Flue gas CO2 trapping system

Abstract

The invention discloses a flue gas CO2 trapping system, and relates to the field of CO2 trapping, the flue gas CO2 trapping system comprises a pretreatment tower, an absorption tower is arranged on one side of the pretreatment tower, a desorption tower is arranged on one side of the absorption tower, a plurality of desorption plates are mounted in the desorption tower, a rich liquid cooling mechanism is arranged between a rich liquid pump and the desorption tower, and a plurality of desorption plates are mounted in the desorption tower. A dispersion mechanism is arranged in the desorption tower. One part of the rich absorption liquid passes through the lean-rich liquid heat exchanger and then enters the desorption tower from the upper part of the desorption tower, the dispersing mechanism disperses the rich absorption liquid entering the desorption tower, the other part of the rich absorption liquid is fed into the rich liquid cooling mechanism, and the rich liquid cooling mechanism cools carbon dioxide and water vapor discharged from the desorption tower; therefore, a mixture of carbon dioxide gas and water vapor from the top of the desorption tower can be cooled to about 40 DEG C through the rich liquid cooling mechanism, condensate water is separated out, and the condensate water returns to a trapping system for recycling.

Description

Technical Field

[0001] The present application relates to the field of CO2 capture, and in particular to a flue gas CO2 capture system. Background Art

[0002] The capture of carbon dioxide using absorbent liquid is a technology that uses specific liquid absorbents to capture carbon dioxide. In this system, CO2 reacts chemically with the absorbent to form unstable salts. After heating, these salts will re-release CO2. Common absorbents include ammonia solution, hot potash method, organic amine absorption method and lithium salt absorption method. This technology is mainly used in industries with low CO2 emission concentrations, such as conventional coal-fired power plants, natural gas processing, etc.

[0003] Before the absorption process, the flue gas needs to be pretreated to remove impurities such as particulate matter, sulfur oxides and nitrogen oxides in the flue gas to protect the absorption system and improve the absorption efficiency. After pretreatment, the flue gas enters the absorption tower and contacts with the absorption liquid. At this stage, CO2 reacts chemically with the absorption liquid to form unstable compounds. Common absorption liquids include organic amine solutions, ionic liquid absorbents, ammonia water absorbents and new phase change absorbents. In the absorption tower, CO2 is absorbed and enriched by the absorption liquid to form a CO2-rich solution. The CO2-rich solution is sent to the desorption tower, and under certain conditions (such as heating, decompression, etc.), CO2 is released from the solution to achieve regeneration of the absorption liquid. The CO2 released from the desorption tower is further compressed and purified to meet the requirements of subsequent transportation or storage.

[0004] When desorbing the CO2 absorption liquid, the CO2 absorption liquid is generally sent to a desorption tower. When the absorption liquid passes through the desorption tower, high-temperature water vapor is introduced from the bottom of the desorption tower, and then the high-temperature water vapor heats the absorption liquid, so that the CO2 in the absorption liquid is separated from the absorption liquid, and then discharged from the top of the desorption tower. When the CO2 is discharged, it is generally mixed with a large amount of water vapor, and the water vapor will move to the next step together with the CO2, which not only affects the subsequent treatment of the CO2, but also causes a waste of water vapor. Summary of the invention

[0005] The purpose of the present application is to solve the problem raised in the above-mentioned background technology that when CO2 is discharged, it is generally mixed with a large amount of water vapor, and the water vapor will move to the next step together with the CO2, which not only affects the subsequent treatment of CO2, but also causes the waste of water vapor. The present application provides a flue gas CO2 capture system.

[0006] In order to achieve the above-mentioned purpose, this application specifically adopts the following technical solutions: The flue gas CO2 capture system comprises a pretreatment tower, an absorption tower is arranged on one side of the pretreatment tower, the pretreatment tower and the absorption tower are connected by a pipeline, a desorption tower is arranged on one side of the absorption tower, the pretreatment tower and the desorption tower are connected by a pipeline, a plurality of desorption plates are installed in the desorption tower, a pretreatment cooler is installed between the pretreatment tower and the absorption tower, a lean liquid pump is installed at the upper end of the absorption tower, a rich liquid pump is installed at the lower end of the absorption tower, a lean and rich liquid heat exchanger is arranged between the rich liquid pump and the desorption tower, a rich liquid cooling mechanism is arranged between the rich liquid pump and the desorption tower, and a dispersion mechanism is arranged in the desorption tower.

