A dredging pipeline variable inflow direction aeration device and use method

Abstract

The present invention relates to a variable inflow direction aeration device for dredging pipelines, comprising a clean water delivery component, an air delivery component and an aeration angle jet component; the device can integrate two aeration modes into one by adjusting different valve switches, directly complete the conversion of the two aeration modes, and adjust different aeration amounts, water-gas jet ratios, etc. The appropriate aeration angle can form an air film between the mud and the pipe wall, effectively reduce friction and collision, reduce flow resistance, thereby extending the service life of the pipeline and reducing the total energy consumption of the system. In addition, the appropriate aeration angle can also ensure that the bubbles are evenly distributed in the pipeline, maintain a stable flow field structure, prevent sediment particles from accumulating at the bends or reverse slopes of the pipeline, and reduce the risk of blockage. The purpose of the present invention is to overcome the existing defects and provide a variable inflow direction aeration device for dredging pipelines and a method of use, significantly reduce energy consumption, and improve the reliability and efficiency of transportation.

Description

Technical Field

[0001] The invention relates to a dredging pipeline variable inflow direction aeration device and a use method thereof. Background Art

[0002] Pipeline transportation of dredged mud is a technology that uses water as a carrier to transport solid particles such as silt, gravel and pebbles in a pipeline. Due to its low pollution, continuous operation and strong transportation capacity, it has been widely used in fields such as channel dredging, submarine trenching and sewage treatment. However, in dredging operations, solid particles such as silt, gravel and pebbles need to be transported from the dredging point to the designated deposition area through a pipeline. However, due to the high viscosity of the mud, solid particles are easily deposited in the pipeline, especially in the reverse slope and curved sections. This deposition will not only increase the friction and collision inside the pipeline, resulting in energy loss, but also aggravate the wear of the pipeline, shorten its service life, and even cause system blockage, forcing the project to shut down for maintenance and cleaning, greatly reducing the efficiency of the project and increasing costs.

[0003] In order to cope with engineering problems such as high energy consumption, pipeline blockage and pipeline erosion, researchers at home and abroad have been exploring solutions. In actual engineering, a relay pump station is usually set up in the middle of the mud pipeline to increase external energy to overcome the resistance loss of the mud. However, this power-assisting method often brings new problems such as complex equipment, difficult installation and inconvenient operation. In addition, although replacing new pipes can solve the problem of pipeline erosion, it cannot fundamentally reduce pipeline wear, resulting in high costs and low efficiency.

[0004] Therefore, in order to solve the above problems, a dredging pipeline variable inflow direction aeration device and a use method are proposed. Summary of the invention

[0005] The purpose of the present invention is to overcome the existing defects and provide a dredging pipeline variable inflow direction aeration device and a use method, which significantly reduces energy consumption and improves the reliability and efficiency of transportation.

[0006] The technical solution to achieve the above-mentioned purpose is: a dredging pipeline variable inflow direction aeration device, including a clean water conveying component, an air conveying component and an aeration angle jet component; one end of the clean water conveying component is connected to a mud discharge pipe, and the other end is connected to the aeration angle jet component, and the aeration angle jet component is arranged in the mud discharge pipe; the air conveying component is arranged on one side of the mud discharge pipe and connected to the aeration angle jet component.

[0007] Preferably, the clean water delivery assembly includes a water intake pipe, one end of which is connected to the mud discharge pipe, and the other end is connected to the inlet end of the centrifugal pump, the outlet end of the centrifugal pump is connected to the water delivery pipeline, and the other end of the water delivery pipeline is connected to the aerated angle jet assembly;

[0008] The water delivery pipeline is provided with a water pressure gauge and a water cock.

[0009] Preferably, the air delivery assembly comprises an air compressor, the output end of the air compressor is connected to the gas main pipe, the other end of the gas main pipe is respectively connected to three porous medium pipes, the other ends of the three porous medium pipes are respectively connected to a gas branch pipe, and the other ends of the three gas branch pipes are connected to the water pipeline;

[0010] Each of the gas transmission branches is connected to a branch pipe ball valve;

[0011] The gas transmission main pipe is connected to a gas meter and a constant pressure regulating valve group;

[0012] The lower ends of the water pipeline and the gas main pipe are both connected with adjustment brackets.

[0013] Preferably, the air delivery assembly further comprises two large-volume air supply branch pipes, one end of the two large-volume air supply branch pipes is connected to the gas supply main pipe, and the other end is connected to the mud discharge pipe;

[0014] A plurality of mud discharge pipe air release valves are arranged at equal intervals on the mud discharge pipe.

