Circulating type carbon dioxide dehumidification and desulfurization system and method

Abstract

The invention discloses a circulating type carbon dioxide dehumidification and desulfurization system and method in the technical field of carbon dioxide dehumidification and desulfurization. The circulating type carbon dioxide dehumidification and desulfurization system comprises a desulfurization box, and a calcium hydroxide solution is stored in the desulfurization box; in the process of dehumidifying and desulfurizing carbon dioxide, the stirring shaft and the stirring blades are used for stirring a calcium hydroxide solution, the contact area of the carbon dioxide and the calcium hydroxide solution is increased, the moving distance of the carbon dioxide can be increased by using an S-shaped path formed by the multiple conveying belts, and the carbon dioxide can be more sufficiently dehumidified and desulfurized. In addition, a certain height difference exists between the multiple conveying belts, and the calcium oxide powder can be scattered when falling down; and a bearing plate is utilized, and the bearing plate can move downwards, so that sulfide precipitates in the desulfurization box can move downwards in the process that reactants in the desulfurization box are gradually increased, and the sulfide precipitates in the desulfurization box can be far away from stirring blades.

Description

Technical Field

[0001] The present invention relates to the technical field of carbon dioxide dehumidification and desulfurization, and in particular to a circulating carbon dioxide dehumidification and desulfurization system and method. Background Art

[0002] Carbon dioxide is well known to the world as a greenhouse gas that affects the climate, but it is also an important carbon resource and is widely used in many fields such as chemical industry, machinery, food, medicine and agriculture. For example, in the food field, it is often used for food freezing, beverage carbonation and tobacco expansion, etc.; therefore, it has become a research topic increasingly. Among them, purifying the carbon dioxide produced in the industrial production process to make food-grade carbon dioxide has become a major research direction, which can not only alleviate the greenhouse effect, but also benefit the development of the food industry; in the preparation process of carbon dioxide, sulfides are usually mixed in the carbon dioxide, so to obtain pure carbon dioxide usually requires a desulfurization process, and a desulfurizer is often used in the desulfurization process; the commonly used methods for removing sulfur-containing impurities are mainly hydrodesulfurization, oxidative desulfurization and adsorption desulfurization.

[0003] In the process of preparing carbon dioxide in the prior art, sulfides will be mixed in the carbon dioxide, and it is usually necessary to treat the sulfides in the carbon dioxide. The carbon dioxide will be introduced into a treatment liquid for treatment. The treated carbon dioxide will contain a high content of water vapor. The carbon dioxide needs to be dehumidified before use. In the process of treating the sulfides in the carbon dioxide, the substances in the treatment liquid will be continuously consumed, and it is necessary to add treatment liquid thereto. Usually, there will be a stirring device inside the treatment liquid to stir and accelerate the treatment. After a period of treatment, sulfide precipitation will occur in the treatment liquid. The stirring device usually cannot be moved. When the precipitation in the treatment liquid increases, the stirring device will stir the precipitation, resulting in a poor desulfurization effect. Summary of the invention

[0004] The object of the present invention is to provide a circulating carbon dioxide dehumidification and desulfurization system and method to solve the problems raised in the above background technology.

[0005] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a circulating carbon dioxide dehumidification and desulfurization system, comprising a desulfurization box, wherein a calcium hydroxide solution is stored in the desulfurization box, the surface of the desulfurization box is connected to an air inlet pipe, the air inlet pipe extends to the interior of the desulfurization box, an addition door is elastically hinged on the surface of the desulfurization box, a stirring mechanism is provided inside the desulfurization box, the stirring mechanism is used to stir the calcium hydroxide solution inside the desulfurization cylinder, the desulfurization box is connected to a dehumidification box on the side away from the air inlet pipe, a connecting port is provided between the dehumidification box and the desulfurization box, an air outlet pipe is provided on the upper end surface of the dehumidification box, a dehumidification mechanism is provided inside the desulfurization box, the dehumidification mechanism is used to remove water vapor in carbon dioxide by using calcium oxide, a replenishing mechanism is provided between the dehumidification box and the desulfurization box, the replenishing mechanism is used to replenish the calcium hydroxide converted from the calcium oxide in the dehumidification mechanism after absorbing water vapor to the interior of the desulfurization box, and a downward moving mechanism is provided inside the desulfurization box, the downward moving mechanism is used to move downward when the mass of the reactants in the desulfurization box gradually increases.

