Dredged soil separation, consolidation and dehydration integrated device and working method

Abstract

The invention discloses a dredged soil separation, consolidation and dehydration integrated device and a working method, the dredged soil separation, consolidation and dehydration integrated device comprises: a cyclone separation module for completing preliminary solid-liquid separation of dredged mud under the action of centrifugal force; the stirring consolidation module is used for mixing and stirring the thick slurry separated by the cyclone separation module and a curing agent to quickly consolidate the thick slurry to obtain dredged soil paste; and the roller drying module is used for drying and dewatering the dredging soil paste, and the conveying directions of the dredging soil paste and the drying gas in the roller are opposite. During working, the cyclone separation module is used for carrying out primary solid-liquid separation on dredged mud; feeding the separated thick slurry into a stirring consolidation module, and mixing and stirring the thick slurry with a curing agent to quickly consolidate the thick slurry to obtain dredged soil paste; and the dredged soil paste obtained through stirring and consolidation is fed into a roller drying module to be subjected to rotary drying. Through the multi-stage treatment process and progressive layer by layer, the recycling working time of the dredged soil can be quickly shortened, and the quality of the dredged soil can be remarkably improved.

Description

Technical Field

[0001] The invention relates to the technical field of dredging engineering, and in particular to an integrated device for separation, consolidation and dehydration of dredged soil and a working method. Background Art

[0002] With the continuous development of water resources along the rivers and coasts of my country, a large amount of dredged soil has been produced. These dredged soils usually have high water content and high compressibility. Traditionally, they are mostly disposed of by dumping them in designated waters, but this will cause environmental and ecological damage, and the capacity of the mud dumping site is close to saturation. Dredged soil mainly comes from the dredging process of ports, waterways, lakes and oceans. In particular, the amount of dredged silt produced in the Pearl River Delta region reaches hundreds of millions of cubic meters each year. Due to the high water content, high clay content, low strength, and certain pollutants of dredged silt, it is difficult to use it directly in engineering applications and needs to be treated or disposed of. Existing disposal methods include marine mud dumping, land reclamation and resource treatment, but each has its limitations. Among them, marine mud dumping faces the dilemma of saturated dumping area capacity and difficulty in finding new dumping areas; land reclamation requires high-cost foundation treatment due to the high water content of silt, and the construction period is long; resource treatment methods such as mechanical dehydration, brick burning, and ceramsite making have limited processing capacity and are difficult to treat silt on a large scale.

[0003] However, existing dredged soil dehydration and solidification equipment has a number of technical defects, which limit its efficiency, effectiveness and applicability.

[0004] (1) Low processing efficiency and long processing time

[0005] Traditional equipment often uses natural sedimentation or simple filtration methods to separate solids from liquids, which is slow and difficult to efficiently handle large volumes of dredged mud. The solidification process is usually completed by adding a curing agent and then drying it naturally, which is time-consuming, occupies a large area, and is subject to weather conditions, significantly extending the overall recycling cycle.

[0006] (2) Poor separation effect and low product quality

[0007] The current solid-liquid separation technology is difficult to effectively remove fine particles, resulting in high residual moisture content in the concentrated slurry, which affects the subsequent solidification and dehydration effects. In addition, the solidifying agent and the concentrated slurry are not mixed evenly in the traditional system, the consolidation effect is unstable, and the strength and quality of the generated dredged soil products are insufficient, which is difficult to meet the needs of large-scale reuse.

[0008] (3) Low integration and complex operation

[0009] The existing dredged soil treatment process usually consists of multiple independent equipment such as separation, mixing and drying, lacking an integrated design, resulting in poor process connection, large equipment footprint and cumbersome manual operation. Most traditional systems are fixed and cannot adapt to mobile operations (such as operations on ships), limiting the flexibility of on-site dredging treatment.

[0010] (4) High energy consumption and poor economic efficiency

[0011] Traditional drying methods, such as static drying or inefficient hot air systems, have high energy consumption, slow processing speeds, and are not suitable for large-scale production. In addition, these systems have high failure rates and complex maintenance, which increases operating costs and has low economic benefits.

[0012] (5) Poor adaptability and difficulty in meeting large-scale needs

[0013] The current equipment has limited processing capacity and is unable to cope with the high-flow, high-water content mud generated by large-scale dredging projects. In addition, the existing system is not adaptable enough to different types of dredged soil, and the processing parameters are difficult to flexibly adjust, resulting in unstable processing effects and limited application scope. Summary of the invention

[0014] In order to solve the above technical problems, the present invention provides an integrated device for separation, consolidation and dehydration of dredged soil and a working method. The device can not only quickly reduce the working time of recycling and utilization of dredged soil, but also significantly improve the quality of dredged soil through a multi-stage treatment process, and through this efficient treatment method, the recycling and utilization process of dredged soil becomes more efficient and economical, and the quality of the final product is also greatly improved, meeting the needs of large-scale dredged soil recycling applications; it can be placed on a ship to work, which saves a lot of time compared with some traditional methods, greatly improves the recycling rate of dredged soil, and is more efficient and convenient.

