Mobile drainage plate vacuum combined jet mud dewatering device and dewatering method

Abstract

The application discloses a mobile drainage plate vacuum combined jetting mud slurry dewatering device and a dewatering method. Each mud slurry dewatering cavity comprises two mobile drainage plates and flexible mud blocking cloth which forms foldable side walls by surrounding edges of the two mobile drainage plates. Each of the two mobile drainage plates belonging to the same mud slurry dewatering cavity is provided with a plurality of columnar jetting nozzles on the opposite surfaces. The jetting ends of the plurality of jetting nozzles of each mobile drainage plate protrude towards the direction of the mud slurry to be dewatered, and the jetting ends are covered with the water permeable cloth, so that a gap is formed between the water permeable cloth and the mobile drainage plate as a drainage cavity. Each drainage cavity is connected with a water pumping negative pressure source through a vacuum drainage port at a position corresponding to the edge of the corresponding mobile drainage plate. During dewatering, the two mobile drainage plates are gradually folded along the horizontal direction, and conical gas is jetted through the jetting nozzles. The application can reduce the influence of the mud skin on the dewatering efficiency and improve the deep dewatering effect of the mud slurry.

Description

Technical Field

[0001] This invention relates to the field of mud dewatering technology, and particularly to a mobile drainage plate vacuum combined jet dewatering device and dewatering method for mud. Background Technology

[0002] As environmental remediation efforts intensify, several problems have become increasingly prominent:

[0003] (1) Sludge produced by sewage treatment plants;

[0004] (2) A large amount of polluted river and lake sediment;

[0005] (3) Drilling mud for cast-in-place pile construction and mud for slurry shield tunneling.

[0006] In various existing construction projects, mud contains a large amount of water. Without dehydration, it cannot be disposed of (such as through incineration, pyrolysis, solidification, etc.). How to reduce the volume through effective dehydration has become an important technical requirement in my country's water environment and soil management.

[0007] Currently, existing technologies for mud dewatering include: plate and frame filter press dewatering, vacuum dewatering, centrifugal dewatering, and pressurization methods using drainage components.

[0008] Among them, plate and frame filter press dewatering, vacuum dewatering, centrifugal dewatering and other technologies have high costs, complex equipment and processes, and low costs and simple processes, but their own defects make it difficult to promote and apply them.

[0009] For example, the "A Mud / Mulch Dewatering Equipment and Dewatering Method" disclosed in CN104860506A uses hydraulic pressure to pressurize the top cover, with a maximum pressure of 900 kPa. According to its recommended mud storage container size (length * width * height = 2m * 1m * 3m), to achieve a pressure of 900 kPa, the required total vertical pressure is 1800 kN (i.e., 180 tons).

[0010] Therefore, the pressurized hydraulic cylinder is very large, and the requirements for the hydraulic lines are very high. This leads to the following intractable problems in practical applications:

[0011] (1) How to provide the 180-ton reaction device;

[0012] (2) How to solve the sealing problem of the movable pressure plate under high pressure? The movable plate and the container wall need to be processed with the precision of a hydraulic cylinder to achieve this. The operability is poor, otherwise the mud and water will gush out from the gap.

[0013] (3) The existing drainage board cannot be reused, is costly, and is not energy-saving or environmentally friendly.

[0014] (4) The existing technology cannot achieve rapid soil unloading.

[0015] If a plate and frame filter press is used for drainage, a fixing device is required, and a positive pressure process is adopted. Its disadvantages are small chamber capacity, low efficiency, high energy consumption, high cost, slow soil unloading speed, and the need to unload soil from each chamber one by one.

[0016] Furthermore, in practical applications, clogging of permeable fabric has always been a difficult problem to solve. Because the fine particles are tightly packed at the drainage channel opening of the permeable fabric, it is difficult for water to drain out. In the dewatering process, as the thickness of the tightly packed fine particles increases, it becomes increasingly difficult for water to drain out, eventually leading to failure.