[0006] As a further solution of the present invention, the stirring mechanism includes a driving motor, which is fixedly mounted on the surface of the desulfurization box. The end of the output shaft of the driving motor is fixedly connected to a stirring shaft, which passes through the desulfurization box and extends to the interior of the desulfurization box. A plurality of equidistantly arranged stirring blades are fixedly connected to the surface of the stirring shaft.

[0007] As a further solution of the present invention, the dehumidification mechanism includes an adding pipe, which is fixedly connected to the surface of the dehumidification box. The adding pipe is used to add calcium oxide powder into the dehumidification box. There are multiple groups of conveying shafts rotatably connected inside the dehumidification box. The surfaces of the conveying shafts in the same group are all transmission-connected with conveyor belts. The multiple conveyor belts are staggered left and right, and the path formed by the multiple conveyor belts is S-shaped.

[0008] As a further solution of the present invention, the replenishing mechanism includes a connecting pipe, which is connected to the bottom of the dehumidification box, and the end of the connecting pipe is located below the end position of the conveyor belt. The connecting pipe is connected to the side of the desulfurization box away from the dehumidification box, and the connecting pipe is arranged at an angle.

[0009] As a further solution of the present invention, the downward movement mechanism includes a receiving plate, the receiving plate elastically slides inside the desulfurization box, the receiving plate is slidably sealed with the inside of the desulfurization box, and the receiving plate is located below the stirring blade.

[0010] As a further solution of the present invention, an extension pipe is fixedly connected to the inside of the desulfurization box at a position corresponding to the connecting port, and a plurality of corrugated plates are fixedly connected to the inside of the extension pipe, and the plurality of corrugated plates are staggered up and down.

[0011] As a further solution of the present invention, the air inlet pipe extends to a position between the receiving plate and the stirring blade, and one end of the air inlet pipe located inside the desulfurization box is fixedly connected to a dispersion pipe, and a plurality of exhaust holes are provided on the surface of the dispersion pipe.

[0012] As a further solution of the present invention, the surface of the conveying shaft is provided with a plurality of arc grooves arranged at equal angles, the inner wall surface of the dehumidification box is elastically slidably connected with a plurality of sliding plates, the plurality of sliding plates are respectively located at the inner side positions of a plurality of the conveying belts, the end of the sliding plate is in contact with the surface of the conveying shaft close to the S-shaped path side, and the arc grooves will cause the sliding plate to move during the rotation of the conveying shaft, and a plurality of pushing plates are fixedly connected to the bottom of the sliding plate, and the pushing plates are used to push the conveyor belts.

[0013] As a further solution of the present invention, a blocking plate is hingedly connected to the position of the connecting pipe inside the desulfurization box.

[0014] A circulating carbon dioxide dehumidification and desulfurization method, the specific steps of the method are as follows:

[0015] Step 1: In the process of desulfurization and dehumidification of carbon dioxide, carbon dioxide needs to be introduced into the desulfurization box through the air inlet pipe and desulfurized by calcium hydroxide solution;

[0016] Step 2: The stirring mechanism inside the desulfurization box will then stir the carbon dioxide and calcium hydroxide solution to increase the reaction rate;

[0017] Step 3: The desulfurized carbon dioxide will enter the dehumidification box through the connecting port, and the dehumidification mechanism will remove the water vapor in the carbon dioxide;

[0018] Step 4: During the dehumidification process of carbon dioxide, the replenishing mechanism will replenish the produced calcium hydroxide into the desulfurization box;