[0015] Preferably, the air injection angle jet assembly comprises an eccentric wheel disc and an air blowing pipe, one end of the air blowing pipe is connected to the eccentric wheel disc, and the other end extends into the mud discharge pipe and is connected to a variable inflow nozzle; the outer wall of the air blowing pipe is rotatably connected to a turntable connecting flange, and the turntable connecting flange is connected to the outer wall of the mud discharge pipe;

[0016] The eccentric wheel disc is rotatably connected to a water delivery pipeline via a rotating bearing, so that the water delivery pipeline is connected to the air blowing pipeline;

[0017] The edge of the surface of the eccentric wheel disc is connected to the eccentric connecting shaft, the eccentric connecting shaft is rotatably connected to the first connecting rod, the other end of the first connecting rod is rotatably connected to the second connecting rod, the other end of the second connecting rod is fixedly connected to one end of the rotating shaft, and the other end of the rotating shaft is connected to the output end of the driving motor; the driving motor is connected to the driving motor base.

[0018] A method for using a dredging pipeline variable inflow direction aeration device, comprising:

[0019] Step 1: Start the air compressor, close the water plug valve and centrifugal pump on the water pipeline, and spray out from the variable inflow nozzle to add a large amount of air;

[0020] Step 2: Start the air compressor and open the water valve and centrifugal pump on the water pipeline to perform jet aeration;

[0021] Step 3, by starting the air compressor, cooperating with closing the water cock valve and the centrifugal pump on the water delivery pipeline, spraying out from the large volume gas filling branch pipe to perform large volume gas filling; and

[0022] Step 4: Set the air compressor to a constant pressure, change the air volume in the dredging pipeline by changing the size of the variable inlet nozzle, and perform constant pressure air filling.

[0023] Preferably, the step 1 is performed as follows:

[0024] Close the stopcock water valve and centrifugal pump on the water pipeline, start the air compressor, and the air from the air compressor will generate high-pressure air that goes along the gas pipeline through three gas branch pipes, the water pipeline, the air blowing pipeline, and then is ejected from the variable inflow nozzle to perform air-injection and drag-reducing transportation on the mud discharge pipe.

[0025] Preferably, the step 2 is performed as follows:

[0026] Open the water valve and centrifugal pump on the water pipeline, start the air compressor, and the high-pressure air generated in the air compressor meets the high-pressure water flow generated by the centrifugal pump on the water pipeline to form a water-gas mixture, which passes through the air blowing pipeline and is ejected from the variable inflow nozzle together with the mud; reduce the resistance of the mud discharge pipe;

[0027] The three porous medium tubes with different pore sizes generate microbubbles of different sizes after mixing with the high-pressure water flow in the water supply pipeline. The branch pipe ball valve can also be used to control the desired bubble size. To change the aeration angle, the drive motor is started to drive the connected shaft to rotate. The rotation of the shaft drives the first connecting rod and the second connecting rod to swing together, driving the eccentric wheel to rotate. The rotation of the eccentric wheel drives the blowing pipe and the variable inflow nozzle to rotate, thereby changing the angle at which the gas or water-gas mixture is injected into the mud discharge pipe. When there is too much gas in the mud discharge pipe, some of the gas added to the mud discharge pipe is released by opening the mud discharge pipe bleed valve above each mud discharge pipe at a certain distance.

[0028] Preferably, the step three is performed as follows:

[0029] Close the water valve and centrifugal pump on the water pipeline, start the air compressor, and the air from the air compressor will generate high-pressure air which will go along the gas pipeline from the large volume gas filling branch pipe into the mud discharge pipe for gas filling and drag reduction transportation.

[0030] Preferably, the step 4 is performed as follows:

[0031] Set the air compressor to a constant pressure, change the air volume of the dredging pipeline by changing the size of the variable inflow nozzle, and control the air volume of the dredging pipeline between 3% and 5% through the gas meter and the constant pressure regulating valve group;

[0032] According to the critical velocity calculation formula of the Technical Specification for Dredging and Filling Engineering (JTS207-2012):

[0033] Silt, clay with an average particle size less than 0.05 mm and silt:

[0034]

[0035] The sandy soil with an average particle size greater than 0.05 mm should be calculated according to the formula:

[0036]

[0037] Where: vc——critical velocity of mud (m / s);

[0038] C——volume concentration of soil particles (%);

[0039] D——Inner diameter of pipeline (m);

[0040] vss – the settling velocity of particles in still water (m / s);

[0041] ds——average particle size of sand particles (m);

[0042] g——acceleration due to gravity (m / s2);

[0043] Practical flow rate (economic flow rate) calculation formula:

[0044] v p =K v v c

[0045] Where: vp——minimum practical flow velocity (m / s);

[0046] vc——critical velocity (m / s), calculated according to the average concentration of transported mud;

[0047] Kv——coefficient.