[0015] The present invention is implemented as follows: an integrated device for separation, consolidation and dehydration of dredged soil, comprising:

[0016] Cyclone separation module: used to complete the initial solid-liquid separation of dredged mud under the action of centrifugal force, including a cyclone;

[0017] Stirring and consolidation module: used to mix and stir the concentrated slurry separated by the cyclone separation module with the curing agent to quickly consolidate the concentrated slurry to obtain dredged soil paste. The stirring and consolidation module is a vertical structure;

[0018] Drum drying module: used for drying and dehydrating the dredged soil paste, including a rotatable drum, in which the dredged soil paste and the drying gas are conveyed in opposite directions.

[0019] In the above technical scheme, preferably, it also includes a spiral transport module, which is used to transport the concentrated slurry separated by the cyclone separation module to the stirring and consolidation module; the spiral transport module includes a tubular shell and a transmission motor, the two ends of the tubular shell are respectively a feed port and a discharge port, and a spiral body composed of spiral blades and a spiral shaft is provided in the tubular shell, and the transmission motor drives the spiral body to rotate, wherein the feed port is connected to the concentrated slurry outlet of the cyclone separation module, and the discharge port is connected to the concentrated slurry inlet of the stirring and consolidation module.

[0020] In the above technical scheme, preferably, it also includes a sedimentation and filtration tank, which is used to collect the clean water and a small amount of sediment separated by the cyclone separation module for sedimentation and filtration before further treatment; the sedimentation and filtration tank is provided with an A-type lateral oblique flow plate at the bottom of the pool near the water inlet side, and a filter screen is installed near the water outlet.

[0021] In the above technical solution, preferably, a paste delivery pump is arranged between the stirring and consolidation module and the drum drying module, the inlet of the paste delivery pump is connected to the dredged soil paste outlet of the stirring and consolidation module, and the outlet of the paste delivery pump is connected to the dredged soil paste inlet of the drum drying module.

[0022] In the above technical solution, preferably, the cyclone separation module also includes a solid collection box and a liquid collection box, the thick slurry outlet of the cyclone is connected to the solid collection box, and the liquid outlet is connected to the liquid collection box; the cyclone inlet is connected to the mud conveying pipeline, and the mud conveying pipeline is provided with a valve and a pressure gauge.

[0023] In the above technical scheme, preferably, the stirring and consolidation module includes a mechanical stirrer and a stirring barrel body, the motor of the mechanical stirrer is installed on the stirring barrel body, the stirring blades extend into the stirring barrel body, the stirring barrel body is provided with a consolidating agent discharge port, a stirring barrel exhaust port and a concentrated slurry inlet, and a dredged soil paste outlet is provided at the bottom of the stirring barrel body.

[0024] In the above technical scheme, preferably, the drum drying module also includes a drum driving assembly, an exhaust fan and a dredged soil collecting bag, the drum driving assembly drives the drum to rotate, and a drum cover and a bracket are provided at both ends of the drum, and the bracket is installed under the drum cover; a dredged soil paste inlet and an exhaust hole are provided at one end of the drum, and a drying gas inlet and a dredged soil outlet are provided at the other end; the exhaust fan outlet is connected to the drying gas inlet, and the exhaust fan inlet is connected to the filter barrel; the dredged soil outlet of the drum is connected to the dredged soil collection bag.

[0025] In the above technical solution, it is further preferred that the drum driving assembly includes a driving motor, a driving gear, and a transmission gear. The transmission gear is installed on the drum, the driving motor drives the driving gear to rotate, and the driving gear is meshed with the transmission gear. The drum is placed at an angle, and two bearing supports are also arranged under the drum.

[0026] A working method of a dredged soil separation, consolidation and dehydration integrated device, comprising the following steps:

[0027] S1. Use a cyclone separation module to perform preliminary solid-liquid separation on the dredged mud, so that the water content of the separated concentrated slurry is ≤60%;

[0028] S2, sending the separated concentrated slurry to a stirring and consolidation module, mixing and stirring with a curing agent to rapidly solidify the concentrated slurry to obtain a dredged soil paste, wherein the moisture content of the dredged soil paste is ≤40%;

[0029] S3, sending the dredged soil paste obtained by stirring and consolidation into the drum drying module for rotational drying. During drying, the conveying directions of the dredged soil paste and the drying gas in the drum are opposite.

