Carbon dioxide separation and recovery method using carbon dioxide absorbent

Abstract

The invention relates to the technical field of carbon dioxide separation and recovery, in particular to a carbon dioxide separation and recovery method using a carbon dioxide absorbent, which comprises the following steps: S1, waste gas pretreatment: before carbon dioxide in waste gas is separated and recovered, the waste gas containing carbon dioxide is pretreated, and impurities in the waste gas are filtered out; s2, carbon dioxide absorption: enabling the pretreated waste gas to pass through an absorption device, and enabling a carbon dioxide absorbent to be in contact for chemical reaction. According to the device, waste gas to be subjected to carbon dioxide absorption can be efficiently filtered through the arranged pretreatment assembly, impurities and particulate matter doped in the waste gas are filtered out, the contact area of an absorbent and carbon dioxide is increased, the contact time of the absorbent and the carbon dioxide is prolonged through the arranged synergistic assembly, and therefore the absorption efficiency of the carbon dioxide is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of carbon dioxide separation and recovery, and in particular to a method for separating and recovering carbon dioxide using a carbon dioxide absorbent. Background Art

[0002] Carbon dioxide absorbents are a type of substance that can interact with carbon dioxide to remove or fix carbon dioxide from a mixed gas. This interaction can be chemical or physical. The separation and recovery of carbon dioxide requires the assistance of carbon dioxide absorbents. Carbon dioxide is absorbed by the carbon dioxide absorbent and then desorbed from the absorbent by heating or reducing pressure to obtain high-purity carbon dioxide. The separation and recovery of carbon dioxide has many uses, including industrial applications, energy applications, and agricultural applications. Carbon dioxide, as a resource, can be recycled to achieve a resource cycle. Carbon dioxide can be recovered from industrial waste gas or other emission sources and converted into valuable products or used for other beneficial purposes, thereby avoiding waste of resources and complying with the concept of sustainable development.

[0003] When in use, the existing carbon dioxide separation and recovery device lacks efficient pretreatment measures for the waste gas to be treated. Since the waste gas may be mixed with some impurities or particulate matter, if it is not treated, the subsequent recovery of carbon dioxide will affect the recovery efficiency, and it will also affect the subsequent regeneration of the absorbent. In addition, when absorbing carbon dioxide, the absorbent needs to contact with carbon dioxide. Some traditional absorption methods are not efficient, and the absorbent cannot fully contact with carbon dioxide, which in turn affects the recovery efficiency and requires corresponding treatment measures. Summary of the invention

[0004] In view of the above-mentioned shortcomings of the prior art, the present invention provides a method for separating and recovering carbon dioxide using a carbon dioxide absorbent, which can effectively solve the problems of the prior art lacking pretreatment measures for waste gas and low carbon dioxide absorption efficiency.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solutions: The present invention provides a method for separating and recovering carbon dioxide using a carbon dioxide absorbent, comprising the following steps: S1. Waste gas pretreatment: Before separating and recovering the carbon dioxide in the waste gas, the waste gas containing carbon dioxide is pretreated to filter and remove impurities therein; S2. Carbon dioxide absorption: The pre-treated waste gas is passed through the absorption device to make the carbon dioxide absorbent contact and cause a chemical reaction; S3, carbon dioxide desorption and absorbent regeneration: heating the absorbent that has completed carbon dioxide absorption to desorb carbon dioxide to achieve absorbent regeneration; S4. Carbon dioxide purification, storage and utilization: The desorbed carbon dioxide gas is purified to remove impurities and moisture to obtain high-purity carbon dioxide, which is then stored or directly utilized.