[0017] Therefore, how to reduce the cost of mud dewatering, improve efficiency, simplify on-site operation, solve problems such as high energy consumption, rapid soil unloading, and permeable cloth clogging and reusability have become technical problems that urgently need to be solved by those skilled in the art. Summary of the Invention

[0018] In view of the above-mentioned deficiencies of the prior art, the present invention provides a mobile drainage plate vacuum combined jet dewatering device and dewatering method for mud, the purpose of which is to reduce the power consumption of mechanical pressurization in the prior art, improve the deep dewatering effect of mud, and overcome the deficiencies of the prior art.

[0019] To achieve the above objectives, the present invention discloses a mobile drainage plate vacuum combined jet blasting mud dewatering device, which includes multiple mud dewatering chambers.

[0020] Each of the aforementioned mud dewatering chambers includes two opposing movable drainage plates that can reciprocate along the normal direction, and a flexible mud-blocking cloth disposed between the two movable drainage plates, forming a foldable sidewall around the edges of the two movable drainage plates.

[0021] All the movable drainage plates of the plurality of mud dewatering chambers are arranged in parallel to each other;

[0022] Each pair of movable drainage plates belonging to the same mud dewatering chamber has multiple columnar air nozzles on their facing surfaces.

[0023] Each of the multiple air nozzles of the movable drainage board protrudes 1 to 2 millimeters toward the direction of the cement slurry to be removed, and the air nozzles are covered with permeable cloth, so that a gap is formed between the permeable cloth and the movable drainage board located at the root of the corresponding air nozzle as a drainage cavity.

[0024] Each of the drainage cavities is connected to a negative pressure pumping source via a vacuum drain port at the corresponding edge of the movable drainage plate.

[0025] Each of the movable drainage plates has a compressed air chamber on the side facing away from the corresponding jet nozzle;

[0026] Each of the compressed air chambers introduces pressurized air through an air inlet located at the edge of the corresponding movable drainage plate, and sprays the pressurized air into the cement slurry to be dewatered through the corresponding jet nozzle.

[0027] Preferably, all of the movable drainage boards are installed vertically, or at an angle of less than 15 degrees to the vertical direction;

[0028] Each of the aforementioned mud dewatering chambers has a mud discharge port on the side of the flexible mud-blocking cloth facing the ground.

[0029] More preferably, the flexible mud-blocking cloth of each of the mud dewatering chambers has a three-way pipe structure, including a straight pipe section connected to one and two corresponding movable drainage boards, and a bypass section located on the side facing the ground to form the mud discharge port;

[0030] The straight pipe section and each of the corresponding movable drainage boards are rigidly sealed together by a sealing strip;

[0031] The bypass section uses a pressure-type sealing spring or a shaft-roll seal to form an openable or closable sealing door, and is bonded to the straight pipe section with a high-strength adhesive material or connected by plastic welding.

[0032] More preferably, each of the movable drainage boards is provided with a mud inlet on the side facing away from the ground.

[0033] Preferably, the plurality of jet nozzles of each of the movable drainage boards are arranged in a rectangular array.

[0034] Preferably, in every two adjacent mud dewatering chambers, two adjacent movable drainage boards share the same air pressure chamber.

[0035] Preferably, all of the movable drainage boards form a sliding pair with the chute via a bracket with changing wheels, enabling them to reciprocate along the chute.

[0036] Preferably, the gas ejected from each of the jet nozzles is conical.

[0037] Preferably, the permeable cloth is made of a non-clay polymer material; the flexible mudguard cloth is a vertical flexible mudguard cloth.

[0038] Preferably, the thickness of each of the mud dewatering chambers is 4cm to 7cm.

[0039] Preferably, the distance between the two movable drainage boards in each mud dewatering chamber is such that the thickness of the "mud cake" formed after dewatering is ensured, that is, the distance between the two movable drainage boards after they are closed is no more than 2.5cm.

