Marine dredged mud dehydration and solidification device and working method thereof

Abstract

A marine dredged mud dehydration and solidification device and a working method thereof, relate to the technical field of marine dredged mud treatment, and include a mixing device, a solid-liquid screening device and a mud solidification tank. The marine dredged mud is collected and mixed by the mixing device, and the solid-liquid screening device dehydrates the mixed mud slurry and solidifies it in the mud solidification tank to obtain a marine dredged mud resource product, thereby achieving the effect of utilizing the marine dredged mud after treating the dredged mud.

Description

Technical Field

[0001] The invention relates to the technical field of marine dredged mud treatment, and in particular to a marine dredged mud dehydration and solidification device and a working method thereof. Background Art

[0002] With the rapid growth of port, waterway, ocean and coastal engineering construction and maintenance projects in my country, the total amount of dredged sludge from coastal ports has increased year by year. The annual output of dredged sludge in the Pearl River Delta alone has reached hundreds of millions of square meters. However, dredged sludge from coastal ports is a key issue in keeping coastal ports and waterways unobstructed. Dredged sludge has the characteristics of high natural water content, high compressibility, low permeability, low strength and high porosity. During normal construction, it has low bearing capacity, large sedimentation and poor stability. It is difficult to be used directly as engineering material without treatment. Therefore, how to process dredged sludge and realize the utilization of marine dredged sludge is an urgent problem to be solved. Summary of the invention

[0003] The embodiment of the present invention provides a marine dredged mud dehydration and solidification device and a working method thereof, which collects, dehydrates and solidifies the marine dredged mud to obtain a marine dredged mud resource product, thereby achieving the effect of utilizing the marine dredged mud after processing the dredged mud.

[0004] A marine dredged mud dehydration and solidification device, comprising:

[0005] A mixing device, the mixing device comprising a mud pump, a mixing tank, a stirrer, a sand collecting hopper, a movable door, a sand storage tank, a platform and a mounting plate;

[0006] Wherein, the mixing tank is arranged on one side of the top of the platform, the sand collecting hopper is communicated with the bottom of the mixing tank, the movable door is arranged at the bottom of the sand collecting hopper, the mud pump is arranged on one side of the top of the mixing tank, and is used to transport the sludge to the inside of the mixing tank through a pipeline, the agitator is installed on the middle part of the top of the mixing tank through a mounting plate, and is used to stir the sludge inside the mixing tank to obtain sludge homogenization, the agitator comprises a stirring motor, a stirring blade and a stirring rod, the stirring motor is installed on the mounting plate, one end of the stirring rod is connected to the output end of the stirring motor, and the other end of the stirring rod extends to the inside of the mixing tank, the stirring blade is arranged on the stirring rod, and the sand storage tank is arranged directly below the movable door;

[0007] A solid-liquid screening device, the solid-liquid screening device comprising a mud pump, a conveyor-type filter screen, a liquid storage tank, a cleaning device, a scraper, a fixing frame, a mounting frame, a fixing rod and a separation device;

[0008] Wherein, the liquid reservoir is arranged at the middle of the top of the platform, the mud discharge pump is arranged at the other side of the top of the mixing tank, the mounting frame is arranged at one side of the top of the liquid reservoir, the conveyor belt filter screen and the fixing frame are arranged on the mounting frame in sequence, the scraper is installed at the top of the fixing frame at an angle, one side of the scraper contacts the surface of the conveyor belt filter screen, the cleaning device is arranged inside the liquid reservoir, the cleaning device comprises a water pump and a cleaning pipe, the water pump is arranged at the bottom of the inner wall of the liquid reservoir, the output end of the water pump is connected with one end of the cleaning pipe, and the other end of the cleaning pipe is connected with one side of the liquid reservoir, the separation device is fixedly arranged at the other side of the top of the liquid reservoir at an angle, and the other side of the scraper is located directly above the input end of the separation device;

[0009] The sludge solidification pool is arranged on the other side of the top of the platform, and the output end of the separation device is communicated with the sludge solidification pool.

