A dehydration and drying method for river and lake dredged sludge in a transfer process

Abstract

The application discloses a dehydration and drying method in the process of transferring dredged sediment of rivers, lakes and reservoirs, which comprises the following steps: S1, transporting the dredged sediment to the mud barge storage bin; S2, laying the drainage grid in layers in the mud barge storage bin during the process of rising the mud surface elevation; S3, stopping the dredged sediment from being blown to the top of the mud barge, and sealing the top of the storage bin by the sealing film; S4, using the vacuum pump to pump the multi-layer drainage grid, and using the temperature device to increase the temperature while pumping, so that the dredged sediment in the cabin is quickly dehydrated and dried; S5, using the dry excavation method to remove the dredged sediment from the storage bin; and S6, repeating S1-S5 to use the mud barge to process the next batch of dredged sediment. The application dehydrates and dries the dredged sediment in the process of transferring and transporting, effectively improves the efficiency, reduces the cost, greatly shortens the construction period, reduces the construction material cost, and shortens the time consumption in the process of resource utilization of the dredged sediment from the important link.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of river lake dredging sediment treatment, especially relates to a dehydration and drying method and equipment for river lake dredging sediment during transfer. BACKGROUND

[0002] The river lake dredging sediment has the characteristics of high water content, large compressibility, low shear strength, poor permeability and basically no bearing capacity, so it needs to be dehydrated and dried before engineering construction or resource utilization. The common methods can be roughly divided into physical treatment and chemical solidification treatment, including vacuum preloading treatment, heat treatment, pumping and sedimentation drying, mud disposal and chemical solidifying agent treatment, etc. Among them, the vacuum preloading method has the advantages of low cost, simple construction and no pollution, and is the most traditional and most widely used method.

[0003] However, the present inventors have found that the prior art at least has the following technical problems:

[0004] 1. At present, the river lake dredging sediment dehydration and drying construction mostly adopts the ex-situ treatment method. The dredging sediment needs to be excavated from the bottom of the river lake, and then transported to the land dredging sediment treatment site by dry excavation land transportation, waterway transfer or water power transportation. The transfer process consumes a lot of manpower and material resources, and is low in efficiency and high in energy consumption.

[0005] 2. The dredging sediment ex-situ treatment construction process does not meet the current ecological and environmental protection requirements, and a dehydration and drying process and equipment during transportation are needed to greatly reduce the engineering cost and reduce secondary pollution.

[0006] 3. The vacuum preloading treatment in the land mud storage pool takes too long, generally 4-6 months, which is difficult to meet the requirements of many projects.

[0007] 4. A large number of engineering practices show that when the vacuum preloading treatment is carried out in the land mud storage pool, the vacuum degree increases with the increasing distance of the drainage plate, and there is a significant difference in strength of the soil body in deep and wide scales, and the dehydration and drying effect is not good.

[0008] In addition, the prior art also discloses a river silt comprehensive treatment ship with publication number CN105696639B: including a ship body, a power cabin is arranged on the ship body, a vacuum silt treatment cabin and a drainage mechanism are also arranged on the ship body, the drainage mechanism includes a vacuum pump, a horizontal pipe and multiple groups of vertical drainage pipes, the inlet of the vacuum pump is communicated with one end of the horizontal pipe, the multiple groups of vertical drainage pipes are arranged side by side on the horizontal pipe, the top surface of the vacuum silt treatment cabin is provided with through holes for inserting the multiple groups of vertical drainage pipes, and sealing rings are arranged at the connection between the vertical drainage pipes and the through holes. The prior art uses vertical drainage pipes to realize vacuum preloading and improve work efficiency.

[0009] The prior art mainly uses vertically arranged vertical drainage plates for sludge dewatering, generally has a low height of the sludge storage bin, and a short drainage plate, and the vertical drainage plate can only generate a vertical drainage channel, so that the sludge dewatering time is long, the efficiency is low, and it is difficult to make the dredged sludge reach a low water content in a short time during the transfer process; and a large amount of settlement is generated in the sludge storage bin, and the drainage plate is bent during the settlement process, thereby blocking the drainage channel and further reducing the sludge dewatering and solidification effect.

