Carbon capture membrane system for flue gas treatment
By using a multi-stage filtration and absorbent circulation design in the carbon capture membrane system, the problem of low capture efficiency of high-concentration carbon dioxide in existing flue gas treatment methods has been solved, achieving efficient, stable, and economical flue gas treatment and generating economic benefits.
Patent Information
- Application Number
- CN202423121698.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-17
- Publication Date
- 2025-11-07
- Estimated Expiration
- 2034-12-17
AI Technical Summary
Existing flue gas treatment methods are difficult to achieve efficient and stable carbon capture when treating high-concentration carbon dioxide flue gas, and they also suffer from problems such as complex equipment, high operating costs, difficult maintenance, and secondary pollution.
A carbon capture membrane system is adopted, including a blower, a gas filtration device, and an absorbent circulation device. It utilizes a carbon dioxide separation membrane and alkaline solution circulation, and achieves efficient carbon dioxide capture and stable supply of absorbent through a closed-loop circulation design of multi-stage filtration boxes and storage tanks.
It improves flue gas treatment efficiency and carbon dioxide capture rate, reduces operating costs, simplifies system structure, enhances system stability and maintenance convenience, and realizes the resource utilization of sodium carbonate.
Smart Images
Figure CN223517260U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of waste gas treatment equipment, and more particularly to a carbon capture membrane system for flue gas treatment. Background Technology
[0002] Flue gas treatment is a crucial issue in environmental protection, especially given the large amounts of carbon dioxide-containing flue gas generated during industrial production. With increasing environmental awareness, effectively treating these flue gases and reducing greenhouse gas emissions has become a priority. Traditional flue gas treatment methods mainly focus on physical adsorption and chemical absorption. While these methods can reduce the carbon dioxide concentration in flue gas to some extent, they still have many shortcomings in practical applications.
[0003] Currently, common flue gas treatment methods mainly include wet desulfurization, dry desulfurization, and chemical absorption. Wet desulfurization typically uses limestone slurry as an absorbent, which is sprayed onto the flue gas to remove sulfur dioxide. Dry desulfurization involves spraying powdered absorbent onto the flue gas as it passes through a reaction tower to adsorb harmful gases. Chemical absorption methods often use alkaline solutions (such as sodium hydroxide solution) as the absorbent, which is pumped into the absorption tower by a circulating pump to ensure full contact with the flue gas and capture carbon dioxide.
[0004] However, existing flue gas treatment methods generally suffer from problems such as complex equipment, high operating costs, and difficult maintenance. Especially when treating high-concentration carbon dioxide flue gas, traditional methods often fail to achieve efficient and stable carbon capture, and are prone to causing secondary pollution. Therefore, developing a flue gas treatment system that is simple in structure, stable in operation, and low in cost has become an urgent technical challenge. Utility Model Content
[0005] In order to achieve carbon neutrality and turn waste into treasure, this application provides a carbon capture membrane system for flue gas treatment.
[0006] The carbon capture membrane system for flue gas treatment provided in this application adopts the following technical solution:
[0007] A carbon capture membrane system for flue gas treatment includes a blower, a gas filtration device, and an absorbent circulation device;
[0008] The gas filtration device includes a filter box and a carbon dioxide separation membrane; the filter box is connected to the blower via a pipe to deliver air; the carbon dioxide separation membrane is disposed inside the filter box;
[0009] The absorption liquid circulating device comprises a liquid storage tank and a circulating pipeline, the liquid storage tank and the filter tank are connected with the circulating pipeline to realize mutual communication, and a circulating pump is arranged on the circulating pipeline to deliver the absorption liquid in the liquid storage tank into the filter tank and make the absorption liquid in the filter tank return to the liquid storage tank.