[0006] The above-mentioned carbon dioxide separation and recovery process also involves an absorption device, including a body, the upper surface of the body is provided with a through groove, the through groove is fixedly connected with an air inlet pipe, the side wall of the body is provided with an air outlet, the output end of the air outlet is provided with a sealing plate, the inner bottom surface of the body is fixedly connected with a liquid storage tank, the side wall of the liquid storage tank is connected with a water inlet pipe and a water outlet pipe, the water inlet pipe and the water outlet pipe both penetrate the side wall of the body and are installed with valves; A processing mechanism, the processing mechanism comprising a pre-processing component and a synergistic component According to the above-mentioned method for separating and recovering carbon dioxide using a carbon dioxide absorbent, the pretreatment component includes a motor fixedly connected to the side wall of the body through a bracket, a No. 1 rotating shaft is fixed to the output end of the motor, and the No. 1 rotating shaft is rotatably connected to the inner wall of the body through a bearing, a partition is fixedly connected between the inner walls of the intake pipe, and a plurality of ventilation filter holes are equidistantly provided on the upper surface of the partition, a No. 2 rotating shaft is provided in the intake pipe, and the No. 2 rotating shaft is rotatably connected to the bottom surface of the partition through a bearing, a No. 1 bevel gear is fixedly connected to one end of the No. 1 rotating shaft near the No. 2 rotating shaft, a No. 2 bevel gear is circumferentially fixedly connected to the No. 2 rotating shaft, the No. 1 bevel gear is meshed with the No. 2 bevel gear, and a plurality of strip brushes are equidistantly fixedly connected to the No. 2 rotating shaft.

[0007] According to the above-mentioned method for separating and recovering carbon dioxide using a carbon dioxide absorbent, the efficiency enhancement component includes a bearing column fixedly connected to the inner bottom surface of a liquid storage tank, the inner bottom surface of the liquid storage tank is rotatably connected with a sleeve, the upper surface of the sleeve is fixedly connected to the bottom end of the No. 2 rotating shaft, the bearing column is circumferentially fixedly connected with a No. 3 bevel gear, two No. 3 rotating shafts are provided in the liquid storage tank, the two No. 3 rotating shafts are rotatably connected to the inner wall of the sleeve through bearings, the two No. 3 rotating shafts are fixedly connected to the No. 4 bevel gear at one end close to the bearing column, the two No. 4 bevel gears are meshed with the No. 3 bevel gear, and the two No. 3 rotating shafts are circumferentially fixedly connected with a plurality of stirring rods equidistantly.

[0008] According to the above-mentioned carbon dioxide separation and recovery method using a carbon dioxide absorbent, the first bevel gear and the second bevel gear are both located in the body, and the first bevel gear and the second bevel gear are respectively arranged concentrically with the first rotating shaft and the second rotating shaft.

[0009] According to the above-mentioned method for separating and recovering carbon dioxide using a carbon dioxide absorbent, the plurality of strip-shaped brushes are all located in the air intake pipe, and the plurality of strip-shaped brushes are all located above the partition.

[0010] According to the above-mentioned method for separating and recovering carbon dioxide using a carbon dioxide absorbent, the bearing column is concentrically arranged with the sleeve, and the second rotating shaft is concentrically arranged with the sleeve.

[0011] According to the above-mentioned carbon dioxide separation and recovery method using a carbon dioxide absorbent, the third bevel gear and the two fourth bevel gears are both located in the sleeve, and the two fourth bevel gears are respectively located on both sides of the third bevel gear.

[0012] According to the above-mentioned method for separating and recovering carbon dioxide using a carbon dioxide absorbent, the two third rotating shafts are respectively located on both sides of the sleeve, and the plurality of stirring rods are all located in the liquid storage tank.

[0013] Compared with the known prior art, the technical solution provided by the present invention has the following beneficial effects: 1. Through the pretreatment components, the waste gas to be absorbed by carbon dioxide can be efficiently filtered and treated, and impurities and particulate matter mixed in the waste gas can be filtered out, which is beneficial to improve the subsequent carbon dioxide absorption efficiency. At the same time, the impurities in the waste gas can be removed, and the impact on the absorbent can be reduced, which can avoid pollution to the absorbent and affect the subsequent recycling.

[0014] 2. By setting up the enhancement component, the power of the pretreatment component is used to improve the efficiency of the absorbent in absorbing carbon dioxide. Only one power output is used to achieve multiple functions, which reduces the operating cost of the equipment and is more practical. The enhancement component increases the contact area and contact time between the absorbent and carbon dioxide by efficiently stirring the absorbent, so that the absorbent and carbon dioxide are mixed more quickly and evenly, thereby improving the absorption efficiency of carbon dioxide. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] 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 or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0016] Figure 1 Schematic diagram of the process of separating and recovering carbon dioxide of the present invention; Figure 2 It is a schematic diagram of the three-dimensional structure analysis of the present invention; Figure 3A schematic diagram of a three-dimensional structural analysis of the present invention from another viewing angle; Figure 4 It is a schematic diagram of the three-dimensional structure of the present invention; Figure 5 A schematic diagram of a three-dimensional structure from another viewing angle of the present invention; Figure 6 for Figure 2 Enlarged view of point A in the middle.

