An amine recovery method and apparatus for a carbon dioxide capture system

Abstract

The present application relates to the technical field of carbon dioxide capture, and particularly relates to an amine recovery method and device for a carbon dioxide capture system. The device comprises: at least two sleeves; the sleeve comprises: two open ends in the shape of a ring, and at least six side wall strips in the shape of a broken line; the two ends of the side wall strip are connected to the two open ends of the sleeve respectively; a bleed air fan; the plane where the fan blade of the bleed air fan is located is parallel to the plane where the two open ends of the sleeve in the shape of a ring are located; the side wall strip and the fan blade of the bleed air fan are made of a polypropylene hydrophilic material. The amine recovery device of the present application has good hydrophilicity, strong amine recovery capacity, light weight, corrosion resistance, simple structure, easy installation and manufacture, convenient maintenance, long service life, and the like. When the amine recovery device of the present application is used for amine recovery, water can be recovered synchronously, the process is simple, a water washing tower does not need to be added, investment is small, cost is low, and operation energy consumption is low.

Description

Technical Field

[0001] This invention relates to the field of carbon dioxide capture technology, and in particular to an amine recovery method and apparatus for a carbon dioxide capture system. Background Technology

[0002] Currently, commonly used methods for amine recovery in carbon dioxide capture systems include acidification and water washing techniques, as well as water washing tower recovery techniques. However, regardless of whether acidification and water washing are used, it is necessary to add a tower or increase the height of the absorption tower, and then divide the absorption tower into an absorption section and a water washing section.

[0003] This requires consuming large amounts of demineralized water or acidified water to recover organic amines from flue gas; moreover, from a practical application perspective, existing technologies involve large investments, high water consumption, and high energy consumption.

[0004] Therefore, proposing a method and apparatus for amine recovery in carbon dioxide capture systems with lower construction investment, operating costs, and energy consumption has become a technical problem that urgently needs to be solved in this field. Summary of the Invention

[0005] To solve the above-mentioned technical problems, the present invention provides an amine recovery device, comprising:

[0006] At least two sleeves; each sleeve includes: annular openings at both ends, and at least six zigzag sidewall strips; the two ends of each sidewall strip are respectively connected to the two openings at both ends of the sleeve;

[0007] Exhaust fan; the plane on which the blades of the exhaust fan are located is parallel to the plane on which the annular openings at both ends of the sleeve are located;

[0008] The sidewall strips and the fan blades of the exhaust fan are made of hydrophilic polypropylene.

[0009] In some embodiments, the expiratory fan is located at the top of the sleeve.

[0010] In some implementations, the blade angle of the exhaust fan is adjustable, and the blade angle can be adjusted according to the required airflow speed.

[0011] In some implementations, when there are two or more sleeves, the annular openings at both ends of the different sleeves are concentric rings.

[0012] In practice, different sleeves have different diameters of annular openings, and the combination of sleeves with different diameters can be adjusted according to the actual situation.

[0013] In some embodiments, the cross-section of the sidewall strip is elliptical or rectangular.

[0014] In some implementations, the sidewall strip is formed by bending an elliptical cylinder or cuboid into a zigzag shape.

[0015] In some embodiments, the polypropylene hydrophilic material is a mixture of polypropylene and a hydrophilic modifier; the amount of the hydrophilic modifier is 10% to 40% of the weight of the polypropylene.

[0016] The hydrophilic modifier is at least one of amino acid-based hydrophilic modifiers, allyl group-based hydrophilic modifiers, hydroxyl group-based hydrophilic modifiers, and maleic anhydride hydrophilic modifiers.

[0017] In some embodiments, the sidewall strips are evenly distributed along the circumference of the openings at both ends of the annulus.

[0018] In some implementations, a gap is left between two adjacent sidewall strips.

[0019] In some embodiments, a grid pattern is designed on the surface of the sidewall strip;

[0020] And / or, design parallel stripe patterns on the surface of the air duct fan blades.

[0021] By setting grid or stripe patterns, the ability to capture organic amines and small droplets in the gas can be improved, reducing the loss of organic amines and water. At the same time, setting grid or stripe patterns can also guide the flow, facilitating the recovery of organic amines and water.

[0022] Preferably, the rhombus side length of the grid pattern is 3 to 10 mm.

[0023] Preferably, the spacing between adjacent parallel lines in the striped pattern is 3 to 5 mm.

[0024] In some implementations, the amine recovery device further includes:

[0025] A guide tube; the guide tube is connected to an annular opening on one side of the sleeve.

[0026] In some implementations, the amine recovery device further includes:

[0027] Collection pool; the collection pool is connected to the guide pipe.

