System for multi-stage mineralization maintenance of building materials by utilizing tail-discharged industrial flue gas

Abstract

A multi-stage mineralization maintenance building material system utilizing tail-discharged industrial flue gas belongs to the field of carbon emission reduction and solid waste resource utilization, and comprises an industrial flue gas CO2 first-stage regulator, a first air compressor and a concrete slurry primary mineralization pool / device, one side of the concrete slurry primary mineralization pool / device is provided with a forming demolding system and an industrial flue gas CO2 second-stage regulator, and the other side of the concrete slurry primary mineralization pool / device is provided with an industrial flue gas CO2 second-stage regulator. In order to solve the problems that the utilization rate of industrial flue gas is poor and the carbon sequestration rate of building materials is low, the invention develops a system for multi-stage mineralization maintenance of building materials by using tail-discharged industrial flue gas based on a preparation process of unfired building materials. According to the method, CO2 in the industrial flue gas is utilized to perform multi-time multi-stage mineralization maintenance in the whole preparation process of the building material, so that the carbon sequestration rate of the conventional building material is increased, the mechanical strength of the building material is enhanced, low-carbon production of the building material can be realized, and carbon emission of the industrial flue gas can be effectively reduced.

Description

Technical Field

[0001] The present invention belongs to the technical field of carbon emission reduction and solid waste resource utilization, and specifically relates to a multi-stage mineralization and maintenance system for building materials using tail exhaust industrial flue gas. Background Art

[0002] At present, industrial flue gas after desulfurization and denitrification pretreatment still contains a large amount of water vapor, carbon dioxide and a small amount of sulfur dioxide. Direct discharge not only causes environmental pollution and small regional greenhouse effect, but also a waste of resources. The use of CO2 gas for mineralization and curing of building materials has attracted attention from the industry, but there are still problems such as low utilization rate of industrial flue gas and poor efficiency of building materials in fixing CO2 that need to be solved. Therefore, it is of great practical significance to design an equipment system for mineralization and curing building materials with tail-discharge industrial flue gas.

[0003] At present, there are few relevant research and patent reports on equipment and systems for CO2 mineralization curing building materials. The domestic patented concrete component mineralization curing system (application number: CN202311219064.6) includes a carbon dioxide gas source, a curing kettle and a carbon dioxide gas regulating and storage chamber. The invention recovers and stores the remaining carbon dioxide gas after the mineralization reaction, and recycles it after adjusting the pressure concentration, 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 concrete blocks (application number: CN202110990219.0) accelerates the flow and disturbance of flue gas by pressurizing, compensates for the insufficient CO2 concentration in the center of the block, and increases the probability and efficiency of the mineralization reaction in the center of the block; it can continuously introduce flue gas to compensate for the insufficient CO2 concentration and partial pressure in the later stage of the mineralization reaction, effectively solve the shortcomings of direct mineralization curing of flue gas, and humidify the mineralization environment in the later stage of the mineralization reaction.

[0005] A domestic patent for a continuous curing method and system for programmed carbon dioxide curing of building materials (application number: CN202210103045.6) uses CO2 curing of building materials in a curing kettle by continuously increasing and decreasing pressure in order to improve the effective utilization rate of the curing kettle.

[0006] At present, the innovative points of relevant domestic research content and patents are concentrated on achieving the carbon fixation rate and efficiency of building materials by changing the pressure and concentration of CO2 gas in the curing kettle equipment. No patent literature reports have been found on the full-process equipment system involved in the mineralization curing of the whole process of building material preparation directly using tail exhaust industrial flue gas. Summary of the invention

[0007] The purpose of the present invention is to provide a multi-stage mineralization and curing building material system using tail exhaust industrial flue gas to solve the problems raised in the above background technology.

