A carbon dioxide removal device for improving biogas purity

Abstract

The present invention discloses a carbon dioxide removal device for improving the purity of biogas, comprising a lower purification tank, the upper end of the lower purification tank is movably connected to an upper purification tank, the lower end of the lower purification tank is fixedly connected to an electromagnetic stirring box, the upper end of the upper purification tank is fixedly connected to an upper sealing cover by screws, the outer side of the upper end of the lower purification tank and the outer side of the lower end of the upper purification tank are fixedly connected to limit rings, the limit ring and another limit ring are connected by stud bolts, the upper purification tank is fixedly connected with a first positioning ring and a second positioning ring from top to bottom in sequence, and the lower end of the lower purification tank is fixedly connected with a third positioning ring. The carbon dioxide removal device for improving the purity of biogas removes carbon dioxide from biogas in different ways, effectively improves the purity of biogas, facilitates the disassembly and replacement of the first separation membrane, the second separation membrane and the third separation membrane, and ensures the adsorption effect of clinoptilolite at different positions on the disc on carbon dioxide in biogas.

Description

Technical Field

[0001] The invention relates to the technical field of biogas purification equipment, in particular to a carbon dioxide removal device for improving the purity of biogas. Background Art

[0002] In nature, biogas mostly comes from swamp mud. The gas produced by the decomposition of cellulose-containing organic matter in the pond is called biogas when it is isolated from the air and decomposed by bacteria. The main component of biogas is methane, which can be used as fuel and chemical raw material.

[0003] Biogas contains more than 30% carbon dioxide and a small amount of sulfide, which affect its calorific value and pollute the environment. In order to remove the impurity components in biogas and make it high-quality methane with high methane content, calorific value and impurity gas component quality that meet the standards, biogas needs to be purified. In order to increase the concentration of methane gas, a multi-stage membrane separation process is often used to remove carbon dioxide and improve the purification of biogas. However, the existing purification device has the disadvantages of single function, separation only through the filter membrane, poor effect of removing carbon dioxide, low purity of the obtained methane, complex structure, and inconvenient disassembly and replacement of the filter membrane. Summary of the invention

[0004] In order to overcome the deficiencies of the prior art, the purpose of the utility model is to provide a carbon dioxide removal device for improving the purity of biogas, which can remove carbon dioxide in biogas in different ways and effectively improve the purity of biogas.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a carbon dioxide removal device for improving the purity of biogas, comprising a lower purification tank, wherein an air inlet valve is fixedly connected to the lower side of the left end of the lower purification tank, an upper purification tank is movably connected to the upper end of the lower purification tank, an electromagnetic stirring box is fixedly connected to the lower end of the lower purification tank, an upper sealing cover is fixedly connected to the upper end of the upper purification tank by screws, a limiting ring is fixedly connected to the outer side of the upper end of the lower purification tank and the outer side of the lower end of the upper purification tank, the limiting ring and another limiting ring are connected by stud bolts, a first positioning ring and a second positioning ring are fixedly connected in sequence from top to bottom in the upper purification tank, a first limiting groove and a second limiting groove which are equidistantly distributed in an annular manner are opened in sequence from top to bottom in the upper purification tank, a third limiting groove which is equidistantly distributed in an annular manner is opened on the upper side of the inner side of the lower purification tank, a third positioning ring is fixedly connected below the third limiting groove in the lower purification tank, a first separation membrane is movably connected to the upper end of the first positioning ring, a second separation membrane is movably connected to the lower end of the second positioning ring, and the first The third separation membrane is movably connected to the upper end of the three positioning rings, an annular groove is provided in the lower purification tank, the annular groove is located below the third positioning ring, a disc is rotatably connected in the annular groove, a motor is fixedly connected to the upper end of the bottom of the electromagnetic stirring box, a cross bar is fixedly connected to the upper end of the motor, a magnet symmetrically arranged on the upper end of the cross bar is fixedly connected, a stirrer is provided at the lower end of the bottom of the lower purification tank, an upper water baffle plate and a lower water baffle plate are fixedly connected in sequence from top to bottom in the lower purification tank, a liquid adding valve and a liquid drain valve are fixedly connected to the right end of the lower purification tank from top to bottom, the liquid adding valve is installed below the upper water baffle plate, the upper water baffle plate is installed below the disc, through holes aligned up and down are provided on the upper water baffle plate and the lower water baffle plate, a connecting rod is inserted in the through hole, the first limiting groove, the second limiting groove and the third limiting groove are all fixedly connected to limiting springs, the limiting spring is fixedly connected to the outside of the limiting spring, and the limiting block is snap-fitted to the first separation membrane, the second separation membrane and the third separation membrane.

