CO2 carbon sequestration device based on coal ash slurry injection

Abstract

The utility model provides a CO2 carbon sequestration device based on coal ash slurry injection. The CO2 carbon sequestration device comprises a CO2 inlet pipeline, a feeding device, a coal ash slurry tank, a stirring device, an injection device and a CO2 outlet, the feeding device is communicated with the fly ash slurry tank and is used for providing fly ash and water into the fly ash slurry tank; the stirring device is arranged in the fly ash slurry tank and is used for mixing and stirring the fly ash and the water into fly ash slurry; an opening is formed in the upper part of the coal ash slurry tank; the CO2 inlet pipeline and the CO2 outlet are communicated with the upper part of the coal ash slurry tank; and the spraying device is communicated with the coal ash slurry tank through a fluid conveying device so as to spray the coal ash slurry in the CO2 gas inlet pipeline and below the CO2 gas outlet.

Description

Technical Field

[0001] The utility model relates to the field of carbon sequestration and utilization devices, and specifically refers to a CO2 carbon fixation device based on injection of fly ash slurry. Background Art

[0002] Fly ash, as an industrial by-product produced in thermal power plants, has great potential for carbon sequestration. It contains a high proportion of alkaline oxides, such as calcium oxide (CaO), which can react chemically with CO2 to form stable carbonate minerals, achieving long-term fixation of CO2. This characteristic of fly ash, coupled with its abundant sources and low processing costs, makes it a strong candidate material for carbon sequestration. In addition, the use of fly ash can also help reduce the environmental impact of industrial solid waste and realize the resource utilization of waste. At present, the means of fly ash carbon sequestration mainly include wet carbonation, dry carbonation and direct liquid phase mineralization. Therefore, a carbon fixation device that can use fly ash to fix CO2 is needed.

[0003] CN116492828A provides a device for mineralizing and sealing carbon dioxide by fly ash, which fixes carbon by transporting a carbon dioxide absorption liquid into a reaction chamber for carbonization reaction and then separating. However, this method requires that the carbon dioxide gas be first absorbed into a liquid, which is complicated and costly. In the scheme of transporting the carbon dioxide gas to the reaction chamber alone, the contact area between the carbon dioxide gas and the fly ash is small, and the carbonization efficiency is low. Utility Model Content

[0004] The technical problem to be solved by the utility model is to provide a CO2 carbon fixation device based on the injection of fly ash slurry, which can realize the carbon sequestration of CO2 and has simple operation and low cost.

[0005] In order to solve the above technical problems, the utility model provides a CO2 carbon fixation device based on the injection of fly ash slurry, including a CO2 air inlet pipeline, a feeding device, a fly ash slurry tank, a stirring device, an injection device, and a CO2 air outlet;

[0006] The feeding device is connected to the fly ash slurry tank to provide fly ash and water into the fly ash slurry tank, and the stirring device is arranged inside the fly ash slurry tank to mix and stir the fly ash and water into fly ash slurry;

[0007] The fly ash slurry tank has an opening on the top, and the CO2 air inlet pipe and the CO2 air outlet are connected to the top of the fly ash slurry tank;

[0008] The injection device is connected to the fly ash slurry tank through a fluid conveying device to inject the fly ash slurry into the CO2 inlet pipeline and below the CO2 outlet.

[0009] In some embodiments, the feeding device includes a water tank and a fly ash raw material bin, the water tank transports water to the fly ash slurry tank through a water outlet pipe; the fly ash in the fly ash raw material bin is transported to the fly ash slurry tank through a conveyor belt.

[0010] In some of the embodiments, a liquid flow valve is also provided on the water outlet pipe.

[0011] In some embodiments, the injection device is divided into a first nozzle arranged at the CO2 inlet pipe and a second nozzle at the CO2 outlet, the first nozzle is connected to the outlet of the fluid conveying device through a first conveying pipe, and the second nozzle is connected to the outlet of the fluid conveying device through a second conveying pipe.

