A device system and method for preventing amine escape in a carbon dioxide amine capture process

Abstract

The present invention provides a device system and method for preventing amines from escaping in a carbon dioxide amine capture process, wherein the device system comprises an absorption tower system, an amine liquid system and a desorption tower system connected in sequence; a tube bundle droplet removal device is arranged on the upper part of the absorption tower system. The device system has a simple structure and is easy to operate and control. The method of the present invention adopts a tube bundle droplet removal device to remove amine droplets carried in the exhaust airflow of the absorption tower, thereby preventing environmental pollution and a large amount of amine liquid loss; the method has low processing cost, high removal efficiency of amine droplets in the airflow, and good economic and environmental benefits.

Description

Technical Field

[0001] The invention relates to the technical field of energy conservation and environmental protection, and in particular to a device system and method for preventing amine from escaping during a carbon dioxide amine capture process. Background Art

[0002] CCUS (Carbon Capture, Utilization and Storage) is an indispensable technical direction for carbon reduction. CCUS is also an important way to achieve deep emission reductions of fossil energy.

[0003] At present, carbon dioxide capture technology is mainly used in thermal power plants, cement, steel, chemical industry and other industries that emit a lot of carbon dioxide. Carbon dioxide capture technology mainly includes chemical absorption, physical membrane separation and adsorption. Compared with physical membrane separation and adsorption, chemical absorption is more mature and has a higher capture purity, reaching about 97% to 99%. Chemical amine absorption is mostly used in industry to capture carbon dioxide.

[0004] However, the flue gas discharged during the process of capturing carbon dioxide by chemical amine absorption will contain amine droplets, resulting in amine escape. When the amine droplets are discharged into the environment, aerosols will be generated, causing environmental pollution and a large amount of amine loss.

[0005] Experts and scholars have conducted research on the problem of removing droplets in the airflow after the reaction of the above-mentioned flue gas and solution. CN209771401U discloses a condensation dust removal and demisting device for a desulfurization tower, which includes a polymer condenser, a rotary vane demister, a condenser water collection port, a demister water collection port, a collection water pipe, and a desulfurization wastewater treatment device. The polymer condenser and the rotary vane demister are connected in sequence to form an integrated device, and the rotary vane demister includes a rotary vane centrifugal dust removal module and a droplet discharge hole. The device cools down, condenses, and deeply removes dust and mist for wet flue gas, and has the advantages of good water-saving effect, compact equipment, and space saving. However, the device needs to be coupled with a polymer condenser, which increases energy consumption to a certain extent, increases processing costs, and is not suitable for large-scale promotion and use.

[0006] CN111841272A discloses a water-saving and energy-saving ammonia-based desulfurization ultra-clean emission system and process that eliminates ammonia escape aerosols, including a slurry disturbance system, a cooling and concentrating crystallization system, a sulfur oxide absorption system, an ammonia capture system, a washing and purification system, and a crystal particle enlargement system. The circulating spray liquid from the bottom to the top of the desulfurization tower adopts solutions of different components, and the concentration gradient decreases, which effectively improves the desulfurization efficiency, eliminates the escape of aerosols and ammonia, and eliminates the tailing and falling phenomenon of ammonia-based desulfurization flue gas. Through the combination of different technologies such as multi-stage cyclone coupling, fillers, demisters, high-efficiency cyclone water film dust collectors and wire mesh demisters, the optimization of the flue gas distribution in the tower is achieved, the flue gas residence reaction time is extended, the further condensation of fine particles and the capture of slurry droplets are promoted, and the flue gas is washed by low-temperature water washing liquid of an external cooling tower to achieve the coordinated removal of fine particles and achieve ultra-clean emissions. However, the system is complex in composition, the circulating spray liquid needs to be adjusted in time according to the actual flue gas situation, and the operation and regulation are difficult.

