Sludge dewatering device and dewatering process based on carbon dioxide hydrate

Abstract

The invention belongs to the technical field of sludge dewatering, and particularly relates to a sludge dewatering device and dewatering process based on carbon dioxide hydrate.The sludge dewatering device comprises a reaction chamber, a material turning assembly is rotationally installed in the reaction chamber and comprises a large rotating shaft, a fixed plate and a rotating plate, the fixed plate is fixedly installed on the large rotating shaft, and a small rotating shaft is rotationally installed in the large rotating shaft; a rotating plate is fixedly mounted on the small rotating shaft. A stirring assembly is replaced by the material turning assembly, so that the damage of the device to a sludge structure is reduced, the damage to carbon dioxide hydrate is avoided, and the mixing reaction rate of carbon dioxide and water in sludge is increased; specifically, a gear is pushed to move through an air cylinder, a telescopic head in a transmission ring abuts against a pressing block, a motor rotates to compress a force storage spring and drives a rotating plate to rotate, at the moment, the space in an expansion cavity is increased, the space in a pressing cavity is small, the rotating plate extrudes and crushes sludge in the pressing cavity, and the situation that the sludge is hardened due to the low-temperature environment in the reaction chamber is avoided.

Description

Technical Field

[0001] The invention belongs to the technical field of sludge dehydration, and in particular relates to a sludge dehydration device and a dehydration process based on carbon dioxide hydrate. Background Art

[0002] Among the existing sludge dehydration technologies, there is an efficient and environmentally friendly method of using carbon dioxide hydrate for sludge dehydration. This method mainly forms solid carbon dioxide hydrate by reacting supercritical carbon dioxide with sludge and liquid carbon dioxide under low temperature and high pressure environment, thereby effectively separating water from sludge.

[0003] Supercritical carbon dioxide (scCO2) refers to carbon dioxide whose temperature and pressure exceed the critical point (31.1 degrees Celsius, 7.39 MPa). The surface tension of carbon dioxide in the supercritical state is zero, which can penetrate into the tiny pores of sludge and replace the water contained in it.

[0004] The sludge dehydration process in the prior art mainly mixes carbon dioxide with sludge through a stirring device, such as the Chinese patent with publication number CN117164211B. Since stirring will shear the sludge and cause it to diffuse, the stirring device will cause certain damage to the structure of the sludge, affecting subsequent processing and utilization; at the same time, solid carbon dioxide hydrates are easily broken up by the stirring device, slowing down the mixing reaction rate of carbon dioxide and water in the sludge. Summary of the invention

[0005] The purpose of the present invention is to provide a sludge dehydration device and a dehydration process based on carbon dioxide hydrate to solve the technical problems in the prior art in view of the shortcomings of the prior art.

[0006] The object of the present invention can be achieved through the following technical scheme: a sludge dehydration device based on carbon dioxide hydrate, which includes a reaction chamber, a liquid inlet and an exhaust port are respectively installed on the reaction chamber, a feed port and a discharge port are respectively installed on the top and bottom of the reaction chamber, the feed port and the discharge port are respectively connected to the upper cover plate and the lower baffle plate, a material turning assembly is rotatably installed in the reaction chamber, the material turning assembly includes a large rotating shaft, a fixed plate and a rotating plate, the large rotating shaft is installed in the reaction chamber, the fixed plate is fixedly installed on the large rotating shaft, a small rotating shaft is rotatably installed in the large rotating shaft, the rotating plate is fixedly installed on the small rotating shaft, a transmission assembly is installed outside the reaction chamber, and the transmission assembly drives the large rotating shaft and the small rotating shaft to rotate respectively.

[0007] As a further optimization or improvement of the present solution, the material turning assembly further includes a folding baffle, a rotating cavity is provided on the large rotating shaft, a rotating plate is located in the rotating cavity and rotates, and the rotating plate is connected to the large rotating shaft via the folding baffle.

[0008] As a further optimization or improvement of this solution, the transmission assembly includes a motor, a gear and a transmission ring. A rotating sleeve is installed at the output end of the motor, a cylinder is installed in the rotating sleeve, the output end of the cylinder is connected to the gear, a transmission ring is coaxially installed on the gear, and a telescopic head is installed in the transmission ring.