[0010] Therefore, based on the above technical problems, a method for dewatering and drying during the transfer process of dredged sludge is provided based on the conventional vacuum preloading technology, so as to solve the problems of large energy consumption, long time consumption, and easy secondary pollution in land dewatering and drying treatment. The dewatering and drying is performed during the transfer process of dredged sludge, so as to effectively improve the efficiency, reduce the cost, greatly shorten the construction period, and reduce the construction material cost. SUMMARY

[0011] In view of the problems of the prior art, the application provides a dewatering and drying method for the transfer process of river and lake dredged sludge, which effectively improves the efficiency, reduces the cost, greatly shortens the construction period, and reduces the construction material cost.

[0012] The application relates to a dewatering and drying method and equipment for the transfer process of river and lake dredged sludge, and comprises the following steps:

[0013] S1, conveying dredged sludge to a sludge storage bin of a sludge barge:

[0014] Before the dredged sludge is conveyed into the sludge storage bin of the sludge barge, a first layer of drainage grating is pre-laid in the sludge storage bin, the conveying is stopped after the hydraulic filling reaches a set height, then the drainage grating received on the drainage grating receiving device is laid along the length direction of the sludge storage bin, the drainage end of the drainage grating is sealingly connected with a drainage pipe, and the tail end of the drainage grating is sealingly connected with a sealing member.

[0015] S2, layer-by-layer laying of the drainage grating in the sludge storage bin of the sludge barge during the rising of the sludge surface:

[0016] During the hydraulic filling of the dredged sludge into the sludge storage bin of the sludge barge, a plurality of layers of drainage gratings are laid as the sludge surface rises, so as to form a vacuum preloading drainage system; when the sludge surface in the sludge storage bin rises to a set vertical distance of the drainage grating, the drainage grating is repeatedly laid layer by layer according to S1, and the drainage end of each layer of drainage grating is connected with the drainage pipe; during the laying of the drainage grating, the drainage main pipe is used to connect the drainage gratings in each layer.

[0017] S3, stopping the hydraulic filling when the dredged sludge is filled to the top of the sludge barge, and sealing the top of the sludge storage bin by using a sealing film.

[0018] The dredged sludge is stopped from being blown to the top of the barge, a sealing film is laid on the top of the sludge storage bin, and the sealing film is sealed with the top of the sludge storage bin; the edge sealing method is to press the sealing film into the gap between the vertical edge of the sludge storage bin and the dredged sludge for sealing; at the same time, the drainage main pipe is connected with the water vapor separation bottle and the vacuum pump;

[0019] S4, using a vacuum pump to pump air to the multi-layer drainage grid, and using a temperature increaser to increase the temperature during the pumping process to make the dredged sludge in the cabin quickly dewater and dry:

[0020] After the sealing film and the drainage grid are laid, the vacuum pump is used to pump air to the multi-layer drainage grid, which is divided into three stages: pre-pressurization stage, temperature and pressure coupling stage, and pressure relief stage;

[0021] The first stage is the pre-pressurization stage: after all the drainage pipelines are connected, the vacuum pump and the water vapor separator are used to pump air, and the pumping pressure is less than 60kPa. The purpose of this process is to make the drainage grid and the sealing film tightly adhere to the soil;

[0022] The second stage is the temperature and pressure coupling stage: the temperature increaser is used to increase the temperature by being powered on to accelerate the dewatering and consolidation of the dredged sludge in the sludge bin; the temperature increaser is powered on to heat under the condition that the drainage grid and the sealing film are tightly adhered to the soil, the temperature increaser is heated to 70℃, the heat is conducted to the dredged sludge through the heat-conducting shell of the temperature increaser, and the dredged sludge reaches a thermal equilibrium state. Under this state, the dredged sludge has a higher dewatering efficiency than under normal temperature conditions;

[0023] The third stage is the pressure relief stage: stop pumping air, remove the sealing film, and make the air pressure in the sludge bin the same as the atmospheric pressure;

[0024] S5, the dredged sludge is removed from the sludge bin in a dry excavation manner:

[0025] After S4 pumping, the dredged sludge is dewatered and consolidated, the tail water is discharged into the water body after purification, the total drainage pipeline connected to the drainage grid is cut off, and the consolidated dredged sludge is removed from the sludge bin in a dry excavation manner.

[0026] S6, repeat S1-S5 to use the barge to process the next batch of dredged sludge.