[0030] In the above technical solution, preferably, in step S1, the process parameters of the cyclone separation module are as follows:

[0031] Cyclone: ​​The speed is set at 1500-2500rpm, the solid-liquid separation efficiency is ≥90%, and the solid recovery rate is ≥85%;

[0032] Inlet pressure: controlled at 0.3-0.5 MPa, ensuring that the mud flow rate is stable at 1.2-1.8 m / s;

[0033] Separation time: single processing cycle ≤ 3 minutes, unit flow rate can reach 50 ~ 80m 3 / h;

[0034] In step S2, the process parameters of the stirring and consolidation module are as follows:

[0035] Stirring speed: The speed of the mechanical stirrer is 300-500 rpm, ensuring that the solid-liquid mixing uniformity is ≥95%;

[0036] Curing agent addition ratio: 8% to 12% of the dry weight of the concentrated slurry, curing reaction time ≤ 15 minutes;

[0037] Temperature: The mixing tank is controlled at 25-35°C;

[0038] Exhaust pressure: adjust the internal pressure of the mixing tank to normal pressure through the exhaust port;

[0039] In step S3, the process parameters of the drum drying module are as follows:

[0040] Drum: The speed is controlled at 5-12rpm, the inclination angle is 3°-8°, and the material residence time is 20-30 minutes;

[0041] Moisture content at drying end point: ≤15%.

[0042] The advantages and positive effects of the present invention are:

[0043] 1. The integrated device for separation, consolidation and dehydration of dredged soil of the present invention, through a multi-stage treatment process, first performs preliminary efficient solid-liquid separation on the dredged soil to make the water content of the concentrated slurry ≤60%, and then consolidates and stirs to make the water content of the dredged soil paste ≤40%, reduces the amount of curing agent used, shortens the stirring time, and finally performs rotary drying, and combines with the countercurrent hot air design to reduce the drying energy consumption by 20%, thereby increasing the unit processing capacity. Each stage is progressive and interlocking, which rapidly reduces the working time for recycling the dredged soil and greatly improves the quality of the dredged soil. The integrated device for separation, consolidation and dehydration of dredged soil of the present invention can also be placed on a ship for operation. Compared with the traditional method of directly adding a curing agent to the dredged soil for consolidation and then drying it, it saves a lot of time, greatly improves the recovery and utilization rate of the dredged soil, and is more efficient and convenient.

[0044] 2. The cyclone separation module of the present invention utilizes the principle of centrifugal force to achieve efficient solid-liquid separation in a short time. Compared with traditional sedimentation or filtration methods, the cyclone separation speed is faster and more efficient, and it can handle large-volume dredged mud, which is suitable for large-scale separation needs in dredged soil recovery. By connecting multiple cyclones in parallel, the processing capacity is further increased.

[0045] 3. The stirring and consolidation module of the present invention fully mixes the concentrated slurry and the curing agent in the stirring barrel through the high-speed rotation of the stirring blade, ensuring the uniform distribution of each component, achieving an ideal mixing effect, and accelerating the consolidation speed. It is designed as a vertical structure with a small footprint, suitable for use in a production environment with limited space. At the same time, the barrel body is provided with a funnel-shaped consolidating agent discharge port, which can add a suitable consolidating agent in real time, and the operation is simple and fast.

[0046] 4. The drum drying module of the present invention can quickly evaporate the water in the dredged soil paste by rotating and circulating the countercurrent hot air, with high drying efficiency and fast processing speed; it can also process a large amount of dredged soil paste materials, and is suitable for large-scale production. The speed of the drum can be adjusted by the transmission motor, and the tilt angle can be adjusted by changing the height of the brackets at both ends, so the processing volume can be flexibly controlled. The module structure is relatively simple without affecting the work efficiency, the failure rate is low during operation, and the maintenance and repair workload is small. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Figure 1 A schematic diagram of the structure of a dredged soil separation, consolidation and dehydration integrated device provided in an embodiment of the present invention;

[0048] Figure 2 A schematic diagram of the three-dimensional structure of a cyclone separation module provided in an embodiment of the present invention;

[0049] Figure 3 A schematic diagram of the three-dimensional structure of a stirring and consolidation module provided in an embodiment of the present invention;

[0050] Figure 4 A schematic diagram of the three-dimensional structure of a stirrer in a stirring and consolidation module provided in an embodiment of the present invention;

[0051] Figure 5 A schematic diagram of the three-dimensional structure of a drum drying module provided in an embodiment of the present invention;

[0052] Figure 6 A schematic diagram of the three-dimensional structure of a spiral transport module provided in an embodiment of the present invention;

[0053] Figure 7 A schematic diagram of the three-dimensional structure of a sedimentation and filtration tank provided in an embodiment of the present invention.

