Carbon capture and amine recovery system and method thereof

Abstract

The application discloses a carbon capture and amine recovery system, which comprises a rough washing tower, an absorption tower, a decarbonization tower and a deaminization tower which are sequentially connected through a pipeline system; the rough washing tower is used for removing pollutants in flue gas, including sulfur oxides, PM particulate matters, hydrogen sulfide and the like; an amine solution spraying module is arranged at the upper portion of the absorption tower, flue gas enters from the lower area of the absorption tower, the amine solution spraying module sprays amine solution to capture carbon dioxide in the flue gas to form a carbon capture solution and decarbonized flue gas; the decarbonization tower is used for receiving the carbon capture solution and processing to obtain high-purity CO2 and a recovery solution; the high-purity CO2 is discharged or reprocessed; the recovery solution is returned to the amine solution spraying module in the upper area of the absorption tower through the pipeline system to realize cyclic utilization; the decarbonized flue gas is transmitted upwards to the deaminization tower and is discharged after deamination. The application realizes three-stage purification flue gas treatment of desulfurization, carbon capture and amine capture recovery through a system, and the whole system has high recovery efficiency.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of greenhouse gas emission reduction of ships, and particularly relates to a carbon capture and amine recovery system. BACKGROUND

[0002] In the existing chemical amine absorption method, amine vapor and its degradation products are usually captured by single-stage or double-stage washing, which leads to high amine concentration in the washing water, poor distribution effect of amine in the gas phase, and a large amount of amine being taken away with the exhaust gas flow and fine droplets and released into the atmosphere. In addition, the existing design generally adopts the design of integrating the absorption tower and the water washing tower, which leads to the whole tower being too high, which is not conducive to installation and transportation. SUMMARY

[0003] The present application aims to overcome at least one of the above-mentioned defects of the prior art, and provides a carbon capture and amine recovery system to realize three-stage efficient purification of flue gas in engine flue gas desulfurization, carbon capture and amine capture recovery.

[0004] Specifically, the present application provides a carbon capture and amine recovery system, comprising a rough washing tower, an absorption tower, a decarbonization tower and a deamination tower connected in sequence through a pipeline system.

[0005] The rough washing tower is used to remove pollutants in the flue gas, including but not limited to sulfur oxides, PM particulate matter and hydrogen sulfide.

[0006] The upper part of the absorption tower is provided with an amine solution spraying module, and the flue gas enters from the lower area of the absorption tower. The amine solution spraying module sprays amine solution to capture carbon dioxide in the flue gas to form a carbon capture solution and decarbonized flue gas.

[0007] The decarbonization tower is used to receive the carbon capture solution and obtain high-purity CO2 and a recovery solution by processing; the high-purity CO2 is discharged or reprocessed; and the recovery solution is returned to the amine solution spraying module at the top of the absorption tower through the pipeline system to realize cyclic utilization.

[0008] The decarbonized flue gas is transmitted upward to the deamination tower and discharged after deamination.

[0009] The carbon capture and amine recovery system of the present application can realize three-stage purification of flue gas in the engine, including desulfurization, carbon capture and amine capture and recovery. First, the flue gas generated in the engine is treated by the rough washing tower to remove pollutants such as sulfur oxides, PM particulate matter and hydrogen sulfide. A cooling pipe is installed above the rough washing tower for spray cooling of the flue gas. A rough filter device is provided at the top of the rough washing tower for rough filtration of the flue gas. A wastewater collection pipeline is provided at the bottom of the rough washing tower. The top of the rough washing tower is connected to the middle and lower part of the absorption tower. A booster fan is also provided between the two pipelines to increase the flow rate of the flue gas. A liquid level monitor, a temperature detector and a pH detector are installed in the absorption tower to detect the level of the liquid, the temperature in the tower and the concentration of the amine solution according to the pH value to supplement in time.

