Carbon dioxide sealing device

Abstract

The utility model provides a carbon dioxide sealing and storing device which solves the technical problems that an existing carbon dioxide sealing and storing device is large in leaching solution loss, low in speed and low in carbonation efficiency. According to the utility model, the two reaction tanks are communicated by using the booster pump, the sufficient reaction is promoted by arranging the steel slag pretreatment unit, the heating unit, the power unit and the CO2 equipartition device, and the leaching of Ca < 2 + > and Mg < 2 + > is promoted mainly by reducing the granularity of the steel slag (10-50 meshes) through steel slag pretreatment and raising the temperature (60-80 DEG C) by using the heating unit, so that the leaching efficiency is improved; the residual heat kept by the leaching solution entering the reaction tank II can further accelerate the precipitation of carbonate precipitates, and the carbonation efficiency is further improved due to the auxiliary effect that carbon dioxide gas is uniformly introduced into the carbon dioxide equipartition device. The carbon dioxide sealing and storing device designed by the utility model is simple and compact in structure and simple to operate.

Description

Technical Field

[0001] The utility model belongs to the technical field of carbon dioxide gas sealing, and in particular relates to a carbon dioxide sealing device. Background Art

[0002] In the context of dual carbon, carbon capture and storage (CCS) includes various carbon dioxide capture, separation, transportation and storage technologies, and is a potential strategy to reduce carbon dioxide emissions. CCS includes carbon sequestration technologies such as geological storage, marine storage and mineral carbonation (MC). Geological storage technology has many uncertain risks such as CO2 leakage, ecological imbalance, groundwater pollution, and even geological disasters. Marine storage technology has the problem that high concentrations of CO2 in seawater will kill marine life and cause dissolved CO2 to eventually return to the environment. MC technology has the advantages of permanent storage of carbon dioxide, production of value-added products and environmental friendliness, and plays a key role in CO2 storage.

[0003] Steel slag is one of the main contributors to solid waste in the steel industry. The utilization rate of steel slag in my country is only about 5%. Steel slag has high alkalinity (pH is about 12) and contains a large amount of calcium and magnesium oxides, which can be used as a carrier for capturing CO2. Compared with natural minerals, it has higher reactivity and inherent alkalinity, making it more suitable for mineralizing CO2. It is estimated that steel slag worldwide can store up to 171Mt of CO2 per year.

[0004] Mineral carbonation plays an important role in rebalancing the global carbon cycle and providing long-term carbon storage solutions. The main methods of using steel slag mineralization to solidify CO2 are currently divided into direct mineralization and indirect mineralization. Among them, the direct mineralization process is simple, but the reaction kinetics are relatively slow, requiring higher reaction temperatures and pressures, and high energy consumption. The indirect mineralization method has mild reaction conditions, higher mineralization efficiency, and purer products. However, whether it is direct mineralization or indirect mineralization, the devices that use steel slag to seal carbon dioxide in flue gas have problems such as large leaching solution loss, low rate, and low carbonation efficiency.

[0005] Therefore, there is an urgent need to design a device with low CO2 storage cost and improved storage efficiency to solve the problems existing in the prior art. Summary of the invention

[0006] The utility model aims to solve the shortcomings of the existing carbon dioxide storage device, such as large loss of leaching liquid, low rate and low carbonation efficiency, and provide a carbon dioxide storage device.

[0007] To achieve the above purpose, the technical solution provided by the utility model is:

[0008] A carbon dioxide storage device, which is special in that it includes a slag pretreatment unit, a leaching unit, a leaching liquid conveying unit, a carbonation unit and a pulverizer;

[0009] The slag pretreatment unit is used to crush the slag into 10-50 meshes and then transport it to the leaching unit, so that the slag can be fully contacted with the leaching liquid through the smaller particle size of the slag;

[0010] The leaching unit comprises a reaction tank I, a slag feed port, a stop valve I, a power stirring component I, a heating component and a liquid outlet valve I;

[0011] The steel slag feed port and stop valve I are both arranged at the top of the reaction tank I, and are used to transport the steel slag and the acid solution for leaching the steel slag into the reaction tank I respectively; that is, the reaction tank I is filled with the steel slag and the acid solution for leaching the steel slag;

[0012] The power stirring assembly I is arranged in the reaction tank I, and is used to stir the reaction liquid formed by the steel slag and the acid solution to accelerate the leaching efficiency;

[0013] The heating assembly is arranged on the outer wall of the reaction tank I, and is used to heat the reaction system in the reaction tank I to accelerate the Ca 2+ Mg 2+ The dissolution rate of plasma is preferably at a heating temperature of 60 to 80°C;