[0007] CN106178775A discloses a dust removal and demisting unit and method of a low resistance-cyclone coupled dust removal and demisting device, the device comprises a plurality of dust removal and demisting units, each unit at least comprises a hollow cylinder for flue gas to pass through and at least two conventional centrifugal cyclone plate modules, and at least two tubular pre-demisting modules fixed on the hollow cylinder. Saturated wet flue gas with droplets and fine particles after desulfurization enters from the bottom of the central cylinder, and at the cost of a small pressure loss, a part of the larger droplets and smoke particles in the flue gas are effectively blocked and removed through the tubular pre-demisting module. When the flue gas continues to pass through the secondary conventional centrifugal cyclone plate module, it rotates rapidly. Under the action of centrifugal force, and due to the difference in inertia between droplets and fine particles and the different rotation speeds, the larger droplets and particles remaining in the flue gas are removed, thereby achieving the effect of efficient dust removal and demisting. However, the dust removal and demisting unit has a poor removal effect on tiny droplets and particles, and aerosols will still appear, causing environmental pollution.

[0008] Therefore, it is of great significance to develop a device system and method for preventing amine escape in the carbon dioxide amine capture process, which has low processing cost, simple operation and regulation, and high efficiency in removing tiny droplets in the gas flow. Summary of the invention

[0009] In view of the problems existing in the prior art, the present invention provides a device system and method for preventing amine escape in a carbon dioxide amine capture process. The device system processes the airflow after reaction with lean amine liquid in an absorption tower through a tube bundle droplet removal device to remove amine-containing droplets carried in the airflow, thereby reducing the loss of amine liquid and reducing the pollution of the environment by amine-containing droplets entering the atmosphere.

[0010] To achieve this object, the present invention adopts the following technical solutions:

[0011] In a first aspect, the present invention provides a device system for preventing amine escape in a carbon dioxide amine capture process, the device system comprising an absorption tower system, an amine liquid system and a desorption tower system connected in sequence; a tube bundle droplet removal device is arranged on the upper part of the absorption tower system.

[0012] The device system for preventing amine from escaping in the carbon dioxide amine capture process of the present invention enables the airflow at the outlet of the absorption tower to flow through the tube bundle, thereby increasing the flow rate of the airflow, and performing high-speed centrifugal motion in the tube bundle droplet removal device, thereby achieving efficient separation of amine-containing droplets carried in the airflow.

[0013] Preferably, the absorber system comprises an absorber.

[0014] Preferably, the inner diameter of the absorption tower decreases from the tube bundle droplet removal device to the top.

[0015] It is further preferred in the present invention that the inner diameter of the absorption tower decreases from the tube bundle droplet removal device to the top, which can improve the removal efficiency of amine-containing droplets in the gas flow after the reaction with the lean amine solution.

[0016] Preferably, the tube bundle droplet removal device is arranged at the upper part of the absorption tower.

[0017] The present invention further preferably arranges the tube bundle droplet removal device at the upper part of the absorption tower. This integrated arrangement makes the internal structure of the absorption tower compact and reduces the footprint of the device system for preventing amine escape during the carbon dioxide amine capture process.

[0018] Preferably, the tube bundle droplet removal device comprises at least two cyclone separation devices.

[0019] In the present invention, the airflow after reacting with the lean amine liquid passes through a cyclone separator, generating high-speed centrifugal motion. Under the action of centrifugal force, amine-containing droplets move toward the wall of the cyclone separator. During the motion, the amine-containing droplets collide with each other, condense into larger droplets, and are thrown toward the wall. They are annihilated after contacting the liquid film layer attached to the wall, thereby achieving the removal of amine-containing droplets in the airflow.

[0020] Preferably, the cyclone separation device comprises a first impeller and a second impeller.

[0021] Preferably, the first impeller is located above the second impeller.

[0022] In the present invention, the airflow carrying amine-containing liquid droplets first passes through the second impeller and then passes through the first impeller, resulting in two cyclone separation effects.

[0023] Preferably, the first impeller is arranged at 2 / 5 or more of the distance from the top of the cyclone separation device, for example, it may be 2 / 5, 1 / 2, 3 / 5 or 4 / 5.