[0054] In the figure:

[0055] 1. Cyclone separation module; 1-1. Mud inlet; 1-2. Pressure gauge; 1-3. Cyclone; 1-4. Solid collection box; 1-5. Liquid collection box; 1-6. Valve;

[0056] 2. Water pipe;

[0057] 3. Sedimentation and filtration tank; 3-1. Water inlet; 3-2. Tank wall; 3-3. Lateral oblique flow plate; 3-4. Filter screen; 3-5. Water outlet;

[0058] 4. Screw transport module; 4-1. Transmission motor; 4-2. Feed inlet; 4-3. Screw body; 4-4. Discharge outlet;

[0059] 5. Stirring and consolidation module; 5-1. Mechanical stirrer; 5-2. Consolidation agent discharge port; 5-3. Stirring barrel exhaust port; 5-4. Thick slurry inlet; 5-5. Stirring barrel body;

[0060] 6. Paste delivery pump; 7. Paste delivery pipeline;

[0061] 8. Drum drying module; 8-1. Exhaust hole; 8-2. First bracket; 8-3. Bearing support; 8-4. Drum; 8-5. Drive motor; 8-6. Transmission gear; 8-7. Second bracket; 8-8. Dredged soil collection bag; 8-9. Exhaust fan; 8-10. Filter barrel. DETAILED DESCRIPTION

[0062] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0063] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by the terms "upper", "lower", "front", "back", "left", "right", "inside", "outside", etc. are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0064] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0065] Example

[0066] See also Figure 1 to Figure 7 The embodiment of the present invention provides a dredged soil separation, consolidation and dehydration integrated device, comprising:

[0067] Cyclone separation module 1: used to complete the preliminary solid-liquid separation of dredged mud under the action of centrifugal force, including cyclones 1-3;

[0068] Stirring and consolidating module 5: used to mix and stir the concentrated slurry separated by the cyclone separation module 1 with the curing agent to quickly consolidate the concentrated slurry to obtain dredged soil paste. The stirring and consolidating module 5 is a vertical structure;

[0069] Drum drying module 8: used for drying and dehydrating the dredged soil paste, comprising a rotatable drum 8-4, in which the dredged soil paste and the drying gas are conveyed in opposite directions in the drum 8-4.

[0070] As a preferred embodiment, it also includes a spiral transport module 4, which is used to transport the concentrated slurry separated by the cyclone separation module 1 to the stirring and consolidation module 5; the spiral transport module 4 includes a tubular shell and a transmission motor 4-1, and the two ends of the tubular shell are respectively a feed port 4-2 and a discharge port 4-4, and a spiral body 4-3 composed of spiral blades and a spiral shaft is arranged in the tubular shell, and the transmission motor 4-1 drives the spiral body 4-3 to rotate, wherein the feed port 4-2 is connected to the concentrated slurry outlet of the cyclone separation module 1, and the discharge port 4-4 is connected to the concentrated slurry inlet of the stirring and consolidation module 5.

[0071] As a preferred embodiment, it also includes a sedimentation and filtration tank 3, which is used to collect the clean water and a small amount of sediment separated by the cyclone separation module 1 and then process them after sedimentation and filtration; the bottom of the sedimentation and filtration tank 3 is provided with an A-type lateral oblique flow plate 3-3 near the water inlet 3-1, and a filter screen 3-4 is installed near the water outlet 3-5.

[0072] As a preferred embodiment, a paste conveying pump 6 is arranged between the stirring and consolidation module 5 and the drum drying module 8, the inlet of the paste conveying pump 6 is connected to the dredged soil paste outlet of the stirring and consolidation module 5, and the outlet of the paste conveying pump 6 is connected to the dredged soil paste inlet of the drum drying module 8.

[0073] As a preferred embodiment, the cyclone separation module 1 also includes a solid collection box 1-4 and a liquid collection box 1-5. The cyclone 1-3 is a hydrocyclone. The concentrated slurry outlet of the cyclone 1-3 is connected to the solid collection box 1-4, and the liquid outlet is connected to the liquid collection box 1-5; the inlet of the cyclone 1-3 is connected to the mud conveying pipeline, and a valve 1-6 and a pressure gauge 1-2 are provided on the mud conveying pipeline.

[0074] As a preferred embodiment, the stirring and consolidation module 5 includes a mechanical stirrer 5-1 and a stirring barrel body 5-5, the motor of the mechanical stirrer 5-1 is installed on the stirring barrel body 5-5, the stirring blades extend into the stirring barrel body 5-5, the stirring barrel body 5-5 is provided with a consolidating agent discharge port 5-2, a stirring barrel exhaust port 5-3 and a concentrated slurry inlet 5-4, and a dredged soil paste outlet is provided at the bottom of the stirring barrel body 5-5.

[0075] As a preferred embodiment, the drum drying module 8 also includes a drum driving assembly, an exhaust fan 8-9 and a dredged soil collection bag 8-8. The drum driving assembly drives the drum 8-4 to rotate. The drum driving assembly includes a driving motor 8-5, a driving gear, and a transmission gear 8-6. The transmission gear 8-6 is installed on the drum 8-4. The driving motor 8-5 drives the driving gear to rotate, and the driving gear is meshed with the transmission gear 8-6. Two bearing supports 8-3 are also arranged below the drum 8-4. Both ends of the drum 8-4 are provided with a drum cover and a bracket (the bracket includes a first bracket 8-2 located at one end and a second bracket 8-7 located at the other end), and the bracket is installed below the drum cover; one end of the drum is provided with a dredged soil paste inlet and an exhaust hole 8-1, and the other end is provided with a drying gas inlet and a dredged soil outlet; the outlet of the exhaust fan 8-9 is connected to the drying gas inlet, and the inlet of the exhaust fan 8-9 is connected to the filter barrel 8-10; the dredged soil outlet of the drum 8-4 is connected to the dredged soil collection bag 8-8.

