A drag-reducing particle dissolving device and a drag-reducing particle preparation method

Abstract

This invention discloses a drag-reducing particle dissolution device and a drag-reducing particle preparation method, belonging to the field of underwater drag reduction technology. It includes a base, an intermediate plate, and a top cover plate, which are sequentially and sealed along the axial direction. Helical channels are formed on the end faces of both the base and the intermediate plate. The top cover plate is encapsulated at the top of the helical channels of the intermediate plate. The helical channels of the base and the bottom surface of the intermediate plate form a helical cavity, and the helical channels of the intermediate plate and the bottom surface of the top cover plate also form a helical cavity, both used to accommodate drag-reducing particles. An inlet and an outlet are respectively formed on the base and the top cover plate. The inlet is located within the helical channels of the base, and the outlet is opposite to the helical channels of the intermediate plate. A flow port is formed within the helical channels of the intermediate plate to facilitate the flow path between the inlet and the outlet. This device uses a disc-type stacked structure to expand the volume of drag-reducing particles, and the combination of vortex-shaped channels increases the buffer path for particle dissolution, thus meeting the requirements for dissolving drag-reducing particles.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of underwater drag reduction, and particularly relates to a drag-reducing particle dissolving device and a drag-reducing particle preparation method. BACKGROUND

[0002] The turbulent flow additive drag reduction is a high-efficiency drag reduction technology, mainly referring to adding water-soluble high polymer in water flow. When the flow is turbulent flow, the high polymer in the turbulent flow will interact with the turbulent flow, and the turbulent flow resistance will be greatly reduced. Only a small amount of polymer additive needs to be added in the turbulent flow to achieve more than 70% drag reduction effect, which has the advantages of small cost, high return, etc. At present, it has been widely applied in fire fighting, pipeline transportation, agricultural irrigation, biological medicine and other fields, and is expected to be applied in underwater vehicles, and has a wide application prospect. However, the current water-soluble high polymer mostly has the problems of slow dissolving speed, easy to be broken by mechanical shearing after dissolving, and the like, which affects the further application of the high polymer. Therefore, it is of great significance to solve the dissolving problem of the high polymer and as far as possible reduce the breaking of the long chain of the high polymer in the dissolving process for the further engineering application of the high polymer underwater drag reduction.

[0003] The prior art discloses a particle dissolving device using a plate structure as a buffer part, which uses plate structures arranged in a staggered and perpendicular manner, and the solution reciprocates and reverberates in the plate structure, and the erosion of particles is strengthened to accelerate the dissolution of particles. The device has simple structure, low cost and easy implementation, but the device cannot realize filtration of undissolved particles and is not suitable for underwater use. The prior art discloses a mechanical stirring type polyacrylamide rapid dissolving device, which mainly comprises a dissolving barrel and a stirring mechanism arranged in the dissolving barrel. The stirring mechanism and an air pipe are arranged at the bottom of the dissolving barrel, so that the polyacrylamide is rapidly dissolved. The device uses independent aeration, and the structure is simpler. The stirring mechanism is provided with an upper stirring piece with a circular hole structure and a lower stirring piece for pushing the solution upward, so that the stirring effect is better. Since the method needs to continuously add polyacrylamide, the dissolution rate is limited, and it is difficult to further increase the dissolution rate. The prior art discloses a powder polyacrylamide dissolving device, which comprises a swelling tank with a stirring device and a cyclone dissolver. A feeder is arranged above the swelling tank. Through the device, the dissolution of polyacrylamide can be accelerated, and the problems of "wire drawing" and "fish eye" can be avoided. However, the device still needs steps such as feeding, stirring and dissolving, and cannot realize real-time dissolution and use of polyacrylamide. The prior art discloses an anti-caking PAM auxiliary dissolving device, which comprises a fixed container with a stirrer, a funnel-shaped discharge slot, a guide pipe and an air nozzle. The device also needs steps such as feeding and stirring, and has problems such as insufficient dissolution of PAM after caking, and inability to completely break the caked PAM particles. The prior art discloses a solid particle medicine self-dissolving device, which mainly comprises a tank body and an inlet and outlet water port, a medicine feeding port, a emptying port, a water distributor and an intercepting net plate. The device is suitable for particles with no viscosity or low viscosity when meeting water. If viscous particles are used, they are easy to caking after swelling when meeting water, and are not suitable for high molecular drag reduction particles.