[0008] To achieve the above-mentioned purpose, the present invention provides the following technical scheme: a system for curing building materials by multi-stage mineralization of tail exhaust industrial flue gas, comprising an industrial flue gas CO2 primary regulator, the industrial flue gas inlet of the industrial flue gas CO2 primary regulator being connected to a tail gas emission tower through a pipeline, the industrial flue gas outlet pipeline of the industrial flue gas CO2 primary regulator being connected to the inlet of a first air compressor, the outlet pipeline of the first air compressor being connected to the CO2 raw gas inlet of a mineralization bin of a concrete slurry primary mineralization pool / device, a concrete prefabricated component production line being installed on one side of the concrete slurry primary mineralization pool / device for molding and demolding the mineralized concrete, the mineralization recovery gas outlet pipeline on the concrete slurry primary mineralization pool / device being connected to the recovery gas inlet of an industrial flue gas CO2 secondary regulator, the CO2 outlet pipeline of the industrial flue gas CO2 secondary regulator being connected to the inlet of a second air compressor, the outlet pipeline of the second air compressor being connected to the kiln body CO2 air inlet pipe of an industrial flue gas CO2 curing kiln, and the industrial flue gas CO2 curing kiln being used for CO2 curing molds produced by the concrete prefabricated component production line.

[0009] Preferably, the industrial flue gas CO2 first-stage regulator includes a first-stage regulator body, the first-stage regulator body is connected by three cavities, the lower end of the first-stage regulator body is fixedly connected to the industrial flue gas inlet, the industrial flue gas inlet pipe is connected to the exhaust gas emission tower, a buffer net is installed inside the first-stage regulator body, the upper end of the first-stage regulator body is fixedly connected to the industrial flue gas outlet, and a homogenizer is arranged inside the first-stage regulator body.

[0010] Preferably, the concrete slurry primary mineralization tank / device includes a slurry stirring mechanism and a primary mineralization tank / device, the slurry stirring mechanism is connected to the primary mineralization tank / device through a pipeline, the slurry stirring mechanism includes a slurry bin body, the left side of the slurry bin body is fixedly connected to the raw material inlet, the right side of the slurry bin body is fixedly connected to the raw material outlet, and a slurry bin agitator is arranged inside the slurry bin body.

[0011] Preferably, the primary mineralization pool / device includes a mineralization bin, a slurry inlet is fixedly connected to the left side of the mineralization bin, the raw material outlet pipe is connected to the slurry inlet, a slurry outlet is fixedly connected to the lower right side of the mineralization bin, and the mineralized concrete is transported to the concrete prefabricated component production line through the slurry outlet, the upper right side of the mineralization bin is fixedly connected to the mineralization bin water replenishment port, a mineralization bin CO2 raw gas inlet is opened at the bottom of the mineralization bin, the mineralization bin CO2 raw gas inlet is arranged in multiple groups and evenly distributed at the bottom of the mineralization bin, the CO2 raw gas inlet of the mineralization bin has an air inlet diameter of not less than 100 mm, a mineralization recovery gas outlet is opened above the mineralization bin, the mineralization recovery gas outlet is arranged in multiple groups and evenly distributed on the top surface of the mineralization bin, a mineralization bin agitator is installed inside the mineralization bin, and a pH active calcium oxide tester is installed at the lower left side of the mineralization bin.

[0012] Preferably, the industrial flue gas CO2 secondary regulator includes a secondary regulator body, a recycled gas inlet is arranged at the lower end of the secondary regulator body, the secondary regulator body is connected by three cavities, the lower right side of the secondary regulator body is fixedly connected to the CO2 raw gas inlet, the upper left side of the secondary regulator body is fixedly connected to the CO2 outlet, the CO2 outlet pipeline is connected to the second air compressor, the upper right side of the secondary regulator body is fixedly connected to the secondary regulator circulating water inlet, the lower side of the secondary regulator body is fixedly connected to the secondary regulator circulating water outlet, a coil-type heat exchanger is installed inside the secondary regulator body, and the coil-type heat exchanger includes a process water pipeline 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, and the process water pipeline outlet is installed below the secondary regulator body, and a secondary regulator homogenizer is arranged inside the secondary regulator body, and a temperature and humidity transmitter is installed on one side above the secondary regulator body, and the water inlet of the secondary regulator circulating water inlet and the coil heat exchanger are controlled through the detection signal of the temperature and humidity transmitter to adjust the temperature and humidity inside the secondary regulator body, and a CO2 concentration sensor is also installed in the secondary regulator body, and the air intake of the CO2 raw gas inlet is controlled through the detection signal of the CO2 concentration sensor to adjust the CO2 concentration inside the secondary regulator body.

