Apparatus and method for reducing absorbent escape, carbon capture system

Abstract

The present application relates to the technical field of carbon capture, and discloses a device and method for reducing absorbent escape and a carbon capture system, the device comprising a wet growth unit and a dry absorption unit arranged in sequence along the flow direction of flue gas, the wet growth unit comprising a filler layer and an atomizing nozzle arranged above the filler layer, the atomizing nozzle being used for wetting the filler layer and forming a water vapor supersaturation environment covering the filler layer, and the dry absorption unit being filled with alkaline particulate matter, the alkaline particulate matter being used for absorbing and treating the absorbent in the flue gas flowing through the wet growth unit, the device provided by the present application has a good level of controlling and reducing absorbent escape, and can obviously save water consumption.

Description

Technical Field

[0001] The present invention relates to the technical field of carbon capture, and in particular to a device and method for reducing absorbent escape, and a carbon capture system. Background Art

[0002] Chemical absorption is considered one of the most mature and promising carbon capture technologies. However, this method faces many challenges. One of them is the exothermic reaction between the absorbent and the carbon dioxide in the flue gas in the absorption system, causing some of the absorbent to escape into the atmosphere in the form of volatilization or aerosols. This escape not only increases the operating cost of the carbon capture system but may also lead to the formation of carcinogens, causing pollution to soil organisms and drinking water sources.

[0003] In related technologies, in order to reduce the escape of absorbents, an exhaust gas scrubbing section is generally added to the upper part of the absorption tower. By continuously spraying process water onto the packing arranged inside the exhaust gas scrubbing section, part of the absorbent can be recovered. However, studies have shown that due to the high exhaust gas flow rate in the absorption tower, the gas-liquid contact between the exhaust gas carrying the absorbent and the scrubbing water is not very ideal, and the problem of absorbent escape cannot be effectively solved. Although the escape of absorbent can be reduced by adding another layer of packing on top of the packing layer of the existing exhaust gas scrubbing section, the modification space of the existing exhaust gas scrubbing section is limited, the modification is difficult, and the investment cost is greatly increased. In addition, the addition of a layer of packing also increases the resistance of the exhaust gas passing through the exhaust gas scrubbing section, resulting in an increase in the operating cost of the system. Summary of the Invention

[0004] The purpose of the present invention is to overcome the defect of the prior art that the problem of absorbent escape cannot be effectively solved, and to provide a device and method for reducing absorbent escape.

[0005] In order to achieve the above-mentioned objectives, the present invention provides a device for reducing absorbent escape, which includes a wet growth unit and a dry absorption unit arranged in sequence along the direction of flue gas flow, the wet growth unit including a packing layer and an atomizing nozzle arranged above the packing layer, the atomizing nozzle being used to wet the packing layer and form a water vapor supersaturated environment covering the packing layer, the dry absorption unit is filled with alkaline particulate matter, and the alkaline particulate matter is used to absorb the absorbent in the flue gas flowing through the wet growth unit.

[0006] Preferably, the device further comprises a thermal regeneration unit, wherein the thermal regeneration unit is used to regenerate the alkaline particulate matter in the dry absorption unit;

[0007] Preferably, the thermal regeneration unit includes a fluidized bed, a fan and a heat pipe, the fluidized bed has a feed port, a discharge port and an air outlet, the fan is configured to be able to deliver the alkaline particles to be regenerated into the fluidized bed through the feed port, the heat pipe is arranged in the fluidized bed to provide heat for the alkaline particles, the discharge port is for the regenerated alkaline particles to flow out of the fluidized bed, and the air outlet is used to collect the absorbent.

[0008] Preferably, the device also includes a discharging unit and a feeding unit, wherein the discharging unit is arranged between the dry absorption unit and the thermal regeneration unit and is capable of transporting the alkaline particulate matter to be regenerated in the dry absorption unit to the thermal regeneration unit; the feeding unit is arranged between the thermal regeneration unit and the dry absorption unit and is capable of transporting the alkaline particulate matter regenerated in the thermal regeneration unit to the dry absorption unit.

[0009] Preferably, the device further comprises a demisting unit, which is arranged downstream of the dry absorption unit to intercept residual absorbent in the flue gas.

