A capture for capturing carbon dioxide

Abstract

The utility model discloses a kind of for capturing carbon dioxide's capturer, belong to industrial carbon dioxide capture device technical field, including spray tank, regeneration box and circulating tank, the spray tank, regeneration box and circulating tank are sequentially separated by support frame from top to bottom along vertical direction, and fixedly connected;Alcohol amine solution is stored in the spray tank, the spray tank side is connected with air inlet pipe, for passing into gas to be handled;Regeneration box side is connected with air outlet pipe, for collecting carbon dioxide gas;Heating assembly is provided in the regeneration box;The liquid outlet of the circulating tank is communicated with the liquid inlet of the spray tank, two heat exchange components are symmetrically arranged in the circulating tank, and water temperature sensor is arranged between two heat exchange components.The utility model solves the technical problem that the cooling capacity of the existing carbon dioxide capture device is insufficient, which can cause the absorption tower to capture efficiency to drop sharply or even fail.

Description

Technical Field

[0001] This utility model belongs to the technical field of industrial carbon dioxide capture devices, specifically relating to a capture device for capturing carbon dioxide. Background Technology

[0002] Alkylamine chemical absorption technology is one of the most mature and widely used post-combustion carbon capture technologies. Carbon capture devices, as its core components, have critical and urgent application needs in the following areas: 1) Fossil fuel power plants: This is the most important and largest-scale application scenario for carbon capture devices. Capturing carbon dioxide from flue gas generated by boilers or gas turbines in coal-fired or gas-fired power plants is a core technological path to achieve deep decarbonization in the power industry and address climate change; 2) Industrial process emission sources: Natural gas processing: In the desulfurization and decarbonization process, it is used to remove carbon dioxide from feed gas, improving natural gas quality; 3) Enhanced oil recovery (EOR): The captured carbon dioxide is compressed and transported to oil fields and injected underground to improve crude oil recovery, generating economic value while reducing emissions.

[0003] A complete and mature industrial carbon capture system using the amine process is a complex system, mainly composed of the following core equipment units: 1) Absorber: This is the core location for carbon dioxide capture. Low-temperature lean amine solution is sprayed down from the top of the tower and comes into countercurrent contact with the carbon dioxide-containing flue gas entering from the bottom of the tower, undergoing a chemical reaction to absorb the carbon dioxide into the liquid phase; 2) Regenerator / Stripper: This is the location for the desorption and regeneration of the rich amine solution (amine solution loaded with carbon dioxide). A heat source is provided by a reboiler to heat the solution to a high temperature of 120-150°C, breaking the chemical bond between the amine and carbon dioxide, and generating carbon dioxide gas and lean amine solution in the reverse reaction; 3) Heat exchanger system (heat carbon dioxide exchangers): This is the key to energy recovery and directly affects the economic efficiency of operation; 4) Fluid transport system: One type is pumps, including rich solution pumps (pressurizing the rich solution at the bottom of the absorber and sending it to the regenerator), lean solution pumps (sending the lean solution at the bottom of the regenerator back to the absorber), and various circulating pumps. One type is storage tanks and buffer tanks, used for amine liquid storage, preparation and system buffering.

[0004] Chinese patent CN210786780U discloses a carbon dioxide recovery device. By using an active and driven impeller to create turbulence, and a motor-driven screen vibration and heat exchanger to accelerate carbon dioxide evaporation, it solves the problems of low energy utilization and low absorption rate in existing devices, achieving more efficient carbon dioxide recovery. However, this device has insufficient cooling capacity, which can easily cause a sharp drop in the capture efficiency of the absorption tower, or even its failure. This is because the high-temperature lean solution directly enters the absorption tower, significantly increasing the operating temperature inside the tower. The absorption of carbon dioxide by amine solution is an exothermic reaction; low temperatures favor absorption, while high temperatures favor desorption. According to the principle of chemical equilibrium, a high-temperature environment will drive the reaction towards desorption. This will lead to the absorption tower being unable to effectively capture carbon dioxide in the flue gas, and may even cause the adsorbed carbon dioxide to be released back into the tower. If the carbon dioxide concentration in the outlet flue gas exceeds the standard, the entire carbon capture system will fail completely. Utility Model Content

[0005] In order to overcome the shortcomings of the prior art, the purpose of this utility model is to provide a capture device for capturing carbon dioxide, which solves the technical problem that the existing capture devices for capturing carbon dioxide have insufficient cooling capacity, which easily causes the capture efficiency of the absorption tower to drop sharply or even fail.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: This invention provides a carbon dioxide capture device, comprising a spray tank, a regeneration tank, and a circulation tank. The spray tank, regeneration tank, and circulation tank are arranged vertically from top to bottom and fixedly connected by a support frame. The spray tank stores an amine solution and has an inlet pipe connected to one side for introducing the gas to be treated. The regeneration tank has an outlet pipe connected to one side for collecting carbon dioxide gas. A heating component is provided in the regeneration tank. The outlet of the circulation tank is connected to the inlet of the spray tank. Two heat exchange components are symmetrically arranged inside the circulation tank, and a water temperature sensor is provided between the two heat exchange components.