[0013] Preferably, the industrial flue gas CO2 curing kiln includes a kiln body, a plurality of kiln CO2 air inlet pipes are fixedly arranged at the lower part of the kiln body, the kiln CO2 air inlet pipe is evenly provided with a plurality of air outlet holes, the aperture of each air outlet hole is not less than mm, a kiln CO2 air outlet pipe is fixedly connected to the top of the kiln body, the kiln CO2 air outlet pipe is connected to the recovery gas inlet, the spacing between any two adjacent kiln CO2 air inlet pipes and the spacing between any two adjacent kiln CO2 air outlet pipes are both less than 100m, a water trough is arranged at the lower part of the inner cavity of the kiln body, a circulating sprayer is installed under the water trough, a heat exchanger is installed on the inner wall of the kiln body, a kiln temperature and humidity sensing device is installed on the right side above the kiln body, the temperature and humidity inside the kiln body are detected by the kiln temperature and humidity sensing device, and the circulating sprayer and the heat exchanger are linked to control the operation, thereby realizing the regulation of the temperature and humidity inside the kiln body, a liquid level monitoring instrument is arranged at the bottom of the kiln body, a condensate discharge port is arranged at the bottom of the kiln body, and a condensate discharge valve is arranged on the condensate discharge port.

[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 circulation pump, the circulation pump is connected to a water vapor circulation pipe, the outer layer of the water vapor circulation pipe is provided with an insulation layer and a heating belt, the other end of the water vapor circulation pipe is installed with an atomizing nozzle, and the atomizing nozzle is arranged above the inside of the kiln body.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] In view of the problems of poor utilization rate of industrial flue gas and low carbon fixation rate of building materials, the present invention develops a multi-stage mineralization and curing building material system for tail exhaust industrial flue gas based on the process of preparing non-burning building materials, and proposes to use CO2 in industrial flue gas for multiple and multi-stage mineralization and curing in the whole process of building material preparation, thereby improving the carbon fixation rate of conventional building materials and strengthening the mechanical strength of building materials. The implementation of the present invention can not only realize the low-carbon production of building materials, but also effectively reduce the carbon emission of industrial flue gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the multi-stage mineralization system for curing building materials using tail exhaust industrial flue gas according to 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 It is a schematic diagram of the primary mineralization pool / device of concrete slurry of the present invention.

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

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

[0022] In the figure: 1. Industrial flue gas CO2 primary regulator; 11. Primary regulator body; 12. Industrial flue gas inlet; 13. Buffer net; 14. Industrial flue gas outlet; 15. Homogenizer; 2. First air compressor; 3. Concrete slurry primary mineralization pool / device; 31. Slurry mixing mechanism; 311. Slurry bin body; 312. Raw material inlet; 313. Raw material outlet; 314. Slurry bin agitator; 32. Primary mineralization pool / device; 321. Mineralization bin; 322. Slurry inlet; 323. Slurry outlet; 324. Mineralization bin water inlet; 325. Mineralization bin CO2 raw material gas inlet; 326. Mineralization recovery gas outlet; 327. Mineralization bin agitator; 328. PH active calcium oxide tester; 4. Concrete prefabricated component production line; 5. Industrial flue gas CO2 secondary regulator; 51. Secondary regulator body; 52. Recovery gas inlet; 5 3. CO2 raw 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. Second air compressor; 7. Industrial flue gas CO2 curing kiln; 71. Kiln body ; 72. CO2 air inlet pipe of kiln body; 73. CO2 air outlet pipe of kiln body; 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 body temperature and humidity sensing device; A. Exhaust gas emission tower; B. Heating disk water circulation flow line; C. Make-up water flow line; D. Concrete processing flow line; F. Spray water circulation flow line. DETAILED DESCRIPTION

