A bottom water injection steel slag pretreatment device capable of synergistic carbon sequestration

Abstract

The application discloses a bottom water injection steel slag pretreatment device capable of synergistically fixing carbon. An opening is arranged at the top of a slag pool, a cover body is hinged to the edge of the slag pool, a driving mechanism is installed on the ground and connected to the cover body, a first CO2 concentration detection unit is arranged on the cover body, a water supply and drainage system comprises a water pipeline connected to the bottom of the slag pool, a first valve arranged on the water pipeline and a first flow meter, and a kiln waste gas gas supply system comprises a gas delivery pipeline connected to the bottom of the slag pool, a second valve arranged on the gas delivery pipeline, a second flow meter and a second CO2 concentration detection unit. The application reduces the CO2 emission of enterprises, helps to alleviate the greenhouse effect, further reduces the content of free calcium oxide and magnesium oxide in the steel slag, improves the stability of the subsequent steel slag tailings, and significantly improves the resource utilization value of the tailings.

Description

Technical Field

[0001] This application relates to the field of steel slag pretreatment in the metallurgical industry, and in particular to a bottom-injection water-based steel slag pretreatment device that can synergistically fix carbon. Background Technology

[0002] During the steelmaking process, a large amount of steel slag is generated. Steel slag contains a high proportion of unstable alkaline oxides, such as calcium oxide, which can reach over 30%, as well as a certain amount of free magnesium oxide. These free oxides not only affect the stability of the steel slag tailings and reduce its resource utilization value, but may also undergo hydration reactions in the natural environment, leading to volume expansion and causing harm to the surrounding environment and engineering structures.

[0003] Meanwhile, numerous industrial kilns used in steel smelting, such as lime kilns and steel rolling heating furnaces, emit large amounts of flue gas containing a high proportion of CO2 during operation. If this flue gas is directly released into the atmosphere, it will not only cause greenhouse gas emissions and exacerbate global climate change, but also lead to a waste of resources.

[0004] Therefore, the challenges of steel slag treatment and industrial kiln flue gas emissions during steel smelting are intertwined, causing severe environmental damage and hindering the sustainable development of the steel industry. Thus, developing a device that can effectively treat steel slag and rationally utilize kiln flue gas is of significant practical importance and urgency. Utility Model Content

[0005] This application provides a bottom-injection water-based steel slag pretreatment device that can synergistically fix carbon, thereby solving the problems mentioned in the background art.

[0006] This application provides a bottom-injection water-filled steel slag pretreatment device that can synergistically fix carbon, including:

[0007] A steel slag pretreatment system includes a slag-sealing tank, a cover, a drive mechanism, and a first CO2 concentration detection unit. The top of the slag-sealing tank has an opening, and the cover is hinged to the edge of the slag-sealing tank. The drive mechanism is installed on the ground and connected to the cover, used to drive the cover to open and close the opening. The first CO2 concentration detection unit is located on the cover and used to monitor the CO2 concentration in the upper part of the slag-sealing tank in real time.

[0008] The water supply and drainage system includes a water pipe connecting to the bottom of the slag pool, a first valve and a first flow meter installed on the water pipe;

[0009] The kiln exhaust gas supply system includes a gas delivery pipeline connected to the bottom of the slag-sealing pool, a second valve installed on the gas delivery pipeline, a second flow meter, and a second CO2 concentration detection unit; the gas delivery pipeline is connected to a CO2-containing exhaust gas source of the industrial kiln.

[0010] The water supply and drainage system is configured to keep the steel slag completely submerged in the high-temperature water body, and the kiln exhaust gas supply system is configured to introduce CO2-containing exhaust gas into the high-temperature water body. The first CO2 concentration detection unit is connected to the second valve signal to dynamically adjust the CO2 supply.

[0011] In one possible implementation, the slag-sealing tank includes a concrete tank body, a metal liner fixed to the inner wall of the slag-sealing tank, and a heat-resistant insulation layer filled between the metal liner and the inner wall of the slag-sealing tank.

[0012] In one possible implementation, the cover is a double-layered hollow structure with a cooling medium inlet and outlet at the top for circulating the cooling medium.