[0010] Furthermore, the cleaning device is used to input the sludge filtrate inside the liquid storage tank into the interior of the mixing tank.

[0011] Furthermore, the agitator stirs and mixes the sludge in the mixing tank for 10 minutes to 20 minutes.

[0012] Furthermore, the sludge pump is used to input the sludge slurry inside the mixing tank to the conveyor belt filter screen for filtration through a pipeline.

[0013] Furthermore, the separation device includes a feed end, a first connecting elbow, a screening drum, a second connecting elbow, a gear ring, a driving motor, a gear, a bearing and a mud discharge pipe. The surface of the screening drum is provided with a through hole connected to the interior. The first connecting elbow is fixedly connected to the liquid storage tank through a fixing rod. The feed end is connected to one end of the first connecting elbow. The other end of the first connecting elbow is plugged into the interior of one end of the screening drum. One end of the second connecting elbow is plugged into the interior of the other end of the screening drum. The first connecting elbow, the second connecting elbow and the screening drum are connected through the bearing. One end of the mud discharge pipe is connected to the other end of the second connecting elbow. The other end of the mud discharge pipe passes through the liquid storage tank and is connected to the sludge solidification tank. The gear ring is arranged on one end of the screening drum close to the second connecting elbow. The driving motor is arranged at the bottom of the second connecting elbow. The gear is installed on the output shaft of the driving motor, and the gear is meshed with the gear ring.

[0014] Furthermore, the separation device also includes a connecting rod and a water baffle, the connecting rod is respectively arranged on the first connecting elbow and the second connecting elbow, and the water baffle is installed on the top of the connecting rod.

[0015] Furthermore, the water retaining plate is an arc-shaped plate.

[0016] In a second aspect, an embodiment of the present invention provides a working method of a marine dredged mud dehydration and solidification device, comprising the following steps:

[0017] Step 1, sucking sludge, the sludge pump sucks the sludge into the mixing tank, and at the same time, the cleaning device arranged inside the liquid storage tank inputs the sludge filtrate into the mixing tank;

[0018] Step 2, stirring, mixing the sludge and the sludge filtrate in step 1 with an agitator to obtain a sludge homogenate, the mixing time being 10 min-20 min;

[0019] Step 3, standing and separating, stopping stirring and standing for 3 minutes, the inorganic impurities with high density in the sludge homogenate in step 2 are settled into the sand collecting hopper, and the movable door is opened to discharge them into the sand storage tank;

[0020] Step 4, solid-liquid separation, the sludge homogenate in step 2 is transported to a conveyor filter screen through a sludge pump for solid-liquid screening, the sludge that has undergone the first solid-liquid separation is transported to the feed end by a scraper, the sludge enters the screening cylinder through the first connecting elbow, the driving motor drives the screening cylinder to rotate to perform a second solid-liquid separation on the sludge that has entered the interior, and then the sludge is discharged to a sludge solidification tank through a sludge discharge pipe through a second connecting elbow, and a solidifying material is added to the sludge solidification tank for mixing and solidification to obtain a marine dredged sludge resource product;

[0021] Step 5, sludge filtrate treatment, the sludge filtrate screened by the conveyor belt filter screen in step 4 and the sludge filtrate of the separation device enter the interior of the storage tank, part of the sludge filtrate of the storage tank is input into the interior of the mixing tank through the cleaning device, and the excess filtrate is directly discharged into the seawater.

[0022] Furthermore, the volume of liquid input from the liquid storage tank to the mixing tank by the cleaning device is 1 to 1.5 times the volume of sludge inside the mixing tank.

[0023] Further, the solidified material includes waste concrete, natural crushed stone and pebbles.

[0024] The beneficial effects of the above technical solution provided by the embodiment of the present invention include at least: mixing the marine dredged sludge and the sludge filtrate for 10 min-20 min through a mixing device to obtain a sludge slurry, a solid-liquid screening device to separate the solid and liquid of the sludge slurry, and the obtained sludge filtrate is re-input into the mixing device for reuse, and the obtained sludge solid is mixed with a solidifying material to obtain a resource product, and the resource product can be used for earthwork in engineering construction, thereby achieving the effect of utilizing the marine dredged sludge after processing the dredged sludge.