[0019] Step 5: When the reactants inside the desulfurization box gradually increase, the downward movement mechanism will drive the precipitation in the solution to move downward.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] 1. In the process of dehumidifying and desulfurizing carbon dioxide, the present invention utilizes a stirring shaft and a stirring blade to stir the calcium hydroxide solution, so that the introduced carbon dioxide can fully contact with the calcium hydroxide solution, increase the contact area, and improve the reaction efficiency. In addition, an S-shaped path composed of multiple conveyor belts can increase the moving distance of carbon dioxide, thereby increasing the contact time between carbon dioxide and calcium oxide, ensuring that the moisture in the carbon dioxide can be fully absorbed, and there is a certain height difference between the multiple conveyor belts, so that the calcium oxide powder can be scattered when it falls; and a receiving plate is utilized. In the process of gradually increasing calcium hydroxide and sulfide precipitation inside the desulfurization box, the receiving plate will gradually move downward under the action of gravity, which is conducive to the sulfide precipitation inside the desulfurization box. Move downward in the process of gradually increasing reactants inside the desulfurization box, and can keep the sulfide precipitation inside the desulfurization box away from the stirring blades, reduce the stirring of the sulfide precipitation inside the desulfurization box by the stirring blades, and avoid the sulfide precipitation inside the desulfurization box being stirred by the stirring blades, thereby reducing the sulfide treatment efficiency in the carbon dioxide.

[0022] 2. In the process of desulfurizing carbon dioxide in the present invention, the carbon dioxide will pass through the calcium hydroxide solution, and then the carbon dioxide will gradually move to the extension tube position and enter the extension tube. The carbon dioxide will move between the corrugated plates, and the corrugated plates can preliminarily remove the moisture contained in the carbon dioxide to avoid a high moisture content in the carbon dioxide. A high moisture content will consume more calcium oxide powder and affect the moisture content in the carbon dioxide after the final dehumidification, resulting in failure to achieve the expected effect.

[0023] 3. In the process of desulfurizing carbon dioxide in the present invention, the air intake pipe will transport the carbon dioxide to the inside of the desulfurization box, and then the air intake pipe will transport the carbon dioxide gas to the position of the dispersion pipe, and the carbon dioxide will be discharged through the exhaust holes on the surface of the dispersion pipe. The discharged carbon dioxide is relatively dispersed, which is conducive to allowing the carbon dioxide to disperse in the calcium hydroxide solution, increasing the contact area between the carbon dioxide gas and the calcium hydroxide solution, thereby improving the treatment efficiency of the sulfide in the carbon dioxide gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is a flow chart of the method of the present invention;

[0025] Figure 2 It is a schematic diagram of the overall structure of the present invention;

[0026] Figure 3 It is a schematic diagram of the overall structure of the present invention after being cut apart;

[0027] Figure 4 for Figure 3 Schematic diagram of the structure at A in the middle;

[0028] Figure 5 for Figure 3Schematic diagram of the structure at B in the middle;

[0029] Figure 6 This is a schematic diagram of the structure inside the desulfurization box of the present invention;

[0030] Figure 7 for Figure 6 Schematic diagram of the structure at C in the middle;

[0031] Figure 8 This is a schematic diagram of the structure inside the dehumidification box of the present invention;

[0032] Fig. 9 for Figure 8 Schematic diagram of the structure at point D in the middle.

[0033] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0034] 1-desulfurization box, 2-inlet pipe, 3-addition door, 4-dehumidification box, 5-connecting port, 6-exhaust pipe, 7-driving motor, 8-stirring shaft, 9-stirring blade, 10-addition pipe, 11-conveying shaft, 12-conveying belt, 13-connecting pipe, 14-receiving plate, 15-extension pipe, 16-corrugated plate, 17-dispersion pipe, 18-exhaust hole, 19-arc groove, 20-sliding plate, 21-moving plate, 22-blocking plate. DETAILED DESCRIPTION

[0035] 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.

[0036] See also Figure 1-Figure 9The present invention provides a technical solution: a circulating carbon dioxide dehumidification and desulfurization system, comprising a desulfurization box 1, wherein a calcium hydroxide solution is stored in the desulfurization box 1, the surface of the desulfurization box 1 is connected with an air inlet pipe 2, the air inlet pipe 2 extends into the desulfurization box 1, an adding door 3 is elastically hinged on the surface of the desulfurization box 1, a stirring mechanism is arranged inside the desulfurization box 1, and the stirring mechanism is used to stir the calcium hydroxide solution inside the desulfurization cylinder, the desulfurization box 1 is connected with a dehumidification box 4 on the side away from the air inlet pipe 2, a connecting port 5 is provided between the dehumidification box 4 and the desulfurization box 1, an air outlet pipe 6 is connected to the upper end surface of the dehumidification box 4, a dehumidification mechanism is arranged inside the dehumidification box 4, and the dehumidification mechanism is used to remove water vapor in carbon dioxide by using calcium oxide, a replenishing mechanism is arranged between the dehumidification box 4 and the desulfurization box 1, and the replenishing mechanism is used to replenish the calcium hydroxide converted by the calcium oxide in the dehumidification mechanism after absorbing water vapor into the desulfurization box 1, and a downward movement mechanism is arranged inside the desulfurization box 1, and the downward movement mechanism is used to move downward when the mass of the reactants in the desulfurization box 1 gradually increases;

