Mud and sand stirring and separating device and separating method

Abstract

The invention discloses a mud and sand stirring and separating device which comprises a stirring tank, a mud and sand input pump, a clear liquid separating pump, a mud output pump and a sand output pump. The stirring tank comprises a tank body and a stirring motor, the stirring motor is connected with stirring blades, and circulation is formed in the tank body by rotating the stirring blades; the tank body comprises a cylindrical tank body, and the lower end of the tank body is connected with a conical bottom; the mud and sand input pump, the clear liquid separation pump and the mud output pump are respectively connected with the tank body; the bottom of the conical bottom is connected with a sand output pump through a sand input pipe; the layering characteristic of particles with different particle sizes in the slurry stirring process is utilized, clear liquid, slurry and sand at different depth positions in the stirring tank are extracted respectively, mud and sand stirring and rapid separation are achieved, mud and sand with different particle sizes can be separated without using a vibration screening technology, the complexity of equipment is effectively reduced, and the production efficiency is improved. And the mud and sand separation efficiency can be effectively improved.

Description

Technical Field

[0001] The present application relates to the field of geotechnical engineering technology, and in particular to a mud-sand mixing and separation device and a separation method. Background Art

[0002] Dredged mud is a mixture of mud and water produced by dredging sediments in rivers, lakes, shallow seas and other water bodies. It is caused by the fact that after industrial wastewater, domestic sewage, urban surface runoff and atmospheric precipitation enter the water body, the particulate matter, colloids and water-soluble salts therein are deposited to the bottom of the water body under certain hydraulic conditions through physical and chemical processes such as adsorption, complexation and chemical reaction, forming sediments.

[0003] The physical properties and chemical composition of dredged mud are significantly different from those of terrestrial soft soil. In terms of physical properties, dredged mud is usually composed of fine granular substances with different particle sizes, mainly including sand, mud, sand and powdery substances; in terms of chemical composition, dredged mud contains rich organic and inorganic substances. Organic matter mainly comes from suspended matter in the water body and the deposition of organic waste, including plant residues, algae, humus, etc. Inorganic matter mainly comes from dissolved substances in the water body and inorganic salts and minerals in the sediment, including nitrogen, phosphorus, potassium, calcium, magnesium, etc. These chemical components have a certain impact on the nutritional status and ecological environment of the water body, so proper treatment and disposal are required during the dredging process.

[0004] At present, how to quickly recycle dredged mud has become a major problem in the dredging industry. Due to the high water content of dredged mud, its fluid state, and wide particle gradation (maximum particle size can reach 5cm), the rapid recycling of dredged mud must first separate the coarse and fine particles of dredged mud. At present, the treatment of dredged mud is to first vibrate and screen the dredged mud from the rake suction, cutter suction or grab bucket, and then separate the coarse and fine particles in the dredged mud before the next step of treatment. However, the existing vibration screening technology and equipment are complex, power-hungry, and easy to clog holes. It is necessary to develop a more efficient and simple mud-sand separation technology. Summary of the invention

[0005] The purpose of the present invention is to avoid the shortcomings of the prior art and provide a mud-sand mixing and separation device and separation method.

[0006] The purpose of the present invention is achieved through the following technical solutions:

[0007] According to one aspect of the present invention, a mud-sand stirring and separation device is provided, comprising: a stirring tank, a mud-sand input pump, a clear liquid separation pump, a mud output pump and a sand output pump; the stirring tank comprises a tank body and a stirring motor, the stirring motor is connected with a stirring blade, and a circulation is formed in the tank body by rotating the stirring blade;

[0008] The tank body comprises a cylindrical tank body, the lower end of which is connected to a conical bottom; the tank body is provided with a first pipe opening, a second pipe opening and a third pipe opening which are arranged in sequence from high to low;

[0009] The mud and sand input pump is connected to the first pipe port through the connected mud and sand output pipe, the clear liquid separation pump is connected to the second pipe port through the connected clear liquid input pipe, and the mud output pump is connected to the third pipe port through the connected mud input pipe;

[0010] The bottom of the conical bottom is connected to the sand output pump through a sand input pipe;

[0011] The mud and sand input pump is used to input the first mud and sand mixture into the mixing tank; the mixing tank is used to separate the clear liquid, the second mud and sand mixture and the third mud and sand mixture in the first mud and sand mixture by utilizing the circulation; the clear liquid separation pump is used to output the clear liquid; the mud output pump is used to output the second mud and sand mixture; the sand output pump is used to output the third mud and sand mixture; wherein the particle diameter of the third mud and sand mixture is greater than the particle diameter of the second mud and sand mixture.