[0009] As a further optimization or improvement of the present solution, the material turning assembly also includes a connecting sleeve, which is arranged on the small rotating shaft and fixedly connected to the large rotating shaft, and an internal tooth is installed in the connecting sleeve, and the gear meshes with the internal tooth.

[0010] As a further optimization or improvement of the present solution, a pressure block is fixedly installed on the small rotating shaft, a fixed block is fixedly installed inside the connecting sleeve, the pressure block is connected to the fixed block via a force storage spring, and the telescopic head abuts against the pressure block.

[0011] As a further optimization or improvement of this solution, the rotating plate is connected to the large rotating shaft via a return spring.

[0012] As a further optimization or improvement of this solution, an insulation barrel is installed outside the reaction chamber, and support legs are installed at the bottom of the insulation barrel.

[0013] As a further optimization or improvement of the present scheme, the reaction chamber includes an expansion chamber and a pressure chamber. The fixed plate and the rotating plate separate the reaction chamber into two pressure chambers and two expansion chambers. The two pressure chambers and the two expansion chambers are symmetrical along the large rotation axis, and each pressure chamber and expansion chamber is filled with an equal amount of sludge.

[0014] A sludge dehydration process based on carbon dioxide hydrate, the process is applied to the sludge dehydration device as described above, and the method comprises the following steps: Step S1: Pour the pretreated sludge into the feed port, cover the upper cover plate, start the motor, and the motor drives the fixed plate and the rotating plate to rotate synchronously through the meshing of the gears and the internal teeth, so that the sludge will evenly enter the expansion chamber and the pressure chamber; Step S2: injecting liquid carbon dioxide into the liquid inlet. When the pressure of the reaction chamber reaches a certain value, continue to introduce liquid carbon dioxide, and at the same time, discharge the gaseous carbon dioxide inside the reaction chamber from the exhaust port. As the large shaft rotates, the liquid carbon dioxide entering the reaction chamber cools down the sludge inside the expansion chamber and the pressure chamber one by one. Step S3: When the temperature in the reaction chamber reaches a certain value, the exhaust port is closed to stop the discharge of gaseous carbon dioxide, and liquid carbon dioxide is continuously injected to increase the pressure in the reaction chamber; Step S4: When the temperature and pressure inside the reaction chamber meet the conditions for generating carbon dioxide hydrate, the cylinder is started, and the cylinder pushes the gear to move, so that the gear is out of mesh with the internal teeth. At the same time, the telescopic head inside the transmission ring abuts against the pressure block. As the motor rotates, the motor drives the small rotating shaft and the pressure block thereon to rotate and compress the force storage spring through the transmission ring and the telescopic head thereon. The small rotating shaft drives the rotating plate thereon to rotate. At this time, the space inside the expansion chamber increases, and the space inside the pressure chamber is less. The rotating plate squeezes the sludge in the pressure chamber to crush it. Step S5: After the water in the sludge inside the reaction chamber completely forms carbon dioxide hydrate, the pressure in the reaction chamber is stable, that is, the carbon dioxide pressure is stable, indicating that the sludge reaction in the reaction chamber is completed, the exhaust port is opened to discharge the carbon dioxide inside the reaction chamber, and then the sludge is discharged from the discharge port.

[0015] As a further optimization or improvement of this solution, step S4 specifically includes the following steps: Step S41: As the small rotating shaft rotates, when the force storage spring is compressed to the limit, the telescopic head retracts and separates from the pressing block. At this time, the force storage spring drives the rotating plate to rotate through the pressing block, thereby driving the sludge in the expansion chamber to be lifted and turned over; Step S42: As the internal space of the expansion chamber increases, the sludge in the turning process can be mixed with a sufficient amount of carbon dioxide.