[0040] This invention also provides a dewatering method using the aforementioned mobile drainage plate vacuum combined jet blasting mud dewatering device, the specific steps of which are as follows:

[0041] Step 1: After checking and closing all sludge discharge ports, pour the sludge to be dewatered into the sludge inlet and then seal the sludge inlet.

[0042] Step 2: The two movable drainage plates in each mud dewatering chamber are gradually closed, and the vacuum drainage port is opened to a vacuum degree of 100 kPa to drain water to the outside until the water content of the mud to be dewatered reaches the design requirements. The following operations are performed during the process:

[0043] Step 2.1: Continue vacuuming to drain water to the outside. After 2 to 3 minutes of drainage, when the initial mud cake forms, affecting the permeability and reducing the outflow, open all air nozzles to spray air every 1 to 2 minutes to fully disturb the mud cake, prevent the formation of a dense mud cake, and keep the drainage channels unobstructed. The air spray pressure is 100 kPa to 200 kPa, and each spray should not exceed 10 seconds to reduce the impact of positive pressure gas on the vacuuming effect. Continue until the soil is fully disturbed and broken up, forming drainage channels.

[0044] Step 2.2: Repeat step 2.1 until each batch of mud is dewatered to the designed moisture content;

[0045] Step 3: The two movable drainage boards in each mud dewatering chamber are gradually separated, and all air nozzles are opened at the same time to spray air and wash away the mud stuck to the permeable cloth.

[0046] Step 4: After the two movable drainage plates in each of the mud dewatering chambers are completely separated, open all the mud discharge ports and remove the mud formed after dewatering.

[0047] Step 5: Repeat steps 1 to 4 until all the cement slurry to be dewatered is dewatered;

[0048] Step 6: Introduce pressurized clean water into the air chamber and clean the permeable fabric by spraying clean water from all the air nozzles.

[0049] The beneficial effects of this invention are:

[0050] The application of this invention can reduce the impact of mud cake on dewatering efficiency, improve the deep dewatering effect of mud, reduce the power consumption of mechanical pressurization in the prior art, greatly reduce the number of unloading operations, improve the overall dewatering efficiency, and overcome the defects of the prior art.

[0051] The following will further explain the concept, specific structure, and technical effects of the present invention in conjunction with the accompanying drawings, so as to fully understand the purpose, features, and effects of the present invention. Attached Figure Description

[0052] Figure 1 This diagram shows a longitudinal cross-sectional view of the two movable drainage plates in the separated state of each mud dewatering chamber in one embodiment of the present invention.

[0053] Figure 2 This diagram shows a longitudinal cross-sectional view of the two movable drainage plates of each mud dewatering chamber in an embodiment of the present invention in the closed state.

[0054] Figure 3 This diagram illustrates the structure of a movable drainage board with a permeable cloth side, according to one embodiment of the present invention.

[0055] Figure 4 This is a schematic diagram of the structure of the sludge discharge port in the closed state according to an embodiment of the present invention.

[0056] Figure 5 This is a schematic diagram of the structure of the sludge discharge port in an embodiment of the present invention in the open state. Detailed Implementation

[0057] Example

[0058] like Figures 1 to 5 As shown, the mobile drainage plate vacuum combined jet thunder mud dewatering device includes multiple mud dewatering chambers 1;

[0059] Each mud dewatering chamber 1 includes two movable drainage plates 2 that are arranged opposite to each other and can reciprocate along the normal direction, and a flexible mud-blocking cloth 11 that is arranged between the two movable drainage plates 2 and surrounds the edges of the two movable drainage plates 2 to form a foldable side wall.

[0060] All movable drainage plates 2 of the multiple mud dewatering chambers 1 are arranged in parallel to each other;

[0061] Each pair of movable drainage boards 2 belonging to the same mud dewatering chamber 1 has multiple columnar air nozzles 4 on their facing surfaces.