[0004] Therefore, the current rapid dissolving device has problems such as inability to realize real-time dissolution and use, insufficient dissolution and use of additional power device, thereby reducing the reliability of the device. SUMMARY

[0005] Technical problems to be solved:

[0006] In order to avoid the shortcomings of the prior art, the present application provides a drag reduction particle dissolving device and a drag reduction particle preparation method. The device uses a disc type laminated structure to expand the volume of the drag reduction particles, and combines a vortex line groove to increase the buffer path of the particle dissolution, so as to meet the needs of the drag reduction particles for dissolution. The present application solves the real-time dissolution and use of high molecular drag reduction particles, and improves the dissolution efficiency.

[0007] The technical scheme of the present application is: a drag-reducing particle dissolving device, comprising a bottom disc, an intermediate disc and an upper cover plate which are sequentially and sealingly installed along an axial direction, a spiral groove is formed on the end face of the bottom disc and the intermediate disc, and the upper cover plate is packaged at the top end of the spiral groove of the intermediate disc; the spiral groove of the bottom disc and the bottom surface of the intermediate disc form a spiral cavity, and the spiral groove of the intermediate disc and the bottom surface of the upper cover plate form a spiral cavity, which are used for accommodating the drag-reducing particles.

[0008] A water inlet and a water outlet are respectively formed on the bottom disc and the upper cover plate, the water inlet is located in the spiral groove of the bottom disc, and the water outlet is opposite to the spiral groove of the intermediate disc; a flow-through opening is formed in the spiral groove of the intermediate disc to pass through the flow-through path between the water inlet and the water outlet.

[0009] A further technical scheme of the present application is: the intermediate disc comprises a first intermediate disc and a second intermediate disc which are staggered along the axial direction, a first flow-through opening is formed in the spiral groove of the first intermediate disc, a second flow-through opening is formed in the spiral groove of the second intermediate disc, and the first flow-through opening and the second flow-through opening are staggered to ensure the length of the buffer path of the dissolving particles.

[0010] The number of the first intermediate disc and the second intermediate disc is determined according to the amount of the required drag-reducing particles.

[0011] A further technical scheme of the present application is: the spiral profile of the spiral groove is a vortex line, and the pitch is 20 mm.

[0012] A further technical scheme of the present application is: the spiral grooves of the bottom disc and the intermediate disc are coaxially arranged, the starting edge of the spiral groove is close to the central axis, and the terminal edge is at an angle of 11.3° with the horizontal axis in a positive direction, which maximizes the use of space while ensuring the strength of the device.

[0013] A further technical scheme of the present application is: the spiral grooves of the bottom disc and the intermediate disc are consistent in shape and size, and the radial positions are opposite; the water inlet is located at the terminal point of the spiral groove of the bottom disc, the first flow-through opening is located at the center of the first intermediate disc, the second flow-through opening is located at the terminal point of the spiral groove of the second intermediate disc, and the water outlet is located at the midpoint of the upper cover plate; so as to obtain the longest buffer path of the dissolving particles.

[0014] A further technical scheme of the present application is: a plurality of baffles are arranged in the spiral groove, and the filtering size of the baffles is smaller than the diameter of the drag-reducing particles.

[0015] A rectangular coordinate system is established with the center of the bottom disc and the center disc as the origin; a plurality of baffles are arranged on two coordinate axes in a "cross" shape; the cross-sectional height of the baffles is equal to the depth of the spiral channel; the starting position of the spiral line of the spiral channel is 18mm away from the center of the bottom disc or the center disc; the position of the first row of baffles is the outer rotation of the spiral line to the horizontal axis direction; the position of the second row of baffles is the outer rotation of the first row of baffles along the spiral line by 180°; the position of the third row of baffles is the outer rotation of the second row of baffles along the spiral line by 90°; the position of the fourth row of baffles is the outer rotation of the third row of baffles along the spiral line by 90°, wherein the fourth row of baffles is connected with the first row of baffles; the position of the fifth row of baffles is the outer rotation of the fourth row of baffles along the spiral line by 90°, and so on, until the vertical axis above the last row of the spiral line is arranged.

[0016] A further technical solution of the application is that the baffles are square column baffles composed of a plurality of column bodies arranged side by side, and the distance between adjacent column bodies is less than the diameter of the drag reduction particles.

[0017] A further technical solution of the application is that a plurality of internally threaded blind holes are formed in the outer edge of the bottom disc in the circumferential direction, a plurality of through holes are formed in the outer edge of the intermediate disc and the upper cover plate in the circumferential direction, and the internally threaded blind holes and the through holes are arranged one-to-one corresponding; a plurality of pull rods with externally threaded ends are arranged, one end of each pull rod is sequentially threaded through the through hole of the upper cover plate, the through hole of the intermediate disc and the internally threaded blind hole of the bottom disc, and the other end of each pull rod is installed in cooperation with a nut to fasten the bottom disc, the intermediate disc and the upper cover plate into an integrated structure.