[0048] When the flow velocity v in the pipeline is less than vc, the slurry in the pipeline is moving. At this time, the driving motor drives the connected shaft to rotate, and the rotation of the shaft drives the first connecting rod and the second connecting rod to swing together, driving the eccentric wheel to rotate. The rotation of the eccentric wheel drives the blowing pipeline and the variable inflow nozzle to rotate, and the aeration inflow direction is adjusted to be perpendicular to the pipeline direction, that is, θ=90°; the purpose is to disturb the sediment layer at the bottom of the dredged pipeline, so that it is suspended to reduce the transportation resistance;

[0049] When vc<v<vp, the driving motor is controlled to drive the connected shaft to rotate, and the rotation of the shaft drives the first connecting rod and the second connecting rod to swing together, driving the eccentric wheel to rotate, and the rotation of the eccentric wheel drives the blowing pipe and the variable inflow nozzle to rotate, adjusting the gas inflow direction between 0° and 90°, that is,

[0050]

[0051] When the flow velocity v in the pipeline is greater than vc, the connected shaft is driven to rotate by the driving motor, and the rotation of the shaft drives the first connecting rod and the second connecting rod to swing together, driving the eccentric wheel to rotate, and the rotation of the eccentric wheel drives the blowing pipeline and the variable inflow nozzle to rotate, and adjust the aeration inflow direction to be parallel to the pipeline direction, that is, θ=0°; in this conveying state, aeration makes the slurry fully mixed and changes the internal structure of the slurry to achieve the drag reduction effect.

[0052] The beneficial effects of the present invention are: the dredging pipeline variable inflow direction aeration device and use method improve some shortcomings of the existing dredging pipeline aeration devices, which are already few in number. Compared with the two traditional dredging pipeline aeration methods of large volume aeration and jet aeration, the present device can integrate the two aeration methods into one by adjusting different valve switches, directly complete the conversion of the two aeration methods, and adjust different aeration volumes, water-gas jet ratios, etc.

[0053] The appropriate aeration angle can form an air film between the mud and the pipe wall, effectively reducing friction and collision, and reducing flow resistance, thereby extending the service life of the pipeline and reducing the total energy consumption of the system. In addition, the appropriate aeration angle can ensure that the bubbles are evenly distributed in the pipeline, maintain a stable flow field structure, prevent sediment particles from accumulating at the bends or reverse slopes of the pipeline, and reduce the risk of blockage. This device can easily adjust the aeration angle. By adjusting the aeration angle, the distribution of bubbles in the pipeline can be changed, thereby affecting the flow characteristics and drag reduction effect of the gas-liquid mixture. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] Figure 1 It is an axonometric diagram of the variable inflow direction aeration device for dredging pipelines of the present invention;

[0055] Figure 2 It is another perspective axonometric diagram of the variable inflow direction aeration device for dredging pipelines of the present invention;

[0056] Figure 3 It is a front view of the dredging pipeline variable inflow direction aeration device of the present invention;

[0057] Figure 4 It is a top view of the variable inflow direction aeration device for dredging pipelines of the present invention;

[0058] Figure 5 It is a right side view of the variable inflow direction aeration device for dredging pipelines of the present invention;

[0059] Figure 6 It is a left side view of the dredging pipeline variable inflow direction aeration device of the present invention;

[0060] Figure 7 It is a detailed view of the aerated angle jet assembly of the present invention.

[0061] In the figure: 1, water intake pipe; 2, centrifugal pump; 3, water pipeline; 4, water pressure gauge; 5, water cock; 6, air compressor; 7, gas main pipe; 8, gas meter and constant pressure regulating valve group; 9, adjusting bracket; 10, large volume gas supply branch pipe; 11, porous medium pipe; 12, gas branch pipe; 13, branch pipe ball valve; 14, drive motor base; 15, drive motor; 17, variable inflow nozzle; 18, mud discharge pipe; 19, mud discharge pipe air release valve; 171, eccentric wheel disc; 172, air blowing pipe; 173, turntable connecting flange; 174, rotating bearing; 175, eccentric connecting shaft; 176, first connecting rod; 177, second connecting rod; 178, rotating shaft. DETAILED DESCRIPTION

[0062] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply 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. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0063] The present invention will be further described below in conjunction with the accompanying drawings.