[0076] Specifically, the present invention mainly includes a cyclone separation module 1, a spiral transport module 4, a stirring and consolidation module 5, a paste delivery pump 6, a drum drying module 8, a sedimentation and filtration tank 3 and corresponding other types of delivery pipeline accessories. Each module and accessory has different functions and division of labor, and together completes the consolidation, dehydration and reuse of dredged soil.

[0077] Cyclone separation module 1: It is mainly responsible for inputting dredged mud into the module and using the cyclones 1-3 built into the module to perform preliminary solid-liquid separation under the action of centrifugal force. Figure 2 As shown, its main components include three cyclones 1-3 arranged in a row. The cyclone 1-3 is responsible for cyclone separation of dredged mud. The solid collection box 1-4 is used to collect solid-liquid mixtures with higher concentrations below the cyclone 1-3. The liquid collection box 1-5 is used to collect liquids with relatively lower density. The inlet of each cyclone 1-3 is connected to a mud delivery branch pipeline, and each mud delivery branch pipeline is connected to the mud delivery main pipeline. A valve 1-6 is installed in the middle of the mud delivery branch pipeline leading to each cyclone 1-3 to adjust the flow of mud. A pressure gauge 1-2 is installed on the mud delivery main pipeline to monitor the pressure inside the pipeline.

[0078] During operation, the dredged mud is transported from the mud inlet 1-1 of the mud conveying main pipeline to the device. During the transportation process, the pressure state and the regulation work are monitored by the valve 1-6 and the pressure gauge 1-2. After the cyclone separation by the cyclone 1-3, the mud and other materials enter the solid collection box 1-4, and the separated clean water enters the liquid collection box 1-5. The liquid collection box 1-5 is connected to the water inlet 3-1 of the sedimentation and filtration tank 3 through the water pipe 2.

[0079] Sedimentation and filtration pool 3: It is mainly used to collect and precipitate the clean water and a small amount of sediment separated by the cyclone separation module 1, and then process them after filtering through the filter screen 3-4. The bottom of the pool is provided with an A-type lateral oblique flow plate 3-3 to facilitate the rapid sedimentation of sediment, and a filter screen 3-4 is installed near the water outlet 3-5 to prevent the loss of sediment.

[0080] The spiral transport module 4 is mainly used to transport the concentrated slurry (sand and other soil and a small amount of water carried) collected in the solid collection box 1-4 in the cyclone separation module 1 to the stirring consolidation module 5. Figure 6As shown, the main components include a tubular housing and a transmission motor 4-1, the bottom end of the tubular housing is a feed port 4-2, the top end is a discharge port 4-4, a spiral body 4-3 composed of spiral blades and a spiral shaft is arranged in the tubular housing, and the transmission motor 4-1 drives the spiral body 4-3 to rotate, wherein the feed port 4-2 is connected to the outlet of the solid collection box 1-4, and the discharge port 4-4 is connected to the concentrated slurry inlet 5-4 of the stirring and consolidation module 5 through a pipeline. The high-concentration solid-liquid mixture separated from the cyclone separation module 1 is obliquely transported from the feed port 4-2 through the spiral body 4-3, and the transmission motor 4-1 is responsible for providing the power source for the spiral body 4-3 to transport materials.

[0081] Mixing and consolidation module 5: It is mainly responsible for adding fly ash, slag, sodium silicate and other consolidating agents to the transported thick slurry, and quickly consolidating the thick slurry through mixing and stirring. Figure 4 As shown, the stirring and consolidating module 5 is a vertical stirring barrel structure, and the main components include a mechanical stirrer 5-1 and a stirring barrel body 5-5. The mechanical stirrer 5-1 includes a motor and stirring blades. The motor is installed on the stirring barrel body 5-5, and the stirring blades extend into the stirring barrel body 5-5. The stirring barrel body 5-5 is provided with a solidifying agent discharge port 5-2, a stirring barrel exhaust port 5-3 and a concentrated slurry inlet 5-4. Directly above the stirring barrel body 5-5, the mechanical stirrer 5-1 extends into the barrel and is responsible for mechanical stirring. The concentrated slurry inlet 5-4 is connected to the discharge port 4-4 of the spiral transport module 4, and the stirring barrel exhaust port 5-3 is responsible for regulating the pressure in the barrel. Before stirring, various types of solidifying agents enter the stirring barrel body 5-5 through the solidifying agent discharge port 5-2.

