Pre-curing and mineralization reaction system for industrial solid waste mineralization CO2 and control method

Abstract

The invention relates to the technical field of solid waste recycling, and particularly discloses a pre-curing and mineralization reaction system for industrial solid waste mineralization CO2 and a control method. Comprising a reaction kettle which is provided with a closed cavity and is used for pre-curing and mineralizing a formed material blank, a flow guide assembly which is arranged in the reaction kettle and is used for guiding flow of flue gas, and a water replenishing assembly which is arranged on the reaction kettle and is used for pre-curing the formed material blank and replenishing water, cooling, atomizing and replenishing water; the reaction kettle is provided with an air inlet unit, an air outlet and a drain outlet; flue gas enters the reaction kettle through the gas inlet unit to react with a formed blank, and then is discharged through the gas outlet; and condensate water formed in the reaction process is discharged from the drain outlet. According to the invention, a pre-curing area and a mineralization reaction area are combined into one, so that compared with the prior art, the occupied area is reduced, the structure is simple, and the practicability is high. The distribution uniformity of flue gas in the reaction kettle can be improved, the contact reaction probability is increased, and the mineralization reaction efficiency and the product quality are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of solid waste resource utilization, and more particularly to a pre-curing and mineralization reaction system for industrial solid waste mineralized CO2. Background Art

[0002] Carbon dioxide capture, utilization, and storage technologies are considered key to mitigating climate change and protecting the human environment. Among these technologies, CO2 mineralization utilizes alkaline metals from industrial solid waste and natural minerals to react with CO2 to form stable carbonates, thereby fixing the CO2. This technology offers advantages such as low cost, large-scale production, and long-term stability, and holds broad application prospects.

[0003] Currently, the technology for mineralizing industrial solid waste with CO2 curing building materials is being actively promoted. However, during the scale-up and application of industrial solid waste, the following problems still exist: 1) The direct carbonation reaction has a slow reaction rate at room temperature and pressure, and usually requires high temperature and high pressure conditions, which requires high energy consumption; 2) The gas source is mainly high-concentration or captured and purified CO2, which reduces the economic efficiency of the technology; 3) Mass transfer is a key factor affecting mineralization and storage, and the intensification of the mass transfer process is mostly studied in process development, while research on mineralization reactor equipment is relatively rare; 4) The mineralization reactor generally adopts a traditional horizontal curing reactor, with pre-curing and mineralization reaction zones set up separately, occupying a large area; 5) The mineralization reaction is highly exothermic, and the temperature inside the mineralization reactor and the moisture content of the mineralized raw materials are uncontrollable, reducing the mineralization efficiency.

[0004] A Chinese invention with patent publication number CN113561303B discloses a device and method for CO2 mineralization curing of concrete blocks. The method increases the reaction probability and efficiency between blocks and gas by strengthening flue gas flow and disturbance and continuously introducing flue gas, thereby enhancing the reaction mass transfer process. However, the pre-curing and mineralization curing processes are separated, and the device occupies a large area.

[0005] A Chinese invention with patent publication number CN116766370A discloses a carbonization reactor specifically for aerated concrete. The reactor can precisely control the temperature, humidity, and CO2 concentration inside the reactor to ensure the smooth progress of the mineralization reaction. However, it is unable to add water to the reaction system. The pressurized mineralization reaction is carried out using 90% to 100% CO2. When the concentration is lower than 30%, some gas is discharged and then re-injected with high-concentration gas, resulting in a complicated operation process. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to provide a pre-curing and mineralization reaction system and control method for industrial solid waste mineralized CO2;

[0007] The solution adopted by the present invention to solve the technical problem is:

[0008] A pre-curing and mineralization reaction system for the mineralization of industrial solid waste into CO2, comprising a reactor with a closed chamber for pre-curing and mineralizing molded blanks, a diversion component arranged in the reactor for diverting flue gas, and a water-replenishing component installed on the reactor for pre-curing, replenishing water, cooling, and atomizing water replenishment; the reactor is provided with an air inlet unit, an air outlet, and a sewage outlet; the flue gas enters the reactor through the air inlet unit to react with the molded blank, and is then discharged through the air outlet; condensed water formed during the reaction is discharged from the sewage outlet.