[0014] The liquid outlet valve I is arranged at the bottom of the reaction tank I, and is used to discharge the waste after the reaction of the steel slag and the acid solution;

[0015] The leachate delivery unit is used to deliver the leachate generated by the reaction of the steel slag and the acid solution to the carbonation unit, and comprises a delivery pipeline and a first valve, a booster pump and a second valve sequentially arranged on the delivery pipeline along the leachate delivery direction; wherein the inlet of the delivery pipeline extends into the reaction liquid of the reaction tank I, and the first valve serves as a switch of the leachate outlet of the reaction tank I;

[0016] The carbonation unit comprises a reaction tank II, a stop valve II, a carbon dioxide inlet assembly, a power stirring assembly II, and a liquid outlet valve II;

[0017] The outlet of the delivery pipeline extends into the reaction tank II; that is, the reaction tank II contains the leachate delivered by the reaction tank I, and the second valve serves as a switch for the leachate inlet of the reaction tank II;

[0018] The stop valve II is arranged at the top of the reaction tank II, and is used to transport inhibitors (to inhibit the interference of silicates) and shielding agents (to shield Al 3+ , Fe 3+ Plasma) and pH adjuster (to adjust the pH of the extract to 12-13);

[0019] The carbon dioxide intake assembly includes a carbon dioxide intake pipe and a carbon dioxide equalizer; the carbon dioxide intake pipe is installed on the side wall of the tank body of the reaction tank II, and an intake valve is provided near the inlet thereof, and the outlet thereof is connected to the carbon dioxide equalizer; the carbon dioxide equalizer is horizontally arranged at a position near the bottom of the reaction tank II, and the carbon dioxide equalizer includes a plurality of equalizer pipes; the plurality of equalizer pipes are evenly distributed radially with the outlet of the carbon dioxide intake pipe as the center, and a plurality of air outlet holes are opened along the length direction of each equalizer pipe, which are used to evenly transport carbon dioxide to the leaching liquid, so that the carbon dioxide is fully in contact with the leaching liquid, thereby improving the carbonation efficiency;

[0020] The power stirring assembly II is arranged in the reaction tank II and is located above the carbon dioxide equalizer, and is used to stir the leaching liquid and further cooperate with the carbon dioxide equalizer to improve the carbonation efficiency;

[0021] The liquid outlet valve II is arranged at the bottom of the reaction tank II to collect carbonate precipitation;

[0022] The bottoms of the reaction tanks I and II are both grooved, which encourage waste and carbonate precipitation to gather toward the liquid outlet valves I and II so as to collect waste and carbonate; the bottoms of the reaction tanks I and II are both provided with supporting legs to make room for collecting materials for the liquid outlet valves I and II.

[0023] Furthermore, the slag pretreatment unit is a crusher for reducing the particle size of the slag, and its outlet is connected to the slag feed port of the reaction tank I.

[0024] Furthermore, the heating component includes a power supply and a heating coil; the heating coil is wound around the outer wall of the reaction tank I, and the power supply provides electrical energy to the heating coil, so that the heating coil heats the reaction tank I to a target temperature.

[0025] Furthermore, the power stirring assembly I and the power stirring assembly II have the same structure, both including a motor, a rotating shaft and an agitator; the motor drives the rotating shaft to drive the agitator to rotate, so as to fully stir the reaction materials in the two reaction tanks and promote complete reaction.

[0026] Furthermore, a filter screen is provided at the inlet of the delivery pipeline to prevent waste materials in the reaction tank I from being sucked in, thereby increasing the life of the pump.

[0027] Furthermore, the carbon dioxide equalizer includes 8 equalizer pipes.

[0028] Furthermore, the acidic reagent is acetic acid, the inhibitor is potassium fluoride, the shielding agent is triethanolamine, and the pH regulator is sodium hydroxide.

[0029] Furthermore, reaction tank I and reaction tank II, booster pump, delivery pipeline and other components that can directly contact acidic or alkaline solutions are made of corrosion-resistant materials to improve the durability of the equipment.