[0012] Specifically, the particle size of the second mud-sand mixture is greater than 0.062 mm and less than or equal to 2.0 mm; the particle size of the third mud-sand mixture is greater than 2.0 mm.

[0013] More specifically, in the first mud-sand mixture input, the mass of particles with a particle size greater than 2.0 mm accounts for a ratio a1 of the mass of the total solid particles;

[0014] The proportion of the mass of particles with a particle size less than 0.062 mm to the total mass of solid particles is a2;

[0015] The flow rate of the sand output pump is a1 times the flow rate of the mud and sand input pump;

[0016] The flow rate of the clear liquid separation pump is a2 times the flow rate of the mud and sand input pump.

[0017] More specifically, the angle between the mud and sand output pipe and the tangent of the tank body is less than 5 degrees; the sum of the flow rates of the clear liquid separation pump, the mud output pump and the sand output pump differs from the flow rate of the mud and sand input pump by less than 5% of the flow rate of the mud and sand input pump.

[0018] In the above, the ratio of the stirring radius of the stirring blade to the radius of the tank body is between 1 / 3 and 2 / 3.

[0019] Furthermore, the stirring direction of the stirring blade is consistent with the direction in which the first mud-sand mixture is input into the stirring tank; the directions in which the clear liquid input pipe and the mud input pipe are output are consistent with the stirring direction of the stirring blade.

[0020] According to another aspect of the present application, a mud-sand stirring and separation method is provided, which is applied to the above-mentioned mud-sand stirring and separation device, and comprises the following steps:

[0021] S1: Determine the gradation of each particle component in the input first mud-sand mixture, and determine the proportion a1 of the mass of particles with a particle size greater than 2.0 mm to the total mass of solid particles, and determine the proportion a2 of the mass of particles with a particle size less than or equal to 0.062 mm to the total mass of solid particles;

[0022] S2: Determine the working parameters of the stirring motor, the mud and sand input pump, the clear liquid separation pump, the mud output pump and the sand output pump according to the gradation of each particle component in the first mud and sand mixture and the size of the stirring tank;

[0023] S3: start the stirring motor, mud and sand input pump, clear liquid separation pump, mud output pump, and sand output pump in sequence according to the determined working parameters;

[0024] S4: Adjust the flow rates of the mud and sand input pump, the clear liquid separation pump, the mud output pump and the sand output pump respectively, so that the sum of the flow rates of the clear liquid separation pump, the mud output pump and the sand output pump differs from the flow rate of the mud and sand input pump by less than 5% of the flow rate of the mud and sand input pump.

[0025] Specifically, step S2 also includes the following steps: calculating the range of the circulation velocity according to the particle size and sedimentation velocity of the particles, and determining the rotation speed of the stirring motor according to the range of the circulation velocity.

[0026] More specifically, the circulation velocity The circulation speed

[0027] Among them, ρ s is the density of mud and sand; ω is the density of clean water; r2 is the inner diameter of the mixing tank;

[0028] h1 is the distance between the third pipe opening and the upper edge of the stirring tank;

[0029] h2 is the distance between the first pipe opening and the upper edge of the stirring tank;

[0030] h3 is the distance between the second pipe opening and the upper edge of the stirring tank.