[0009] In some possible embodiments, the air inlet units are in two groups and are symmetrically arranged along the axial direction of the reactor, and each group of air inlet units includes multiple groups of flue gas inlets arranged in sequence along the axial direction of the reactor; the air outlets are in two groups and are symmetrically arranged along the axial direction of the reactor.

[0010] In some possible implementations, the flow guide assembly includes multiple groups of flow guide members disposed in the reactor and arranged circumferentially around the reactor, and cavities for placing the molding blanks are formed between the multiple groups of flow guide members.

[0011] In some possible implementations, each group of the guide members includes multiple groups of guide plates sequentially arranged along the axial direction of the reactor; and the guide plates are arranged at an angle.

[0012] In some possible implementations, a flow regulating component is provided on each group of the flue gas inlet and outlet, respectively; and a pressure monitoring component is provided on each group of the flue gas inlet, outlet and reactor, respectively.

[0013] In some possible implementations, a humidity monitoring component and a temperature monitoring component are further provided on the reactor.

[0014] In some possible implementations, a gas collecting pipe for discharging smoke from the reactor or transporting smoke into the reactor is further provided in the reactor and below the molding blank; and a plurality of groups of through holes are provided on the gas collecting pipe.

[0015] In some possible implementations, the axial direction of the gas collecting pipe is arranged along the axial direction of the reactor, and one side of the gas collecting pipe passes through the reactor and is located outside the reactor and connected to the gas outlet.

[0016] In some possible embodiments, the atomization water replenishment assembly includes a water pipe installed in the reactor and located above the molding preform, an atomizer located above the molding preform and connected to the water pipe, and a process water system connected to the water pipe and located outside the reactor.

[0017] A control method for a pre-curing and mineralization reaction system for industrial solid waste mineralized CO2 according to the above-mentioned method specifically comprises the following steps:

[0018] Step S1: Open the lid of the reactor, place the preform into the reactor, close the lid, and seal it;

[0019] Step S2: adding water to the reactor through the atomizing water supply component so that the humidity in the reactor is 70-90% RH during pre-curing, and the pre-curing time is 1-3 days;

[0020] Step S3: closing the atomizing water supply component and delivering flue gas with a CO2 concentration of 10-30% and a temperature of 60-80°C into the reactor to perform a mineralization reaction on the molding blank; wherein the temperature in the reactor is 40-80°C, the pressure is 0.02-1.5MPa, the reaction time is 2-10h, and the formed condensed water is discharged;

[0021] When the temperature inside the reactor is monitored to be greater than 80°C, water is added to the reactor through the atomizing water supply component to cool it down;

[0022] When the pressure inside the reactor is less than 0.02MPa, the reactor is pressurized by increasing the flue gas inlet flow rate or reducing the flue gas outlet flow rate;

[0023] When the pressure inside the reactor is greater than 1.5 MPa, the pressure is released through the safety valve installed on the reactor.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] The present invention provides a closed reaction site and a moistening liquid phase environment for the reaction between CO2 gas and solid-phase active components for pre-curing and mineralization reactions by setting an atomizing water replenishment component, while effectively ensuring that the temperature in the reactor meets the requirements;

[0026] The present invention effectively enhances the disturbance of the flue gas entering the reactor by arranging the guide component, strengthens the mass transfer effect of the reaction process, and improves the mineralization efficiency;

[0027] The present invention also provides multiple groups of air inlet units and gas collecting pipes, which can realize the replenishment of fresh flue gas at different positions of the molding bed in the middle stage of the mineralization reaction, improve the uniformity of flue gas distribution in the reactor, increase the probability of contact reaction between flue gas and the central area of the molding, and improve the efficiency of the mineralization reaction and product quality.

[0028] The present invention provides a temperature monitoring component, a flow regulating component, a humidity monitoring component and a pressure monitoring component to monitor the reaction process inside the reactor in real time and make adjustments, thereby ensuring that the mineralization reaction is controllable and continuous, thereby improving production efficiency.