[0010] The deamination tower includes a top region, an upper region and a lower region. The deamination tower reduces amine emissions and improves amine recovery efficiency through circulating water washing, cyclone demisting and chemical agent circulating water washing, including the following steps:

[0011] S31: A circulating water washing module is provided in the lower region of the deamination tower. The circulating water washing module contains a water tank. The amine vapor in the flue gas is recovered by circulating water washing. The circulating water absorbs the amine vapor and is collected in the water tank. After this step, the amine content in the flue gas is T1;

[0012] S32: A cyclone demister is provided in the top region of the deamination tower to remove residual ammonia vapor and aerosol in the flue gas for recovery. After this step, the amine content in the flue gas is T2;

[0013] S33: A chemical agent tank is provided in the circulating water washing module. Chemical agents are added to the circulating water washing module to enhance the capture ability of amine substances during spraying, so that the content of amine substances is further reduced. After this step, the amine content in the flue gas is T3;

[0014] An amine concentration tester is provided on the top discharge pipe of the deamination tower. When the amine concentration tester detects that T2 is higher than the set threshold P1 after the S31 and S32 steps, the S33 step is started;

[0015] The following steps are also included:

[0016] S34: A circulating acid washing module is provided in the upper region of the deamination tower. Circulating spray of acid solution is performed for fine washing to further remove amine vapor and aerosol in the flue gas. After this step, the amine content in the flue gas is T4;

[0017] When the amine concentration tester detects that T3 is higher than the set threshold P2, the circulating acid washing module is started;

[0018] Wherein T4≤T3≤T2≤T1, and P2≤P1.

[0019] The bottom of the water tank is connected to the upper part of the absorption tower through a discharge pipe. The circulating water of the circulating water washing module is alkaline after absorbing amine, and the pH value becomes larger. The pH value of the circulating water in the circulating water washing module is detected in the water tank. When the pH value is higher than a set threshold M1, the circulating water is discharged into the absorption tower through the discharge pipe at the bottom of the water tank or flows to the amine solution spraying module in the upper area of the absorption tower to be recovered as amine solution for spraying to capture carbon dioxide.

[0020] The bottom of the absorption tower is connected to the middle part of the decarbonization tower through a pipeline system for transmitting the carbon capture solution enriched with carbon dioxide into the decarbonization tower. The decarbonization tower is also provided with detection instruments such as liquid level monitor, temperature detector, and pH detector for real-time detection of relevant indicators in the tower. The carbon capture solution is separated in the decarbonization tower to form high-purity CO2 and recovery solution. The high-purity CO2 is transmitted upward for recovery or discharge. The recovery solution is returned to the absorption tower through the pipeline system at the bottom of the decarbonization tower. Pumps are installed in the pipeline between the absorption tower and the decarbonization tower for liquid transmission.

[0021] On the other hand, the flue gas after decarbonization is further transmitted upward from the absorption tower to the deamination tower. After deamination in the deamination tower, the amine concentration is finally measured to meet the standard and can be discharged. The deamination tower is also provided with a pH detector, a liquid level sensor, etc. for real-time detection of indicators in the tower. A pipeline system connected to the top outlet of the deamination tower is also provided with an amine concentration tester. After the flue gas is detected to meet the amine concentration, it is discharged to the discharge port by a one-way valve. The amine concentration tester measures the amine vapor concentration by a Fourier transform infrared spectrometer.

[0022] Further, the present application mainly realizes deamination by water washing. The carbon capture and amine recovery system of the present application further comprises a circulating water washing module, which comprises a water tank, a first spraying assembly, a first pipeline, and a second pipeline. The water tank is installed below the deamination tower. The first spraying assembly is arranged in the deamination tower. The bottom of the water tank is connected to the first spraying assembly through the first pipeline. The top of the water tank is connected to the bottom of the deamination tower through the second pipeline. The circulating water is pumped from the water tank to the first spraying assembly for spraying. The backflow water after spraying is backflowed to the top of the water tank through the pipeline system and then flows into the water tank, realizing water circulation. The circulating water is sprayed downward and upward to the upward moving decarbonized flue gas in the deamination tower to recover the amine vapor in the flue gas. Since the water in the water tank is lost during the circulation process, a water supplement pipe is designed above the water tank. A liquid level sensor is arranged in the water tank. When the liquid level is detected to be lower than a threshold value, the water supplement pipe can be opened to supplement water. The bottom of the water tank is connected to the upper part of the absorption tower through the pipeline system. The pH value of the circulating water in the water tank is detected. When the pH value is higher than a set threshold value, the circulating water is discharged into the absorption tower through the bottom discharge pipe or flows to the amine solution spraying module in the upper region of the absorption tower to be recovered as amine solution for spraying to capture carbon dioxide. Typically, the washing water becomes alkaline after absorbing amine, and the pH value becomes larger. Therefore, the pH threshold value can be set to control the alkalinity of the washing water. When the threshold value is triggered, the washing water is discharged into the absorption tower.