[0031] More specifically, the average angular velocity of the stirring blade is:

[0032] The beneficial effects achieved by the present invention are as follows: a mud and sand mixing and separation device is provided, comprising: a mixing tank, a mud and sand input pump, a clear liquid separation pump, a mud output pump and a sand output pump; the mixing tank comprises a tank body and a mixing motor, the mixing motor is connected with a mixing blade, and a circulation is formed in the tank body by rotating the mixing blade; the tank body comprises a cylindrical tank body, and a conical bottom is connected to the lower end of the tank body; the side surface of the tank body is provided with a first pipe opening, a second pipe opening and a third pipe opening in sequence from high to low; the mud and sand input pump is connected to the first pipe opening through a connected mud and sand output pipe, the clear liquid separation pump is connected to the second pipe opening through a connected clear liquid input pipe, and the mud output pump is connected to the third pipe opening through a connected mud input pipe; the bottom of the conical bottom is connected to the sand output pump through a sand input pipe; the mud and sand input pump is used to input the first mud and sand mixture into the mixing tank in a mixing tank; the mixing tank is used to utilize the circulation to separate the clear liquid, the second mud-sand mixture and the third mud-sand mixture in the first mud-sand mixture; the clear liquid separation pump is used to output the clear liquid; the mud output pump is used to output the second mud-sand mixture; the sand output pump is used to output the third mud-sand mixture; wherein the particle diameter of the third mud-sand mixture is greater than the particle diameter of the second mud-sand mixture; in the technical solution of the present invention, the stratification characteristics of particles of different particle sizes during the mud stirring process are utilized to realize the stratification and separate extraction of the clear liquid, the second mud-sand mixture and the third mud-sand mixture in the mixing tank, and quickly realize the stirring and separation of mud and sand, that is, mud and sand of different particle sizes can be separated without using vibration screening technology, which not only effectively reduces the complexity of the equipment, but also effectively improves the efficiency of mud and sand separation. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions in the embodiments of the present application, a brief introduction will be given below to the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0034] Figure 1 It is a schematic diagram of the overall structure of a mud-sand mixing and separation device according to an embodiment of the present application;

[0035] Figure 2 It is a schematic diagram of a top view of a mud-sand mixing and separation device according to an embodiment of the present application;

[0036] Figure 3 is a schematic flow chart of a mud-sand stirring and separation method according to an embodiment of the present application;

[0037] in, Figure 1 to Figure 2 Including:

[0038] 1. stirring tank; 101. stirring motor; 102. rotating shaft; 103. stirring blade;

[0039] 2. Mud and sand input pump; 201. Mud and sand input pipe; 202. Mud and sand output pipe;

[0040] 3. Sand output pump; 301. Sand input pipe; 302. Sand output pipe;

[0041] 4. Mud output pump; 401. Mud input pipe; 402. Mud output pipe;

[0042] 5. Clear liquid separation pump; 501. Clear liquid inlet pipe; 502. Clear liquid outlet pipe. DETAILED DESCRIPTION

[0043] In order to make the purpose, technical solution and advantages of the present application clearer, the technical solution of the present application will be clearly and completely described through the implementation method with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present application.

[0044] Example 1

[0045] According to one aspect of the present invention, one of the implementation methods of a mud-sand mixing and separation device of the present application is as follows: Figure 1 and Figure 2 As shown, it includes: a stirring tank 1, a mud and sand input pump 201, a clear liquid separation pump 5, a mud output pump 4 and a sand output pump 3.

[0046] The stirring tank 1 comprises a tank body and a stirring motor 101. The stirring motor 101 is connected to a rotating shaft 102, and a stirring blade 103 is arranged on the rotating shaft 102. The stirring motor 101 rotates the stirring blade 103 to form a circulation in the tank body. The stirring motor 101 is installed on the top of the stirring tank, the rotating shaft 102 is located in the middle of the cross section of the stirring tank 1, and one end of the rotating shaft 102 extends toward the bottom of the stirring tank 1.

[0047] The tank body comprises a cylindrical tank body, the lower end of which is connected with a conical bottom; the side surface of the tank body is provided with a first pipe opening, a second pipe opening and a third pipe opening in sequence from high to low.