[0027] Preferably, S1 can use an environmentally friendly cutter suction dredger to connect a mud blowing pipeline for hydraulic transportation or a water-land excavator bucket to throw fill to the barge sludge storage bin.

[0028] Preferably, the barge is provided with a drainage grid storage device.

[0029] Preferably, the drainage grid storage device comprises a roller for winding the drainage grid, a roller shaft is installed in the roller, and both ends of the roller shaft are installed on a roller shaft support which is fixedly installed on the deck.

[0030] Preferably, the drainage grid is laid simultaneously during the process of raising the mud surface in the S2 mud storage bin, and the vertical spacing between adjacent layers is greater than the width of the drainage grid.

[0031] Preferably, the vertical laying spacing of the drainage grid is greater than 1.2-1.5 m.

[0032] Preferably, the temperature increaser comprises a heat-conducting shell which is installed on the side wall and the bottom of the mud storage bin, and a double-layer graphene electric heating element is installed in the heat-conducting shell.

[0033] Preferably, the temperature increaser is installed on the side wall and the bottom of the mud storage bin in a welded or sealed detachable manner.

[0034] Preferably, the arrangement spacing of the temperature increaser on the side wall of the mud storage bin is 1.5-2.0 m.

[0035] Preferably, the arrangement spacing of the temperature increaser on the bottom of the mud storage bin is 0.8-1.2 m.

[0036] The application has the following advantages and technical effects:

[0037] 1. The dredged sludge is vacuum pre-pressed, dewatered and dried in the mud barge storage bin, without occupying land treatment sites, eliminating the need for facilities such as cofferdams and membrane pressing ditches for building a sludge stacking site, reducing the use area of land stacking sites, reducing construction costs, and reducing secondary pollution.

[0038] 2. The application performs drying treatment on the dredged sludge during transportation, reducing the construction process of dredged sludge transportation and improving the efficiency of dredged sludge drying treatment.

[0039] 3. The drainage grid is arranged in the overall horizontal direction of the mud bin, avoiding the disadvantages of bending of the drainage plate and blocking of the drainage channel caused by settlement of the sludge in the vertical direction; and a multi-directional horizontal drainage channel is established in the horizontal dimension of the dredged sludge, greatly improving the dewatering and consolidation effect of the dredged sludge.

[0040] 4. The traditional land-based mud storage tank vacuum pre-pressing system is greatly improved, with clear structure, clear principle, obvious treatment effect, greatly shortened construction period, simple operation, safe use, and material saving. BRIEF DESCRIPTION OF DRAWINGS

[0041] Figure 1 is a structural schematic diagram of the application;

[0042] Figure 2 is a schematic diagram of the distribution structure of the drainage grid in the storage bin;

[0043] Figure 3 is a schematic diagram of the arrangement structure of the temperature increaser;

[0044] Figure 4 is a schematic diagram of the time curve change of each stage in the dehydration and drying air extraction process.

[0045] Figure 5 is the main flow chart of the method.

[0046] In the figure: 1, ship body; 2, storage bin; 3, drainage grid storage device; 3-1, roller; 3-2, roller shaft; 3-3, roller shaft support; 4, temperature increaser; 4-1, heat-conducting shell; 4-2, heating element; 5, vacuum preloading drainage system; 5-1, drainage grid; 5-2, sealing film; 5-3, drainage main pipe; 5-4, water vapor separation bottle; 5-5, vacuum pump. DETAILED DESCRIPTION

[0047] In order to make the purpose, technical scheme and advantages of the application clearer and more understandable, the application will be further described in detail below in combination with embodiments. It should be understood that the specific embodiments described herein are only used to explain the application and not to limit the application.

[0048] Please refer to Figure 5 The application discloses a dehydration and drying method in the transfer process of river and lake dredged sludge, which comprises the following steps: S1: transporting the dredged slurry to the storage bin of the slurry barge; S2: layering the drainage grid in the storage bin of the slurry barge during the rising of the slurry surface; S3: stopping the dredged slurry from being filled to the top of the slurry barge, and sealing the top of the cabin by the sealing film; S4: using the vacuum pump to extract air from the multi-layer drainage grid, and using the temperature increaser to be powered and heated at the same time, so that the dredged slurry in the cabin is quickly dehydrated and dried; S5: removing the dredged slurry from the cabin by dry excavation; and S6: repeating S1-S5 to use the slurry barge to process the next batch of dredged slurry.