[0023] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0024] In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "front end", "rear end", "two ends", "one end", "the other end" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0025] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "provided with", "connected", etc. should be understood in a broad sense. For example, "connected" 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 it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] See also Figure 1-5 The present invention provides an embodiment: a multi-stage mineralization curing building material system using tail exhaust industrial flue gas, including an industrial flue gas CO2 primary regulator 1, an industrial flue gas inlet 12 of the industrial flue gas CO2 primary regulator 1 is connected to a tail gas emission tower through a pipeline, an 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 through a pipeline, and the outlet pipeline of the first air compressor 2 is connected to the CO2 raw gas inlet 325 of the mineralization bin of the concrete slurry primary mineralization pool / device 3, and a concrete pre-mineralization tank / device 3 is installed on one side. The prefabricated component production line 4 is used for molding and demoulding the mineralized concrete. The mineralized recovery gas outlet 326 on the concrete slurry primary mineralization pool / device 3 is piped 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 piped to the inlet of the second air compressor 6. The outlet pipe of the second air compressor 6 is connected to the kiln body CO2 inlet pipe 72 of the industrial flue gas CO2 curing kiln 7. The industrial flue gas CO2 curing kiln 7 is used for CO2 curing of the molds produced by the prefabricated concrete component production line 4.

[0028] Furthermore, the industrial flue gas CO2 first-stage regulator 1 includes a first-stage regulator body 11, which is connected by three cavities, the lower end of the first-stage regulator body 11 is fixedly connected to the industrial flue gas inlet 12, the industrial flue gas inlet 12 is piped to the exhaust gas emission tower, a buffer net 13 is installed inside the first-stage regulator body 11, and the upper end of the first-stage regulator body 11 is fixedly connected to the industrial flue gas outlet 14. A homogenizer 15 is arranged inside the first-stage regulator body 11, which can pre-treat the system flue gas and perform the flue gas homogenization process while filtering the system flue gas impurities.

[0029] Furthermore, the concrete slurry primary mineralization tank / device 3 includes a slurry stirring mechanism 31 and a primary mineralization tank / device 32. The slurry stirring mechanism 31 is connected to the primary mineralization tank / device 32 through a pipeline. The slurry stirring mechanism 31 includes a slurry bin main body 311. The left side of the slurry bin main body 311 is fixedly connected to a raw material inlet 312, and the right side of the slurry bin main body 311 is fixedly connected to a raw material outlet 313. A slurry bin agitator 314 is arranged inside the slurry bin main body 311, which can pre-process the concrete slurry.

[0030] Furthermore, the primary mineralization pool / device 32 includes a mineralization bin 321, a slurry inlet 322 is fixedly connected to the left side of the mineralization bin 321, a raw material outlet 313 is connected to the slurry inlet 322 by a pipeline, a slurry outlet 323 is fixedly connected to the lower right side of the mineralization bin 321, and the mineralized concrete is transported to the concrete prefabricated component production line 4 through the slurry outlet 323, a mineralization bin water replenishment port 324 is fixedly connected to the upper right side of the mineralization bin 321, and a mineralization bin CO2 raw material gas inlet 325 is opened at the bottom of the mineralization bin 321, and the CO2 raw material gas inlet 325 of the mineralization bin is connected to the raw material gas inlet 326 of the mineralization bin. There are multiple groups of material gas inlets 325 evenly distributed at the bottom of the mineralization bin 321, the diameter of the CO2 raw gas inlet 325 of the mineralization bin is not less than 100 mm, a mineralization recovery gas outlet 326 is opened above the mineralization bin 321, and there are multiple groups of mineralization recovery gas outlets 326 evenly distributed on the top surface of the mineralization bin 321, a mineralization bin agitator 327 is installed inside the mineralization bin 321, and a PH active calcium oxide tester 328 is installed at the lower left side of the mineralization bin 321, so that the concrete slurry and the flue gas undergo an initial mineralization reaction.

[0031] Furthermore, the industrial flue gas CO2 secondary regulator 5 includes a secondary regulator body 51, a recycled gas inlet 52 is provided at the lower end of the secondary regulator body 51, the secondary regulator body 51 is connected by three cavities, the lower right side of the secondary regulator body 51 is fixedly connected to the CO2 raw gas inlet 53, the upper left side of the secondary regulator body 51 is fixedly connected to the CO2 outlet 54, the CO2 outlet 54 is connected to the second air compressor 6 by a pipeline, the upper right side of the secondary regulator body 51 is fixedly connected to the secondary regulator circulating water inlet 55, the lower side of the secondary regulator body 51 is fixedly connected to the secondary regulator circulating water outlet 56, a coil-type heat exchanger 57 is installed inside the secondary regulator body 51, the coil-type 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. A secondary regulator homogenizer 58 is arranged inside the secondary regulator body 51. 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 intake of the secondary regulator circulating water inlet 55 and the coil heat exchanger 57 to adjust 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 intake of the CO2 raw gas inlet 53 to adjust the CO2 concentration inside the secondary regulator body 51, so as to supplement the flue gas, increase the recycling of the flue gas, reduce the external discharge, and realize the control of the flue gas temperature.

