Carbon sequestration system

Abstract

The utility model relates to the technical field of material science, in particular to a carbon sequestration system. The carbon sequestration system comprises a feeding assembly, a first reactor, a second reactor and carbon supply equipment, the feeding assembly is used for providing steel slag powder, the first reactor is connected to the downstream side of the feeding assembly and used for receiving the steel slag powder conveyed by the feeding assembly, and the second reactor is connected to the downstream side of the first reactor and used for receiving the steel slag powder conveyed by the feeding assembly. The second reactor is connected with the first reactor and used for receiving the steel slag powder conveyed by the first reactor, the carbon supply equipment is connected with the first reactor and used for conveying carbon dioxide-containing flue gas to the first reactor, so that the steel slag powder in the first reactor and carbon dioxide in the carbon dioxide-containing flue gas are subjected to primary carbonation reaction, and the carbon supply equipment is connected with the second reactor and used for conveying carbon dioxide in the second reactor. And the second reactor is used for conveying carbon dioxide-containing flue gas to the second reactor, so that the steel slag powder in the second reactor and carbon dioxide in the carbon dioxide-containing flue gas are subjected to secondary carbonation reaction. The carbonation efficiency of the steel slag powder in the carbon sequestration system is high, and the carbon sequestration rate is high.

Description

Technical Field

[0001] The utility model relates to the technical field of materials science, in particular to a carbon fixation system. Background Art

[0002] Due to the stability and activity of steel slag, it has not yet been used on a large scale in the building materials industry. Studies have shown that carbonation of steel slag can effectively improve its stability and activity, while reducing carbon emissions.

[0003] However, the existing steel slag carbonation technology has low efficiency, high cost and low carbon fixation rate, which seriously hinders the large-scale application process. Utility Model Content

[0004] The main purpose of the utility model is to provide a carbon fixation system, aiming to solve the technical problems of low efficiency, high cost and low carbon fixation rate of the existing steel slag carbonation technology.

[0005] In order to achieve the above-mentioned purpose, the utility model proposes a carbon fixation system for carbonating steel slag powder, comprising:

[0006] A feeding assembly, the feeding assembly is used to provide steel slag powder;

[0007] a first reactor, the first reactor being connected to the downstream side of the feeding assembly and being used for receiving the steel slag powder conveyed by the feeding assembly;

[0008] a second reactor, the second reactor being connected to the downstream side of the first reactor and being used for receiving the steel slag powder transmitted by the first reactor;

[0009] A carbon supply device, which is connected to the first reactor and is used to transport the carbon dioxide-containing flue gas to the first reactor so that the steel slag powder in the first reactor and the carbon dioxide in the carbon dioxide-containing flue gas undergo a primary carbonation reaction. The carbon supply device is connected to the second reactor and is used to transport the carbon dioxide-containing flue gas to the second reactor so that the steel slag powder in the second reactor and the carbon dioxide in the carbon dioxide-containing flue gas undergo a secondary carbonation reaction.

[0010] In some embodiments, the feeding assembly comprises:

[0011] A storage bin, the storage bin is used to store the steel slag powder;

[0012] A first conveying device, connected to the downstream side of the storage bin, for receiving and conveying the steel slag powder discharged from the storage bin;

[0013] A metering bin is connected to the downstream side of the first conveying device through a bucket lift, and is used to weigh the mass of the steel slag powder conveyed by the first conveying device. The metering bin is connected to the first reactor to convey the weighed steel slag powder to the first reactor.

[0014] In some embodiments, the metering bin and the first reactor are provided with:

[0015] A second conveying device, connected to the downstream side of the metering bin, for receiving and conveying the steel slag powder discharged from the metering bin;

[0016] A spraying device, wherein the spraying device has a spray head, and the spray head is arranged in the direction of the second conveying device, and is used for spraying microbial liquid onto the steel slag powder on the second conveying device;

[0017] Wherein, the second conveying device is connected to the first reactor to convey the steel slag powder sprayed with microbial liquid to the first reactor.

[0018] In some embodiments, the second conveying equipment includes a shaft screw conveyor, which is used to tumble the steel slag powder sprayed with microbial liquid. The shaft screw conveyor is tilted toward the direction of the first reactor, and the angle α between the axis of the shaft screw conveyor and the horizontal direction satisfies: 6°≤α≤12°.

[0019] In some embodiments, the first reactor comprises:

[0020] A primary reaction chamber, wherein the primary reaction chamber has a first feed port, a first discharge port and a first gas outlet, wherein the first feed port is connected to the second conveying device, and the first gas outlet is connected to the second reactor;

[0021] A secondary reaction chamber, wherein the secondary reaction chamber has a second feed port, a second discharge port, and a second gas outlet, wherein the second feed port is connected to the first discharge port, the second discharge port is connected to the second reactor, and the second gas outlet is connected to the first feed port;

[0022] Among them, the steel slag powder and the carbon dioxide-containing flue gas enter the primary reaction chamber from the first feed port, and after the steel slag powder and the carbon dioxide-containing flue gas undergo carbonation reaction in the primary reaction chamber, the steel slag powder is discharged from the primary reaction chamber from the first discharge port, and the carbon dioxide-containing flue gas is discharged from the primary reaction chamber from the first gas outlet, and the steel slag powder and the carbon dioxide-containing flue gas enter the secondary reaction chamber from the second feed port, and after the steel slag powder and the carbon dioxide-containing flue gas undergo carbonation reaction in the secondary reaction chamber, the steel slag powder is discharged from the secondary reaction chamber from the second discharge port, and the carbon dioxide-containing flue gas is discharged from the secondary reaction chamber from the second gas outlet.

