CN117357939A - Mud and sand stirring and separating device and separating method - Google Patents
Mud and sand stirring and separating device and separating method Download PDFInfo
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- CN117357939A CN117357939A CN202311602658.5A CN202311602658A CN117357939A CN 117357939 A CN117357939 A CN 117357939A CN 202311602658 A CN202311602658 A CN 202311602658A CN 117357939 A CN117357939 A CN 117357939A
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- 238000003756 stirring Methods 0.000 title claims abstract description 136
- 239000004576 sand Substances 0.000 title claims abstract description 113
- 238000000034 method Methods 0.000 title claims abstract description 26
- 239000002245 particle Substances 0.000 claims abstract description 104
- 239000007788 liquid Substances 0.000 claims abstract description 55
- 238000000926 separation method Methods 0.000 claims abstract description 42
- 239000002002 slurry Substances 0.000 claims abstract description 38
- 239000000203 mixture Substances 0.000 claims description 59
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 25
- 239000007787 solid Substances 0.000 claims description 12
- 239000013049 sediment Substances 0.000 claims description 10
- 238000013019 agitation Methods 0.000 claims description 6
- 238000002156 mixing Methods 0.000 claims description 6
- 238000005516 engineering process Methods 0.000 abstract description 4
- 238000012216 screening Methods 0.000 abstract description 4
- 238000004062 sedimentation Methods 0.000 description 8
- 239000006228 supernatant Substances 0.000 description 8
- 239000012530 fluid Substances 0.000 description 6
- 239000011259 mixed solution Substances 0.000 description 6
- 239000011362 coarse particle Substances 0.000 description 4
- 230000001133 acceleration Effects 0.000 description 3
- 230000005484 gravity Effects 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 2
- 230000008021 deposition Effects 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- 241000195493 Cryptophyta Species 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 1
- 239000005442 atmospheric precipitation Substances 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 238000001311 chemical methods and process Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000000084 colloidal system Substances 0.000 description 1
- 238000010668 complexation reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 239000003864 humus Substances 0.000 description 1
- 239000010842 industrial wastewater Substances 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 239000011499 joint compound Substances 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 235000003715 nutritional status Nutrition 0.000 description 1
- 239000010815 organic waste Substances 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 239000011591 potassium Substances 0.000 description 1
- 229910052700 potassium Inorganic materials 0.000 description 1
- 230000008707 rearrangement Effects 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 239000010802 sludge Substances 0.000 description 1
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D21/00—Separation of suspended solid particles from liquids by sedimentation
- B01D21/28—Mechanical auxiliary equipment for acceleration of sedimentation, e.g. by vibrators or the like
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D21/00—Separation of suspended solid particles from liquids by sedimentation
- B01D21/24—Feed or discharge mechanisms for settling tanks
- B01D21/245—Discharge mechanisms for the sediments
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Separation Of Solids By Using Liquids Or Pneumatic Power (AREA)
Abstract
The application discloses silt particle stirring separator includes: a stirring tank, a mud and 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 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 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 device utilizes the layering characteristics of particles with different particle sizes in the slurry stirring process, clear liquid, slurry and sand which are discharged from different depth positions in the stirring tank are respectively extracted, so that the rapid separation of the slurry and sand is realized, namely, the slurry and sand with different particle diameters can be separated without using a vibration screening technology, the complexity of equipment is effectively reduced, and the efficiency of separating the slurry and sand is effectively improved.
Description
Technical Field
The application relates to the technical field of geotechnical engineering, in particular to a mud and sand stirring and separating device and a separating method.
Background
Dredging mud is a mud-water mixture produced by dredging sediment of water bodies such as rivers, lakes, shallow sea and the like, and is formed by the fact that after industrial wastewater, domestic sewage, urban surface runoff, atmospheric precipitation and the like enter the water bodies, particulate matters, colloid matters and water-soluble salts in the mud-water mixture are subjected to physical and chemical processes such as adsorption, complexation, chemical reaction and the like, and are deposited at the bottom of the water bodies under certain hydraulic conditions, so that sediment is formed.