[0024] The present invention further preferably arranges the first impeller at 2 / 5 or more of the distance from the top of the cyclone separation device, utilizes the heat released during the reaction between the carbon dioxide in the flue gas and the lean amine liquid to make the rising airflow turbulent, and the first impeller rotates under the action of centrifugal force without the need for additional energy, thereby achieving efficient removal of amine droplets in the airflow.

[0025] Preferably, a guide ring is provided between the first impeller and the second impeller.

[0026] The present invention further preferably provides a guide ring between the first impeller and the second impeller to guide the direction of the air flow velocity and avoid the formation of disordered vortices.

[0027] Preferably, the inner diameter of the guide ring decreases from both ends to the middle.

[0028] Preferably, the angle between the circumferential surface of the guide ring and the horizontal plane is 15-60°, for example, 15°, 20°, 25°, 30°, 40°, 50° or 60°.

[0029] The circumferential surface of the guide ring described in the present invention refers to a cylindrical surface formed around the maximum diameter of the guide ring; the present invention further preferably has an inner diameter that decreases from both ends to the middle and an angle between the circumferential surface of the guide ring and the horizontal plane of 15 to 60°, which can control the airflow within a suitable flow rate range and form droplets to prevent secondary entrainment of amine-containing droplets.

[0030] Preferably, the shape of the first impeller comprises a double streamline shape.

[0031] Preferably, the shape of the second impeller comprises a double streamline shape.

[0032] The present invention further preferably has a shape of both the first impeller and the second impeller that includes a double streamline type. The double streamline impeller is smooth and easy to gather droplets, and has a small airflow resistance.

[0033] Preferably, fillers are provided in the absorption tower.

[0034] The height of the absorption tower in the present invention is not specifically limited and is determined according to the carbon dioxide content in the flue gas actually treated and the pressure drop of the absorption tower.

[0035] Preferably, the amine liquid system comprises a lean amine liquid system and a rich amine liquid system.

[0036] Preferably, the lean amine liquid system comprises a lean amine liquid conveying device, a lean-rich amine liquid heat exchange device, a lean amine liquid storage device, a lean amine liquid feeding and conveying device and a lean amine liquid cooling device which are sequentially connected in the flow direction of the lean amine liquid.

[0037] In the present invention, if the lean amine liquid after being cooled by the lean amine liquid cooling device contains impurity particles and amine salts, it needs to enter the solid-liquid separation device and the ion purification device in sequence for purification treatment before entering the lean amine liquid storage device; if the lean amine liquid after being cooled by the lean amine liquid cooling device only contains impurity particles, it only needs to enter the solid-liquid separation device for treatment before entering the lean amine liquid storage device. After purification, the lean amine liquid entering the lean amine liquid storage device enters the absorption tower through the lean amine liquid feeding and conveying device and the lean amine liquid cooling device to absorb carbon dioxide.

[0038] Preferably, the rich amine liquid system comprises a rich amine liquid conveying device and a lean-rich amine liquid heat exchange device which are sequentially connected in the flow direction of the rich amine liquid.

[0039] In the present invention, the rich amine liquid is preferably transported to the lean / rich amine liquid heat exchange device through the rich amine liquid transport device for heat exchange, so as to recover and utilize the heat in the lean amine liquid generated in the desorption tower.

[0040] Preferably, the analytical tower system comprises an analytical tower.

[0041] Preferably, a gas condensing device, a reflux liquid collecting device and a reflux liquid conveying device are arranged on the upper part of the analytical tower.

[0042] Preferably, a reboiler is provided at the bottom of the analytical tower.

[0043] In the present invention, the rich amine liquid sprayed from the decomposition tower and the water vapor evaporated from the reboiler from bottom to top are counter-heated, so that the carbon dioxide in the rich amine liquid is decomposed, and the whole decomposition process is completed.

[0044] In a second aspect, the present invention provides a method for preventing amines from escaping during a carbon dioxide amine capture process, wherein the method is performed using a device system for preventing amines from escaping during a carbon dioxide amine capture process.