[0025] Other features and advantages of the present invention will be described in the following description, and partly become apparent from the description, or understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained by the structures particularly pointed out in the written description, claims, and drawings.

[0026] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0028] Figure 1 It is a structural schematic diagram of a marine dredged mud dehydration and solidification device disclosed in an embodiment of the present invention;

[0029] Figure 2 for Figure 1 A is an enlarged schematic diagram of the structure;

[0030] Figure 3 It is a schematic diagram of the structure of the separation device disclosed in an embodiment of the present invention;

[0031] Figure 4 It is a schematic cross-sectional structural diagram of a separation device disclosed in an embodiment of the present invention;

[0032] Figure 5 The present invention is a schematic flow chart of the working method of the marine dredged mud dehydration and solidification device disclosed in an embodiment of the present invention.

[0033] Reference numerals:

[0034] 1. Mixing device; 11. Mud pump; 12. Mixing tank; 13. Agitator; 131. Agitator motor; 132. Agitator blade; 133. Agitator rod; 14. Sand collecting hopper; 15. Movable door; 16. Sand storage tank; 17. Platform; 18. Mounting plate; 2. Solid-liquid screening device; 21. Mud pump; 22. Conveyor filter screen; 23. Liquid storage tank; 24. Cleaning device; 241. Water pump; 242. Cleaning pipe; 25, scraper; 26, fixed frame; 27, mounting frame; 28, fixed rod; 29, separation device; 291, feed end; 292, first connecting elbow; 293, screening cylinder; 294, second connecting elbow; 295, connecting rod; 296, water retaining plate; 297, gear ring; 298, driving motor; 299, gear; 2910, bearing; 2911, mud discharge pipe; 3, sludge solidification tank. DETAILED DESCRIPTION

[0035] The exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0036] Embodiment 1

[0037] like Figure 1-4 As shown, an embodiment of the present invention provides a marine dredged mud dehydration and solidification device, including: a mixing device 1, the mixing device 1 includes a mud pump 11, a mixing tank 12, a stirrer 13, a sand collecting hopper 14, a movable door 15, a sand storage tank 16, a platform 17 and a mounting plate 18, the mixing tank 12 is arranged on one side of the top of the platform 17, the sand collecting hopper 14 is connected to the bottom of the mixing tank 12, the movable door 15 is arranged at the bottom of the sand collecting hopper 14, and the mud pump 11 is arranged on one side of the top of the mixing tank 12, and is used to transport the silt to the inside of the mixing tank 12 through a pipeline. The agitator 13 is installed at the middle of the top of the mixing tank 12 through the mounting plate 18, and is used to stir the sludge inside the mixing tank 12 to obtain sludge homogenization. The agitator 13 includes a stirring motor 131, a stirring blade 132 and a stirring rod 133. The stirring motor 131 is installed on the mounting plate 18, one end of the stirring rod 133 is connected to the output end of the stirring motor 131, and the other end of the stirring rod 133 extends to the inside of the mixing tank 12. The stirring blade 132 is arranged on the stirring rod 133, and the sand storage tank 16 is arranged directly below the movable door 15;

[0038] It should be noted that the agitator 13 stirs and mixes the sludge inside the mixing tank 12 for 10 minutes to 20 minutes. When discharging the high-density inorganic impurities inside the sand collecting hopper 14, the sludge inside the mixing tank 12 is pumped out by the mud discharge pump 21 and then the movable door 15 is opened to discharge the high-density inorganic impurities inside the sand collecting hopper 14 into the sand storage tank 16.