The physical and chemical composition of dredging mud is obviously different from that of land soft soil. In terms of physical properties, dredging mud is usually composed of fine granular materials, with different particle sizes, mainly including sand, mud, sand, powdery materials and the like; in terms of chemical component methods, dredging mud contains rich organic matters and inorganic matters, wherein the organic matters mainly come from suspended matters in water bodies and deposition of organic wastes, including plant residues, algae, humus and the like, and the inorganic matters mainly come from dissolved matters in water bodies and inorganic salts and minerals in the deposits, including nitrogen, phosphorus, potassium, calcium, magnesium and the like. These chemical components have a certain influence on the nutritional status and the ecological environment of the water body, and therefore need to be properly treated and disposed of in the dredging sludge process.
At present, how to quickly recycle the dredging mud is a great difficulty in the dredging industry. Because the water content of the dredging mud is high, the dredging mud is in a flowing state, the grain size distribution is wide (the maximum grain size can reach 5 cm), and the coarse and fine grains of the dredging mud must be separated first for quick recycling of the dredging mud. At present, the treatment of the dredged mud is to firstly perform vibration screening on the dredged mud from a drag suction, a cutter suction or a grab bucket and then perform the next treatment after separating coarse particles and fine particles in the dredged mud, but the conventional vibration screening technology has complex equipment, high power consumption and easy hole plugging, and a more efficient and simple mud-sand separation technology must be developed.
Disclosure of Invention
The invention aims to avoid the defects in the prior art and provides a mud-sand stirring and separating device and a separating method.
The aim of the invention is achieved by the following technical scheme:
according to an aspect of the present invention, there is provided a silt stirring and separating apparatus comprising: a stirring tank, a mud and 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 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 tank body is provided with a first pipe orifice, a second pipe orifice and a third pipe orifice; the mud sand input pump, the clear liquid separation pump and the mud output pump are respectively connected with the first pipe orifice, the second pipe orifice and the third pipe orifice through the mud sand output pipe, the clear liquid input pump and the mud input pump which are connected; the bottom of the conical bottom is connected with a sand output pump through a sand input pipe; the silt input pump is used for inputting the first silt mixture into the stirring tank; the clear liquid separation pump is used for outputting clear liquid; the mud output pump is used for outputting a second mud-sand mixture; the sand output pump is used for outputting a third silt mixture; wherein the particle diameter of the third silt mixture is greater than the particle diameter of the second silt mixture; the height of the second pipe orifice is higher than that of the first pipe orifice; the third pipe orifice is arranged at the position close to the lower end of the tank body.
Specifically, the particle size of the second silt mixture is more than or equal to 0.062mm and less than or equal to 2.0mm; the particle size of the third silt mixture is larger than 2.0mm.
More specifically, in the input first silt mixture, the proportion a of the mass of particles with the particle diameter of more than 2.0mm to the mass of the total solid particles 1 The method comprises the steps of carrying out a first treatment on the surface of the The proportion a of the mass of the particles with the particle diameter of less than 0.062mm to the mass of the total solid particles 2 The method comprises the steps of carrying out a first treatment on the surface of the The flow rate of the sand output pump is a 1 The flow of the silt is input into the pump; the flow rate of the clear liquid separation pump is a 2 The flow of the silt is input into the pump.
More specifically, the included angle between the mud and sand output pipe and the tangential direction of the tank body is smaller than 5 degrees; the sum of the flow rates of the clear liquid separation pump, the slurry output pump and the sand output pump is different from the flow rate of the mud sand input pump by less than 5 percent.
The ratio of the stirring radius of the stirring blade to the radius of the tank body is 1/3 to 2/3.
Further, the stirring direction of the stirring blade is consistent with the direction of inputting the first muddy sand mixture into the stirring tank; the output directions of the clear liquid input pipe and the slurry input pipe are consistent with the stirring directions of the stirring blades.