[0007] By adopting the above technical scheme, a part of the rich absorbent passes through the lean-rich liquid heat exchanger, and then enters the desorption tower from the top of the desorption tower, and then the rich absorbent passes through several desorption plates in turn, and at the same time, high-temperature steam is introduced from the bottom of the desorption tower to allow the high-temperature steam to contact the rich absorbent. At the same time, the dispersion mechanism disperses the rich absorbent entering the desorption tower, so that the rich absorbent increases the contact area between the rich absorbent and the high-temperature steam when it flows, thereby improving the separation efficiency of carbon dioxide. At the same time, the rich liquid pump sends another part of the rich absorbent into the rich liquid cooling mechanism, and the rich liquid cooling mechanism cools the carbon dioxide and water vapor discharged from the desorption tower, condenses the water vapor into water and cools the carbon dioxide, and then uses a separator to separate the condensed water and carbon dioxide, so that the mixture of carbon dioxide gas and water vapor coming out of the top of the desorption tower can be cooled to about 40°C by the rich liquid cooling mechanism, and the condensed water is separated. The condensed water is returned to the capture system for recycling, and the gas is purified by the filter and sent to the subsequent steps as gaseous carbon dioxide raw gas.

[0008] Furthermore, the rich liquid cooling mechanism includes a cooling chamber arranged on the desorption tower, the cooling chamber is connected to the desorption tower, a reciprocating cooling pipe is fixed in the cooling chamber, a rich liquid delivery pipe is arranged between the reciprocating cooling pipe and the rich liquid pump, the rich liquid pump and the cooling pipe are connected by the rich liquid delivery pipe, and the reciprocating cooling pipe is connected to the lean liquid pump.

[0009] By adopting the above technical solution, a part of the rich absorption liquid is transported to the cooling pipe in the cooling chamber through the rich liquid delivery pipe by using a rich liquid pump. When the high-temperature water vapor and carbon dioxide discharged from the desorption tower pass through the cooling pipe, the water vapor is cooled into condensed water, so that the water vapor discharged from the desorption tower can be easily returned to the capture system for recycling and utilization, thereby reducing the waste of water resources.

[0010] Furthermore, the dispersion mechanism includes a support rod arranged in the desorption tower, the support rod passes through a plurality of desorption plates and is rotatably connected to the desorption plates, a plurality of dispersion plates are arranged on the support rod, a plurality of dispersion holes are opened on the dispersion plate, a plurality of evenly distributed dispersion grooves are opened on the side of the dispersion plate close to the desorption plate, the dispersion plate corresponds to the desorption plate, an interference assembly is arranged between the dispersion plate and the support rod, a driving assembly is arranged at one end of the support rod, a plurality of scraping assemblies are arranged on the support rod, and the scraping assemblies correspond to the desorption plate.

[0011] By adopting the above technical solution, the driving component drives the support rod, the support rod drives the resistance component, the resistance component drives the dispersion plate, the dispersion plate moves on the desorption plate, the dispersion plate stirs the rich absorption liquid passing through, so that the rich absorption liquid can fully contact with water vapor, thereby increasing the contact area between the rich absorption liquid passing through the desorption plate and the water vapor, thereby improving the efficiency of separating carbon dioxide from the rich absorption liquid.

[0012] Furthermore, the resistance assembly includes a resistance rod fixed on the support rod, the resistance rod is slidably connected to a sliding rod, the sliding rod is fixedly connected to the dispersion plate, a plurality of resistance springs are arranged between the sliding rod and the resistance rod, and both ends of the resistance spring are fixedly connected to the resistance rod and the sliding rod.

[0013] By adopting the above technical solution, the resistance spring on the resistance rod pushes the sliding rod, and the sliding rod pushes the dispersion plate, so that the dispersion plate always resists the desorption plate when moving, thereby reducing the possibility of rich absorption liquid adhering to the desorption plate and improving the efficiency of the passage of rich absorption liquid.