[0006] Preferably, grooves are provided at the upper end of the lower purification tank and the lower end of the upper purification tank, sealing rings are fixedly connected in the grooves, the heights of the grooves and the sealing rings are equal, a methane outlet valve and a carbon dioxide outlet valve are fixedly connected to the upper end of the upper sealing cover from left to right in sequence, and the inner diameter and outer diameter of the lower purification tank and the upper purification tank are equal.

[0007] Preferably, a material changing port which is connected with the annular groove is opened at the left end of the lower purification tank, the lower end of the material changing port is flush with the lower end of the annular groove, a detachable material changing cover is fixedly connected to the outer side of the material changing port, and the area of ​​the material changing port is smaller than the area of ​​the material changing cover.

[0008] Preferably, a rotating rod is rotatably connected to the upper end of the disc, an annular partition plate equidistantly distributed is fixedly connected to the outer side of the rotating rod, clinoptilolite is arranged at intervals on the upper end of the disc, and the disc is of hollow design.

[0009] Preferably, a slot is provided at the upper end of the stirring rod, a block is fixedly connected to the lower end of the connecting rod, the block and the slot are snap-fitted, and the upper end of the connecting rod is connected to the lower end of the disc.

[0010] Preferably, the first limiting groove, the second limiting groove and the third limiting groove are of the same specifications.

[0011] Preferably, the pore sizes of the first separation membrane, the second separation membrane and the third separation membrane decrease in sequence.

[0012] Preferably, the annular groove, the disc, the motor, the stirrer, the through hole and the connecting rod are concentric circle structures, and two magnets are provided, and the magnetism of the magnet is opposite to that of the other magnet.

[0013] Preferably, the upper water baffle and the lower water baffle are both designed to be inclined, and one end of the upper water baffle and the lower water baffle close to the center point of the lower purification tank is lower than the other end of the upper water baffle and the lower water baffle, and the length of the upper water baffle and the lower water baffle is greater than the radius of the lower purification tank.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] 1. The carbon dioxide removal device for improving the purity of biogas improves the functionality of the purification device by using clinoptilolite, lime water solution, the first separation membrane, the second separation membrane and the third separation membrane in combination, and removes carbon dioxide from the biogas in different ways to effectively improve the purity of the biogas;

[0016] 2. The carbon dioxide removal device for improving the purity of biogas has a split design for the lower purification tank and the upper purification tank, which is convenient for cleaning the interior of the lower purification tank and the upper purification tank. The first separation membrane, the second separation membrane and the third separation membrane are convenient for fixing by using a limit spring and a limit block. The device has a simple structure and is convenient for disassembly, assembly and replacement of the first separation membrane, the second separation membrane and the third separation membrane, thereby ensuring the separation effect of carbon dioxide.

[0017] 3. The carbon dioxide removal device for improving the purity of biogas drives the lime water solution to stir by a stirrer, and since the carbon dioxide and the calcium hydroxide water solution generate calcium carbonate precipitation, the carbon dioxide in the biogas is removed. At the same time, under the action of the upper water retaining plate and the lower water retaining plate, the clinoptilolite is prevented from being wetted, and the disc is driven to rotate under the action of the connecting rod, so as to ensure the adsorption effect of the clinoptilolite at different positions on the disc on the carbon dioxide in the biogas. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0019] Figure 2It is a schematic diagram of the front structure of the present invention;

[0020] Figure 3 For the present invention Figure 2 Schematic diagram of the AA section structure;

[0021] Figure 4 This is a schematic diagram of the structure of the present invention when the upper purification tank is removed;

[0022] Figure 5 This is a schematic diagram of the installation structure of the disc and the partition of the present invention;

[0023] Figure 6 For the present invention Figure 2 Enlarged structural diagram at B in the middle.