[0045] The method for preventing amine from escaping in a carbon dioxide amine capture process described in the present invention utilizes a cyclone separation device in a tube bundle droplet removal device to remove amine-containing droplets carried in an airflow after reacting with an amine liquid due to the action of centrifugal force. The method has a low processing cost and a simple device system, and is suitable for large-scale promotion and use in thermal power plants, cement plants or steel mills that produce a large amount of carbon dioxide.

[0046] Preferably, the method comprises the following steps:

[0047] After the flue gas enters the absorption tower system and reacts with the lean amine liquid to remove carbon dioxide, the lean amine liquid is converted into rich amine liquid. The flue gas after carbon dioxide removal is discharged after the amine-containing droplets are removed by the tube bundle droplet removal device.

[0048] Preferably, the concentration of carbon dioxide in the flue gas is 10% to 40%, for example, it may be 10%, 15%, 18%, 20%, 25%, 30%, 35% or 40%.

[0049] Preferably, the temperature of the lean amine solution is 38-42°C, for example, 38°C, 39°C, 40°C, 41°C or 42°C.

[0050] The present invention further preferably sets the temperature of the lean amine liquid to 38-42° C., which can not only ensure efficient reaction of the lean amine liquid with carbon dioxide in the flue gas, but also reduce the evaporation of water in the lean amine liquid, thereby reducing the content of amine droplets in the outlet airflow of the absorption tower.

[0051] Preferably, the thickness of the liquid film in the tube bundle droplet removal device is 1 to 5 mm, for example, 1 mm, 2 mm, 3 mm, 4 mm or 5 mm.

[0052] As a preferred technical solution of the present invention, the method comprises the following steps:

[0053] Flue gas with a carbon dioxide concentration of 10% to 40% enters the absorption tower system, and after reacting with lean amine liquid at a temperature of 38 to 42°C to remove carbon dioxide from the flue gas, the lean amine liquid is converted into rich amine liquid. The flue gas after carbon dioxide removal passes through a tube bundle deliquescence device with a liquid film thickness of 1 to 5 mm to remove amine droplets and is discharged.

[0054] Compared with the prior art, the present invention has at least the following beneficial effects:

[0055] (1) The device system for preventing amine from escaping in the carbon dioxide amine capture process provided by the present invention utilizes the airflow after reaction with the lean amine liquid to perform high-speed centrifugal motion in the tube bundle droplet removal device to achieve efficient separation of amine-containing droplets carried in the airflow. The amine-containing droplet content in the airflow at the outlet of the absorption tower can reach 5 mg / Nm 3 the following;

[0056] (2) The method for preventing amine escape in the carbon dioxide amine capture process provided by the present invention has low processing cost, simple operation and control, and is suitable for large-scale promotion and use. BRIEF DESCRIPTION OF THE DRAWINGS

[0057] Figure 1 It is a schematic diagram of a device system for preventing amine escape in a carbon dioxide amine capture process provided in Example 1 of the present invention.

[0058] Figure 2 It is a top view of a tube bundle droplet removal device in a device system for preventing amine escape in a carbon dioxide amine capture process provided in Example 1 of the present invention.

[0059] Figure 3It is a front view of a cyclone separation device in a device system for preventing amine escape in a carbon dioxide amine capture process provided in Example 1 of the present invention.

[0060] Figure 4 It is a stereoscopic diagram of an impeller in a device system for preventing amine escape in a carbon dioxide amine capture process provided in Example 1 of the present invention.

[0061] In the figure: 1-tube bundle droplet removal device; 2-absorption tower; 3-lean amine liquid conveying device; 4-lean and rich amine liquid heat exchange device; 5-lean amine liquid storage device; 6-lean amine liquid feeding and conveying device; 7-lean amine liquid cooling device; 8-rich amine liquid conveying device; 9-filler; 10-analyzer; 11-gas condensing device; 12-reflux liquid collecting device; 13-reflux liquid conveying device; 14-carbon dioxide discharge pipe; 15-reboiling device; 16-ion purification device 17-solid-liquid separation device; 18-flue gas inlet pipe; 19-flue gas discharge pipe; 20-cyclone separation device; 21-first impeller; 22-second impeller; 23-guide ring. DETAILED DESCRIPTION

[0062] The technical solution of the present invention is further described below with reference to the accompanying drawings and through specific implementation methods.