[0082] Paste delivery pump 6: It is arranged between the screw transport module 4 and the drum drying module 8, connected by the paste delivery pipeline 7, and provides a power source for transporting the dredged soil paste after stirring and initial consolidation. The paste delivery pump 6 and the paste delivery pipeline 7 are installed between the stirring and consolidation module 5 and the drum drying module 8, and are responsible for transporting the dredged soil paste completed by the stirring and consolidation module 5.

[0083] Drum drying module 8: The main function is to carry out the final step of drying and dehydration of the dredged soil paste that has been processed previously. Figure 5As shown, the main operation is that the driving motor 8-5 drives the transmission gear 8-6 through the driving gear, and then drives the drum 8-4 fixed with the transmission gear 8-6 to rotate, and at the same time, the exhaust fan 8-9 blows hot air into the drum 8-4 for drying. The left and right ends of the drum 8-4 are respectively provided with brackets, and the drum cover does not rotate with the rotation of the drum 8-4. In order to increase the supporting force of the drum 8-4, two bearing supports 8-3 are arranged under the drum 8-4, and a soil outlet is provided at the right end of the drum 8-4 to use a dredged soil collection bag 8-8 to hold the dried dredged soil. During operation, the dredged soil paste processed by the stirring and consolidation module 5 enters the drum 8-4 from the entrance on the end side of the first bracket 8-2 through the paste conveying pipe 7, and the driving motor 8-5 drives the transmission gear 8-6 fixed on the drum 8-4 to rotate through the driving gear, so as to rotate the drum 8-4. Two bearing supports 8-3 are installed under the drum 8-4 to assist in supporting the drum 8-4 structure. The exhaust fan 8-9 is responsible for delivering hot air into the drum 8-4 through the opening on the end side of the second bracket 8-7. There is a pre-filter barrel 8-10 in front of the exhaust fan 8-9. The barrel body can play a certain role in silencing. By changing the path and speed of air flow, the noise caused by air flow is reduced, thereby reducing the overall noise level of the exhaust fan 8-9 when it is working, and the inhaled air can be stabilized to a certain extent before entering the exhaust fan 8-9, reducing the turbulence of air flow and improving the working efficiency and effect of the exhaust fan 8-9. A plurality of exhaust holes 8-1 are provided on the end side of the first bracket. The module can adjust the inclination of the drum 8-4 by replacing brackets of different heights, so as to flexibly control the dredged soil processing volume. A dredged soil collection bag 8-8 is provided below the discharge port at the right end of the drum 8-4 to collect the dried dredged soil.

[0084] When the dredged soil separation, consolidation and dehydration integrated device is in use, the dredged mud enters the device from the mud inlet 1-1 of the cyclone separation module 1, and then flows through the pipeline into three parallel cyclones 1-3 for preliminary solid-liquid separation. The solid mixture gathers downward under the action of centrifugal force due to its large density, and is collected in the solid collection box 1-4 for the next step of processing. The liquid, due to its relatively small density, rises in the cyclone 1-3 to the liquid collection box 1-5, and finally flows into the sedimentation filter tank 3 through the water pipe.

[0085] As the high-concentration solid-liquid mixture in the solid collecting box 1-4 increases, the spiral transport module 4 is turned on, and the material in the solid collecting box 1-4 enters the tubular shell from the feed port 4-2. The transmission motor 4-1 drives the spiral body 4-3 in the tubular shell to rotate so that the high-concentration solid-liquid mixture is transported from the discharge port 4-4 to the stirring barrel 5-5 of the stirring and consolidation module 5. At the same time, a suitable solidifying agent is added to the solidifying agent discharge port 5-2 above the stirring barrel 5-5, and the mechanical agitator 5-1 is turned on at high speed to make the high-concentration mud and the solidifying agent react quickly in the stirring barrel 5-5. When the dredged soil mixture in the stirring barrel 5-5 forms a paste-like substance, the paste conveying pump 6 connected to the bottom of the stirring barrel 5-5 provides power to convey the dredged soil paste in the stirring barrel 5-5 to the drum drying module 8.

[0086] The dredged soil paste enters the drum 8-4 from the opening on the end side of the first bracket 8-2 of the drum drying module 8, and the driving motor 8-5 is turned on to drive the transmission gear 8-6 through the driving gear to make the drum 8-4 rotate, and the exhaust fan 8-9 is turned on at the same time. The outside air passes through the pre-filter barrel 8-10 and is heated and accelerated by the exhaust fan 8-9, and enters the drum 8-4 from the opening on the end side of the second bracket 8-7, and is discharged from the exhaust hole 8-1 on the end side of the first bracket 8-2 after passing through the drum 8-4, so as to complete the drying task. The height settings of the first bracket 8-2 and the second bracket 8-7 are different, which can change the inclination of the drum 8-4. The dredged soil paste is dried by the hot air in the drum 8-4. At the same time, because the rotating drum 8-4 can accelerate the drying process of the dredged soil paste, the dredged soil paste will rotate and slide down from the left end of the drum 8-4 to the right end of the drum 8-4, changing from a paste state to a dehydrated solid state, and then discharged from the drum 8-4 from the discharge port just below the end of the second bracket 8-7. A dredged soil collection bag 8-8 is prepared below the discharge port for collection. When it is full, the dredged soil collection bag 8-8 can be replaced. Finally, the solidified dredged soil can be transported to a specific storage location for preservation and reuse.