[0037] The stirring mechanism includes a driving motor 7, which is fixedly mounted on the surface of the desulfurization box 1. The end of the output shaft of the driving motor 7 is fixedly connected to a stirring shaft 8, which penetrates the desulfurization box 1 and extends to the inside of the desulfurization box 1. A plurality of stirring blades 9 arranged equidistantly are fixedly connected to the surface of the stirring shaft 8.

[0038] The dehumidification mechanism includes an adding pipe 10, which is fixedly connected to the surface of the dehumidification box 4. The adding pipe 10 is used to add calcium oxide powder into the dehumidification box 4. The dehumidification box 4 is rotatably connected with multiple groups of conveying shafts 11. The surfaces of the same group of conveying shafts 11 are all connected with conveying belts 12. The multiple conveying belts 12 are staggered left and right, and the path formed by the multiple conveying belts 12 is S-shaped.

[0039] The replenishing mechanism includes a connecting pipe 13, which is connected to the bottom of the dehumidification box 4, and the end of the connecting pipe 13 is located below the end of the conveyor belt 12. The side of the connecting pipe 13 away from the dehumidification box 4 is connected to the side of the desulfurization box 1, and the connecting pipe 13 is inclined.

[0040] The downward movement mechanism includes a receiving plate 14, which elastically slides inside the desulfurization box 1, and the receiving plate 14 is slidably sealed with the inside of the desulfurization box 1, and the receiving plate 14 is located below the stirring blade 9;

[0041] In the process of dehumidifying and desulfurizing carbon dioxide, calcium hydroxide solution will be added to the desulfurization box 1 through the adding door 3, and the adding pipe 10 will add calcium oxide powder into the dehumidification box 4. The calcium oxide will fall on the surface of the conveyor belt 12, and then carbon dioxide gas will be introduced into the desulfurization box 1 through the air inlet pipe 2. The carbon dioxide will enter the calcium hydroxide solution, and the calcium hydroxide will react with the sulfide in the carbon dioxide to form a sulfide precipitate. The driving motor 7 will drive the stirring shaft 8 and the stirring blade 9 to stir the calcium hydroxide solution, so that the introduced carbon dioxide can fully contact with the calcium hydroxide solution, increase the contact area, and improve the reaction efficiency. Then the desulfurized carbon dioxide will enter through the connecting port 5. When it reaches the inside of the dehumidification box 4, the carbon dioxide will move along the S-shaped path formed by the multiple conveyor belts 12. The calcium oxide powder on the surface of the conveyor belt 12 will absorb the moisture in the carbon dioxide. The S-shaped path formed by the multiple conveyor belts 12 can increase the moving distance of the carbon dioxide, thereby increasing the contact time between the carbon dioxide and the calcium oxide, ensuring that the moisture in the carbon dioxide can be fully absorbed, and there is a certain height difference between the multiple conveyor belts 12, so that the calcium oxide powder can be scattered when falling, so that the calcium oxide powder can be dispersed when falling, avoiding the calcium oxide powder from always gathering on the surface of the conveyor belt 12. The calcium oxide powder in contact with the surface of the conveyor belt 12 cannot come into contact with the carbon dioxide, causing waste of the calcium oxide powder The calcium oxide powder cannot fully contact with the carbon dioxide, which affects the effect of removing moisture from the carbon dioxide. Subsequently, multiple conveyor belts 12 will convey the calcium oxide powder to the bottom of the dehumidification box 4. During the movement of the calcium oxide powder, the calcium oxide powder will react with the moisture in the carbon dioxide and be converted into calcium hydroxide. Subsequently, the conveyor belt 12 at the bottom will convey the converted calcium oxide powder to the connecting pipe 13. The converted calcium oxide powder will fall into the connecting pipe 13 and enter the desulfurization box 1 along the connecting pipe 13. The stirring shaft 8 and the stirring blades 9 will stir the powder that falls into the desulfurization box 1, so that the converted calcium oxide powder that falls into the desulfurization box 1 can quickly contact with the desulfurization box 1. The solution inside the box 1 is mixed, and the calcium hydroxide inside the desulfurization box 1 is replenished in time to ensure the treatment effect of sulfide in carbon dioxide and improve the desulfurization rate. In the process of gradually increasing calcium hydroxide and sulfide precipitation inside the desulfurization box 1, the receiving plate 14 will gradually move downward under the action of gravity, which is beneficial to make the sulfide precipitation inside the desulfurization box 1 move downward in the process of gradually increasing reactants inside the desulfurization box 1, and can make the sulfide precipitation inside the desulfurization box 1 away from the stirring blade 9, reduce the stirring of the sulfide precipitation inside the desulfurization box 1 by the stirring blade 9, avoid the sulfide precipitation inside the desulfurization box 1 being stirred by the stirring blade 9, thereby reducing the treatment efficiency of sulfide in carbon dioxide.