[0032] Furthermore, the industrial flue gas CO2 curing kiln 7 comprises a kiln body 71, a plurality of kiln body CO2 air inlet pipes 72 are fixedly arranged at the lower part of the kiln body 71, a plurality of air outlet holes are evenly opened on the kiln body CO2 air inlet pipe 72, and the aperture of each air outlet hole is not less than 8 mm, a kiln body CO2 air outlet pipe 73 is fixedly connected to the top of the kiln body 71, and the kiln body CO2 air outlet pipe 73 is connected to the recovery gas inlet 52, and the spacing between any two adjacent kiln body CO2 air inlet pipes 72 and the spacing between any two adjacent kiln body CO2 air outlet pipes 73 are less than 10m, and a water tank 74 is arranged at the lower part of the inner cavity of the kiln body 71, and a circulating gas recirculation device is installed below the water tank 74. The kiln body 71 is provided with a heat exchanger 76 installed on the inner wall thereof, and a kiln body temperature and humidity sensing device 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 sensing device 77, and the circulating sprayer 75 and the heat exchanger 76 are controlled to work in conjunction, so as to adjust the temperature and humidity inside the kiln body 71. A liquid level monitoring instrument is arranged at the bottom of the kiln body 71, and a condensate discharge port is arranged at the bottom of the kiln body 71. A condensate discharge valve is arranged on the condensate discharge port, which can effectively control the temperature and humidity of the kiln body 71, better promote the maintenance of concrete building materials, and recycle and reuse the flue gas, which is 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 outer layer of the water vapor circulation pipe 753 is provided with an insulation layer and a heating belt, the other end of the water vapor circulation pipe 753 is installed with an atomizing nozzle 754, the atomizing nozzle 754 is arranged above the inside of the kiln body 71, thereby realizing the circulation of spraying water, which is more environmentally friendly.

[0034] A method for using a multi-stage mineralization curing building material system using tail exhaust industrial flue gas, comprising 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 tail exhaust gas first passes through the industrial flue gas CO2 primary regulator 1, and then is introduced into the concrete slurry primary mineralization pool / device 3 through the flue by the first air compressor 2, and the concrete slurry in the concrete slurry primary mineralization pool / device 3 is primary mineralized to effectively increase the calcium carbonate crystal nuclei in the concrete slurry. The concrete slurry after primary mineralization is injected into the mold for building material forming, and the excess flue gas in the primary mineralization pool 32 enters the industrial flue gas CO2 secondary regulator 5 from the flue; after the CO2 concentration, temperature and humidity of the flue gas are adjusted by the industrial flue gas CO2 secondary regulator 5, the second air compressor 6 is used to pressurize the flue gas and enter the kiln from the bottom of the industrial flue gas CO2 curing kiln 7, and a circulating sprayer 75 is provided at the top of the kiln, and a circulating water tank 74 is provided at the bottom of the kiln, which can be used for spraying and replenishing water in the curing kiln and for humidity regulation of the industrial flue gas CO2 secondary regulator 5; the excess water in the circulating water tank 74 is pumped into the water vapor circulation pipe 753 by a circulating pump 752 for reuse.

