A spiral electroosmotic dehydrator

Abstract

The present invention discloses a spiral electroosmotic dewatering machine. It includes a sealed housing, a driving motor, a conveying spiral shaft, an intermittent insulating spiral blade group, a tubular anode, a stirrer, and a grid-shaped cathode; the grid-shaped cathode is arranged in a cylindrical shape at the rear part inside the sealed housing; the tubular anode is arranged inside the cylinder of the grid-shaped cathode and is connected to the conveying spiral shaft; the intermittent insulating spiral blade group is arranged on the tubular anode; the stirrer is arranged inside the grid-shaped cathode, and its protruding teeth are inserted between the intermittent insulating spiral blade groups on the tubular anode; the grid-shaped cathode and the tubular anode are respectively connected to the negative electrode and the positive electrode of a high-frequency DC power supply; a back pressure plate is arranged at the sludge outlet; an air inlet pipe is arranged at the bottom of the sealed housing, and an air inlet solenoid valve is arranged on the air inlet pipe; an air extraction pipe is arranged at the bottom of the sealed housing, and the air extraction pipe is connected to a vacuum pump through a condenser. The present invention can solve the problem that it is difficult to discharge the anodic oxidation gas, can solve the problems of anode adhesion and cathode static scaling, and can solve the problem of uneven moisture content distribution in the sludge cross-section.

Description

Technical Field

[0001] The present invention belongs to the technical field of sludge dewatering and relates to a spiral electroosmotic dewatering machine. Background Art

[0002] Generally, the average moisture content of primary dewatered sludge is about 82%. The current requirements for sludge treatment are: reduction, harmlessness, stabilization, and resource utilization. Among them, reduction is crucial, requiring the moisture content of sludge to be reduced from 82% to about 50%, reducing the sludge volume by more than half, forming a relatively stable state, and not easily causing secondary pollution. At present, drying or deep extrusion methods are commonly used in the dehydration link of sludge treatment. Drying requires a large amount of energy consumption, generates odors that need further treatment, and cannot change the nature of sludge; in the process of deep extrusion, chemicals need to be added to condition the sludge, and the side effect of the chemicals is to increase the total dry weight of the sludge and deteriorate the sludge quality, resulting in difficulties in subsequent disposal.

[0003] Electroosmotic dewatering technology uses the principle of electroosmosis for electroosmotic dewatering. By applying a DC electric field to the sludge to be treated, the negatively charged sludge is attracted to the anode. On the other hand, the water between the sludge gaps is moved to the cathode, separating the water from the sludge, and then by pressurizing the sludge, the sludge is dewatered. Compared with ordinary mechanical dewatering treatment, electroosmotic dewatering technology has the advantages of high dewatering efficiency, low energy consumption, and lower water content of the treated sludge than that of general mechanical treatment.

[0004] Existing common electroosmotic dewatering equipment includes track type (continuous working mode) and plate type (batch type working mode). For these two forms of equipment, since the sludge is relatively stationary with respect to the anode and cathode, the disadvantages are obvious; the sludge at the anode end loses water and the dry resistance increases: at the same time, due to the electrochemical effect, redox reactions occur at the anode end to separate oxygen, creating voids between the sludge and the anode. To ensure the dewatering efficiency, the voltage needs to be increased to further dehydrate; at the same time, water quickly accumulates at the cathode end, resulting in uneven moisture content distribution across the sludge cross-section; the heavy metal oxides (calcium oxide, magnesium oxide, etc.) electrolyzed from the sludge react with the oxygen in the air on the cathode surface, forming scale on the cathode, which continuously thickens and is difficult to remove, blocking the current and doubling the energy consumption. To solve the above problems, a large auxiliary mechanism must be added. This is also the main problem why electroosmotic dewatering technology, although having the characteristics of low energy consumption and high efficiency, cannot be widely applied. Summary of the Invention

[0005] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a spiral electroosmotic dewatering machine that can solve the problem of difficult exclusion of anodic oxidation gas, can solve the problems of anode adhesion and cathode static scaling, and can solve the problem of uneven moisture content distribution across the sludge cross-section.