[0039] The solid-liquid screening device 2 includes a mud pump 21, a conveyor filter screen 22, a liquid storage tank 23, a cleaning device 24, a scraper 25, a fixing frame 26, a mounting frame 27, a fixing rod 28 and a separation device 29;

[0040] The liquid reservoir 23 is arranged at the middle of the top of the platform 17, the mud pump 21 is arranged at the other side of the top of the mixing tank 12, the mounting frame 27 is arranged at one side of the top of the liquid reservoir 23, the conveyor belt filter screen 22 and the fixing frame 26 are arranged on the mounting frame 27 in sequence, the scraper 25 is installed at the top of the fixing frame 26 in an inclined manner, and one side of the scraper 25 contacts the surface of the conveyor belt filter screen 22. The cleaning device 24 is arranged inside the liquid reservoir 23, and the cleaning device 24 includes a water pump 241 and a cleaning pipe 242. The water pump 241 is arranged at the bottom of the inner wall of the liquid reservoir 23, the output end of the water pump 241 is connected to one end of the cleaning pipe 242, and the other end of the cleaning pipe 242 is connected to one side of the liquid reservoir 23. The separation device 29 is fixedly arranged at the other side of the top of the liquid reservoir 23 in an inclined manner, and the other side of the scraper 25 is located directly above the input end of the separation device 29;

[0041] It should be noted that the cleaning device 24 is used to input the sludge filtrate in the liquid storage tank 23 into the mixing tank 12, and the sludge pump 21 is used to input the sludge slurry in the mixing tank 12 to the conveyor filter screen 22 through a pipeline for filtration.

[0042] The sludge solidification pool 3 is arranged on the other side of the top of the platform 17 , and the output end of the separation device 29 is connected to the sludge solidification pool 3 .

[0043] The separation device 29 includes a feed end 291, a first connecting elbow 292, a screening drum 293, a second connecting elbow 294, a gear ring 297, a drive motor 298, a gear 299, a bearing 2910 and a mud discharge pipe 2911. The surface of the screening drum 293 is provided with a through hole connected to the interior. The first connecting elbow 292 is fixedly connected to the liquid storage tank 23 through a fixing rod 28. The feed end 291 is connected to one end of the first connecting elbow 292, and the other end of the first connecting elbow 292 is plugged into the interior of one end of the screening drum 293. One end of the second connecting elbow 294 is plugged into the interior of the other end of the screening drum 293. The first connecting elbow 292, the second connecting elbow 294 and the screening drum 293 are connected. The two ends of the second connecting elbow 294 are connected by a bearing 2910, one end of the mud discharge pipe 2911 is communicated with the other end of the second connecting elbow 294, the other end of the mud discharge pipe 2911 passes through the liquid storage tank 23 and is communicated with the sludge solidification tank 3, the gear ring 297 is arranged on the screening cylinder 293 near one end of the second connecting elbow 294, the driving motor 298 is arranged at the bottom of the second connecting elbow 294, the gear 299 is installed on the output shaft of the driving motor 298, the gear 299 is meshed with the gear ring 297, the separation device 29 also includes a connecting rod 295 and a water baffle 296, the connecting rod 295 is respectively arranged on the first connecting elbow 292 and the second connecting elbow 294, and the water baffle 296 is installed on the top of the connecting rod 295;

[0044] It should be noted that the water retaining plate 296 is an arc-shaped plate, the input end of the separation device 29 is the feed end 291, the output end of the separation device 29 is the mud discharge pipe 2911, and the driving motor 298 is used to drive the screening drum 293 to rotate, centrifuge the sludge inside the screening drum 293, and perform solid-liquid separation on the sludge inside the screening drum 293. In the process of the driving motor 298 driving the screening drum 293 to rotate, the rotation speed of the driving motor 298 first increases uniformly and then decreases uniformly. In the process of the uniform increase in speed, the sludge is centrifugally dehydrated, and in the process of the uniform decrease in speed, the sludge is discharged from the second connecting elbow 294 to the mud discharge pipe 2911 under the action of gravity to the sludge solidification tank 3.

