Experimental device and method for mineralizing and sealing carbon dioxide by using pulverized coal ash slurry

Abstract

The invention discloses an experimental device and method for mineralizing and sealing carbon dioxide by using fly ash slurry, and relates to the technical field of environmental protection, the experimental device comprises a carbon dioxide gas cylinder, an air separation layer and a reaction kettle, the carbon dioxide gas cylinder is connected with the air separation layer through a pipeline, and carbon dioxide gas in the carbon dioxide gas cylinder enters the air separation layer through a pipeline; the carbon dioxide gas enters the reaction kettle through the spacing layer to react with the coal ash slurry; a constant pressure valve and a gas flow meter are arranged on the pipeline; a rotating shaft with blades in the reaction kettle is driven by a motor to operate; and the ultrasonic device, the pressure gauge and the gas concentration test meter are positioned above the reaction kettle. The invention provides a low-cost carbon dioxide mineralization method, the method has general applicability and is very convenient to operate, the reaction efficiency is further improved by innovative steps such as ultrasonic device and blade operation, and a new technical approach is provided for resource utilization of fly ash and carbon dioxide emission reduction measures.

Description

Technical Field

[0001] The invention relates to the technical field of environmental protection, and in particular to an experimental device and method for mineralizing and sealing carbon dioxide using coal pulverized ash slurry. Background Art

[0002] As the global climate change problem becomes increasingly prominent, reducing carbon dioxide emissions has become an important issue that all countries need to solve urgently. Carbon capture and storage technology is one of the key means to address climate change. Among the many CCS technologies, the technology of using fly ash to absorb carbon dioxide shows unique advantages. As an industrial waste, fly ash is rich in elements such as silicates and aluminates, and has great potential for storing carbon dioxide. The slurry formed by mixing fly ash and water to solidify carbon dioxide during the mineralization process has become a potential way to reduce carbon dioxide emissions. It can not only reduce the concentration of carbon dioxide in the environment, but also increase the added value of fly ash and realize the recycling of resources.

[0003] The existing experimental devices and methods for mineralization and storage of carbon dioxide have the problem of low carbon dioxide storage efficiency (CN117899644A) and high cost during implementation (CN117401913A). Under this background, it is particularly important to invent an experimental device and method for mineralization and storage of carbon dioxide using fly ash slurry. Summary of the invention

[0004] The purpose of the present invention is to provide an experimental device and method for mineralizing and storing carbon dioxide using coal ash slurry, so as to solve the problems existing in the above-mentioned prior art and provide a new way for fly ash utilization and carbon dioxide fixation.

[0005] To achieve the above-mentioned purpose, the present invention provides the following scheme: The present invention provides an experimental device for mineralizing and sealing carbon dioxide by fly ash slurry, comprising a carbon dioxide cylinder and a reactor, wherein the reactor is used to contain fly ash slurry, the carbon dioxide cylinder is connected to an air barrier through a pipeline, and the carbon dioxide gas enters the reactor through the air barrier to react with the fly ash slurry, a constant pressure valve and a gas flow meter are arranged on the pipeline; a pressure gauge and a gas concentration test gauge are arranged above the reactor.

[0006] Preferably, the insulating layer adopts a semi-cylindrical structure, the lower outer side of the reactor is covered with the insulating layer, and a plurality of pores are evenly opened on the lower outer side of the reactor, and the carbon dioxide gas in the insulating layer enters the reactor through the pores.

[0007] Preferably, a rotating shaft with spiral blades is provided in the reactor, and a motor drives the rotating shaft to rotate.

[0008] Preferably, the reactor is equipped with a feed inlet, a discharge port and a pressure relief valve.

[0009] Preferably, the reactor is also provided with an ultrasonic device.

[0010] The present invention also provides an experimental method for mineralizing and storing carbon dioxide using fly ash slurry, which is applied to the above-mentioned experimental device for mineralizing and storing carbon dioxide using fly ash slurry, and comprises the following steps:

[0011] Step 1: Add fly ash and water into the reactor through the feed port of the reactor, record the volume of slurry added, and record the value of the initial carbon dioxide gas concentration test table through the gas concentration test table on the reactor;

[0012] Step 2: Calculate the initial carbon dioxide gas mass M1 in the reactor according to the reactor volume, the fly ash slurry volume and the value in the initial carbon dioxide gas concentration test table;

[0013] Step 3: Close the feed port of the reactor, open the constant pressure valve, allow the carbon dioxide gas in the carbon dioxide cylinder to enter the air barrier through the pipeline, and then enter the reactor through the air barrier again. Record the opening time and pressure value of the constant pressure valve, and record the gas flow meter value.