[0010] By adopting the above technical scheme, the blower is used to send the flue gas to be treated into the gas filter device, so as to ensure that the flue gas is uniformly distributed and passes through the carbon dioxide separation membrane. The carbon dioxide separation membrane in the filter tank can efficiently capture the carbon dioxide in the flue gas, so that the carbon dioxide passes through the micropores on the hydrophobic hollow membrane filament wall to the outside of the membrane filament to react with the absorption liquid in circulation to form sodium carbonate. The absorption liquid circulating device circulates the lye between the filter tank and the liquid storage tank through the liquid storage tank and the circulating pipeline, so that the lye can continuously react with the carbon dioxide passing through the membrane, while ensuring the continuity and stability of the absorption liquid. The circulating pump not only can deliver the absorption liquid in the liquid storage tank into the filter tank, but also can make the absorption liquid in the filter tank return to the liquid storage tank, forming a closed loop circulation, reducing the loss of the absorption liquid, and improving the operation efficiency and economy of the system.
[0011] The carbon capture membrane system structure for flue gas treatment provided by the application is simple, reliable, stable in operation and easy to maintain compared with the traditional absorption tower structure. In addition, since the chemical reaction of the lye (sodium hydroxide) and the carbon dioxide produces sodium carbonate, the sodium carbonate solution is stored in the liquid storage tank, the collection of sodium carbonate can be realized, economic benefits can be generated, and the comprehensive cost is reduced.
[0012] Preferably, the filter tank is provided with a plurality of filter tanks connected in sequence, so that the flue gas is sequentially introduced into the plurality of filter tanks.
[0013] By adopting the above technical scheme, the system can effectively improve the flue gas treatment efficiency and the carbon dioxide capture rate. Specifically, the plurality of filter tanks are connected in sequence, so that the flue gas can fully contact the carbon dioxide separation membrane when passing through each filter tank, thereby removing the carbon dioxide in the flue gas step by step, and improving the processing capacity and stability of the entire system.
[0014] Preferably, a plurality of liquid storage tanks are provided in correspondence, and the plurality of liquid storage tanks are connected in correspondence with the plurality of filter tanks.
[0015] By adopting the above technical scheme, the arrangement of multiple filter boxes enables the flue gas to gradually remove carbon dioxide and other impurities in multiple stages, and the carbon dioxide separation membrane in each filter box can be more fully contacted with the flue gas, thereby improving the carbon dioxide separation efficiency. Each filter box corresponds to a liquid storage tank, which ensures the consistency of the concentration and flow of the absorption liquid in each filter box, avoids the problem of insufficient liquid supply or too low concentration of a single liquid storage tank, and ensures the stable operation of the system. Each liquid storage tank is connected to the corresponding filter box, so that the absorption liquid can be independently circulated between the filter boxes, further improving the carbon dioxide capture effect, and also facilitating individual control and maintenance of each process.
[0016] Preferably, the multiple liquid storage tanks are sequentially connected, and the absorption liquid circulating device further comprises a sodium carbonate solution recovery pipeline, which is connected to one of the multiple liquid storage tanks.
[0017] By adopting the above technical scheme, the absorption liquid can flow between the liquid storage tanks, ensuring uniform distribution and efficient use of the absorption liquid. At the same time, the sodium carbonate solution recovery pipeline is connected to one of the multiple liquid storage tanks, which can effectively collect the generated sodium carbonate solution, facilitating subsequent processing and recycling, and improving the resource utilization rate and environmental performance of the system.
[0018] Preferably, the absorption liquid circulating device further comprises a liquid supplementing pipeline, which is connected to one of the multiple liquid storage tanks.
[0019] By adopting the above technical scheme, the liquid supplementing pipeline can supplement the absorption liquid in time, ensuring sufficient supply of the absorption liquid during system operation, maintaining the stability and continuity of the system, and improving the carbon capture efficiency.
[0020] Preferably, the system further comprises a gas-liquid separation device, which comprises a drain pipe and a liquid storage tank; the filter box has a drain port, and the liquid storage tank is connected to the drain port of the filter box through the drain pipe.