[0042] In the process of treating carbon dioxide, the water content of carbon dioxide when it comes out of the calcium hydroxide solution in the desulfurization box 1 is relatively high. As a further solution of the present invention, an extension pipe 15 is fixedly connected to the position corresponding to the connecting port 5 in the desulfurization box 1, and a plurality of corrugated plates 16 are fixedly connected to the extension pipe 15. The plurality of corrugated plates 16 are staggered up and down.

[0043] In the process of desulfurization of carbon dioxide, carbon dioxide will pass through the calcium hydroxide solution, and then the carbon dioxide will gradually move to the position of the extension tube 15 and enter the extension tube 15. The carbon dioxide will move between the corrugated plates 16, and the corrugated plates 16 can initially remove the moisture contained in the carbon dioxide to avoid a high moisture content in the carbon dioxide. A high moisture content will consume more calcium oxide powder and affect the moisture content in the carbon dioxide after the final dehumidification, resulting in failure to achieve the expected effect.

[0044] In the process of desulfurization of carbon dioxide, carbon dioxide will be transported to the inside of the desulfurization box 1 through the air intake pipe 2, and carbon dioxide will be relatively concentrated. As a further solution of the present invention, the air intake pipe 2 extends to the position between the receiving plate 14 and the stirring blade 9. The air intake pipe 2 is located inside the desulfurization box 1. One end thereof is fixedly connected to a dispersion pipe 17, and a plurality of exhaust holes 18 are opened on the surface of the dispersion pipe 17.

[0045] During the desulfurization process of carbon dioxide, the air intake pipe 2 will transport the carbon dioxide to the inside of the desulfurization box 1, and then the air intake pipe 2 will transport the carbon dioxide gas to the position of the dispersion pipe 17, and the carbon dioxide will be discharged through the exhaust holes 18 on the surface of the dispersion pipe 17. The discharged carbon dioxide is relatively dispersed, which is conducive to allowing the carbon dioxide to disperse in the calcium hydroxide solution, increasing the contact area between the carbon dioxide gas and the calcium hydroxide solution, thereby improving the treatment efficiency of the sulfide in the carbon dioxide gas.

[0046] In the process of treating carbon dioxide, the conveyor belt 12 will convey calcium oxide powder. After reacting with the moisture in carbon dioxide, the calcium oxide powder is easily attached to the surface of the conveyor belt 12 and is difficult to separate from the conveyor belt 12. As a further solution of the present invention, a plurality of arc grooves 19 arranged at equal angles are opened on the surface of the conveyor shaft 11, and a plurality of sliding plates 20 are elastically slidably connected to the inner wall surface of the dehumidification box 4. The plurality of sliding plates 20 are respectively located at the inner side positions of the plurality of conveyor belts 12, and the end of the sliding plate 20 is in contact with the surface of the conveyor shaft 11 close to the S-shaped path. During the rotation of the conveyor shaft 11, the arc groove 19 will cause the sliding plate 20 to move, and a plurality of push plates 21 are fixedly connected to the bottom of the sliding plate 20, and the push plates 21 are used to push the conveyor belt 12;

[0047] During the treatment of carbon dioxide, the conveyor belt 12 will convey the calcium oxide powder. When the calcium oxide powder moves to the end position of the conveyor belt 12, the conveying shaft 11 rotates to cause the arc groove 19 to act on the sliding plate 20 to move back and forth. The sliding plate 20 will drive the push plate 21 to move together. The push plate 21 will lift the bottom of the conveyor belt 12 and move back and forth, which is conducive to the separation of the calcium oxide powder that has moved to the bottom of the conveyor belt 12 and cannot be separated from the conveyor belt 12, thereby ensuring the transportation of the calcium oxide powder and preventing the calcium oxide powder from adhering to the surface of the conveyor belt 12, thereby affecting the subsequent calcium oxide powder and the absorption of water in the carbon dioxide.