[0062] Each movable drainage board 2 has multiple air nozzles 4 whose air jet ends protrude 1 mm to 2 mm toward the cement slurry to be removed 18, and the air jet ends of multiple air nozzles 4 are covered with permeable cloth 3, so that a gap is formed between the corresponding permeable cloth 3 and the movable drainage board 2 located at the root of the corresponding air nozzle 4 as a drainage cavity 8.

[0063] Each drainage cavity 8 is connected to a negative pressure source via a vacuum drain port 6 at the corresponding edge of the movable drainage plate 2.

[0064] Each movable drainage plate 2 has a compressed air chamber 9 on the side facing away from the corresponding jet nozzle 4;

[0065] Each compressed air chamber 9 introduces pressurized air through an air inlet 7 located at the edge of the corresponding movable drainage plate 2, and sprays the pressurized air through the corresponding jet nozzle 4 into the cement slurry 18 to be dewatered.

[0066] The principle of this invention is as follows:

[0067] By connecting the vacuum drain port 6 to the negative pressure source to form a negative pressure, the water in the slurry 18 to be dewatered enters the drainage cavity 8 through the permeable cloth 3, and then the water is discharged out of the container through the vacuum drain port 6.

[0068] In this invention, gas with a certain pressure is ejected from the jet nozzle 4. On the one hand, it increases the pressure in the soil, causing excess pore water pressure to form in the soil and improving drainage efficiency. On the other hand, the ejected gas disturbs the dense soil accumulated on the permeable cloth 3, increasing drainage channels and achieving the purpose of preventing mud crust blockage and increasing permeability.

[0069] After the cement slurry 18 is filled, a vacuum is used to create a negative pressure in the container during operation. Under the action of the negative pressure, the water in the cement slurry 18 flows from the soil through the permeable cloth 3 into the drainage cavity 8.

[0070] The present invention uses a flexible and foldable mud-blocking cloth 11 as the wall of the mud storage container, which can move back and forth in the horizontal direction to change the internal volume of the mud storage container 1. During the process of water being discharged from the soil, the volume loss of the mud storage container 1 is compensated by reducing the volume.

[0071] The present invention utilizes the gap formed between the permeable cloth 3 and the movable drainage board 2 to drain water, which can effectively reduce the drainage path.

[0072] It also ensures that the thickness of the dehydrated mud cake is less than the thickness of the mud skin that forms a "clogging" effect, as detailed below:

[0073] In the initial stage of vacuum drainage, the drainage effect is the best. As the water content of the cement slurry 18 to be dewatered gradually decreases, a dense mud layer is formed on the outside of the permeable cloth 3. After reaching a certain level, the water content in the cement slurry 18 to be dewatered will have difficulty passing through the dense mud layer and being discharged away from the permeable cloth 3, resulting in a "blockage" phenomenon and affecting the dewatering effect. This invention uses air jet nozzles 4 to pressurize and spray air onto the dense mud layer to disturb and destroy the dense soil structure, thereby increasing the drainage channels.

[0074] The positive pressure of the jet generated by the jet nozzle 4 is superimposed on the vacuum drain port 6, increasing the pressure difference and improving the drainage effect.

[0075] The permeable cloth 3 can be reused after surface cleaning without disassembly, making it easier to operate and improving work efficiency.

[0076] In some embodiments, all movable drainage boards 2 are installed vertically or at an angle of less than 15 degrees to the vertical direction;

[0077] Each mud dewatering chamber 1 has a mud discharge port 10 on the side of the flexible mud-blocking cloth 11 facing the ground.

[0078] In practical applications, the mud dewatering chamber 1 gradually closes during the injection of the mud slurry 18 to be dewatered and the dewatering process. After dewatering is completed, the mud discharge port 10 is opened, and the movable drainage plate 2 is returned to the initial position in the opposite direction. The dewatered mud can be discharged from the mud discharge port 10 under the action of gravity. If the soil is stuck to the permeable cloth, the air jet can be turned on to separate the mud from the permeable cloth 3 and cause the soil to fall off.

