed inside the primary regulator body 11, and the upper end of the primary regulator body 11 is fixedly connected to the industrial flue gas outlet 14. A homogenizer 15 is installed inside the primary regulator body 11, which can pre-treat the system flue gas, filter impurities in the system flue gas, and perform flue gas homogenization.

[0029] Furthermore, the primary mineralization tank / device 3 for concrete slurry includes a slurry mixing mechanism 31 and a primary mineralization tank / device 32. The slurry mixing mechanism 31 is connected to the primary mineralization tank / device 32 through a pipeline. The slurry mixing mechanism 31 includes a slurry silo body 311. The left side of the slurry silo body 311 is fixedly connected to the raw material inlet 312, and the right side of the slurry silo body 311 is fixedly connected to the raw material outlet 313. The slurry silo body 311 is equipped with a slurry mixing chamber agitator 314, which can pre-process the concrete slurry.

[0030] Furthermore, the primary mineralization tank / device 32 includes a mineralization chamber 321. A slurry inlet 322 is fixedly connected to the left side of the mineralization chamber 321, and a raw material outlet 313 is piped to the slurry inlet 322. A slurry outlet 323 is fixedly connected to the lower right side of the mineralization chamber 321, through which mineralized concrete is conveyed to the precast concrete production line 4. A mineralization chamber water inlet 324 is fixedly connected to the upper right side of the mineralization chamber 321. A mineralization chamber CO2 raw material gas inlet 325 is opened at the bottom of the mineralization chamber 321. Multiple sets of gas inlets 325 are evenly distributed at the bottom of the mineralization chamber 321. The diameter of the CO2 raw material gas inlet 325 is not less than 100mm. A mineralization recovery gas outlet 326 is opened at the top of the mineralization chamber 321. Multiple sets of mineralization recovery gas outlets 326 are evenly distributed on the top surface of the mineralization chamber 321. A mineralization chamber agitator 327 is installed inside the mineralization chamber 321. A pH activity calcium oxide tester 328 is installed on the lower left side of the mineralization chamber 321, so that the concrete slurry and flue gas can undergo the initial mineralization reaction.

[0031] Furthermore, the industrial flue gas CO2 secondary regulator 5 includes a secondary regulator body 51. A recovery gas inlet 52 is provided at the lower end of the secondary regulator body 51. The secondary regulator body 51 adopts a three-chamber interconnection. The CO2 raw material gas inlet 53 is fixedly connected to the lower right side of the secondary regulator body 51, and the CO2 outlet 54 is fixedly connected to the upper left side of the secondary regulator body 51. The CO2 outlet 54 is piped to the second air compressor 6. The secondary regulator circulating water inlet 55 is fixedly connected to the upper right side of the secondary regulator body 51, and the secondary regulator circulating water outlet 56 is fixedly connected to the lower part of the secondary regulator body 51. A coil heat exchanger 57 is installed inside the secondary regulator body 51. The coil heat exchanger 57 includes a process water pipeline inlet 571 installed above the secondary regulator body 51, and the process water pipeline inlet 571 is fixedly connected to the process water heat exchange pipeline 57. 2. The process water heat exchange pipe 572 is fixedly connected to the process water pipe outlet 573. The process water pipe outlet 573 is installed below the secondary regulator body 51. The secondary regulator body 51 is equipped with a secondary regulator homogenizer 58. A temperature and humidity transmitter 59 is installed on one side of the upper part of the secondary regulator body 51. The detection signal of the temperature and humidity transmitter 59 is used to control the water flow of the secondary regulator circulating water inlet 55 and the coil heat exchanger 57 to regulate the temperature and humidity inside the secondary regulator body 51. A CO2 concentration sensor is also installed in the secondary regulator body 51. The detection signal of the CO2 concentration sensor is used to control the air flow of the CO2 raw material gas inlet 53 to regulate the CO2 concentration inside the secondary regulator body 51. This can achieve the replenishment of flue gas, increase the recycling of flue gas, reduce emissions, and control the temperature of flue gas.