[0064] At present, direct aeration and jet aeration are mainly used for aeration of dredging pipelines. The existing technology mainly involves drilling holes in the pipeline to add gas. This aeration method is relatively simple, difficult to control, and has low efficiency.

[0065] like Figure 1-7 As shown, a dredging pipeline variable inflow direction aeration device includes a clean water conveying component, an air conveying component and an aeration angle jet component; one end of the clean water conveying component is connected to the mud discharge pipe 18, and the other end is connected to the aeration angle jet component, and the aeration angle jet component is arranged in the mud discharge pipe 18; the air conveying component is arranged on one side of the mud discharge pipe 18 and is connected to the aeration angle jet component.

[0066] Specifically, the clean water delivery assembly includes a water intake pipe 1, one end of which is connected to the mud discharge pipe 18, and the other end is connected to the inlet end of the centrifugal pump 2. The outlet end of the centrifugal pump 2 is connected to the water delivery pipe 3, and the other end of the water delivery pipe 3 is connected to the aerated angle jet assembly; a water pressure gauge 4 and a plug valve 5 are provided on the water delivery pipe 3. The water pressure gauge 4 monitors the pressure state of the water in the pipe in real time, and the plug valve 5 can adjust the flow rate of water delivery.

[0067] Specifically, the aerated jet water is directly drawn from the mud discharge pipe 18, and the water intake pipe 1 is in the middle of the pipeline and downstream of the conveying direction; it is at a certain angle to the pipeline. This can reduce the number of parts of the device, and is energy-saving and environmentally friendly. There is pressure in the dredging pipeline when it is conveyed, so the water intake can use this part of the pressure in the pipeline; the middle part is to take the clean water part in the pipeline, and the certain angle is to prevent large particles of dredged materials from blocking the pipeline.

[0068] The device directly draws water from the middle of the dredging pipeline by tilting the pipeline, which can not only utilize the original pressure of the pipeline energy, but also reduce the components of the device, thus saving energy and labor.

[0069] Specifically, the air delivery assembly includes an air compressor 6, the output end of the air compressor 6 is connected to the gas main pipe 7, the other end of the gas main pipe 7 is respectively connected to three porous medium pipes 11, the other ends of the three porous medium pipes 11 are respectively connected to a gas branch pipe 12, and the other ends of the three gas branch pipes 12 are connected to the water pipeline 3; each gas branch pipe 12 is connected to a branch pipe ball valve 13; the gas main pipe 7 is connected to a gas meter and a constant pressure regulating valve group 8. The lower ends of the water pipeline 3 and the gas main pipe 7 are connected to an adjusting bracket 9.

[0070] like Figure 5 As shown, the porous medium tube 11 is used to disperse the compressed air into a plurality of microbubbles, which can form a gas-liquid jet mixture with the clean water from the water storage tank. The aperture size is different, so the bubble diameter in the jet formed will also be different. By controlling the air supply through the branch pipe ball valve 13 on each branch pipe, bubbles with different graded particle diameters can be obtained to test which one is more conducive to dredging pipeline transportation.

[0071] Specifically, this technology introduces microbubbles into the slurry to change the rheological properties of the mud, reduce the viscosity and density of the mud, and thus reduce the friction and collision between the sediment particles and the pipe wall. The introduction of such microbubbles can destroy the flocculation network structure in the mud, greatly enhance the fluidity of the mud, thereby increasing the flow rate of the fluid in the pipeline and reducing energy loss. In addition, by setting up an axial jet device, a high-speed jet is formed at the pipe connection, which can not only directly impact the deposited particles near the pipe wall and prevent sediment from accumulating and clogging at key locations, but also evenly distribute the gas-liquid mixture, making the flow field of the entire system more stable.

[0072] Specifically, this aerated transportation method that combines microbubble technology and jet technology not only effectively overcomes the blockage and wear problems in traditional mud transportation, but also significantly reduces energy consumption and improves the reliability and efficiency of transportation. In practical applications, this technology has been verified and promoted in the fields of channel dredging, seabed trenching, sewage treatment, etc. It provides an efficient and low-cost solution for the transportation of long-distance, high-viscosity mud, greatly promoting the development of dredging engineering technology.

[0073] Specifically, the air delivery component also includes two large-volume air supply branch pipes 10 , one end of the two large-volume air supply branch pipes 10 is connected to the gas supply main pipe 7 , and the other end is connected to the mud discharge pipe 18 .