[0023] Further, the carbon capture and amine recovery system of the present application further comprises a heat exchanger and a medicament tank. The heat exchanger is connected to the first pipeline. The medicament tank is connected to the second pipeline. The heat exchanger is used to cool the first pipeline to reduce steam generation. The medicament tank is used to capture amine impurities in the backflow water. The medicament in the medicament tank includes substances that can react with amine compounds to enhance the capture effect of amine impurities, such as amine, ammonia, aldehyde, and carbonic acid impurities, so as to further reduce the content of these substances. A control valve is arranged below the medicament tank to remotely control the release of the medicament. The water tank is also provided with a pH detector to detect whether the water in the water tank meets the requirements through the pH value. For example, when the amine concentration is detected to be too high in the deamination tower through the pH value, the valve of the medicament tank can be controlled to increase the dosage of the medicament to improve the removal efficiency of amine compounds. Typical medicaments include sodium hydroxide, potassium hydroxide, ion exchange resin, surfactant, acetone solvent, and methanol solvent. After the circulating water washing with the medicament, the content of amine substances in the flue gas can be reduced to 1 ppm or below.

[0024] Further, the carbon capture and amine recovery system also comprises a circulating acid washing module; the circulating acid washing module comprises a third pipeline, an acid tank, a fourth pipeline and a second spraying assembly connected in sequence; the deamination tower comprises a top region, an upper region and a lower region; the first spraying assembly is installed in the lower region; the second spraying assembly is installed in the upper region; one end of the third pipeline is connected to the lower part of the upper region, and the other end is connected to the upper part of the acid tank; one end of the fourth pipeline is connected to the lower part of the acid tank, and the other end is connected to the second spraying assembly.

[0025] The deamination of the present application adopts a two-stage washing mode. After decarbonization, the flue gas enters the lower region of the deamination tower, is subjected to primary water washing by circulating water spraying, and then continues to enter the upper region upward, is subjected to secondary washing by circulating acid spraying, so that amine vapor can be basically recovered; and the fine washing by spraying acid solution can further remove amine vapor and aerosol in the flue gas.

[0026] Further, the first pipeline is provided with a first pump, and the fourth pipeline is provided with a second pump.

[0027] Further, the top of the absorption tower is provided with a primary demister; the primary demister is used for removing amine vapor and particulate matter; the primary demister is composed of multiple layers of honeycomb-shaped hole plates staggered and stacked, and when amine vapor passes through, it will condense into liquid, and at the same time, it can also prevent larger particulate matter from passing through.

[0028] Further, the cyclone demister comprises a support, a baffle, a side wall, a recovery pipe and one or more cyclones; the cyclone is installed on the central axis of the support; the side wall is arranged on the cyclone; the side wall is provided with multiple through holes on both sides, and both ends of the side wall are fixed with the inner wall of the support; the baffle is a conical mesh, the top is connected with the top inner wall of the support, and the side is connected with the side wall of the support; the two sides of the side wall and the support form a collection groove, and the recovery pipe is connected with the collection groove. According to the concentration of flue gas, a single cyclone or multiple cyclones can be started, which can be controlled remotely.

[0029] Another inventive point of the present application is that the deamination efficiency is higher and the effect is better by adopting the secondary demisting method. First, a primary demister is arranged at the top of the absorption tower to preliminarily remove most of the amine steam and larger particles in the emission. Further secondary demisting is realized by the cyclone demister in the deamination tower. That is, the flue gas after the first demisting flows from bottom to top through the cyclone demister, the cyclone is rotated and disturbed, and the flue gas is accelerated in the cyclone motion. The micron-sized droplets carried by the flue gas pass through the side wall horizontally. The side wall of the present application has a plurality of through holes to facilitate the passage of droplets and flue gas. The micron-sized droplets are then vertically thrown to the baffle. The baffle is a conical mesh. The small liquid condenses on the baffle to form larger droplets, which then gravitate to the collection tank at the edge of the deamination tower. The recovery pipe is installed at the bottom of the collection tank for recycling. The clean flue gas after deamination passes through the mesh of the baffle and is discharged upward. The amine emission is reduced and the amine recovery efficiency is improved by circulating water washing, cyclone demisting and dosing agent circulating water washing in the deamination tower.

[0030] Further, the decarbonization tower is also provided with an additive cabinet, which contains one or more of oxalic acid, citric acid, acetic acid and ion exchange resin; for improving the carbon dioxide desorption rate. It also includes a CO2 treatment module and an exhaust port. The CO2 treatment module is connected to the top of the decarbonization tower through a pipeline system, which can collect high-purity CO2. The exhaust port is connected to the top of the deamination tower, and the exhaust port and the CO2 treatment module are in communication through a pipeline system. The captured CO2 can be collected and treated by the CO2 treatment module, or can be discharged through the exhaust port. In addition, for flue gas with amine concentration meeting the standard, it can finally be discharged through the exhaust port.