[0018] A further technical solution of the application is that the bottom disc, the intermediate disc and the upper cover plate are all equal-diameter disc structures, and a sealing ring groove is arranged on each adjacent mounting surface for mounting an O-shaped sealing ring, and the whole is sealed and mounted to form a cylindrical body.

[0019] A preparation method of drag reduction particles, the specific steps are as follows:

[0020] Step 1: First, grind the block-shaped polyethylene glycol into powder by a grinder, then mix the polyethylene glycol powder with polyethylene oxide powder, and the mass ratio of polyethylene glycol: polyethylene oxide is 10:0.5-10:5.

[0021] Step 2: Add microcrystalline cellulose to the mixed powder obtained in step 1, so that the mass ratio of the mixed powder to the microcrystalline cellulose is 15:3-15:8, and mix uniformly;

[0022] Step 3: Add water to the mixture obtained in step 2, so that the total mass of the polyethylene glycol powder and the polyethylene oxide mixture, the mass of the microcrystalline cellulose and the mass of the water are 15:3:2-15:8:4, and mix to make the water evenly wet the powder;

[0023] Step 4: the wetted powder obtained in step 3 is added into a screw extruder for extrusion, wherein the extrusion diameter is 2mm-5mm, and a long cylindrical extruded strip is obtained;

[0024] Step 5: the long cylindrical extruded strip is placed into a rounding part of the screw extruder for rounding, and the rounding time is 1min-10min; after rounding, the irregularly shaped drag-reducing particles are obtained, and the particle size is 2mm-5mm.

[0025] Working principle:

[0026] The prepared drag-reducing particles are uniformly added into the spiral grooves of the bottom disc and the intermediate discs, and the particles added in each disc do not exceed the wall height of the spiral groove; then the bottom disc, the first intermediate disc, the second intermediate disc and the upper cover plate are assembled in sequence, and the four are fixed through the pull rod, and finally the nut above the pull rod is tightened.

[0027] When the amount of particles required to be quickly dissolved is large, the number of the first intermediate disc and the second intermediate disc can be increased, and the assembly sequence of the first intermediate disc, the second intermediate disc, the first intermediate disc, the second intermediate disc, the first intermediate disc, …, the upper cover plate can be maintained, and the intermediate discs can be increased as long as the space permits, and the assembly sequence of the bottom disc, the first intermediate disc, the second intermediate disc, the first intermediate disc, the second intermediate disc, the first intermediate disc, …, the upper cover plate is followed, and the pull rod and the nut are fastened.

[0028] After the drag-reducing particles are added into the grooves of the discs and assembled, the pneumatic connector installed at the water inlet of the bottom disc is connected to the matched pipeline for water delivery, and the water will be dissolved by the particles through the spiral grooves, and then flow to the center of the spiral groove of the bottom disc, and then enter the spiral groove of the first intermediate disc through the through hole at the center of the first intermediate disc, and then gradually flow from the center of the spiral groove of the first intermediate disc to the terminal end of the first intermediate disc, and then enter the spiral groove of the second intermediate disc through the through hole at the terminal end of the second intermediate disc, and then continue to flow along the spiral groove to the center of the spiral groove of the second intermediate disc, and finally flow out from the pipeline connected to the pneumatic connector installed at the water outlet of the upper cover plate, so that the drag-reducing particles are quickly dissolved, and the real-time use of the dissolved solution can be realized.

[0029] Beneficial effects

[0030] The beneficial effects of the present application are:

[0031] The application solves the problem of difficulty in carrying the high polymer drag reduction agent by mixing and preparing the soluble polymer into drag reduction particles; the fast dissolving device of the application, in combination with the drag reduction particles, can realize fast dissolving of the particles and fast obtaining of the drag reduction solution, avoiding the problem of formation of "fish eye" when the current high polymer dissolving rate is too fast, and realizing real-time dissolving and use of the drag reduction particles.

[0032] The dissolving device of the application is in cylindrical shape, suitable for underwater rotary body models, and can be installed in the rotary body models to save space to the maximum extent.

[0033] The dissolving device of the application can be designed in size according to the use scene and scaled equally, and is convenient and simple to process, use and carry, and can be applied in large-scale engineering.

[0034] The dissolving device of the application can improve the volume of the groove as much as possible under the condition of a certain device size, so that sufficient particles can be placed in the groove.

[0035] The square column baffle of the application is integrated with the disc, does not need to be additionally installed, almost does not fail, and saves the installation cost of this part.

[0036] The size of the through hole in the bottom disc and the intermediate disc can be adjusted according to the actual water flow.