[0028] Furthermore, the present invention provides an amine recovery method, comprising:

[0029] The amine recovery device in any of the above embodiments is placed in the exhaust gas containing organic amines; the exhaust gas flow is allowed to pass through the sleeve in a direction perpendicular to the annular opening of the sleeve; the sleeve rotates about the direction of the exhaust gas flow as the central axis;

[0030] An exhaust fan is installed at the outlet of the sleeve through which the exhaust gas flows to overcome resistance.

[0031] In some embodiments, the rotation direction of the sleeve is the same as or different from the rotation direction of the air duct fan blades.

[0032] In some implementations, when there are two or more sleeves, the rotation direction and rotation speed of each sleeve can be adjusted independently.

[0033] In some implementations, the rotational speed of the exhaust fan blades can be adjusted.

[0034] In some implementations, the amine recovery device is placed within a carbon dioxide capture system.

[0035] In some implementations, the amine recovery device is located at the outlet of the absorption tower.

[0036] In some embodiments, the annular opening of the sleeve is made of a metallic material.

[0037] When the device of the present invention is running, the sleeve and the exhaust fan blades rotate around the central axis. When the exhaust gas passes through the sleeve, the exhaust gas flow passes through the zigzag-shaped hydrophilic polypropylene sidewall strips. At the bends of the sidewall strips 12, collisions occur continuously. The entire sidewall strip continuously captures organic amines and moisture in the exhaust gas, and then, through the grid pattern on its surface, it is guided to the guide pipe connected to the annular opening at the bottom of the sleeve, where it is further collected in the collection pool. Simultaneously, the exhaust gas passing through the sleeve collides with the exhaust fan blades at the top of the sleeve. The hydrophilic polypropylene material on the blades further captures organic amines and moisture, and through centrifugal force, it is guided along the parallel stripe pattern to the outermost absorption tower sidewall, finally flowing into the collection pool at the bottom.

[0038] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0039] This invention provides an amine recovery device containing polypropylene hydrophilic material, which has good hydrophilicity, strong amine recovery capacity, is lightweight, corrosion-resistant, simple in structure, easy to manufacture and install, convenient to maintain, and has a long service life. When using the amine recovery device of this invention for amine recovery, water can be recovered simultaneously. The process is simple, does not require an additional water washing tower, has low investment, low cost, and low operating energy consumption. Attached Figure Description

[0040] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0041] Figure 1 This is one of the structural schematic diagrams of the amine recovery device provided by the present invention;

[0042] Figure 2 This is one of the schematic diagrams of the sleeve structure of the amine recovery device provided by the present invention;

[0043] Figure 3 This is one of the structural schematic diagrams of the sidewall strips of the amine recovery device provided by the present invention;

[0044] Figure 4 This is one of the schematic diagrams of the stripe pattern on the fan blades of the amine recovery device provided by the present invention;

[0045] Figure label:

[0046] 1: Sleeve; 11: Annular opening; 12: Side wall strip;

[0047] 2: Exhaust fan; 21: Fan blades;

[0048] 3: Drainage pipe; 4: Collection pool. Detailed Implementation

[0049] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0050] The following is combined Figures 1-4 The amine recovery apparatus of the present invention is described as an example.

[0051] The amine recovery device in this embodiment ( Figure 1 Includes: two sleeves 1 ( Figure 2 Each sleeve 1 includes: annular openings 11 at both ends made of stainless steel S30408 ​​material, the annular openings on the same side of the two sleeves being concentric rings; the upper and lower annular openings 11 of each sleeve are connected by a bent rectangular sidewall strip 12 in a zigzag shape. Figure 3 The sidewall strips 12 are evenly distributed along the circumference of the openings at both ends of the ring, with 6 sidewall strips on the inner sleeve and 9 sidewall strips on the outer sleeve. Each sidewall strip 12 is made of polypropylene hydrophilic material; the polypropylene hydrophilic material is a mixture of polypropylene and a hydrophilic modifier, the hydrophilic modifier being maleic anhydride hydrophilic modifier, and the amount of maleic anhydride hydrophilic modifier being 10% of the weight of polypropylene; the surface of each sidewall strip 12 is embossed with a grid pattern (the grid is diamond-shaped, with a side length of 3mm). Figure 3 A gap is left between two adjacent sidewall strips;

[0052] At the top of the concentric sleeve 1, an air-expelling fan 2 is provided; the air-expelling fan has 5 fan blades 21, each fan blade 21 is made of the aforementioned hydrophilic polypropylene material; the lower surface of each fan blade 21 is pressed with parallel stripe patterns (stripe spacing 3mm) Figure 4 The plane containing the fan blade 21 is parallel to the plane containing the annular opening 11 of the sleeve.