[0074] like Figure 4 As shown, the aerated angle jet assembly includes an eccentric wheel disc 171 and a blowing pipe 172, one end of the blowing pipe 172 is connected to the eccentric wheel disc 171, and the other end extends into the mud discharge pipe 18 and is connected to the variable inflow nozzle 17; the outer wall of the blowing pipe 172 is rotatably connected to the turntable connecting flange 173, and the turntable connecting flange 173 is connected to the outer wall of the mud discharge pipe 18; the eccentric wheel disc 171 is rotatably connected to the water supply pipe 3 through the rotating bearing 174, so that the water supply pipe 3 is connected to the blowing pipe 172.

[0075] Specifically, the surface edge of the eccentric wheel disc 171 is connected to the eccentric connecting shaft 175, the eccentric connecting shaft 175 is rotatably connected to the first connecting rod 176, the other end of the first connecting rod 176 is rotatably connected to the second connecting rod 177, the other end of the second connecting rod 177 is fixedly connected to one end of the rotating shaft 178, and the other end of the rotating shaft 178 is connected to the output end of the driving motor 15; the driving motor 15 is connected to the driving motor base 14.

[0076] Specifically, a plurality of mud discharge pipe air release valves 19 are arranged at equal intervals on the mud discharge pipe 18 .

[0077] Specifically, the specific principle is that the driving motor 15 drives the rotating shaft 178 connected thereto to rotate, the rotating shaft 178 rotates to drive the second connecting rod 177 to swing, the second connecting rod 177 swings to drive the first connecting rod 176 to swing, the first connecting rod 176 swings to push the eccentric connecting shaft 175, so that the eccentric wheel disc 171 rotates, and the rotation of the eccentric wheel disc 171 can drive the connected variable inflow nozzle 17 to rotate, thereby achieving the change of the gas filling angle. In addition, in order to prevent the turntable from rotating in one direction all the time, the connecting rod will collide and entangle with the water and gas transmission pipeline, so the program is set so that the driving motor does not rotate in one direction, but is set to rotate back and forth for a certain number of circles, so as to protect the equipment while not affecting the rotation of the jet nozzle within a certain angle range.

[0078] A method for using a dredging pipeline variable inflow direction aeration device, comprising:

[0079] Step 1, large volume gas filling mode 1;

[0080] The operation of large volume filling mode 1 is as follows:

[0081] Close the stopcock water valve 5 and the centrifugal pump 2 on the water pipeline 3, start the air compressor 6, and the air from the air compressor 6 generates high-pressure air. The air goes along the gas pipeline 7 through the three gas branch pipes 12, the water pipeline 3, the air blowing pipeline 172, and then is ejected from the variable inflow nozzle 17 to perform air-injection and drag-reducing transportation work on the mud discharge pipe 18.

[0082] Step 2, jet aeration mode;

[0083] The jet aeration mode operates as follows:

[0084] Open the water cock 5 and the centrifugal pump 2 on the water pipeline 3, start the air compressor 6, and the high-pressure air generated in the air compressor 6 meets the high-pressure water flow generated by the centrifugal pump 2 on the water pipeline 3 to form a water-gas mixture, which passes through the air blowing pipeline 172 and is ejected from the variable inflow nozzle 17 and transported together with the mud; perform drag reduction and transportation work on the mud discharge pipe 18;

[0085] The three porous medium tubes 11 with different pore sizes generate microbubbles of different sizes after mixing with the high-pressure water flow in the water supply pipe 3. The branch pipe ball valve 13 can also be used to control the desired bubble size to be generated; change the aeration angle, start the drive motor 14 to drive the connected rotating shaft 178 to rotate, the rotation of the rotating shaft 178 drives the first connecting rod 176 and the second connecting rod 177 to swing together, drive the eccentric wheel 171 to rotate, the rotation of the eccentric wheel 171 drives the blowing pipe 172 and the variable inflow nozzle 17 to rotate, thereby changing the angle at which the gas or water-gas mixture is injected into the mud discharge pipe 18; when there is too much gas in the mud discharge pipe 18, some of the gas added to the mud discharge pipe is released by opening the mud discharge pipe 19 above the mud discharge pipe 18 at a certain distance.

[0086] Step 3, large volume gas filling mode 2;

[0087] The operation of large volume gas filling mode 2 is as follows:

[0088] Close the water valve 5 and the centrifugal pump 2 on the water pipeline 3, start the air compressor 6, and the air from the air compressor 6 generates high-pressure air along the air pipeline 7 from the large-volume air-filling branch pipe 10 into the mud discharge pipe 18 for air-filling and drag-reducing transportation.