[0016] Beneficial effects of the present invention: The present invention replaces the stirring component with the turning component, thereby reducing the damage to the sludge structure of the device, avoiding the damage to the carbon dioxide hydrate, and increasing the mixing reaction rate of carbon dioxide and water in the sludge; specifically, the gear is pushed to move by the cylinder to disengage the gear from the meshing with the internal teeth, and at the same time, the telescopic head inside the transmission ring abuts against the pressure block, and as the motor rotates, the motor compresses the force storage spring and drives the rotating plate to rotate. At this time, the space inside the expansion chamber increases, and the space inside the pressure chamber is less. The rotating plate squeezes the sludge in the pressure chamber and crushes it, thereby avoiding the low temperature environment inside the reaction chamber causing the sludge to harden; In addition, the space inside the expansion chamber increases. Under the same conditions, the sludge inside the expansion chamber can contact more carbon dioxide. When the force storage spring is compressed to the limit, the telescopic head retracts and separates from the pressure block. At this time, the force storage spring drives the rotating plate to rotate through the pressure block, thereby driving the sludge in the expansion chamber to be lifted up and turned over. Due to the increase in the internal space of the expansion chamber, the sludge can be mixed with sufficient carbon dioxide during the lifting process, thereby improving the combination efficiency of water and carbon dioxide in the sludge. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present invention will be further described below in conjunction with the accompanying drawings.

[0018] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0019] Figure 2 It is a schematic diagram of the overall structure explosion diagram of the present invention.

[0020] Figure 3 Schematic diagram of the internal structure of the reaction chamber.

[0021] Figure 4 This is a cross-sectional view of the internal structure of the reaction chamber.

[0022] Figure 5 for Figure 4 A magnified view of the structure of part A.

[0023] Figure 6 This is the structural coordination diagram of the transmission component and the turning component.

[0024] Figure 7 It is a schematic diagram of the structure of the turning component.

[0025] Figure 8 for Figure 7 Enlarged view of the structure of part B.

[0026] Fig. 9 It is a schematic diagram of the transmission component structure.

[0027] Fig.10 Schematic diagram of the distribution of expansion chamber and pressure chamber.

[0028] The following are marked in the figure: 1. Insulation barrel; 2. Liquid inlet; 3. Exhaust port; 4. Support leg; 5. Transmission assembly; 51. Motor; 52. Rotating sleeve; 53. Cylinder; 54. Gear; 55. Transmission ring; 56. Telescopic head; 57. Internal gear; 58. Fixed block; 59. Storage spring; 6. Turning assembly; 61. Large rotating shaft; 62. Fixed plate; 63. Rotating plate; 64. Folding baffle; 65. Reset spring; 66. Rotating chamber; 67. Small rotating shaft; 68. Connecting sleeve; 69. Pressing block; 7. Feed inlet; 8. Discharge port; 9. Lower baffle; 10. Upper cover plate; 11. Reaction chamber; 1101. Expansion chamber; 1102. Pressure chamber. DETAILED DESCRIPTION

[0029] 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.

[0030] See also Figure 1-Figure 8A sludge dehydration device based on carbon dioxide hydrate includes a reaction chamber 11, on which a liquid inlet 2 and an exhaust port 3 are respectively installed, a feed port 7 and a discharge port 8 are respectively installed on the top and bottom of the reaction chamber 11, the feed port 7 and the discharge port 8 are respectively connected to an upper cover plate 10 and a lower baffle plate 9, a material turning component 6 is rotatably installed in the reaction chamber 11, and the material turning component 6 includes a large rotating shaft 61, a fixed plate 62 and a rotating plate 63, the large rotating shaft 61 is installed in the reaction chamber 11, the fixed plate 62 is fixedly installed on the large rotating shaft 61, a small rotating shaft 67 is rotatably installed in the large rotating shaft 61, and a rotating plate 63 is fixedly installed on the small rotating shaft 67, a transmission component 5 is installed outside the reaction chamber 11, and the transmission component 5 drives the large rotating shaft 61 and the small rotating shaft 67 to rotate respectively.

[0031] For details, see Fig.10 As shown, the reaction chamber 11 includes an expansion chamber 1101 and a pressure chamber 1102. The fixed plate 62 and the rotating plate 63 separate the reaction chamber 11 into two pressure chambers 1102 and two expansion chambers 1101. The two pressure chambers 1102 and the two expansion chambers 1101 are symmetrical along the large rotating axis 61, and each pressure chamber 1102 and expansion chamber 1101 are filled with an equal amount of sludge.