[0023] In some embodiments, the second reactor has a third feed port, a third discharge port, a first air inlet, and a second air inlet. Along the height direction of the second reactor, the first air inlet is disposed at the bottom of the second reactor, the third feed port is disposed between the first air inlet and the second air inlet, and the third discharge port is disposed at the top of the second reactor;

[0024] Among them, the third feed port is connected to the second feed port, the first air inlet is connected to the carbon supply device, the second air inlet is connected to the first air outlet, and the air intake volume of the first air inlet is greater than the air intake volume of the second air inlet.

[0025] In some embodiments, at the first air inlet, the second reactor is provided with a plurality of grids, and the plurality of grids form an arc-shaped structure as a whole;

[0026] Wherein, the spacing distance L between two adjacent grids satisfies: 150mm≤L≤250mm.

[0027] In some embodiments, the carbon fixation system further comprises a separation device, the separation device is connected to the downstream side of the second reactor, and the separation device has a fourth feed port, a fourth discharge port and a first return port;

[0028] Wherein, the second reactor has a second return port, the fourth feed port is connected to the third discharge port, and the first return port is connected to the second return port.

[0029] In some embodiments, the carbon fixation system further comprises a collecting device, the collecting device is connected to the downstream side of the separation device, and the collecting device has a fifth feed inlet, a fifth discharge port, and a third gas outlet;

[0030] Among them, the fifth feed port is connected to the fourth discharge port, the fifth discharge port is used to discharge the steel slag powder in the collecting device, and the third gas outlet is used to discharge the carbon dioxide-containing flue gas in the collecting device.

[0031] In some embodiments, the carbon supply equipment is provided with a cold air valve, which is used to adjust the concentration and temperature of the carbon dioxide-containing flue gas transported by the carbon supply equipment to the first reactor and the second reactor, so that the concentration C of the transported carbon dioxide-containing flue gas satisfies: 10%≤C≤20%, and the temperature T of the transported carbon dioxide-containing flue gas satisfies: 30℃≤T≤70℃.

[0032] Compared with the prior art, the beneficial effects of the utility model are:

[0033] In the technical solution of the utility model, firstly, steel slag powder is introduced into the first reactor through the feeding assembly, and at the same time, flue gas containing carbon dioxide is introduced into the first reactor through the carbon supply device. When the steel slag powder and the carbon dioxide in the flue gas containing carbon dioxide contact in the first reactor, since the steel slag powder is a typical calcium / magnesium-rich industrial byproduct, the high calcium, magnesium content and high alkalinity make the steel slag powder have good carbonization performance and carbon dioxide sequestration capacity, so in the first reactor, the steel slag powder and carbon dioxide contact will undergo a carbonation reaction, so that the steel slag powder can undergo a primary carbon fixation reaction in the first reactor. After the steel slag powder undergoes a primary carbonation reaction in the first reactor, it will be transferred to the second reactor. At the same time, flue gas containing carbon dioxide is introduced into the second reactor through the carbon supply device. When the steel slag powder and carbon dioxide contact in the second reactor, a carbonation reaction will also occur, so that the steel slag powder can undergo a secondary carbon fixation reaction in the second reactor.

[0034] In the utility model, steel slag powder and carbon dioxide gas can undergo a primary carbon fixation reaction in the first reactor (it can also be understood that steel slag powder and carbon dioxide gas can undergo a pre-carbon fixation reaction in the first reactor), and then the steel slag powder and carbon dioxide gas can undergo a secondary carbon fixation reaction in the second reactor (it can also be understood that steel slag powder and carbon dioxide gas can undergo a formal carbon fixation reaction in the second reactor). Through the two carbon fixation reactions, the carbonation efficiency of the steel slag powder can be greatly improved, and the carbon fixation rate of the steel slag powder can be improved, thereby improving the stability and activity of the steel slag powder, so as to facilitate the subsequent preparation of the steel slag powder into cement gel material, or the application of the steel slag powder in other ways to achieve the recycling of the steel slag powder.

[0035] In the utility model, steel slag blocks are crushed into powder to form steel slag powder. When the steel slag powder and carbon dioxide gas are subjected to carbonation reaction, the steel slag powder is mainly transported in the gas phase to have fluid properties, thereby increasing the contact area between the steel slag powder and the carbon dioxide gas, accelerating the carbonization process of the steel slag powder, and improving the carbon fixation efficiency of the steel slag powder.

[0036] In addition, from a thermodynamic point of view, the silicate minerals, calcium oxide and magnesium oxide in the steel slag powder react with carbon dioxide to form carbonates. These are all exothermic reactions that can proceed spontaneously, so there is no need to set up additional heating equipment, which can effectively reduce production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0038] Figure 1 A schematic diagram of the overall structure of a carbon fixation system provided in one embodiment of the utility model;

[0039] Figure 2 A schematic diagram of the overall structure of a carbon fixation system provided by another embodiment of the utility model;

[0040] Figure 3 for Figure 2 A partial enlarged view of the middle A;

[0041] Figure 4 A schematic diagram of the structure of the second reactor in the carbon fixation system provided in one embodiment of the utility model.