[0012] In some embodiments, a three-way diverter pipe is further included, wherein the inlet of the three-way diverter pipe is connected to the outlet of the fluid conveying device, and the first conveying pipe and the second conveying pipe are respectively connected to the two outlets of the three-way diverter pipe.

[0013] In some of the embodiments, a discharging mechanism is further included, and the discharging mechanism is connected to the fly ash slurry tank.

[0014] In some embodiments, the discharge mechanism includes a discharge pipe and a valve and a water discharge pump arranged on the discharge pipe.

[0015] In some of the embodiments, a blower is further included, and the blower blows CO2 gas into the CO2 intake pipe.

[0016] In some embodiments, the fly ash slurry tank is divided into a first part and a second part, the CO2 inlet pipe and the CO2 outlet are connected to the first part of the fly ash slurry tank, the feeding device is arranged above the second part, and the openings of the first part and the second part are isolated from each other and not connected.

[0017] In some embodiments, the fluid delivery device is a water outlet pump.

[0018] Compared with the prior art, the beneficial effects of the present invention include:

[0019] 1. The utility model adopts injection technology to evenly inject fly ash slurry into CO2 gas, significantly increasing the gas-liquid contact area and accelerating the absorption and mineralization reaction of CO2. This injection method ensures the uniformity of the carbonization reaction in the entire system, avoiding the problem of uneven reaction that may occur in traditional mixing equipment. At the same time, it strengthens the heat transfer and mass transfer process, further improving the carbonization reaction rate.

[0020] 2. The spraying device of the utility model sprays slurry to the CO2 inlet pipe and below the CO2 outlet, ensuring that the fly ash slurry can be sprayed evenly on the entire gas flow path. This layout not only improves the utilization rate of CO2, but also allows the gas to fully contact the fly ash slurry when entering and leaving the reaction zone, thereby maximizing the promotion of the mineralization reaction of CO2, allowing the fly ash slurry to form fine droplets in the gas flow, increasing the chance of contact with CO2, improving the reaction efficiency, and reducing energy consumption and operating costs.

[0021] 3. The utility model can not only effectively realize the storage of CO2, but also transform fly ash, an industrial waste, into a valuable resource. Through the wet mineralization process, the alkaline components in the fly ash react with CO2 to form stable carbonates, which not only reduces environmental pollution, but also provides a new application for fly ash. In addition, the treated fly ash can be used as building materials, soil conditioners, and even as a raw material for certain chemical products, greatly broadening its scope of application. The fly ash-based products at the discharge port can be customized according to demand and are suitable for a variety of different industrial and environmental engineering fields, demonstrating the high flexibility and market potential of the technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of the carbon fixation device of the utility model.

[0023] 1CO2 air inlet channel, 2 fly ash slurry tank, 2-1 the first part of the fly ash slurry tank, 2-2 the second part of the fly ash slurry tank, 11CO2 gas valve, 12 air inlet, 13 blower, 14CO2 air outlet, 21 water storage tank, 22 water outlet pipeline, 23 liquid flow valve, 24 fly ash raw material bin, 25 raw material conveyor belt, 31 motor, 32 spiral stirring blade, 33 fluid conveying device and valve, 34 three-way diversion pipeline, 35-1 first conveying pipeline, 35-2 second conveying pipeline, 36-1 first nozzle, 36-2 second nozzle, 41 valve and water outlet pump, 42 discharge port. DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model; it is obvious that the described embodiments are only part of the embodiments of the utility model, rather than all of the embodiments, and all other embodiments obtained by ordinary technicians in this field based on the embodiments of the utility model without making creative work are within the scope of protection of the utility model.