According to another aspect of the present application, there is also provided a method for stirring and separating muddy sand, which is applied to the muddy sand stirring and separating device, and includes the following steps:
s1: determining the grading of each particle component in the input first silt mixture, and determining the proportion a of the mass of particles with the particle diameter of more than 2.0mm to the mass of the total solid particles 1 And determining the ratio a of the mass of particles with the particle diameter of less than 0.062mm to the mass of the total solid particles 2 ；
S2: according to the grading of each particle component in the first silt mixture and the size of the stirring tank, working parameters of a stirring motor, a silt input pump, a clear liquid separation pump, a mud output pump and a sand output pump are determined;
s3: sequentially starting a stirring motor, a silt input pump, a clear liquid separation pump, a mud output pump and a sand output pump according to the determined working parameters;
s4: and adjusting the flow rates corresponding to the mud sand input pump, the clear liquid separation pump, the slurry output pump and the sand output pump respectively, so that the difference between the sum of the flow rates of the clear liquid separation pump, the slurry output pump and the sand output pump and the flow rate of the mud sand input pump is less than 5 percent of the flow rate of the mud sand input pump.
Specifically, step S2 further includes the following steps: the range of the circulation speed is calculated, and the rotation speed of the stirring motor is determined according to the range of the circulation speed.
More specifically, the circulation velocityAnd circulation speed +.>
Wherein ρ is s Is the sediment density; ρ ω The density of the clean water is the density; r is (r) 2 Is the inner diameter of the stirring tank;
h 1 is the distance between the third pipe orifice and the upper edge of the stirring tank;
h 2 is the distance between the first pipe orifice and the upper edge of the stirring tank;
h 3 is the distance between the second nozzle and the upper edge of the agitator tank.
More specifically, the average angular velocity of the stirring blade is:
the invention has the beneficial effects that: a silt mixing and separating apparatus comprising: a stirring tank, a mud and 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 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 tank body is provided with a first pipe orifice, a second pipe orifice and a third pipe orifice; the mud sand input pump, the clear liquid separation pump and the mud output pump are respectively connected with the first pipe orifice, the second pipe orifice and the third pipe orifice through the mud sand output pipe, the clear liquid input pump and the mud input pump which are connected; the bottom of the conical bottom is connected with a sand output pump through a sand input pipe; the silt input pump is used for inputting the first silt mixture into the stirring tank; the clear liquid separation pump is used for outputting clear liquid; the mud output pump is used for outputting a second mud-sand mixture; the sand output pump is used for outputting a third silt mixture; wherein the particle diameter of the third silt mixture is greater than the particle diameter of the second silt mixture; the height of the second pipe orifice is higher than that of the first pipe orifice; the third pipe orifice is arranged at the position close to the lower end of the tank body; according to the technical scheme, clear liquid, slurry and sand which are discharged from different depth positions in the stirring tank are respectively extracted by utilizing the layering characteristics of particles with different particle sizes in the slurry stirring process, so that the rapid separation of the slurry and sand is realized, namely, the slurry and sand with different particle diameters can be separated without using a vibration screening technology, the complexity of equipment is effectively reduced, and the efficiency of separating the slurry and sand is effectively improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic view of the overall structure of a silt mixing and separating apparatus according to an embodiment of the present application;
FIG. 2 is a schematic top view of a silt mixing and separating apparatus according to an embodiment of the present application;
FIG. 3 is a schematic flow chart of a method of stirring and separating silt according to an embodiment of the present application;
in fig. 1 to 2, the method includes:
1. a stirring tank; 101. a stirring motor; 102. a rotating shaft; 103. stirring blades;
2. inputting mud and sand into a pump; 201. a silt input pipe; 202. a silt output pipe;
3. a sand output pump; 301. a sand input pipe; 302. a sand output pipe;
4. a slurry output pump; 401. a slurry input pipe; 402. a slurry output pipe;
5. a clear liquid separation pump; 501. a clear liquid input pipe; 502. and outputting clear liquid.