[0010] Preferably, the device includes an absorption tower, the wet growth unit and the dry absorption unit are arranged inside the absorption tower from top to bottom, a flue gas inlet is provided on the side wall of the absorption tower below the wet growth unit, and a flue gas outlet is provided on the top of the absorption tower.

[0011] Preferably, the wet growth unit further includes a circulation pump, a liquid extraction pipe and a reflux pipe; one end of the liquid extraction pipe is connected to the liquid inlet of the circulation pump, and the other end is connected to the bottom of the absorption tower; one end of the reflux pipe is connected to the liquid outlet of the circulation pump, and the other end is connected to the atomizing nozzle.

[0012] Preferably, the dry absorption unit comprises an upper baffle and a lower baffle spaced apart in the vertical direction within the absorption tower, and both the upper baffle and the lower baffle are provided with through holes for the flue gas to pass through;

[0013] Preferably, the lower baffle is obliquely arranged in the absorption tower, and the lower end of the lower baffle is close to the heat regeneration unit;

[0014] Preferably, the upper partition is arranged obliquely in the absorption tower.

[0015] The present invention also provides a method for reducing absorbent escape, the method comprising the following steps:

[0016] S1. Using a wetted packing layer covered in a water vapor supersaturated environment to absorb the absorbent in the flue gas;

[0017] S2. Using alkaline particles to reabsorb the absorbent in the flue gas treated in step S1.

[0018] Preferably, the method is carried out using the above-mentioned device for reducing absorbent escape.

[0019] The present invention also provides a carbon capture system, comprising an absorption system capable of absorbing CO2, and the above-mentioned device for reducing absorbent escape, which is connected to the absorption system and can receive and process the exhaust gas discharged by the absorption system.

[0020] In the technical solution provided by the present invention, the packing layer is wetted by the atomizing nozzle of the wet growth unit and a water vapor supersaturated environment is formed to cover the packing layer. The wetted packing layer can not only intercept and capture absorbents in the form of aerosol particles with smaller particle sizes, but also provide a collision interface to promote water to condense more easily on the surface of the aerosol particles, thereby significantly increasing their particle size. When passing through the dry absorption unit, absorbents in the form of aerosol particles with larger particle sizes are easily absorbed by alkaline particles, thereby effectively reducing the escape of the absorbent.

[0021] Compared with the existing two-step wet method to control the escape of absorbent, the device provided by the present invention reduces the escape of absorbent by first wet method and then dry method, which has the following advantages:

[0022] (1) The device provided by the present invention has a slightly higher absorbent removal rate than the two-step wet process, and has a better level of control over reducing absorbent escape;

[0023] (2) Since the device provided by the present invention has only one-step wet process, compared with the existing two-step wet process, the device provided by the present invention can also significantly save water.

[0024] (3) Compared with the existing two-step wet process, the device provided by the present invention has a significant improvement effect on the water balance problem of the absorption system, which is beneficial to prolonging the service life of the absorbent and the operation cycle of the absorption system, and is beneficial to the operator in operating the absorption system. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is a schematic diagram of a device for reducing absorbent escape in a carbon capture system provided by the present invention;

[0026] Figure 2 yes Figure 1 Enlarged schematic diagram of position A in the middle.

[0027] Description of Reference Numerals

[0028] 100, wet growth unit; 110, packing layer; 120, atomizing nozzle; 130, circulation pump; 131, liquid extraction pipe; 132, reflux pipe; 200, dry absorption unit; 210, upper partition; 220, lower partition; 230, through hole; 300, thermal regeneration unit; 310, fluidized bed; 311, feed port; 312, discharge port; 313, air outlet; 320, fan; 330, heat pipe; 340, regeneration front tank; 350, regeneration rear tank; 400, discharge unit; 500, feed unit; 600, demisting unit; 700, absorption tower; 701, flue gas inlet; 702, flue gas outlet; 703, recovery port; 710, recovery pipe; 711, valve. DETAILED DESCRIPTION

[0029] The following describes the specific embodiments of the present invention in detail with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only used to illustrate and explain the present invention and are not intended to limit the present invention.

[0030] As mentioned above, the present invention provides a device for reducing absorbent escape, which is used to treat tail gas emitted from a carbon capture system to reduce absorbent escape.