[0042] Description of Figure Numbers:

[0043] 100-feeding assembly;

[0044] 110-storage bin; 120-first conveying equipment; 130-metering bin; 140-bucket lift;

[0045] 200-first reactor;

[0046] 210-primary reaction chamber; 220-secondary reaction chamber;

[0047] 211-first feed inlet; 212-first discharge outlet; 213-first gas outlet; 221-second feed inlet; 222-second discharge outlet; 223-second gas outlet;

[0048] 300-second reactor;

[0049] 310 - third feed port; 320 - third discharge port; 330 - first air inlet; 340 - second air inlet; 350 - second return port; 360 - grille;

[0050] 400-Carbon supply equipment;

[0051] 410-cold air valve;

[0052] 500- second conveying equipment;

[0053] 600-Spraying equipment;

[0054] 610-first blending tank; 620-second blending tank; 630-microorganism liquid storage tank; 640-delivery pump; 650-sprinkler;

[0055] 700-Separation equipment;

[0056] 710- fourth feed port; 720- fourth discharge port; 730- first return port;

[0057] 800- Collection equipment;

[0058] 810 - the fifth feed inlet; 820 - the fifth discharge outlet; 830 - the third air outlet.

[0059] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0060] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0061] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back...), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0062] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the utility model, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of the features. In addition, if "and / or", "and / or" or "and / or" appears in the full text, its meaning includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme that satisfies both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the utility model.

[0063] Due to the stability and activity of steel slag, it has not yet been used on a large scale in the building materials industry. Studies have shown that carbonation of steel slag can effectively improve its stability and activity, while reducing carbon emissions.

[0064] However, the existing steel slag carbonation technology has low efficiency, high cost and low carbon fixation rate, which seriously hinders the large-scale application process.

[0065] In order to solve the technical problems of low efficiency, high cost and low carbon fixation rate of existing steel slag carbonation technology, Figures 1 to 4 According to an embodiment of the utility model, a carbon fixation system is provided for carbonating steel slag powder. The carbon fixation system comprises a feeding assembly 100, a first reactor 200, a second reactor 300 and a carbon supply device 400. The feeding assembly 100 is used to provide steel slag powder. The first reactor 200 is connected to the downstream side of the feeding assembly 100 for receiving the steel slag powder transmitted by the feeding assembly 100. The second reactor 300 is connected to the downstream side of the first reactor 200 for receiving the steel slag powder transmitted by the first reactor 200. The carbon supply device 400 is connected to the first reactor 200 for conveying carbon dioxide-containing flue gas to the first reactor 200 so that the steel slag powder in the first reactor 200 and the carbon dioxide in the carbon dioxide-containing flue gas undergo a primary carbonation reaction. The carbon supply device 400 is connected to the second reactor 300 for conveying carbon dioxide-containing flue gas to the second reactor 300 so that the steel slag powder in the second reactor 300 and the carbon dioxide in the carbon dioxide-containing flue gas undergo a secondary carbonation reaction.

[0066] Specifically, in order to improve the stability and activity of steel slag, increase the utilization rate of steel slag, and reduce the pressure of steel slag on land, environment and resources, in this embodiment, steel slag powder is first introduced into the first reactor 200 through the feeding assembly 100, and at the same time, carbon dioxide-containing flue gas is introduced into the first reactor 200 through the carbon supply equipment 400. When the steel slag powder and the carbon dioxide in the carbon dioxide-containing flue gas come into contact in the first reactor 200, since the steel slag powder is a typical calcium / magnesium-rich industrial by-product, the high calcium and magnesium content and high alkalinity make the steel slag powder have good carbonization properties and carbon dioxide storage capacity. Therefore, in the first reactor 200, a carbonation reaction will occur after the steel slag powder and carbon dioxide come into contact, so that the steel slag powder can undergo a primary carbon fixation reaction in the first reactor 200. After the steel slag powder undergoes primary carbonation reaction in the first reactor 200, it will be transferred to the second reactor 300. At the same time, carbon dioxide-containing flue gas is introduced into the second reactor 300 through the carbon supply equipment 400. When the steel slag powder and carbon dioxide come into contact in the second reactor 300, a carbonation reaction will also occur, allowing the steel slag powder to undergo secondary carbon fixation reaction in the second reactor 300.

[0067] In this embodiment, refer to Figure 1 to Figure 2 , steel slag powder and carbon dioxide gas can undergo a primary carbon fixation reaction in the first reactor 200 (it can also be understood that steel slag powder and carbon dioxide gas can undergo a pre-carbon fixation reaction in the first reactor 200), and then the steel slag powder and carbon dioxide gas can undergo a secondary carbon fixation reaction in the second reactor 300 (it can also be understood that steel slag powder and carbon dioxide gas can undergo a formal carbon fixation reaction in the second reactor 300). Through the two carbon fixation reactions, the carbonation efficiency of the steel slag powder can be greatly improved, and the carbon fixation rate of the steel slag powder can be improved, thereby improving the stability and activity of the steel slag powder, so as to facilitate the subsequent production of the steel slag powder into cement gel material, or the application of the steel slag powder in other ways to achieve the recycling of the steel slag powder.