[0007] Preferably, the heat exchange component is a cooling water drain.

[0008] Preferably, the top of the spray tank is equipped with a tank cover, and a liquid distribution seat is provided inside the tank cover, with a plurality of atomizers connected to the liquid distribution seat.

[0009] Preferably, a sealing ring is provided at the connection between the spray tank and the tank cover.

[0010] Preferably, a fixing seat is provided on the inner wall surface of the can lid, the output shaft of the motor is installed in the fixing seat, the motor is fixed inside the mounting seat, and the end of the mounting seat away from the fixing seat is connected to the atomizer.

[0011] Preferably, the heating assembly includes a heat-conducting plate and a heater. The heat-conducting plate is disposed on the bottom surface of the inner wall of the regeneration tank, and the heater is connected to the outside of the regeneration tank. The heat-conducting plate and the heater are electrically connected.

[0012] Preferably, a stirrer is installed at the top of the regeneration tank, and a stirring rod is connected to the bottom of the stirrer. The stirring rod extends into the interior of the regeneration tank, and a stirring blade is installed at the bottom of the stirring rod.

[0013] Preferably, the outlet of the circulation tank and the inlet of the spray tank are connected by a water pump.

[0014] Preferably, the support frame includes a first partition, with a column vertically connected to each of the four ends of the first partition, and a second partition is provided below the first partition.

[0015] Preferably, the spray tank and the regeneration tank are connected by a first connecting pipe, and the regeneration tank and the circulation tank are connected by a second connecting pipe.

[0016] Compared with the prior art, the present invention has the following beneficial effects: This invention provides a carbon dioxide capture device that directly enhances the system's heat exchange capacity by incorporating a circulation tank and symmetrically arranging two heat exchange components within it. The symmetrical design ensures uniform cooling, preventing localized overheating and maintaining the stability of the amine solution. This prevents carbon dioxide desorption or degradation due to temperature increases, ensuring consistent capture efficiency. A water temperature sensor positioned between the two heat exchange components monitors the absorbent temperature in real time, providing feedback to dynamically adjust the cooling intensity and ensuring the amine solution remains within its optimal operating temperature range. This fundamentally solves the efficiency reduction problem caused by insufficient cooling. The spray tank, regeneration tank, and circulation tank are arranged vertically in layers and fixedly connected by a support frame, reducing pipe length and heat loss. This also promotes gravity-driven fluid flow, lowering energy consumption and improving system response speed, indirectly supporting stable cooling efficiency.

[0017] Furthermore, the heat exchange components employ a cooling water sump, providing an efficient direct heat exchange method. The cooling water sump has a large surface area and good thermal conductivity, enabling it to quickly remove heat from the amine solution and directly enhance the cooling capacity of the circulating tank.

[0018] Furthermore, the absorbent is atomized and sprayed through atomizers and a distributor, allowing the amine solution to be simultaneously delivered to several atomizers. This increases the gas-liquid contact area and improves the carbon dioxide absorption rate. High-efficiency absorption reduces the residence time of the amine solution in the spray tank, thereby lowering the risk of temperature rise and alleviating cooling pressure. This synergistic effect is achieved with the enhanced cooling of the heat exchange components.

[0019] Furthermore, the sealing ring ensures the airtightness of the spray tank, preventing gas leakage and the intrusion of external hot air, reducing unnecessary heat input, helping to maintain a stable internal temperature of the trap, and indirectly supporting the reliability of the cooling effect.

[0020] Furthermore, the motor drives the atomizer to rotate, expanding the atomizer's spray range, further optimizing atomization uniformity and absorption efficiency. The rapid completion of the absorption process reduces heat accumulation in the amine solution, lowers the subsequent cooling load, and, in conjunction with the heat exchange components, helps improve the overall energy efficiency of the trap.

[0021] Furthermore, a heat-conducting plate and heater are used for regenerating the amine solution in the regeneration tank, thereby releasing carbon dioxide. Their electrical connection design enables precise temperature control, preventing overheating and degradation of the amine solution. The stable regeneration temperature reduces the formation of impurities in the circulating fluid, thus maintaining the cooling sensitivity of the amine solution and allowing the heat exchange components to cool the amine solution more efficiently.