[0021] By adopting the above technical scheme, the liquid in the filter box can be effectively collected to prevent the system from being blocked or the processing efficiency from being affected due to liquid accumulation. The arrangement of the gas-liquid separation device ensures the effective discharge of the liquid, improving the stability and reliability of the system. Specifically, the liquid storage tank can conveniently collect and store the liquid discharged from the filter box, facilitating subsequent processing or recycling.
[0022] Preferably, the gas-liquid separation device further comprises a water inlet valve and a water outlet valve, the liquid storage tank has a water inlet port and a water outlet port, the water inlet port is connected to the drain pipe, and the water inlet valve is arranged on the water inlet port; the water outlet valve is arranged on the water outlet port.
[0023] By adopting the above technical scheme, the water inlet valve and the water outlet valve are additionally arranged, so that the liquid level in the liquid storage tank can be effectively controlled, and the system can be prevented from being unstable due to the excessively high or low liquid level.
[0024] Preferably, the pure water cleaning device is further included, and the pure water cleaning device comprises a flushing tank, a flushing pump and a flushing pipeline, the flushing tank is connected with the filter tank through the flushing pipeline, and the flushing pump is arranged on the flushing pipeline and used to deliver pure water into the filter tank to flush the carbon dioxide separation membrane.
[0025] By adopting the above technical scheme, the pure water cleaning device can effectively remove the deposits on the carbon dioxide separation membrane, maintain the cleanliness and separation efficiency of the membrane, prolong the service life of the membrane, and reduce the maintenance cost.
[0026] In summary, the present application has at least one of the following beneficial technical effects:
[0027] 1. The flue gas is sent into the gas filtering device by the air blower, and the carbon dioxide in the flue gas is efficiently separated by the carbon dioxide separation membrane, so that the carbon capture efficiency is significantly improved;
[0028] 2. The absorption liquid circulating device delivers the alkali liquid in the liquid storage tank into the filter tank through the circulating pump, so that the absorption liquid can be fully contacted with the flue gas, the absorption rate of carbon dioxide is effectively improved, and the consumption of the absorption liquid is reduced;
[0029] 3. Compared with the traditional absorption tower structure, the carbon capture membrane system structure for flue gas treatment provided by the present application is simple, reliable, stable in operation and easy to maintain. In addition, since the sodium hydroxide reacts with carbon dioxide to produce sodium carbonate, the sodium carbonate solution can be stored in the liquid storage tank, so that the sodium carbonate can be collected, economic benefits can be achieved, and the comprehensive cost can be reduced. BRIEF DESCRIPTION OF DRAWINGS
[0030] Figure 1 is a schematic diagram of a pipeline structure of the carbon capture membrane system in the embodiment of the present application.
[0031] In the drawings, 1 is an air blower, 2 is a gas filtering device, 21 is a filter tank, 22 is a carbon dioxide separation membrane, 3 is an absorption liquid circulating device, 31 is a liquid storage tank, 32 is a circulating pipeline, 33 is a recovery pipeline, 34 is a liquid supplementing pipeline, 4 is a gas-liquid separation device, 41 is a drain pipe, 42 is a liquid storage tank, 43 is a water inlet valve, 44 is a water outlet valve, 5 is a pure water cleaning device, 51 is a flushing tank, 52 is a flushing pump, and 53 is a flushing pipeline. DETAILED DESCRIPTION
[0032] The present application will be described in detail below. Figure 1 The present application will be described in detail below.
[0033] The carbon capture membrane system for flue gas treatment provided by the embodiments of the present application comprises Figure 1 , which comprises a blower 1, a gas filtering device 2, an absorption liquid circulating device 3, a gas-liquid separation device 4 and a pure water cleaning device 5. The gas filtering device 2 comprises a filtering box 21 and a carbon dioxide separation membrane 22, and the filtering box 21 is connected with the blower 1 through a pipeline to realize air supply. The carbon dioxide separation membrane 22 is arranged in the filtering box 21, so that the carbon dioxide in the flue gas can be enriched on the carbon dioxide separation membrane 22.