[0031] Combine Figure 1 and Figure 2 As shown, the device includes a wet growth unit 100 and a dry absorption unit 200 arranged in sequence along the direction of flue gas flow. The wet growth unit 100 includes a packing layer 110 and an atomizing nozzle 120 arranged above the packing layer 110. The atomizing nozzle 120 is used to wet the packing layer 110 and form a water vapor supersaturated environment covering the packing layer 110. The dry absorption unit 200 is filled with alkaline particulate matter, and the alkaline particulate matter is used to absorb the absorbent in the flue gas flowing through the wet growth unit 100.

[0032] It should be noted that the flue gas in the present invention is the tail gas emitted by the carbon capture system (or absorption system). The absorbent used in the carbon capture system is amine, which usually exists in the tail gas in the form of aerosol particles.

[0033] According to the technical solution provided by the present invention, the filler layer 110 is wetted by the atomizing nozzle 120 of the wet growth unit 100 and a water vapor supersaturated environment is formed to cover the filler layer 110. The wetted filler layer 110 can not only intercept and capture absorbents in the form of aerosol particles with smaller particle sizes, but also provide a collision interface to promote water to condense more easily on the surface of the aerosol particles, thereby significantly increasing their particle size. When passing through the dry absorption unit 200, absorbents in the form of aerosol particles with larger particle sizes are easily absorbed by the alkaline particulate matter, thereby effectively reducing the escape of the absorbent.

[0034] The device provided by the present invention achieves two-step removal of absorbent from flue gas: first, removal by water washing in the wet growth unit 100; and second, absorption by alkaline particulate matter in the dry absorption unit 200. Furthermore, the presence of the wet growth unit 100 effectively increases the particle size of unabsorbed absorbent in the form of aerogel particles, making them more easily absorbed by the dry absorption unit 200. This significantly improves the efficiency of absorbent removal from flue gas and reduces absorbent escape.

[0035] The inventor of this application designed a small test platform, which is designed to process flue gas with a capacity of 3.6 Nm 3 / h, with a designed CO2 capture capacity of 0.84 kg / h, a maximum heating power of 6 kW, and cooling water usage of 125 kg / h. The absorbent flow rate varies with the absorbent type; when using 30wt.% MEA, the absorbent usage is 19.6 kg / h. The system validates design calculations for 30wt.% MEA absorbent and is equipped with flue gas post-treatment devices such as wet / dry / demister, primarily for testing the pollutant emission characteristics of the absorbent.

[0036] In a small-scale test using 30wt.% MEA absorbent, the average amine emission of flue gas after passing through the absorption system was 9.96mg / Nm 3 The average amine emission after one-step wet process was 2.94 mg / Nm 3 The removal rate of the one-step wet process was 70.48%, which clearly shows that the one-step wet process has a poor control effect on amine escape. The average amine emission after the two-step wet process was 0.52 mg / Nm 3 The two-step wet method removal rate was 94.78%, which shows that the two-step wet method can control amine escape to a certain extent.

[0037] The device provided by the present invention is used to treat the above-mentioned flue gas containing escaped amines, and the average amine emission is 0.48 mg / Nm 3 , the removal rate after the dry process was 95.18%. It can be seen from this that the removal rate of the absorbent provided by the device of the present invention is slightly higher than that of the two-step wet process, and has a better level of control and reduction of absorbent escape.

[0038] It should be pointed out that, since the device provided by the present invention has only one-step wet process, compared with the existing two-step wet process, the device provided by the present invention can also significantly save water.