[0049] The method S1 transports the dredged slurry to the storage bin of the slurry barge.

[0050] Before the dredged slurry is transported into the storage bin of the slurry barge, a first layer of drainage grid is laid in the storage bin, the filling is stopped after the filling reaches a set height, then the drainage grid stored in the drainage grid storage device is laid along the length direction of the storage bin, the drainage end of the drainage grid is sealingly connected with the drainage pipe, and the tail end of the drainage grid is sealed by the sealing member.

[0051] Preferably, in the method S1, the dredged dredged sludge is transported to the sludge barge storage bin in the following ways: in the real-time dredging process of the environmental dredging ship, the dredged dredged sludge is transported to the sludge barge storage bin through the mud blowing pipeline connected to the environmental dredging ship; or the sludge barge is parked beside the land dredger, and the dredged sludge in the bucket is directly thrown into the sludge barge after dredging.

[0052] The beneficial aspects of such an arrangement are that the conventional dredging process is to transport the dredged sludge to the sludge barge storage bin, and then to the land storage yard for treatment. Using the present application, the sludge can be treated by dehydration and drying during the transportation process, and the sludge is treated simultaneously during the transportation process, greatly reducing the construction period and improving the efficiency of the sludge dehydration and drying treatment.

[0053] Preferably, in the methods S2-S6, the treatment is carried out in the sludge barge storage bin with a pre-pressing function. The sludge barge has the following characteristics:

[0054] Please refer to Figures 1 to 3 A sludge barge for transferring dredged sludge in rivers, lakes and reservoirs, comprising a sludge storage bin 2 arranged on the hull 1 for storing sludge; a drainage grid storage device 3 is installed on one side edge of the sludge storage bin, which is used to realize the drainage grid storage device 3, and a temperature increaser 4 is installed on the side wall of the sludge storage bin and the bottom of the sludge storage bin; further comprising a vacuum pre-pressing drainage system 5, the vacuum pre-pressing drainage system of the present application is a horizontal drainage system, which solves the problem that the drainage plate in the prior art is relatively short, and the vertical drainage plate can only produce a vertical drainage channel, which results in long sludge dehydration time, low efficiency, and difficulty in completing the drainage purpose in a short time during the transfer process; the vacuum pre-pressing drainage system comprises a drainage grid 5-1 arranged in the sludge storage bin to establish a drainage channel in the transferred sludge, and a sealing film 5-2 arranged on the upper surface of the transferred sludge in the sludge storage bin to establish a closed environment in the sludge storage bin; one end of the drainage grid is connected to a water vapor separation bottle 5-4 through a drainage main pipe 5-3, the air inlet of the water vapor separation bottle is connected to a vacuum pump 5-5, and the water outlet of the water vapor separation bottle 5-4 is directly connected to a drainage pipe for discharging water to a river, lake or filter device for filtering water.

[0055] Preferably, the drainage grid storage device 3 comprises a roller 3-1 for winding the drainage grid, a roller shaft 3-2 is installed in the roller, and the two ends of the roller shaft are installed on a roller shaft support 3-3, and the roller shaft support is fixedly installed on the deck; the above structure can realize the release of the drainage grid, and the drainage grid can be laid layer by layer in the sludge storage bin, greatly reducing the labor intensity; as the drainage grid is a non-reusable component, a certain amount of drainage grid is consumed during each transfer, therefore the roller and the roller shaft are designed as a detachable structure to replace the new drainage grid roll.

[0056] Preferably, the drainage grid storage device 3 is arranged near the driver's cabin side, and the roller is parallel to the short side of the storage bin. The purpose of arranging on the driver's cabin side is not to affect the operation of the two sides of the storage bin or the personnel; at the same time, due to the better stability of the ship body at the stern than at the bow, the driver's cabin is close to the stern, which is beneficial to the operation of the operator.

[0057] Preferably, the drainage grid in the storage bin is provided with N layers, N is greater than or equal to 1, and N is an integer. The beneficial aspect of such arrangement is that when the storage bin is full of mud, there are multiple layers of drainage grids inside, providing multiple-dimensional three-dimensional drainage channels for the dredged sludge in the storage bin, and increasing the dewatering efficiency during air extraction.