[0022] Furthermore, the stirrer and impeller promote uniform heating and carbon dioxide release of the amine solution in the regeneration tank, preventing local overheating or uneven cooling, ensuring the temperature consistency of the amine solution after regeneration. When the amine solution returns to the circulation tank, it is more easily cooled uniformly by the heat exchange components, improving the stability of cooling efficiency.

[0023] Furthermore, the water pump ensures the forced circulation of the amine solution from the circulation tank to the spray tank, guaranteeing stable flow and rapid circulation. This prevents the amine solution from stagnating in high-temperature areas and promptly sends the hot amine solution back to the circulation tank for cooling, forming a closed-loop temperature management system. Working in conjunction with the heat exchange components, this significantly improves the cooling response speed and efficiency.

[0024] Furthermore, the first and second partitions provide robust layered support for the support frame, ensuring vertical alignment and compact layout of each tank, reducing heat loss and fluid resistance, and making the cooling process more efficient.

[0025] Furthermore, the first and second connecting pipes clearly define the fluid path, ensuring smooth flow of the absorbent liquid between the spray tank, regeneration tank, and circulation tank, reducing stagnation and heat accumulation, and enabling heat to be promptly removed by the heat exchange components in the circulation tank, directly enhancing the overall cooling capacity and reliability of the trap. Attached Figure Description

[0026] Figure 1 This is a structural diagram of the catcher of this utility model; Figure 2 This is a diagram showing the internal structure of the recycling box of this utility model; Figure 3 This is a diagram showing the internal structure of the spray tank of this utility model; Figure 4 This is a diagram showing the internal structure of the circulating tank of this utility model.

[0027] Wherein: 1-Support frame; 11-First partition; 12-Second partition; 2-Spray tank; 21-Sealing ring; 22-Air inlet pipe; 23-Tank cover; 24-Fixing base; 25-Motor; 26-Mounting base; 27-Atomizer; 28-Distribution pipe; 29-Distribution seat; 3-Regeneration box; 31-First connecting pipe; 32-Agitator; 33-Agitator rod; 34-Agitator blade; 35-Heat conduction plate; 36-Heater; 37-Air outlet pipe; 4-Circulation tank; 41-Second connecting pipe; 42-Cooling water drain; 43-Water temperature sensor; 44-Liquid suction head; 45-First delivery pipe; 46-Water pump; 47-Second delivery pipe. Detailed Implementation

[0028] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present invention.

[0029] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this utility model are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the utility model described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0030] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments: Example 1 like Figures 1 to 4As shown, this utility model provides a capture device for capturing carbon dioxide, including a support frame 1, a spray tank 2, a regeneration tank 3, and a circulation tank 4. The spray tank 2, the regeneration tank 3, and the circulation tank 4 are arranged vertically from top to bottom through the support frame 1 and are fixedly connected. Specifically, the support frame 1 includes a first partition 11, with a column vertically connected to each of the four ends of the first partition 11. A second partition 12 is arranged below the first partition 11. The spray tank 2 is installed above the first partition 11. The regeneration tank 3 is installed above the second partition 12. The circulation tank 4 is installed below the second partition 12. A second connecting pipe 41 is installed on the top of the circulation tank 4, and the second connecting pipe 41 extends upward into the interior of the regeneration tank 3; two heat exchange components 42 are symmetrically arranged inside the circulation tank 4, the heat exchange components 42 are cooling water ducts, and a water temperature sensor 43 is arranged between the two cooling water ducts; a liquid suction head 44 is arranged on one side of the circulation tank 4; a first delivery pipe 45 is connected to the outside of the circulation tank 4, one end of the first delivery pipe 45 is connected to the liquid suction head 44, and the other end is bolted to the liquid inlet of the water pump 46; a second delivery pipe 47 is connected to the liquid outlet of the water pump 46, and the end of the second delivery pipe 47 away from the water pump 46 is installed on the top of the spray tank 2.

[0031] More preferably, two parallel cooling water drains are arranged radially symmetrically along the central axis inside the circulating tank 4.

[0032] Further preferably, the top of the spray tank 2 is provided with an outlet for discharging the treated carbon dioxide exhaust gas.

[0033] Further preferably, the water temperature sensor carbon dioxide 43 is used to monitor the temperature of the lean solution after cooling in real time and transmit the signal to the control system so as to adjust the flow rate or temperature of the cooling water to ensure that the lean solution is always cooled to the optimal absorption temperature.