[0048] In the process of desulfurizing carbon dioxide, the gas inside the desulfurization box 1 will enter the dehumidification box 4 through the connecting pipe 13. As a further solution of the present invention, a blocking plate 22 is hingedly connected to the position of the connecting pipe 13 inside the desulfurization box 1;

[0049] During the desulfurization process of carbon dioxide, the blocking plate 22 will block the connecting pipe 13 to prevent carbon dioxide from entering the desulfurization box 1 from the connecting pipe 13. When the converted calcium oxide powder in the dehumidification box 4 enters the connecting pipe and gathers to a certain weight, the blocking plate 22 will open to allow the gathered converted calcium oxide powder to enter the desulfurization box 1, thereby reducing the carbon dioxide in the desulfurization box 1 from entering the dehumidification box 4 through the connecting pipe 13.

[0050] A circulating carbon dioxide dehumidification and desulfurization method, the specific steps of the method are as follows:

[0051] Step 1: In the process of desulfurization and dehumidification of carbon dioxide, it is necessary to introduce carbon dioxide into the desulfurization box 1 through the air inlet pipe 2 and desulfurize it using calcium hydroxide solution;

[0052] Step 2: Then the stirring mechanism inside the desulfurization box 1 will stir the carbon dioxide and calcium hydroxide solution to increase the reaction rate;

[0053] Step 3: The desulfurized carbon dioxide will enter the dehumidification box 4 through the connecting port 5, and the dehumidification mechanism will remove the water vapor in the carbon dioxide;

[0054] Step 4: During the process of dehumidifying carbon dioxide, the replenishing mechanism will replenish the produced calcium hydroxide into the desulfurization box 1;

[0055] Step 5: When the reactants inside the desulfurization box 1 gradually increase, the downward movement mechanism will drive the precipitation in the solution to move downward together.

[0056] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0057] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A circulating carbon dioxide dehumidification and desulfurization system, comprising a desulfurization box (1), characterized in that: The desulfurization box (1) stores calcium hydroxide solution inside. The surface of the desulfurization box (1) is connected to an air intake pipe (2). The air intake pipe (2) extends into the desulfurization box (1). The surface of the desulfurization box (1) is elastically hinged with an addition door (3). The desulfurization box (1) is provided with a stirring mechanism inside. The stirring mechanism is used to stir the calcium hydroxide solution inside the desulfurization cylinder. The desulfurization box (1) is connected to a dehumidification box (4) on the side away from the air intake pipe (2). A connecting port (5) is provided between the dehumidification box (4) and the desulfurization box (1). The upper end surface of the dehumidifying box (4) is connected to an air outlet pipe (6). A dehumidifying mechanism is provided inside the dehumidifying box (4). The dehumidifying mechanism is used to remove water vapor in carbon dioxide using calcium oxide. A replenishing mechanism is provided between the dehumidifying box (4) and the desulfurization box (1). The replenishing mechanism is used to replenish the desulfurization box (1) with calcium hydroxide converted from the calcium oxide in the dehumidifying mechanism after absorbing water vapor. A downward movement mechanism is provided inside the desulfurization box (1). The downward movement mechanism is used to move downward when the mass of the reactants inside the desulfurization box (1) gradually increases.

2. A circulating carbon dioxide dehumidification and desulfurization system according to claim 1, characterized in that: The stirring mechanism comprises a driving motor (7), the driving motor (7) is fixedly mounted on the surface of the desulfurization box (1), the end of the output shaft of the driving motor (7) is fixedly connected to a stirring shaft (8), the stirring shaft (8) passes through the desulfurization box (1) and extends to the interior of the desulfurization box (1), and a plurality of stirring blades (9) arranged at equal distances are fixedly connected to the surface of the stirring shaft (8).