[0037] The dissolving device is not limited to dissolving drag reduction particles, but can also be used to dissolve other water-soluble particles, and has a wide range of applications. DETAILED DESCRIPTION

[0038] Figure 1 The actual picture of the prepared drag reduction particles;

[0039] Figure 2 is a three-dimensional schematic view of the chassis;

[0040] Figure 3 is a two-dimensional engineering drawing of the chassis;

[0041] Figure 4 is a three-dimensional schematic view of the first intermediate disc;

[0042] Figure 5 is a two-dimensional engineering drawing of the first intermediate disc;

[0043] Figure 6 is a three-dimensional schematic view of the second intermediate disc;

[0044] Figure 7 is a two-dimensional engineering drawing of the second intermediate disc;

[0045] Figure 8 is a two-dimensional engineering drawing of the upper cover plate;

[0046] Figure 9 is a two-dimensional engineering drawing of the pull rod;

[0047] Figure 10 is a three-dimensional schematic view of the assembly of the drag reduction particle dissolving device;

[0048] Figure 11 is an assembly drawing of the drag reduction particle dissolving device;

[0049] Figure 12 is a comparison of the drag reduction effect of the real-time dissolving particles and the prepared uniform 10ppm, 30ppm, 50ppm drag reduction effect in the water tunnel experiment, wherein the solid circle symbol represents the measured drag reduction effect of the real-time dissolving particles, and the square, triangle and diamond hollow symbols represent the measured jet drag reduction effect of the solutions with concentrations of 10ppm, 30ppm and 50ppm, respectively;

[0050] Figure 13 is a change of the drag reduction rate of the real-time dissolving particles with time in the water tunnel experiment.

[0051] BRIEF DESCRIPTION OF DRAWINGS DETAILED DESCRIPTION

[0052] The embodiments described below with reference to the drawings are exemplary and are intended to explain the present application, and cannot be understood as a limitation of the present application.

[0053] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, which are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0054] Based on the prior art, the rapid dissolving device cannot realize real-time dissolving use, the dissolving is insufficient, and additional power device is used, thereby reducing the reliability of the device. The present application designs a drag-reducing particle dissolving device, which comprises a bottom disc, an intermediate disc and an upper cover plate which are sequentially sealed and installed in the axial direction. The end faces of the bottom disc and the intermediate disc are both provided with a spiral channel, and the upper cover plate is packaged at the top end of the spiral channel of the intermediate disc. The spiral channel of the bottom disc and the bottom surface of the intermediate disc form a spiral cavity, and the spiral channel of the intermediate disc and the bottom surface of the upper cover plate form a spiral cavity, which are both used for accommodating drag-reducing particles.

[0055] The bottom disc and the upper cover plate are respectively provided with a water inlet and a water outlet. The water inlet is located in the spiral channel of the bottom disc, and the water outlet is opposite to the spiral channel of the intermediate disc. The spiral channel of the intermediate disc is provided with a flow-through opening to pass through the flow-through path between the water inlet and the water outlet.

[0056] After the drag-reducing particles are added to the spiral channel and the assembly is completed, the pneumatic connector installed at the water inlet of the bottom disc is connected to the matched pipeline for water delivery. The water will dissolve the particles through the spiral channel, and finally flow out from the pipeline connected to the pneumatic connector at the water outlet of the upper cover plate, thereby realizing the rapid dissolving of the drag-reducing particles and realizing the real-time dissolving use of the dissolving solution.

[0057] Embodiment:

[0058] The rapid dissolving device in the embodiment comprises a bottom disc 1, an intermediate disc, an upper cover plate 5 and a pull rod 4. The diameter of the bottom disc 1 is 290mm, and the thickness is 24mm. The diameter of the intermediate disc is 290mm, and the thickness is 26.5mm. The diameter of the upper cover plate 5 is 290mm, and the thickness is 13mm. The diameter of the pull rod 4 is 8mm, and the total length is 135mm.