[0036] Working principle: Based on the production process of solid waste-based building materials prepared with industrial solid waste (including but not limited to fly ash, steel slag, carbide slag, etc.), general silica cement, foaming agent and water as raw materials, the tail exhaust industrial flue gas is introduced into the pulping process, and the CO2 in the flue gas reacts with part of the calcium ions in the solid waste slurry to undergo mineralization reaction. The size and crystal shape of the generated calcium carbonate crystals are controlled by process parameters to obtain an appropriate amount of calcium carbonate seeds. The 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 the process. Subsequently, a foaming agent is added to the slurry, stirred evenly and injection molded, and then transferred to the concrete slurry primary mineralization pool / device 3 for primary curing. After the module is formed, it is demolded and cut into test blocks. At this time, the calcium carbonate seeds are evenly distributed in the test blocks; finally, the test blocks are stacked and transferred to the industrial flue gas CO2 curing kiln 7, and industrial flue gas is introduced for mineralization curing. At this time, the gelation reaction continues. At the same time, the CO2 in the environment dissolves in the water to produce carbonate ions, and the carbonate ions react with the calcium ions in the pores of the test blocks to undergo acid hydrolysis and neutralization to form calcium carbonate precipitates. Since the calcium carbonate generated by the primary mineralization process inside the test block serves as a seed, 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 edge, filling the pore channels of the test block, and improving the carbon fixation rate and strength of solid waste-based building materials. Thus, the problem of partial blocking of the surface layer of the test block pores in the conventional mineralization curing process without the primary mineralization process is improved. In addition, the calcium carbonate generated under the CO2 concentration in the curing room is difficult to react with calcium bicarbonate and be destroyed under the low concentration CO2 condition in the air. Therefore, the present invention provides a supporting process flow and system for the multi-stage mineralization curing building material technology using tail exhaust industrial flue gas, and provides equipment support for achieving a good improvement and strengthening effect on the carbon fixation efficiency and strength of solid waste-based building materials.

[0037] The above is only an embodiment of the present invention, and the common sense such as the known specific structure and characteristics in the scheme is not described in detail here. For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive, and the scope of the present invention is defined by the attached claims rather than the above description, so it is intended to include all changes within the meaning and scope of the equivalent elements of the claims. Any figure mark in the claims should not be regarded as limiting the claims involved.

Claims

1. A system for curing building materials by multi-stage mineralization of tail exhaust industrial flue gas, characterized in that: The invention comprises 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 an exhaust gas emission tower through 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) through a pipeline, the outlet pipeline of the first air compressor (2) is connected to the CO2 raw gas inlet (325) of a mineralization bin of a concrete slurry primary mineralization tank / device (3), and a concrete prefabricated component production line (4) is installed on one side of the concrete slurry primary mineralization tank / device (3) for preparing the mineralized concrete. The concrete slurry is formed and demoulded, the mineralized recovery gas outlet (326) on the primary mineralization pool / device (3) 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), and the outlet pipe of the second air compressor (6) is connected to the kiln body CO2 inlet pipe (72) of the industrial flue gas CO2 curing kiln (7), and the industrial flue gas CO2 curing kiln (7) is used to perform CO2 curing on the molds produced by the concrete precast component production line (4).

2. A system for curing building materials by multi-stage mineralization using tail exhaust industrial flue gas according to claim 1, characterized in that: The industrial flue gas CO2 primary regulator (1) comprises a primary regulator body (11), the primary regulator body (11) is connected by three cavities, the lower end of the primary regulator body (11) is fixedly connected to an industrial flue gas inlet (12), the industrial flue gas inlet (12) is connected to an exhaust gas emission tower through a pipeline, a buffer net (13) is installed inside the primary regulator body (11), the upper end of the primary regulator body (11) is fixedly connected to an industrial flue gas outlet (14), and a homogenizer (15) is arranged inside the primary regulator body (11).

3. The multi-stage mineralization and curing building material system using tail exhaust industrial flue gas according to claim 1 is characterized in that: The concrete slurry primary mineralization tank / device (3) comprises a slurry stirring mechanism (31) and a primary mineralization tank / device (32), wherein the slurry stirring mechanism (31) is connected to the primary mineralization tank / device (32) via a pipeline, and the slurry stirring mechanism (31) comprises a slurry bin body (311), wherein the left side of the slurry bin body (311) is fixedly connected to a raw material inlet (312), and the right side of the slurry bin body (311) is fixedly connected to a raw material outlet (313), and a slurry bin stirrer (314) is arranged inside the slurry bin body (311).