[0017] Figure numerals: 1. body; 2. air inlet pipe; 3. air outlet; 4. liquid storage tank; 5. water inlet pipe; 6. water outlet pipe; 7. motor; 8. rotating shaft No. 1; 9. partition; 10. ventilation filter hole; 11. rotating shaft No. 2; 12. bevel gear No. 1; 13. bevel gear No. 2; 14. strip brush; 15. bearing column; 16. sleeve; 17. bevel gear No. 3; 18. rotating shaft No. 3; 19. bevel gear No. 4; 20. stirring rod. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are 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.

[0019] The present invention will be further described below in conjunction with the embodiments.

[0020] Example: Refer to Figures 1 to 6 , a method for separating and recovering carbon dioxide using a carbon dioxide absorbent, comprising the following steps: S1. Waste gas pretreatment: Before separating and recovering the carbon dioxide in the waste gas, the waste gas containing carbon dioxide is pretreated to filter and remove impurities therein; S2. Carbon dioxide absorption: The pre-treated waste gas is passed through the absorption device to make the carbon dioxide absorbent contact and cause a chemical reaction; S3, carbon dioxide desorption and absorbent regeneration: heating the absorbent that has completed carbon dioxide absorption to desorb carbon dioxide to achieve absorbent regeneration; S4. Carbon dioxide purification, storage and utilization: The desorbed carbon dioxide gas is purified to remove impurities and moisture to obtain high-purity carbon dioxide, which is then stored or directly utilized.

[0021] The above-mentioned carbon dioxide separation and recovery process also involves an absorption device, including a body 1, a through groove is provided on the upper surface of the body 1, an air inlet pipe 2 is fixedly connected in the through groove, an air outlet 3 is provided on the side wall of the body 1, and a sealing plate is provided at the output end of the air outlet 3, a liquid storage tank 4 is fixedly connected to the inner bottom surface of the body 1, and a water inlet pipe 5 and a water outlet pipe 6 are connected to the side wall of the liquid storage tank 4, and the water inlet pipe 5 and the water outlet pipe 6 both penetrate the side wall of the body 1, and valves are installed at the input end of the water inlet pipe 5 and the output end of the water outlet pipe 6; The processing mechanism includes a pre-processing component and an enhancement component. The pre-processing component includes a motor 7 fixedly connected to the side wall of the body 1 through a bracket. The output end of the motor 7 is fixed with a No. 1 rotating shaft 8. The No. 1 rotating shaft 8 is rotatably connected to the inner wall of the body 1 through a bearing. A partition 9 is fixedly connected between the inner walls of the air intake pipe 2. A plurality of ventilation filter holes 10 are equidistantly arranged on the upper surface of the partition 9. A No. 2 rotating shaft 11 is arranged in the air intake pipe 2. The No. 2 rotating shaft 11 is rotatably connected to the bottom surface of the partition 9 through a bearing. The No. 1 rotating shaft 8 is fixedly connected to the No. 1 bevel gear 12 at one end close to the No. 2 rotating shaft 11. The shaft 11 is fixedly connected to a No. 2 bevel gear 13 in the circumferential direction, the No. 1 bevel gear 12 is meshed with the No. 2 bevel gear 13, and a plurality of strip brushes 14 are fixedly connected to the No. 2 rotating shaft 11 at equal intervals in the circumferential direction, the No. 1 bevel gear 12 and the No. 2 bevel gear 13 are both located in the body 1, the No. 1 bevel gear 12 and the No. 2 bevel gear 13 are respectively arranged concentrically with the No. 1 rotating shaft 8 and the No. 2 rotating shaft 11, so that the pretreatment component can operate normally, the plurality of strip brushes 14 are all located in the air intake pipe 2, and the plurality of strip brushes 14 are all located above the partition 9, and the filtering efficiency of the exhaust gas is ensured by the plurality of rotating strip brushes 14; The synergistic component includes a bearing column 15 fixedly connected to the inner bottom surface of the liquid storage tank 4, the inner bottom surface of the liquid storage tank 4 is rotatably connected with a sleeve 16, the upper surface of the sleeve 16 is fixedly connected to the bottom end of the No. 2 rotating shaft 11, and the circumferential direction of the bearing column 15 is fixedly connected with a No. 3 bevel gear 17. Two No. 3 rotating shafts 18 are provided in the liquid storage tank 4. The two No. 3 rotating shafts 18 are rotatably connected to the inner wall of the sleeve 16 through bearings. The ends of the two No. 3 rotating shafts 18 close to the bearing column 15 are fixedly connected with No. 4 bevel gears 19, and the two No. 4 bevel gears 19 are connected to the No. 3 rotating shafts 18. The bevel gears 17 are meshed with each other, and a plurality of stirring rods 20 are fixedly connected to the two No. 3 rotating shafts 18 at equal intervals in the circumferential direction. The bearing column 15 is concentrically arranged with the sleeve 16, and the No. 2 rotating shaft 11 is concentrically arranged with the sleeve 16. The No. 3 bevel gear 17 and the two No. 4 bevel gears 19 are all located in the sleeve 16, and the two No. 4 bevel gears 19 are respectively located on both sides of the No. 3 bevel gear 17, and the two No. 3 rotating shafts 18 are respectively located on both sides of the sleeve 16. The plurality of stirring rods 20 are all located in the liquid storage tank 4, and the absorbent is stirred by the plurality of rotating stirring rods 20.