[0079] In some embodiments, the flexible mud-blocking cloth 11 of each mud dewatering chamber 1 is a three-way pipe structure, including a straight pipe section connected to one and two corresponding movable drainage boards 2, and a bypass section 13 located on the side facing the ground to form a mud discharge port 10.

[0080] The straight pipe section is rigidly sealed to each corresponding movable drainage board 2 using a sealing strip 14;

[0081] The bypass section 13 uses a pressure-type sealing spring 13 or a shaft-roll seal to form an openable or closable sealing door, and is bonded to the straight pipe section by a high-strength adhesive material or connected by plastic welding.

[0082] In some embodiments, each movable drainage board 2 has a mud inlet 5 on the side facing away from the ground.

[0083] In some embodiments, the plurality of jet nozzles 4 of each movable drainage plate 2 are arranged in a rectangular array.

[0084] In some embodiments, two adjacent movable drainage boards 2 in every two adjacent mud dewatering chambers 1 share the same air chamber 9.

[0085] In some embodiments, all movable drainage boards 2 form a sliding pair with the slide 16 via a bracket 15 with a changing wheel 17, and can reciprocate along the slide 16.

[0086] In some embodiments, the gas ejected from each nozzle 4 is conical.

[0087] In practical applications, the conical gas ejected by the jet nozzle 4 can better increase the radiation surface of the mud skin, disturb the entire mud skin, destroy its structure, and achieve the effect of increasing permeability.

[0088] In some embodiments, the permeable cloth 3 is made of a non-clay polymer material; the flexible mudguard cloth 11 is a vertical flexible mudguard cloth.

[0089] In some embodiments, the thickness of each mud dewatering chamber 1 is 4 cm to 7 cm.

[0090] In some embodiments, the distance between the two movable drainage plates 2 in each mud dewatering chamber 1 is such that the thickness of the "mud cake" formed after dewatering is ensured, that is, the distance between the two movable drainage plates 2 after they are closed is no more than 2.5cm.

[0091] This invention also provides a dewatering method using the aforementioned mobile drainage plate vacuum combined jet blasting mud dewatering device, the specific steps of which are as follows:

[0092] Step 1: After checking and closing all sludge discharge ports 10, pour the sludge to be dewatered 18 into the sludge inlet 5 and then seal the sludge inlet 5.

[0093] Step 2: The two movable drainage plates 2 of each mud dewatering chamber 1 are gradually closed, and the vacuum drainage port 6 is opened to a vacuum degree of 100kPa to drain water to the outside until the water content of the mud slurry 18 to be dewatered reaches the design requirements. The following operations are performed during the process:

[0094] Step 2.1: Continue vacuuming to drain water to the outside. After 2 to 3 minutes of drainage, when the initial mud cake forms, affecting the permeability and reducing the water output, open all air nozzles 4 to spray air. Spray air once every 1 to 2 minutes to fully disturb the mud cake, prevent the formation of a dense mud cake, and keep the drainage channels unobstructed. The air spray pressure is 100 kPa to 200 kPa, and each time does not exceed 10 seconds to reduce the impact of positive pressure gas on the vacuuming negative pressure effect. Continue until the soil is fully disturbed and broken to form drainage channels.

[0095] In practical applications, when the jet nozzle 4 is jetting, it is necessary to ensure that the pressure in the mud dewatering chamber 1 does not become positive due to the addition of too much gas, so as to ensure that the mud slurry 18 to be dewatered can continuously drain to the outside.

[0096] Step 2.2: Repeat step 2.1 until each mud is dewatered to the designed moisture content;

[0097] Step 3: The two movable drainage boards 2 of each mud dewatering chamber 1 are gradually separated, and all air nozzles 4 are opened at the same time to spray air and wash away the mud stuck to the permeable cloth 3.