[0030] The advantages of the utility model are:

[0031] 1. The carbon dioxide storage device designed by the utility model has a simple and compact structure and is easy to operate. It uses a booster pump to connect two reaction tanks to work. The steel slag pretreatment unit, heating unit, power unit and CO2 equalizer are set to promote the reaction to proceed fully. The steel slag is first pretreated to reduce the slag particle size (10-50 mesh) and the heating unit is used to increase the temperature (60-80°C) to promote Ca 2+ Mg 2+ Plasma leaching to increase the Ca content in the solution 2+ Mg 2+ Compared with the existing technology, the efficiency of plasma leaching is lower than that of the existing technology, on the basis of the same leaching rate and leaching efficiency. In addition, the residual temperature of the leaching solution entering the reaction tank II will further accelerate the precipitation of carbonate precipitation, and the auxiliary effect of the carbon dioxide gas evenly introduced by the carbon dioxide distributor further improves the carbonation efficiency. In the reaction tank I, the Ca-rich slag is extracted from the steel slag by an acidic solution. 2+ Mg 2+ The plasma leaching liquid is transported to reaction tank II, and then in an alkaline environment, it undergoes a carbonation reaction with CO2 to generate a precipitate, thereby converting CO2 into inorganic minerals to achieve stable storage of CO2 and realize the effective and rational utilization of waste resources.

[0032] 2. The carbon dioxide storage device designed in the utility model can efficiently convert carbon dioxide into a large amount of stable solid carbon, permanently seal it for reuse, and achieve CO2 emission reduction while obtaining inorganic chemical products with certain value, thereby reducing emission costs and increasing economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a structural schematic diagram of the sealing device of the utility model;

[0034] Figure 2 It is a structural schematic diagram of the carbon dioxide equalizer in the sealing device of the utility model.

[0035] The reference numerals are as follows:

[0036] 1-reaction tank I, 2-steel slag feed port, 3-agitator, 4-stop valve I, 5-heating coil, 6-first valve, 7-liquid outlet pipe, 8-boosting pump, 9-reaction tank II, 10-motor, 11-carbon dioxide equalizer, 12-second valve, 13-stop valve II, 14-inlet valve, 15-liquid outlet valve II, 16-rotating shaft, 17-power stirring assembly, 18-transportation pipeline, 19-liquid outlet valve I, 20-power supply, 21-crusher, 22-equalizing pipe, 23-air outlet. DETAILED DESCRIPTION

[0037] The following is a further detailed description of the present invention in conjunction with the accompanying drawings and specific embodiments:

[0038] Figure 1 As shown, a carbon dioxide storage device includes a slag pretreatment unit, a leaching unit, a leaching liquid conveying unit, a carbonation unit and a pulverizer.

[0039] The slag pretreatment unit is a crusher, the purpose of which is to reduce the slag particle size to 10-50 mesh and transport it to the slag feed port of the reaction tank I.

[0040] The leaching unit includes a reaction tank I, a slag feed port, a stop valve I, a power stirring assembly I, a heating assembly, and a liquid outlet valve I. The slag feed port and the stop valve I are both arranged at the top of the reaction tank I, and are used to transport the slag reduced in size by a crusher and the acetic acid solution for leaching the slag into the reaction tank I, respectively. The power stirring assembly I is arranged in the reaction tank I, and is used to stir the reaction liquid formed by the slag and the acid solution to accelerate the Ca 2+ Mg 2+ The heating assembly includes a power supply and a heating coil; the heating coil is wound around the outer wall of the reaction tank I, and the power supply is installed on the outer wall of the reaction tank I to provide electrical energy to the heating coil, so that the heating coil heats the reaction liquid in the reaction tank I to the target temperature of 60-80°C to accelerate the removal of Ca in the steel slag. 2+ Mg 2+ The dissolution rate of plasma. The liquid outlet valve I is arranged at the bottom of the reaction tank I to discharge the waste after the reaction of steel slag and acid solution. The reaction tank I is cylindrical, and the inside of the tank bottom is grooved to promote the waste to gather to the liquid outlet valve I so as to collect the waste. The outside of the tank bottom is provided with supporting legs to support the tank body and make space for the liquid outlet valve I to collect the waste.

[0041] The leachate delivery unit is used to deliver the leachate generated after the reaction of steel slag and acid solution to the carbonation unit, and comprises a delivery pipeline and a first valve, a booster pump and a second valve sequentially arranged on the delivery pipeline along the leachate delivery direction; wherein, the inlet of the delivery pipeline extends into the reaction liquid of the reaction tank I, and a filter screen is arranged at the inlet to prevent waste from entering, and the first valve serves as a switch for the leachate outlet of the reaction tank I.