[0063] The present invention is further described in detail below. However, the following examples are only simplified examples of the present invention and do not represent or limit the scope of protection of the present invention. The scope of protection of the present invention shall be subject to the claims.

[0064] Example 1

[0065] This embodiment provides a device system for preventing amine from escaping during the carbon dioxide amine capture process, and its schematic diagram is as follows: Figure 1 The device system comprises an absorption tower system, an amine liquid system and a desorption tower system connected in sequence; a tube bundle droplet removal device 1 is arranged on the upper part of the absorption tower system.

[0066] The absorption tower system includes an absorption tower 2; the inner diameter of the absorption tower 2 decreases from the tube bundle droplet removal device 1 to the top, and the tube bundle droplet removal device 1 is arranged at the upper part of the absorption tower 2. A packing 9 is arranged in the absorption tower 2; a flue gas inlet pipe 18 is arranged on the side of the absorption tower 2; and a flue gas discharge pipe 19 is arranged on the top of the absorption tower 2.

[0067] The amine liquid system includes a lean amine liquid system and a rich amine liquid system; the lean amine liquid system includes a lean amine liquid conveying device 3, a lean and rich amine liquid heat exchange device 4, a lean amine liquid storage device 5, a lean amine liquid feeding and conveying device 6 and a lean amine liquid cooling device 7 which are sequentially connected from the flow direction of the lean amine liquid; the lean amine liquid system also includes an ion purification device 16 and a solid-liquid separation device 17. The rich amine liquid system includes a rich amine liquid conveying device 8 and a lean and rich amine liquid heat exchange device 4 which are sequentially connected from the flow direction of the rich amine liquid.

[0068] The analysis tower system includes an analysis tower 10; a gas condensing device 11, a reflux liquid collecting device 12 and a reflux liquid conveying device 13 are arranged on the upper part of the analysis tower 10; a carbon dioxide discharge pipe 14 is arranged on the top of the reflux liquid collecting device 12; and a reboiling device 15 is arranged at the bottom of the analysis tower 10.

[0069] The top view of the tube bundle droplet removal device is as follows Figure 2 As shown, the tube bundle droplet removal device 1 includes at least two cyclone separation devices 20 .

[0070] The front view of the cyclone separator 20 is as follows Figure 3 As shown, the cyclone separator 20 includes a first impeller 21 and a second impeller 22 (stereoscopic diagram as shown in Figure 4 As shown); the first impeller 21 is located at the upper part of the second impeller 22; the first impeller 21 is set at 4 / 5 of the distance from the top of the cyclone separator 20; a guide ring 23 is provided between the first impeller 21 and the second impeller 22; the inner diameter of the guide ring 23 decreases from both ends to the middle; the angle between the circumference of the guide ring 23 and the horizontal plane is 45°; the shape of the first impeller 21 includes a double streamline type; the shape of the second impeller 22 includes a double streamline type.

[0071] Example 2

[0072] This embodiment provides a device system for preventing amine from escaping during the carbon dioxide amine capture process, the device system comprising an absorption tower system, an amine liquid system and a desorption tower system connected in sequence; a tube bundle droplet removal device is arranged on the upper part of the absorption tower system.

[0073] The absorption tower system comprises an absorption tower; the inner diameter of the absorption tower decreases from the tube bundle droplet removal device to the top; the tube bundle droplet removal device is arranged at the upper part of the absorption tower. A filler is arranged in the absorption tower; a flue gas inlet pipe is arranged at the side of the absorption tower; and a flue gas discharge pipe is arranged at the top of the absorption tower.