[0098] Step 4: After the two movable drainage plates 2 in each mud dewatering chamber 1 are completely separated, open all mud discharge ports 10 and remove the mud formed after dewatering.

[0099] Step 5: Repeat steps 1 to 4 until all the slurry to be dewatered 18 is dewatered;

[0100] Step 6: Pressurized clean water is introduced into the compressed air chamber 9, and the permeable cloth 3 is cleaned by spraying clean water from all the air nozzles 4.

[0101] The present invention ensures that the volume of the mud formed after dewatering is not greater than the volume of the two movable drainage boards 2 of the corresponding mud dewatering chamber 1 when the slurry to be dewatered 18 is poured in. The two movable drainage boards 2 are closed with a distance of 4cm to 7cm, which can complete the rapid dewatering before the dense soil body is formed on the permeable cloth 3 and "clogging" occurs.

[0102] During operation, this invention uses a jet nozzle 4 to deliver air at a pressure of 100 kPa to 200 kPa to break through the mud skin and form a drainage channel.

[0103] The preferred embodiments of the present invention have been described in detail above. It should be understood that those skilled in the art can make numerous modifications and variations based on the concept of the present invention without creative effort. Therefore, all technical solutions that can be obtained by those skilled in the art based on the concept of the present invention through logical analysis, reasoning, or limited experimentation on the basis of existing technology should be within the scope of protection defined by the claims.

Claims

1. A mobile drainage plate vacuum combined jet dewatering device for mud dewatering, comprising multiple mud dewatering chambers (1); characterized in that, Each of the mud dewatering chambers (1) includes two movable drainage boards (2) that are arranged opposite to each other and can reciprocate along the normal direction, and a flexible mud-blocking cloth (11) that is arranged between the two movable drainage boards (2) and surrounds the edges of the two movable drainage boards (2) to form a foldable sidewall. All the movable drainage plates (2) of the plurality of mud dewatering chambers (1) are arranged in parallel to each other; On the facing surfaces of each pair of movable drainage boards (2) belonging to the same mud dewatering chamber (1), there are multiple columnar air nozzles (4); Each of the multiple air nozzles (4) of the movable drainage board (2) protrudes 1 to 2 millimeters toward the cement slurry (18) to be removed, and the air nozzles (4) are covered with permeable cloth (3), so that a gap is formed between the permeable cloth (3) and the movable drainage board (2) located at the root of the corresponding air nozzle (4) as a drainage cavity (8); Each of the drainage cavities (8) is connected to a negative pressure pumping source via a vacuum drain port (6) at the corresponding edge of the movable drainage plate (2); Each of the movable drainage plates (2) is provided with a compressed air chamber (9) on the side facing away from the corresponding jet nozzle (4); Each of the compressed air chambers (9) introduces pressurized air through an air inlet (7) located at the edge of the corresponding movable drainage plate (2), and sprays the pressurized air through the corresponding jet nozzle (4) into the cement slurry (18) to be dewatered.

2. The mobile drainage plate vacuum combined jet dewatering device for mud dewatering according to claim 1, characterized in that, All of the aforementioned movable drainage boards (2) are installed vertically or at an angle of less than 15 degrees to the vertical direction; Each of the mud dewatering chambers (1) has a mud discharge port (10) on the side of the flexible mud-blocking cloth (11) facing the ground.

3. The mobile drainage plate vacuum combined jet dewatering device for mud dewatering according to claim 2, characterized in that, Each of the mud dewatering chambers (1) has a flexible mud-blocking cloth (11) in the form of a three-way pipe structure, including a straight pipe section connected to one and two corresponding movable drainage boards (2), and a bypass section (13) located on the side facing the ground to form the mud discharge port (10). The straight pipe section is rigidly sealed to each of the corresponding movable drainage boards (2) by a sealing strip (14); The bypass section (13) is formed by a pressure-type sealing spring (13) or a shaft-roll seal to form an openable or closable sealing door, and is bonded to the straight pipe section by a high-strength adhesive material or by plastic welding. Each of the movable drainage boards (2) is provided with a mud inlet (5) on the side facing away from the ground.