[0014] Furthermore, the driving assembly includes a driving motor fixed on the desorption tower, the output end of the driving motor passes through the desorption tower and is fixed with a second bevel gear, the second bevel gear is meshedly connected with a first bevel gear, and the first bevel gear is fixedly connected to one end of the support rod.

[0015] By adopting the above technical solution, the output end of the driving motor drives bevel gear 2, which drives bevel gear 1, and bevel gear 1 drives the support rod supported by the desorption plate, so that when the rich absorption liquid passes through the desorption plate, the support rod can drive the dispersion plate to rotate.

[0016] Furthermore, the scraping assembly comprises a scraping plate arranged on the support rod, a scraping rod is arranged on the scraping plate, the scraping rod is fixedly connected to the support rod, and a support member is arranged between the scraping rod and the scraping plate.

[0017] By adopting the above technical solution, the scraper rod drives the support member, and the support member drives the scraper plate, so that the scraper plate moves along the inner wall of the desorption tower, thereby reducing the adhesion of rich absorption liquid to the inner wall of the desorption tower and improving the passing efficiency of the rich absorption liquid.

[0018] Furthermore, the support member includes a support spring arranged between the scraper plate and the scraper rod, both ends of the support spring are fixedly connected to the scraper rod and the scraper plate, a limiting sleeve rod is fixed on the scraper plate, and the limiting sleeve rod is slidably connected to the scraper rod.

[0019] By adopting the above technical solution, the scraper rod drives the limiting sleeve rod, and the limiting sleeve rod drives the scraper plate to move. At the same time, the supporting spring in the limiting sleeve rod pushes the scraper plate, so that the scraper rod can drive the scraper plate to move while keeping the scraper plate against the inner wall of the desorption tower.

[0020] Furthermore, an auxiliary rod is fixed on the bevel gear, a plurality of auxiliary plates are fixed on the auxiliary rod, and a plurality of spoiler holes are formed on the auxiliary plates.

[0021] By adopting the above technical solution, the auxiliary rod drives the auxiliary plate, so that the auxiliary plate, under the action of the spoiler holes, turbulently disperses the water vapor entering the bottom of the desorption tower, so that the water vapor can move upward evenly and improve the contact efficiency between the water vapor and the absorption liquid.

[0022] In summary, the present application includes at least one of the following beneficial effects: 1. In the present application, when the rich absorption liquid is sent to the desorption tower, a part of the rich absorption liquid is transported to the cooling pipe in the cooling chamber by using a rich liquid pump through a rich liquid transport pipe. When the high-temperature water vapor and carbon dioxide discharged from the desorption tower pass through the cooling pipe, the water vapor is cooled into condensed water, and at the same time, the rich absorption liquid re-enters the absorption tower from the cooling pipe and mixes with the lean absorption liquid to absorb carbon dioxide, thereby achieving the purpose of facilitating the return of the water vapor discharged from the desorption tower to the capture system for recycling, reducing the waste of water resources, and at the same time reducing the water vapor content in the carbon dioxide, so as to facilitate the subsequent steps.

[0023] 2. In the present application, when the rich absorption liquid is sent into the desorption tower, the rich absorption liquid passes through the desorption plates in the desorption tower in turn, and high-temperature water vapor is introduced from the bottom of the desorption tower. When the water vapor contacts the rich absorption liquid, the driving motor drives bevel gear two, and bevel gear two drives bevel gear one, and bevel gear one drives the support rod, and the support rod drives the resistance assembly, and the resistance assembly drives the dispersion plate, and the dispersion plate moves on the desorption plate, and the dispersion plate stirs the rich absorption liquid passing through so that the rich absorption liquid is fully in contact with the water vapor. At the same time, the support rod drives the scraping assembly, and the scraping assembly moves along the inner wall of the desorption tower, and the scraping assembly scrapes the rich absorption liquid attached to the inner wall of the desorption tower, thereby achieving the purpose of increasing the contact area between the rich absorption liquid passing through the desorption plate and the water vapor and improving the efficiency of separating carbon dioxide from the rich absorption liquid.