3. A circulating carbon dioxide dehumidification and desulfurization system according to claim 1, characterized in that: The dehumidification mechanism comprises an addition pipe (10), wherein the addition pipe (10) is fixedly connected to the surface of the dehumidification box (4), and the addition pipe (10) is used to add calcium oxide powder into the dehumidification box (4). The dehumidification box (4) has multiple groups of conveying shafts (11) rotatably connected inside, and the surfaces of the conveying shafts (11) in the same group are all connected to conveyor belts (12) in a transmission manner. The multiple conveyor belts (12) are arranged in a staggered manner on the left and right, and the path formed by the multiple conveyor belts (12) is S-shaped.

4. A circulating carbon dioxide dehumidification and desulfurization system according to claim 3, characterized in that: The replenishing mechanism comprises a connecting pipe (13), wherein the connecting pipe (13) is connected to the bottom of the dehumidification box (4), the end of the connecting pipe (13) is located below the end of the conveyor belt (12), the connecting pipe (13) is connected to the side of the desulfurization box (1) away from the dehumidification box (4), and the connecting pipe (13) is arranged at an angle.

5. A circulating carbon dioxide dehumidification and desulfurization system according to claim 2, characterized in that: The downward movement mechanism comprises a receiving plate (14), the receiving plate (14) elastically slides inside the desulfurization box (1), the receiving plate (14) is slidably sealed with the inside of the desulfurization box (1), and the receiving plate (14) is located below the stirring blade (9).

6. A circulating carbon dioxide dehumidification and desulfurization system according to claim 1, characterized in that: An extension pipe (15) is fixedly connected to the desulfurization box (1) at a position corresponding to the connecting port (5), and a plurality of corrugated plates (16) are fixedly connected to the extension pipe (15). The plurality of corrugated plates (16) are arranged in an up-and-down staggered manner.

7. A circulating carbon dioxide dehumidification and desulfurization system according to claim 5, characterized in that: The air inlet pipe (2) extends to a position between the receiving plate (14) and the stirring blade (9); one end of the air inlet pipe (2) located inside the desulfurization box (1) is fixedly connected to a dispersion pipe (17); a plurality of exhaust holes (18) are provided on the surface of the dispersion pipe (17).

8. A circulating carbon dioxide dehumidification and desulfurization system according to claim 3, characterized in that: The surface of the conveying shaft (11) is provided with a plurality of arcuate grooves (19) arranged at equal angles. The inner wall surface of the dehumidifying box (4) is elastically slidably connected with a plurality of sliding plates (20). The plurality of sliding plates (20) are respectively located at the inner side positions of the plurality of conveying belts (12). The end of the sliding plate (20) is in contact with the surface of the conveying shaft (11) close to the S-shaped path. During the rotation of the conveying shaft (11), the arcuate grooves (19) will cause the sliding plate (20) to move. The bottom of the sliding plate (20) is fixedly connected with a plurality of pushing plates (21), and the pushing plates (21) are used to push the conveying belt (12).

9. A circulating carbon dioxide dehumidification and desulfurization system according to claim 4, characterized in that: A blocking plate (22) is hingedly connected inside the desulfurization box (1) at a position corresponding to the connecting pipe (13).

10. A circulating carbon dioxide dehumidification and desulfurization method, applicable to a circulating carbon dioxide dehumidification and desulfurization system according to any one of claims 1 to 9, characterized in that: The specific steps of this method are as follows: Step 1: In the process of desulfurizing and dehumidifying carbon dioxide, the carbon dioxide needs to be introduced into the desulfurization box (1) through the air inlet pipe (2) and desulfurized using calcium hydroxide solution; Step 2: The stirring mechanism inside the desulfurization box (1) then stirs the carbon dioxide and calcium hydroxide solution to increase the reaction rate; Step 3: The desulfurized carbon dioxide will enter the dehumidification box (4) through the connecting port (5), and the dehumidification mechanism will remove the water vapor in the carbon dioxide; Step 4: During the process of dehumidifying the carbon dioxide, the replenishing mechanism will replenish the produced calcium hydroxide into the desulfurization box (1); Step 5: When the reactants in the desulfurization box (1) gradually increase, the downward movement mechanism will drive the precipitate in the solution to move downward together.

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