[0006] The object of the present invention is achieved by the following technical solutions:

[0007] A spiral electroosmotic dehydrator of the present invention mainly includes a sludge conveying part and a dehydration part, and also includes a driving motor and a sealed housing; the sludge conveying part mainly includes a driving motor and a conveying spiral shaft connected to each other; the dehydration part includes an intermittent insulating spiral blade group, a tubular anode, a stirrer, a grid-type cathode, a back pressure plate, a high-frequency DC power supply, an intake solenoid valve, a cooler and a vacuum pump; the sealed housing is in an irregular cylindrical or square tube shape; the conveying spiral shaft is arranged inside the sealed housing and on the central axes of the front and middle parts; the grid-type cathode is in a cylindrical shape, arranged inside the sealed housing and at the rear part, and there is a certain gap between the sealed housing and the grid-type cathode; the tubular anode is arranged on the central axis inside the cylinder of the grid-type cathode; the conveying spiral shaft is connected to the tubular anode; an intermittent insulating spiral blade group is provided on the tubular anode; the stirrer is arranged inside the grid-type cathode, and the protruding teeth of the stirrer are inserted between the intermittent insulating spiral blade groups on the tubular anode; the grid-type cathode is connected to the negative pole of the high-frequency DC power supply, and the tubular anode is connected to the positive pole of the high-frequency DC power supply; a back pressure plate for generating pressure in the dehydration cavity is provided at the sludge outlet; an air inlet pipe communicating with the atmosphere is provided at the bottom of the sealed housing, and an intake solenoid valve is provided on this air inlet pipe; an air extraction pipe is provided at the bottom of the rear part of the sealed housing, and this air extraction pipe is connected to the vacuum pump through a condenser.

[0008] Further, the conveying spiral shaft and the tubular anode are connected by an insulating coupling.

[0009] Further, on the tubular anode, a double spiral blade group (i.e., the intermittent insulating spiral blade group) composed of a single spiral blade fixed on the tubular anode with a 180° stagger at a certain interval is provided every certain interval.

[0010] Further, the angle between adjacent double spiral blade groups is 90°.

[0011] Further, the spiral lead angle of each spiral blade of the intermittent insulating spiral blade group is between 10 and 20 degrees.

[0012] Further, the material of each spiral blade of the intermittent insulating spiral blade group is an insulating material, and its resistivity is greater than 1010 Ω·m; the cross-sectional shape of each spiral blade is trapezoidal.

[0013] Further, each spiral blade of the intermittent insulating spiral blade group is fixed on the tubular anode by bolts.

[0014] Further, the grid-type cathode is composed of two semi-cylinders joined together. Stirrers are respectively installed at the upper and lower joining parts of the two semi-cylinders. The grid-type cathode and the stirrer are fixed into one body by bolts or fixing parts and installed on the sealed housing.

[0015] Further, radially outward flanges are provided at the left and right ends of the two semi-cylinders of the grid-type cathode; bolt holes for connecting with the sealed housing are provided on the radially outward flanges; axially outward flanges are provided at the upper and lower ends of the two semi-cylinders of the grid-type cathode; bolt holes for splicing and connecting with the agitator are provided on the axially outward flanges; the sealed housing and the grid-type cathode are fixed by bolts installed on the radially outward flanges; the grid-type cathode and the agitator are fixed by bolts installed on the axially outward flanges (the grid-type cathode and the agitator are fixed by clamping with bolts and nuts: the bolt first passes through the bolt hole of the grid-type cathode of one semi-cylinder, then passes through the fixed bolt hole of the agitator, and then passes through the bolt hole of the grid-type cathode of the other semi-cylinder, and is tightened with a nut).