[0031] The present application also provides a carbon capture and amine recovery method using the carbon capture and amine recovery system of the present application, comprising the following steps:

[0032] S1: rough treatment of flue gas: the flue gas generated in the engine is treated by a rough washing tower to remove sulfur oxides, PM particles and hydrogen sulfide pollutants therein;

[0033] S2: carbon capture: the flue gas treated in step S1 enters the bottom of the absorption tower, and the amine solution is sprayed from the top of the absorption tower downward to capture carbon dioxide in the flue gas to form a carbon capture solution. The carbon capture solution is further transported to the decarbonization tower to form a recovery solution and high-purity CO2. The high-purity CO2 is transported to the CO2 treatment module for recovery and storage, and the recovery solution is returned to the top of the absorption tower for spraying to realize a spraying cycle;

[0034] S3: amine recovery: the flue gas treated in step S2 is discharged from the top of the absorption tower to realize primary demisting, and then enters the deamination tower for circulating water washing, circulating acid washing and secondary demisting by the cyclone demister before being discharged.

[0035] Further, in step S3,

[0036] The method of circulating water washing is that water in the water tank is pumped into the first spraying assembly to spray the lower area of the deaminating tower, and the backflow water is backflowed to the water tank through the pipeline system, so that the circulating water washing of the flue gas entering the deaminating tower is realized, and the concentration of amine substances in the flue gas is reduced.

[0037] The method of circulating acid washing is that acid liquid in the acid tank is pumped into the second spraying assembly to spray the upper area of the deaminating tower, and the backflow acid is backflowed to the acid tank through the pipeline system, so that the circulating acid washing of the flue gas entering the deaminating tower is realized, and the concentration of amine substances in the flue gas is reduced; the acid tank can be sulfuric acid, hydrochloric acid, phosphoric acid, acetic acid, citric acid and the like.

[0038] The method of secondary demisting is that the flue gas flows from bottom to top through the cyclone demister, the cyclone is rotated and disturbed, the flue gas is accelerated in the cyclone motion, the micron-sized liquid droplets carried are first horizontally passed through the through holes on the side wall, and then vertically thrown to the conical net-shaped baffle, the micron-sized liquid droplets are condensed on the baffle to form larger liquid droplets, and then the larger liquid droplets are gravity settled into the collecting groove, and are recycled through the recycling pipe, and the clean flue gas after deamination is discharged upwards through the mesh of the baffle.

[0039] Compared with the prior art, the beneficial effects of the present application are:

[0040] The present application separates the absorption tower and the deaminating tower which can realize water washing, so that transportation and flexible installation are facilitated.

[0041] The present application realizes three-stage purification flue gas treatment of desulfurization, carbon capture and amine capture and recovery through a set of system, so that the flue gas meets the environmental protection standard, the whole system has reasonable structure design, can realize the lowest energy consumption and the highest recovery efficiency.

[0042] In the amine capture stage, the present application reduces the emission of amine in the chemical amine absorption method through the secondary washing method and the secondary demisting, improves the recovery efficiency of amine, and reduces environmental pollution to further reduce the content of amine.

[0043] Meanwhile, the secondary demisting in the present application adopts the cyclone demisting mode, the cyclone demisting efficiency is higher than that of the primary demisting, the flue gas is rotated at high speed to form micron-sized liquid droplets, the micron-sized liquid droplets are condensed to form larger liquid droplets through two times of turning, and then the larger liquid droplets are gravity settled into the collecting groove at the edge of the deaminating tower, and the demisting effect is also good.

[0044] The present application is provided with pH value monitoring and amine concentration detection in the absorption tower, the de-carbon tower and the deaminating tower, so that real-time monitoring during system operation can be realized.

[0045] The present application also designs a CO2 treatment module, the desorbed carbon dioxide enters the CO2 treatment module through the carbon dioxide pipe, and can also be directly discharged through the communication pipe, and different treatment modes can be selected according to actual needs. BRIEF DESCRIPTION OF DRAWINGS

[0046] Figure 1 A schematic diagram of a carbon capture and amine recovery system of the present invention.