[0048] Specifically, the bottom of the conical bottom is provided with a bottom surface, and a fourth pipe opening is provided on the bottom surface. The distance between the first pipe opening and the upper end surface of the can body is h2; the distance between the second pipe opening and the upper end surface of the can body is h3; the distance between the third pipe opening and the upper end surface of the can body is h1; the height of the second pipe opening is lower than that of the first pipe opening, that is, h3 is greater than h2; the third pipe opening is arranged at a position close to the lower end of the can body, that is, h1 is greater than h2. The height of the fourth pipe opening is lower than that of the third pipe opening.

[0049] The mud input pump 201 is connected to the first pipe port through the connected mud output pipe 202, the clear liquid separation pump 5 is connected to the second pipe port through the connected clear liquid input pipe 501, and the mud output pump 4 is connected to the third pipe port through the connected mud input pipe 401.

[0050] Specifically, the input end of the mud and sand input pump 201 is connected to a mud and sand input pipe 201, and the output end is connected to a mud and sand output pipe 202. The mud and sand input pump 201 inputs the first mud and sand mixture into the mixing tank 1 through the mud and sand output pipe 202.

[0051] The input end of the clear liquid separation pump 5 is connected to a clear liquid input pipe 501, and the output end is connected to a clear liquid output pipe 502. The second pipe port is connected to the clear liquid separation pump 5 through the clear liquid input pipe 501, and the clear liquid in the stirring tank 1 is output through the clear liquid separation pump 5 and the connected clear liquid output pipe 502.

[0052] The input end of the mud output pump 4 is connected to a mud input pipe 401, and the output end is connected to a mud output pipe 402. The third pipe port is connected to the mud output pump 4 through the mud input pipe 401, and the second mud-sand mixture in the mixing tank 1 is output through the mud output pump 4 and the connected mud output pipe 402.

[0053] The input end of the sand output pump 3 is connected to a sand input pipe 301, and the output end is connected to a sand output pipe 302. The fourth pipe port is connected to the sand output pump 3 through the sand input pipe 301, and outputs the third mud-sand mixture in the mixing tank 1 through the sand input pipe 301 and the connected sand output pipe 302.

[0054] The diameter of the particles in the third mud-sand mixture is greater than the diameter of the particles in the second mud-sand mixture.

[0055] Specifically, the particle size of the second mud-sand mixture is greater than 0.062 mm and less than or equal to 2.0 mm; the particle size of the third mud-sand mixture is greater than 2.0 mm.

[0056] The first mud-sand mixture in the dredging project contains a large amount of water and is in a flowing state as a whole. It contains mud particles with smaller particles (less than or equal to 0.062 mm) and sand particles with larger particle sizes (greater than 2 mm). It is easy to stratify when flowing. The sand particles with larger particles have a smaller specific surface area, and the coarse particles per unit mass are subjected to smaller viscous forces when moving in the fluid. Therefore, the coarse particles will sink to the bottom of the container. The first mud-sand mixture is stirred in the mixing tank 1 to form a stable laminar flow. The sand particles with larger particles will sink to the bottom of the mixing tank 1 (i.e., the bottom of the conical bottom). The middle part of the mixing tank 1 is the dredged mud that can be recycled (i.e., the second mud-sand mixture mentioned above), and the upper part of the mixing tank 1 is a clear liquid with less mud content. Mixtures with different water contents and gradations can be pumped at different depths of the mixing tank 1.

[0057] More specifically, the angle between the mud and sand output pipe 202 and the tangent of the tank body is less than 5 degrees. The first mud and sand mixture is input into the mixing tank 1 through the mud and sand input pump 2, and the angle between the longitudinal direction of the mud and sand output pipe 202 and the tangent of the mixing tank 1 is less than 5 degrees, which can prevent the mud and sand input pump 2 from outputting fluid to disturb the stable laminar flow formed in the mixing tank 1.

[0058] The clear liquid separation pump 5 is connected to the stirring tank 1 through the clear liquid input pipe 501, that is, after the clear liquid is extracted, the mud and water can be further separated after a short sedimentation, which is beneficial to improving the recovery rate of the dredged mud (that is, the above-mentioned second mud-sand mixture) by the mud output pump 4.