[0068] In this embodiment, the steel slag blocks are crushed into powder to form steel slag powder. When the steel slag powder and carbon dioxide gas are subjected to carbonation reaction, the steel slag powder is mainly transported in the gas phase so that it has fluid properties, thereby increasing the contact area between the steel slag powder and the carbon dioxide gas, accelerating the carbonization process of the steel slag powder, and improving the carbon fixation efficiency of the steel slag powder.

[0069] In addition, from a thermodynamic point of view, the silicate minerals, calcium oxide and magnesium oxide in the steel slag powder react with carbon dioxide to form carbonates. These are all exothermic reactions that can proceed spontaneously, so there is no need to set up additional heating equipment, which can effectively reduce production costs.

[0070] In some embodiments, the carbon supply device 400 can be a cement kiln exhaust system. In view of the fact that steel slag is a typical calcium / magnesium-rich industrial byproduct, its high calcium, magnesium content and high alkalinity make it have good carbonization performance and carbon dioxide sequestration capacity, and the cement kiln will produce flue gas containing carbon dioxide (the concentration of carbon dioxide in the flue gas is approximately 20%-30%) due to the clinker calcination process. By transporting the flue gas containing carbon dioxide generated by the cement kiln exhaust system to the first reactor 200 and the second reactor 300, the steel slag powder in the first reactor 200 and the second reactor 300 can react with the carbon dioxide in the flue gas for carbonation. On the one hand, the cement kiln flue gas can provide enough carbon elements for the steel slag powder to react with carbon, thereby improving the stability and activity of the steel slag powder after carbon fixation. On the other hand, the steel slag powder can consume carbon dioxide in the cement kiln flue gas, thereby reducing greenhouse gas emissions and reducing the pollution of the cement kiln flue gas to the natural environment.

[0071] In some embodiments, reference Figure 1 to Figure 2 The feeding assembly 100 includes a storage bin 110, a first conveying device 120 and a metering bin 130. The storage bin 110 is used to store steel slag powder. The first conveying device 120 is connected to the downstream side of the storage bin 110, and is used to receive and convey the steel slag powder discharged from the storage bin 110. The metering bin 130 is connected to the downstream side of the first conveying device 120 through a bucket lift 140, and is used to weigh the mass of the steel slag powder conveyed by the first conveying device 120. The metering bin 130 is connected to the first reactor 200 to convey the weighed steel slag powder to the first reactor 200.

[0072] Specifically, since the weight ratio between steel slag powder and carbon dioxide affects the efficiency of the carbonation reaction of steel slag powder, in order to ensure that the reaction rate between steel slag powder and carbon dioxide can reach the optimal value, in this embodiment, before the steel slag powder is introduced into the first reactor 200, the required mass of steel slag powder can be calculated in advance according to the demand for carbon dioxide to be introduced into the first reactor 200 (if the carbon supply equipment 400 is a cement kiln exhaust system, it can be separated according to the carbon dioxide content in the production flue gas), and then the corresponding mass of steel slag powder is weighed out through the bucket elevator 140, and the above-mentioned corresponding mass of steel slag powder is transported from the storage bin 110 to the metering bin 130, and the steel slag powder in the metering bin 130 is supplied to the first reactor 200 for use.

[0073] The steel slag powder transported to the first reactor 200 is weighed so that the steel slag powder and carbon dioxide in the first reactor 200 are in an optimal matching state, which can ensure the carbon fixation efficiency and effect of the steel slag powder, and prevent the situation where the steel slag powder transported to the first reactor 200 exceeds the required mass of steel slag powder, resulting in insufficient carbon dioxide in the first reactor 200 to react with the steel slag powder for carbonation, thereby affecting the carbon fixation effect of the steel slag powder; and prevent the situation where the steel slag powder transported to the first reactor 200 is less than the required mass of steel slag powder, resulting in excess carbon dioxide in the first reactor 200 that cannot react with the steel slag powder for carbonation, thereby affecting the overall efficiency of carbon fixation of the steel slag powder.

[0074] In some embodiments, when the steel slag powder is transported to the storage bin 110, the steel slag powder may be transported into the storage bin 110 by the pneumatic transport pump 640. The first transport device 120 may be a belt conveyor.

[0075] In some embodiments, reference Figure 1 to Figure 2 A second conveying device 500 and a spraying device 600 are provided between the metering bin 130 and the first reactor 200. The second conveying device 500 is connected to the downstream side of the metering bin 130, and is used to receive and convey the steel slag powder discharged from the metering bin 130. The spraying device 600 has a nozzle 650, which is arranged in the direction of the second conveying device 500 and is used to spray the microbial liquid onto the steel slag powder on the second conveying device 500. The second conveying device 500 is connected to the first reactor 200 to convey the steel slag powder sprayed with the microbial liquid to the first reactor 200.

[0076] Specifically, in order to further accelerate the rate at which free CaO, MgO and carbon dioxide in the steel slag powder react to form carbonates and improve the carbon fixation efficiency of the steel slag powder, in this embodiment, the steel slag powder is not directly transported from the metering bin 130 to the first reactor 200 for carbon fixation reaction, but firstly transported to the second transporting device 500. In the process of the second transporting device 500 transporting the steel slag powder to the first reactor 200, the spraying device 600 sprays the microbial liquid to the steel slag powder through the nozzle 650, so that the steel slag powder sprayed with the microbial liquid enters the first reactor 200. The microbial liquid here is equivalent to a "catalyst" that accelerates the carbon fixation reaction of the steel slag powder. By spraying the microbial liquid on the surface of the steel slag powder, the rate of carbonation reaction between the steel slag powder and carbon dioxide can be greatly increased, the production efficiency of the steel slag powder can be improved, and the carbon fixation effect of the steel slag powder can be optimized.