[0013] In one possible implementation, the drive mechanism includes a fixed bracket, a winch, a first pulley, a second pulley, and a cable; the fixed bracket is fixed to the ground and close to the slag pit; the winch is mounted on the fixed bracket; the first pulley is mounted on the fixed bracket and located above the winch; the second pulley is mounted on the top of the cover; the cable is wound around the winch and then sequentially connected to the first pulley, the second pulley, and the cover.

[0014] In one possible implementation, the metal liner is a steel billet.

[0015] In one possible implementation, the bottom-injected water-filled steel slag pretreatment device with synergistic carbon fixation further includes a plurality of pressure relief holes disposed on the top of the cover body, and a pressure relief cover hinged to the cover body and covering the corresponding pressure relief holes.

[0016] One or more technical solutions provided in the embodiments of this application have at least the following technical effects:

[0017] The bottom-injection water-based steel slag pretreatment device with synergistic carbon fixation provided in this application includes a steel slag pretreatment system, a water supply and drainage system, and a kiln exhaust gas supply system. During the slag-sealing stage, a unique operating method is adopted: continuous water supply from the bottom of the slag-sealing pool, with no drainage throughout the entire process, successfully creating a special environment of high-temperature boiling water immersion. This application fully utilizes the favorable conditions of high temperature and humidity and high porosity of the steel slag, creating an excellent opportunity for injecting industrial kiln exhaust gas from the bottom of the slag-sealing pool. In this environment, the industrial kiln exhaust gas can penetrate deeply into the steel slag, achieving comprehensive, uniform, and sufficient contact with it, thereby promoting a highly efficient reaction between CO2 in the exhaust gas and free oxides in the steel slag, generating stable products such as calcium carbonate and magnesium carbonate. Through this process, on the one hand, CO2 emissions from enterprises are reduced, helping to mitigate the greenhouse effect; on the other hand, the content of free calcium oxide and magnesium oxide in the steel slag is further reduced, improving the stability of subsequent steel slag tailings and significantly enhancing the resource utilization value of the tailings. Furthermore, this technical solution effectively improves the overall quality and efficiency of steel slag pretreatment, providing strong support for the green and sustainable development of the steel industry. Furthermore, the water supply and drainage system of this application works in conjunction with the kiln exhaust gas supply system. With the help of the first valve, the second valve, the first flow meter, the second flow meter, the first CO2 concentration detection unit, and the second CO2 concentration detection unit, the water supply speed and CO2 supply can be precisely and dynamically adjusted. The pretreatment process can be flexibly controlled according to actual process requirements, ensuring stable and reliable pretreatment, realizing the resource recycling of CO2-containing exhaust gas from industrial kilns, and achieving both economic and environmental benefits. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments of this application will be briefly introduced below. Obviously, the accompanying drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the bottom-injected water-filled steel slag pretreatment device that can synergistically fix carbon, provided in an embodiment of this application.

[0020] Icons: 1-Steel slag pretreatment system; 11-Slag sump; 12-Cover; 121-Pressure relief hole; 122-Pressure relief cover; 13-Drive mechanism; 131-Fixed bracket; 132-Winch; 133-First pulley; 134-Second pulley; 135-Cable; 14-First CO2 concentration detection unit; 2-Water supply and drainage system; 21-Water pipeline; 22-First valve; 23-First flow meter; 3-Kiln exhaust gas supply system; 31-Gas transmission pipeline; 32-Second valve; 33-Second flow meter; 34-Second CO2 concentration detection unit. Detailed Implementation

[0021] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0022] In the description of the embodiments of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the embodiments of this application and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. The terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Furthermore, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application according to the specific circumstances.