[0089] Step 4: Constant pressure mode.

[0090] Constant pressure mode operates as follows:

[0091] The air compressor 6 is set to a constant pressure, and the air supply amount of the dredging pipeline is changed by changing the size of the variable inflow nozzle 17, and the air supply amount of the dredging pipeline can be controlled between 3% and 5% through the gas meter and the constant pressure regulating valve group 8;

[0092] According to the critical velocity calculation formula of the Technical Specification for Dredging and Filling Engineering (JTS207-2012):

[0093] Silt, clay with an average particle size less than 0.05 mm and silt:

[0094]

[0095] The sandy soil with an average particle size greater than 0.05 mm should be calculated according to the formula:

[0096]

[0097] Where: vc——critical velocity of mud (m / s);

[0098] C——volume concentration of soil particles (%);

[0099] D——Inner diameter of pipeline (m);

[0100] vss – the settling velocity of particles in still water (m / s);

[0101] ds——average particle size of sand particles (m);

[0102] g——acceleration due to gravity (m / s2);

[0103] Practical flow rate (economic flow rate) calculation formula:

[0104] v p =K v v c

[0105] Where: vp——minimum practical flow velocity (m / s);

[0106] vc——critical velocity (m / s), calculated according to the average concentration of transported mud;

[0107] Kv——coefficient.

[0108] Practical flow rate coefficient table

[0109]

[0110] When the flow velocity v in the pipeline is less than vc, the slurry part in the pipeline is moving. At this time, the connected rotating shaft 178 is driven to rotate by the driving motor 14. The rotation of the rotating shaft 178 drives the first connecting rod 176 and the second connecting rod 177 to swing together, driving the eccentric wheel 171 to rotate. The rotation of the eccentric wheel 171 drives the blowing pipe 172 and the variable inflow nozzle 17 to rotate, and the aeration inflow direction is adjusted to be perpendicular to the pipeline direction, that is, θ=90°; the purpose is to disturb the sediment layer at the bottom of the dredged pipeline, so that it is suspended to reduce the transportation resistance;

[0111] When vc<v<vp, the driving motor 14 is controlled to drive the connected rotating shaft 178 to rotate, and the rotation of the rotating shaft 178 drives the first connecting rod 176 and the second connecting rod 177 to swing together, driving the eccentric wheel 171 to rotate, and the rotation of the eccentric wheel 171 drives the blowing pipe 172 and the variable inflow nozzle 17 to rotate, adjusting the gas inflow direction between 0° and 90°, that is,

[0112]

[0113] When the flow velocity v in the pipeline is greater than vc, the connected rotating shaft 178 is driven to rotate by the driving motor 14, and the rotation of the rotating shaft 178 drives the first connecting rod 176 and the second connecting rod 177 to swing together, driving the eccentric wheel 171 to rotate, and the rotation of the eccentric wheel 171 drives the blowing pipeline 172 and the variable inflow nozzle 17 to rotate, and adjust the aeration inflow direction to be parallel to the pipeline direction, that is, θ=0°; in this conveying state, aeration makes the slurry fully mixed and changes the internal structure of the slurry to achieve the drag reduction effect.

[0114] The dredging pipeline variable inflow direction aeration device and use method improve some shortcomings of the existing dredging pipeline aeration devices, which are already few in number. Compared with the two traditional dredging pipeline aeration methods of large volume aeration and jet aeration, the device can integrate the two aeration methods into one by adjusting different valve switches, directly complete the conversion of the two aeration methods, and adjust different aeration volumes, water-gas jet ratios, etc.

[0115] The appropriate aeration angle can form an air film between the mud and the pipe wall, effectively reducing friction and collision, and reducing flow resistance, thereby extending the service life of the pipeline and reducing the total energy consumption of the system. In addition, the appropriate aeration angle can ensure that the bubbles are evenly distributed in the pipeline, maintain a stable flow field structure, prevent sediment particles from accumulating at the bends or reverse slopes of the pipeline, and reduce the risk of blockage. This device can easily adjust the aeration angle. By adjusting the aeration angle, the distribution of bubbles in the pipeline can be changed, thereby affecting the flow characteristics and drag reduction effect of the gas-liquid mixture.

[0116] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that the technical solutions described in the above embodiments may still be modified, or some or all of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A dredging pipeline variable inflow direction aeration device, characterized in that: It comprises a clean water conveying component, an air conveying component and an aerated angle jet component; one end of the clean water conveying component is connected to a mud discharge pipe (18), and the other end is connected to the aerated angle jet component, and the aerated angle jet component is arranged in the mud discharge pipe (18); the air conveying component is arranged on one side of the mud discharge pipe (18) and is connected to the aerated angle jet component.