[0025] In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "top / bottom" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0026] In the description of the present utility model, it should be noted that, unless otherwise clearly stipulated and limited, the terms "installed", "provided with", "installed / connected", "connected", etc. should be understood in a broad sense. For example, "connection" can be a wall-mounted connection, a detachable connection, or an integral connection. It can be a mechanical connection or an electrical connection. It can be a direct connection or an indirect connection through an intermediate medium. It can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in the utility model can be understood according to specific circumstances.

[0027] This embodiment provides a CO2 carbon fixation device based on injection of fly ash slurry, including a CO2 air inlet pipeline 1, a feeding device, a fly ash slurry tank 2, a stirring device, an injection device, and a CO2 air outlet 14;

[0028] The fly ash slurry tank 2 is divided into a first part 2-1 and a second part 2-2, wherein the first part 2-1 and the second part 2-2 are open above, the CO2 air inlet pipe 1 and the CO2 air outlet 14 are connected to the top of the first part 2-1 of the fly ash slurry tank 2, the feeding device is arranged above the second part 2-2, and the openings of the first part 2-1 and the second part 2-2 are isolated from each other and not connected.

[0029] Specifically, the feeding device includes a water storage tank 21 and a fly ash raw material bin 24. The water storage tank 21 conveys water to the fly ash slurry tank 2 through a water outlet pipe 22. The fly ash in the fly ash raw material bin 24 is conveyed to the fly ash slurry tank 2 through a raw material conveyor belt 25. The stirring device includes a spiral stirring blade 32 and a motor 31 for driving the spiral stirring blade 32. The spiral stirring blade 32 is arranged inside the fly ash slurry tank 2 to mix and stir the fly ash and water into fly ash slurry.

[0030] The injection device is connected to the fly ash slurry tank 2 through a fluid conveying device 33 to spray the fly ash slurry in the CO2 inlet pipe 1 and below the CO2 outlet 14. Specifically, the injection device is divided into a first nozzle 36-1 arranged at the CO2 inlet pipe 1 and a second nozzle 36-2 at the CO2 outlet, and also includes a three-way diverter pipe 34, the inlet of the three-way diverter pipe 34 is connected to the discharge port of the fluid conveying device 33, and the two outlets of the three-way diverter pipe 33 are respectively connected to the first conveying pipe 35-1 and the second conveying pipe 35-2, the first conveying pipe 35-1 is connected to the first nozzle 36-1, and the second conveying pipe 35-2 is connected to the second nozzle 36-2. The slurry in the fly ash slurry tank 2 is transported to the first nozzle 36-1 and the second nozzle 36-2 through the fluid conveying device 33 for injection. Among them, the fluid conveying device 33 is a water outlet pump.

[0031] Open the CO2 gas valve 11, and the CO2 gas is blown into the CO2 inlet pipe 1 from the air inlet 12 through the blower 13 to fill the entire carbon fixation device. A part of the CO2 gas undergoes carbonization reaction with the fly ash slurry in the CO2 inlet pipe and then falls into the first part 2-1 of the fly ash slurry tank with the slurry. Another part undergoes carbonization reaction with the fly ash slurry on the surface of the fly ash slurry tank 2. The remaining part undergoes carbonization reaction with the fly ash slurry sprayed from the bottom of the CO2 outlet 14, and the unreacted part is discharged from the CO2 outlet.

[0032] In order to discharge the fly ash slurry after the reaction from the fly ash slurry tank, a discharging mechanism is also included, which includes a discharging pipe and a valve and a water outlet pump 41 arranged on the discharging pipe. The inlet of the discharging pipe is connected to the fly ash slurry tank 2. By opening the valve and the water outlet pump 41, the fly ash slurry after the reaction can be discharged from the outlet 42 of the discharging pipe for other uses.

[0033] In order to achieve accurate control of the slurry flow and ensure accurate proportioning and supply of fly ash slurry, in this embodiment, a liquid flow valve 23 is further provided on the outlet pipe 22. The concentration of the slurry can be controlled by adjusting the liquid flow valve 23, ensuring that the fly ash slurry at the bottom of the fly ash slurry tank is connected in liquid and solid phases, thereby preventing CO2 gas from overflowing from the second part 2-2.