[0016] Further, the two semi-cylinders of the grid-type cathode are formed by arranging and combining a number of rows of trapezoidal cross-section sieve bars welded thereon; the trapezoidal cross-section sieve bars are distributed along the circumference (the sieve gap is 0.1 - 0.25 mm), forming a filter body.

[0017] Key technical points and protected points of the present invention

[0018] 1. In the dehydration part, the combination of the intermittent spiral structure, electroosmotic dehydration and low-temperature pulsating vacuum dehydration technologies enables the sludge to be dehydrated.

[0019] 2. The material of the intermittent insulating spiral blade group is an insulating material (its resistivity is generally greater than 1010 Ω·m), and the normal cross-sectional shape of the spiral blade is trapezoidal.

[0020] 3. The intermittent insulating spiral blade group is fixedly installed on the tubular anode in pairs, and the adjacent spiral blade groups form a 90° angle, and the spiral lead angle of the spiral blade is between 10° and 20° (after combination, the spiral lead angle of the intermittent spiral can be from large to small or from small to large);

[0021] 4. The grid-type cathode is composed of two semi-circles, and agitators are respectively installed on the upper and lower parts, and the grid-type cathode and the agitator are fixed into one body by bolts or fixing parts.

[0022] 5. On the grid-type cathode, it is formed by welding trapezoidal cross-section sieve bars arranged in a circle, and the sieve gap is 0.1 - 0.25 mm, forming a filter body.

[0023] 6. The distance between the two axial sides of the agitator and the intermittent insulating spiral blade group is 3 - 5 mm.

[0024] 7. A back pressure plate for generating pressure in the dehydration inner cavity is provided at the sludge outlet, and the form of the back pressure plate can be fixed, elastic, or a structure that generates pressure in the dehydration inner cavity through the action of a cylinder and a force arm.

[0025] 8. Connect the filter body formed by the grid-shaped cathode to the negative pole of the high-frequency DC power supply, and connect the tubular anode to the positive pole of the high-frequency DC power supply, so as to form a ring-shaped electric field on the sludge therebetween to generate the function of electroosmotic dehydration.

[0026] 9. Between the sealed housing and the filter body formed by the grid-shaped cathode, through the coordinated operation of the intake solenoid valve and the vacuum pump, a cycle state of vacuum pumping - pressure relief is formed, resulting in the effect of pulsating vacuum dehydration.

[0027] 10. The conveying spiral shaft and the tubular anode are connected by an insulating coupling (or other insulating structural forms for connection), which generates a driving effect and isolates the current between the conveying part and the dehydration part. The resistivity of the insulating coupling is generally greater than 1010 Ω·m.

[0028] Advantages of the present invention:

[0029] The spiral electroosmotic dehydrator of the present invention can solve the problem of difficult exclusion of anodic oxidation gas, can solve the problems of anode adhesion and cathode static scaling, and can solve the problem of uneven moisture content distribution in the sludge cross-section.

[0030] The spiral electroosmotic dehydrator of the present invention has the following advantages compared with the prior art:

[0031] 1. It can solve the problem of difficult exclusion of anodic oxidation gas.

[0032] 2. It can solve the problems of anode adhesion and cathode static scaling.

[0033] 3. It can solve the problem of uneven moisture content in the sludge cross-section.

[0034] 4. It can reduce energy consumption.

[0035] 5. It can reduce waste gas emissions.

[0036] 5. The equipment has a simple structure, low equipment cost and low maintenance cost.

[0037] 6. It operates continuously with high productivity.