[0034] When the amine solution inside the regeneration tank 3 undergoes pyrolysis and releases carbon dioxide, it moves to the interior of the circulation tank 4 via the second connecting pipe 41. The temperature of the amine solution is then lowered by cooling water, and monitored by a water temperature sensor 43. Once the amine solution reaches room temperature, the water pump 46 is activated to transport it back to the spray tank 2 for spraying. The circulation tank 4 also includes a circulation device for the cooling water.

[0035] Example 2 like Figure 2 and Figure 3As shown in Comparative Embodiment 1, as another embodiment of this utility model, the top of the spray tank 2 is connected to a tank cover 23, and a sealing ring 21 is provided at the connection between the spray tank 2 and the tank cover 23. An air inlet pipe 22 is screwed to the side of the spray tank 2. A liquid distribution seat 29 is provided inside the tank cover 23, and four atomizers 27 are connected to the liquid distribution seat 29. Each atomizer 27 is connected to the liquid distribution seat 29 via a liquid distribution pipe 28. A fixing seat 24 is provided on the inner wall of the can lid 23. The output shaft of the motor 25 is installed inside the fixing seat 24. The motor 25 is mounted inside a mounting seat 26. The end of the mounting seat 26 away from the fixing seat 24 is connected to the atomizer 27. A dispensing seat 29 extends through to the top of the can lid 23 and is bolted to the second delivery pipe 47. The dispensing seat 29 has a hollow structure. Through the cooperation of the dispensing seat 29 and the dispensing pipe 28, the amine solution is simultaneously delivered to four atomizers 27, increasing the atomization area and improving the carbon dioxide adsorption efficiency.

[0036] Furthermore, a first connecting pipe 31 and two stirrers 32 are installed on the top of the regeneration tank 3. The two stirrers 32 are located on both sides of the first connecting pipe 31. A stirring rod 33 is installed at the bottom of the stirrer 32 and extends into the interior of the regeneration tank 3. A stirring blade 34 is installed at the bottom end of the stirring rod 33. A heat-conducting plate 35 is provided on the bottom surface of the inner wall of the regeneration tank 3. The heat-conducting plate 35 and the heater 36 connected to the outside of the regeneration tank 3 are electrically connected. An exhaust pipe 37 is installed on one side of the regeneration tank 3. The first connecting pipe 31 extends upward into the interior of the spray tank 2 for circulating the liquid in the spray tank 2 and the regeneration tank 3. Through the cooperation of the heater 36 and the heat-conducting plate 35, the solution inside the regeneration tank 3 is heated to the pyrolysis temperature, and the carbon dioxide adsorbed by the amine solution is separated out and then transported to the interior of the carbon dioxide storage device through the exhaust pipe 37.

[0037] How to use the capture device of this utility model: 1. Absorption process 1) Industrial waste gas that needs to capture carbon dioxide enters the bottom of the spray tank through the inlet pipe. 2) The amine solution, which has absorbed a large amount of carbon dioxide and has been regenerated from the circulating tank (carbon dioxide 4), is pumped by water pump (carbon dioxide 46) into the inlet at the top of the spray tank (carbon dioxide 2). The amine solution enters the distributor (carbon dioxide 29) and is evenly distributed to multiple atomizers (carbon dioxide 27). The motor (carbon dioxide 25) drives the atomizers (carbon dioxide 27) to rotate, spraying the amine solution downwards in the form of extremely fine droplets. 3) The exhaust gas flows from bottom to top, making full countercurrent contact with the alkanolamine solution droplets sprayed from top to bottom. At this time, the alkanolamine solution is at a low temperature and has a high carbon dioxide absorption capacity. The carbon dioxide in the exhaust gas reacts chemically with the alkanolamine solution and is captured. The alkanolamine solution that has captured carbon dioxide becomes a rich liquid and accumulates at the bottom of spray tank 2 under gravity; 4) The carbon dioxide concentration is significantly reduced after treatment, and the exhaust gas is discharged from the outlet set at the top of the spray tank 2.

[0038] 2. Rich solution transport and regeneration 1) The rich liquid that gathers at the bottom of the spray tank carbon dioxide 2 flows into the regeneration tank carbon dioxide 3 below through the first connecting pipe carbon dioxide 31. 2) The heater (carbon dioxide 36) starts up and heats the rich solution in the regeneration tank through the heat transfer plate (carbon dioxide 35), typically heating it to 80-120℃. The stirrer (carbon dioxide 32) drives the stirring blades (carbon dioxide 34) to rotate, ensuring uniform heating of the solution, preventing localized overheating and decomposition, and simultaneously promoting the precipitation of carbon dioxide gas from the liquid. 3) Under heating, the chemically bound carbon dioxide in the rich solution is desorbed and converted into high-purity carbon dioxide gas. The released carbon dioxide gas is collected through the outlet pipe 37 for subsequent compression, utilization, or storage. The alkanolamine solution after releasing carbon dioxide becomes lean solution again and remains at the bottom of regeneration tank 3.