[0077] In some embodiments, reference Figure 1 to Figure 2In order to prepare the microbial liquid and spray the prepared microbial liquid onto the steel slag powder, the spraying device 600 may include a first preparation tank 610, a second preparation tank 620 and a microbial liquid storage tank 630. The first preparation tank 610 is connected to the microbial liquid storage tank 630, the second preparation tank 620 is connected to the microbial liquid storage tank 630, and the first preparation tank 610 and the second preparation tank 620 are connected in parallel. When preparing the microbial liquid, a mixture of a first microorganism and distilled water may be injected into the first preparation tank 610 to form a first stock solution, and a mixture of a second microorganism and distilled water may be injected into the second preparation tank 620 to form a second stock solution, wherein the first microorganism and the second microorganism are different types of microorganisms, and the first stock solution and the second stock solution will eventually be mixed in the microbial liquid storage tank 630 to form a microbial liquid. When it is not necessary to spray the microbial liquid onto the steel slag powder, the microbial liquid is stored in the microbial liquid storage tank 630. When it is necessary to spray the microbial liquid onto the steel slag powder, the microbial liquid in the microbial liquid storage tank 630 can be pumped to the nozzle 650 by the delivery pump 640, and the microbial liquid is sprayed onto the steel slag powder by the nozzle 650.

[0078] Furthermore, the first stock solution is contained in the first mixing tank 610 and the second stock solution is contained in the second mixing tank 620, instead of mixing the first stock solution and the second stock solution directly in the microbial liquid storage tank 630, so as to accurately control the ratio of the first stock solution and the second stock solution in the microbial liquid and ensure the preparation quality of the microbial liquid.

[0079] In some embodiments, the second conveying device 500 includes a shaft screw conveyor, which is used to roll the steel slag powder sprayed with the microbial liquid, and the shaft screw conveyor is tilted toward the first reactor 200, and the angle α between the axis of the shaft screw conveyor and the horizontal direction satisfies: 6°≤α≤12°. Exemplarily, for example, the value of α can be 6°, 7°, 8°, 9°, 10°, 11°, 12°, etc.

[0080] Specifically, in order to improve the mixing uniformity of steel slag powder and microbial liquid, in this embodiment, the steel slag powder can be continuously tumbled in the shafted screw conveyor. During the tumbling process, the steel slag powder can not only be in all-round contact with the microbial liquid, which is beneficial to improve the spraying uniformity of the microbial liquid, but the steel slag powder can also be in contact with the microbial liquid sprayed on the side wall of the shafted screw conveyor, effectively utilizing the microbial liquid on the shafted screw conveyor and avoiding waste of the microbial liquid.

[0081] Furthermore, since steel slag powder may cause agglomeration effect when in contact with microbial liquid, that is, the steel slag powder will stick together, the shaft screw conveyor is tilted toward the first reactor 200, which is beneficial to transporting the steel slag powder in the shaft screw conveyor to the first reactor 200.

[0082] It should be noted that the shaft screw conveyor is a conventional device in this field, so the specific structure of the shaft screw conveyor will not be described in detail here.

[0083] In some embodiments, reference Figures 2 to 3 The first reactor 200 includes a primary reaction chamber 210 and a secondary reaction chamber 220. The primary reaction chamber 210 has a first feed port 211, a first discharge port 212 and a first gas outlet 213. The first feed port 211 is connected to the second conveying device 500, and the first gas outlet 213 is connected to the second reactor 300. The secondary reaction chamber 220 has a second feed port 221, a second discharge port 222 and a second gas outlet 223. The second feed port 221 is connected to the first discharge port 212, the second discharge port 222 is connected to the second reactor 300, and the second gas outlet 223 is connected to the first feed port 211. Among them, steel slag powder and carbon dioxide-containing flue gas enter the primary reaction chamber 210 from the first feed port 211, and after the steel slag powder and the carbon dioxide-containing flue gas undergo carbonation reaction in the primary reaction chamber 210, the steel slag powder is discharged from the primary reaction chamber 210 from the first discharge port 212, and the carbon dioxide-containing flue gas is discharged from the primary reaction chamber 210 from the first gas outlet 213, and the steel slag powder and the carbon dioxide-containing flue gas enter the secondary reaction chamber 220 from the second feed port 221, and after the steel slag powder and the carbon dioxide-containing flue gas undergo carbonation reaction in the secondary reaction chamber 220, the steel slag powder is discharged from the secondary reaction chamber 220 from the second discharge port 222, and the carbon dioxide-containing flue gas is discharged from the secondary reaction chamber 220 from the second gas outlet 223.