[0038] 7. The equipment is completely sealed and automatically controlled, which is environmentally friendly. Description of the Drawings

[0039] Figure 1 It is a schematic structural diagram of a spiral electroosmotic dehydrator of the present invention;

[0040] Figure 2 It is a schematic structural diagram of the intermittent type insulating spiral blade group 6 in the present invention;

[0041] Figure 3It is a schematic structural diagram (side view) of the connection between the grid-type cathode 9 and the stirrer 8 in the present invention;

[0042] Figure 4 It is a schematic cross-sectional structural diagram of the connection between the grid-type cathode 9 and the stirrer 8 in the present invention;

[0043] Figure 5 It is a schematic structural diagram (top view) of the grid-type cathode 9 in the present invention;

[0044] Figure 6 It is Figure 5 The enlarged view at position I in

[0045] Figure 7 It is a three-dimensional structural diagram of the grid-type cathode 9 in the present invention;

[0046] Figure 8 It is a shape structure diagram of the stirrer 8 in the present invention;

[0047] Figure 9 It is a schematic structural diagram of the distance between the two axial sides of the stirrer 8 and the discontinuous insulating spiral blade group 6 in the present invention being 3 - 5 mm;

[0048] Figure 10 It is a schematic structural diagram of the cleaning mechanism in the present invention.

[0049] In the figure: 1. Driving motor 2. Sealing housing 3. Conveyor screw shaft 4. Cleaning water valve 5. Insulating coupling 6. Discontinuous insulating spiral blade group 7. Tubular anode 8. Stirrer 9. Grid-type cathode 10. Back pressure plate 11. High-frequency DC power supply 12. Intake solenoid valve 13. Cooler 14. Vacuum pump 15. Spray pipe 16. Spray head A. Sludge conveying part B. Dewatering part Detailed implementation manners

[0050] The following further describes the present invention with reference to the accompanying drawings and embodiments.

[0051] Embodiment

[0052] As Figure 1As shown in the figure, a spiral electroosmotic dehydrator of the present invention is mainly divided into a sludge conveying part A and a dehydration part B. The equipment shares the same driving motor 1 and a sealed housing 2. The sludge conveying part A mainly includes a driving motor 1 and a conveying spiral shaft 3 which are connected to each other, and functions to convey and spread the sludge thinly. The dehydration part B mainly consists of an intermittent insulating spiral blade group 6, a tubular anode 7, a stirrer 8, a grid-type cathode 9, a back pressure plate 10, a high-frequency DC power supply 11, an intake solenoid valve 12, a cooler 13, and a vacuum pump 14. The sealed housing 2 is in the shape of an irregular cylinder, with a slightly larger diameter at the front, a smaller diameter in the middle, and a larger diameter at the rear. The conveying spiral shaft 3 is arranged inside the sealed housing 2 and is located on the central axis of the front and middle parts. The grid-type cathode 9 is in the shape of a cylinder, arranged inside the sealed housing 2, located at the rear, and there is a certain gap between the sealed housing 2 and the grid-type cathode 9. The tubular anode 7 is arranged on the central axis inside the cylinder of the grid-type cathode 9. The conveying spiral shaft 3 and the tubular anode 7 are connected by an insulating coupling 5. An intermittent insulating spiral blade group 6 is provided on the tubular anode 7. The stirrer 8 is arranged inside the grid-type cathode 9, and the protruding teeth 82 of the stirrer 8 are inserted between the intermittent insulating spiral blade groups 6 on the tubular anode 7. The grid-type cathode 9 is connected to the negative electrode of the high-frequency DC power supply 11, and the positive electrode of the high-frequency DC power supply 11 is connected. A back pressure plate 10 for generating pressure in the dehydration cavity is provided at the sludge outlet. An intake pipe communicating with the outside atmosphere is provided at the bottom of the rear part of the sealed housing 2, and an intake solenoid valve 12 is provided on this intake pipe. An exhaust pipe is provided at the bottom of the sealed housing 2, and this exhaust pipe is connected to the vacuum pump 14 through a condenser 13.

[0053] As Figure 1 shown, on the tubular anode 7, a double spiral blade group composed of two single spiral blades that are staggered by 180° and fixed to the tubular anode 7 by bolts is provided at regular intervals. That is to say, an intermittent insulating spiral blade group 6 is provided on the tubular anode 7. The cross-sectional shape of each spiral blade is trapezoidal. The angle between adjacent double spiral blade groups is 90° (such as the angle marked in Figure 2 ).