[0022] The working principle of the present invention is as follows: before using the device to absorb carbon dioxide in the exhaust gas, a carbon dioxide absorbent is first added into the liquid storage tank 4 through the water inlet pipe 5. The absorbent can be monoethanolamine or diethanolamine. The carbon dioxide is absorbed by a chemical method. After the absorbent is added, the exhaust gas discharge end to be treated is connected to the intake pipe 2, and the motor 7 is started. The exhaust gas enters the body 1 through the intake pipe 2. Before entering, it needs to pass through the ventilation filter hole 10. The exhaust gas is filtered through the ventilation filter hole 10 to filter out the exhaust gas. The impurities and particulates impurities and particulates are removed by the motor 7, and the motor 7 is started to drive the No. 1 rotating shaft 8 to rotate, and then the No. 1 bevel gear 12 is driven to rotate, and the No. 2 bevel gear 13 and the No. 2 rotating shaft 11 are driven to rotate through meshing transmission. The rotation of the No. 2 rotating shaft 11 drives multiple strip brushes 14 to revolve to clean the ventilation filter hole 10, so as to ensure that the ventilation filter hole 10 always has a good filtering efficiency. After the exhaust gas is filtered, it reaches the body 1 and directly reacts with the absorbent in the liquid storage tank 4, so as to achieve the absorption of carbon dioxide; During the absorption process, the No. 2 rotating shaft 11 rotates to drive the sleeve 16 to rotate, thereby causing the two No. 3 rotating shafts 18 and the No. 4 bevel gear 19 to revolve, and the No. 3 rotating shaft 18 drives multiple stirring rods 20 to revolve around the No. 2 rotating shaft 11, and the absorbent is stirred by the multiple revolving stirring rods 20. At the same time, the two No. 4 bevel gears 19 revolve and mesh with the No. 3 bevel gear 17, thereby causing themselves to rotate. The two No. 3 rotating shafts 18 rotate, causing multiple stirring rods 20 to revolve around the No. 3 rotating shaft 18, thereby causing multiple stirring rods 20 to rotate in different dimensions, thereby achieving high-quality stirring of the absorbent. In this way, the contact area and contact time between the absorbent and carbon dioxide are increased, so that the absorbent and carbon dioxide are mixed more quickly and evenly, thereby improving the absorption efficiency of carbon dioxide, as well as the subsequent separation and recovery efficiency. The gas outlet 3 is used to discharge exhaust gas, and the water outlet pipe 6 is used to discharge the absorbent. The absorbent that completes the absorption operation needs to undergo a carbon dioxide desorption operation, thereby obtaining high-purity carbon dioxide.