[0045] Embodiment 2

[0046] like Figure 1-5 As shown, the embodiment of the present invention also discloses a working method of a marine dredged mud dehydration and solidification device, comprising the following steps:

[0047] Step 1, sucking sludge, the sludge pump 11 sucks the sludge into the mixing tank 12, and at the same time, the cleaning device 24 arranged inside the liquid storage tank 23 inputs the sludge filtrate into the mixing tank 12;

[0048] Step 2, stirring, the stirrer 13 mixes the sludge and the sludge filtrate in step 1 to obtain a sludge homogenate, and the mixing time is 10 min-20 min;

[0049] Step 3, standing and separating, stopping stirring and standing for 3 minutes, the inorganic impurities with high density in the sludge homogenate in step 2 are settled into the sand collecting hopper 14, and the movable door 15 is opened to discharge them into the sand storage tank 16;

[0050] Step 4, solid-liquid separation, the sludge slurry in step 2 is transported to the conveyor filter screen 22 through the sludge pump 21 for solid-liquid screening, the sludge that has undergone the first solid-liquid separation is transported to the feed end 291 by the scraper 25, the sludge enters the screening cylinder 293 through the first connecting elbow 292, the driving motor 298 drives the screening cylinder 293 to rotate to perform a second solid-liquid separation on the sludge entering the inside, and then the sludge is discharged to the sludge solidification tank 3 through the second connecting elbow 294 through the sludge pipe 2911, and the solidified material is added to the sludge solidification tank 3 and mixed and then solidified to obtain the marine dredged sludge resource product, in the mixing process, the solidified material added to the sludge solidification tank 3 is mixed with the sludge by a stirring device or other stirring methods, and the sludge is solidified after it is completely dried to obtain the marine dredged sludge resource product for engineering construction;

[0051] It should be noted that the solidified materials include waste concrete, natural crushed stones and pebbles.

[0052] Step 5, sludge filtrate treatment, the sludge filtrate screened by the conveyor filter 22 in step 4 and the sludge filtrate of the separation device 29 enter the interior of the storage tank 23, part of the sludge filtrate of the storage tank 23 is input into the interior of the mixing tank 12 through the cleaning device 24, and the excess filtrate is directly discharged into the seawater.

[0053] It should be noted that the volume of the liquid input from the liquid storage tank 23 to the mixing tank 12 by the cleaning device 24 is 1 to 1.5 times the volume of the sludge inside the mixing tank 12 .

[0054] The specific working principle is that after the mud pump 11 sucks the sludge and inputs it into the mixing tank 12, the cleaning device 24 inputs the sludge filtrate in the liquid storage tank 23 into the interior of the mixing tank 12, and the agitator 13 stirs the sludge for 10min-20min to obtain a sludge slurry. After standing for 3min, the inorganic impurities with high density settle to the sand collecting hopper 14 and are discharged to the sand storage tank 16 by the movable door 15 for collection. The sludge slurry is transported to the conveyor filter screen 22 by the mud pump 21, and the conveyor filter screen 22 performs solid-liquid screening. After the first solid-liquid separation, the sludge is transported to the feed end 291 by the scraper 25, and the sludge passes through the first connecting elbow 29 2 enters the screening drum 293, and the driving motor 298 drives the screening drum 293 to rotate to perform a second solid-liquid separation on the sludge entering the inside, and then the sludge is discharged to the sludge solidification pool 3 through the second connecting elbow 294 through the sludge discharge pipe 2911, and solidifying materials are added to the sludge solidification pool 3 and mixed and solidified to obtain the marine dredged sludge resource product, and the sludge solid inside the sludge storage tank of the sludge solidification pool 3 is mixed with the solidifying materials to obtain the resource product, and the marine dredged sludge resource product obtained by collecting, dehydrating and solidifying the marine dredged sludge achieves the effect of utilizing the marine dredged sludge after processing the dredged sludge.

[0055] It should be noted that the specific models and specifications of the mud pump 11, stirring motor 131, mud discharge pump 21, conveyor filter screen 22, water pump 241 and drive motor 298 need to be selected and determined according to the actual specifications of the device. The specific selection calculation method adopts the existing technology in this field, so it will not be described in detail.