[0039] Furthermore, the inventors of this application have discovered in practice that while existing two-step wet processes can meet the requirements for controlling absorbent escape (also known as amine escape) to a certain extent, wet amine escape control presents the problem of difficult-to-control system water balance, which impacts the absorbent's service life and cycle, and places high demands on operators. Specifically, during wet amine escape control, a large amount of clean water is stored in the water scrubber. This clean water absorbs not only the escaped amine but also water carried in the flue gas, which originates from the absorbent. This causes the clean water level in the water scrubber to continuously rise. After a period of time, the excessively high water scrubber level will be pumped back into the absorption system when the system amine concentration is too high, diluting the excessively concentrated absorbent. However, because the clean water, escaped amine, and flue gas water have already mixed, the absorbent composition after the return pumping is enriched with clean water, disrupting the system's water balance and the absorbent's composition. This reduces the absorbent's performance and lifespan, shortens the system's operating cycle and the absorbent's replacement cycle, increases material investment, and hinders operator operation of the absorption system. In the solution provided by the present invention, which combines the wet growth unit 100 and the dry absorption unit 200, since there is only one wet process, the amount of clean water pumped back into the absorption system is significantly less than that of the two-step wet process. In addition, since the two-step wet process requires the storage of clean water from two water scrubbers, and the clean water after absorbing the escaped amine cannot be effectively recycled, when the concentration of the escaped amine in the clean water is too high, the water balance in the absorption system is difficult to maintain, and it is impossible to pump it back to reduce the liquid level in the water scrubber. Moreover, the high concentration of the escaped amine in the water scrubber will make it impossible to effectively control the amine escape, so that the escaped amine at the flue gas outlet exceeds the emission standard. Therefore, the clean water in the water scrubber must be replaced, which directly reduces the utilization rate of the clean water. The solution provided by the present invention includes the dry absorption unit 200, which does not require the storage of the clean water required for the two-step wet process, but only requires about half the amount of clean water. While improving the removal rate, it greatly reduces the amount of clean water used. The removal rate of the one-step wet process is originally low, and when the amine concentration in the clean water is too high, the removal rate of the one-step wet process will not be excessively reduced.

[0040] The present invention does not impose any special restrictions on the specific type of the alkaline particulate matter. For example, it can be a single alkaline particulate matter, or it can be a mixture of an alkaline material and other materials that are easy to form into granules and not easy to disintegrate. In a specific embodiment of the present invention, the alkaline particulate matter is calcium oxide.

[0041] In the present invention, the type of filler in the filler layer 110 can be the type commonly used in the art, and the present invention will not elaborate on it here.

[0042] In the present invention, the alkaline particulate matter loaded in the dry absorption unit 200 has an absorption upper limit. In order to ensure that the device can operate for a long time, in some embodiments, the device also includes a thermal regeneration unit 300, which is used to regenerate the alkaline particulate matter in the dry absorption unit 200.

[0043] It is understood that in the present invention, the thermal regeneration unit 300 allows the recycling of alkaline particulate matter, significantly reducing the operating costs of the device and reducing material investment. Furthermore, compared to existing two-step wet processes, the present invention utilizes the thermal regeneration unit 300 to completely release the absorbed escaped amine and flue gas-carried water, allowing the complete recovery of the escaped amine. This significantly improves the water balance of the absorption system, significantly delays the performance degradation of the absorbent, and extends the absorbent's service life and renewal cycle, thus facilitating the operation of the absorption system by the operator.

[0044] It should be noted that, in the present invention, the thermal regeneration unit 300 may adopt any appropriate structural form, as long as it can achieve the regeneration of the alkaline particulate matter in the dry absorption unit 200. In some embodiments, the thermal regeneration unit 300 includes a fluidized bed 310, a fan 320, and a heat pipe 330. The fluidized bed 310 has a feed port 311, a discharge port 312, and an air outlet 313. The fan 320 is configured to deliver the alkaline particulate matter to be regenerated into the fluidized bed 310 through the feed port 311. The heat pipe 330 is disposed in the fluidized bed 310 to provide heat to the alkaline particulate matter. The discharge port 312 allows the regenerated alkaline particulate matter to flow out of the fluidized bed 310. The air outlet 313 is used to collect absorbent.

[0045] During actual operation, the alkaline particles that have absorbed the absorbent in the dry absorption unit 200 are blown into the fluidized bed 310 by the fan 320. After being heated by the heat pipe 330, the absorbent in the alkaline particles is released and discharged through the air outlet 313. The regenerated alkaline particles are discharged through the discharge port 312.

[0046] In the present invention, in order to facilitate the realization of automated operation, the device also includes a discharge unit 400 and a feed unit 500. The discharge unit 400 is arranged between the dry absorption unit 200 and the thermal regeneration unit 300 and can transport the alkaline particulate matter to be regenerated in the dry absorption unit 200 to the thermal regeneration unit 300; the feed unit 500 is arranged between the thermal regeneration unit 300 and the dry absorption unit 200 and can transport the alkaline particulate matter regenerated in the thermal regeneration unit 300 to the dry absorption unit 200.

[0047] In the present invention, the discharging unit 400 and the feeding unit 500 may adopt any appropriate structural form as long as they can conveniently transport the alkaline particulate matter. For example, the discharging unit 400 and the feeding unit 500 are screw conveyors respectively.