[0059] The sand output pump 3 is connected to the mixing tank 1 through the sand input pipe 302. During the mixing process, sand with larger particles will be deposited at the bottom of the mixing tank 1. The sand output pipe 302 is set at the bottom of the mixing tank 1, and the sand and water mixture with larger particles (i.e., the third mud-sand mixture mentioned above) can be directly extracted.

[0060] More specifically, the stirring direction of the stirring blade 103 is consistent with the direction in which the first mud-sand mixture is input into the stirring tank 1, so that the mixture in the stirring tank 1 is in a turbulent state. At the same time, the directions in which the clear liquid input pipe 501 and the mud input pipe 502 are output are consistent with the stirring direction of the stirring blade 102, so that when the clear liquid and the second mud-sand mixture are recovered, the turbulent state of the mixture in the stirring tank 1 is not affected.

[0061] More specifically, the radius r3 of the bottom of the mixing tank 1 (i.e., the bottom of the conical bottom) is smaller than the radius r2 of the tank body. The smaller the diameter of the bottom of the mixing tank 1, the smaller the flow rate of the liquid, and the faster sedimentation of the larger sand particles can be ensured. The mixing radius of the mixing blade 103 can be determined by the radius of the tank body of the mixing tank 1.

[0062] In an optional embodiment, the stirring tank 1 is a cylindrical tank body, and the ratio of the stirring radius r1 of the stirring blade 103 to the radius r2 of the tank body is between 1 / 3 and 2 / 3. If the ratio is less than 1 / 3, the mixture in the stirring tank 1 cannot form a circulation in the stirring tank 1, and if the ratio is greater than 2 / 3, turbulence will be formed in the stirring tank 1, and the separation of particles of different sizes will not be obvious.

[0063] More specifically, in the first mud-sand mixture input, the mass of particles with a particle size greater than 2.0 mm accounts for a1% of the mass of the total solid particles; the mass of particles with a particle size less than 0.062 mm accounts for a2% of the mass of the total solid particles; the flow rate of the sand output pump 3 is a1 times the flow rate of the mud-sand input pump; the flow rate of the clear liquid separation pump 5 is a2 times the flow rate of the mud-sand input pump. The sum of the flow rates of the clear liquid separation pump 5, the mud output pump 4 and the sand output pump 4 differs from the flow rate of the mud-sand input pump 2 by less than 5% of the flow rate of the mud-sand input pump.

[0064] By setting the flow rates of pumps with different functions, sand, mud and clear liquid can be separated from the mixing tank 1, and it is ensured that the pumps with different functions only suck in particles within a specific gradation range. When the gradation of mud and sand, the density of the particle components in the mixed liquid, and the dynamic viscosity coefficient of the mixed liquid are determined, the stirring speed can be determined according to the size of the mixing tank 1, and the flow rates of the mud-clear liquid separation pump 5, the mud output pump 4, and the sand output pump 3 can be determined according to the flow rate of the sand input pump, thereby achieving the stirring and separation of the mud-sand mixed liquid. Therefore, another aspect of the fundamental application also provides a mud-sand stirring and separation method, which is applied to the above-mentioned mud-sand stirring and separation device, and includes the following steps:

[0065] S1: Determine the gradation of each particle component in the first input mud-sand mixture, and determine the proportion a1 of the mass of particles with a particle size greater than 2.0 mm to the total mass of solid particles, and determine the proportion a2 of the mass of particles with a particle size less than or equal to 0.062 mm to the total mass of solid particles.

[0066] S2: According to the gradation of each particle component in the first mud-sand mixture and the size of the stirring tank 1, the working parameters of the stirring motor 101, the mud-sand input pump 2, the clear liquid separation pump 5, the mud output pump 4 and the sand output pump 3 are determined.

[0067] S3: according to the determined working parameters, the stirring motor 101, the mud and sand input pump 2, the clear liquid separation pump 5, the mud output pump 4, and the sand output pump 3 are started in sequence.

