Steel slag carbon sequestration device

Abstract

The utility model discloses a steel slag carbon sequestration device, and relates to the technical field of steel slag carbon sequestration. The steel slag carbon sequestration device comprises a stock bin, wherein the interior of the stock bin is used for storing and conveying steel slag powder; the liquid storage tank is used for storing and conveying a reaction catalyst; a liquid outlet of the liquid storage tank is connected with the atomizing chamber through an atomizing spray gun, the atomizing chamber is connected with a carbon dioxide emission pipeline of a factory through a pipeline, and the catalyst and the carbon dioxide flue gas are mixed; the stock bin is communicated with a feed port of the reactor through a feeding mechanism, and an outlet of the atomizing chamber is connected to the reactor; the discharging equipment is communicated with the discharging hole of the reactor; and the dust removal device is connected to the reactor. Chemical substances in the steel slag and a carbon dioxide emission pipeline in a factory are directly connected into the reactor through atomization for carbon sequestration reaction, reacted carbides are discharged, cement does not need to serve as a carrier, and the device can be suitable for different industries.

Description

Technical Field

[0001] This utility model relates to the field of steel slag carbonization technology, specifically to a device for steel slag carbonization. Background Technology

[0002] Steel slag is an industrial solid waste generated during the steelmaking process. Large stockpiles of steel slag not only occupy land and waste resources, but if discharged into water, they may also cause river siltation and soil alkalization. The harmful substances in the slag can also cause serious harm to humans and their living environment.

[0003] Steel slag carbonization technology involves placing steel slag in a CO2 gas environment and carbonizing it under specific temperature, humidity, and pressure conditions. The CO2 is fixed and stored as minerals. Therefore, steel slag carbonization technology not only solidifies a large amount of CO2 but also achieves effective utilization of secondary resources. Building materials such as bricks and tiles produced in this way have advantages such as high strength, low price, and good stability. During the carbonization process, the formation of new phases binds the substances within the system together, thus enabling the production of high-performance steel slag carbonized products.

[0004] Existing steel slag carbonization processes mainly utilize steel slag to capture CO2 from cement kiln flue gas to prepare carbon-fixing auxiliary cementitious materials and low-carbon cement. This process requires a cement kiln as a carrier, making it suitable for cement production enterprises, but its industrialization is limited. In existing steel slag carbonization technologies, the process of preparing carbon-fixing auxiliary cementitious materials and low-carbon cement from cement kiln flue gas CO2 requires a cement kiln, and the cement kiln exhaust gas is difficult to remove. Utility Model Content

[0005] Therefore, this utility model provides a device for carbon fixation of steel slag to solve the problems existing in the above-mentioned technology.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] A device for carbon sequestration in steel slag, comprising:

[0008] A silo for storing and conveying steel slag powder;

[0009] A liquid storage tank for storing and transporting the catalyst for the reaction;

[0010] The liquid outlet of the liquid storage tank is connected to the atomizing chamber via an atomizing spray gun, and the atomizing chamber is connected to the carbon dioxide emission pipe of the factory via a pipeline to mix the catalyst with the carbon dioxide flue gas.

[0011] The reactor has a hopper connected to the reactor inlet via a feeding mechanism, and the outlet of the atomizing chamber connected to the reactor.

[0012] A discharge device, wherein the discharge device is connected to the discharge port of the reactor;

[0013] A dust removal device, which is connected to the reactor.

[0014] Optionally, the reactor is provided with stirring blades, which are spirally distributed on the conveyor shaft of the reactor;

[0015] The conveyor shaft is connected to a variable frequency motor.

[0016] Optionally, the feeding mechanism includes a metering belt, which is located below the outlet of the hopper. A conveyor belt is provided at the end of the metering belt in the conveying direction, and the end of the conveyor belt in the conveying direction is connected to the inlet of the reactor.

[0017] Optionally, the outlet of the liquid storage tank is connected to an atomizing spray gun via a delivery pump, and the outlet of the atomizing spray gun is placed in the atomization chamber.