[0048] Furthermore, in order to ensure the smooth operation of the device, Figure 1 As shown, a pre-regeneration tank 340 is provided between the discharging unit 400 and the thermal regeneration unit 300 for storing the alkaline particulate matter to be regenerated and delivered from the discharging unit 400; a post-regeneration tank 350 is provided between the feeding unit 500 and the thermal regeneration unit 300 for storing the regenerated alkaline particulate matter delivered from the feeding unit 500.

[0049] In some embodiments, the device further includes a demisting unit 600, which is disposed downstream of the dry absorption unit 200 to intercept residual absorbent in the flue gas. It is understood that the provision of the demisting unit 600 can further reduce the escape of the absorbent.

[0050] In the present invention, the demisting unit 600 may adopt any appropriate structural form, as long as it can play the role of intercepting the absorbent in the flue gas. For example, the demisting unit 600 is a wire mesh demister.

[0051] It can be understood that in the device provided by the present invention, the pressure in the absorption tower 700 will fluctuate with the flue gas load, absorbent flow rate, water washing flow rate in the wet growth unit 100 and the performance of the alkaline particulate matter in the dry absorption unit 200. If a wire mesh demister with a fixed thickness is used, the pressure drop of the wire mesh demister will be too large and affect the operation of the tower. Therefore, a wire mesh demister with adjustable thickness is preferred to adapt to different flue gas loads, absorbent flow rates, water washing flow rates in the wet growth unit 100 and the performance of the alkaline particulate matter in the dry absorption unit 200.

[0052] It should be noted that, in the present invention, the device for reducing the escape of the absorbent in the carbon capture system can adopt any appropriate structural form. In some embodiments, the device can be combined with Figure 1 As shown, the device includes an absorption tower 700. The wet growth unit 100 and the dry absorption unit 200 are arranged inside the absorption tower 700 from top to bottom. A flue gas inlet 701 is provided on the side wall of the absorption tower 700 below the wet growth unit 100, and a flue gas outlet 702 is provided at the top of the absorption tower 700. Flue gas containing absorbent from the carbon capture system enters the absorption tower 700 through the flue gas inlet 701, flows through the wet growth unit 100 and the dry absorption unit 200 in sequence, and then flows out through the flue gas outlet 702 at the top of the absorption tower 700.

[0053] It is understandable that in order to facilitate the recovery of the aqueous solution that has absorbed the absorbent in the absorption tower 700 , a recovery port 703 is provided at the bottom of the absorption tower 700 , and the recovery port 703 is connected to a recovery pipe 710 with a valve 711 .

[0054] In some embodiments, the wet growth unit 100 further includes a circulation pump 130, a liquid extraction pipe 131, and a return pipe 132; one end of the liquid extraction pipe 131 is connected to the liquid inlet of the circulation pump 130, and the other end is connected to the bottom of the absorption tower 700; one end of the return pipe 132 is connected to the liquid outlet of the circulation pump 130, and the other end is connected to the atomizing nozzle 120. In the absorption tower 700 provided by the present invention, the aqueous solution sprayed from the atomizing nozzle 120 passes through the packing layer 110 and accumulates at the bottom of the absorption tower 700. By providing the circulation pump 130, this aqueous solution is circulated, thereby effectively reducing water consumption.

[0055] In some embodiments, the dry absorption unit 200 includes an upper baffle 210 and a lower baffle 220 spaced apart in the vertical direction within the absorption tower 700 , and both the upper baffle 210 and the lower baffle 220 are provided with through holes 230 for flue gas to pass through.

[0056] In the present invention, the function of the upper and lower separators 210 and 220 can be understood as confining alkaline particulate matter within a certain range. As the flue gas passes through the upper and lower separators 210 and 220, the alkaline particulate matter trapped between them removes the absorbent. Therefore, the diameter of the through-holes 230 provided in the upper and lower separators 210 and 220 should be smaller than the particle size of the alkaline particulate matter to prevent the alkaline particulate matter from leaking out of the lower separator 220 and from being carried by the flue gas and leaking out of the upper separator 210.