[0059] The bottom disc 1 is in the shape of a disc, and eight internally threaded blind holes are evenly distributed along the circumferential edge of the end face of the bottom disc 1. The model of the internally threaded holes is M8x1, the internally threaded blind holes are fitted with steel wire bushings, the model of the steel wire bushings is ST8x1, the strength of the internal threads is improved, and the distance from the center of the internally threaded blind holes to the center of the disc is 135 mm. A spiral groove is formed in the bottom disc, the depth of the groove is 19 mm, the wall thickness of the groove is 1.5 mm, the spiral line is a vortex line, the pitch is 20 mm, the initial degree is 150°, and the number of turns is 5.6. Square column baffles are arranged in the spiral groove. A rectangular coordinate system is established with the center of the disc as the origin. All the square column baffles are arranged on the two coordinate axes, and the overall arrangement is in the shape of a cross. Four square column baffles are arranged between adjacent vortex lines in the same direction, the four square column baffles are evenly arranged, the distance between the square column baffles is 2 mm, and the shape and size of the square column are 2.4 mm x 2.4 mm x 19 mm. The starting position of the vortex line is 18 mm from the center of the disc, the position of the first row of square columns is the vortex line rotating outward to the horizontal axis direction, the position of the second row of square columns is the first row of square columns rotating outward by 180° along the vortex line, the position of the third row of square columns is the second row of square columns rotating outward by 90° along the vortex line, the position of the fourth row of square columns is the third row of square columns rotating outward by 90° along the vortex line, and the fourth row of square columns is connected to the first row of square columns. The position of the fifth row of square columns is the fourth row of square columns rotating outward by 90° along the vortex line, and the process is repeated until the end of the groove extends to the edge and is 11.3° to the horizontal axis in the forward direction. A G1 / 2 internally threaded through hole is formed at the end of the groove for mounting a pneumatic connector. A sealing ring groove is formed on the inner side of the circumferential internally threaded blind hole for mounting an O-shaped sealing ring, the model is 248x3.55, the distance from the inner edge of the sealing ring groove to the center of the disc is 122.5 mm, the groove depth is 2.75 mm, and the groove width is 5 mm.

[0060] The intermediate disc includes two, the first intermediate disc 2 and the second intermediate disc 3. The first intermediate disc 2 is in the shape of a disc structure, and eight through holes with a diameter of 9 mm are uniformly distributed along the circumferential edge of the end face of the first intermediate disc 2, and the distance from the center of the through hole to the center of the disc is 135 mm. A helical groove is formed in the first intermediate disc, the groove is 19 mm deep, and the groove wall is 1.5 mm thick. The helical line is a vortex line, the pitch is 20 mm, the initial degree is 150°, and the number of turns is 5.6. In the helical groove, square column baffles are provided. A rectangular coordinate system is established with the disc center as the circle point. All square column baffles are located above the two coordinate axes, and the overall arrangement is in the shape of a cross. Four square column baffles are provided between adjacent vortex lines in the same direction, and the four square column baffles are uniformly arranged. The distance between the square column baffles is 2 mm, and the shape and size of the square column are 2.4 mm x 2.4 mm x 19 mm. The starting position of the vortex line is 18 mm from the center of the disc, and a through hole with a diameter of 18 mm is formed at the disc center. The position of the first row of square columns is the vortex line rotating outward to the horizontal axis direction, the position of the second row of square columns is the first row of square columns rotating outward by 180° along the vortex line, the position of the third row of square columns is the second row of square columns rotating outward by 90° along the vortex line, the position of the fourth row of square columns is the third row of square columns rotating outward by 90° along the vortex line, and the fourth row of square columns is connected to the first row of square columns. The position of the fifth row of square columns is the fourth row of square columns rotating outward by 90° along the vortex line, and the extension of the groove is sequentially extended to the edge and is 11.3° to the horizontal axis in the forward direction. A sealing ring groove is formed in the inner side of the through hole uniformly distributed on the edge of the first intermediate disc 2, for installing an O-shaped sealing ring, the type is 248 x 3.55, the distance from the inner edge of the sealing ring groove to the center of the disc is 122.5 mm, the groove depth is 2.75 mm, and the groove width is 5 mm.

[0061] The second intermediate disc 3 is in the shape of a disc structure, and eight through holes with a diameter of 9 mm are uniformly distributed on the edge of the end face of the second intermediate disc 3 in the circumferential direction, and the distance from the center of the through hole to the center of the disc is 135 mm. A spiral groove is formed in the second intermediate disc, the groove is 19 mm deep, and the groove wall is 1.5 mm thick. The spiral line is a vortex line, the pitch is 20 mm, the initial degree is 150°, and the number of turns is 5.6. In the spiral line groove, a square column baffle is arranged. A rectangular coordinate system is established with the center of the disc as the origin. All square column baffles are located on two coordinate axes, and the overall arrangement is in the shape of a cross. Four square column baffles are arranged between adjacent vortex lines in the same direction, and the four square column baffles are uniformly arranged. The distance between the square column baffles is 2 mm, and the shape and size of the square column are 2.4 mm x 2.4 mm x 19 mm. The starting position of the vortex line is 18 mm from the center of the base disc, the position of the first row of square columns is the vortex line rotating outward to the horizontal axis direction, the position of the second row of square columns is the first row of square columns rotating outward by 180° along the vortex line, the position of the third row of square columns is the second row of square columns rotating outward by 90° along the vortex line, the position of the fourth row of square columns is the third row of square columns rotating outward by 90° along the vortex line, and the fourth row of square columns is connected with the first row of square columns. The position of the fifth row of square columns is the fourth row of square columns rotating outward by 90° along the vortex line, and the last groove extends to the edge and is 11.3° to the horizontal axis in the positive direction. The groove end is provided with an internally threaded through hole with a diameter of 18 mm. A sealing ring groove is formed on the inner side of the uniformly distributed through hole of the edge of the second intermediate disc 3, and an O-shaped sealing ring is arranged in the sealing ring groove. The type is 248x3.55, the distance from the inner edge of the sealing ring groove to the center of the disc is 122.5 mm, the groove depth is 2.75 mm, and the groove width is 5 mm.