[0018] Optionally, the atomizing chamber is also connected to an air intake pipe, which is connected to the factory's carbon dioxide emission pipe, and a gas regulating valve is installed on the air intake pipe.

[0019] Optionally, a first valve and a second valve are connected in series at the outlet of the silo;

[0020] The first valve is a slide gate valve, and the second valve is a rotary valve.

[0021] Optionally, the dust removal device includes a dust collector, which is connected to the inside of the reactor and is used to remove unreacted flue gas and airborne materials in the reactor. The gas outlet of the dust collector is connected to a fan, and the material outlet of the dust collector is connected to a discharge device.

[0022] Optionally, the discharge device is a screw conveyor.

[0023] Optionally, the dust collector is a bag filter.

[0024] This utility model has at least the following beneficial effects:

[0025] This invention connects the chemical substances in steel slag directly to the reactor via an atomization system through a carbon dioxide emission pipe in the factory, enabling a carbon fixation reaction. The resulting carbon compounds are then discharged without the need for cement as a carrier, making it suitable for various industries. Attached Figure Description

[0026] To more clearly illustrate the prior art and the present invention, the accompanying drawings used in the description of the prior art and the embodiments of the present invention will be briefly introduced below. Obviously, the drawings described below are merely exemplary, and those skilled in the art can derive other drawings from the provided drawings without any creative effort.

[0027] The structures, proportions, sizes, etc. illustrated in this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed herein, and are not intended to limit the conditions under which this utility model can be implemented. Any modifications to the structure, changes in the proportions, or adjustments to the size, without affecting the effects and purposes that this utility model can produce, should still fall within the scope of the technical content disclosed in this utility model.

[0028] Figure 1 This is a schematic diagram of the principle structure of one embodiment of the present invention.

[0029] Explanation of reference numerals in the attached figures:

[0030] 101. Silo; 102. First valve; 103. Second valve; 104. Metering belt; 105. Conveyor belt; 106. Reactor; 107. Third valve; 108. Screw conveyor; 201. Liquid storage tank; 202. Transfer pump; 203. Atomizing spray gun; 204. Atomizing chamber; 205. Gas regulating valve; 206. Dust collector; 207. Fourth valve; 208. Fan. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0032] In the description of this utility model, unless otherwise stated, "a plurality of" means two or more. The terms "first," "second," "third," "fourth," etc. (if present), in the specification, claims, and accompanying drawings of this utility model are intended to distinguish the objects they refer to. For schemes with a sequential flow, this terminology need not be interpreted as describing a specific order or sequence; for schemes with device structures, this terminology does not distinguish between matters of importance or positional relationships.

[0033] Furthermore, the terms “comprising,” “having,” and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product, or device that includes a series of steps or units is not necessarily limited to those steps or units that are expressly listed, but may also include other steps or units that are not expressly listed but are inherent to these processes, methods, products, or devices, or steps or units added based on further optimizations of the inventive concept.

[0034] like Figure 1 The image shows a device for carbon fixation of steel slag disclosed in this utility model, comprising:

[0035] 101, wherein the 101 is used to store and transport steel slag powder;

[0036] Liquid storage tank 201, the liquid storage tank 201 being used to store and transport the catalyst for the reaction;

[0037] Atomization chamber 204, the outlet of the liquid storage tank 201 is connected to the atomization chamber 204 through the atomization spray gun 203, and the atomization chamber 204 is connected to the carbon dioxide emission pipe of the factory through the pipeline to mix the catalyst with the carbon dioxide flue gas.

[0038] The reactor 106 is connected to the feed inlet of the hopper 101 via a feeding mechanism, and the outlet of the atomizing chamber 204 is connected to the reactor 106.

[0039] A discharge device, which is connected to the discharge port of reactor 106;

[0040] A dust removal device is connected to the reactor 106.

[0041] The aforementioned silo 101 is used to store steel slag powder that has been crushed, de-ironized, and ground. Two valves connected in series are installed at the discharge port of the silo 101: a first valve 102 and a second valve 103. The first valve 102 is a slide gate valve that is normally open, and the second valve 103 is a rotary valve that is opened when feeding. If the second valve 103 fails, the feeding can be controlled by the first valve 102.