[0074] The lean amine liquid system comprises a lean amine liquid conveying device, a lean and rich amine liquid heat exchange device, a lean amine liquid storage device, a lean amine liquid feeding and conveying device, and a lean amine liquid cooling device, which are sequentially connected in the flow direction of the lean amine liquid; the lean amine liquid system also comprises an ion purification device and a solid-liquid separation device. The rich amine liquid system comprises a rich amine liquid conveying device and a lean and rich amine liquid heat exchange device, which are sequentially connected in the flow direction of the rich amine liquid.

[0075] The analysis tower system comprises an analysis tower; a gas condensing device, a reflux liquid collecting device and a reflux liquid conveying device are arranged on the upper part of the analysis tower; a carbon dioxide discharge pipe is arranged on the top of the reflux liquid collecting device; and a reboiling device is arranged at the bottom of the analysis tower.

[0076] The tube bundle droplet removal device includes at least two cyclone separation devices; the cyclone separation device includes a first impeller and a second impeller; the first impeller is located on the upper part of the second impeller; the first impeller is arranged at 3 / 5 of the distance from the top of the cyclone separation device; a guide ring is arranged between the first impeller and the second impeller; the inner diameter of the guide ring decreases from both ends to the middle; the angle between the circumference of the guide ring and the horizontal plane is 15°; the shape of the first impeller includes a double streamline type; the shape of the second impeller includes a double streamline type.

[0077] Example 3

[0078] This embodiment provides a device system for preventing amine from escaping during the carbon dioxide amine capture process, the device system comprising an absorption tower system, an amine liquid system and a desorption tower system connected in sequence; a tube bundle droplet removal device is arranged on the upper part of the absorption tower system.

[0079] The absorption tower system comprises an absorption tower; the inner diameter of the absorption tower decreases from the tube bundle droplet removal device to the top; the tube bundle droplet removal device is arranged at the upper part of the absorption tower. A filler is arranged in the absorption tower; a flue gas inlet pipe is arranged at the side of the absorption tower; and a flue gas discharge pipe is arranged at the top of the absorption tower.

[0080] The lean amine liquid system comprises a lean amine liquid conveying device, a lean and rich amine liquid heat exchange device, a lean amine liquid storage device, a lean amine liquid feeding and conveying device, and a lean amine liquid cooling device, which are sequentially connected in the flow direction of the lean amine liquid; the lean amine liquid system also comprises an ion purification device and a solid-liquid separation device. The rich amine liquid system comprises a rich amine liquid conveying device and a lean and rich amine liquid heat exchange device, which are sequentially connected in the flow direction of the rich amine liquid.

[0081] The analysis tower system comprises an analysis tower; a gas condensing device, a reflux liquid collecting device and a reflux liquid conveying device are arranged on the upper part of the analysis tower; a carbon dioxide discharge pipe is arranged on the top of the reflux liquid collecting device; and a reboiling device is arranged at the bottom of the analysis tower.

[0082] The tube bundle droplet removal device includes at least two cyclone separation devices; the cyclone separation device includes a first impeller and a second impeller; the first impeller is located on the upper part of the second impeller; the first impeller is arranged at 2 / 5 of the distance from the top of the cyclone separation device; a guide ring is arranged between the first impeller and the second impeller; the inner diameter of the guide ring decreases from both ends to the middle; the angle between the circumference of the guide ring and the horizontal plane is 60°; the shape of the first impeller includes a double streamline type; the shape of the second impeller includes a double streamline type.

[0083] Example 4

[0084] This embodiment provides a device system for preventing amine from escaping during the carbon dioxide amine capture process. The device system is the same as that of Embodiment 1 except that the top of the absorption tower is cylindrical.

[0085] Example 5

[0086] This embodiment provides a device system for preventing amine from escaping during the carbon dioxide amine capture process. The device system is the same as that of Embodiment 1 except that the impeller of the cyclone separation device is in a flat plate shape.

[0087] Comparative Example 1

[0088] This comparative example provides a device system for preventing amine from escaping in a carbon dioxide amine capture process. The device system is the same as Example 1 except that the tube bundle droplet removal device at the top of the absorption tower is replaced by a metal mist removal wire mesh.