[0023] This application provides a bottom-injection water-filled steel slag pretreatment device that can synergistically fix carbon, such as... Figure 1As shown. This bottom-injection water-filled steel slag pretreatment device with synergistic carbon fixation includes a steel slag pretreatment system 1, a water supply and drainage system 2, and a kiln exhaust gas supply system 3. The steel slag pretreatment system 1 includes a slag-sealing tank 11, a cover 12, a drive mechanism 13, and a first CO2 concentration detection unit 14. The top of the slag-sealing tank 11 has an opening, and the cover 12 is hinged to the edge of the slag-sealing tank 11. The drive mechanism 13 is installed on the ground and connected to the cover 12 for driving the cover 12 to open and close the opening. The first CO2 concentration detection unit 14 is located on the cover 12 for real-time monitoring of the CO2 concentration in the upper part of the slag-sealing tank 11. The water supply and drainage system 2 includes a water pipe 21 connecting to the bottom of the slag-sealing tank 11, a first valve 22 installed on the water pipe 21, and a first flow meter 23. The water pipe 21 is connected to a water pump. The kiln exhaust gas supply system 3 includes a gas delivery pipeline 31 connected to the bottom of the slag-filling pool 11, a second valve 32 installed on the gas delivery pipeline 31, a second flow meter 33, and a second CO2 concentration detection unit 34. The gas delivery pipeline 31 is connected to the CO2-containing exhaust gas source of the industrial kiln. In the complex process of steel smelting, a large number of industrial kilns operate continuously and generate a large amount of flue gas. Tests show that the CO2 content in the flue gas emitted from lime kilns is approximately 25-35%, and the CO2 content in the flue gas emitted from steel rolling heating furnaces is approximately 10-20%, indicating a high proportion of CO2 in the flue gas emitted by these devices. To achieve effective utilization and scientific treatment of these flue gases, a specialized collection device is needed to collect them for subsequent operations. The water supply and drainage system 2 is configured to maintain the steel slag completely submerged in high-temperature water, and the kiln exhaust gas supply system 3 is configured to introduce CO2-containing exhaust gas into the high-temperature water. The first CO2 concentration detection unit 14 is connected to the second valve 32 to dynamically adjust the CO2 supply.

[0024] In the embodiments of this application, the first valve 22 and the second valve 32 are both electrically controlled valves, and the controller is electrically connected to the first valve 22, the second valve 32, the first CO2 concentration detection unit 14, the second CO2 concentration detection unit 34, the first flow meter 23 and the second flow meter 33, respectively.

[0025] This application improves upon the existing bottom-water slag pretreatment technology. During the slag treatment stage, a unique operating method is adopted: continuous water supply from the bottom of the slag-sealing tank 11, with no drainage throughout the entire process, successfully creating a special environment of high-temperature boiling water immersion. This application fully utilizes the favorable conditions of high temperature and humidity, and high porosity of steel slag, creating an excellent opportunity to inject industrial kiln exhaust gas from the bottom of the slag-sealing tank 11. Under this environment, the industrial kiln exhaust gas can penetrate deeply into the steel slag, achieving comprehensive, uniform, and sufficient contact, thereby promoting a highly efficient reaction between CO2 in the exhaust gas and free oxides in the steel slag, generating stable products such as calcium carbonate and magnesium carbonate. Through this process, on the one hand, CO2 emissions from enterprises are reduced, helping to mitigate the greenhouse effect; on the other hand, the content of free calcium oxide and magnesium oxide in the steel slag is further reduced, improving the stability of subsequent steel slag tailings and significantly enhancing the resource utilization value of the tailings. Furthermore, this technical solution effectively improves the overall quality and efficiency of steel slag pretreatment, providing strong support for the green and sustainable development of the steel industry. Furthermore, the water supply and drainage system 2 of this application works in conjunction with the kiln exhaust gas supply system 3. With the help of the first valve 22, the second valve 32, the first flow meter 23, the second flow meter 33, the first CO2 concentration detection unit 14, and the second CO2 concentration detection unit 34, the water supply speed and CO2 supply can be precisely and dynamically adjusted. The pretreatment process can be flexibly controlled according to the actual process requirements, ensuring that the pretreatment is stable and reliable, realizing the resource recycling of CO2-containing exhaust gas from industrial kilns, and achieving both economic and environmental benefits.