[0084] Specifically, referring to the above-mentioned embodiment, since the steel slag powder may cause agglomeration effect when contacting with the microbial liquid, that is, the steel slag powder will stick together, the steel slag powder and the carbon dioxide gas will not be fully contacted in the first reactor 200, affecting the efficiency of the carbon fixation reaction of the steel slag powder. In this embodiment, in the primary reaction chamber 210 and the secondary reaction chamber 220, the steel slag powder can undergo a carbonation reaction with carbon dioxide in advance, and the agglomerated steel slag powder can be broken up by the carbon dioxide gas. In the process of dispersing the steel slag powder, the steel slag powder and the carbon dioxide gas are fully contacted, and a mineralization reaction occurs in advance, which is beneficial to improving the carbon fixation efficiency of the steel slag powder.

[0085] Further, refer to Figure 2Regarding the flow path of the steel slag powder between the primary reaction bin 210 and the secondary reaction bin 220: Since the secondary reaction bin 220 is arranged on the downstream side of the primary reaction bin 210, the steel slag powder first enters the primary reaction bin 210 from the first feed port 211, and after carbonation reaction occurs with carbon dioxide in the primary reaction bin 210, the steel slag powder is discharged from the primary reaction bin 210 from the first discharge port 212, and enters the secondary reaction bin 220 from the second feed port 221. After carbonation reaction occurs with carbon dioxide in the secondary reaction bin 220, the steel slag powder is discharged from the secondary reaction bin 220 from the second discharge port 222, and continues to be transported to the second reactor 300. Regarding the flow path of carbon dioxide between the primary reaction chamber 210 and the secondary reaction chamber 220: carbon dioxide first flows from the carbon supply device 400 into the secondary reaction chamber 220 through the second feed port 221. After carbonation reaction occurs with steel slag powder in the secondary reaction chamber 220, the carbon dioxide is discharged from the secondary reaction chamber 220 through the second gas outlet 223, and enters the primary reaction chamber 210 through the first feed port 211. After carbonation reaction occurs with steel slag powder in the primary reaction chamber 210, the carbon dioxide is discharged from the primary reaction chamber 210 through the first gas outlet 213, and continues to be transported to the second reactor 300.

[0086] Among them, between the primary reaction chamber 210 and the secondary reaction chamber 220, the steel slag powder and the carbon dioxide have opposite transmission paths, and the reverse flow is beneficial to make the contact between the steel slag powder and the carbon dioxide more complete, thereby helping to improve the carbon fixation efficiency of the steel slag powder.

[0087] In some embodiments, the first feed port 211 and the first gas outlet 213 can be distributed on opposite sides of the primary reaction chamber 210, so that the flow path of carbon dioxide in the primary reaction chamber 210 can be extended, which is conducive to carbon dioxide filling the entire primary reaction chamber 210, increasing the reaction time of steel slag powder and carbon dioxide in the primary reaction chamber 210, and improving the carbon fixation effect of steel slag powder. Similarly, the second feed port 221 and the second gas outlet 223 can be distributed on opposite sides of the secondary reaction chamber 220, so that the flow path of carbon dioxide in the secondary reaction chamber 220 can be extended, which is conducive to carbon dioxide filling the entire secondary reaction chamber 220, increasing the reaction time of steel slag powder and carbon dioxide in the secondary reaction chamber 220, and improving the carbon fixation effect of steel slag powder.

[0088] In some embodiments, reference Figure 1 to Figure 2The second reactor 300 has a third feed port 310, a third discharge port 320, a first air inlet 330 and a second air inlet 340. Along the height direction of the second reactor 300, the first air inlet 330 is arranged at the bottom of the second reactor 300, the third feed port 310 is arranged between the first air inlet 330 and the second air inlet 340, and the third discharge port 320 is arranged at the top of the second reactor 300. Among them, the third feed port 310 is connected to the second discharge port 222, the first air inlet 330 is connected to the carbon supply device 400, the second air inlet 340 is connected to the first air outlet 213, and the air intake of the first air inlet 330 is greater than the air intake of the second air inlet 340.

[0089] Specifically, referring to the above embodiment, the steel slag powder discharged from the secondary reaction chamber 220 will enter the interior of the second reactor 300 through the third feed port 310, and the carbon dioxide discharged from the primary reaction chamber 210 will enter the interior of the second reactor 300 through the second air inlet 340, so that the steel slag powder and carbon dioxide can continue to undergo carbonation reaction in the second reactor 300. At the same time, carbon dioxide can also be transmitted to the second reactor 300 from the first air inlet 330, and the intake amount of carbon dioxide at the first air inlet 330 is greater than the intake amount of carbon dioxide at the second air inlet 340. For example, 2 / 3 of the carbon dioxide in the second reactor 300 can be introduced through the first air inlet 330, and 1 / 3 of the carbon dioxide in the second reactor 300 can be introduced through the second air inlet 340.

[0090] Furthermore, since the first air inlet 330 is arranged at the bottom of the second reactor 300 and the third feed port 310 is arranged between the first air inlet 330 and the second air inlet 340, after the steel slag powder is introduced into the second reactor 300 from the third feed port 310 and the carbon dioxide is introduced into the second reactor 300 from the first air inlet 330 and the second air inlet 340, the second reactor 300 will present a pneumatically conveyed dilute phase fluidized state in the form of gradient suspension, so that the steel slag powder will be suspended in the second reactor 300, which is beneficial to increase the gas-solid contact area between the steel slag powder and carbon dioxide and improve the efficiency of separating and solidifying carbon dioxide in the second reactor 300.