[0089] Application Example 1

[0090] This application example provides a method for preventing amine from escaping during a carbon dioxide amine capture process. The method is performed using the device system for preventing amine from escaping during a carbon dioxide amine capture process provided in Example 1, and includes the following steps:

[0091] Flue gas with a carbon dioxide concentration of 30% enters the absorption tower system, and after reacting with lean amine liquid at a temperature of 40°C to remove carbon dioxide, the lean amine liquid is converted into rich amine liquid. The flue gas after carbon dioxide removal passes through a tube bundle droplet removal device with a liquid film thickness of 5mm to remove amine droplets and is discharged.

[0092] Application Example 2

[0093] This application example provides a method for preventing amine from escaping during a carbon dioxide amine capture process. The method is performed using the device system for preventing amine from escaping during a carbon dioxide amine capture process provided in Example 2, and includes the following steps:

[0094] Flue gas with a carbon dioxide concentration of 10% enters the absorption tower system, and after reacting with lean amine liquid at a temperature of 38°C to remove carbon dioxide, the lean amine liquid is converted into rich amine liquid. The flue gas after carbon dioxide removal passes through a tube bundle droplet removal device with a liquid film thickness of 1mm to remove amine droplets and is discharged.

[0095] Application Example 3

[0096] This application example provides a method for preventing amine from escaping during a carbon dioxide amine capture process. The method is performed using the device system for preventing amine from escaping during a carbon dioxide amine capture process provided in Example 3, and includes the following steps:

[0097] Flue gas with a carbon dioxide concentration of 40% enters the absorption tower system, and after reacting with lean amine liquid at a temperature of 42°C to remove carbon dioxide, the lean amine liquid is converted into rich amine liquid. The flue gas after carbon dioxide removal passes through a tube bundle droplet removal device with a liquid film thickness of 3mm to remove amine droplets and is discharged.

[0098] Application Example 4

[0099] This application example provides a method for preventing amines from escaping during a carbon dioxide amine capture process. The method is performed using the device system for preventing amines from escaping during a carbon dioxide amine capture process provided in Example 4, and the rest is the same as in Application Example 1.

[0100] Application Example 5

[0101] This application example provides a method for preventing amines from escaping during a carbon dioxide amine capture process. The method is performed using the device system for preventing amines from escaping during a carbon dioxide amine capture process provided in Example 5, and the rest is the same as in Application Example 1.

[0102] Comprehensive application examples 1 to 3 show that the absorption tower in the device system for preventing amine escape in the carbon dioxide amine capture process provided by the present invention can effectively control the amine escape phenomenon of the absorption tower outlet airflow in the capture system, and the amine droplet content in the absorption tower outlet airflow is less than 5 mg / Nm 3 .

[0103] The device system for preventing amine from escaping in the carbon dioxide amine capture process provided in Application Examples 4 and 5 has a slightly lower treatment effect on the airflow after the reaction with the lean amine liquid in the absorption tower than that in Examples 1 to 3, and the amine droplet content in the airflow at the outlet of the absorption tower is 40 to 80 mg / Nm 3 .

[0104] Application Comparative Example 1

[0105] This application comparative example provides a method for preventing amines from escaping in a carbon dioxide amine capture process. The method is carried out using the device system for preventing amines from escaping in a carbon dioxide amine capture process provided in comparative example 1, and the rest is the same as application example 1.

[0106] In the device system for preventing amine from escaping during the carbon dioxide amine capture process in this comparative example, the upper part of the absorption tower is a metal demisting screen, which has a poor treatment effect on the airflow carrying amine droplets. The content of amine droplets in the airflow at the outlet of the absorption tower is 120-200 mg / Nm 3 .

[0107] In summary, the device system and method for preventing amine escape in the carbon dioxide amine capture process provided by the present invention has a good effect on treating the airflow at the outlet of the absorption tower in the amine method carbon dioxide capture system, effectively preventing amine escape in the airflow and reducing environmental pollution.