[0024] In the figure: 1, lower purification tank; 2, upper purification tank; 3, electromagnetic stirring box; 4, screw; 5, upper sealing cover; 6, limiting ring; 7, stud bolt; 8, first positioning ring; 9, second positioning ring; 10, first limiting groove; 11, second limiting groove; 12, third limiting groove; 13, third positioning ring; 14, first separation membrane; 15, second separation membrane; 16, third separation membrane; 17, annular groove; 18, disc; 19, motor; 20, cross bar; 21 , magnet; 22, stirring bar; 23, upper water retaining plate; 24, lower water retaining plate; 25, through hole; 26, connecting rod; 27, limit spring; 28, limit block; 29, groove; 30, sealing ring; 31, methane outlet valve; 32, carbon dioxide outlet valve; 33, material change port; 34, material change cover; 35, liquid filling valve; 36, drain valve; 37, rotating rod; 38, partition; 39, clinoptilolite; 40, slot; 41, block; 42, intake valve. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] See also Figure 1-6The present invention provides a technical solution: a carbon dioxide removal device for improving the purity of biogas, comprising a lower purification tank 1, an upper purification tank 2, an electromagnetic stirring box 3, a screw 4, an upper sealing cover 5, a limiting ring 6, a stud 7, a first positioning ring 8, a second positioning ring 9, a first limiting groove 10, a second limiting groove 11, a third limiting groove 12, a third positioning ring 13, a first separation membrane 14, a second separation membrane 15, a third separation membrane 16, an annular groove 17, a disc 18, a motor 19, a cross bar 20, a magnet 21, a stirrer 22, an upper water retaining plate 23, a lower water retaining plate 24, a through hole 25, a connecting rod 26, a limiting spring 27, a limiting block 28, a groove 29, a sealing ring 30, a methane outlet valve 31, a carbon dioxide outlet valve 32, a material change port 33, a material replacement cover 34, a liquid filling valve 35, a liquid discharge valve 36, a rotating rod 37, a partition 38, a clinoptilolite 39, a slot 40, a block 41 and an air intake valve 42, the lower left end of the lower purification tank 1 is fixedly connected with an air intake valve 42; the upper end of the lower purification tank 1 is movably connected with the upper purification tank 2, the lower end of the lower purification tank 1 is fixedly connected with an electromagnetic stirring box 3, the upper end of the upper purification tank 2 is fixedly connected with an upper sealing cover 5 by a screw 4, the outer side of the upper end of the lower purification tank 1 and the outer side of the lower end of the upper purification tank 2 are fixedly connected with a limiting ring 6, the limiting ring 6 and another limiting ring 6 are connected by a stud bolt 7, the upper purification tank 2 is fixedly connected with a first positioning ring 8 and a second positioning ring 9 from top to bottom, and the upper purification tank 2 is provided with a first limiting ring 8 and a second limiting ring 9 from top to bottom. The lower purification tank 1 has a plurality of inner and outer circumferential grooves 10 and a second limiting groove 11, and the inner and outer sides of the lower purification tank 1 are provided with a third limiting groove 12 with equidistant distribution in an annular manner. A third positioning ring 13 is fixedly connected below the third limiting groove 12 in the lower purification tank 1, and a first separation membrane 14 is movably connected to the upper end of the first positioning ring 8, and a second separation membrane 15 is movably connected to the lower end of the second positioning ring 9, and a third separation membrane 16 is movably connected to the upper end of the third positioning ring 13. The lower purification tank 1 is provided with an annular groove 17, and the annular groove 17 is located below the third positioning ring 13. A disc 18 is rotatably connected in the annular groove 17. A motor 19 is fixedly connected to the upper end of the bottom of the electromagnetic stirring box 3, and a cross bar 20 is fixedly connected to the upper end of the motor 19. A magnet 21 symmetrically arranged on the left and right is fixedly connected to the upper end of the cross bar 20. A stirring bar 22 is provided at the lower end of the bottom of the tank 1, an upper water baffle plate 23 and a lower water baffle plate 24 are fixedly connected in sequence from top to bottom in the lower purification tank 1, a liquid adding valve 35 and a liquid drain valve 36 are fixedly connected in sequence from top to bottom at the right end of the lower purification tank 1, the liquid adding valve 35 is installed below the upper water baffle plate 23, the upper water baffle plate 23 is installed below the disc 18, through holes 25 aligned up and down are provided on the upper water baffle plate 23 and the lower water baffle plate 24, a connecting rod 26 is inserted in the through hole 25, a limiting spring 27 is fixedly connected in the first limiting groove 10, the second limiting groove 11 and the third limiting groove 12, a limiting block 28 is fixedly connected to the outside of the limiting spring 27, and the limiting block 28 is snap-fitted to the first separation membrane 14, the second separation membrane 15 and the third separation membrane 16;