[0032] Before using the present invention, it is necessary to pour the pretreated sludge into the feed port 7, cover the upper cover plate 10, start the motor 51, and the motor 51 drives the fixed plate 62 and the rotating plate 63 to rotate synchronously through the meshing of the gear 54 and the internal gear 57, so that the sludge is distributed equally between the fixed plate 62 and the rotating plate 63. Then, liquid carbon dioxide is injected into the liquid inlet 2. When the pressure of the reaction chamber 11 reaches a certain value, liquid carbon dioxide is continuously introduced, and the gaseous carbon dioxide inside the reaction chamber 11 is discharged from the exhaust port 3 at the same time. As the large rotating shaft 61 rotates, the liquid carbon dioxide entering the reaction chamber 11 cools down the sludge between the fixed plate 62 and the rotating plate 63 one by one. When the temperature inside the reaction chamber 11 reaches a certain value, the exhaust port 3 is closed, the discharge of gaseous carbon dioxide is stopped, and liquid carbon dioxide is continuously injected to increase the pressure inside the reaction chamber 11, so that the temperature and pressure inside the reaction chamber 11 meet the conditions for generating carbon dioxide hydrate.

[0033] See also Figure 4-Figure 5 The material turning assembly 6 also includes a folding baffle 64 . A rotating cavity 66 is provided on the large rotating shaft 61 . The rotating plate 63 is located in the rotating cavity 66 and rotates. The rotating plate 63 is connected to the large rotating shaft 61 through the folding baffle 64 .

[0034] Specifically, the rotating plate 63 is connected to the large rotating shaft 61 via a return spring 65 .

[0035] It should be noted that the purpose of the folding baffle 64 is to block the sludge and prevent the sludge from entering the rotating chamber 66 and affecting the movement of the rotating plate 63 .

[0036] See also Figure 8-Figure 9 The transmission assembly 5 includes a motor 51, a gear 54 and a transmission ring 55. A rotating sleeve 52 is installed at the output end of the motor 51, a cylinder 53 is installed in the rotating sleeve 52, the output end of the cylinder 53 is connected to the gear 54, a transmission ring 55 is coaxially installed on the gear 54, and a telescopic head 56 is installed in the transmission ring 55.

[0037] Specifically, the material turning assembly 6 also includes a connecting sleeve 68 , which is sleeved on the small rotating shaft 67 and fixedly connected to the large rotating shaft 61 . The inner teeth 57 are installed in the connecting sleeve 68 , and the gear 54 is meshed with the inner teeth 57 .

[0038] Specifically, a pressing block 69 is fixedly installed on the small rotating shaft 67 , a fixing block 58 is fixedly installed inside the connecting sleeve 68 , the pressing block 69 is connected to the fixing block 58 via a force storage spring 59 , and the telescopic head 56 abuts against the pressing block 69 .

[0039] It should be noted that the environment for generating carbon dioxide hydrate is a low-temperature and high-pressure environment, so the sludge inside the reaction chamber 11 is easy to harden in a low-temperature environment.

[0040] Based on the above problems, the present invention starts the cylinder 53, which pushes the gear 54 to move, so that the gear 54 is out of mesh with the inner tooth 57. At the same time, the telescopic head 56 inside the transmission ring 55 abuts against the pressure block 69. As the motor 51 rotates, the motor 51 drives the small rotating shaft 67 and the pressure block 69 thereon to rotate and compress the storage spring 59 through the transmission ring 55 and the telescopic head 56 thereon. The small rotating shaft 67 drives the rotating plate 63 thereon to rotate. At this time, the space inside the expansion chamber 1101 increases, and the space inside the pressure chamber 1102 is less. See Fig.10 , the rotating plate 63 squeezes the sludge in the pressure chamber 1102 and crushes it, so as to prevent the low temperature environment inside the reaction chamber 11 from hardening the sludge, and the space inside the expansion chamber 1101 increases. Under the same conditions, the sludge inside the expansion chamber 1101 can contact more carbon dioxide. When the force storage spring 59 is compressed to the limit, the telescopic head 56 retracts and disengages from the pressing block 69. At this time, the force storage spring 59 drives the rotating plate 63 to rotate through the pressing block 69, thereby driving the sludge in the expansion chamber 1101 to be flipped up and turned over. Since the internal space of the expansion chamber 1101 is increased, the sludge can be mixed with a sufficient amount of carbon dioxide during the flipping process, thereby improving the efficiency of combining water and carbon dioxide in the sludge. The cylinder 53 continues to lift and lower, ensuring that the large rotating shaft 61 rotates while repeating the above operation. The present invention can alternately flip the sludge inside the expansion chamber 1101 and the pressure chamber 1102 by installing multiple sets of flipping components 6.