[0087] A working method of a dredged soil separation, consolidation and dehydration integrated device, comprising the following steps:

[0088] First, the cyclone separation module 1 is used to perform preliminary solid-liquid separation on the dredged mud, so that the water content of the separated concentrated slurry is ≤60%; this step uses the cyclone 1-3 separation technology to effectively separate the solid particles and liquid in the dredged mud, greatly reducing the water content in the subsequent processing links, thus laying the foundation for the subsequent processing steps.

[0089] The process parameters of cyclone separation module 1 are as follows:

[0090] Cyclone 1-3: The rotation speed is set at 1500-2500 rpm, and the solid-liquid separation efficiency is ≥90% and the solid recovery rate is ≥85% through centrifugal force;

[0091] Inlet pressure: controlled at 0.3-0.5 MPa to ensure that the mud flow rate is stable at 1.2-1.8 m / s to avoid blockage;

[0092] Separation time: single processing cycle ≤ 3 minutes, unit flow rate can reach 50 ~ 80m 3 / h;

[0093] Number of parallel cyclones 1-3: 3 to 6 groups are configured according to the processing volume requirements, and the processing capacity of each group is matched to avoid overload.

[0094] Then, the separated concentrated slurry is sent to the stirring and consolidation module 5, mixed with the curing agent to make the concentrated slurry quickly consolidated to obtain dredged soil paste, and the moisture content of the dredged soil paste is ≤40%; after the initial separation, the concentrated slurry enters the stirring and consolidation stage. In this stage, the separated solid particles, the small amount of water carried and the added consolidating agent are evenly stirred by professional stirring equipment for further consolidation. This process can not only improve the homogeneity of the material, but also effectively increase its density and stability, preparing for the final processing link.

[0095] The process parameters of stirring and consolidation module 5 are as follows:

[0096] Stirring speed: The speed of the mechanical stirrer 5-1 is 300-500rpm, ensuring that the solid-liquid mixing uniformity is ≥95%;

[0097] Curing agent addition ratio: 8% to 12% of the dry weight of the concentrated slurry (such as the mass ratio of fly ash: slag: sodium silicate = 5:3:2), and the curing reaction time is ≤15 minutes;

[0098] Temperature: The mixing barrel is controlled at 25-35°C to avoid high temperature causing the curing agent to fail;

[0099] Exhaust pressure: Adjust the internal pressure of the mixing tank to normal pressure through the exhaust port 5-3 to prevent gas accumulation.

[0100] Finally, the dredged soil paste obtained after stirring and consolidation is sent to the drum drying module 8 for rotation drying. During drying, the dredged soil paste and the drying gas are conveyed in the opposite direction in the drum 8-4. In this stage, the dredged soil paste is thoroughly dried by rotation drying. The drum 8-4 can quickly evaporate the residual water in the dredged soil paste through continuous rotation and hot air circulation, achieving an ideal drying effect.

[0101] The process parameters of drum drying module 8 are as follows:

[0102] Drum 8-4: the speed is controlled at 5-12 rpm, the inclination angle is 3°-8°, and the material residence time is 20-30 minutes;

[0103] Moisture content at drying end point: ≤15%, meeting the standards for engineering fill or building material recycling.

[0104] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents, and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. An integrated device for separation, consolidation and dehydration of dredged soil, characterized in that: include: Cyclone separation module: used to complete the initial solid-liquid separation of dredged mud under the action of centrifugal force, including a cyclone; Stirring and consolidation module: used to mix and stir the concentrated slurry separated by the cyclone separation module with the curing agent to quickly consolidate the concentrated slurry to obtain dredged soil paste. The stirring and consolidation module is a vertical structure; Drum drying module: used for drying and dehydrating the dredged soil paste, including a rotatable drum, in which the dredged soil paste and the drying gas are conveyed in opposite directions.

2. The dredged soil separation, consolidation and dehydration integrated device according to claim 1, characterized in that: It also includes a spiral transport module, which is used to transport the concentrated slurry separated by the cyclone separation module to the stirring and consolidation module; the spiral transport module includes a tubular shell and a transmission motor, the two ends of the tubular shell are respectively a feed port and a discharge port, a spiral body composed of spiral blades and a spiral shaft is arranged in the tubular shell, and the transmission motor drives the spiral body to rotate, wherein the feed port is connected to the concentrated slurry outlet of the cyclone separation module, and the discharge port is connected to the concentrated slurry inlet of the stirring and consolidation module.