[0091] Furthermore, in the dilute phase fluidized state of pneumatic conveying, free CaO and MgO in the steel slag powder react with carbon dioxide to form carbonates. As the mineralization reaction continues, the carbon-containing components in the cement kiln flue gas are separated and solidified on the surface of the steel slag powder in the form of carbonates. A large amount of steel slag powder particles are carried upward by the flue gas and are finally discharged from the third discharge port 320.

[0092] In some embodiments, reference Figure 4At the first air inlet 330, the second reactor 300 is provided with a plurality of grilles 360, and the plurality of grilles 360 form an arc-shaped structure as a whole. The spacing distance L between two adjacent grilles 360 satisfies: 150 mm ≤ L ≤ 250 mm. For example, the value of L can be 150 mm, 180 mm, 200 mm, 230 mm, 250 mm, etc.

[0093] Specifically, in this embodiment, at the first air inlet 330, 10 to 20 (including the end value) grids 360 can be provided on the second reactor 300. The diameter of the grid 360 can be 100 mm. By providing the grid 360, the carbon dioxide gas can be evenly transported into the second reactor 300 to ensure that the second reactor 300 is in a turbulent state.

[0094] Furthermore, the operating parameters of the second reactor 300 include: under the reaction conditions of 30-70°C, the residence time of the pretreated steel slag powder in the second reactor 300 is 2-4 minutes, the solid-gas residence time ratio is set to 1 / 20, so the gas residence time is 6-12 seconds, and the average suspension wind speed in the second reactor 300 is set to 4-7 m / s.

[0095] In some embodiments, reference Figure 1 to Figure 2 The carbon fixation system further includes a separation device 700, which is connected to the downstream side of the second reactor 300, and has a fourth feed port 710, a fourth discharge port 720, and a first return port 730. The second reactor 300 has a second return port 350, the fourth feed port 710 is connected to the third discharge port 320, and the first return port 730 is connected to the second return port 350.

[0096] Specifically, referring to the above embodiment, the steel slag powder and carbon dioxide discharged from the second reactor 300 will enter the separation device 700 in a suspended state through the fourth feed port 710, and the gas and solid in the separation device 700 will be in a cyclone state. A small amount of large steel slag powder will return to the second reactor 300 from the first return port 730 of the separation device 700, and continue to undergo carbonation reaction in the second reactor 300. Most of the steel slag powder will enter the product collection system along with the decarbonization flue gas, thereby realizing the collection and utilization of the steel slag powder.

[0097] The separation device 700 can screen out a small amount of coarse-grained, agglomerated large steel slag powder. By returning the large steel slag powder to the second reactor 300 for reaction, it is beneficial for the large steel slag powder to fully contact with carbon dioxide and undergo mineralization reaction with carbon dioxide again, thereby improving the carbon fixation effect of the steel slag powder.

[0098] In some embodiments, reference Figure 1 to Figure 2The carbon fixation system further includes a collecting device 800, which is connected to the downstream side of the separation device 700, and has a fifth feed port 810, a fifth discharge port 820 and a third gas outlet 830. The fifth feed port 810 is connected to the fourth discharge port 720, the fifth discharge port 820 is used to discharge the steel slag powder in the collecting device 800, and the third gas outlet 830 is used to discharge the flue gas containing carbon dioxide in the collecting device 800.

[0099] Specifically, referring to the above embodiment, the steel slag powder and carbon dioxide discharged from the separation device 700 will enter the collection device 800 in a suspended state through the fifth feed port 810, and the steel slag powder will be discharged from the collection device 800 through the fifth discharge port 820, and after dust collection, it will be transported to the cement mill for the preparation of cement binder, and the carbon dioxide will be directly discharged into the atmosphere through the third outlet port 830.

[0100] In some embodiments, reference Figure 1 to Figure 2 The carbon supply device 400 is provided with a cold air valve 410, which is used to adjust the concentration and temperature of the flue gas containing carbon dioxide delivered by the carbon supply device 400 to the first reactor 200 and the second reactor 300, so that the concentration C of the delivered flue gas containing carbon dioxide satisfies: 10%≤C≤20%, and the temperature T of the delivered flue gas containing carbon dioxide satisfies: 30°C≤T≤70°C. Exemplarily, for example, the value of C can be 10%, 13%, 15%, 17%, 20%, etc., and the value of T can be 30°C, 40°C, 50°C, 60°C, 70°C, etc.

[0101] It should be noted that other contents of the carbon fixation system disclosed in the utility model can be referred to the prior art and will not be repeated here. In addition, the various structural devices in the carbon fixation system disclosed in the utility model can be connected to each other through a conveying pipeline to realize the transmission of steel slag powder or carbon dioxide between the various structural devices. The downstream side in the carbon fixation system disclosed in the utility model refers to the direction of transmission of steel slag powder or carbon dioxide.

[0102] The above are only preferred embodiments of the present invention, and do not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the utility model concept, or directly / indirectly used in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. Carbon fixation system, used for carbonation treatment of steel slag powder, characterized in that: include: A feeding assembly, the feeding assembly is used to provide steel slag powder; a first reactor, the first reactor being connected to the downstream side of the feeding assembly and being used for receiving the steel slag powder conveyed by the feeding assembly; a second reactor, the second reactor being connected to the downstream side of the first reactor and being used for receiving the steel slag powder transmitted by the first reactor; A carbon supply device, which is connected to the first reactor and is used to transport the carbon dioxide-containing flue gas to the first reactor so that the steel slag powder in the first reactor and the carbon dioxide in the carbon dioxide-containing flue gas undergo a primary carbonation reaction. The carbon supply device is connected to the second reactor and is used to transport the carbon dioxide-containing flue gas to the second reactor so that the steel slag powder in the second reactor and the carbon dioxide in the carbon dioxide-containing flue gas undergo a secondary carbonation reaction.