[0054] As Figure 2 shown, each spiral blade in the intermittent insulating spiral blade group 6 (double spiral blade group) is made of an insulating material (its resistivity is generally greater than 1010 Ω·m), and the cross-sectional shape of each spiral blade is trapezoidal; two spiral blades are fixedly installed in pairs on the tubular anode 7, and the angle between adjacent double spiral blade groups is 90° (such as the angle marked in Figure 2 ); the spiral lead angle of each spiral blade in the intermittent insulating spiral blade group 6 is between 10 and 20 degrees (the spiral lead angle of the intermittent insulating spiral blade group 6 combined by two spiral blades in a group can be from large to small or from small to large).

[0055] As Figures 3 - 6As shown in the figure, the grid-type cathode 9 is composed of two semi-cylindrical bodies joined together on the left and right. Stirrers 8 are respectively installed at the upper and lower joints of the two semi-cylindrical bodies on the left and right. The grid-type cathode 9 and the stirrers 8 are fixed into one body by bolts or fixing parts and are installed on the sealed housing 2. The two semi-cylindrical bodies of the grid-type cathode 9 are formed by arranging a number of rows of sieve bars with trapezoidal cross-sections welded thereto; on the grid-type cathode 9, the sieve bars with trapezoidal cross-sections (as Figure 6 shown, the sieve bars with trapezoidal cross-sections are distributed along the circumference) are arranged and welded, and the sieve gaps are relatively small, generally 0.1 - 0.25 mm, forming a filter body.

[0056] As Figure 7 shown, the left and right ends of the two semi-cylindrical bodies of the grid-type cathode 9 are provided with radially outward flanges; bolt holes for connecting with the sealed housing 2 are provided on the radially outward flanges; the upper and lower ends of the two semi-cylindrical bodies of the grid-type cathode 9 are provided with axially outward flanges; bolt holes for joining and connecting with the stirrers 8 are provided on the axially outward flanges; the sealed housing 2 and the grid-type cathode 9 are fixed by bolts installed on the radially outward flanges. The grid-type cathode 9 and the stirrers 8 are fixed by bolts installed on the axially outward flanges (the grid-type cathode 9 and the stirrers 8 are fixed by clamping with bolts and nuts: the bolt first passes through the bolt hole of the grid-type cathode 9 of one semi-cylindrical body, then through the fixing bolt hole of the stirrer 8, and then through the bolt hole of the grid-type cathode 9 of the other semi-cylindrical body, and is tightened with a nut).

[0057] The shape and structure of the stirrer 8 are as Figure 8 shown. The stirrer 8 includes a stirring shaft, and the stirring shaft is embedded at the upper and lower joints of the two semi-cylindrical bodies of the grid-type cathode 9; a protruding tooth is provided radially on the inner side of the stirring shaft; the protruding tooth is inserted between the intermittent insulating spiral blade groups 6 on the tubular anode 7.

[0058] As Figure 9 shown, the distances between the two axial sides of the stirrer 8 and the intermittent insulating spiral blade groups 6 are 3 - 5 mm to ensure the effect of stirring and mixing.

[0059] As Figure 1 shown, a back pressure plate 10 for generating pressure in the dehydration inner cavity is provided at the sludge outlet. The filter body formed by the grid-type cathode 9 is connected to the negative pole of the high-frequency DC power supply 11, and the tubular anode 7 is connected to the positive pole of the high-frequency DC power supply 11, so as to form an annular electric field on the sludge therebetween and generate the function of electroosmotic dehydration.

[0060] Between the filter body formed by the sealed housing 2 and the grid-type cathode 9, through the coordinated operation of the intake solenoid valve 12 and the vacuum pump 14, an intake - vacuum pumping and pressure relief cycle state is formed, resulting in the effect of pulsating vacuum dehydration.