[0024] 3. In the present application, when the bevel gear rotates, the bevel gear drives the auxiliary rod, and the auxiliary rod drives the auxiliary plate, so that the auxiliary plate, under the action of the spoiler hole, turbulently disperses the water vapor entering the bottom of the desorption tower, allowing the water vapor to move evenly upward, thereby achieving the purpose of allowing the water vapor to move evenly upward and improving the efficiency of the contact between the water vapor and the absorption liquid. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is a system schematic diagram of the capture system in this application; Figure 2 It is a schematic diagram of the first three-dimensional structure of the desorption tower in this application; Figure 3 It is a schematic diagram of the internal structure of the desorption tower in this application; Figure 4 This application Figure 3 The enlarged schematic diagram at A in the middle; Figure 5 This application Figure 3 The enlarged schematic diagram of point B in the middle; Figure 6 This application Figure 3 Enlarged schematic diagram at point C in the middle.

[0026] Description of reference numerals: 1. Pretreatment tower; 2. Pretreatment cooler; 3. Absorption tower; 4. Lean liquid pump; 5. Rich liquid cooling mechanism; 51. Rich liquid delivery pipe; 52. Cooling chamber; 53. Cooling pipe; 6. Desorption tower; 7. Dispersion mechanism; 71. Support rod; 72. Dispersion plate; 73. Resistance assembly; 731. Resistance rod; 732. Sliding rod; 733. Resistance spring; 74. Driving assembly; 741. Driving motor; 742. Bevel gear one; 743. Bevel gear two; 75. Scraping assembly; 751. Scraping plate; 752. Scraping rod; 753. Support member; 7531. Limiting sleeve rod; 7532. Support spring; 76. Auxiliary rod; 77. Auxiliary plate; 78. Turbine hole; 8. Desorption plate; 9. Lean and rich liquid heat exchanger; 10. Rich liquid pump. DETAILED DESCRIPTION

[0027] The following is combined with Figure 1 —5 further describes this application in detail.

[0028] The embodiments of the present application disclose a flue gas CO2 capture system.

[0029] Reference Figure 1 , Figure 2 and Figure 3 The flue gas CO2 capture system includes a pretreatment tower 1, an absorption tower 3 is arranged on one side of the pretreatment tower 1, the pretreatment tower 1 and the absorption tower 3 are connected by a pipeline, a desorption tower 6 is arranged on one side of the absorption tower 3, the pretreatment tower 1 and the desorption tower 6 are connected by a pipeline, a plurality of desorption plates 8 are installed in the desorption tower 6, a pretreatment cooler 2 is installed between the pretreatment tower 1 and the absorption tower 3, a lean liquid pump 4 is installed at the upper end of the absorption tower 3, a rich liquid pump 10 is installed at the lower end of the absorption tower 3, a lean and rich liquid heat exchanger 9 is arranged between the rich liquid pump 10 and the desorption tower 6, a rich liquid cooling mechanism 5 is arranged between the rich liquid pump 10 and the desorption tower 6, and a dispersion mechanism 7 is arranged in the desorption tower 6.