[0041] See also Figure 1The heat preservation barrel 1 is installed outside the reaction chamber 11, and the support legs 4 are installed at the bottom of the heat preservation barrel 1. It should be noted that the heat preservation barrel 1 can maintain the low temperature environment inside the reaction chamber 11 and improve the heat preservation effect of the reaction chamber 11.

[0042] See also Figure 4-Figure 10 As shown, the present invention is a sludge dehydration process based on carbon dioxide hydrate, the process is applied to the sludge dehydration device as described in the above embodiment, and the process includes the following steps: Step S1: Pour the pretreated sludge into the feed port 7, cover the upper cover plate 10, start the motor 51, and the motor 51 drives the fixed plate 62 and the rotating plate 63 to rotate synchronously through the meshing of the gear 54 and the inner gear 57, so that the sludge will evenly enter the expansion chamber 1101 and the pressure chamber 1102; Step S2: injecting liquid carbon dioxide into the liquid inlet 2. When the pressure of the reaction chamber 11 reaches a certain value, continue to introduce liquid carbon dioxide, and at the same time, discharge the gaseous carbon dioxide inside the reaction chamber 11 from the exhaust port 3. As the large rotating shaft 61 rotates, the liquid carbon dioxide entering the reaction chamber 11 cools down the sludge inside the expansion chamber 1101 and the pressure chamber 1102 one by one. Step S3: When the temperature in the reaction chamber 11 reaches a certain value, the exhaust port 3 is closed to stop the discharge of gaseous carbon dioxide, and liquid carbon dioxide is continuously injected to increase the pressure in the reaction chamber 11; Step S4: When the temperature and pressure inside the reaction chamber 11 meet the conditions for generating carbon dioxide hydrate, the cylinder 53 is started, and the cylinder 53 pushes the gear 54 to move, so that the gear 54 is out of mesh with the inner tooth 57. At the same time, the telescopic head 56 inside the transmission ring 55 abuts against the pressure block 69. As the motor 51 rotates, the motor 51 drives the small rotating shaft 67 and the pressure block 69 thereon to rotate and compress the force storage spring 59 through the transmission ring 55 and the telescopic head 56 thereon. The small rotating shaft 67 drives the rotating plate 63 thereon to rotate. At this time, the space inside the expansion chamber 1101 increases, and the space inside the pressure chamber 1102 is less. The rotating plate 63 squeezes the sludge in the pressure chamber 1102 to crush it. Step S5: After the water in the sludge in the reaction chamber 11 completely forms carbon dioxide hydrate, the pressure in the reaction chamber 11 is stable, that is, the carbon dioxide pressure is stable, indicating that the sludge reaction in the reaction chamber 11 is completed, and the exhaust port 3 is opened to discharge the carbon dioxide in the reaction chamber 11, and then the sludge is discharged from the discharge port 8.

[0043] like Figure 8-Figure 10 As shown, as a preferred embodiment of the present invention, step S4 specifically includes the following steps: Step S41: As the small rotating shaft 67 rotates, when the force storage spring 59 is compressed to the limit, the telescopic head 56 retracts and separates from the pressing block 69. At this time, the force storage spring 59 drives the rotating plate 63 to rotate through the pressing block 69, thereby driving the sludge in the expansion chamber 1101 to be lifted and turned over; Step S42: As the internal space of the expansion chamber 1101 increases, the sludge during the turning process can be mixed with a sufficient amount of carbon dioxide.

[0044] The implementation principle of the present invention is: Pour the pretreated sludge into the feed port 7, cover the upper cover plate 10, start the motor 51, and the motor 51 drives the large rotating shaft 61 to rotate as a whole through the engagement of the gear 54 and the inner gear 57. At this time, the large rotating shaft 61 drives the fixed plate 62 and the rotating plate 63 to rotate synchronously, and the sludge will evenly enter the expansion chamber 1101 and the pressure chamber 1102.