[0029] Compared with the prior art, the present invention combines the pre-curing area and the mineralization reaction area into one, which saves land area, has a simple structure and is highly practical. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 Schematic diagram of the internal structure of the present invention;

[0031] Figure 2 is a cross-sectional view of the present invention;

[0032] Among them: 1. Reactor; 11. Flue gas inlet; 12. Gas outlet; 13. Sewage outlet; 14. Guide plate; 15. Water pipe; 16. Gas collecting pipe; 2. Flow regulating component; 3. Pressure monitoring component; 4. Humidity monitoring component; 5. Temperature monitoring component; 10. Reactor cover; 100. Molding blank. DETAILED DESCRIPTION

[0033] In this application, unless otherwise specified or limited, terms such as "mounted," "connected," "connect," and "fixed" should be interpreted broadly. For example, they can refer to fixed connections, removable connections, or integration; they can refer to direct connections or indirect connections through an intermediary; they can refer to internal communication between two components or interactions between two components. The terms "first," "second," and similar terms mentioned in this application do not denote any order, quantity, or importance; they are simply used to distinguish between different components. Similarly, terms such as "a" or "an" do not indicate a quantitative limitation, but rather indicate the presence of at least one. In the implementation of this application, "and / or" describes an association relationship between associated objects, indicating that three possible relationships exist. For example, "A and / or B" can mean: A exists alone, A and B exist simultaneously, or B exists alone. In the description of the embodiments of this application, unless otherwise specified, "plurality" means two or more. For example, "plurality" refers to two or more positioning posts. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances.

[0034] The present invention is described in detail below.

[0035] like Figure 1-Figure 2 As shown:

[0036] A pre-curing and mineralization reaction system for industrial solid waste mineralization CO2 includes a reactor 1 having a sealed chamber and used for pre-curing and mineralizing a molded blank 100, a flow guide assembly disposed within the reactor 1 and used to guide flue gas, and a water supply assembly mounted on the reactor 1 and used for pre-curing, cooling, and atomizing the molded blank 100; the reactor 1 is provided with an air inlet unit, an air outlet 12, and a sewage outlet 13;

[0037] When in use, the reactor 1 is placed horizontally with its axis horizontal; a chamber is provided in the reactor 1, one end of the reactor 1 has an opening connected to the chamber, and a reactor cover 10 is provided on the opening. The reactor cover 10 is sealed with the reactor 1, so that the chamber becomes a sealed chamber;

[0038] The molding blank 100 is placed in a sealed chamber and pre-cured by atomizing and replenishing water through the atomizing and replenishing water component. After the pre-curing is completed, the flue gas enters the reactor 1 through the air inlet unit to react with the molding blank 100 for mineralization, and the reacted gas is discharged through the air outlet 12. The condensed water formed during the reaction is discharged from the drain outlet 13.

[0039] The present invention effectively realizes pre-curing and mineralization reaction in the reactor 1, greatly reducing the floor space occupied;

[0040] During the mineralization reaction, the pressure inside the reactor 1 is effectively regulated by adjusting the flue gas inlet volume of the air inlet unit or the flue gas outlet volume of the air outlet 12;

[0041] Furthermore, three sewage outlets 13 are provided at the bottom of the reactor 1. The three sewage outlets 13 are provided at the head end of the reactor 1 close to the reactor cover 10, the middle section of the reactor 1 and the tail end of the reactor 1;

[0042] Furthermore, due to the presence of acidic gases and chloride ion corrosion in the flue gas, the reactor 1 will be made of corrosion-resistant materials; the pressure resistance of the reactor 1 is 0-1.5 MPa, and the wall thickness is 6-12 mm; when the external environment is low, the heat loss of the reactor 1 is obvious, and a thermal insulation layer can be added to the outside of the reactor to achieve thermal insulation; specifically, the thermal insulation layer includes an aluminum sheet sheathed on the outside of the reactor 1, and thermal insulation cotton arranged between the aluminum sheet and the reactor 1.