[0042] The carbonation unit includes a reaction tank II, a stop valve II, a carbon dioxide inlet assembly, a power stirring assembly II, and a liquid outlet valve II. The outlet of the delivery pipeline extends into the reaction tank II (the outlet of the delivery pipeline is arranged on the upper side of the tank body wall of the reaction tank II); the second valve is used as a switch for the leachate inlet of the reaction tank II. The stop valve II is arranged on the top of the reaction tank II, and is used to deliver the inhibitor potassium fluoride (to inhibit the interference of silicates), the shielding agent triethanolamine (to shield Al 3+ , Fe 3+ The carbon dioxide inlet assembly includes a carbon dioxide inlet pipe and a carbon dioxide equalizer; the carbon dioxide inlet pipe is installed on the side wall of the tank body of the reaction tank II, and an inlet valve is arranged near the inlet, and the outlet is connected to the carbon dioxide equalizer; the carbon dioxide equalizer is arranged horizontally near the bottom of the reaction tank II, such as Figure 2 As shown, the carbon dioxide distributor includes 8 distributors; the 8 distributors are evenly distributed radially with the outlet of the carbon dioxide inlet pipe as the center, and each distributor is provided with a plurality of outlet holes along the length direction (the specific number of outlet holes can be set according to the length of the distributor, and the radial dimension of the entire carbon dioxide distributor is slightly less than or equal to the radial dimension of the reaction tank II), which is used to uniformly transport carbon dioxide to the leaching liquid, so that carbon dioxide and the leaching liquid are evenly and fully contacted to improve the carbonation efficiency. The power stirring assembly II is arranged in the reaction tank II and is located above the carbon dioxide distributor, and is further used to stir the leaching liquid, and cooperate with the carbon dioxide distributor to improve the carbonation efficiency. The liquid outlet valve II is arranged at the bottom of the reaction tank II for collecting carbonate precipitation; the reaction tank II is cylindrical, and the inside of the tank bottom is grooved, which promotes the carbonate precipitation to gather toward the liquid outlet valve II, so as to collect carbonate, and the outside of the tank bottom is provided with a support leg, which supports the tank body and makes room for the liquid outlet valve II to collect carbonate precipitation. The collected carbonate can be processed to obtain a fine carbonate product.

[0043] The above-mentioned power stirring assembly I and power stirring assembly II have the same structure, both including a motor, a rotating shaft and a stirrer; the motor drives the rotating shaft to drive the stirrer to rotate, fully stirring the reaction materials in the two reaction tanks to promote complete reaction.

[0044] The above-mentioned reaction tank I and reaction tank II, booster pump, delivery pipeline and other components that can directly contact acidic or alkaline solutions are all made of corrosion-resistant materials to improve the durability of the equipment.

[0045] The sealing principle is as follows:

[0046] During leaching, the steel slag waste with reduced particle size enters the reaction tank I containing acetic acid solution, and the reaction temperature is increased by the heating coil to accelerate the dissolution rate; during carbonation, the pH of the leaching solution is adjusted by adding alkaline solution through the stop valve II, and inhibitors and shielding agents are added at the same time. Carbon dioxide is filled in through the carbon dioxide inlet assembly, carbonate is precipitated and sinks to the bottom of the reaction tank II, and is further processed to obtain the product after being collected by the liquid outlet valve II, thereby achieving the purpose of carbon dioxide sealing.

[0047] The working process is as follows:

[0048] 1. Extraction

[0049] Open the stop valve Ⅰ4 and close the first valve 6, first add a sufficient amount of acetic acid solution into the reaction tank Ⅰ through the stop valve Ⅰ, and then add the steel slag waste into the reaction tank Ⅰ1 through the feed port of the steel slag pretreatment unit; turn on the power 20 to heat the heating coil 5, and start the power stirring component Ⅰ at the same time to drive the stirrer to rotate, so that the reaction liquid in the reaction tank Ⅰ can react fully. After the reaction is completed, close the power stirring component Ⅰ and let the solution stand and settle.

[0050] 2. Carbonation

[0051] Open the stop valve II13 (during the carbonation reaction, the stop valve II can be normally open), the first valve 6 and the second valve 12, and close the air inlet valve 14 and the liquid outlet valve 15; use the booster pump 8 to extract the leachate with residual temperature in the reaction tank I1 to the reaction tank II9, and add an appropriate amount of potassium fluoride solution, an appropriate amount of triethanolamine solution, and a certain amount of NaOH solution to the reaction tank II9 through the stop valve II13 to adjust the pH of the leachate to 12-13; start the power stirring component II to drive the stirrer to rotate and stir the leachate; open the air inlet valve 14, and charge CO2 into the leachate through the carbon dioxide intake component to carry out a carbonation reaction (CO2 and Ca in the solution react with each other to form a carbonation reaction). 2+ Mg 2+ After the reaction is completed, the power stirring component II is turned off and the solution is allowed to settle.