[0057] In some embodiments, the lower baffle 220 is tilted within the absorption tower 700, and the lower end of the lower baffle 220 is close to the thermal regeneration unit 300. It is understood that the above-mentioned structural arrangement not only increases the contact area between the alkaline particulate matter and the flue gas, but also facilitates the transport of the saturated alkaline particulate matter to the thermal regeneration unit 300 for regeneration.

[0058] It should be noted that, in the present invention, if the angle of inclination of the lower baffle 220 relative to the horizontal direction is too large, it is not conducive to evenly distributing the alkaline particles. Instead, the alkaline particles will be concentrated at the lower end of the lower baffle 220, hindering effective contact between the alkaline particles and the absorbent in the flue gas. In some embodiments, the angle of inclination of the lower baffle 220 relative to the horizontal direction is 25°-40°, for example, 30°.

[0059] In some embodiments, the upper baffle 210 is tilted in the absorption tower 700. It is understood that by tilting the upper baffle 210 in the absorption tower 700, the flue gas can pass through the dry absorption unit 200 more easily, reducing the resistance to the passage of the flue gas.

[0060] When the device provided by the present invention is used to reduce the escape of absorbent in a carbon capture system, the flue gas emitted by the carbon capture system is first passed into the absorption tower 700 of the present invention. Water mist is sprayed through the atomizing nozzle 120 to wet the packing layer 110 and form a water vapor supersaturated environment covering the packing layer 110. On the one hand, the absorbent in the flue gas in the form of smaller aerosol particles is intercepted and captured by the packing layer 110. On the other hand, under the cooling effect of the water mist, the moisture in the saturated wet flue gas condenses on the surface of the aerosol particles, causing the particle size of the aerogel particles to increase significantly. At this time, the temperature of the flue gas is reduced from 55°C-60°C at the inlet to 40°C-45°C. When the aerosol particles with increased particle size pass through the dry absorption unit 200, the alkaline particles can easily absorb the aerosol particles with increased particle size. Then, the residual absorbent in the flue gas can be captured by the demisting unit 600, ensuring the control of the escape of the absorbent in the flue gas. Among them, the alkaline particulate matter in the dry absorption unit 200 is transported to the thermal regeneration unit 300 for regeneration treatment after absorbing the saturated absorbent. The fresh alkaline particulate matter after regeneration treatment can be circulated to the dry absorption unit 200 for reuse, and the absorbent separated by thermal regeneration is recycled.

[0061] Another aspect of the present invention provides a method for reducing absorbent escape, the method comprising the steps of:

[0062] S1. Utilizing the wetted filler layer 110 enveloped in a water vapor supersaturated environment to absorb the absorbent in the flue gas;

[0063] S2. Using alkaline particles to reabsorb the absorbent in the flue gas treated in step S1.

[0064] In the method provided by the present invention, by wetting the packing layer 110 and covering it in a water vapor supersaturated environment, the wetted packing layer 110 can not only intercept and capture absorbents in the form of smaller particle sizes in the flue gas in the form of aerosol particles, but also provide a collision interface to promote water to condense more easily on the surface of the aerosol particles, thereby significantly increasing their particle size, and making them easily absorbed by alkaline particulate matter, thereby effectively reducing the absorbent content in the flue gas and reducing the escape of the absorbent.

[0065] Compared with the existing two-step wet process, the method provided by the present invention saves the water consumption of the system while ensuring that the escape of the absorbent is reduced, and has a significant improvement effect on the water balance problem of the absorption system, which is beneficial to extending the service life of the absorbent and the operating cycle of the absorption system, and is beneficial to the operator in operating the absorption system.

[0066] As a preferred solution, the method is carried out using the above-mentioned device for reducing absorbent escape.

[0067] The present invention also provides a carbon capture system, which includes an absorption system capable of absorbing CO2 and the above-mentioned device for reducing absorbent escape, which is connected to the absorption system and can receive and process the exhaust gas discharged by the absorption system.

[0068] The carbon capture system equipped with the device of the present invention can not only effectively reduce the escape of the absorbent, but also significantly save water and significantly improve the water balance problem of the absorption system, which is beneficial to extending the service life of the absorbent and the operating cycle of the system, and is beneficial to the operator in operating the absorption system.

[0069] While the preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings, the present invention is not limited thereto. Within the technical scope of the present invention, various simple variations of the technical solution of the present invention may be made. To avoid unnecessary repetition, the present invention will not further describe various possible combinations. However, these simple variations and combinations should also be considered as disclosed herein and fall within the scope of protection of the present invention.