[0039] 3. Lean solution cooling and circulation 1) The high-temperature lean solution regenerated in the carbon dioxide 3 regeneration tank flows into the lowest circulation tank carbon dioxide 4 through the second connecting pipe 41. 2) After the high-temperature lean liquor enters the circulation tank 4, it is immediately surrounded by two symmetrically arranged cooling water channels. The cooling water flows inside the cooling water channels, carrying away the heat from the lean liquor and rapidly cooling it from the high regeneration temperature to a suitable low temperature for absorption (usually 40-50℃). The carbon dioxide water temperature sensor 43 monitors the temperature of the lean liquor after cooling in real time and transmits the signal to the control system to adjust the flow rate or temperature of the cooling water, ensuring that the lean liquor is always cooled to the optimal absorption temperature; 3) The cooled lean liquid accumulates at the bottom of the circulation tank 4 and is pumped back to the inlet of the top spray tank 2 by the water pump carbon dioxide 46 to start the next capture cycle.

[0040] The above content is only for illustrating the technical concept of this utility model and should not be construed as limiting the scope of protection of this utility model. Any modifications made to the technical solution based on the technical concept proposed in this utility model shall fall within the scope of protection of the claims of this utility model.

Claims

1. A trap for capturing carbon dioxide, characterized in that, The system includes a spray tank (2), a regeneration tank (3), and a circulation tank (4). The spray tank (2), the regeneration tank (3), and the circulation tank (4) are arranged vertically from top to bottom and fixedly connected by a support frame (1). The spray tank (2) stores an alcohol amine solution. An air inlet pipe (22) is connected to one side of the spray tank (2) for introducing the gas to be treated. An air outlet pipe (37) is connected to one side of the regeneration tank (3) for collecting carbon dioxide gas. A heating component is provided in the regeneration tank (3). The outlet of the circulation tank (4) is connected to the inlet of the spray tank (2). Two heat exchange components (42) are symmetrically arranged inside the circulation tank (4), and a water temperature sensor (43) is provided between the two heat exchange components (42).

2. A carbon dioxide capture device according to claim 1, characterized in that, The heat exchange component (42) is a cooling water drain.

3. A carbon dioxide capture device according to claim 1, characterized in that, The spray tank (2) is equipped with a tank cover (23) on top, and a liquid distribution seat (29) is provided inside the tank cover (23). The liquid distribution seat (29) is connected to several atomizers (27).

4. A carbon dioxide capture device according to claim 3, characterized in that, A sealing ring (21) is provided at the connection between the spray tank (2) and the tank cover (23).

5. A carbon dioxide capture device according to claim 3, characterized in that, A fixing seat (24) is provided on the inner wall of the can lid (23). The output shaft of the motor (25) is installed in the fixing seat (24). The motor (25) is fixed inside the mounting seat (26). The end of the mounting seat (26) away from the fixing seat (24) is connected to the atomizer (27).

6. A carbon dioxide capture device according to claim 1, characterized in that, The heating assembly includes a heat-conducting plate (35) and a heater (36). The heat-conducting plate (35) is disposed on the bottom surface of the inner wall of the regeneration box (3), and the heater (36) is connected to the outside of the regeneration box (3). The heat-conducting plate (35) and the heater (36) are electrically connected.

7. A carbon dioxide capture device according to claim 1, characterized in that, A stirrer (32) is installed at the top of the regeneration tank (3), and a stirring rod (33) is connected to the bottom of the stirrer (32). The stirring rod (33) extends into the interior of the regeneration tank (3), and a stirring blade (34) is installed at the bottom of the stirring rod (33).

8. A carbon dioxide capture device according to claim 1, characterized in that, The outlet of the circulating tank (4) is connected to the inlet of the spray tank (2) via a water pump (46).

9. A carbon dioxide capture device according to claim 1, characterized in that, The support frame (1) includes a first partition (11), and a column is vertically connected to each of the four ends of the first partition (11). A second partition (12) is provided below the first partition (11).

10. A carbon dioxide capture device according to claim 1, characterized in that, The spray tank (2) is connected to the regeneration tank (3) through a first connecting pipe (31), and the regeneration tank (3) is connected to the circulation tank (4) through a second connecting pipe (41).

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