[0032] Furthermore, the industrial flue gas CO2 curing kiln 7 includes a kiln body 71. Multiple kiln body CO2 inlet pipes 72 are fixedly installed at the lower part of the kiln body 71. Each kiln body CO2 inlet pipe 72 has multiple evenly spaced outlet holes, each with a diameter of not less than 8mm. A kiln body CO2 outlet pipe 73 is fixedly connected to the upper part of the kiln body 71. The kiln body CO2 outlet pipe 73 is connected to the recovery gas inlet 52. The distance between any two adjacent kiln body CO2 inlet pipes 72 and the distance between any two adjacent kiln body CO2 outlet pipes 73 are both less than 10m. A water tank 74 is installed at the lower part of the inner cavity of the kiln body 71, and a circulating gas system is installed below the water tank 74. The kiln body 71 is equipped with a sprayer 75 and a heat exchanger 76. A kiln body temperature and humidity sensor 77 is installed on the upper right side of the kiln body 71. The temperature and humidity inside the kiln body 71 are detected by the kiln body temperature and humidity sensor 77, which controls the operation of the circulating sprayer 75 and the heat exchanger 76 to regulate the temperature and humidity inside the kiln body 71. A liquid level monitoring instrument is installed at the bottom of the kiln body 71, and a condensate drain outlet is installed at the bottom of the kiln body 71. A condensate drain valve is installed on the condensate drain outlet, which can effectively control the temperature and humidity of the kiln body 71, better promote the curing of concrete building materials, and recycle and reuse flue gas, making it more environmentally friendly.

[0033] Furthermore, the circulating sprayer 75 includes a water tank outlet pipe 751 installed below the water tank 74. The other end of the water tank outlet pipe 751 is connected to a circulating pump 752. The circulating pump 752 is connected to a water vapor circulation pipe 753. The water vapor circulation pipe 753 is provided with an insulation layer and a heat tracing cable. The other end of the water vapor circulation pipe 753 is equipped with an atomizing nozzle 754. The atomizing nozzle 754 is located inside and above the kiln body 71, realizing the circulation of spray water, which is more environmentally friendly.

[0034] A method for using a multi-stage mineralization curing system for building materials using exhaust industrial flue gas includes the following steps:

[0035] This system is installed at the tail end of the flue gas emission tower of a coal-fired power plant. The exhaust gas first passes through the industrial flue gas CO2 primary regulator 1, and then is introduced into the primary mineralization tank / device 3 of concrete slurry through the flue using the first air compressor 2. This process performs primary mineralization on the concrete slurry in the primary mineralization tank / device 3, effectively increasing the number of calcium carbonate crystal nuclei in the concrete slurry. The primary mineralized slurry is then injected into a mold for building material forming. Excess flue gas from the primary mineralization tank 32 enters the industrial flue gas CO2 secondary regulator 5 through the flue. After the CO2 concentration, temperature, and humidity of the flue gas are adjusted by the industrial flue gas CO2 secondary regulator 5, it is pressurized by the second air compressor 6 and enters the industrial flue gas CO2 curing kiln 7 from the bottom. A circulating sprayer 75 is installed at the top of the kiln, and a circulating water tank 74 is installed at the bottom of the kiln. These can be used for spray water replenishment in the curing kiln and for humidity regulation by the industrial flue gas CO2 secondary regulator 5. Excess water in the circulating water tank 74 is pumped into the water vapor circulation pipe 753 by the circulating pump 752 for reuse.

[0036] Working principle: Based on the production process of solid waste-based building materials using industrial solid waste (including but not limited to fly ash, steel slag, carbide slag, etc.), ordinary Portland cement, foaming agent and water as raw materials, the tail-end industrial flue gas is introduced during the slurry preparation process. The CO2 in the flue gas reacts with some of the calcium ions in the solid waste slurry to undergo a mineralization reaction. The size and crystal shape of calcium carbonate crystals are controlled by process parameters to obtain an appropriate amount of calcium carbonate seed crystals. This mineralization reaction is accompanied by a gelation reaction. The time point corresponding to the intersection of the two reaction processes is the stop time of this process. Subsequently, a foaming agent is added to the slurry, stirred evenly, and poured into a mold. The slurry is then transferred to the primary mineralization tank / device 3 for primary curing. After the module is formed, it is demolded and cut into test blocks. At this point, calcium carbonate seed crystals are evenly distributed in the test blocks. Finally, the test blocks are stacked and transferred to the industrial flue gas CO2 curing kiln 7, where industrial flue gas is introduced for mineralization curing. During this process, the gelation reaction continues, and CO2 in the environment dissolves in water to produce carbonate ions. The carbonate ions react with calcium ions in the pores of the test blocks to form calcium carbonate precipitate. Since the calcium carbonate generated in the primary mineralization process acts as a seed crystal inside the test block, it has an inducing effect on the calcium carbonate crystals generated at this time. Therefore, the calcium carbonate crystals generated at this time preferentially attach to the seed crystals and crystallize, growing from the inside of the pores to the edges, filling the pore channels of the test block, and improving the carbon sequestration rate and strength of the solid waste-based building material. This invention improves upon the problem of partial blockage of the pore surface of test blocks in conventional mineralization curing processes that lack primary mineralization. Furthermore, calcium carbonate generated under CO2 concentrations in the curing chamber is unlikely to undergo a calcium bicarbonate reaction and be destroyed under low-concentration CO2 conditions in the air. Therefore, this invention provides a supporting process flow and system for multi-stage mineralization curing of building materials using industrial flue gas, offering equipment support for significantly improving and enhancing the carbon sequestration efficiency and strength of solid waste-based building materials.