[0056] The power supply and principles of the mud pump 11, the stirring motor 131, the mud discharge pump 21, the conveyor filter screen 22, the water pump 241 and the drive motor 298 are clear to those skilled in the art and will not be described in detail here.

[0057] The above description includes examples of one or more embodiments. Of course, it is impossible to describe all possible combinations of components or methods for the purpose of describing the above embodiments, but it should be recognized by those skilled in the art that the various embodiments may be further combined and arranged. Therefore, the embodiments described herein are intended to cover all such changes, modifications and variations that fall within the scope of protection of the appended claims. In addition, with respect to the term "comprising" used in the specification or claims, the word is covered in a manner similar to the term "including", just as "including," is explained as a transitional word in the claims. In addition, any term "or" used in the specification of the claims is intended to mean "non-exclusive or".

Claims

1. A marine dredged mud dehydration and solidification device, characterized in that: include: A mixing device (1), the mixing device (1) comprising a mud pump (11), a mixing tank (12), a stirrer (13), a sand collecting hopper (14), a movable door (15), a sand storage tank (16), a platform (17) and a mounting plate (18); The mixing tank (12) is arranged on one side of the top of the platform (17), the sand collecting hopper (14) is connected to the bottom of the mixing tank (12), the movable door (15) is arranged at the bottom of the sand collecting hopper (14), the mud pump (11) is arranged on one side of the top of the mixing tank (12) and is used to transport the sludge to the inside of the mixing tank (12) through a pipeline, and the agitator (13) is installed at the middle of the top of the mixing tank (12) through a mounting plate (18) and is used to agitate the sludge in the mixing tank (12). Stirring to obtain sludge homogenization, the stirrer (13) comprising a stirring motor (131), a stirring blade (132) and a stirring rod (133), the stirring motor (131) being mounted on the mounting plate (18), one end of the stirring rod (133) being connected to the output end of the stirring motor (131), the other end of the stirring rod (133) extending into the interior of the mixing tank (12), the stirring blade (132) being arranged on the stirring rod (133), and the sand storage tank (16) being arranged directly below the movable door (15); A solid-liquid screening device (2), the solid-liquid screening device (2) comprising a mud discharge pump (21), a conveyor-type filter screen (22), a liquid storage tank (23), a cleaning device (24), a scraper (25), a fixing frame (26), a mounting frame (27), a fixing rod (28) and a separation device (29); The liquid storage tank (23) is arranged at the middle of the top of the platform (17), the mud discharge pump (21) is arranged at the other side of the top of the mixing tank (12), the mounting frame (27) is arranged at one side of the top of the liquid storage tank (23), the conveyor belt filter screen (22) and the fixing frame (26) are arranged on the mounting frame (27) in sequence, the scraper (25) is installed at an angle on the top of the fixing frame (26), one side of the scraper (25) is in contact with the surface of the conveyor belt filter screen (22), and the cleaning device (24) is arranged at the top of the liquid storage tank (23). Inside the liquid tank (23), the cleaning device (24) comprises a water pump (241) and a cleaning pipe (242), the water pump (241) is arranged at the bottom of the inner wall of the liquid storage tank (23), the output end of the water pump (241) is connected to one end of the cleaning pipe (242), and the other end of the cleaning pipe (242) is connected to one side of the liquid storage tank (23), the separation device (29) is fixedly arranged at an angle on the other side of the top of the liquid storage tank (23), and the other side of the scraper (25) is located directly above the input end of the separation device (29); The sludge solidification pool (3) is arranged on the other side of the top of the platform (17), and the output end of the separation device (29) is connected to the sludge solidification pool (3); The separation device (29) comprises a feed end (291), a first connecting elbow (292), a screening drum (293), a second connecting elbow (294), a gear ring (297), a drive motor (298), a gear (299), a bearing (2910) and a mud discharge pipe (2911); a through hole communicating with the interior is provided on the surface of the screening drum (293); the first connecting elbow (292) is fixedly connected to the liquid storage tank (23) via a fixing rod (28); the feed end (291) is communicated with one end of the first connecting elbow (292); the other end of the first connecting elbow (292) is plugged into the interior of one end of the screening drum (293); and one end of the second connecting elbow (294) is plugged into the other end of the screening drum (293). inside, the first connecting elbow (292), the second connecting elbow (294) and the screening drum (293) are connected via the bearing (2910), one end of the mud discharge pipe (2911) is in communication with the other end of the second connecting elbow (294), the other end of the mud discharge pipe (2911) passes through the liquid storage tank (23) and is in communication with the sludge solidification tank (3), the gear ring (297) is arranged on one end of the screening drum (293) close to the second connecting elbow (294), the drive motor (298) is arranged at the bottom of the second connecting elbow (294), the gear (299) is mounted on the output shaft of the drive motor (298), and the gear (299) is meshed with the gear ring (297); The separation device (29) further comprises a connecting rod (295) and a water baffle (296); the connecting rod (295) is respectively arranged on the first connecting elbow (292) and the second connecting elbow (294); and the water baffle (296) is installed on the top of the connecting rod (295).