[0045] Liquid carbon dioxide is injected into the liquid inlet 2. When the temperature and pressure inside the reaction chamber 11 meet the conditions for generating carbon dioxide hydrate, the cylinder 53 is started. The cylinder 53 pushes the gear 54 to move, so that the gear 54 is disengaged from the inner tooth 57. At the same time, the telescopic head 56 inside the transmission ring 55 abuts against the pressure block 69. As the motor 51 rotates, the motor 51 drives the small rotating shaft 67 and the pressure block 69 thereon to rotate and compress the force storage spring 59 through the transmission ring 55 and the telescopic head 56 thereon. The small rotating shaft 67 drives the rotating plate 63 thereon to rotate. At this time, the space inside the expansion chamber 1101 increases, and the space inside the pressure chamber 1102 is reduced. See Fig.10 The rotating plate 63 squeezes the sludge in the pressure chamber 1102 and crushes it, thereby preventing the low temperature environment inside the reaction chamber 11 from hardening the sludge. The space inside the expansion chamber 1101 is increased. Under the same conditions, the sludge inside the expansion chamber 1101 can contact more carbon dioxide. When the force storage spring 59 is compressed to its limit, the telescopic head 56 retracts and separates from the pressure block 69. At this time, the force storage spring 59 drives the rotating plate 63 to rotate through the pressure block 69, thereby driving the sludge in the expansion chamber 1101 to be lifted up and turned over. Since the internal space of the expansion chamber 1101 is increased, the sludge can be mixed with a sufficient amount of carbon dioxide during the lifting process, thereby improving the combination efficiency of water and carbon dioxide in the sludge.

[0046] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, and these changes and improvements all fall within the scope of the present invention to be protected.

Claims

1. A sludge dehydration device based on carbon dioxide hydrate, Features: The invention comprises a reaction chamber (11), wherein a liquid inlet (2) and an exhaust port (3) are respectively mounted on the reaction chamber (11), a material inlet (7) and a material discharge port (8) are respectively mounted on the top and bottom of the reaction chamber (11), wherein the material inlet (7) and the material discharge port (8) are respectively connected to an upper cover plate (10) and a lower baffle plate (9), wherein a material turning assembly (6) is rotatably mounted in the reaction chamber (11), wherein the material turning assembly (6) comprises a large rotating shaft (61), a fixed plate (62) and a rotating plate (63), wherein the large rotating shaft (61) is mounted in the reaction chamber (11), wherein the fixed plate (62) is fixedly mounted on the large rotating shaft (61), wherein a small rotating shaft (67) is rotatably mounted in the large rotating shaft (61), wherein the rotating plate (63) is fixedly mounted on the small rotating shaft (67), and wherein a transmission assembly (5) is mounted on the outside of the reaction chamber (11), wherein the transmission assembly (5) drives the large rotating shaft (61) and the small rotating shaft (67) to rotate respectively.

2. A sludge dehydration device based on carbon dioxide hydrate according to claim 1, Features: The material turning assembly (6) further comprises a folding baffle (64); a rotating cavity (66) is provided on the large rotating shaft (61); the rotating plate (63) is located in the rotating cavity (66) and rotates; the rotating plate (63) is connected to the large rotating shaft (61) via the folding baffle (64).

3. A sludge dehydration device based on carbon dioxide hydrate according to claim 2, Features: The transmission assembly (5) comprises a motor (51), a gear (54) and a transmission ring (55); a rotating sleeve (52) is mounted on the output end of the motor (51); a cylinder (53) is mounted inside the rotating sleeve (52); an output end of the cylinder (53) is connected to the gear (54); a transmission ring (55) is coaxially mounted on the gear (54); and a telescopic head (56) is mounted inside the transmission ring (55).

4. A sludge dehydration device based on carbon dioxide hydrate according to claim 3, Features: The material turning assembly (6) further comprises a connecting sleeve (68), which is sleeved on the small rotating shaft (67) and fixedly connected to the large rotating shaft (61), and an internal tooth (57) is installed in the connecting sleeve (68), and the gear (54) meshes with the internal tooth (57).