[0062] The upper cover plate 5 is in the shape of a disc structure, and a through hole with a diameter of 9 mm is uniformly formed on the circumferential edge of the upper cover plate 5 in the circumferential direction, and the distance from the center of the through hole to the center of the disc is 135 mm. A G1 / 2 threaded inner through hole is formed at the center of the upper cover plate, which is used to connect a pneumatic connector.

[0063] The pull rod 4 is in the shape of a cylinder, and the two ends are separately provided with external threads with the same type but different lengths, and the type of the external threads is M8x1-6h. The length of the thread at one end is 12 mm, and the length of the thread at the other end is 20 mm. The middle part is a smooth surface.

[0064] The internally threaded blind hole of the base disc 1, the uniformly distributed through hole of the intermediate disc, and the uniformly distributed through hole of the upper cover plate are at the same radial position and can be completely aligned.

[0065] The sealing ring grooves of the base disc 1 and the intermediate disc, the starting position of the vortex line, and the end position of the vortex line are at the same radial position.

[0066] The bottom disc 1, the intermediate disc and the upper cover plate 5 are connected and fixed by the pull rod 4 and the nut. In the assembly process, the O-shaped sealing ring is loaded into the sealing ring groove of the bottom disc and the intermediate disc. The short thread of the eight pull rods 4 is connected with the circumferential uniform internal thread blind hole of the bottom disc 1 in turn, and the long thread end of the pull rod 4 passes through the eight circumferential through holes of the first intermediate disc 2, the second intermediate disc 3 and the upper cover plate 5 in turn, and finally the long thread end is assembled with the nut, and the model of the nut is M8x1.

[0067] The G1 / 2 thread of the bottom disc 1 and the upper cover plate 5 is a pneumatic quick connector with G1 / 2 thread, and the interface caliber range of the pneumatic quick connector is 12mm.

[0068] The drag reduction particles used in the embodiment are a mixture of polyethylene oxide and polyethylene glycol, and the preparation method is as follows:

[0069] Step 1. First, a sufficient amount of block-shaped polyethylene glycol is taken and broken into powder by using a grinding machine, then part of the polyethylene glycol powder is mixed with polyethylene oxide powder, and the mass ratio of polyethylene glycol: polyethylene oxide is 10:2.

[0070] Step 2. Add microcrystalline cellulose to the mixed powder obtained in step 1, so that the mass ratio of the mixed powder to the microcrystalline cellulose is 3:1, and mix uniformly.

[0071] Step 3. Add water to the uniformly mixed powder obtained in step 2, so that the total mass of the polyethylene glycol and polyethylene oxide mixture, the mass of the microcrystalline cellulose, and the mass of the water are 15:5:2, and mix to make the water evenly wet the powder.

[0072] Step 4. The wet powder obtained in step 3 is added to a screw extruder for extrusion, with an extrusion diameter of 2mm, to obtain a long cylindrical extruded strip.

[0073] Step 5. Place the long cylindrical extruded strip in the rounding part of the screw extruder for rounding, with a rounding time of 5min. After rounding, the irregularly round drag reduction particles with a particle size of about 2mm are obtained.

[0074] The prepared particles are uniformly added to the grooves of the bottom disc and the intermediate disc, and the mass of the particles added to each disc is 100g. Then the bottom disc 1, the first intermediate disc 2, the second intermediate disc 3, the first intermediate disc 2, the second intermediate disc 3 and the upper cover plate 5 are assembled in order, and the five are fixed by the pull rod 4, and finally the nut above the pull rod 4 is tightened.