2. The marine dredged mud dehydration and solidification device according to claim 1, characterized in that: The cleaning device (24) is used to input the sludge filtrate in the liquid storage tank (23) into the mixing tank (12).

3. The marine dredged mud dehydration and solidification device according to claim 1, characterized in that: The time for the stirrer (13) to stir and mix the sludge inside the mixing tank (12) is 10 minutes to 20 minutes.

4. The marine dredged mud dehydration and solidification device according to claim 1, characterized in that: The sludge discharge pump (21) is used to input the sludge slurry inside the mixing tank (12) to the conveyor belt filter screen (22) through a pipeline for filtering.

5. The marine dredged mud dehydration and solidification device according to claim 1, characterized in that: The water retaining plate (296) is a curved plate.

6. A working method of a marine dredged mud dehydration and solidification device, using a marine dredged mud dehydration and solidification device as claimed in any one of claims 1 to 5, characterized in that: The following steps are involved: Step 1, sucking sludge, the sludge pump (11) sucks the sludge into the mixing tank (12), and at the same time, the cleaning device (24) arranged inside the liquid storage tank (23) inputs the sludge filtrate into the mixing tank (12); Step 2, stirring, the stirrer (13) mixes the sludge and the sludge filtrate in step 1 to obtain a sludge homogenate, and the mixing time is 10 min-20 min; Step 3, standing and separating, stopping stirring and standing for 3 minutes, the inorganic impurities with high density in the sludge homogenate in step 2 are settled into the sand collecting hopper (14), and the movable door (15) is opened to discharge them into the sand storage tank (16); Step 4, solid-liquid separation, the sludge slurry in step 2 is transported to a conveyor filter screen (22) through a sludge discharge pump (21) for solid-liquid screening, the sludge that has undergone the first solid-liquid separation is transported to a feed end (291) through a scraper (25), the sludge enters a screening drum (293) through a first connecting elbow (292), the driving motor (298) drives the screening drum (293) to rotate to perform a second solid-liquid separation on the sludge that has entered the interior, and then the sludge is discharged to a sludge solidification tank (3) through a second connecting elbow (294) through a sludge discharge pipe (2911), and a solidifying material is added to the sludge solidification tank (3) for mixing and solidification to obtain a marine dredged sludge resource product; Step 5, sludge filtrate treatment, the sludge filtrate screened by the conveyor filter screen (22) in step 4 and the sludge filtrate of the separation device (29) enter the interior of the storage tank (23), part of the sludge filtrate of the storage tank (23) is input into the interior of the mixing tank (12) through the cleaning device (24), and the excess filtrate is directly discharged into the seawater.

7. The working method of the marine dredged mud dehydration and solidification device according to claim 6, characterized in that: The volume of the liquid input from the liquid storage tank (23) to the mixing tank (12) by the cleaning device (24) is 1 to 1.5 times the volume of the sludge inside the mixing tank (12).

8. The working method of the marine dredged mud dehydration and solidification device according to claim 6, characterized in that: The solidification materials include waste concrete, natural crushed stone and pebbles.

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