[0030] The flue gas without dust and sulfide is introduced into the pretreatment tower 1, and the flue gas in the pretreatment tower 1 is passed through the pretreatment cooler 2, and the pretreatment cooler 2 is used to cool the flue gas. Then, the flue gas is passed from the bottom of the absorption tower 3, and at the same time, the lean liquid pump 4 is used to let the lean absorption liquid enter from the top of the absorption tower 3, so that the absorption liquid contacts the flue gas, and then the absorption liquid absorbs the carbon dioxide in the flue gas to become rich absorption liquid. The flue gas that has absorbed carbon dioxide is discharged from the top of the absorption tower 3, and then the rich absorption liquid is gathered at the bottom of the absorption tower 3, and then a part of the rich absorption liquid is pumped out by the rich liquid pump 10. The rich absorption liquid passes through the lean-rich liquid heat exchanger 9, and then enters the desorption tower 6 from the top of the desorption tower 6. The rich absorption liquid then passes through a number of desorption plates 8 in sequence. At the same time, high-temperature steam is introduced from the bottom of the desorption tower 6 to allow the high-temperature steam to contact the rich absorption liquid, so that the carbon dioxide in the rich absorption liquid is separated from the absorption liquid. Then, the carbon dioxide and water vapor are discharged from the top of the desorption tower 6 together. The absorption liquid separated from the carbon dioxide enters the lean-rich liquid heat exchanger 9 from the desorption tower 6 to heat the rich absorption liquid that has passed through, and to cool the absorption liquid that has just been separated from the carbon dioxide. Then, the lean liquid The rich liquid pump 10 sends another part of the rich absorption liquid to the rich liquid cooling mechanism 5. The rich liquid cooling mechanism 5 cools the carbon dioxide and water vapor discharged from the desorption tower 6, condenses the water vapor into water and cools the carbon dioxide, and then uses a separator to separate the condensed water and carbon dioxide. The condensed water is then circulated to the absorption tower 3 for recycling. At the same time, the dispersion mechanism 7 disperses the rich absorption liquid entering the desorption tower 6, so that the contact surface between the rich absorption liquid and the high-temperature steam is increased when the rich absorption liquid flows. In order to improve the separation efficiency of carbon dioxide, a part of the rich absorbent is sent to the rich liquid cooling mechanism 5 when the rich absorbent is sent to the desorption tower 6, and the mixed gas of water vapor and carbon dioxide discharged from the desorption tower 6 is cooled by the rich liquid cooling mechanism 5, so that the mixture of carbon dioxide gas and water vapor coming out of the top of the desorption tower 6 can be cooled to about 40°C by the rich liquid cooling mechanism 5, and the condensed water is separated, and the condensed water is returned to the capture system for recycling. After the gas is purified by the filter, it is sent to the subsequent steps as gaseous carbon dioxide raw gas.

[0031] Reference Figure 1The rich liquid cooling mechanism 5 includes a cooling chamber 52 arranged on the desorption tower 6, the cooling chamber 52 is connected to the desorption tower 6, a reciprocating cooling pipe 53 is fixed in the cooling chamber 52, a rich liquid delivery pipe 51 is arranged between the reciprocating cooling pipe 53 and the rich liquid pump 10, the rich liquid pump 10 and the cooling pipe 53 are connected by the rich liquid delivery pipe 51, and the reciprocating cooling pipe 53 is connected to the lean liquid pump 4. When the rich absorption liquid is sent to the desorption tower 6, a part of the rich absorption liquid is transported to the cooling pipe 53 in the cooling chamber 52 by the rich liquid pump 10 through the rich liquid delivery pipe 51. When the high-temperature water vapor and carbon dioxide discharged from the desorption tower 6 pass through the cooling pipe 53, the water vapor is cooled into condensed water. At the same time, the rich absorption liquid re-enters the absorption tower 3 from the cooling pipe 53 and mixes with the lean absorption liquid to absorb carbon dioxide. By transporting a part of the rich absorption liquid to the cooling pipe 53 in the cooling chamber 52, the water vapor is cooled into condensed water, so that the water vapor discharged from the desorption tower 6 can be easily returned to the capture system for recycling, thereby reducing the waste of water resources.

[0032] Reference Figure 2 and Figure 3 The dispersion mechanism 7 includes a support rod 71 arranged in the desorption tower 6, the support rod 71 passes through a plurality of desorption plates 8 and is rotatably connected to the desorption plates 8, a plurality of dispersion plates 72 are arranged on the support rod 71, a plurality of dispersion holes are opened on the dispersion plate 72, a plurality of evenly distributed dispersion grooves are opened on the side of the dispersion plate 72 close to the desorption plate 8, the dispersion plate 72 corresponds to the desorption plate 8, an interference component 73 is arranged between the dispersion plate 72 and the support rod 71, a driving component 74 is arranged at one end of the support rod 71, a plurality of scraping components 75 are arranged on the support rod 71, and the scraping components 75 correspond to the desorption plate 8.