[0047] Figure 2 A schematic diagram of a cyclone mist eliminator of the present invention. DETAILED DESCRIPTION

[0048] The accompanying drawings are used to more clearly describe the technical solutions in the embodiments of the present application. In the drawings, identical or similar reference numerals refer to identical or similar elements or elements having identical or similar functions throughout. The described embodiments are part of the embodiments of the present application, rather than all the embodiments. The embodiments described below with reference to the drawings are exemplary and are intended to explain the present application, and cannot be understood as a limitation of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of protection of the present application. The embodiments of the present application are described in detail below with reference to the drawings.

[0049] It should be noted that if the present application has directionality indication (such as up, down, left, right, front, back, etc.) in the embodiments, the directionality indication is only used to explain the relative position relationship, movement condition, etc. between components in a certain posture (as shown in the drawings), if the certain posture changes, the directionality indication also changes accordingly.

[0050] In addition, if the present application has descriptions of "first", "second", etc. in the embodiments, the "first", "second", etc. descriptions are only for description purposes, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" can explicitly or implicitly include at least one of the features. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the realization of those of ordinary skill in the art, when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, nor within the scope of protection claimed by the present application. EMBODIMENTS

[0051] As Figure 1As shown, a carbon capture and amine recovery system and method for processing flue gas generated by an engine 100. It comprises a rough washing tower 101, an absorption tower 102, a decarbonization tower 103, and a deamination tower 104 connected in sequence by a pipeline system. First, the flue gas generated by the engine is processed by the rough washing tower 101 to remove pollutants such as sulfur oxides, PM particulate matter, and hydrogen sulfide. A cooling pipe 10 is installed above the rough washing tower 101 for spray cooling of the flue gas. A rough filter device is provided at the top of the rough washing tower 101 to achieve rough filtration of the flue gas. A wastewater collection pipeline 20 is provided at the bottom of the rough washing tower 101. The top of the rough washing tower 101 is connected to the middle and lower part of the absorption tower 102. A booster fan 105 is also provided between the pipelines of the two towers to increase the flow rate of the flue gas.

[0052] A liquid level monitor, a temperature detector, and a pH detector are installed in the absorption tower 102 to detect the level of the liquid, the temperature inside the tower, and the concentration of the amine solution based on the pH value for timely replenishment. A first mist eliminator 211 is provided at the top of the absorption tower 102 to preliminarily remove most of the amine vapor and larger particles in the flue gas. The flue gas after decarbonization and first mist removal is discharged from the top of the absorption tower 102 to the deamination tower 104.

[0053] The bottom of the absorption tower 102 is connected to the middle of the decarbonization tower 103 by a pipeline system to transfer the carbon capture solution enriched with carbon dioxide to the decarbonization tower 103. The decarbonization tower 103 is also equipped with liquid level monitors, temperature detectors, and pH detectors for real-time detection of relevant indicators inside the tower. An additive cabinet 106 is connected to the upper part of the decarbonization tower 103, which contains oxalic acid to increase the desorption rate of carbon dioxide. In other embodiments of the invention, the additive cabinet contains a mixture of one or more of oxalic acid, citric acid, acetic acid, and ion exchange resin. The carbon capture solution is separated in the decarbonization tower 103 to form high-purity CO2 and a recovery solution. The high-purity CO2 is transmitted upward to a CO2 processing module 400 for recovery. An amine concentration tester is also provided on the transmission pipeline system to monitor whether the gas at the discharge port meets the standards in real time. Alternatively, it can be directly discharged to a discharge port 300. The recovery solution is returned to the absorption tower 102 through the bottom of the decarbonization tower 103 by a pipeline system. Pumps are installed on the pipelines between the absorption tower 102 and the decarbonization tower 103 for liquid transmission.

[0054] On the other hand, the flue gas after decarburization and primary demisting is further transported upward by the absorption tower 102 to the amine removal tower 104, and after the amine concentration is finally measured to meet the standard, it can be discharged. The amine removal tower 104 is also provided with a pH detector, a liquid level sensor and the like for real-time detection of the indicators in the tower. And the pipeline system connected to the top outlet of the amine removal tower 104 is also provided with an amine concentration tester 107. After the flue gas is detected to be qualified in amine concentration, it is discharged to the discharge port 300 by a one-way valve. The amine concentration tester 107 measures the amine vapor concentration by a Fourier transform infrared spectrometer.