[0034] The specific implementation methods are as follows:

[0035] S1 feeding stage:

[0036] First, fly ash A is located in fly ash raw material bin 24, and falls from fly ash raw material bin 24 to raw material conveyor belt 25, water B enters from water storage tank 21, liquid flow valve 23 is opened, and water B in water storage tank 21 flows into second part 2-2 of fly ash slurry tank through liquid flow valve 23 and outlet pipe 22. When the first part 2-1 and the lower part 2-2 of fly ash slurry tank are connected by slurry liquid-solid phase, the addition of raw materials is stopped.

[0037] Then, the motor 31 is started, and the slag A and the water B are uniformly stirred by the stirring shaft and the spiral stirring blades 32 to form a fly ash slurry that can be used for pumping and nozzle injection.

[0038] S2 carbonization reaction process:

[0039] First, open the fluid conveying device 33 and the valve, so that the fly ash slurry flows into the first conveying pipeline 35-1 and the second conveying pipeline 35-2 respectively through the three-way diversion pipeline 34, and then is sprayed to the air inlet in the CO2 air inlet pipeline and the CO2 air outlet 14 respectively through the first nozzle 36-1 and the second nozzle 36-2. The fly ash slurry is transported, sprayed, reacts with CO2 gas, and then flows into the first part 2-1 of the fly ash slurry tank. In the process of circulating injection of the fly ash slurry, the lower parts of the first part 2-1 and the second part 2-2 of the fly ash slurry tank are still connected by the slurry liquid-solid phase to prevent CO2 gas from escaping from the second part 2-2 of the fly ash slurry tank.

[0040] At the same time, the CO2 gas valve 11 is opened, and the CO2 gas enters the CO2 intake pipe 1 through the blower 12, and a part of the gas reacts with the fly ash slurry sprayed by the first nozzle 36-1 in the CO2 intake pipe 1. The fly ash slurry fully contacted with CO2 flows from the CO2 intake pipe 1 into the first part 2-1 of the fly ash slurry tank.

[0041] After the CO2 gas passes through the CO2 inlet pipe 1, a portion of the CO2 gas contacts the slurry liquid surface on the first part 2-1, and the remaining portion of the CO2 gas rises below the gas outlet 14 and undergoes a carbonization reaction with the fly ash slurry sprayed by the second nozzle 36-2 below the gas outlet, and the carbonized fly ash slurry flows into the first part 2-1 of the fly ash slurry tank. The unreacted CO2 is discharged from the gas outlet 14 and then recycled by other measures.

[0042] The fly ash slurry sprayed from the first nozzle 36-1 and the second nozzle 36-2 in the CO2 inlet pipe 1 and below the CO2 outlet 14 flows into the first part 2-1 of the fly ash slurry tank from the CO2 inlet pipe 1 and below the inlet, and reacts more fully with CO2 under the stirring of the spiral stirring blades 32 to generate carbonate products such as calcium carbonate.

[0043] Unloading process:

[0044] After the fly ash slurry has been fully circulated for a specified time, the fly ash slurry will be fully in contact with CO2 to undergo a carbonization reaction. Then close the CO2 inlet valve 11 to stop ventilation, turn off the motor 31 to stop stirring, close the fluid conveying device 33 and the valve, stop the circulation and injection of the fly ash slurry, and finally perform the unloading process. The specified time refers to the time during which the fly ash slurry fully absorbs CO2 to undergo a carbonization reaction, which can be obtained from actual working condition tests. Open the valve and the water outlet pump 41 to perform the unloading process, and the fly ash slurry after the carbonization reaction is discharged from the discharge port 42.

[0045] In a specific implementation manner, the carbonization reaction of CO2 gas and fly ash slurry mainly has three stages, namely:

[0046] (1) In the CO2 intake pipe 1, CO2 reacts with the fly ash slurry injected from the first intake nozzle 36-1 to undergo carbonization reaction.