[0058] Preferably, the vertical arrangement spacing of the multiple layers of drainage grids is preferably greater than the drainage grid spacing. The beneficial aspect of such arrangement is that during the drainage process of the dredged sludge, due to the high water content of the dredged sludge, a large vertical plastic deformation will occur under its own gravity during the drainage process. A larger upper and lower spacing can reserve space for the deformed drainage grid. If the arrangement spacing of the two layers of drainage grids is too close, the two layers of drainage grids will gather together after the compression of the dredged sludge, resulting in stacking and affecting the drainage efficiency.

[0059] Preferably, the temperature increaser 4 comprises a heat-conducting shell 4-1, which is installed on the side wall and bottom of the storage bin, and a heating element 4-2 is installed in the heat-conducting shell.

[0060] The working principle of the temperature increaser 4 is to increase the temperature of the dredged sludge in the storage bin by electric heating. The beneficial aspect of such arrangement is that the water in the soil near the temperature increaser part is vaporized, the water vapor is conducted to the water vapor separation device (water vapor separation bottle) through the drainage grid, and then the water is discharged from the storage bin, reducing the water content of the soil in the storage bin and achieving the purpose of rapid dewatering and drying. The dredged sludge soil in the storage bin far from the temperature increaser is affected by the heated water vapor, and the overall temperature rises, resulting in an increase in the permeability coefficient of the dredged sludge, which is more easily discharged outside the bin through the drainage channel established by the drainage grid, thereby improving the drainage rate and achieving the purpose of rapid dewatering and drying.

[0061] Preferably, the heating element is a double-layer graphene electric heating element, which has the characteristics of small volume, fast temperature increase, high thermal efficiency, energy saving and environmental protection, and is suitable for stable temperature increase in a small space.

[0062] Preferably, the heat-conducting shell is in a semispherical structure. The beneficial aspect of adopting a semispherical structure is to increase the heat-conducting cross-sectional area and improve the heat conduction efficiency, which is beneficial to the temperature increase of the sludge. The bottom of the shell is a metal plane, which is convenient for connection with the storage bin bulkhead by welding.

[0063] Preferably, the temperature increaser is installed on the side wall and the bottom of the storage bin by welding or detachable connection; the equipment is installed on the ship wall by default, and welding is used; however, the detachable structure can also be used, and the temperature increaser can be detached and replaced independently when the ship is running and the temperature increaser is damaged.

[0064] Preferably, the temperature increaser is installed on the side wall and the bottom of the storage bin by welding.

[0065] Preferably, the arrangement interval of the temperature increaser on the side wall of the storage bin is 1.5-2.0 m.

[0066] Preferably, the arrangement interval of the temperature increaser on the bottom of the storage bin is 0.8-1.2 m.

[0067] The arrangement interval of the temperature increaser on the side wall and the bottom is set as above, and the reason is as follows: the range of high heat conduction efficiency of dredged sludge is 0.5 m, and the heat conduction efficiency of dredged sludge is sharply reduced when the interval between the temperature increaser is more than 0.5 m. In order to ensure the temperature increasing effect of dredged sludge, the interval of the temperature increaser is set as 0.8-1.2 m and 1.5-2.0 m.

[0068] In S2 of the method, the drainage grid is layered and laid on the mud surface in the storage bin of the mud barge during the rising of the mud surface.

[0069] During the process of filling the dredged sludge into the storage bin of the mud barge, multiple layers of drainage grids are laid as the height of the mud surface rises. When the vertical laying interval of the drainage grid is 1.2-1.5 m, the vertical interval is greater than that when the vertical laying interval of the drainage grid is 1 m. Repeat S1 to lay the drainage grid layer by layer, and the drainage end of each layer of the drainage grid is connected to the drainage pipe. During the laying of the drainage grid, the drainage pipe is used to connect the layers of the drainage grid.

[0070] In S3 of the method, the filling of the dredged sludge into the mud barge is stopped when the dredged sludge is filled to the top of the mud barge, and the top of the storage bin is sealed by a sealing film.

[0071] The filling of the dredged sludge into the mud barge is stopped when the dredged sludge is filled to the top of the mud barge, and the top of the storage bin is laid with a sealing film. The sealing film is sealed with the top of the storage bin in the ship by pressing the sealing film into the gap between the vertical edge of the storage bin and the dredged sludge. At the same time, the drainage pipe is connected to the water vapor separation bottle and the vacuum pump.