[0108] The applicant declares that the present invention illustrates the detailed structural features of the present invention through the above-mentioned embodiments, but the present invention is not limited to the above-mentioned detailed structural features, that is, it does not mean that the present invention must rely on the above-mentioned detailed structural features to be implemented. Those skilled in the art should understand that any improvement of the present invention, equivalent replacement of the components selected by the present invention, addition of auxiliary components, selection of specific methods, etc., all fall within the protection scope and disclosure scope of the present invention.

Claims

1. A device system for preventing amine from escaping during the carbon dioxide amine capture process, characterized in that: The device system comprises an absorption tower system, an amine liquid system and a desorption tower system connected in sequence; a tube bundle droplet removal device is arranged on the upper part of the absorption tower system; The tube bundle droplet removal device comprises at least two cyclone separation devices; The cyclone separation device comprises a first impeller and a second impeller; The first impeller is located above the second impeller; The first impeller is arranged at or above 2 / 5 of the distance from the top of the cyclone separation device; A guide ring is provided between the first impeller and the second impeller; The inner diameter of the guide ring decreases from both ends to the middle; The shape of the first impeller includes a double streamline shape; The shape of the second impeller includes a double streamline shape.

2. The device system according to claim 1, characterized in that: The absorption tower system includes an absorption tower.

3. The device system according to claim 2, characterized in that: The inner diameter of the absorption tower decreases from the tube bundle droplet removal device to the top.

4. The device system according to claim 2, characterized in that: The tube bundle droplet removal device is arranged at the upper part of the absorption tower.

5. The device system according to claim 1, characterized in that: The angle between the circumference of the guide ring and the horizontal plane is 15-60°.

6. The device system according to claim 2, characterized in that: Fillers are arranged in the absorption tower.

7. The device system according to claim 1, characterized in that: The amine liquid system comprises a lean amine liquid system and a rich amine liquid system.

8. The device system according to claim 7, characterized in that: The lean amine liquid system comprises a lean amine liquid conveying device, a lean and rich amine liquid heat exchange device, a lean amine liquid storage device, a lean amine liquid feed conveying device and a lean amine liquid cooling device which are sequentially connected in the flow direction of the lean amine liquid.

9. The device system according to claim 7, characterized in that: The rich amine liquid system comprises a rich amine liquid conveying device and a lean-rich amine liquid heat exchange device which are sequentially connected in the flow direction of the rich amine liquid.

10. The device system according to claim 1, characterized in that: The analytical tower system includes an analytical tower.

11. The device system according to claim 10, characterized in that: A gas condensing device, a reflux liquid collecting device and a reflux liquid conveying device are arranged on the upper part of the analytical tower.

12. The device system according to claim 10, characterized in that: A reboiler is provided at the bottom of the analytical tower.

13. A method for preventing amine from escaping during carbon dioxide amine capture process, characterized in that: The method is carried out using the device system for preventing amine escape in the carbon dioxide amine capture process as described in any one of claims 1 to 12.

14. The method according to claim 13, characterized in that The method comprises the following steps: After the flue gas enters the absorption tower system and reacts with the lean amine liquid to remove carbon dioxide, the lean amine liquid is converted into rich amine liquid. The flue gas after carbon dioxide removal is discharged after the amine-containing droplets are removed by the tube bundle droplet removal device.

15. The method according to claim 14, characterized in that The concentration of carbon dioxide in the flue gas is 10% to 40%.

16. The method according to claim 14, characterized in that The temperature of the lean amine solution is 38-42°C.

17. The method according to claim 14, characterized in that The thickness of the liquid film in the tube bundle droplet removal device is 1-5 mm.

18. The method according to claim 13, characterized in that The method comprises the following steps: Flue gas with a carbon dioxide concentration of 10%~40% enters the absorption tower system, and after reacting with lean amine liquid at a temperature of 38~42℃ to remove carbon dioxide from the flue gas, the lean amine liquid is converted into rich amine liquid. The flue gas after carbon dioxide removal passes through a tube bundle deliquescence device with a liquid film thickness of 1~5mm to remove amine droplets and is discharged.

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