4. A system for curing building materials by multi-stage mineralization using tail exhaust industrial flue gas according to claim 3, characterized in that: The primary mineralization pool / device (32) comprises a mineralization bin (321), a slurry inlet (322) is fixedly connected to the left side of the mineralization bin (321), the raw material outlet (313) is connected to the slurry inlet (322) through a pipeline, a slurry outlet (323) is fixedly connected to the lower right side of the mineralization bin (321), and mineralized concrete is transported to the precast concrete component production line (4) through the slurry outlet (323), a mineralization bin water replenishment port (324) is fixedly connected to the upper right side of the mineralization bin (321), and a mineralization bin CO2 raw material gas inlet (324) is provided at the bottom of the mineralization bin (321). 5), the mineralization bin CO2 raw gas inlet (325) is provided with multiple groups and is evenly distributed at the bottom of the mineralization bin (321), the gas inlet diameter of the mineralization bin CO2 raw gas inlet (325) is not less than 100 mm, a mineralization recovery gas outlet (326) is opened above the mineralization bin (321), and the mineralization recovery gas outlet (326) is provided with multiple groups and is evenly distributed on the top surface of the mineralization bin (321), a mineralization bin agitator (327) is installed inside the mineralization bin (321), and a pH active calcium oxide tester (328) is installed at the lower left side of the mineralization bin (321).

5. A system for curing building materials by multi-stage mineralization using tail exhaust industrial flue gas according to claim 4, characterized in that: The industrial flue gas CO2 secondary regulator (5) comprises a secondary regulator body (51), a recycled gas inlet (52) is arranged at the lower end of the secondary regulator body (51), the secondary regulator body (51) is connected by three cavities, the lower right side of the secondary regulator body (51) is fixedly connected to the CO2 raw gas inlet (53), the upper left side of the secondary regulator body (51) is fixedly connected to the CO2 outlet (54), the CO2 outlet (54) is connected to the second air compressor (6) through a pipeline, the upper right side of the secondary regulator body (51) is fixedly connected to the secondary regulator circulating water inlet (55), the lower side of the secondary regulator body (51) is fixedly connected to the secondary regulator circulating water outlet (56), a coil heat exchanger (57) is installed inside the secondary regulator body (51), and the coil heat exchanger (57) comprises a process water pipeline inlet (571) 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). A secondary regulator homogenizer (58) is arranged inside the secondary regulator body (51). A temperature and humidity transmitter (59) is installed on one side above the secondary regulator body (51). The water intake of the secondary regulator circulating water inlet (55) and the coil heat exchanger (57) are controlled by the detection signal of the temperature and humidity transmitter (59) to adjust the temperature and humidity inside the secondary regulator body (51). A CO2 concentration sensor is also installed on the secondary regulator body (51). The air intake of the CO2 raw gas inlet (53) is controlled by the detection signal of the CO2 concentration sensor to adjust the CO2 concentration inside the secondary regulator body (51).

6. The multi-stage mineralization and curing building material system using tail exhaust industrial flue gas according to claim 1 is characterized in that: The industrial flue gas CO2 curing kiln (7) comprises a kiln body (71), a plurality of kiln body CO2 air inlet pipes (72) are fixedly arranged at the lower part of the kiln body (71), the kiln body CO2 air inlet pipe (72) is evenly provided with a plurality of air outlet holes, and the aperture of each air outlet hole is not less than 8 mm, a kiln body CO2 air outlet pipe (73) is fixedly connected to the top of the kiln body (71), and the kiln body CO2 air outlet pipe (73) is connected to the recovery gas inlet (52), the spacing between any two adjacent kiln body CO2 air inlet pipes (72) and the spacing between any two adjacent kiln body CO2 air outlet pipes (73) are both less than 10 m, and the inner cavity of the kiln body (71) A water tank (74) is provided at the lower part, 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), and a kiln body temperature and humidity sensing device (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 sensing device (77), and the circulating sprayer (75) and the heat exchanger (76) are controlled to work in a linkage manner, thereby achieving the adjustment 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 discharge port is provided at the bottom of the kiln body (71), and a condensate discharge valve is provided on the condensate discharge port.

7. A system for curing building materials by multi-stage mineralization using tail exhaust industrial flue gas according to claim 6, characterized in that: The circulating sprayer (75) comprises 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 preservation layer and a heating belt; the other end of the water vapor circulation pipe (753) is provided with an atomizing nozzle (754); the atomizing nozzle (754) is arranged above the inside of the kiln body (71).

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