[0034] The absorption liquid circulating device 3 comprises a liquid storage tank 31 and a circulating pipeline 32, and the liquid storage tank 31 stores an alkali solution (sodium hydroxide solution) as a carbon dioxide absorption liquid. The liquid storage tank 31 and the filtering box 21 are connected with the circulating pipeline 32 to realize mutual communication, and a circulating pump is arranged on the circulating pipeline 32 to deliver the absorption liquid in the liquid storage tank 31 to the filtering box 21. The absorption liquid reacts with the carbon dioxide on the carbon dioxide separation membrane 22 to generate sodium carbonate and obtain a sodium carbonate solution, and the circulating pump makes the absorption liquid in the filtering box 21 return to the liquid storage tank 31 to realize the recovery of the sodium carbonate solution. This configuration enables the system to efficiently treat the carbon dioxide in the flue gas while maintaining a low operating cost and maintenance difficulty.
[0035] The carbon dioxide separation membrane 22 can adopt a hollow fiber hydrophobic polypropylene membrane and a hollow fiber polyimide membrane, etc., which has good gas permeation performance and chemical stability and is suitable for long-time operation.
[0036] Further, the filtering box 21 is provided with multiple filtering boxes 21 and is connected in sequence to make the flue gas pass into the multiple filtering boxes 21 in sequence. This further improves the processing capacity and efficiency of the system and ensures that the carbon dioxide in the flue gas is completely separated and captured.
[0037] Specifically, in the embodiments of the present application, the filtering box 21 is provided with five filtering boxes 21 and is sequentially arranged as a first-stage filtering, a second-stage filtering, a third-stage filtering, a fourth-stage filtering and a fifth-stage filtering. The five filtering boxes 21 can be connected in series through a pipeline, the flue gas passes through each filtering box 21 in sequence, the carbon dioxide capture rate is gradually increased, and the effective purification of the flue gas is realized.
[0038] Further, multiple liquid storage tanks 31 are arranged corresponding to the filtering box 21, and the multiple liquid storage tanks 31 are connected with the multiple filtering boxes 21 one by one. This design can better manage the flow and circulation of the absorption liquid and ensure that the absorption liquid in each filtering box 21 is in the best state.
[0039] Specifically, in the embodiment of the present application, five liquid storage tanks 31 are provided, and a liquid level sensor is arranged in each of the liquid storage tanks 31 to monitor the liquid level in the liquid storage tank 31 in real time. The plurality of liquid storage tanks 31 are connected in series. A liquid supplement pipeline 34 is arranged on the first liquid storage tank 31 to supplement sodium hydroxide solution into the liquid storage tank 31. A sodium carbonate solution recovery pipeline 33 is arranged on the last liquid storage tank 31 to collect the generated sodium carbonate solution.
[0040] The absorption liquid in the liquid storage tank 31 is transported to the filter tank 21 by the circulating pump, and reacts with the carbon dioxide in the flue gas to generate sodium carbonate. The generated sodium carbonate solution returns to the liquid storage tank 31 through the circulating pipeline and is stored in the liquid storage tank 31, and is collected through the recovery pipeline 33 to realize the reuse of resources.
[0041] Further, the present application additionally provides a gas-liquid separation device 4, which includes a drain pipe 41 and a liquid storage tank 42. The filter tank 21 has a drain port, the liquid storage tank 42 has a water inlet and a water outlet, and the water inlet of the liquid storage tank 42 is communicated with the drain port of the filter tank 21 through the drain pipe 41. Since a small amount of water vapor in the filter tank 21 can penetrate through the carbon dioxide separation membrane 22, and water accumulation may occur after a long time, the accumulated water can be discharged into the liquid storage tank 42 through the drain pipe 41.
[0042] The gas-liquid separation device 4 further includes a water inlet valve 43 and a water outlet valve 44, and the water inlet valve 43 is arranged on the water inlet and the water outlet valve 44 is arranged on the water outlet, so as to flexibly control the opening and closing of the liquid storage tank 42 and adjust the liquid level in the liquid storage tank 42, to ensure the normal and stable operation of the carbon capture membrane system.