[0053] A guide pipe 3 is connected to the bottom of each sleeve 1. One end of the guide pipe 3 is connected to the side wall strip 12 of the sleeve 1, and the other end of the guide pipe 3 is connected to the collection tank 4.

[0054] Furthermore, the present invention provides a method for amine recovery using the above-described amine recovery device, comprising:

[0055] The above-mentioned amine recovery device ( Figure 1 Place it in the exhaust gas containing organic amines; let the exhaust gas flow from bottom to top through the two sleeves along the direction of the vertical sleeve annular opening 11; the two sleeves 1 rotate independently in the same direction with the exhaust gas flow direction as the central axis;

[0056] An exhaust fan 2 is installed at the outlet of the exhaust gas flow through the sleeve 1 to overcome resistance; the rotation direction of the two sleeves 1 is the same as the rotation direction of the fan blades 21 of the exhaust fan 2.

[0057] When the amine recovery device is running, the two sleeves 1 and the exhaust fan 21 rotate around the central axis. When the exhaust gas passes through the two sleeves 1, the exhaust gas flow passes through the zigzag sidewall strips 12, and collisions occur continuously at the bends of the sidewall strips 12. The entire sidewall strip continuously captures organic amines and moisture in the exhaust gas, and then passes through the grid pattern ( Figure 3 The exhaust gas flows into the guide pipe 3 connected to the annular opening 11 at the bottom of the sleeve, and is further collected in the collection pool 4. Simultaneously, the exhaust gas passing through the sleeve collides with the fan blades 21 of the exhaust fan 2 at the top of the sleeve. The hydrophilic polypropylene material on the fan blades 21 further captures organic amines and moisture, and further, through centrifugal force, along the parallel striped pattern... Figure 4 The water is directed to the outermost sidewall of the absorption tower and finally flows into the collection pool at the bottom.

[0058] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An amine recovery apparatus characterized by, The application relates to a device for recovering amine from tail gas, comprising: at least two sleeves, each of which comprises two open ends in a ring shape and at least six side wall strips in a zigzag shape, and the two ends of each side wall strip are connected to the two open ends of the sleeve; an air guide fan, the plane of the fan blade of the air guide fan is parallel to the plane of the two open ends of the sleeve in a ring shape; the side wall strips and the fan blade of the air guide fan are made of a polypropylene hydrophilic material; the air guide fan is located at the top of the sleeve; the rotating direction of the sleeve is the same as or different from the rotating direction of the fan blade of the air guide fan.

2. The amine recovery apparatus of claim 1, wherein, When there are two or more sleeves, the two open ends in a ring shape of different sleeves are concentric rings.

3. The amine recovery apparatus of claim 1, wherein, The cross section of the side wall strip is in an oval or rectangular shape.

4. The amine recovery apparatus of claim 1, wherein, The polypropylene hydrophilic material is a mixture of polypropylene and a hydrophilic modifier, and the amount of the hydrophilic modifier is 10-40% of the weight of the polypropylene; the hydrophilic modifier is at least one of an amino acid hydrophilic modifier, an allyl group hydrophilic modifier, a hydroxyl group hydrophilic modifier and a maleic anhydride hydrophilic modifier.

5. The amine recovery apparatus of claim 1, wherein, The side wall strips are uniformly distributed along the circumference of the two open ends in a ring shape.

6. The amine recovery apparatus of claim 1, wherein, A grid pattern is designed on the surface of the side wall strip. And / or, a parallel stripe pattern is designed on the surface of the fan blade of the air guide fan.

7. The amine recovery apparatus of claim 1, wherein, Further comprising: a flow guide pipe, which is connected to the ring-shaped opening on one side of the sleeve.

8. The amine recovery apparatus of claim 7, wherein, Further comprising: a collection pool, which is connected to the flow guide pipe.

9. An amine recovery process characterized by, The application further relates to a method for recovering amine from tail gas, comprising: placing the amine recovery device in the tail gas containing organic amine, and making the tail gas flow pass through the sleeve along the direction perpendicular to the ring-shaped opening of the sleeve, and rotating the sleeve with the tail gas flow direction as the central axis; setting the air guide fan at the outlet of the sleeve through which the tail gas flow passes, so as to overcome the resistance.

10. The amine recovery process of claim 9, wherein, The rotating direction of the sleeve is the same as or different from the rotating direction of the fan blade of the air guide fan.

Images