[0033] When the rich absorption liquid is sent into the desorption tower 6, the rich absorption liquid passes through the desorption plate 8 in the desorption tower 6 in turn, and high-temperature water vapor is introduced from the bottom of the desorption tower 6. When the water vapor contacts the rich absorption liquid, the driving component 74 drives the support rod 71, and the support rod 71 drives the resistance component 73, and the resistance component 73 drives the dispersion plate 72. The dispersion plate 72 moves on the desorption plate 8, and the dispersion plate 72 stirs the rich absorption liquid passing through, so that the rich absorption liquid is fully in contact with the water vapor. At the same time, the support rod 71 drives the scraping component 75, and the scraping component 75 moves along the inner wall of the desorption tower 6, and the scraping component 75 scrapes the rich absorption liquid attached to the inner wall of the desorption tower 6. By using the driving component 74 to drive the support rod 71, and the support rod 71 drives the dispersion plate 72 and the scraping component 75, the rich absorption liquid passing through the desorption plate 8 can increase the contact area with the water vapor, thereby improving the efficiency of separating carbon dioxide from the rich absorption liquid.

[0034] Reference Figure 3 and Figure 4The resistance assembly 73 includes a resistance rod 731 fixed on the support rod 71, a sliding rod 732 is slidably connected to the resistance rod 731, the sliding rod 732 is fixedly connected to the dispersion plate 72, a plurality of resistance springs 733 are arranged between the sliding rod 732 and the resistance rod 731, and both ends of the resistance spring 733 are fixedly connected to the resistance rod 731 and the sliding rod 732.

[0035] When the support rod 71 rotates, the support rod 71 drives the resistance rod 731, the resistance rod 731 drives the dispersion plate 72, and at the same time the resistance spring 733 on the resistance rod 731 pushes the sliding rod 732, and the sliding rod 732 pushes the dispersion plate 72, so that the dispersion plate 72 always resists the desorption plate 8 when moving. By allowing the dispersion plate 72 to maintain resistance on the desorption plate 8 under the push of the resistance spring 733, the possibility of rich absorption liquid adhering to the desorption plate 8 can be reduced, thereby improving the efficiency of the passage of rich absorption liquid.

[0036] Reference Figure 3 and Figure 5 The driving assembly 74 includes a driving motor 741 fixed on the desorption tower 6. The output end of the driving motor 741 passes through the desorption tower 6 and is fixed with a bevel gear 2 743. The bevel gear 2 743 is meshedly connected with a bevel gear 1 742. The bevel gear 1 742 is fixedly connected to one end of the support rod 71.

[0037] When the support rod 71 needs to rotate, the output end of the driving motor 741 drives the bevel gear 2 743, the bevel gear 2 743 drives the bevel gear 1 742, the bevel gear 1 742 drives the support rod 71 supported by the desorption plate 8, and the support rod 71 drives the dispersion plate 72 to rotate on the desorption plate 8. By allowing the driving motor 741 to drive the bevel gear 2 743, the bevel gear 2 743 drives the bevel gear 1 742, and the bevel gear 1 742 drives the support rod 71 to rotate, the support rod 71 can drive the dispersion plate 72 to rotate when the rich absorption liquid passes through the desorption plate 8.

[0038] Reference Figure 3 and Figure 6The scraping assembly 75 includes a scraping plate 751 disposed on the support rod 71, a scraping rod 752 is disposed on the scraping plate 751, the scraping rod 752 is fixedly connected to the support rod 71, and a support member 753 is disposed between the scraping rod 752 and the scraping plate 751. When the support rod 71 rotates, the support rod 71 drives the scraping rod 752, the scraping rod 752 drives the support member 753, and the support member 753 drives the scraping plate 751, so that the scraping plate 751 moves along the inner wall of the desorption tower 6. When the scraping plate 751 moves, the rich absorption liquid attached to the inner wall of the desorption tower is scraped off. By driving the scraping plate 751 to move along the inner wall of the desorption tower 6 when the support rod 71 rotates, the rich absorption liquid attached to the inner wall of the desorption tower can be reduced, thereby improving the passing efficiency of the rich absorption liquid.