[0061] The conveying screw shaft 3 and the tubular anode 7 are connected by an insulating coupling 5 to generate a driving effect and isolate the current between the tubular anode 7 and the conveying screw shaft 3. The resistivity of the insulating coupling 5 is generally greater than 1010 Ω·m. A cleaning mechanism is provided in the dehydration section, and the inlet water pressure is not less than 0.3 MPa. The cleaning surface covers the outer surface of the filter body formed by the grid-shaped cathode 9. The cleaning mechanism includes a water inlet pipe and a spray pipe 15 connected to each other; a cleaning water valve 4 is provided on the water inlet pipe; there are two upper and lower spray pipes 15. The upper and lower spray pipes 15 respectively pass through the upper and lower parts of the sealed housing 2 and are horizontally arranged between the sealed housing 2 and the grid-shaped cathode 9; a number of spray heads 16 are provided on the spray pipe 15.

[0062] Principle description: Sludge with a water content of about 85% is inside the sealed housing 2 and moves from the sludge conveying part to the electroosmotic dehydration part under the action of the conveying screw shaft 3; and the sludge is evenly distributed into a sludge layer with a thickness of 10 - 20 mm, and is transported to the electroosmotic dehydration part for electroosmotic dehydration and vacuum dehydration, and under the action of the intermittent insulating spiral blade group 6, it is pushed to the outlet of the back pressure plate 10 to discharge the dewatered mud cake.

[0063] At the same time, the grid-shaped cathode 9 in the dehydration part is connected to the negative pole of the high-frequency DC power supply 11, and the tubular anode 7 is connected to the positive pole of the high-frequency DC power supply 11 to form a parallel DC electric field on the sludge; due to the action of the electric field, water moves from the tubular anode 7 to the grid-shaped cathode 9; under the obstruction of the throttling action of the back pressure plate 10 and the spiral pushing of the conveying screw shaft 3, a pressure of 0.2 - 0.7 MPa is formed between the tubular anode 7 and the grid-shaped cathode 9, and the sludge is in close contact with the tubular anode 7 and the grid-shaped cathode 9, forcing the water to flow out from the gaps of the grid-shaped cathode 9.

[0064] At the same time, the vacuum pulsation system composed of the intake solenoid valve 12, the condenser 13, and the vacuum pump 14 is also operating. The vacuum pump 14 evacuates the air between the sealed housing 2 and the grid-shaped cathode 9 to form a vacuum environment with a vacuum degree less than 0.095 MPa; due to the heating effect of the DC electric field, the temperature of the sludge is between 60 - 70 °C. The water in the sludge reaches the boiling point and vaporizes under this vacuum degree and temperature, and the sludge is dehydrated; the steam is cooled and liquefied by the condenser 13 and discharged. The intake solenoid valve 12 and the vacuum pump 14 work together to form a cycle state of intake - vacuum pumping and pressure relief, achieving the effect of pulsating vacuum dehydration. Each time the vacuum system evacuates the air, the air in the sealed housing 2 and the grid-shaped cathode 9 is replaced once, destroying the balance state of the water distribution in the sludge and accelerating the loss of water in the material.

[0065] Meanwhile, due to the movement of the sludge under the spiral action of the intermittent insulating spiral blade group 6 and being obstructed by the agitator 8, a stirring and mixing effect is generated, causing redox reaction oxides to form on the surface of the tubular anode 7 and being evenly mixed in the sludge. The anodic oxidation gas is discharged from the gaps of the grid-type cathode 9, solving the problems of difficult exclusion of the anodic oxidation gas and attachment of oxides. Since the tubular anode 7 and the grid-type cathode 9 are fixed, while the sludge slides relative to the tubular anode 7 and the grid-type cathode 9, due to the effect of friction, the oxides on the surface of the tubular anode 7 and the scale on the surface of the grid-type cathode 9 can be timely removed and carried away, thereby greatly improving the dehydration efficiency and reducing the energy consumption.

[0066] Since the entire equipment has a fully enclosed structure and adopts electroosmotic dehydration and low-temperature pulsating vacuum dehydration technologies, the possibility of contact between the sludge to be treated and the outside world is isolated, reducing environmental pollution and exhaust gas emissions.