[0047] (2) The CO2 gas filled in the carbon fixation device contacts the slurry liquid surface on the first part 2-1 to cause a carbonization reaction.

[0048] (3) CO2 reacts with the fly ash slurry injected by the second nozzle 36-2 to undergo carbonization reaction below the CO2 outlet 14. The injected fly ash slurry absorbs CO2 and flows into the fly ash slurry tank 2. The slurry reacts with CO2 to undergo a more complete carbonization reaction under the action of the stirring shaft.

[0049] The above is only a preferred specific implementation method of the utility model, but the design concept of the utility model is not limited to this. Any technician familiar with the technical field who uses this concept to make non-substantial changes to the utility model within the technical scope disclosed by the utility model shall be deemed to infringe the protection scope of the utility model.

Claims

1. A CO2 carbon fixation device based on injection of fly ash slurry, characterized in that: It includes a CO2 inlet pipeline, a feeding device, a fly ash slurry tank, a stirring device, an injection device, and a CO2 outlet; The feeding device is connected to the fly ash slurry tank to provide fly ash and water into the fly ash slurry tank, and the stirring device is arranged inside the fly ash slurry tank to mix and stir the fly ash and water into fly ash slurry; The fly ash slurry tank has an opening on the top, and the CO2 air inlet pipe and the CO2 air outlet are connected to the top of the fly ash slurry tank; The injection device is connected to the fly ash slurry tank through a fluid conveying device to inject the fly ash slurry into the CO2 inlet pipeline and below the CO2 outlet.

2. The CO2 carbon fixation device based on injection of fly ash slurry according to claim 1 is characterized in that: The feeding device comprises a water storage tank and a fly ash raw material bin. The water storage tank conveys water to the fly ash slurry tank through a water outlet pipe; the fly ash in the fly ash raw material bin is conveyed to the fly ash slurry tank through a conveyor belt.

3. The CO2 carbon fixation device based on injection of fly ash slurry according to claim 2 is characterized in that: The water outlet pipe is also provided with a liquid flow valve.

4. The CO2 carbon fixation device based on injection of fly ash slurry according to claim 1 is characterized in that: The injection device is divided into a first nozzle arranged at the CO2 inlet pipe and a second nozzle at the CO2 outlet. The first nozzle is connected to the discharge port of the fluid conveying device through a first conveying pipe, and the second nozzle is connected to the discharge port of the fluid conveying device through a second conveying pipe.

5. The CO2 carbon fixation device based on injection of fly ash slurry according to claim 4 is characterized in that: It also includes a three-way diverter pipe, the inlet of the three-way diverter pipe is connected to the discharge port of the fluid conveying device, and the first conveying pipe and the second conveying pipe are respectively connected to the two outlets of the three-way diverter pipe.

6. The CO2 carbon fixation device based on injection of fly ash slurry according to claim 1 is characterized in that: It also includes a discharging mechanism, which is connected to the fly ash slurry tank.

7. The CO2 carbon fixation device based on injection of fly ash slurry according to claim 6 is characterized in that: The discharging mechanism comprises a discharging pipeline and a valve and a water discharge pump arranged on the discharging pipeline.

8. The CO2 carbon fixation device based on injection of fly ash slurry according to claim 1 is characterized in that: It also includes a blower, which blows CO2 gas into the CO2 intake pipe.

9. The CO2 carbon fixation device based on injection of fly ash slurry according to claim 1, characterized in that: The fly ash slurry tank is divided into a first part and a second part. The CO2 inlet pipe and the CO2 outlet are connected to the first part of the fly ash slurry tank. The feeding device is arranged above the second part. The openings of the first part and the second part are isolated from each other and are not connected.

10. The CO2 carbon fixation device based on injection of fly ash slurry according to any one of claims 1 to 9, characterized in that: The fluid conveying device is a water outlet pump.

Images