5. A sludge dehydration device based on carbon dioxide hydrate according to claim 4, Features: A pressing block (69) is fixedly mounted on the small rotating shaft (67), a fixed block (58) is fixedly mounted inside the connecting sleeve (68), the pressing block (69) is connected to the fixed block (58) via a force storage spring (59), and the telescopic head (56) abuts against the pressing block (69).

6. A sludge dehydration device based on carbon dioxide hydrate according to claim 2, Features: The rotating plate (63) is connected to the large rotating shaft (61) via a return spring (65).

7. A sludge dehydration device based on carbon dioxide hydrate according to claim 1, Features: A heat preservation barrel (1) is installed outside the reaction chamber (11), and support legs (4) are installed at the bottom of the heat preservation barrel (1).

8. A sludge dehydration device based on carbon dioxide hydrate according to claim 1, Features: The reaction chamber (11) comprises an expansion chamber (1101) and a pressure chamber (1102); the fixed plate (62) and the rotating plate (63) separate the reaction chamber (111) into two pressure chambers (1102) and two expansion chambers (1101); the two pressure chambers (1102) and the two expansion chambers (1101) are symmetrical along the large rotating axis (61), and each pressure chamber (1102) and each expansion chamber (1101) are filled with an equal amount of sludge.

9. A sludge dehydration process based on carbon dioxide hydrate, It is characterized in that The process is applied to the sludge dewatering device as described in any one of claims 1 to 8 above, and the process comprises the following steps: Step S1: pour the pretreated sludge into the feed port (7), cover the upper cover plate (10), start the motor (51), and the motor (51) drives the fixed plate (62) and the rotating plate (63) to rotate synchronously through the meshing of the gear (54) and the internal gear (57), so that the sludge will evenly enter the expansion chamber (1101) and the pressure chamber (1102); Step S2: injecting liquid carbon dioxide into the liquid inlet (2); when the pressure of the reaction chamber (11) reaches a certain value, continue to introduce liquid carbon dioxide, and at the same time, discharge the gaseous carbon dioxide inside the reaction chamber (11) from the exhaust port (3); as the large rotating shaft (61) rotates, the liquid carbon dioxide that enters the reaction chamber (11) cools down the sludge inside the expansion chamber (1101) and the pressure chamber (1102) one by one; Step S3: when the temperature in the reaction chamber (11) reaches a certain value, the exhaust port (3) is closed to stop the discharge of gaseous carbon dioxide, and liquid carbon dioxide is continuously injected to increase the pressure in the reaction chamber (11); Step S4: When the temperature and pressure inside the reaction chamber (11) satisfy the conditions for generating carbon dioxide hydrate, the cylinder (53) is started, and the cylinder (53) pushes the gear (54) to move, so that the gear (54) is disengaged from the inner gear (57). At the same time, the telescopic head (56) inside the transmission ring (55) abuts against the pressing block (69). As the motor (51) rotates, the motor (51) drives the small rotating shaft (67) and the pressing block (69) thereon to rotate and compress the force storage spring (59) through the transmission ring (55) and the telescopic head (56) thereon. The small rotating shaft (67) drives the rotating plate (63) thereon to rotate. At this time, the space inside the expansion chamber (1101) increases, and the space inside the pressure chamber (1102) decreases. The rotating plate (63) squeezes the sludge in the pressure chamber (1102) to crush it. Step S5: After the water in the sludge in the reaction chamber (11) completely forms carbon dioxide hydrate, the pressure in the reaction chamber (11) is stable, that is, the carbon dioxide pressure is stable, indicating that the sludge reaction in the reaction chamber (11) is completed, and the exhaust port (3) is opened to discharge the carbon dioxide in the reaction chamber (11), and then the sludge is discharged from the discharge port (8).

10. A sludge dehydration process based on carbon dioxide hydrate according to claim 9, It is characterized in that The step S4 specifically comprises the following steps: Step S41: As the small rotating shaft (67) rotates, when the force storage spring (59) is compressed to the limit, the telescopic head (56) retracts and separates from the pressing block (69). At this time, the force storage spring (59) drives the rotating plate (63) to rotate through the pressing block (69), thereby driving the sludge in the expansion chamber (1101) to be lifted and turned over; Step S42: As the internal space of the expansion chamber (1101) increases, the sludge during the turning process can be mixed with a sufficient amount of carbon dioxide.

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