[0026] The working principle of this application is as follows: In the opening stage, the cover 12 on the slag-sealing tank 11 is opened by the drive mechanism 13, and the steel slag is placed in the slag-sealing tank 11 and then closed; in the water supply stage, the water supply and drainage system 2 is started, the water pump delivers water from the bottom of the slag-sealing tank 11 through the water pipeline 21, the first valve 22 regulates the water supply speed, and the first flow meter 23 feeds back data to the controller in real time to adjust the opening of the first valve 22, ensuring that the steel slag is fully submerged in high-temperature water; in the gas supply stage, the kiln exhaust gas supply system 3 operates, and the CO2-containing exhaust gas generated by the industrial kiln is transported through the gas conveyor. Pipeline 31 leads to the high-temperature water at the bottom of the slag-sealing tank 11. The first CO2 concentration detection unit 14 monitors the CO2 concentration at the top of the slag-sealing tank 11 in real time and feeds it back to the controller. The controller adjusts the opening of the second valve 32 accordingly to dynamically control the CO2 supply. The second flow meter 33 measures the total amount of CO2. The second CO2 concentration detection unit 34, in conjunction with the second flow meter 33, calculates the total amount delivered to ensure accurate and controllable pretreatment. During the reaction stage, under the combined action of high-temperature water and CO2-containing waste gas, the free oxides in the steel slag react fully to complete the pretreatment.

[0027] The bottom-injection water-filled steel slag pretreatment device for synergistic carbon fixation proposed in this application has significant advantages: In terms of investment cost, as a cost-effective option among mainstream processes, it only requires investment in pipeline materials, construction costs, and a small amount of instrumentation and control system costs to guide kiln exhaust gas to the bottom of the slag-fixing pool 11 for carbon fixation, with investment costs significantly lower than other carbon fixation technologies; In terms of carbon fixation effect, the slag-fixing process has advantages such as high temperature, high water-to-solid ratio, and good steel slag granulation effect, which is conducive to the reaction of CO2 with alkaline oxides in steel slag. After carbon fixation, the free calcium oxide content in the steel slag can be reduced by 1-2 percentage points compared with the non-carbon fixation process, effectively reducing the carbon emissions of enterprises; In terms of economic benefits, the free calcium oxide (f-CaO) and free magnesium oxide (f-MgO) content in the steel slag tailings after carbon fixation, crushing, and magnetic separation can be stably reduced to below 2%, with significantly improved stability, greatly enhancing the resource utilization value of steel slag tailings in the building materials industry. In this embodiment of the application, the slag-sealing tank 11 includes a concrete tank body, a metal liner fixed to the inner wall of the slag-sealing tank 11, and a heat-resistant insulation layer filled between the metal liner and the inner wall of the slag-sealing tank 11.

[0028] The metal lining is made of steel billets, and to ensure good structural strength and performance, the thickness of the steel billets is set to be no less than 150mm. Furthermore, a 150mm gap is left between the steel billet and the inner wall of the concrete pool. This gap is filled with heat-resistant concrete, further enhancing the insulation effect and effectively protecting the inner wall of the concrete pool from damage caused by high temperatures and other factors.

[0029] In this embodiment, the cover 12 is a double-layered hollow structure, with a cooling medium inlet and outlet at the top for circulating the cooling medium.

[0030] It should be noted that the cover body 12 is made of Q235B steel. This double-layer hollow structure has a unique function: during the slag sealing operation, cooling medium can be introduced into it through the cooling medium inlet. After circulating within the double-layer space, the cooling medium flows out through the cooling medium outlet, thereby effectively removing heat and protecting the cover body 12 from high-temperature damage generated during slag sealing, ensuring that the cover body 12 can operate stably and reliably under high-temperature conditions.

[0031] In this embodiment, the drive mechanism 13 includes a fixed bracket 131, a winch 132, a first pulley 133, a second pulley 134, and a cable 135. The fixed bracket 131 is made of Q235B steel and is securely fixed to the ground near the slag pit 11. The winch 132 is mounted on the fixed bracket 131. The first pulley 133 is mounted on the fixed bracket 131 and located above the winch 132. The second pulley 134 is mounted on the top of the cover 12. The cable 135 is wound around the winch 132 and sequentially connected to the first pulley 133, the second pulley 134, and the cover 12. When the winch 132 operates, the first pulley 133 and the second pulley 134 change the direction of force on the cable 135, thereby using the cable 135 to drive the cover 12 to achieve opening and closing control.

[0032] In this embodiment, the bottom-injected water-filled steel slag pretreatment device that can synergistically fix carbon also includes a plurality of pressure relief holes 121 disposed on the top of the cover 12, and a pressure relief cover 122 hinged to the cover 12 and covering the corresponding pressure relief holes 121.