[0037] The above descriptions are merely embodiments of the present invention, and common knowledge regarding specific structures and characteristics of the solutions is not described in detail here. It will be apparent to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiments, and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the present invention is defined by the appended claims rather than the foregoing description. Therefore, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A multi-stage mineralization curing system for building materials using industrial flue gas tail gas, characterized in that, The system includes an industrial flue gas CO2 primary regulator (1), the industrial flue gas inlet (12) of which is connected to the tail gas emission tower via a pipeline, the industrial flue gas outlet (14) of which is connected to the inlet of a first air compressor (2) via a pipeline, and the outlet pipeline of the first air compressor (2) is connected to the CO2 raw material gas inlet (325) of the primary mineralization tank / device of concrete slurry (3). A precast concrete component production line (4) is installed on one side of the primary mineralization tank / device of concrete slurry (3) for processing the mineralized concrete. The concrete slurry primary mineralization tank / device (3) has a mineralization recovery gas outlet (326) pipe connected to the recovery gas inlet (52) of the industrial flue gas CO2 secondary regulator (5), and the CO2 outlet (54) pipe of the industrial flue gas CO2 secondary regulator (5) is connected to the inlet of the second air compressor (6). The outlet pipe of the second air compressor (6) is connected to the CO2 inlet pipe (72) of the industrial flue gas CO2 curing kiln (7). The industrial flue gas CO2 curing kiln (7) is used to CO2 cure the molds produced by the concrete precast component production line (4). The industrial flue gas CO2 primary regulator (1) includes a primary regulator body (11), which is a three-chamber interconnection. The lower end of the primary regulator body (11) is fixedly connected to the industrial flue gas inlet (12), and the industrial flue gas inlet (12) is piped to the tail gas emission tower. A buffer net (13) is installed inside the primary regulator body (11), and the upper end of the primary regulator body (11) is fixedly connected to the industrial flue gas outlet (14). A homogenizer (15) is installed inside the primary regulator body (11). The industrial flue gas CO2 secondary regulator (5) includes a secondary regulator body (51), with a recovery gas inlet (52) at the lower end of the secondary regulator body (51). The secondary regulator body (51) is a three-chamber interconnection structure. A CO2 raw material gas inlet (53) is fixedly connected to the lower right side of the secondary regulator body (51), and a CO2 outlet (54) is fixedly connected to the upper left side of the secondary regulator body (51). The CO2 outlet (54) is piped to a second air compressor (6). A secondary regulator circulating water inlet (55) is fixedly connected to the upper right side of the secondary regulator body (51), and a secondary regulator circulating water outlet (56) is fixedly connected to the lower part of the secondary regulator body (51). A coil heat exchanger (57) is installed inside the secondary regulator body (51), and a process water pipeline inlet (571) is installed above the secondary regulator body (51). The process water pipeline inlet (571) is fixedly connected to the process water heat exchange pipeline (572), and the process water heat exchange pipeline (572) is fixedly connected to the process water pipeline outlet (573). The process water pipeline outlet (573) is installed below the secondary regulator body (51). The secondary regulator body (51) is equipped with a secondary regulator homogenizer (58). A temperature and humidity transmitter (59) is installed on one side above the secondary regulator body (51). The detection signal of the temperature and humidity transmitter (59) is used to control the water flow of the secondary regulator circulating water inlet (55) and the coil heat exchanger (57) to regulate the temperature and humidity inside the secondary regulator body (51). A CO2 concentration sensor is also installed in the secondary regulator body (51). The detection signal of the CO2 concentration sensor is used to control the air flow of the CO2 raw material gas inlet (53) to regulate the CO2 concentration inside the secondary regulator body (51). The industrial flue gas CO2 curing kiln (7) includes a kiln body (71). Multiple kiln body CO2 inlet pipes (72) are fixedly installed at the lower part of the kiln body (71). Each kiln body CO2 inlet pipe (72) has multiple evenly spaced outlet holes, each with a diameter of not less than 8 mm. A kiln body CO2 outlet pipe (73) is fixedly connected to the upper part of the kiln body (71). The kiln body CO2 outlet pipe (73) is connected to a recovery gas inlet (52). The distance between any two adjacent kiln body CO2 inlet pipes (72) and the distance between any two adjacent kiln body CO2 outlet pipes (73) are both less than 10 m. The inner cavity of the kiln body (71) A water tank (74) is provided at the bottom of the kiln body (71), and a circulating sprayer (75) is installed below the water tank (74). A heat exchanger (76) is installed on the inner wall of the kiln body (71). A kiln body temperature and humidity sensor (77) is installed on the upper right side of the kiln body (71). The temperature and humidity inside the kiln body (71) are detected by the kiln body temperature and humidity sensor (77), and the circulating sprayer (75) and the heat exchanger (76) are linked to control the operation, thereby realizing the regulation of the temperature and humidity inside the kiln body (71). A liquid level monitoring instrument is provided at the bottom of the kiln body (71), and a condensate drain outlet is provided at the bottom of the kiln body (71). A condensate drain valve is provided on the condensate drain outlet.