[0052] 3. Post-processing

[0053] The liquid outlet valve 15 is opened to collect the precipitated mixed liquid, and the mixed liquid is filtered, dried, etc. to obtain a fine carbonate product.

[0054] The above is a cyclic process for completing carbon dioxide storage. Carbon dioxide storage can be achieved using steel slag by repeating the above process.

[0055] The above description is only a specific implementation mode of the present utility model, but the protection scope of the present utility model is not limited thereto. Any technician familiar with the technical field can easily think of various equivalent modifications or substitutions within the technical scope disclosed in the present utility model, and these modifications or substitutions should be included in the protection scope of the present utility model.

Claims

1. A carbon dioxide storage device, characterized in that: It includes a slag pretreatment unit, a leaching unit, a leaching liquid transportation unit and a carbonation unit; The steel slag pretreatment unit is used to crush the steel slag into 10-50 meshes and then transport it to the leaching unit; The leaching unit comprises a reaction tank I, a slag feed port, a stop valve I, a power stirring component I, a heating component and a liquid outlet valve I; The slag feed port and stop valve I are both arranged at the top of the reaction tank I, and are used to transport the slag into the reaction tank I and the acid solution for leaching the slag, respectively; The power stirring assembly I is arranged in the reaction tank I and is used to stir the reaction liquid formed by the steel slag and the acid solution; The heating component is arranged on the outer wall of the reaction tank I and is used to heat the reaction system in the reaction tank I; The liquid outlet valve I is arranged at the bottom of the reaction tank I, and is used to discharge the waste after the reaction of the steel slag and the acid solution; The leachate delivery unit is used to deliver the leachate generated by the reaction of steel slag and acid solution to the carbonation unit, and comprises a delivery pipeline and a first valve, a booster pump and a second valve sequentially arranged on the delivery pipeline along the leachate delivery direction; wherein the inlet of the delivery pipeline extends into the reaction system of the reaction tank I; The carbonation unit comprises a reaction tank II, a stop valve II, a carbon dioxide inlet assembly, a power stirring assembly II, and a liquid outlet valve II; The outlet of the delivery pipeline extends into the reaction tank II; The stop valve II is arranged at the top of the reaction tank II and is used to transport the inhibitor, shielding agent and pH regulator into the reaction tank II; The carbon dioxide intake assembly includes a carbon dioxide intake pipe and a carbon dioxide equalizer; the carbon dioxide intake pipe is installed on the side wall of the tank body of the reaction tank II, and an intake valve is arranged near the inlet thereof, and the outlet thereof is connected with the carbon dioxide equalizer; the carbon dioxide equalizer is horizontally arranged near the bottom of the reaction tank II, and the carbon dioxide equalizer includes a plurality of equalizer pipes; the plurality of equalizer pipes are evenly distributed radially with the outlet of the carbon dioxide intake pipe as the center, and each of the equalizer pipes is provided with a plurality of air outlet holes along the length direction; The power stirring assembly II is arranged in the reaction tank II and is located above the carbon dioxide distributor, and is used to stir the leaching liquid; The liquid outlet valve II is arranged at the bottom of the reaction tank II to collect carbonate precipitation; The bottoms of the reaction tanks I and II are both grooved, and support legs are arranged outside the bottoms of the reaction tanks I and II.

2. The carbon dioxide storage device according to claim 1, characterized in that: The steel slag pretreatment unit is a crusher, and its outlet is connected to the steel slag feed port of the reaction tank I.

3. The carbon dioxide storage device according to claim 1 or 2, characterized in that: The heating assembly includes a power supply and a heating coil; The heating coil is wound around the outer wall of the reaction tank I.

4. The carbon dioxide storage device according to claim 3, characterized in that: A filter screen is arranged at the inlet of the conveying pipeline.

5. The carbon dioxide storage device according to claim 4, characterized in that: The power stirring assembly I and the power stirring assembly II have the same structure, and both include a motor, a rotating shaft and a stirrer; the motor drives the rotating shaft to drive the stirrer to rotate.

6. The carbon dioxide storage device according to claim 5, characterized in that: The carbon dioxide equalizer includes 8 equalizer tubes.

7. The carbon dioxide storage device according to claim 6, characterized in that: The reaction tank I and the reaction tank II are both cylindrical tanks.

8. The carbon dioxide storage device according to claim 7, characterized in that: The acidic reagent is acetic acid, the inhibitor is potassium fluoride, the shielding agent is triethanolamine, and the pH regulator is sodium hydroxide.

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