[0042] The liquid storage tank 201 is used to store the catalyst for the reaction, and its outlet is connected to a transfer pump 202 to transport the catalyst solution. The end of the transfer pipe is connected to an atomizing nozzle, which atomizes the catalyst solution and mixes it with the high-temperature flue gas of carbon dioxide emitted from the plant's carbon dioxide emission pipe in the atomization chamber 204, and then enters the reactor 106. The aqueous solution of the catalyst can accelerate the carbon fixation reaction of carbon dioxide.

[0043] The reactor 106 described above is easy to seal, providing a reaction site for the carbon fixation reaction.

[0044] The discharge equipment conveys the solid materials after carbonization; the dust removal equipment collects the reaction gas and floating materials in the reactor 106, filters them, discharges the harmless gas, and leaves the materials to be conveyed to the discharge equipment.

[0045] In a further embodiment, stirring blades are provided inside the reactor 106, and the stirring blades are spirally distributed on the conveying shaft of the reactor 106.

[0046] The conveyor shaft is connected to a variable frequency motor.

[0047] The reactor 106 is equipped with stirring blades, which can fully mix the steel slag with carbon dioxide flue gas and catalyst, thereby increasing the reaction rate. By setting a variable frequency motor connected to the conveyor shaft of the reactor 106, the travel time of the steel slag in the reactor 106 can be controlled and adjusted.

[0048] Furthermore, the feeding mechanism includes a metering belt 104, which is located below the discharge port of the hopper 101. A conveyor belt 105 is provided at the lower end of the metering belt 104 in the conveying direction, and the lower end of the conveyor belt 105 in the conveying direction is connected to the feed port of the reactor 106.

[0049] The atomizing chamber 204 is also connected to an air intake pipe, which is connected to the factory's carbon dioxide emission pipe, and a gas regulating valve 205 is installed on the air intake pipe.

[0050] It should be noted that, in addition to fixing carbon dioxide in the plant, the device of this application can also treat different exhaust gases from the plant by changing the materials and catalysts.

[0051] In a further embodiment, the dust removal device includes a dust collector 206, which is connected to the inside of the reactor 106 and is used to remove unreacted flue gas and flying materials inside the reactor 106. The gas outlet of the dust collector 206 is connected to a fan 208, and the material outlet of the dust collector 206 is connected to a discharge device.

[0052] The dust collector 206 mentioned above is a bag filter dust collector 206, which can filter the floating solid material (the carbonized object) and flue gas attracted by the reactor 106. The gas is drawn out to the atmosphere by the fan 208, while the filtered carbonized material is transported to the discharge equipment for material conveying. A fourth valve 207 is provided at the discharge port of the dust collector 206 connected to the discharge equipment. The fourth valve 207 is a slide gate valve.

[0053] The discharge device is a screw conveyor 108, and a third valve 107 is provided at the discharge port of the reactor 106. The third valve 107 is a slide gate valve.

[0054] In this application, crushed, iron-removed, and ground steel slag is first fed into reactor 106 via a metering and feeding device. A pump 202 then sprays catalyst from a solution storage tank into atomization chamber 204 via a spray gun for atomization. The atomized catalyst mixes with high-temperature CO2-containing flue gas and enters reactor 106 through a pipeline. The CO2-containing gas, steel slag, and gasified catalyst flow in a co-current direction within reactor 106, ensuring sufficient contact, and the catalyst promotes the reaction.