[0043] In some possible embodiments, the air inlet units are provided in two groups and are symmetrically arranged along the axial direction of the reactor 1, and each group of air inlet units includes multiple groups of flue gas inlets 11 arranged in sequence along the axial direction of the reactor 1; the air outlets 12 are provided in two groups and are symmetrically arranged along the axial direction of the reactor 1;

[0044] By providing multiple groups of air inlet units, the flue gas can enter the reactor 1 through different flue gas inlets 11 according to the required proportion; at the same time, in the middle stage of the mineralization reaction, fresh flue gas CO2 gas can be replenished in time at different positions of the molding blank 100 bed layer, thereby improving the uniformity of gas distribution in the reactor 1, increasing the contact reaction probability of the gas with the mineralized raw materials in the central area, and improving the efficiency of the mineralization reaction and the product quality;

[0045] It should be noted that the number of the flue gas inlets 11 in each group of air inlet units can be set according to the size of the reactor 1;

[0046] Furthermore, the distance between two adjacent groups of air inlet units is not greater than 3m; the number of smoke inlets 11 in each group of air inlet units is 3-6 groups; when the number of smoke inlets 11 in each group of air inlet units is 4 groups, the flow rate of each smoke inlet 11 is 10% to 60%.

[0047] In some possible embodiments, in order to effectively allow the flue gas entering the reactor 1 to contact the molding blank 100, increase the reaction probability, and avoid the flue gas from being directly discharged from the air outlet 12 after entering the reactor 1; the guide assembly includes multiple groups of guide members arranged in the reactor 1 and arranged circumferentially around the reactor 1, and cavities for placing the molding blank 100 are formed between the multiple groups of guide members; each group of the guide members includes multiple groups of guide plates 14 arranged in sequence at equal intervals along the axial direction of the reactor 1; the guide plates 14 are arranged at an angle and are hinged to the reactor 1, thereby effectively realizing the adjustment of the inclination angle of the guide plates 14.

[0048] Preferably, there are four groups of flow guides, which are evenly arranged around the circumference of the reactor 1. Specifically, Figure 2 As shown, the four groups of guide pieces are arranged up, down, left and right;

[0049] A track for supporting the molded preform 100 is installed in the cavity; the guide plate 14 at the bottom of the reactor 1 will be located below the track;

[0050] Specifically, the gap between the guide plate 14 and the molding blank 100 is H, H = 20-80 mm; after the flue gas enters the reactor 1 through the flue gas inlet 11, it enters the gap under the action of the guide plate 14 and moves along the gap toward the gas outlet 12, so that the flue gas can fully react with the molding blank 100.

[0051] Furthermore, the cross section of the reactor 1 is annular, and the angle formed between the guide plate 14 and the axial direction of the reactor 1 is A, where A=15°-90°.

[0052] In some possible embodiments, in order to effectively adjust the flow of smoke through the smoke inlet 11 and the gas outlet 12 so that the smoke can be fed into different smoke inlets 11 in proportion, a flow regulating assembly 2 is provided on each group of the smoke inlet 11 and the gas outlet 12. The flow regulating assembly 2 includes a flow meter and a regulating valve.

[0053] In order to effectively monitor the pressure of the flue gas passing through the flue gas inlet 11 and the gas outlet 12, a pressure monitoring component 3 is provided on each group of the flue gas inlet 11, the gas outlet 12 and the reactor 1, thereby effectively ensuring that the pressure inside the reactor 1 is maintained at 0.02-1.5 MPa, so that the flue gas can pass through the molding preform 100 bed layer to participate in the reaction;

[0054] In order to effectively monitor the humidity and temperature in the reactor 1, a humidity monitoring component 4 and a temperature monitoring component 5 are provided on the reactor 1, thereby effectively ensuring that the temperature in the reactor 1 is 40-80°C and the humidity is 70-90% RH during pre-curing.

[0055] Specifically, the temperature monitoring components 5 are multiple groups and are evenly arranged along the axial direction of the reactor 1 to monitor the temperature at different positions inside the reactor 1 in real time, making the temperature monitoring more accurate; the humidity monitoring component 4 is arranged at the center of the top of the reactor 1 to monitor the humidity changes inside the reactor 1 in real time;

[0056] In some possible embodiments, a gas collecting pipe 16 for discharging smoke from the cavity or transporting smoke into the cavity is further provided in the reactor 1 and below the molding blank 100; the gas collecting pipe 16 is provided with a plurality of groups of through holes;

[0057] The gas collecting pipe 16 is installed in the reactor 1 and is located below the molding blank 100. During the mineralization reaction, the flue gas inside the reactor 1 can be discharged to the outside or transported into the reactor 1.