[0039] Reference Figure 3 and Figure 6 The support member 753 includes a support spring 7532 disposed between the scraper plate 751 and the scraper rod 752. Both ends of the support spring 7532 are fixedly connected to the scraper rod 752 and the scraper plate 751. A limiting sleeve rod 7531 is fixed on the scraper plate 751, and the limiting sleeve rod 7531 is slidably connected to the scraper rod 752. When the support rod 71 drives the scraper rod 752 to rotate, the scraper rod 752 drives the limiting sleeve rod 7531, and the limiting sleeve rod 7531 drives the scraper plate 751 to move. At the same time, the support spring 7532 in the limiting sleeve rod 7531 pushes the scraper plate 751, so that the scraper plate 751 is against the inner wall of the desorption tower 6. Under the push of the support spring 7532 and the limit of the limiting sleeve rod 7531, the scraper plate 751 can be kept against the inner wall of the desorption tower 6 while the scraper rod 752 drives the scraper plate 751 to move.

[0040] Reference Figure 3 and Figure 5 An auxiliary rod 76 is fixed on the bevel gear 1 742, and a plurality of auxiliary plates 77 are fixed on the auxiliary rod 76. A plurality of flow disturbance holes 78 are provided on the auxiliary plate 77. When the bevel gear 1 742 rotates, the bevel gear 1 742 drives the auxiliary rod 76, and the auxiliary rod 76 drives the auxiliary plate 77, so that the auxiliary plate 77, under the action of the flow disturbance holes 78, disturbs and disperses the water vapor entering the bottom of the desorption tower, so that the water vapor moves upward evenly. By using the support rod 71 to drive the auxiliary rod 76, the auxiliary rod 76 drives the auxiliary plate 77, and the auxiliary plate 77 disturbs the water vapor, so that the water vapor can move upward evenly, thereby improving the contact efficiency between the water vapor and the absorption liquid.

[0041] Working principle: Flue gas without dust and sulfide is introduced into the pretreatment tower 1, and the flue gas in the pretreatment tower 1 is passed through the pretreatment cooler 2, and the pretreatment cooler 2 is used to cool the temperature of the flue gas, and then the flue gas is passed into the bottom of the absorption tower 3, and at the same time, the lean liquid pump 4 allows the lean absorption liquid to enter from the top of the absorption tower 3, so that the absorption liquid contacts the flue gas, and then the absorption liquid absorbs the carbon dioxide in the flue gas and becomes rich absorption liquid, and the flue gas absorbed by the carbon dioxide is discharged from the top of the absorption tower 3, and then the rich absorption liquid is gathered at the bottom of the absorption tower 3, and a part of the rich absorption liquid is sent to the desorption tower 6, and the rich absorption liquid passes through the desorption plate 8 in the desorption tower 6 in turn, and when the support rod 71 rotates, the output end of the driving motor 741 drives the bevel gear 2 743, and the bevel gear 2 743 drives the bevel gear 1 742, and the bevel gear 1 742 drives the support rod 71 supported by the desorption plate 8, and the support rod 71 drives the dispersion plate 72 to rotate on the desorption plate 8 The support rod 71 drives the scraper plate 751 to move along the inner wall of the desorption tower 6 to scrape the rich absorption liquid attached to the inner wall. When the bevel gear 742 rotates, the bevel gear 742 drives the auxiliary rod 76, and the auxiliary rod 76 drives the auxiliary plate 77. Under the action of the turbulence hole 78, the auxiliary plate 77 performs turbulence dispersion on the water vapor entering the bottom of the desorption tower, so that the water vapor moves evenly upward, the water vapor contacts the rich absorption liquid evenly, and the carbon dioxide is separated from the rich absorption liquid. At the same time, the rich liquid pump 10 is used to transport another part of the rich absorption liquid to the cooling pipe 53 in the cooling cabin 52 through the rich liquid delivery pipe 51. When the high-temperature water vapor and carbon dioxide discharged from the desorption tower 6 pass through the cooling pipe 53, the water vapor is cooled into condensed water, and the condensed water is circulated back to the capture system. At the same time, the rich absorption liquid re-enters the absorption tower 3 from the cooling pipe 53 and mixes with the lean absorption liquid to absorb carbon dioxide.