[0014] Step 4: By observing the pressure gauge, when the value of the pressure gauge reaches the preset range, close the constant pressure valve, record the closing time of the constant pressure valve, the pressure value of the constant pressure valve, and the gas flow meter value, turn on the ultrasonic device to accelerate the mineralization reaction of the fully fused fly ash slurry and carbon dioxide gas;

[0015] Step 5: Observe the pressure gauge. When the pressure gauge value reaches the preset range, turn off the ultrasonic device. Before discharging the remaining gas, calculate the mass M2 of carbon dioxide gas in the reactor at the end state according to the pressure gauge value on the reactor, the volume of the reactor and the value of the gas concentration test table;

[0016] Step 6: Calculate the output mass M3 of carbon dioxide gas according to the pressure value on the constant pressure valve, the opening time of the constant pressure valve and the three values ​​of the gas flow meter;

[0017] Step 7: Calculate the mass of carbon dioxide gas M (M=M3-M2+M1) participating in the mineralization reaction by using the initial mass of carbon dioxide gas M1, the mass of carbon dioxide gas in the reactor at the end state M2 and the mass of carbon dioxide gas output M3; calculate the carbon fixation amount of the fly ash carbon fixation slurry by using the mass of carbon dioxide gas participating in the mineralization reaction and the mass of fly ash slurry;

[0018] Step 8: Open the pressure relief valve to allow the remaining carbon dioxide gas that meets the standards to be discharged from the reactor;

[0019] Step 9: Open the discharge port of the reactor to discharge the mineralized fly ash slurry.

[0020] Compared with the prior art, the present invention has achieved the following beneficial technical effects:

[0021] The experimental device and method for mineralizing and sealing carbon dioxide using fly ash slurry of the present invention include a carbon dioxide cylinder, an air barrier and a reactor. The carbon dioxide cylinder is connected to the air barrier through a pipeline, and the carbon dioxide in the carbon dioxide cylinder enters the air barrier through the pipeline, and the carbon dioxide enters the reactor through the air barrier to react with the fly ash slurry; a constant pressure valve and a gas flow meter are provided on the pipeline; a rotating shaft with blades in the reactor is driven by a motor to operate; an ultrasonic device, a pressure gauge and a gas concentration tester are located above the reactor; the reactor is equipped with a feed port, a discharge port and a pressure relief valve. The present invention provides a low-cost carbon dioxide mineralization method, which has universal applicability and is very convenient in operation. Innovative steps such as ultrasonic devices and blade operation further improve the reaction efficiency, and provide a new technical approach for the resource utilization of fly ash and carbon dioxide emission reduction measures. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 It is a schematic diagram of the cross-sectional structure of an experimental device for mineralizing and storing carbon dioxide using fly ash slurry;

[0024] Figure 2 A schematic diagram of the partial structure of an experimental device for mineralizing and storing carbon dioxide using fly ash slurry;

[0025] Among them, 1. Carbon dioxide cylinder; 2. Pipeline; 3. Gas flow meter; 4. Constant pressure valve; 5. Air barrier; 6. Reactor; 7. Motor; 8. Blade; 9. Ultrasonic device; 10. Pressure gauge; 11. Gas concentration test meter; 12. Feed inlet; 13. Discharge outlet; 14. Pressure relief valve. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] The purpose of the present invention is to provide an experimental device and method for mineralizing and storing carbon dioxide using coal ash slurry, so as to solve the problems existing in the above-mentioned prior art and provide a new way for fly ash utilization and carbon dioxide fixation.

[0028] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0029] like Figure 1-Figure 2 As shown, the present invention provides an experimental device and method for mineralizing and sealing carbon dioxide using fly ash slurry, comprising a carbon dioxide cylinder 1 connected to an air barrier 5 through a pipeline 2, the carbon dioxide in the carbon dioxide cylinder 1 enters the air barrier 5 through the pipeline 2, and enters the reactor 6 through the air barrier 5 to react with the fly ash slurry; a constant pressure valve 4 and a gas flow meter 3 are arranged on the pipeline 2, a motor 7 is arranged on the outside of the reactor 6, the motor 7 drives a rotating shaft with blades 8 in the reactor 6 to stir the fly ash slurry evenly, an ultrasonic device 9, a pressure gauge 10 and a gas concentration tester 11 are installed above the reactor 6, and the reactor 6 is equipped with a feed port 12, a discharge port 13 and a pressure relief valve 14.