[0033] It should be noted that during the steel slag pretreatment process, a large amount of gas is generated in the slag-sealing tank 11 due to chemical reactions, causing the internal pressure to rise. Multiple pressure relief holes 121 provide a release channel for the gas, preventing excessive pressure accumulation from damaging the slag-sealing tank 11 and the cover 12, thus ensuring the structural safety of the device. The hinged pressure relief cover 122 can automatically open and close according to the pressure in the slag-sealing tank 11. When the pressure reaches a certain level, the gas pushes open the pressure relief cover 122 and is discharged, achieving automatic pressure relief. When the pressure decreases, the pressure relief cover 122 can automatically fall back to cover the pressure relief holes 121, preventing external impurities from entering the slag-sealing tank 11, ensuring the stability of the steel slag pretreatment environment, and improving the reliability and treatment effect of the entire bottom-injection steel slag pretreatment device with synergistic carbon fixation.

[0034] The various embodiments in this specification are described in a progressive manner. For the same or similar parts between the various embodiments, please refer to each other. Each embodiment focuses on describing the differences from other embodiments.

[0035] The above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit this application. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of this application.

Claims

1. A bottom-injection water-filled steel slag pretreatment device with synergistic carbon fixation, characterized in that, include: A steel slag pretreatment system (1) includes a slag-sealing tank (11), a cover (12), a drive mechanism (13), and a first CO2 concentration detection unit (14). The top of the slag-sealing tank (11) is provided with an opening, and the cover (12) is hinged to the edge of the slag-sealing tank (11). The drive mechanism (13) is installed on the ground and connected to the cover (12) for driving the cover (12) to open and close the opening. The first CO2 concentration detection unit (14) is provided on the cover (12) for real-time monitoring of the CO2 concentration at the top of the slag-sealing tank (11). The water supply and drainage system (2) includes a water pipe (21) connecting to the bottom of the slag pool (11), a first valve (22) and a first flow meter (23) installed on the water pipe (21); The kiln exhaust gas supply system (3) includes a gas transmission pipeline (31) connected to the bottom of the slag pool (11), a second valve (32) installed on the gas transmission pipeline (31), a second flow meter (33) and a second CO2 concentration detection unit (34); the gas transmission pipeline (31) is connected to the CO2 exhaust gas source of the industrial kiln; The water supply and drainage system (2) is configured to keep the steel slag completely submerged in the high-temperature water body, and the kiln exhaust gas supply system (3) is configured to introduce CO2-containing exhaust gas into the high-temperature water body. The first CO2 concentration detection unit (14) is connected to the second valve (32) to dynamically adjust the CO2 supply.

2. The bottom-injection water-filled steel slag pretreatment device with synergistic carbon fixation according to claim 1, characterized in that, The slag-sealing tank (11) includes a concrete tank body, a metal liner fixed to the inner wall of the slag-sealing tank (11), and a heat-resistant insulation layer filled between the metal liner and the inner wall of the slag-sealing tank (11).

3. The bottom-injection water-filled steel slag pretreatment device with synergistic carbon fixation according to claim 1, characterized in that, The cover (12) is a double-layer hollow structure with a cooling medium inlet and outlet at the top for circulating the cooling medium.

4. The bottom-injection water-filled steel slag pretreatment device with synergistic carbon fixation according to claim 1, characterized in that, The drive mechanism (13) includes a fixed bracket (131), a winch (132), a first pulley (133), a second pulley (134), and a cable (135); The fixed bracket (131) is fixed to the ground and close to the slag pool (11); The winch (132) is mounted on the fixed bracket (131); The first pulley (133) is mounted on the fixed bracket (131) and is located above the winch (132); The second pulley (134) is mounted on the top of the cover (12); The cable (135) is wound around the winch (132) and then connected in sequence to the first pulley (133), the second pulley (134) and the cover (12).

5. The bottom-injection water-filled steel slag pretreatment device with synergistic carbon fixation according to claim 2, characterized in that, The metal liner is a steel billet.

6. The bottom-injection water-filled steel slag pretreatment device with synergistic carbon fixation according to claim 1, characterized in that, It also includes a plurality of pressure relief holes (121) disposed on the top of the cover (12), and a pressure relief cap (122) hinged to the cover (12) and covering the corresponding pressure relief holes (121).

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