[0027] Furthermore, a groove 29 is provided at the upper end of the lower purification tank 1 and the lower end of the upper purification tank 2, a sealing ring 30 is fixedly connected in the groove 29, the height of the groove 29 and the sealing ring 30 are equal, and a methane outlet valve 31 and a carbon dioxide outlet valve 32 are fixedly connected to the upper end of the upper sealing cover 5 from left to right in sequence, and the inner diameter and outer diameter of the lower purification tank 1 and the upper purification tank 2 are equal. By using the sealing ring 30, the sealing between the upper end of the lower purification tank 1 and the upper purification tank 2 is effectively improved;

[0028] Furthermore, a refueling port 33 intersecting the annular groove 17 is provided at the left end of the lower purification tank 1, the lower end of the refueling port 33 is flush with the lower end of the annular groove 17, and a detachable refueling cover 34 is fixedly connected to the outer side of the refueling port 33, and the area of ​​the refueling port 33 is smaller than the area of ​​the refueling cover 34, so as to ensure the sealing performance and facilitate the replacement of the clinoptilolite 39;

[0029] Furthermore, the upper end of the disc 18 is rotatably connected to a rotating rod 37, and the outer side of the rotating rod 37 is fixedly connected to an annular equidistantly distributed partition 38, and the upper end of the disc 18 is provided with clinoptilolite 39 at intervals. The disc 18 is a hollow design, and the clinoptilolite 39 between different partitions 38 can be easily taken out by rotating the partition 38;

[0030] Furthermore, a slot 40 is provided at the upper end of the stirrer 22, a block 41 is fixedly connected to the lower end of the connecting rod 26, the block 41 and the slot 40 are snap-fitted, the upper end of the connecting rod 26 is connected to the lower end of the disc 18, and the block 41 and the slot 40 are used in coordination, so that the disc 18 can be driven to rotate when the stirrer 22 rotates, so that the clinoptilolite 39 at different positions can all work;

[0031] Furthermore, the first limiting groove 10, the second limiting groove 11 and the third limiting groove 12 are of the same specifications, ensuring the fixing effect of the first separation membrane 14 and the second separation membrane 15;

[0032] Furthermore, the pore sizes of the first separation membrane 14, the second separation membrane 15 and the third separation membrane 16 decrease in sequence, so as to facilitate the classification of the biogas and ensure the separation effect;

[0033] Furthermore, the annular groove 17, the disc 18, the motor 19, the stirrer 22, the through hole 25 and the connecting rod 26 are concentric circle structures, two magnets 21 are provided, and the magnetism of the magnet 21 is opposite to that of the other magnet 21. The calcium hydroxide aqueous solution is stirred by the rotation of the stirrer 22, so that the gas reacts better with the solution;

[0034] Furthermore, the upper water baffle 23 and the lower water baffle 24 are both designed to be inclined, and one end of the upper water baffle 23 and the lower water baffle 24 close to the center point of the lower purification tank 1 is lower than the other end of the upper water baffle 23 and the lower water baffle 24. The length of the upper water baffle 23 and the lower water baffle 24 is greater than the radius of the lower purification tank 1, thereby preventing the solution from splashing on the disc 18 and not affecting the passage of gas.