[0055] The specific amine removal process includes secondary washing and secondary demisting process. The amine removal tower 104 includes a top region, an upper region and a lower region. The lower region is provided with a circulating water washing module, including a water tank 108, a first spraying assembly 109, a first pipeline 30, a second pipeline 40, a heat exchanger 110 and a medicament tank 111. The water tank 108 is installed below the amine removal tower 104. The first spraying assembly 109 is arranged in the amine removal tower 104. The bottom of the water tank 108 is connected to the first spraying assembly 109 through the first pipeline 30. The top of the water tank 108 is connected to the bottom of the amine removal tower 104 through the second pipeline 40. The circulating water is pumped from the water tank 108 to the first spraying assembly 109 for spraying. The backflow water after spraying flows back to the top of the water tank 108 and then flows into the water tank 108, realizing water circulation. The circulating water is sprayed downward and moves upward to recover the amine vapor in the flue gas. Since the water in the water tank 108 is lost during circulation, the present application designs a water supplement pipe 50 above the water tank 108. The water tank 108 is provided with a liquid level sensor and the like. When the liquid level is detected to be lower than the threshold value, the water supplement pipe 50 can be opened for replenishment. The bottom of the water tank is connected to the upper part of the absorption tower through a discharge pipe. The pH value of the circulating water in the water tank is detected. When the pH value is higher than the set threshold value, the circulating water is discharged into the absorption tower through the bottom discharge pipe or flows to the amine solution spraying module in the upper region of the absorption tower to be recovered as amine solution for spraying to absorb carbon dioxide. Typically, the washing water becomes alkaline after absorbing amine, and the pH value becomes larger. Therefore, the pH threshold value can be set to control the alkalinity of the washing water. When the threshold value is triggered, the washing water is discharged into the absorption tower.

[0056] The heat exchanger 110 is connected with the first pipeline 30; the first pipeline 30 is provided with a first pump 112; the medicament cabinet 111 is connected with the second pipeline 40; the heat exchanger 110 is used for cooling the first pipeline 30 to reduce steam generation; the medicament cabinet 111 is used for enhancing the capturing capacity of the spray to the amine substances, such as amine, ammonia, aldehyde, carbonic acid impurities, by adding medicaments into the circulating acid washing module to further reduce the content of the substances. The upper area is provided with a circulating acid washing module; the circulating acid washing module comprises a third pipeline 60, an acid cabinet 113, a fourth pipeline 70 and a second spray assembly 114 connected in sequence; the second spray assembly 114 is installed in the upper area; one end of the third pipeline 60 is connected with the lower part of the upper area, and the other end is connected with the upper part of the acid cabinet 113; one end of the fourth pipeline 70 is connected with the lower part of the acid cabinet 113, and the other end is connected with the second spray assembly 114. The fourth pipeline 70 is provided with a second pump 115. The acid cabinet can be sulfuric acid, hydrochloric acid, phosphoric acid, acetic acid, citric acid and the like.

[0057] The flue gas after the first-stage defogging and the second-stage washing is subjected to the second-stage defogging through the cyclone defogging device 200. The cyclone defogging device 200 comprises a baffle 201, a side wall 202, a recovery pipe 80, one or more cyclones 203 and a support 204. The cyclone 203 is installed on the central axis of the support 204. The side wall 202 is arranged on the cyclone 203. The side wall 202 is provided with a plurality of through holes on both sides. The side wall 202 is fixed to the inner wall of the support 204 at both ends. The baffle 201 is a conical mesh and has mesh holes for allowing the flue gas to pass through. The top of the baffle 201 is connected to the inner wall of the top of the support 204. The side edge of the baffle 201 is connected to the side wall 202 of the support 204. The side wall 202 and the support 204 form a collecting groove between both sides. The recovery pipe 80 is connected to the collecting groove. That is, the flue gas after the first-stage defogging flows from bottom to top through the cyclone defogging device 200. The cyclone 203 rotates and disturbs the flue gas. The flue gas is accelerated in the cyclone motion. The micron-sized liquid droplets carried by the flue gas pass through the side wall 202 horizontally. The side wall 202 of the present application has a plurality of through holes to facilitate the passage of the liquid droplets and the flue gas. The micron-sized liquid droplets are thrown vertically to the baffle 201. The baffle 201 is a conical mesh. The small liquid droplets condense on the baffle 201 to form larger liquid droplets. The larger liquid droplets are subjected to gravity settling in the collecting groove at the edge of the amine removal tower 104. The recovery pipe 80 installed at the bottom of the collecting groove is used for recovery treatment. The clean flue gas after the amine removal passes through the amine concentration tester 107 upward. The flue gas is discharged from the discharge port 300 after the detection reaches the standard. The discharge port 300 is connected to the top of the amine removal tower 104. The discharge port 300 and the CO2 treatment module 400 are communicated through the pipeline system. The captured CO2 can be collected and treated through the CO2 treatment module 400 or discharged through the discharge port 300. In addition, the flue gas with the amine concentration reaching the standard can be finally discharged through the discharge port 300.