[0068] S4: Adjust the flow rates of the mud and sand input pump 2, the clear liquid separation pump 5, the mud output pump 4 and the sand output pump 4 respectively, so that the flow rate of the sand output pump 3 is a1 times the flow rate of the mud and sand input pump; the flow rate of the clear liquid separation pump 5 is a2 times the flow rate of the mud and sand input pump. The sum of the flow rates of the clear liquid separation pump 5, the mud output pump 4 and the sand output pump 4 differs from the flow rate of the mud and sand input pump 2 by less than 5% of the flow rate of the mud and sand input pump.

[0069] S5: Recover the clear liquid, the second mud-sand mixture (i.e. dredged mud) and the third mud-sand mixture (i.e. sand-water mixture) through the clear liquid output pipe 502, the mud output pipe 402 and the sand output pipe 302 respectively.

[0070] Specifically, step S2 also includes the following steps: calculating the range of the circulation velocity according to the particle size and sedimentation velocity of the particles, and determining the rotation speed of the stirring motor according to the range of the circulation velocity. The specific calculation is as follows:

[0071] In the mud-sand mixture in the mixing tank 1, the settling velocity formula of particles with a particle size greater than 2.0 mm is as shown in formula (1):

[0072]

[0073] Where: ω is the sedimentation velocity of particles with a diameter greater than 2.0 mm; the unit is cm / s;

[0074] ρ s is the density of mud and sand, in grams / cm 3 ;

[0075] ρ ω is the density of clean water, in grams / cm 3 ;

[0076] g Gravity acceleration, in cm / s 2 ;

[0077] D is the particle size in mm. When calculating using formula (1), the unit needs to be converted to cm.

[0078] In the mud-sand mixture in the mixing tank 1, the sedimentation velocity of particles with a particle size between 0.062 and 2.0 mm satisfies the relationship of formula (2):

[0079]

[0080] Where: ω is the settling velocity of particles with a diameter between 0.062 and 2.0 mm, in cm / s;

[0081] ρ s is the density of mud and sand, in grams / cm 3 ;

[0082] ρ ω is the density of clean water, in grams / cm 3 ;

[0083] g Gravity acceleration, in cm / s 2 ;

[0084] D is the particle size in mm. When calculating using formula (2), the unit needs to be converted to cm.

[0085] v is the kinematic viscosity of water, in cm 2 / s.

[0086] In the mud-sand mixture in the mixing tank 1, the settling velocity of particles with a particle size less than or equal to 0.062 mm is calculated as follows:

[0087]

[0088] Where: ω is the sedimentation velocity of particles with a particle size less than or equal to 0.062 mm, in cm / s;

[0089] ρ s is the density of mud and sand, in grams / cm 3;

[0090] ρ ω is the density of clean water, in grams / cm 3 ;

[0091] g Gravity acceleration, in cm / s 2 ;

[0092] D is the particle size in mm. When calculating using formula (3), the unit needs to be converted to cm;

[0093] v is the kinematic viscosity of water, in cm 2 / s.

[0094] In the circulation formed by the mud-sand mixture in the mixing tank, the mud-sand particles will gradually settle downwards, and the water with less mud-sand content will remain in the upper layer. In order to ensure that the particle size of the mud particles in the upper clear liquid output pump is less than or equal to 0.062mm, it is necessary to separate the mud particles less than or equal to 0.062mm from the mud particles larger than 0.062mm, that is, when the circulation drives the mud-sand particles from the first pipe mouth to the second pipe mouth in the horizontal direction, the 0.062mm mud particles need to settle below the second pipe mouth (the vertical settlement distance is greater than the distance from the second pipe mouth to the first pipe mouth, to ensure that the particles reaching the first pipe mouth are all mud particles with a particle size not exceeding 0.062mm). Therefore, formula (4-1) can be obtained.

[0095]

[0096] Wherein, A1 represents the ratio of the central angle formed by the first nozzle and the second nozzle to the angle of the corresponding circle.