3. The dredged soil separation, consolidation and dehydration integrated device according to claim 1 is characterized in that: It also includes a sedimentation and filtration tank, which is used to collect the clean water and a small amount of sediment separated by the cyclone separation module for sedimentation and filtration before further processing; the bottom of the sedimentation and filtration tank is provided with an A-type lateral oblique flow plate near the water inlet side, and a filter is installed near the water outlet.

4. The dredged soil separation, consolidation and dehydration integrated device according to claim 1, characterized in that: A paste delivery pump is arranged between the stirring and consolidating module and the drum drying module, the inlet of the paste delivery pump is connected to the dredged soil paste outlet of the stirring and consolidating module, and the outlet of the paste delivery pump is connected to the dredged soil paste inlet of the drum drying module.

5. The dredged soil separation, consolidation and dehydration integrated device according to claim 1, characterized in that: The cyclone separation module also includes a solid collection box and a liquid collection box. The thick slurry outlet of the cyclone is connected to the solid collection box, and the liquid outlet is connected to the liquid collection box. The cyclone inlet is connected to the mud conveying pipeline, and the mud conveying pipeline is provided with a valve and a pressure gauge.

6. The dredged soil separation, consolidation and dehydration integrated device according to claim 1, characterized in that: The stirring and consolidation module includes a mechanical stirrer and a stirring barrel body. The motor of the mechanical stirrer is installed on the stirring barrel body. The stirring blades extend into the stirring barrel body. The stirring barrel body is provided with a consolidating agent discharge port, a stirring barrel exhaust port and a concentrated slurry inlet. The bottom of the stirring barrel body is provided with a dredged soil paste outlet.

7. The dredged soil separation, consolidation and dehydration integrated device according to claim 1, characterized in that: The drum drying module also includes a drum driving assembly, an exhaust fan and a dredged soil collecting bag. The drum driving assembly drives the drum to rotate. Both ends of the drum are provided with a drum cover and a bracket, and the bracket is installed under the drum cover; one end of the drum is provided with a dredged soil paste inlet and an exhaust hole, and the other end is provided with a drying gas inlet and a dredged soil outlet; the exhaust fan outlet is connected to the drying gas inlet, and the exhaust fan inlet is connected to the filter barrel; the dredged soil outlet of the drum is connected to the dredged soil collection bag.

8. The dredged soil separation, consolidation and dehydration integrated device according to claim 7, characterized in that: The roller drive assembly includes a drive motor, a drive gear, and a transmission gear. The transmission gear is installed on the roller. The drive motor drives the drive gear to rotate, and the drive gear is meshed with the transmission gear. The roller is placed at an angle, and two bearing supports are arranged under the roller.

9. A working method of the dredged soil separation, consolidation and dehydration integrated device according to any one of claims 1 to 8, characterized in that: The steps include: S1. Use a cyclone separation module to perform preliminary solid-liquid separation on the dredged mud, so that the water content of the separated concentrated slurry is ≤60%; S2, sending the separated concentrated slurry to a stirring and consolidation module, mixing and stirring with a curing agent to rapidly solidify the concentrated slurry to obtain a dredged soil paste, wherein the moisture content of the dredged soil paste is ≤40%; S3, sending the dredged soil paste obtained by stirring and consolidation into the drum drying module for rotational drying. During drying, the conveying directions of the dredged soil paste and the drying gas in the drum are opposite.

10. The working method of the integrated device for separation, consolidation and dehydration of dredged soil according to claim 9, characterized in that: In step S1, the process parameters of the cyclone separation module are as follows: Cyclone: ​​The speed is set at 1500-2500rpm, the solid-liquid separation efficiency is ≥90%, and the solid recovery rate is ≥85%; Inlet pressure: controlled at 0.3-0.5 MPa, ensuring that the mud flow rate is stable at 1.2-1.8 m / s; Separation time: single processing cycle ≤ 3 minutes, unit flow rate can reach 50 ~ 80m 3 / h; In step S2, the process parameters of the stirring and consolidation module are as follows: Stirring speed: The speed of the mechanical stirrer is 300-500 rpm, ensuring that the solid-liquid mixing uniformity is ≥95%; Curing agent addition ratio: 8% to 12% of the dry weight of the concentrated slurry, curing reaction time ≤ 15 minutes; Temperature: The mixing tank is controlled at 25-35°C; Exhaust pressure: adjust the internal pressure of the mixing tank to normal pressure through the exhaust port; In step S3, the process parameters of the drum drying module are as follows: Drum: The speed is controlled at 5-12rpm, the inclination angle is 3°-8°, and the material residence time is 20-30 minutes; Moisture content at drying end point: ≤15%.

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