[0075] After the drag-reducing particles are added to each disc helical groove and the assembly is completed, a pipe with an outer diameter of 12 mm is connected to the pneumatic joint installed at the bottom disc 1, and water is transported, which will pass through the vortex-shaped groove, and the particles will be dissolved, and when the water flow reaches the center of the vortex-shaped groove, it will pass through the through hole in the center of the first intermediate disc 2 and enter the vortex-shaped groove of the first intermediate disc 2, and the water flow will gradually flow from the center of the vortex-shaped groove of the first intermediate disc 2 to the end of the disc, and then pass through the through hole at the end of the second intermediate disc 3 and enter the vortex-shaped groove of the second intermediate disc 3, and continue along the vortex-shaped groove to the center of the vortex-shaped groove of the second intermediate disc 3, and then pass through the through hole in the center of the second first intermediate disc 2 and enter the second first intermediate disc 2, and the water flow will gradually flow from the center of the vortex-shaped groove of the second first intermediate disc 2 to the end of the disc, and then pass through the through hole at the end of the second second intermediate disc 3 and enter the second second intermediate disc 3, and continue along the vortex-shaped groove to the center of the vortex-shaped groove of the second second intermediate disc 3, and finally flow out from the pipe connected to the pneumatic joint at the center outlet of the upper cover plate 5, thereby realizing real-time dissolution of the drag-reducing particles.

[0076] The real-time dissolved solution is directly subjected to water tunnel injection drag reduction experiment, and the results are shown in Figure 12 The main flow velocity is 4 m / s, and the injection rates are 59.8 L / h, 119.6 L / h, and 179.4 L / h, respectively. It can be seen that at a main flow velocity of 4 m / s, the drag reduction rate increases with the increase of the injection rate, and the maximum drag reduction rate is 21.2%.

[0077] Figure 13 The drag reduction effect of the real-time dissolved particles is based on the measured drag reduction effect of the real-time dissolved particles in the water tunnel experiment under the conditions of a flow velocity of 4 m / s and an injection rate of 179.4 L / h. It can be seen that the real-time dissolved solution of the particles has a significant drag reduction effect, and when the continuous dissolution time of the particles is 80 minutes, it still has a drag reduction effect of more than 5%, showing excellent durability.

[0078] Comparative Example:

[0079] In order to compare the concentration of the real-time dissolved particles, uniform polyethylene oxide solutions with different concentrations are configured and subjected to water tunnel experiment drag reduction test. In the water tunnel injection drag reduction experiment, the higher the concentration of the drag reduction solution and the greater the injection rate, the greater the drag reduction rate, so the concentration of the real-time dissolved solution of the particles can be verified by comparing the drag reduction rate.

[0080] The specific steps are as follows

[0081] Step 1. 0.1 g, 0.3 g, and 0.5 g of polyethylene oxide particles are weighed with a balance and placed in the weighing paper, respectively, and then 10 L of water is measured three times and placed in an open container.

[0082] Step 2. Weigh 0.1g, 0.3g, 0.5g of polyethylene oxide particles respectively, and slowly add them into three 10L of clean water, while stirring with a glass rod.

[0083] Step 3. After the particles are completely added, continue to stir with a glass rod for 5 minutes. After stirring is complete, we get a uniform solution with concentrations of 10ppm, 30ppm and 50ppm.

[0084] Step 4. The prepared 10ppm, 30ppm and 50ppm solutions are used for water tunnel injection drag reduction experiments. At a main flow speed of 4m / s and a injection rate of 119.6L / h, 179.4L / h, the drag reduction effect of the solution is tested respectively. The drag reduction results are shown in Figure 12 .

[0085] The drag reduction results of 10ppm, 30ppm and 50ppm are Figure 12 The drag reduction results of the square, triangle and diamond hollow symbols in the above specific real-time method are compared with the drag reduction results of the real-time dissolution of the particles. The drag reduction effect of the solution obtained in the above specific real-time method is closest to 30ppm, so it can be considered that the concentration of the real-time dissolution of the particles in the above specific real-time method is about 30ppm.

[0086] Although the embodiments of the present application have been shown and described above, it should be understood that the above embodiments are exemplary and should not be construed as limiting the present application. Those skilled in the art can make changes, modifications, replacements and variations to the above embodiments without departing from the principles and purposes of the present application within the scope of the present application.

Claims

1. A drag-reducing particle dissolution device, characterized by: The device comprises a bottom disc, a middle disc and a top cover plate which are sequentially sealed along the axial direction, the end faces of the bottom disc and the middle disc are provided with helical grooves, and the top cover plate is sealed at the top end of the helical groove of the middle disc; the helical groove of the bottom disc and the bottom surface of the middle disc form a helical cavity, and the helical groove of the middle disc and the bottom surface of the top cover plate form a helical cavity, which are used for accommodating the drag-reducing particles; The bottom disc and the top cover plate are respectively provided with a water inlet and a water outlet, the water inlet is located in the helical groove of the bottom disc, and the water outlet is opposite to the helical groove of the middle disc; the helical groove of the middle disc is provided with a flow-through opening for the flow-through path between the water inlet and the water outlet; The middle disc comprises a first middle disc and a second middle disc which are staggered along the axial direction, the helical groove of the first middle disc is provided with a first flow-through opening, the helical groove of the second middle disc is provided with a second flow-through opening, and the first flow-through opening and the second flow-through opening are staggered to ensure the length of the buffer path of the dissolved particles; The number of the first middle disc and the second middle disc is determined according to the amount of the required drag-reducing particles.