Claims

1. A spiral electroosmotic dehydrator, characterized in that, It mainly includes a sludge conveying part and a dewatering part, and also includes a driving motor and a sealed housing; the sludge conveying part mainly includes a driving motor and a conveying spiral shaft connected to each other; the dewatering part includes an intermittent insulating spiral blade group, a tubular anode, a stirrer, a grid-shaped cathode, a back pressure plate, a high-frequency DC power supply, an intake solenoid valve, a cooler and a vacuum pump; the conveying spiral shaft is arranged inside the sealed housing and on the central axis of the front and middle parts; the grid-shaped cathode is cylindrical and arranged inside the sealed housing at the rear part, and there is a certain gap between the sealed housing and the grid-shaped cathode; the tubular anode is arranged on the central axis inside the cylinder of the grid-shaped cathode; the conveying spiral shaft is connected to the tubular anode; an intermittent insulating spiral blade group is arranged on the tubular anode; the stirrer is arranged inside the grid-shaped cathode, and the protruding teeth of the stirrer are inserted between the intermittent insulating spiral blade groups on the tubular anode; the grid-shaped cathode is connected to the negative pole of the high-frequency DC power supply, and the tubular anode is connected to the positive pole of the high-frequency DC power supply; a back pressure plate for generating pressure in the dewatering cavity is arranged at the sludge outlet; an air inlet pipe communicating with the atmosphere is arranged at the bottom of the sealed housing, and an intake solenoid valve is arranged on this air inlet pipe; an air extraction pipe is arranged at the bottom of the sealed housing, and this air extraction pipe is connected to the vacuum pump through a condenser; the grid-shaped cathode is composed of two semi-cylinders spliced together, and stirrers are respectively installed at the upper and lower splicing parts of the two semi-cylinders. The grid-shaped cathode and the stirrer are fixed into one body by bolts or fixing parts and installed on the sealed housing; the two semi-cylinders of the grid-shaped cathode are arranged and combined by a row of screen bars with trapezoidal cross-sections welded on them; the screen bars with trapezoidal cross-sections are distributed along the circumference to form a filter body.

2. The spiral electroosmotic dewatering machine according to claim 1, characterized in that, The conveying spiral shaft and the tubular anode are connected by an insulating coupling.

3. The spiral electroosmotic dehydrator according to claim 1 or 2, characterized in that, On the tubular anode, a double spiral blade group composed of two single spiral blades fixed on the tubular anode with a 180° stagger at a certain interval is arranged, that is, an intermittent insulating spiral blade group.

4. The spiral electroosmotic dewatering machine according to claim 3, characterized in that, The angle between adjacent double spiral blade groups is 90°.

5. The spiral electroosmotic dehydrator according to claim 3, characterized in that, The spiral lead angle of each spiral blade of the intermittent insulating spiral blade group is between 10° and 20°.

6. The spiral electroosmotic dehydrator according to claim 3, wherein, The material of each spiral blade of the intermittent insulating spiral blade group is an insulating material, and its resistivity is greater than 1010 Ω·m; the cross-sectional shape of each spiral blade is trapezoidal.

7. The spiral electroosmotic dehydrator according to claim 3, characterized in that Each spiral blade of the intermittent insulating spiral blade group is fixed on the tubular anode by bolts.

8. The spiral electroosmotic dehydrator according to claim 1, wherein Radial outer flanges are provided at the left and right ends of the two semi-cylinders of the grid-shaped cathode; bolt holes for connecting with the sealed housing are provided on the radial outer flanges; axial outer flanges are provided at the upper and lower ends of the two semi-cylinders of the grid-shaped cathode; bolt holes for splicing and connecting with the stirrer are provided on the axial outer flanges; the sealed housing and the grid-shaped cathode are fixed by bolts installed on the radial outer flanges; the grid-shaped cathode and the stirrer are fixed by bolts installed on the axial outer flanges.

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