Detailed Description
For the purposes of making the objects, technical solutions and advantages of the present application more clear, the technical solutions of the present application will be clearly and completely described by implementation with reference to the accompanying drawings in the examples of the present application, and it is apparent that the described examples are some, but not all, examples of the present application. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.
Example 1
According to one aspect of the present invention, one of the methods for implementing the silt stirring and separating apparatus of the present application, as shown in fig. 1 and 2, comprises: a stirring tank 1, a silt input pump 201, a clear liquid separation pump 5, a mud output pump 4 and a sand output pump 3.
The stirring tank 1 comprises a tank body and a stirring motor 101, wherein the stirring motor 101 is connected with a rotating shaft 102 in a shaft way, and stirring blades 103 are arranged on the rotating shaft 102; a circulation is formed in the tank by rotating the stirring blade 103 by the stirring motor 101.
The tank body comprises a cylindrical tank body, and the lower end of the tank body is connected with a conical bottom; the tank body is provided with a first pipe orifice, a second pipe orifice and a third pipe orifice. Specifically, the bottom of the conical bottom is provided with a bottom surface, and a fourth pipe orifice is arranged on the bottom surface. Wherein the distance between the first pipe orifice and the end face of the tank body is h 2 The method comprises the steps of carrying out a first treatment on the surface of the The distance between the second pipe orifice and the end face of the tank body is h 3 The method comprises the steps of carrying out a first treatment on the surface of the The distance between the third pipe orifice and the end face of the tank body is h 1 The method comprises the steps of carrying out a first treatment on the surface of the The second nozzle has a higher height than the first nozzle, i.e. h 3 Less than h 2 The method comprises the steps of carrying out a first treatment on the surface of the The third pipe orifice is arranged at the position close to the lower end of the tank body, namely h 1 Is greater than h 2 。
The input end of the silt input pump 201 is connected with a silt input pipe 201, and the output end is connected with a silt output pipe 202. The silt input pump 201 inputs the first silt mixture into the agitation tank 1 through the silt output pipe 202.
The input end of the clear liquid separation pump 5 is connected with a clear liquid input pipe 501, and the output end is connected with a clear liquid output pipe 502. The second nozzle is connected to the supernatant separation pump 5 through the supernatant input pipe 501, and the supernatant in the agitation tank 1 is output through the supernatant separation pump 5 and the connected supernatant output pipe 502.
The slurry output pump 4 has an input end connected to a slurry input pipe 401 and an output end connected to a slurry output pipe 402. The third pipe orifice is connected to the slurry outlet pump 4 through the slurry inlet pipe 401, and the second silt mixture in the agitation tank 1 is output through the slurry outlet pump 4 and the connected slurry outlet pipe 402.
The sand output pump 3 has an input end connected to a sand input pipe 301 and an output end 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 the third muddy sand mixture in the agitation tank 1 is output through the sand input pipe 301 and the connected sand output pipe 302.
Wherein the particle diameter of the third silt mixture is larger than the particle diameter of the second silt mixture.
Specifically, the particle size of the second silt mixture is more than or equal to 0.062mm and less than or equal to 2.0mm; the particle size of the third silt mixture is larger than 2.0mm.
The first silt mixture in dredging engineering contains a large amount of water, and the whole of the first silt mixture is in a flowing state, wherein the first silt mixture contains silt particles with smaller particles (smaller than 0.062 mm) and sand particles with larger particle sizes (larger than 2 mm), layering easily occurs when the first silt mixture flows, the viscous force applied to coarse particles with larger particles in unit mass when the coarse particles move in fluid is smaller due to the small specific surface area, and therefore the coarse particles sink to the bottom of a container. The first silt mixture is stirred in the stirring tank 1 to form a stable laminar flow, larger sand particles sink to the bottom of the stirring tank 1 (namely, the bottom of the conical bottom), the middle part of the stirring tank 1 is the dredging mud (namely, the second silt mixture) which can be recycled, and the upper part of the stirring tank 1 is clear liquid with less mud content. The mixture of different water contents and gradations can be pumped at different depths of the stirred tank 1.