[0058] Furthermore, the axial direction of the gas collecting pipe 16 is arranged along the axial direction of the reactor 1, and one side of the gas collecting pipe 16 passes through the reactor 1 and is located outside the reactor 1 and connected to the gas outlet 12;

[0059] The gas outlet 12 is connected to the gas collecting pipe 16. By adding a booster fan in the pipeline between the two, the exhaust gas discharged from the gas outlet 12 can be effectively recycled and the CO2 utilization rate can be improved.

[0060] Furthermore, the axis of the gas collecting pipe 16 is coplanar with the axis of the reactor 1 , and the plane where they are located is vertically arranged to evenly divide the reactor 1 into two halves.

[0061] In some possible embodiments, in order to effectively achieve pre-curing of the molding preform 100 through the atomization water supply assembly, the atomization water supply assembly includes a water pipe 15 installed in the reactor 1 and located above the molding preform 100, an atomizer located above the molding preform 100 and connected to the water pipe 15, and a process water system connected to the water pipe 15 and located outside the reactor 1.

[0062] During pre-curing, the process water system supplies water to the water pipe 15 and transports the water to the atomizer. The atomizer performs atomization treatment to form atomized water to perform pre-curing operation on the molding blank 100. As the hydration reaction and mineralization reaction continuously release heat, the temperature inside the reactor 1 increases. When the temperature monitoring component 5 indicates that the temperature inside the reactor 1 is too high, the atomization water supply component will supply water to the reactor 1 to achieve cooling and at the same time replenish water into the reaction system to provide a liquid phase reaction environment.

[0063] Furthermore, the water pipes 15 are provided in two groups and are symmetrically arranged along the axial direction of the reactor 1. The atomizers on each group of water pipes 15 are provided in multiple groups and are arranged at equal intervals, ensuring that the formed blank 100 is within the atomization range and can effectively achieve pre-curing.

[0064] In order to ensure the atomization effect, the water pipe 15 is equipped with a filter membrane, and the atomizer selects a solid atomizing nozzle to ensure the atomization effect.

[0065] A control method for a pre-curing and mineralization reaction system for industrial solid waste mineralized CO2 according to the above-mentioned method specifically comprises the following steps:

[0066] Step S1: Open the lid 10 of the reactor 1, place the preform 100 into the reactor 1, adjust the gap between the guide plate 14 and the preform 100 and the inclination angle of the guide plate 14, close the lid 10, and seal the lid 10 and the reactor 1;

[0067] Step S2: Pre-curing the molding blank 100; during the pre-curing process, water is added to the interior of the reactor 1 through the atomizing water supply component, so that the humidity in the reactor 1 is 70-90% RH during the pre-curing, and the pre-curing time is 1-3 days; since the molding blank 100 loses water due to the heat released by the hydration reaction during the pre-curing, water is added to the interior of the reactor 1 through the atomizing water supply component to prevent the molding blank 100 from experiencing alkali reversion;

[0068] Step S3: mineralization reaction of the molding blank 100; close the atomizing water supply component, and deliver flue gas with a CO2 concentration of 10-30% and a temperature of 60-80°C into the reactor 1 through the flue gas inlet 11 to perform mineralization treatment on the molding blank 100; wherein, the temperature in the reactor 1 is controlled to be 40-80°C, the pressure is 0.02-1.5MPa, and the reaction time is 2-10h. During the reaction process, a large amount of heat is generated, and the moisture of the molding blank 100 is lost and condensed inside the reactor 1. The condensed water oil formed will be discharged through the drain port 13;

[0069] When the temperature monitoring component 5 detects that the temperature inside the reactor 1 is greater than 80°C, the atomizing water supply component is used to supply water to the reactor 1 to cool it down;

[0070] When the pressure monitoring component 3 detects that the pressure in the reactor 1 is less than 0.02 MPa, the reactor 1 is pressurized by increasing the flow rate of the flue gas at the flue gas inlet 11 or reducing the flow rate of the flue gas at the gas outlet 12;

[0071] When the pressure monitoring component 3 detects that the pressure in the reactor 1 is greater than 1.5 MPa, the pressure is released through the safety valve provided on the reactor 1 .