[0055] The Gibbs free energy of steel slag carbonization is negative, meaning it's a spontaneous process; given suitable environmental conditions, the reaction will occur automatically. This method and apparatus provide an excellent reaction environment. Inside reactor 106, the steel slag powder is agitated, dispersed, and lifted by the stirring blades. The stirring blades are spirally distributed on the conveyor shaft at an angle. This dispersion simultaneously propels the steel slag powder forward slowly. The conveyor shaft is connected to a variable frequency motor, thus the travel time of the steel slag within reactor 106 is controllable and adjustable. Reactor 106 operates under a slight negative pressure. CO2 participates in the reaction and is converted into solid CaCO3, 2SiO2, etc., without generating new gases. Other non-reacting gases are discharged without pollution after passing through a dust removal device under the action of the exhaust fan 208 at the end of the system. The gas flow rate and velocity are also controllable and adjustable. Stainless steel rods are placed between the stirring blades. During the rotation of the conveyor shaft, these rods continuously move up and down, vibrating the material adhering to the reactor wall and stirring blades, and crushing any agglomerated material. C2S and C3S in steel slag undergo hydration to form Ca(OH)2, which then reacts with CO2 to form CaCO3 particles. These granular CaCO3 particles fill internal voids, making the system more compact and improving the mechanical properties of the steel slag sample. This can enhance the strength and stability of steel slag products to some extent. However, the resulting CaCO3 shell partially encapsulates unreacted substances, hindering CO2 diffusion and further reaction processes.

[0056] The above specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments.

[0057] The technical features of the above embodiments can be combined in any way (as long as there is no contradiction in the combination of these technical features). For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described; these embodiments not explicitly written should also be considered to be within the scope of this specification.

[0058] The present invention has been described in detail above through general description and specific embodiments. It should be noted that, without departing from the concept of the present invention, various modifications and improvements can be made to these specific embodiments, all of which fall within the scope of protection of this application. Therefore, the scope of protection of this patent application should be determined by the appended claims.

Claims

1. A device for carbon fixation of steel slag, characterized in that, include: A silo for storing and conveying steel slag powder; A liquid storage tank for storing and transporting the catalyst for the reaction; The liquid outlet of the liquid storage tank is connected to the atomizing chamber via an atomizing spray gun, and the atomizing chamber is connected to the carbon dioxide emission pipe of the factory via a pipeline to mix the catalyst with the carbon dioxide flue gas. The reactor has a hopper connected to the reactor inlet via a feeding mechanism, and the outlet of the atomizing chamber connected to the reactor. A discharge device, wherein the discharge device is connected to the discharge port of the reactor; A dust removal device, which is connected to the reactor.

2. The apparatus for carbon fixation of steel slag according to claim 1, characterized in that: The reactor is equipped with stirring blades, which are spirally distributed on the conveyor shaft of the reactor. The conveyor shaft is connected to a variable frequency motor.

3. The apparatus for carbon fixation of steel slag according to claim 1, characterized in that: The feeding mechanism includes a metering belt, which is located below the outlet of the hopper. A conveyor belt is located at the end of the metering belt in the conveying direction, and the end of the conveyor belt in the conveying direction is connected to the inlet of the reactor.

4. The apparatus for carbon fixation of steel slag according to claim 1, characterized in that: The liquid outlet of the liquid storage tank is connected to an atomizing spray gun via a delivery pump, and the outlet of the atomizing spray gun is placed in the atomization chamber.

5. The apparatus for carbon fixation of steel slag according to claim 1, characterized in that: The atomizing chamber is also connected to an air intake pipe, which is connected to the factory's carbon dioxide emission pipe, and a gas regulating valve is installed on the air intake pipe.

6. The apparatus for carbon fixation of steel slag according to claim 1, characterized in that: The outlet of the silo is equipped with a first valve and a second valve connected in series. The first valve is a slide gate valve, and the second valve is a rotary valve.

7. The apparatus for carbon fixation of steel slag according to claim 1, characterized in that: The dust removal device includes a dust collector, which is connected to the inside of the reactor and is used to remove unreacted flue gas and airborne materials in the reactor. The gas outlet of the dust collector is connected to a fan, and the material outlet of the dust collector is connected to a discharge device.

8. The apparatus for carbon fixation of steel slag according to claim 7, characterized in that: The discharge equipment is a screw conveyor.

9. The apparatus for carbon fixation of steel slag according to claim 7, characterized in that: The dust collector is a bag filter.

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