[0043] Further, the present application additionally provides a pure water cleaning device 5, which includes a flushing tank 51, a flushing pump 52 and a flushing pipeline 53, and the flushing tank 51 is connected with the filter tank 21 through the flushing pipeline 53. The flushing pump 52 is arranged on the flushing pipeline 53 to transport pure water into the filter tank 21 to realize the flushing of the carbon dioxide separation membrane 22.
[0044] In order to improve the cleaning effect of the carbon dioxide separation membrane 22, the embodiment of the present application adopts a backwashing mode, that is, the flushing pipeline 53 is connected with the exhaust end of the last filter tank 21, so that the flushing direction is opposite to the flue gas filtering direction and sequentially passes through the plurality of filter tanks 21, and the waste water generated after cleaning is discharged from the air inlet end of the first filter tank 21.
[0045] The above are preferred embodiments of the present application, which do not limit the protection scope of the present application, therefore: any equivalent changes made on the structure, shape and principle of the present application should be covered within the protection scope of the present application.
Claims
1. A carbon capture membrane system for flue gas treatment, characterized by: The device comprises a blower (1), a gas filtering device (2), and an absorption liquid circulating device (3). The gas filtering device (2) comprises a filtering box (21) and a carbon dioxide separation membrane (22); the filtering box (21) is connected with the blower (1) through a pipeline to realize air supply; the carbon dioxide separation membrane (22) is arranged in the filtering box (21). The absorption liquid circulating device (3) comprises a liquid storage tank (31) and a circulating pipeline (32); the liquid storage tank (31) and the filtering box (21) are both connected with the circulating pipeline (32) to realize mutual communication; a circulating pump is arranged on the circulating pipeline (32) to deliver the absorption liquid in the liquid storage tank (31) to the filtering box (21) and make the absorption liquid in the filtering box (21) return to the liquid storage tank (31).
2. The carbon capture membrane system for flue gas treatment of claim 1, wherein: The filtering box (21) is provided with a plurality of filtering boxes (21) which are connected in sequence to make the flue gas pass into the plurality of filtering boxes (21) in sequence.
3. The carbon capture membrane system for flue gas treatment of claim 2, wherein: A plurality of liquid storage tanks (31) are provided in correspondence, and the plurality of liquid storage tanks (31) are connected with the plurality of filtering boxes (21) in one-to-one correspondence.
4. The carbon capture membrane system for flue gas treatment of claim 3, wherein: The plurality of liquid storage tanks (31) are connected in sequence, and the absorption liquid circulating device (3) further comprises a sodium carbonate solution recovery pipeline (33) which is connected with one of the plurality of liquid storage tanks (31).
5. The carbon capture membrane system for flue gas treatment of claim 4, wherein: The absorption liquid circulating device (3) further comprises a liquid supplementing pipeline (34) which is connected with one of the plurality of liquid storage tanks (31).
6. The carbon capture membrane system for flue gas treatment of claim 1, wherein: The device further comprises a gas-liquid separation device (4) which comprises a drain pipe (41) and a liquid storage tank (42); the filtering box (21) has a drain port, and the liquid storage tank (42) is connected with the drain port of the filtering box (21) through the drain pipe (41).
7. The carbon capture membrane system for flue gas treatment of claim 6, wherein: The gas-liquid separation device (4) further comprises a water inlet valve (43) and a water outlet valve (44); the liquid storage tank (42) has a water inlet port and a water outlet port; the water inlet port is connected with the drain pipe (41), and the water inlet valve (43) is arranged on the water inlet port; and the water outlet valve (44) is arranged on the water outlet port.
8. The carbon capture membrane system for flue gas treatment of claim 1, wherein: The device further comprises a pure water cleaning device (5) which comprises a flushing box (51), a flushing pump (52), and a flushing pipeline (53); the flushing box (51) is connected with the filtering box (21) through the flushing pipeline (53); and the flushing pump (52) is arranged on the flushing pipeline (53) to deliver pure water to the filtering box (21) to realize flushing of the carbon dioxide separation membrane (22).