[0030] The insulating layer 5 adopts a semi-cylindrical structure, and the lower side of the reactor 6 is covered with the insulating layer 5. A plurality of pores are evenly opened on the lower side of the reactor 6, and the carbon dioxide gas in the insulating layer 5 enters the reactor 6 through the pores. The thickness of the insulating layer 5 is relatively small, and the bottom of the insulating layer 5 is connected to the supporting legs to support the entire reactor 6 on the ground, so as to facilitate the entry of gas from the bottom.

[0031] The present invention proposes an experimental device and method for mineralizing and storing carbon dioxide using fly ash slurry, the steps of which include:

[0032] S1. Add a certain proportion of fly ash and water into the reactor 6 through the feed port 12, record the volume of the slurry added, start the motor 7 to drive the blade 8, stir the material evenly, and record the value of the initial carbon dioxide gas concentration test table 11;

[0033] S2, calculating the initial carbon dioxide gas mass M1 in the reactor 6 according to the volume of the reactor 6, the volume of the slurry and the value of the initial carbon dioxide gas concentration test table;

[0034] S3, close the feed port 12, open the constant pressure valve 4, and allow the carbon dioxide gas in the carbon dioxide cylinder 1 to enter the air barrier 5 through the pipeline 2, and the carbon dioxide gas enters the reactor 6 through the air barrier 5 again, and record the opening time, pressure value, and gas flow meter value of the constant pressure valve 4, wherein the air barrier 5 allows the carbon dioxide gas to pass through the air barrier 5 and enter the reactor 6, but the fly ash slurry cannot pass through the air barrier 5;

[0035] S4, by observing the pressure gauge 10, when the value of the pressure gauge 10 reaches the preset range, close the constant pressure valve 4, record the closing time, the pressure value of the constant pressure valve 4, and the value of the gas flow meter 3; the motor 7 drives the blades 8 in the reactor 6 to fully mix the fly ash slurry with the carbon dioxide gas, accelerate the reaction of the fly ash slurry with the carbon dioxide, turn on the ultrasonic device 9, so that the fully fused fly ash slurry is again reacted with the carbon dioxide gas to accelerate the mineralization reaction;

[0036] S5, observe the pressure gauge 10, when the value of the pressure gauge 10 reaches the preset range, turn off the ultrasonic device 9, and calculate the mass M2 of the carbon dioxide gas in the reactor at the end state according to the value of the gas pressure gauge on the reactor 6, the volume of the reactor 6 and the value of the carbon dioxide gas concentration test table 11 before discharging the remaining gas;

[0037] S6, calculating the output mass M3 of carbon dioxide gas according to the pressure value on the constant pressure valve 4, the opening time of the constant pressure valve 4 and the gas flow meter;

[0038] S7, using the initial carbon dioxide gas mass M1, the carbon dioxide gas mass M2 in the reactor at the end state and the carbon dioxide gas output mass M3, calculate the carbon dioxide gas mass M (M = M3-M2+M1) involved in the mineralization reaction, and calculate the carbon fixation amount of the fly ash carbon fixation slurry from the carbon dioxide gas mass involved in the mineralization reaction and the fly ash slurry mass;

[0039] S8, opening the pressure relief valve 14, so that the remaining carbon dioxide gas that meets the standards is discharged from the reactor 6;

[0040] S9, open the discharge port 13 to discharge the mineralized fly ash slurry. When all the fly ash slurry is discharged, turn off the motor 7 and stop driving the blades 8. The discharge port 13 is connected to the reactor 6 but not to the airtight layer 5.

[0041] The experimental device and method for sealing carbon dioxide using fly ash slurry in the present invention are as follows: first, fly ash and water are added to a reactor, and a motor drives blades to stir to form fly ash slurry. Then, the gas in the carbon dioxide cylinder enters the air barrier through a constant pressure valve in a constant pressure state, thereby entering the reactor to react with the fly ash slurry. The opening time of the constant pressure valve, the pressure value, the gas flow meter value, and the concentration value are recorded to calculate the mass of the carbon dioxide introduced. The blades rotate to accelerate the reaction, and the ultrasonic device is turned on to accelerate the reaction again. When the pressure gauge observes that the value in the reactor reaches a preset range, indicating that the reaction is completed, the ultrasonic device is turned off, and the mass of the remaining unreacted carbon dioxide gas is calculated before discharging the remaining gas. Then, the pressure relief valve is opened to discharge the remaining carbon dioxide that meets the standard, and the discharge port is opened to discharge the reaction material. While mineralizing and sealing the carbon dioxide, the carbon fixation amount of the fly ash carbon fixation slurry can also be calculated.