4. The mobile drainage plate vacuum combined jet dewatering device for mud dewatering according to claim 1, characterized in that, The plurality of jet nozzles (4) of each of the movable drainage boards (2) are arranged in a rectangular array; In every two adjacent mud dewatering chambers (1), the two adjacent movable drainage boards (2) share the same air pressure chamber (9).

5. The mobile drainage plate vacuum combined jet dewatering device for mud dewatering according to claim 1, characterized in that, All of the movable drainage boards (2) are connected to the slide (16) by a bracket (15) with a changing wheel (17) to form a moving pair, and can move back and forth along the slide (16).

6. The mobile drainage plate vacuum combined jet dewatering device for mud dewatering according to claim 1, characterized in that, The gas ejected from each of the jet nozzles (4) is conical.

7. The mobile drainage plate vacuum combined jet dewatering device for mud dewatering according to claim 1, characterized in that, The permeable cloth (3) is made of non-clay polymer material; the flexible mudguard cloth (11) is a vertical flexible mudguard cloth.

8. The mobile drainage plate vacuum combined jet dewatering device for mud dewatering according to claim 1, characterized in that, The thickness of each of the mud dewatering chambers (1) is 4cm to 7cm.

9. The mobile drainage plate vacuum combined jet dewatering device for mud dewatering according to claim 1, characterized in that, The distance between the two movable drainage boards (2) in each mud dewatering chamber (1) is such that the thickness of the "mud cake" formed after dewatering is ensured, that is, the distance between the two movable drainage boards (2) after they are closed is no more than 2.5cm.

10. A dehydration method, characterized in that, The specific steps of using the mobile drainage board vacuum combined jet dewatering device as described in any one of claims 1 to 9 are as follows: Step 1: After checking and closing all sludge discharge ports (10), pour the sludge to be dewatered (18) into the sludge inlet (5) and then close the sludge inlet (5); Step 2: The two movable drainage plates (2) of each mud dewatering chamber (1) are gradually closed, and the vacuum drainage port (6) is opened to a vacuum degree of 100kPa to drain water to the outside until the water content of the mud slurry (18) to be dewatered reaches the design requirements. The following operations are performed during the process: Step 2.1: Continue to drain water to the outside through vacuum. After draining water to the outside for 2 to 3 minutes, when the initial mud skin is formed, affecting the water permeability and the water output decreases, open all the air nozzles (4) to spray air. Spray air once every 1 to 2 minutes to fully disturb the mud skin, prevent the formation of dense mud skin, keep the drainage channel unobstructed, and spray air at a pressure of 100 kPa to 200 kPa. Each time, the air spray should not exceed 10 seconds to reduce the impact of positive pressure gas on the vacuum negative pressure effect. Continue until the soil is fully disturbed and destroyed to form a drainage channel. Step 2.2: Repeat step 2.1 until each of the muds is dewatered (1) to the designed moisture content; Step 3: The two movable drainage boards (2) of each mud dewatering chamber (1) are gradually separated, and all air nozzles (4) are opened at the same time to spray air and flush away the mud stuck to the permeable cloth (3). Step 4: After the two movable drainage plates (2) of each mud dewatering chamber (1) are completely separated, open all the mud discharge ports (10) and take out the mud formed after dewatering. Step 5: Repeat steps 1 to 4 until all the cement slurry (18) to be dewatered is dewatered; Step 6: Pressurized clean water is introduced into the air chamber (9), and the permeable cloth (3) is cleaned by spraying clean water from all the air nozzles (4).

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