Claims

1. A flue gas CO2 capture system, comprising a pretreatment tower (1), characterized in that: An absorption tower (3) is arranged on one side of the pretreatment tower (1), and the pretreatment tower (1) and the absorption tower (3) are connected by a pipeline. A desorption tower (6) is arranged on one side of the absorption tower (3), and the pretreatment tower (1) and the desorption tower (6) are connected by a pipeline. A plurality of desorption plates (8) are installed in the desorption tower (6). A pretreatment cooler (2) is installed between the pretreatment tower (1) and the absorption tower (3). A lean liquid pump (4) is installed at the upper end of the absorption tower (3), and a rich liquid pump (10) is installed at the lower end of the absorption tower (3). A lean-rich liquid heat exchanger (9) is arranged between the rich liquid pump (10) and the desorption tower (6). A rich liquid cooling mechanism (5) is arranged between the rich liquid pump (10) and the desorption tower (6), and a dispersion mechanism (7) is arranged in the desorption tower (6).

2. The flue gas CO2 capture system according to claim 1, characterized in that: The rich liquid cooling mechanism (5) comprises a cooling chamber (52) arranged on the desorption tower (6), the cooling chamber (52) being connected to the desorption tower (6), a reciprocating cooling pipe (53) being fixed in the cooling chamber (52), a rich liquid delivery pipe (51) being arranged between the reciprocating cooling pipe (53) and the rich liquid pump (10), the rich liquid pump (10) and the cooling pipe (53) being connected via the rich liquid delivery pipe (51), and the reciprocating cooling pipe (53) being connected to the lean liquid pump (4).

3. The flue gas CO2 capture system according to claim 1, characterized in that: The dispersion mechanism (7) comprises a support rod (71) arranged in the desorption tower (6), the support rod (71) passing through a plurality of desorption plates (8) and being rotatably connected to the desorption plates (8), a plurality of dispersion plates (72) being arranged on the support rod (71), a plurality of dispersion holes being provided on the dispersion plate (72), a plurality of uniformly distributed dispersion grooves being provided on a side of the dispersion plate (72) close to the desorption plate (8), the dispersion plate (72) corresponding to the desorption plate (8), an interference component (73) being arranged between the dispersion plate (72) and the support rod (71), a driving component (74) being arranged at one end of the support rod (71), and a plurality of scraping components (75) being arranged on the support rod (71), the scraping components (75) corresponding to the desorption plate (8).

4. The flue gas CO2 capture system according to claim 3, characterized in that: The resistance assembly (73) comprises a resistance rod (731) fixed on the support rod (71); a sliding rod (732) is slidably connected to the resistance rod (731); the sliding rod (732) is fixedly connected to the dispersion plate (72); a plurality of resistance springs (733) are arranged between the sliding rod (732) and the resistance rod (731); and both ends of the resistance spring (733) are fixedly connected to the resistance rod (731) and the sliding rod (732).

5. The flue gas CO2 capture system according to claim 3, characterized in that: The driving assembly (74) comprises a driving motor (741) fixed on the desorption tower (6); the output end of the driving motor (741) passes through the desorption tower (6) and is fixed with a second bevel gear (743); the second bevel gear (743) is meshingly connected with a first bevel gear (742); the first bevel gear (742) is fixedly connected to one end of the support rod (71).

6. The flue gas CO2 capture system according to claim 3, characterized in that: The scraping assembly (75) comprises a scraping plate (751) arranged on a support rod (71); a scraping rod (752) is arranged on the scraping plate (751); the scraping rod (752) and the support rod (71) are fixedly connected; and a support member (753) is arranged between the scraping rod (752) and the scraping plate (751).

7. The flue gas CO2 capture system according to claim 6, characterized in that: The support member (753) comprises a support spring (7532) arranged between the scraping plate (751) and the scraping rod (752); both ends of the support spring (7532) are fixedly connected to the scraping rod (752) and the scraping plate (751); a limiting sleeve rod (7531) is fixed on the scraping plate (751); and the limiting sleeve rod (7531) is slidably connected to the scraping rod (752).

8. The flue gas CO2 capture system according to claim 5, characterized in that: An auxiliary rod (76) is fixed on the bevel gear one (742), a plurality of auxiliary plates (77) are fixed on the auxiliary rod (76), and a plurality of spoiler holes (78) are formed on the auxiliary plates (77).

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