[0042] It should be noted that it is obvious to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiments, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present invention, and any figure mark in the claims should not be regarded as limiting the claims involved.

[0043] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the method and core ideas of the present invention. At the same time, for those skilled in the art, according to the ideas of the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. An experimental device for mineralizing and storing carbon dioxide using fly ash slurry, characterized in that: It comprises a carbon dioxide gas cylinder and a reactor, wherein the reactor is used to contain fly ash slurry, the carbon dioxide gas cylinder is connected to an airtight layer through a pipeline, and the carbon dioxide gas enters the reactor through the airtight layer to react with the fly ash slurry, a constant pressure valve and a gas flow meter are arranged on the pipeline; a pressure gauge and a gas concentration test gauge are arranged above the reactor.

2. The experimental device for mineralizing and storing carbon dioxide using fly ash slurry according to claim 1 is characterized in that: The isolation layer adopts a semi-cylindrical structure, and the lower side of the reactor is covered with the isolation layer. The lower side of the reactor is evenly provided with a plurality of pores, and the carbon dioxide gas in the isolation layer enters the reactor through the pores.

3. The experimental device for mineralizing and storing carbon dioxide using fly ash slurry according to claim 1 is characterized in that: A rotating shaft with spiral blades is arranged in the reactor, and a motor drives the rotating shaft to rotate.

4. The experimental device for mineralizing and storing carbon dioxide using fly ash slurry according to claim 1 is characterized in that: The reactor is equipped with a feed inlet, a discharge port and a pressure relief valve.

5. The experimental device for mineralizing and storing carbon dioxide using fly ash slurry according to claim 1 is characterized in that: The reactor is also provided with an ultrasonic device.

6. An experimental method for mineralizing and storing carbon dioxide using fly ash slurry, applied to the experimental device for mineralizing and storing carbon dioxide using fly ash slurry as described in any one of claim 5, characterized in that: The following steps are involved: Step 1: Add fly ash and water into the reactor through the feed port of the reactor, record the volume of slurry added, and record the value of the initial carbon dioxide gas concentration test table through the gas concentration test table on the reactor; Step 2: Calculate the initial carbon dioxide gas mass M1 in the reactor according to the reactor volume, the fly ash slurry volume and the value in the initial carbon dioxide gas concentration test table; Step 3: Close the feed port of the reactor, open the constant pressure valve, allow the carbon dioxide gas in the carbon dioxide cylinder to enter the air barrier through the pipeline, and then enter the reactor through the air barrier again. Record the opening time and pressure value of the constant pressure valve, and record the gas flow meter value. Step 4: By observing the pressure gauge, when the value of the pressure gauge reaches the preset range, close the constant pressure valve, record the closing time of the constant pressure valve, the pressure value of the constant pressure valve and the gas flow meter value, turn on the ultrasonic device to accelerate the mineralization reaction of the fully fused fly ash slurry and carbon dioxide gas; Step 5: Observe the pressure gauge. When the pressure gauge value reaches the preset range, turn off the ultrasonic device. Before discharging the remaining gas, calculate the mass M2 of carbon dioxide gas in the reactor at the end state according to the pressure gauge value on the reactor, the volume of the reactor and the value of the gas concentration test table; Step 6: Calculate the output mass M3 of carbon dioxide gas according to the pressure value on the constant pressure valve, the opening time of the constant pressure valve and the three values ​​of the gas flow meter; Step 7: Calculate the mass of carbon dioxide gas M (M=M3-M2+M1) participating in the mineralization reaction by using the initial mass of carbon dioxide gas M1, the mass of carbon dioxide gas in the reactor at the end state M2 and the mass of carbon dioxide gas output M3; calculate the carbon fixation amount of the fly ash carbon fixation slurry by using the mass of carbon dioxide gas participating in the mineralization reaction and the mass of fly ash slurry; Step 8: Open the pressure relief valve to allow the remaining carbon dioxide gas that meets the standards to be discharged from the reactor; Step 9: Open the discharge port of the reactor to discharge the mineralized fly ash slurry.

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