[0035] Working principle: first open the material change cover 34, put clinoptilolite 39 between the upper baffle 38 and another baffle 38 of the disc 18 through the material change port 33, then rotate the disc 18, add clinoptilolite 39 in sequence, until all the baffles 38 have clinoptilolite 39, close the material change cover 34, add calcium hydroxide aqueous solution into the lower purification tank 1 through the liquid adding valve 35, turn on the motor 19, the motor 19 drives the cross bar 20 and the magnet 21 to rotate, and drives the stirrer 22 to rotate under the action of the magnet 21, the connecting rod 26 at the upper end of the stirrer 22 rotates synchronously, the disc 18 at the upper end of the connecting rod 26 rotates in the annular groove 17, and the pressurized biogas is connected from the air inlet valve 42, and the carbon dioxide in the biogas reacts with the calcium hydroxide aqueous solution to form calcium carbonate precipitation, thereby removing dioxygen in the biogas. Carbon dioxide is adsorbed, and other gases pass through the disc 18 from the gap between the upper water retaining plate 23 and the lower water retaining plate 24. Since the disc 18 is rotating, the clinoptilolites 39 at different positions on the disc 18 can adsorb the carbon dioxide in the biogas. The biogas after the secondary treatment passes through the third separation membrane 16, the second separation membrane 15 and the first separation membrane 14 in sequence. Under normal circumstances, the permeation speed of carbon dioxide is fast, the carbon dioxide outlet valve 32 is opened, the methane outlet valve 31 is closed, and carbon dioxide is discharged from the carbon dioxide outlet valve 32 as fast gas in the form of permeable gas, then the methane outlet valve 31 is opened, and the carbon dioxide outlet valve 32 is closed. The permeation speed of methane is slow, and it is discharged from the methane outlet valve 31 as slow gas in the form of residual gas to obtain high-purity biogas, and finally the drain valve 36 is opened to discharge the calcium hydroxide aqueous solution.

[0036] Finally, it should be noted that the above content is only used to illustrate the technical solution of the present invention, rather than to limit the scope of protection of the present invention. Simple modifications or equivalent substitutions of the technical solution of the present invention by ordinary technicians in this field do not deviate from the essence and scope of the technical solution of the present invention.

Claims

1. A device for removing carbon dioxide for improving the purity of biogas, comprising a lower purification tank (1), characterized in that: The lower left end of the lower purification tank (1) is fixedly connected to an air inlet valve (42); the upper end of the lower purification tank (1) is movably connected to an upper purification tank (2); the lower end of the lower purification tank (1) is fixedly connected to an electromagnetic stirring box (3); the upper end of the upper purification tank (2) is fixedly connected to an upper sealing cover (5) via screws (4); the outer side of the upper end of the lower purification tank (1) and the outer side of the lower end of the upper purification tank (2) are fixedly connected to a limiting ring (6); the limiting ring (6) and another limiting ring (6) are connected via stud bolts (7); a first positioning ring (8) and a second positioning ring (9) are fixedly connected in sequence from top to bottom in the upper purification tank (2); (2) is provided with a first limiting groove (10) and a second limiting groove (11) which are equidistantly distributed in an annular manner from top to bottom, and a third limiting groove (12) which is equidistantly distributed in an annular manner is provided on the upper inner side of the lower purification tank (1). A third positioning ring (13) is fixedly connected below the third limiting groove (12) in the lower purification tank (1), and a first separation membrane (14) is movably connected to the upper end of the first positioning ring (8), and a second separation membrane (15) is movably connected to the lower end of the second positioning ring (9), and a third separation membrane (16) is movably connected to the upper end of the third positioning ring (13). The lower purification tank (1) is provided with an annular groove (17), and the annular groove (1 7) is located below the third positioning ring (13), a disc (18) is rotatably connected in the annular groove (17), a motor (19) is fixedly connected to the upper end of the bottom of the electromagnetic stirring box (3), a cross bar (20) is fixedly connected to the upper end of the motor (19), a magnet (21) symmetrically arranged on the left and right is fixedly connected to the upper end of the cross bar (20), a stirrer (22) is arranged at the lower end of the bottom of the lower purification tank (1), an upper water baffle (23) and a lower water baffle (24) are fixedly connected in sequence from top to bottom in the lower purification tank (1), a liquid filling valve (35) and a liquid discharge valve (36) are fixedly connected to the right end of the lower purification tank (1) from top to bottom, The liquid adding valve (35) is installed below the upper water baffle plate (23), and the upper water baffle plate (23) is installed below the disc (18). The upper water baffle plate (23) and the lower water baffle plate (24) are provided with through holes (25) aligned up and down, and a connecting rod (26) is inserted into the through hole (25). The first limiting groove (10), the second limiting groove (11) and the third limiting groove (12) are all fixedly connected with limiting springs (27), and the outer side of the limiting spring (27) is fixedly connected with a limiting block (28), and the limiting block (28) is snap-fittedly connected with the first separation membrane (14), the second separation membrane (15) and the third separation membrane (16).