[0097] Specifically, A1 can be set to 0.5 (i.e., the central angle formed in the horizontal direction is 180 degrees), formula (3) is substituted into formula (4-1), and D = 0.062 mm (i.e., 0.0062 cm), and the kinematic viscosity coefficient v of water is 0.01 cm 2 / s, g is 980cm / s 2 , we can use formula (4-1) to get the relationship between the circulation velocity V and h2, h3 that should satisfy formula (4-2):

[0098]

[0099] Wherein, r2 is the inner diameter of the stirring tank 1, in cm, and the unit of the circulation velocity V is cm / s;

[0100] ρ s is the density of mud and sand; ω is the density of clean water;

[0101] h2 is the distance between the first pipe opening and the upper end surface of the can body; h3 is the distance between the second pipe opening and the upper end surface of the can body.

[0102] In order to ensure that the sand particles with a diameter greater than 2 mm are deposited at the bottom of the mixing tank and then sucked away by the sand output pump, the circular flow that needs to be formed drives the particles to move from the first pipe opening to the third pipe opening in the horizontal direction. The vertical sedimentation distance of the sand particles with a diameter greater than 2 mm is greater than the distance between the first pipe opening and the third pipe opening to ensure that they will not enter the third pipe opening). Therefore, formula (5-1) can be obtained:

[0103]

[0104] Wherein, A2 represents the ratio of the central angle of the circle formed by the first nozzle and the third nozzle in the horizontal direction to the angle of the corresponding circle.

[0105] Specifically, A2 can be taken as 2 / 3 (i.e. the angle of the central angle formed is 240 degrees), formula (1) is substituted into formula (5-1), and D = 2 mm (i.e. 0.2 cm), g is 980 cm / s 2 , it can be obtained through formula (5-1) that the circulation velocity V and h1, h2 should also satisfy the relationship of formula (5-2):

[0106]

[0107] Wherein, r2 is the inner diameter of the mixing tank 1;

[0108] ρ s is the density of mud and sand; ω is the density of clean water;

[0109] h1 is the distance between the third pipe opening and the upper end surface of the tank body; h2 is the distance between the first pipe opening and the upper end surface of the tank body.

[0110] Therefore, the circulation velocity V should satisfy as well as

[0111] Among them, ρ s is the density of mud and sand; ω is the density of clean water; r2 is the inner diameter of the mixing tank 1;

[0112] h1 is the distance between the third pipe opening and the upper edge of the mixing tank;

[0113] h2 is the distance between the first pipe opening and the upper edge of the mixing tank;

[0114] h3 is the distance between the second pipe opening and the upper edge of the stirring tank.

[0115] Furthermore, when the inner diameter r2 of the stirring tank is determined, the average angular velocity of the stirring blade is: ω 叶片 The unit is rad / s.

[0116] Note that the above are only preferred embodiments of the present application and the technical principles used. Those skilled in the art will understand that the present application is not limited to the specific embodiments described herein, and that various obvious changes, readjustments and substitutions can be made by those skilled in the art without departing from the scope of protection of the present application. Therefore, although the present application is described in more detail through the above embodiments, the present application is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of the present application, and the scope of the present application is determined by the scope of the appended claims.

Claims

1. A mud and sand mixing and separation device, It is characterized in that include: Mixing tank, mud and sand input pump, clear liquid separation pump, mud output pump and sand output pump; The stirring tank comprises a tank body and a stirring motor, wherein the stirring motor is connected with a stirring blade, and a circulation is formed in the tank body by rotating the stirring blade; The tank body comprises a cylindrical tank body, the lower end of which is connected to a conical bottom; the side of the tank body is provided with a first pipe opening, a second pipe opening and a third pipe opening in sequence from high to low; The mud and sand input pump is connected to the first pipe port through the connected mud and sand output pipe, the clear liquid separation pump is connected to the second pipe port through the connected clear liquid input pipe, and the mud output pump is connected to the third pipe port through the connected mud input pipe; The bottom of the conical bottom is connected to the sand output pump through a sand input pipe; The mud and sand input pump is used to input the first mud and sand mixture into the mixing tank; the mixing tank is used to separate the clear liquid, the second mud and sand mixture and the third mud and sand mixture in the first mud and sand mixture by utilizing the circulation; the clear liquid separation pump is used to output the clear liquid; the mud output pump is used to output the second mud and sand mixture; the sand output pump is used to output the third mud and sand mixture; wherein the particle diameter of the third mud and sand mixture is greater than the particle diameter of the second mud and sand mixture.