2. The variable inflow direction aeration device for dredging pipelines according to claim 1 is characterized in that: The clean water delivery assembly comprises a water intake pipe (1), one end of the water intake pipe (1) is connected to the mud discharge pipe (18), and the other end is connected to the inlet end of the centrifugal pump (2), the outlet end of the centrifugal pump (2) is connected to the water delivery pipe (3), and the other end of the water delivery pipe (3) is connected to the aerated angle jet assembly; The water delivery pipeline (3) is provided with a water pressure gauge (4) and a water cock (5).

3. The variable inflow direction aeration device for dredging pipelines according to claim 2 is characterized in that: The air delivery assembly comprises an air compressor (6), the output end of the air compressor (6) is connected to a gas main pipe (7), the other end of the gas main pipe (7) is respectively connected to three porous medium pipes (11), the other ends of the three porous medium pipes (11) are respectively connected to a gas branch pipe (12), and the other ends of the three gas branch pipes (12) are connected to the water pipeline (3); Each of the gas transmission branch pipes (12) is connected to a branch pipe ball valve (13); The gas transmission main pipe (7) is connected to a gas meter and a constant pressure regulating valve group (8); The lower ends of the water delivery pipeline (3) and the gas delivery main pipe (7) are both connected to an adjustment bracket (9).

4. The variable inflow direction aeration device for dredging pipelines according to claim 3 is characterized in that: The air delivery assembly further comprises two large-volume air supply branch pipes (10), one end of the two large-volume air supply branch pipes (10) is connected to the gas supply main pipe (7), and the other end is connected to the mud discharge pipe (18); A plurality of mud discharge pipe air release valves (19) are arranged at equal intervals on the mud discharge pipe (18).

5. The variable inflow direction aeration device for dredging pipelines according to claim 2, characterized in that: The air injection angle jet assembly comprises an eccentric wheel disc (171) and an air blowing pipe (172); one end of the air blowing pipe (172) is connected to the eccentric wheel disc (171), and the other end extends into the mud discharge pipe (18) and is connected to a variable inflow nozzle (17); the outer wall of the air blowing pipe (172) is rotatably connected to a turntable connecting flange (173), and the turntable connecting flange (173) is connected to the outer wall of the mud discharge pipe (18); The eccentric wheel disc (171) is rotatably connected to the water delivery pipeline (3) via a rotating bearing (174), so that the water delivery pipeline (3) is communicated with the air blowing pipeline (172); The surface edge of the eccentric wheel disc (171) is connected to an eccentric connecting shaft (175), the eccentric connecting shaft (175) is rotatably connected to a first connecting rod (176), the other end of the first connecting rod (176) is rotatably connected to a second connecting rod (177), the other end of the second connecting rod (177) is fixedly connected to one end of a rotating shaft (178), and the other end of the rotating shaft (178) is connected to the output end of a driving motor (15); the driving motor (15) is connected to a driving motor base (14).

6. A method for using a dredging pipeline variable inflow direction aeration device, characterized in that: include: Step 1, by starting the air compressor (6), cooperating with closing the water cock (5) and the centrifugal pump (2) on the water delivery pipeline (3), spraying out from the variable inflow nozzle (17) to perform large volume air filling; Step 2, by starting the air compressor (6), cooperating with opening the water cock (5) and the centrifugal pump (2) on the water pipeline (3), jet aeration is performed; Step 3, by starting the air compressor (6), cooperating with closing the water cock (5) and the centrifugal pump (2) on the water delivery pipeline (3), spraying out from the large volume gas filling branch pipe (10), and performing large volume gas filling; as well as Step 4, setting the air compressor (6) to a constant pressure, changing the air volume of the dredging pipeline by changing the size of the variable inflow nozzle (17), and performing constant pressure air filling.

7. The method for using the variable inflow direction aeration device for dredging pipelines according to claim 6, characterized in that: The operation of step 1 is as follows: The stopcock water valve (5) and the centrifugal pump (2) on the water delivery pipeline (3) are closed, and the air compressor (6) is started. High-pressure air is generated from the air compressor (6) and flows along the air delivery pipeline (7) through three air delivery branches (12), the water delivery pipeline (3), and the air blowing pipeline (172), and then is ejected from the variable inflow nozzle (17) to perform air supply and drag reduction transportation work on the mud discharge pipe (18).