[0058] Thus, the amine emission can be reduced, the amine recovery efficiency can be improved, and the amine concentration in the flue gas can be further reduced when the concentration detected by the amine concentration tester is higher than the set threshold by the circulating water washing, the cyclone demisting and the additive circulating water washing in the deamination tower.

[0059] Typical additives include sodium hydroxide, potassium hydroxide, ion exchange resin, surfactant, acetone solvent, methanol solvent, etc. The additive cabinet contains one or more of oxalic acid, citric acid, acetic acid, and ion exchange resin.

[0060] The above embodiments are only used to illustrate the technical solutions of the present application and not limit the present application. Although the present application has been described in detail with reference to the above preferred embodiments, those skilled in the art should understand that the technical solutions of the present application can be modified or replaced by equivalents without departing from the spirit and scope of the present application. Those skilled in the art can also make other changes within the spirit of the present application and use them in the design of the present application, as long as they do not deviate from the technical effects of the present application. These changes made in accordance with the spirit of the present application should be included in the scope of the present application.

Claims

1. A carbon capture and amine recovery system, characterized by, The crude washing tower (101), the absorption tower (102), the decarbonization tower (103), and the deaminization tower (104) are sequentially connected through a pipeline system; The crude washing tower (101) is used for removing pollutants in the flue gas, including sulfur oxides, PM particulate matter, and hydrogen sulfide; The upper region of the absorption tower (102) is provided with an amine solution spraying module, the flue gas enters from the lower region of the absorption tower (102), and the amine solution spraying module captures carbon dioxide in the flue gas by spraying amine solution to form a carbon capture solution; The decarbonization tower (103) is used for receiving the carbon capture solution and processing to obtain high-purity CO2 and a recovery solution; the high-purity CO2 is discharged or reprocessed; and the recovery solution is returned to the amine solution spraying module at the top of the absorption tower (102) through a pipeline system to realize cyclic utilization; The decarbonization flue gas is transmitted upward to the deaminization tower (104) and is discharged after deaminization; The deaminization tower (104) includes a top region, an upper region, and a lower region, and the amine emission is reduced and the amine recovery efficiency is improved in the deaminization tower by circulating water washing, cyclone demisting, and dosing agent circulating water washing, including the following steps: S31: A circulating water washing module is arranged in the lower region of the deaminization tower, the circulating water washing module includes a water tank (108), the amine vapor in the flue gas is recovered by circulating water washing, the circulating water that has absorbed the amine vapor is collected in the water tank (108), and the amine content concentration in the flue gas is T1 after the step; S32: A cyclone demister (200) is arranged in the top region of the deaminization tower, the amine vapor and aerosol remaining in the flue gas are removed and recovered, and the amine content concentration in the flue gas is T2 after the step; S33: A medicament tank (111) is arranged in the circulating water washing module, a medicament is added in the circulating water washing module to enhance the capturing capacity of amine substances during spraying, so that the amine substance content is further reduced, and the amine content concentration in the flue gas is T3 after the step; An amine concentration tester (107) is arranged on the top discharge pipe of the deaminization tower (104), and when T2 is higher than a set threshold P1 detected by the amine concentration tester (107) after the steps S31 and S32, the step S33 is started; Further comprising the following steps: S34: A circulating acid washing module is arranged in the upper region of the deaminization tower, and an acid solution is sprayed for fine washing to further remove the amine vapor and aerosol in the flue gas, and the amine content concentration in the flue gas is T4 after the step; When T3 is higher than a set threshold P2 detected by the amine concentration tester (107), the circulating acid washing module is started; Wherein T4≤T3≤T2≤T1, and P2≤P1; The cyclone demister includes a support (204), a baffle (201), a side wall (202), a recovery pipe (80), and one or more cyclones (203); The cyclone (203) is installed on the central axis of the support (204); The side wall (202) is arranged on the cyclone (203); both sides of the side wall (202) are provided with a plurality of through holes, and both ends of the side wall (202) are fixed with the inner wall of the support (204); The baffle (201) is a conical net, the top of which is connected with the inner wall of the top of the support (204), and the side is connected with the side wall (202) of the support (204). The two sides of the side wall (202) and the support (204) form a collecting groove, and the recovery pipe (80) is connected with the collecting groove.