2. The carbon fixation system according to claim 1, characterized in that: The feeding assembly comprises: a storage bin, the storage bin is used to store the steel slag powder; A first conveying device, connected to the downstream side of the storage bin, for receiving and conveying the steel slag powder discharged from the storage bin; A metering bin is connected to the downstream side of the first conveying device through a bucket lift, and is used to weigh the mass of the steel slag powder conveyed by the first conveying device. The metering bin is connected to the first reactor to convey the weighed steel slag powder to the first reactor.

3. The carbon fixation system according to claim 2, characterized in that: Between the metering bin and the first reactor is arranged: A second conveying device, connected to the downstream side of the metering bin, for receiving and conveying the steel slag powder discharged from the metering bin; A spraying device, wherein the spraying device has a spray head, and the spray head is arranged in the direction of the second conveying device, and is used for spraying microbial liquid onto the steel slag powder on the second conveying device; Wherein, the second conveying device is connected to the first reactor to convey the steel slag powder sprayed with microbial liquid to the first reactor.

4. The carbon fixation system according to claim 3, characterized in that: The second conveying equipment includes a shaft screw conveyor, which is used to tumble the steel slag powder sprayed with microbial liquid. The shaft screw conveyor is tilted toward the direction of the first reactor, and the angle α between the axis of the shaft screw conveyor and the horizontal direction satisfies: 6°≤α≤12°.

5. The carbon fixation system according to claim 3, characterized in that: The first reactor comprises: A primary reaction chamber, wherein the primary reaction chamber has a first feed port, a first discharge port and a first gas outlet, wherein the first feed port is connected to the second conveying device, and the first gas outlet is connected to the second reactor; A secondary reaction chamber, wherein the secondary reaction chamber has a second feed port, a second discharge port, and a second gas outlet, wherein the second feed port is connected to the first discharge port, the second discharge port is connected to the second reactor, and the second gas outlet is connected to the first feed port; Among them, the steel slag powder and the carbon dioxide-containing flue gas enter the primary reaction chamber from the first feed port, and after the steel slag powder and the carbon dioxide-containing flue gas undergo carbonation reaction in the primary reaction chamber, the steel slag powder is discharged from the primary reaction chamber from the first discharge port, and the carbon dioxide-containing flue gas is discharged from the primary reaction chamber from the first gas outlet, and the steel slag powder and the carbon dioxide-containing flue gas enter the secondary reaction chamber from the second feed port, and after the steel slag powder and the carbon dioxide-containing flue gas undergo carbonation reaction in the secondary reaction chamber, the steel slag powder is discharged from the secondary reaction chamber from the second discharge port, and the carbon dioxide-containing flue gas is discharged from the secondary reaction chamber from the second gas outlet.

6. The carbon fixation system according to claim 5, characterized in that: The second reactor has a third feed port, a third discharge port, a first air inlet and a second air inlet. Along the height direction of the second reactor, the first air inlet is arranged at the bottom of the second reactor, the third feed port is arranged between the first air inlet and the second air inlet, and the third discharge port is arranged at the top of the second reactor; Among them, the third feed port is connected to the second feed port, the first air inlet is connected to the carbon supply device, the second air inlet is connected to the first air outlet, and the air intake volume of the first air inlet is greater than the air intake volume of the second air inlet.

7. The carbon fixation system according to claim 6, characterized in that: The second reactor is provided with a plurality of grids at the first air inlet, and the plurality of grids form an arc-shaped structure as a whole; Wherein, the spacing distance L between two adjacent grids satisfies: 150mm≤L≤250mm.

8. The carbon fixation system according to claim 6, characterized in that: The carbon fixation system further includes a separation device, which is connected to the downstream side of the second reactor, and has a fourth feed inlet, a fourth discharge outlet, and a first return outlet; Wherein, the second reactor has a second return port, the fourth feed port is connected to the third discharge port, and the first return port is connected to the second return port.

9. The carbon fixation system according to claim 8, characterized in that: The carbon fixation system further comprises a collecting device, which is connected to the downstream side of the separation device, and has a fifth feed inlet, a fifth discharge outlet and a third gas outlet; Among them, the fifth feed port is connected to the fourth discharge port, the fifth discharge port is used to discharge the steel slag powder in the collecting device, and the third gas outlet is used to discharge the carbon dioxide-containing flue gas in the collecting device.

10. The carbon fixation system according to any one of claims 1 to 9, characterized in that: The carbon supply equipment is provided with a cold air valve, which is used to adjust the concentration and temperature of the carbon dioxide-containing flue gas transported by the carbon supply equipment to the first reactor and the second reactor, so that the concentration C of the transported carbon dioxide-containing flue gas satisfies: 10%≤C≤20%, and the temperature T of the transported carbon dioxide-containing flue gas satisfies: 30℃≤T≤70℃.

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