[0072] In the method S4, a vacuum pump is used to pump air out of the multi-layer drainage grid, and an electric heater is used to increase the temperature while pumping air out, so as to quickly dewater and dry the dredged sludge in the cabin; through vacuum negative pressure and overall temperature increase, the dewatering and drying treatment time of the dredged sludge is further shortened, and the treatment efficiency is improved; after the above technical scheme is adopted, the entire sludge storage bin is sealed by using a surface sealing film, a slurry pump on the ship and a water vapor separation bottle are used to pump air out of the drainage grid, and the soil is heated by the electric heater during the air pumping process; after the dewatering and drying is completed, the surface sealing film is removed, and the excavator is used to transfer the dewatered and dried sludge to the shore sludge storage site;

[0073] Specifically, the following technical scheme is adopted for air pumping and temperature increase, that is, after the sealing film and the drainage grid are laid, a vacuum pump is used to pump air out of the multi-layer drainage grid; the air pumping in the dewatering and drying treatment mainly includes three stages: pre-pressurization stage, temperature and pressure coupling stage, and pressure relief stage; please refer to Figure 4 ;

[0074] The first stage is the pre-pressurization stage: after all the drainage pipelines are connected, a vacuum pump and a water vapor separator are used to pump air out, and the pumping pressure is less than 60kPa; the purpose of this process is to make the drainage grid and the sealing film closely adhere to the soil;

[0075] The second stage is the temperature and pressure coupling stage: an electric heater is used to increase the temperature by electric heating, so as to accelerate the drainage and consolidation of the dredged sludge in the sludge bin; under the condition that the drainage grid and the sealing film closely adhere to the soil, the double-layer graphene electric heating element is heated by electric heating, the electric heater is heated to 70℃, and the heat is conducted to the dredged sludge soil through the heat-conducting shell; the dredged sludge soil reaches a thermal equilibrium state, and the dredged sludge has a higher drainage efficiency in this state than in the normal temperature state;

[0076] The third stage is the pressure relief stage: stop pumping air, remove the sealing film, and make the air pressure in the sludge bin the same as the atmospheric pressure.

[0077] In the method S5, the dredged sludge is removed from the sludge storage bin by dry excavation:

[0078] After a period of air pumping, the dredged sludge is drained and consolidated, the tail water is discharged into the water body after purification, the total drainage pipeline connected to the drainage grid is cut off, and the dredged sludge is removed from the sludge storage bin by dry excavation.

[0079] Preferably, in the method S5, the dredged sludge is removed by using an excavator; the method is used to treat high-moisture dredged sludge, and the moisture content of the sludge is greatly reduced after treatment, which provides convenience for further resource utilization. During the removal process, the drainage grid, the sealing film and the like in the sludge storage bin are also excavated.

[0080] In the method S6, S1-S5 are repeated; the next batch of dredged sludge is treated by using a sludge barge.

[0081] Further, the drainage grid is used once, and the temperature increaser 4 can be used repeatedly in the dredged sludge transfer process.

[0082] The above technical scheme is used for dehydration and drying in the dredged sludge transfer process, reduces the land yard use area, avoids secondary pollution, synchronously applies vacuum negative pressure and temperature increase, improves the drainage and consolidation rate and effect of the dredged sludge, and shortens the time consumption in the process of resource utilization of the dredged sludge in important links.

[0083] The above only describes the preferred embodiments of the application and is not intended to limit the application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the application, the resistance type heat coil temperature increaser, and the arrangement of the temperature increaser, which is not exposed and can be buried in the bottom and side wall of the cabin, should be included in the protection scope of the application.