Claims

1. A device for reducing absorbent escape, characterized in that: The device comprises a wet growth unit (100) and a dry absorption unit (200) sequentially arranged along a flue gas flow direction, the wet growth unit (100) comprising a packing layer (110) and an atomizing nozzle (120) arranged above the packing layer (110), the atomizing nozzle (120) being used to wet the packing layer (110) and form a water vapor supersaturated environment covering the packing layer (110), the dry absorption unit (200) being filled with alkaline particles, the alkaline particles being used to absorb an absorbent in the flue gas flowing through the wet growth unit (100); The device further comprises a heat regeneration unit (300), wherein the heat regeneration unit (300) is used to regenerate the alkaline particulate matter in the dry absorption unit (200); The heat regeneration unit (300) includes a fluidized bed (310), a fan (320) and a heat pipe (330). The fluidized bed (310) has a feed port (311), a discharge port (312) and an air outlet (313). The fan (320) is configured to be able to feed alkaline particles to be regenerated into the fluidized bed (310) through the feed port (311). The heat pipe (330) is arranged in the fluidized bed (310) to provide heat for the alkaline particles. The discharge port (312) allows the regenerated alkaline particles to flow out of the fluidized bed (310). The air outlet (313) is used to collect absorbent.

2. The device for reducing absorbent escape according to claim 1, characterized in that The device further comprises a discharge unit (400) and a feed unit (500), wherein the discharge unit (400) is arranged between the dry absorption unit (200) and the thermal regeneration unit (300) and is capable of transporting the alkaline particulate matter to be regenerated in the dry absorption unit (200) to the thermal regeneration unit (300); and the feed unit (500) is arranged between the thermal regeneration unit (300) and the dry absorption unit (200) and is capable of transporting the alkaline particulate matter regenerated in the thermal regeneration unit (300) to the dry absorption unit (200).

3. The device for reducing absorbent escape according to claim 1, characterized in that The device further comprises a demisting unit (600), wherein the demisting unit (600) is arranged downstream of the dry absorption unit (200) and is used for intercepting residual absorbent in the flue gas.

4. The device for reducing absorbent escape according to any one of claims 1 to 3, characterized in that: The device comprises an absorption tower (700), wherein the wet growth unit (100) and the dry absorption unit (200) are arranged inside the absorption tower (700) from top to bottom, a flue gas inlet (701) is provided on the side wall of the absorption tower (700) below the wet growth unit (100), and a flue gas outlet (702) is provided at the top of the absorption tower (700).

5. The device for reducing absorbent escape according to claim 4, characterized in that The wet growth unit (100) further comprises a circulation pump (130), a liquid extraction pipe (131) and a return pipe (132); one end of the liquid extraction pipe (131) is connected to the liquid inlet of the circulation pump (130), and the other end is connected to the bottom of the absorption tower (700); one end of the return pipe (132) is connected to the liquid outlet of the circulation pump (130), and the other end is connected to the atomizing nozzle (120).

6. The device for reducing absorbent escape according to claim 4, characterized in that The dry absorption unit (200) comprises an upper baffle (210) and a lower baffle (220) spaced apart in an up-down direction within the absorption tower (700), and both the upper baffle (210) and the lower baffle (220) are provided with through holes (230) for flue gas to pass through.

7. The device for reducing absorbent escape according to claim 6, characterized in that The lower baffle (220) is tiltedly disposed in the absorption tower (700), and the lower end of the lower baffle (220) is close to the heat regeneration unit (300).

8. The device for reducing absorbent escape according to claim 6, characterized in that The upper partition (210) is arranged obliquely in the absorption tower (700).

9. A method for reducing absorbent escape, characterized in that The method is carried out using the device for reducing absorbent escape according to any one of claims 1 to 8, and the method comprises the following steps: S1. absorbing an absorbent in the flue gas by using a packing layer (110) that is wetted and enveloped in a water vapor supersaturated environment; S2. Using alkaline particles to reabsorb the absorbent in the flue gas treated in step S1.

10. A carbon capture system comprising an absorption system capable of absorbing CO2, characterized in that: It also comprises a device for reducing absorbent slip according to any one of claims 1 to 8, which is connected to the absorption system and can receive and process tail gas discharged from the absorption system.

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