2. A mud-sand stirring and separating device according to claim 1, Features: The particle size of the second mud-sand mixture is greater than 0.062 mm and less than or equal to 2.0 mm; The particle size of the third mud-sand mixture is greater than 2.0 mm.

3. A mud-sand stirring and separating device according to claim 2, Features: In the first mud-sand mixture input, the mass of particles with a particle size greater than 2.0 mm accounts for the proportion of the total solid particle mass a 1 ; The proportion of the mass of particles with a particle size less than 0.062 mm to the total mass of solid particles 2 ; The flow rate of the sand output pump is a 1 Times the flow rate of mud and sand input pump; The flow rate of the clear liquid separation pump is a 2 Times the flow rate of mud and sand input pump.

4. A mud-sand stirring and separating device according to claim 3, Features: The angle between the mud and sand output pipe and the tangent direction of the tank body is less than 5 degrees; The difference between the sum of the flow rates of the clear liquid separation pump, the mud output pump and the sand output pump and the flow rate of the mud and sand input pump is less than 5% of the flow rate of the mud and sand input pump.

5. A mud-sand stirring and separating device according to any one of claims 1 to 4, Features: The ratio of the stirring radius of the stirring blade to the radius of the can body is between 1 / 3 and 2 / 3.

6. A mud-sand stirring and separating device according to claim 5, Features: The stirring direction of the stirring blade is consistent with the direction in which the first mud-sand mixture is input into the stirring tank; The output directions of the clear liquid input pipe and the mud input pipe are consistent with the stirring direction of the stirring blade.

7. A mud-sand stirring and separation method, applied to a mud-sand stirring and separation device as claimed in any one of claims 1 to 6, It is characterized in that The following steps are involved: S1: Determine the gradation of each particle component in the first mud-sand mixture input, and determine the proportion of the mass of particles with a particle size greater than 2.0 mm to the total mass of solid particles. 1 , and determine the proportion of the mass of particles with a particle size less than or equal to 0.062 mm to the total mass of solid particles. 2 ; S2: Determine the working parameters of the stirring motor, the mud and sand input pump, the clear liquid separation pump, the mud output pump and the sand output pump according to the gradation of each particle component in the first mud and sand mixture and the size of the stirring tank; S3: starting the stirring motor, the mud and sand input pump, the clear liquid separation pump, the mud output pump, and the sand output pump in sequence according to the determined working parameters; S4: Adjust the flow rates corresponding to the mud and sand input pump, the clear liquid separation pump, the mud output pump and the sand output pump respectively, so that the sum of the flow rates of the clear liquid separation pump, the mud output pump and the sand output pump differs from the flow rate of the mud and sand input pump by less than 5% of the flow rate of the mud and sand input pump.

8. A mud-sand stirring and separation method according to claim 7, Features: The step S2 also includes the following steps: calculating the range of the circulation velocity according to the particle size and sedimentation velocity of the particles, and determining the rotation speed of the stirring motor according to the range of the circulation velocity.

9. A mud-sand stirring separation method according to claim 8, Features: The circulation speed The circulation speed Among them, ρ s is the density of mud and sand; ω is the density of clean water; r 2 is the inner diameter of the mixing tank; h 1 is the distance between the third pipe opening and the upper edge of the stirring tank; h 2 is the distance between the first pipe opening and the upper edge of the mixing tank; h 3 is the distance between the second pipe opening and the upper edge of the stirring tank.

10. A mud-sand stirring and separation method according to claim 9, Features: The average angular velocity of the stirring blade is:

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