2. The drag-reducing particle dissolution device of claim 1, wherein: The helical profile of the helical groove is a vortex line, and the pitch is 20 mm.

3. The drag-reducing particle dissolution device of claim 1, wherein: The helical grooves of the bottom disc and the middle disc are coaxially arranged, the starting edges of the helical grooves are close to the central axis, and the terminal edges are at an angle of 11.3° with the horizontal axis.

4. The drag-reducing particle dissolution apparatus of claim 3, wherein: The helical grooves of the bottom disc and the middle disc are consistent in shape and size, and the radial positions are opposite; the water inlet is located at the terminal end of the helical groove of the bottom disc, the first flow-through opening is located at the center of the first middle disc, the second flow-through opening is located at the terminal end of the helical groove of the second middle disc, and the water outlet is located at the midpoint of the top cover plate; so as to obtain the longest buffer path of the dissolved particles.

5. The drag-reducing particle dissolution device of claim 1, wherein: A plurality of baffles are arranged in the helical groove, and the filtering size of the baffles is smaller than the diameter of the drag-reducing particles; A rectangular coordinate system is established with the center of the bottom disc and the center disc as the origin; the baffles are arranged in a "cross" shape on the two coordinate axes; the cross-sectional height of the baffles is equal to the depth of the helical groove; the starting position of the vortex line of the helical groove is 18 mm away from the center of the bottom disc or the center disc, the first row of baffles is located at the outer rotation direction of the vortex line to the horizontal axis, the second row of baffles is located at the outer rotation direction of the first row of baffles by 180° along the vortex line, the third row of baffles is located at the outer rotation direction of the second row of baffles by 90° along the vortex line, the fourth row of baffles is located at the outer rotation direction of the third row of baffles by 90° along the vortex line, and the fourth row of baffles is connected to the first row of baffles, the fifth row of baffles is located at the outer rotation direction of the fourth row of baffles by 90° along the vortex line, and so on, until the last row of baffles is arranged above the vertical axis of the vortex line.

6. A drag-reducing particle dissolution device according to claim 5, wherein: The baffles are square column baffles composed of a plurality of column bodies arranged side by side, and the distance between adjacent column bodies is smaller than the diameter of the drag-reducing particles.

7. The drag-reducing particle dissolution apparatus of claim 1, wherein: The outer edge of the bottom disc is provided with a plurality of internally threaded blind holes in the circumferential direction, the outer edge of the intermediate disc and the upper cover plate are both provided with a plurality of through holes in the circumferential direction, and the internally threaded blind holes and the through holes are one-to-one corresponding; a plurality of pull rods with external threads at both ends are provided, one end of each of the pull rods is sequentially threaded through the through hole of the upper cover plate, the through hole of the intermediate disc and the internally threaded blind hole of the bottom disc, and the other end of each of the pull rods is matched with a nut for installation, so as to fasten the bottom disc, the intermediate disc and the upper cover plate into an integrated structure.

8. A drag-reducing particle dissolution device according to claim 7, wherein: The bottom disc, the intermediate disc and the upper cover plate are all equal-diameter disc structures, and a sealing ring groove is arranged on the adjacent mounting surface for mounting an O-shaped sealing ring, and after overall sealing and mounting, a cylindrical body is formed.

9. A method for producing drag-reducing particles by using the drag-reducing particle dissolving apparatus according to any one of claims 1 to 8, characterized by The specific steps are as follows: Step 1: first, grind the block-shaped polyethylene glycol into powder, then mix the polyethylene glycol powder with polyethylene oxide powder, and the mass ratio of polyethylene glycol: polyethylene oxide = 10:0.5-10:5; Step 2: add microcrystalline cellulose to the mixed powder obtained in step 1, so that the mass ratio of the mixed powder to the microcrystalline cellulose is 15:3-15:8, and mix uniformly; Step 3: add water to the mixture obtained in step 2, so that the total mass of the polyethylene glycol powder and the polyethylene oxide mixture: the mass of the microcrystalline cellulose: the mass of the water is 15:3:2-15:8:4, and blend, so that the water uniformly wets the powder; Step 4: add the wet powder obtained in step 3 to the screw extruder for extrusion, wherein the extrusion diameter is 2mm-5mm, and a long cylindrical extruded strip is obtained; Step 5: place the long cylindrical extruded strip in the rounding part of the screw extruder for rounding, the rounding time is 1min-10min, and after rounding, the irregular-shaped drag-reducing particles are obtained, and the particle size is 2mm-5mm.

Images