Claims

1. A method for dewatering and drying dredged sediment during transfer in a river, lake or reservoir, comprising the following steps: S1. Transporting dredged sediment to a storage bin of a barge; Before transporting the dredged sediment into the storage bin of the barge, a first layer of drainage grid is laid in the storage bin. When the filling reaches a certain height, the transportation is stopped, and then the drainage grid stored on the drainage grid storage device is laid along the length direction of the storage bin. The drainage end of the drainage grid is sealingly connected to a drainage pipe, and the end of the drainage grid is sealed with a sealing member. The drainage grid storage device comprises a roller for winding the drainage grid, a roller shaft is installed in the roller, and the two ends of the roller shaft are installed on a roller shaft support which is fixedly installed on the deck; S2. Laying drainage grids in layers during the rising of the sediment surface in the storage bin of the barge; During the process of filling the dredged sediment into the storage bin of the barge, multiple layers of drainage grids are laid as the height of the sediment surface rises, forming a vacuum preloading drainage system. As the height of the sediment surface in the storage bin increases, when the vertical distance between the drainage grids reaches the set distance, repeat S1 to lay the drainage grids in layers. The drainage end of each layer of drainage grid is connected to a drainage pipe. During the laying of the drainage grids, the main drainage pipe is used to connect the drainage grids in each layer simultaneously; S3. Stopping filling when the dredged sediment reaches the top of the barge, and sealing the top of the storage bin with a sealing film; When the dredged sediment reaches the top of the barge, the filling is stopped, and a sealing film is laid on the top of the storage bin to seal the top of the storage bin. The edge sealing method is to press the sealing film into the gap between the vertical edge of the storage bin and the dredged sediment for sealing. At the same time, the main drainage pipe is connected to a water vapor separator and a vacuum pump; S4. Using a vacuum pump to pump air out of the multiple layers of drainage grids, and using a temperature increaser to increase the temperature during the pumping process to make the dredged sediment in the cabin dehydrate and dry quickly; After the sealing film and the drainage grids are laid, the vacuum pump is used to pump air out of the multiple layers of drainage grids, which is divided into three stages: pre-pressurization stage, temperature and pressure coupling stage, and pressure relief stage; The first stage is the pre-pressurization stage: after all the drainage pipelines are connected, the vacuum pump and the water vapor separator are used to pump air, and the pumping pressure is less than 60kPa. The purpose of this process is to make the drainage grids and the sealing film tightly adhere to the soil; The second stage is the temperature and pressure coupling stage: the temperature increaser is used to increase the temperature to accelerate the drainage and consolidation of the dredged sediment in the storage bin. The temperature increaser is heated to 70℃, and the heat is conducted to the dredged sediment through the heat-conducting shell of the temperature increaser. The dredged sediment reaches a state of thermal equilibrium, and the dredged sediment has a higher drainage efficiency in this state compared to the normal temperature state; The third stage is the pressure relief stage: stop pumping, remove the sealing film, and make the air pressure in the storage bin equal to the atmospheric pressure; The temperature increaser comprises a heat-conducting shell, which is installed on the side wall and the bottom of the storage bin, and a double-layer graphene electric heating element is installed in the heat-conducting shell; The arrangement distance of the temperature increaser on the side wall of the storage bin is 1.5-2.0m; The arrangement interval of the temperature increaser at the bottom of the storage bin is 0.8-1.2 m; S5, the dredged sediment is removed from the storage bin in a dry excavation manner; After the air extraction in S4, the dredged sediment is drained and consolidated, the tail water is discharged into the water body after purification, the total drainage pipeline connected with the drainage grid is cut off, and the consolidated dredged sediment is removed from the storage bin in a dry excavation manner; S6, S1-S5 are repeated, and the next batch of dredged sediment is treated by using the barge.

2. The method for dewatering and drying of the river, lake and reservoir dredged sludge during the transfer process according to claim 1, characterized in that: In S1, the environmental protection cutter suction dredger is connected with the mud blowing pipeline for hydraulic transportation or the amphibious excavator bucket for throwing and filling to be transported to the barge storage bin.

3. The method for dewatering and drying of the river, lake and reservoir dredged sludge during the transfer process according to claim 1, characterized in that: In S2, the drainage grid is laid simultaneously during the rising of the mud surface in the storage bin, and the vertical interval between adjacent layers is greater than the width of the drainage grid.

4. The method for dewatering and drying of the river, lake and reservoir dredged sludge during the transfer process according to claim 3, characterized in that: The vertical laying interval of the drainage grid is greater than 1.2 m.

5. The method for dewatering and drying of the river, lake and reservoir dredged sludge during the transfer process according to claim 3, characterized in that: The vertical laying interval of the drainage grid is greater than 1.5 m.

6. The method for dewatering and drying of the river, lake and reservoir dredged sludge during the transfer process according to claim 4, characterized by the fact that: The temperature increaser is installed on the side wall and the bottom of the storage bin in a welded or sealed detachable connection manner.

Images