[0023] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for separating and recovering carbon dioxide using a carbon dioxide absorbent, characterized in that: The following steps are involved: S1. Waste gas pretreatment: Before separating and recovering the carbon dioxide in the waste gas, the waste gas containing carbon dioxide is pretreated to filter and remove impurities therein; S2. Carbon dioxide absorption: The pre-treated waste gas is passed through the absorption device to make the carbon dioxide absorbent contact and cause a chemical reaction; S3, carbon dioxide desorption and absorbent regeneration: heating the absorbent that has completed carbon dioxide absorption to desorb carbon dioxide to achieve absorbent regeneration; S4. Carbon dioxide purification and storage and utilization: The desorbed carbon dioxide gas is purified to remove impurities and moisture therein to obtain high-purity carbon dioxide, and then the purified carbon dioxide is stored or directly utilized; The absorption device comprises: A machine body (1), wherein a through groove is provided on the upper surface of the machine body (1), an air inlet pipe (2) is fixedly connected in the through groove, an air outlet (3) is provided on the side wall of the machine body (1), an output end of the air outlet (3) is provided with a sealing plate, an inner bottom surface of the machine body (1) is fixedly connected to a liquid storage tank (4), the side wall of the liquid storage tank (4) is connected to a water inlet pipe (5) and a water outlet pipe (6), one end of each of the water inlet pipe (5) and the water outlet pipe (6) passes through the side wall of the machine body (1) and is provided with a valve; The processing mechanism includes a pre-processing component and a synergistic component.

2. A method for separating and recovering carbon dioxide using a carbon dioxide absorbent according to claim 1, characterized in that: The pretreatment component comprises a motor (7) fixedly connected to the side wall of the machine body (1) through a bracket, a first rotating shaft (8) being fixedly connected to the output end of the motor (7), the first rotating shaft (8) being rotatably connected to the inner wall of the machine body (1) through a bearing, a partition (9) being fixedly connected between the inner walls of the air intake pipe (2), a plurality of ventilation filter holes (10) being equidistantly provided on the upper surface of the partition (9), a second rotating shaft (11) being provided in the air intake pipe (2), the second rotating shaft (11) being rotatably connected to the bottom surface of the partition (9) through a bearing, a first bevel gear (12) being fixedly connected to one end of the first rotating shaft (8) close to the second rotating shaft (11), a second bevel gear (13) being circumferentially fixedly connected to the second rotating shaft (11), the first bevel gear (12) being meshed with the second bevel gear (13), and a plurality of strip brushes (14) being equidistantly fixedly connected to the circumference of the second rotating shaft (11).

3. A method for separating and recovering carbon dioxide using a carbon dioxide absorbent according to claim 2, characterized in that: The enhancement component comprises a bearing column (15) fixedly connected to the inner bottom surface of a liquid storage tank (4); the inner bottom surface of the liquid storage tank (4) is rotatably connected to a sleeve (16); the upper surface of the sleeve (16) is fixedly connected to the bottom end of the second rotating shaft (11); the bearing column (15) is circumferentially fixedly connected to a third bevel gear (17); two third rotating shafts (18) are arranged in the liquid storage tank (4); the two third rotating shafts (18) are rotatably connected to the inner wall of the sleeve (16) through bearings; one end of the two third rotating shafts (18) close to the bearing column (15) is fixedly connected to a fourth bevel gear (19); the two fourth bevel gears (19) are meshed with the third bevel gear (17); and a plurality of stirring rods (20) are circumferentially equidistantly fixedly connected to the third rotating shaft (18).

4. A method for separating and recovering carbon dioxide using a carbon dioxide absorbent according to claim 3, characterized in that: The first bevel gear (12) and the second bevel gear (13) are both located in the machine body (1), and the first bevel gear (12) and the second bevel gear (13) are respectively arranged concentrically with the first rotating shaft (8) and the second rotating shaft (11).

5. The method for separating and recovering carbon dioxide using a carbon dioxide absorbent according to claim 3, characterized in that: The plurality of strip-shaped brushes (14) are all located in the air intake pipe (2), and the plurality of strip-shaped brushes (14) are all located above the partition plate (9).

6. A method for separating and recovering carbon dioxide using a carbon dioxide absorbent according to claim 3, characterized in that: The bearing column (15) and the sleeve (16) are arranged concentrically, and the second rotating shaft (11) and the sleeve (16) are arranged concentrically.

7. A method for separating and recovering carbon dioxide using a carbon dioxide absorbent according to claim 3, characterized in that: The number three bevel gear (17) and the two number four bevel gears (19) are both located in the sleeve (16), and the two number four bevel gears (19) are respectively located on both sides of the number three bevel gear (17).

8. The method for separating and recovering carbon dioxide using a carbon dioxide absorbent according to claim 3, characterized in that: The two third rotating shafts (18) are respectively located on two sides of the sleeve (16), and the plurality of stirring rods (20) are all located in the liquid storage tank (4).

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