[0072] The present invention is not limited to the aforementioned specific embodiments, but extends to any new features or any new combination disclosed in this specification, as well as any new method or process steps or any new combination disclosed.

Claims

1. A pre-curing and mineralization reaction system for industrial solid waste mineralized CO2, characterized in that: It includes a reactor with a closed cavity and used for pre-curing and mineralization of molding blanks, a diversion component arranged in the reactor and used to divert flue gas, and a water-replenishing component installed on the reactor and used for pre-curing, water replenishment, cooling and atomization of the molding blanks; the reactor is provided with an air inlet unit, an air outlet and a sewage outlet; the flue gas enters the reactor through the air inlet unit to react with the molding blank, and is then discharged through the air outlet; the condensed water formed during the reaction is discharged from the sewage outlet.

2. The pre-curing and mineralization reaction system for industrial solid waste mineralized CO2 according to claim 1 is characterized in that: The air inlet units are in two groups and are symmetrically arranged along the axial direction of the reactor. Each group of air inlet units includes multiple groups of flue gas inlets arranged in sequence along the axial direction of the reactor; the air outlets are in two groups and are symmetrically arranged along the axial direction of the reactor.

3. The pre-curing and mineralization reaction system for industrial solid waste mineralized CO2 according to claim 1 is characterized in that: The flow guide assembly includes multiple groups of flow guide pieces arranged in the reactor and arranged circumferentially around the reactor, and cavities for placing molding blanks are formed between the multiple groups of flow guide pieces.

4. The pre-curing and mineralization reaction system for industrial solid waste mineralized CO2 according to claim 3 is characterized in that: Each group of the guide members includes a plurality of guide plates arranged in sequence along the axial direction of the reactor; the guide plates are arranged in an inclined manner.

5. The pre-curing and mineralization reaction system for industrial solid waste mineralized CO2 according to claim 2 is characterized in that: A flow regulating component is provided on each group of the flue gas inlet and outlet respectively; a pressure monitoring component is provided on each group of the flue gas inlet, outlet and reactor respectively.

6. The pre-curing and mineralization reaction system for industrial solid waste mineralized CO2 according to claim 1, characterized in that: The reactor is also provided with a humidity monitoring component and a temperature monitoring component.

7. The pre-curing and mineralization reaction system for industrial solid waste mineralized CO2 according to claim 1, characterized in that: A gas collecting pipe for discharging smoke from the cavity or transporting smoke into the cavity is also provided in the reactor and below the molding blank; a plurality of through holes are provided on the gas collecting pipe.

8. The pre-curing and mineralization reaction system for industrial solid waste mineralized CO2 according to claim 7, characterized in that: The axial direction of the gas collecting pipe is arranged along the axial direction of the reactor. One side of the gas collecting pipe passes through the reactor and is located outside the reactor and is connected to the gas outlet.

9. The pre-curing and mineralization reaction system for industrial solid waste mineralized CO2 according to claim 1, characterized in that: The atomizing water replenishing assembly includes a water pipe installed in the reactor and located above the molding blank, an atomizer located above the molding blank and connected to the water pipe, and a process water system connected to the water pipe and located outside the reactor.

10. A method for controlling a pre-curing and mineralization reaction system for industrial solid waste mineralized CO2 according to any one of claims 1 to 9, characterized in that: The specific steps include: Step S1: Open the lid of the reactor, place the preform into the reactor, close the lid, and seal it; Step S2: adding water to the reactor through the atomizing water supply component so that the humidity in the reactor is 70-90% RH during pre-curing, and the pre-curing time is 1-3 days; Step S3: closing the atomizing water supply component and delivering flue gas with a CO2 concentration of 10-30% and a temperature of 60-80°C into the reactor to mineralize the molding blank; wherein the temperature in the reactor is 40-80°C, the pressure is 0.02-1.5MPa, the reaction time is 2-10h, and the formed condensed water is discharged; When the temperature inside the reactor is monitored to be greater than 80°C, water is added to the reactor through the atomizing water supply component to cool it down; When the pressure inside the reactor is less than 0.02MPa, the reactor is pressurized by increasing the flue gas inlet flow rate or reducing the flue gas outlet flow rate; When the pressure inside the reactor is greater than 1.5 MPa, the pressure is released through the safety valve installed on the reactor.

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