2. A carbon dioxide removal device for improving biogas purity according to claim 1, characterized in that: The upper end of the lower purification tank (1) and the lower end of the upper purification tank (2) are both provided with a groove (29), a sealing ring (30) is fixedly connected in the groove (29), the heights of the groove (29) and the sealing ring (30) are equal, the upper end of the upper sealing cover (5) is fixedly connected with a methane outlet valve (31) and a carbon dioxide outlet valve (32) in sequence from left to right, and the inner diameter and outer diameter of the lower purification tank (1) and the upper purification tank (2) are equal.

3. A carbon dioxide removal device for improving biogas purity according to claim 1, characterized in that: The left end of the lower purification tank (1) is provided with a material changing port (33) which is in communication with the annular groove (17); the lower end of the material changing port (33) is flush with the lower end of the annular groove (17); a detachable material changing cover (34) is fixedly connected to the outer side of the material changing port (33); and the area of ​​the material changing port (33) is smaller than the area of ​​the material changing cover (34).

4. A carbon dioxide removal device for improving biogas purity according to claim 1, characterized in that: The upper end of the disc (18) is rotatably connected to a rotating rod (37), and the outer side of the rotating rod (37) is fixedly connected to an annular partition plate (38) distributed at equal intervals. Clinoptilolite (39) is arranged at intervals on the upper end of the disc (18), and the disc (18) is of hollow design.

5. The device for removing carbon dioxide for improving the purity of biogas according to claim 1, characterized in that: The upper end of the stirring rod (22) is provided with a slot (40), the lower end of the connecting rod (26) is fixedly connected with a block (41), the block (41) and the slot (40) are snap-fitted, and the upper end of the connecting rod (26) is connected to the lower end of the disc (18).

6. A carbon dioxide removal device for improving biogas purity according to claim 1, characterized in that: The first limiting groove (10), the second limiting groove (11) and the third limiting groove (12) are of the same specifications.

7. The device for removing carbon dioxide for improving the purity of biogas according to claim 1, characterized in that: The pore sizes of the first separation membrane (14), the second separation membrane (15) and the third separation membrane (16) decrease in sequence.

8. The device for removing carbon dioxide for improving the purity of biogas according to claim 1, characterized in that: The annular groove (17), the disc (18), the motor (19), the stirrer (22), the through hole (25) and the connecting rod (26) are in a concentric circle structure. Two magnets (21) are provided, and the magnetism of the magnet (21) and the other magnet (21) are opposite.

9. The device for removing carbon dioxide for improving the purity of biogas according to claim 1, characterized in that: The upper water baffle plate (23) and the lower water baffle plate (24) are both designed to be inclined, and one end of the upper water baffle plate (23) and the lower water baffle plate (24) close to the center point of the lower purification tank (1) is lower than the other end of the upper water baffle plate (23) and the lower water baffle plate (24), and the length of the upper water baffle plate (23) and the lower water baffle plate (24) is greater than the radius of the lower purification tank (1).

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