2. The carbon capture and amine recovery system of claim 1, wherein, The bottom of the water tank (108) is connected with the upper part of the absorption tower (102) through a discharge pipe, the circulating water in the circulating water washing module is alkaline after absorbing amine, the pH value is large, the pH value of the circulating water in the circulating water washing module is detected in the water tank, when the pH value is higher than a set threshold M1, the circulating water is discharged into the absorption tower through the discharge pipe at the bottom of the water tank or flows to the amine solution spraying module in the upper area of the absorption tower to be recovered as amine solution for spraying to capture carbon dioxide.

3. The carbon capture and amine recovery system of claim 1, wherein, The circulating water washing module comprises a water tank (108), a first spraying assembly (109), a first pipeline (30) and a second pipeline (40); the water tank (108) is installed below the deamination tower (104); the first spraying assembly (109) is arranged in the deamination tower (104); The bottom of the water tank (108) is connected with the first spraying assembly (109) through the first pipeline (30); the top of the water tank (108) is connected with the bottom of the deamination tower (104) through the second pipeline (40); The circulating water is pumped from the water tank (108) to the first spraying assembly (109) for spraying, the backflow water after spraying is backflowed to the top of the water tank (108) through the pipeline system and flows into the water tank (108), so that water circulation is realized, and the circulating water is sprayed downward and upward to the upward moving decarbonized flue gas in the deamination tower to realize reverse operation to recover amine vapor in the flue gas.

4. The carbon capture and amine recovery system of claim 1, wherein, A heat exchanger (110) is further included; the heat exchanger (110) is connected with the first pipeline (30); a medicament tank (111) is connected with the second pipeline (40); The heat exchanger (110) is used for cooling the first pipeline (30); the medicament tank (111) is used for adding medicaments in the circulating water washing module to enhance the capturing capacity of amine substances during spraying, including amine, ammonia, aldehyde and carbonic acid impurities, so that the content of the impurities is further reduced.

5. The carbon capture and amine recovery system of claim 3, wherein, The circulating acid washing module comprises a third pipeline (60), an acid tank (113), a fourth pipeline (70) and a second spraying assembly (114) connected in sequence; The first spraying assembly (109) is installed in the lower area of the deamination tower (104); the second spraying assembly (114) is installed in the upper area of the deamination tower (104); One end of the third pipeline (60) is connected with the lower part of the upper area, and the other end is connected with the upper part of the acid tank (113); One end of the fourth pipeline (70) is connected with the lower part of the acid tank (113), and the other end is connected with the second spraying assembly (114); A first pump (112) is arranged on the first pipeline (30), and a second pump (115) is arranged on the fourth pipeline (70).

6. The carbon capture and amine recovery system of claim 1, wherein, The top of the absorption tower (102) is provided with a primary mist eliminator (211) which is composed of multiple layers of honeycomb-like orifice plates staggered and superimposed, and when amine vapor passes through, it will condense into liquid, while also preventing larger particles from passing through.

7. A carbon capture and amine recovery process characterized by: The carbon capture and amine recovery system of any one of claims 2-6; The working method of the circulating water washing module is that the water in the water tank (108) is pumped into the first spray assembly (109) by the first pump (112) to spray the lower area of the deaminating tower (104), and the backflow water is backflowed to the water tank (108) through the pipeline system, so that the circulating water washing of the flue gas entering the deaminating tower is realized, and the concentration of amine substances in the flue gas is reduced; The working method of the circulating acid washing module is that the acid liquid in the acid tank (113) is pumped into the second spray assembly (114) by the second pump (115) to spray the upper area of the deaminating tower (104), and the backflow acid is backflowed to the acid tank (113) through the pipeline system, so that the circulating acid washing of the flue gas entering the deaminating tower is realized, and the concentration of amine substances in the flue gas is reduced; The working method of the cyclone mist eliminator is that the flue gas flows from bottom to top through the cyclone mist eliminator, wherein the cyclone (203) rotates and disturbs, the flue gas accelerates in the cyclone motion, the micron-sized droplets carried by the flue gas first pass through the through holes on the side wall (202) horizontally, and then are thrown vertically to the conical mesh-shaped baffle (201), the micron-sized droplets condense to form larger droplets on the baffle (201) and then gravity settle into the collection tank, and are recycled through the recycling pipe (80), and the clean flue gas after deamination passes through the mesh of the baffle (201) and is discharged upward.

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