2. The multi-stage mineralization curing system for building materials using exhaust industrial flue gas as described in claim 1, characterized in that: The primary mineralization tank / device (3) for concrete slurry includes a slurry mixing mechanism (31) and a primary mineralization tank / device (32). The slurry mixing mechanism (31) is connected to the primary mineralization tank / device (32) through a pipe. The slurry mixing mechanism (31) includes a slurry silo body (311). The slurry silo body (311) has a raw material inlet (312) fixedly connected to its left side and a raw material outlet (313) fixedly connected to its right side. A slurry silo agitator (314) is installed inside the slurry silo body (311).

3. The multi-stage mineralization curing system for building materials using tail-end industrial flue gas according to claim 2, characterized in that: The primary mineralization tank / device (32) includes a mineralization chamber (321). A slurry inlet (322) is fixedly connected to the left side of the mineralization chamber (321). A raw material outlet (313) is piped to the slurry inlet (322). A slurry outlet (323) is fixedly connected to the lower right side of the mineralization chamber (321). Mineralized concrete is transported to the precast concrete production line (4) through the slurry outlet (323). A mineralization chamber water inlet (324) is fixedly connected to the upper right side of the mineralization chamber (321). A mineralization chamber CO2 raw material gas inlet (324) is opened at the bottom of the mineralization chamber (321). 5) The CO2 raw material gas inlet (325) of the mineralization chamber is provided in multiple sets and evenly distributed at the bottom of the mineralization chamber (321). The inlet pipe diameter of the CO2 raw material gas inlet (325) of the mineralization chamber is not less than 100mm. A mineralization recovery gas outlet (326) is provided at the top of the mineralization chamber (321). The mineralization recovery gas outlet (326) is provided in multiple sets and evenly distributed on the top surface of the mineralization chamber (321). A mineralization chamber agitator (327) is installed inside the mineralization chamber (321). A pH activity calcium oxide tester (328) is installed on the lower left side of the mineralization chamber (321).

4. The multi-stage mineralization curing system for building materials using exhaust industrial flue gas according to claim 1, characterized in that: The circulating sprayer (75) includes a water tank outlet pipe (751) installed below the water tank (74), the other end of the water tank outlet pipe (751) is connected to a circulating pump (752), the circulating pump (752) is connected to a water vapor circulation pipe (753), the outer layer of the water vapor circulation pipe (753) is provided with a heat insulation layer and a heat tracing cable, and the other end of the water vapor circulation pipe (753) is equipped with an atomizing nozzle (754), which is located inside the kiln body (71) above.

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