8. The method for using the variable inflow direction aeration device for dredging pipelines according to claim 6, characterized in that: The operation of step 2 is as follows: The stopcock valve (5) and the centrifugal pump (2) on the water delivery pipeline (3) are opened, and the air compressor (6) is started. The high-pressure air generated in the air compressor (6) meets the high-pressure water flow generated by the centrifugal pump (2) on the water delivery pipeline (3) to form a water-air mixture, which passes through the air blowing pipeline (172) and is ejected from the variable inflow nozzle (17) to be transported together with the mud; and the mud discharge pipe (18) is subjected to drag reduction and transportation work; The porous medium tubes (11) of three different pore sizes generate microbubbles of different particle sizes after mixing with the high-pressure water flow in the water delivery pipeline (3). The branch pipe ball valve (13) controls the desired bubble size to be generated. The gas filling angle is changed, and the drive motor (14) is started to drive the connected rotating shaft (178) to rotate. The rotation of the rotating shaft (178) drives the first connecting rod (176) and the second connecting rod (177) to swing together, driving the eccentric wheel disc (171) to rotate. The rotation of the eccentric wheel disc (171) drives the blowing pipe (172) and the variable inflow nozzle (17) to rotate, thereby changing the angle at which the gas or water-gas mixture is injected into the mud discharge pipe (18). When there is too much gas in the mud discharge pipe (18), some of the gas added in the mud discharge pipe is released by opening the mud discharge pipe vent valve (19) above each mud discharge pipe (18) at a certain distance.

9. The method for using the variable inflow direction aeration device for dredging pipelines according to claim 6, characterized in that: The operation of step three is as follows: The water cock (5) and the centrifugal pump (2) on the water delivery pipeline (3) are closed, and the air compressor (6) is started. The air in the air compressor (6) generates high-pressure air, which flows along the air delivery pipeline (7) from the large-volume air supply branch pipe (10) into the mud discharge pipe (18) to perform air supply and drag reduction transportation.

10. The method for using the variable inflow direction aeration device for dredging pipelines according to claim 6, characterized in that: The operation of step 4 is as follows: The air compressor (6) is set to a constant pressure, and the air supply amount of the dredging pipeline is changed by changing the size of the variable inflow nozzle (17), and the air supply amount of the dredging pipeline can be controlled between 3% and 5% by the gas meter and the constant pressure regulating valve group (8); According to the critical velocity calculation formula of the Technical Specification for Dredging and Filling Engineering (JTS207-2012): Silt, clay with an average particle size less than 0.05 mm and silt: The sandy soil with an average particle size greater than 0.05 mm is calculated according to the formula: Where: vc——critical velocity of mud (m / s); C——volume concentration of soil particles (%); D——Inner diameter of pipeline (m); vss – the settling velocity of particles in still water (m / s); ds——average particle size of sand particles (m); g——acceleration due to gravity (m / s2); Practical flow rate (economic flow rate) calculation formula: v p =K v v c Where: vp——minimum practical flow velocity (m / s); vc——critical velocity (m / s), calculated according to the average concentration of transported mud; Kv——coefficient; When the flow velocity v in the pipeline is less than vc, the slurry part in the pipeline is in a pushing motion. At this time, the connected rotating shaft (178) is driven to rotate by the driving motor (14). The rotation of the rotating shaft (178) drives the first connecting rod (176) and the second connecting rod (177) to swing together, driving the eccentric wheel (171) to rotate. The rotation of the eccentric wheel (171) drives the blowing pipeline (172) and the variable inflow nozzle (17) to rotate, and the aeration inflow direction is adjusted to be perpendicular to the pipeline direction, that is, θ=90°; When vc<v<vp, the driving motor (14) is controlled to drive the connected rotating shaft (178) to rotate, and the rotation of the rotating shaft (178) drives the first connecting rod (176) and the second connecting rod (177) to swing together, driving the eccentric wheel (171) to rotate, and the rotation of the eccentric wheel (171) drives the blowing pipe (172) and the variable inflow nozzle (17) to rotate, so as to adjust the inflow direction of the gas injection between 0° and 90°, that is, When the flow velocity v in the pipeline is greater than vc, the connected rotating shaft (178) is driven to rotate by the driving motor (14). The rotation of the rotating shaft (178) drives the first connecting rod (176) and the second connecting rod (177) to swing together, thereby driving the eccentric wheel (171) to rotate. The rotation of the eccentric wheel (171) drives the blowing pipeline (172) and the variable inflow nozzle (17) to rotate, thereby adjusting the aeration inflow direction to be parallel to the pipeline direction, that is, θ=0°.

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