More specifically, the included angle between the mud and sand output pipe 202 and the tangential direction of the tank body is less than 5 degrees. The first silt mixture is input into the stirring tank 1 through the silt input pump 2, and the included angle between the longitudinal direction of the silt output pipe 202 and the tangential direction of the stirring tank 1 is smaller than 5 degrees, so that the output fluid of the silt input pump 2 can be prevented from disturbing the stable laminar flow formed in the stirring tank 1.
The clear liquid separation pump 5 is connected with the stirring tank 1 through the clear liquid input pipe 501, namely, the clear liquid can be further separated from mud water through short sedimentation after being pumped out, which is beneficial to improving the recycling rate of the mud output pump 4 to the dredging mud (namely, the second mud sand mixture).
The sand output pump 3 is connected with the stirring tank 1 through the sand input pipe 302, during the stirring process, the sand with larger particles can be deposited at the bottom of the stirring tank 1, and the sand output pipe 302 is arranged at the bottom of the stirring tank 1, so that most of the sand and water mixture with larger particles (namely the third silt mixture) can be directly pumped out.
More specifically, the stirring direction of the stirring blade 103 coincides with the direction in which the first muddy sand mixture is fed into the stirring tank 1; the mixture in the stirring tank 1 is caused to assume a turbulent state. Meanwhile, the directions of the output of the supernatant fluid input pipe 501 and the slurry input pipe 502 are identical to the stirring direction of the stirring blade 102, so that the turbulent state of the mixture in the stirring tank 1 is not affected when the mixture of the supernatant fluid and the second muddy sand is recovered.
More specifically, the radius r of the bottom of the stirring tank 1 (i.e., the bottom of the conical bottom) 3 Smaller than the radius r of the tank body 2 The diameter of the bottom of the stirring tank 1 is smaller, the flow velocity of liquid is smaller, and rapid deposition of sand particles with larger particles can be ensured.
In an alternative embodiment, the stirring radius r of the stirring blade 103 1 Radius r with can body 2 The ratio of (2) is between 1/3 and 2/3. Wherein, if the stirring radius r of the stirring blade 103 is 1 Too small a size will result in the mixture in the stirred tank 1 not forming a circulation in the stirred tank 1 and too long a radius of the stirring vanes 103 will result in turbulence in the stirred tank 1, the sorting of particles of different sizes being not obvious.
More specifically, in the input first silt mixture, the proportion a of the mass of particles with the particle diameter of more than 2.0mm to the mass of the total solid particles 1 The method comprises the steps of carrying out a first treatment on the surface of the The proportion a of the mass of the particles with the particle diameter of less than 0.062mm to the mass of the total solid particles 2 The method comprises the steps of carrying out a first treatment on the surface of the The flow rate of the sand output pump 3 is a 1 The flow of the silt is input into the pump; the flow rate of the clear liquid separation pump 5 is a 2 The flow of the silt is input into the pump. The sum of the flow rates of the clear liquid separation pump 5, the slurry output pump 4 and the sand output pump 4 differs from the flow rate of the silt input pump 2 by less than 5% of the flow rate of the silt input pump.
By setting the flow of the pumps with different functions, sand, slurry and clear liquid are separated from the stirring tank 1, and the pumps with different functions are ensured to only suck particles with specific grading ranges. When the gradation of the muddy sand is determined, the density of the particle components in the mixed solution and the dynamic viscosity coefficient of the mixed solution can be determined, the stirring rotation speed can be determined according to the size of the stirring tank 1, and the flow of the mud-clear liquid separating pump 5, the mud output pump 4 and the sand output pump 3 can be determined according to the flow of the sand input pump, so that the stirring separation of the muddy sand mixed solution is realized. Therefore, another aspect of the present application further provides a method for stirring and separating silt, which is applied to the above-mentioned silt stirring and separating apparatus, and includes the following steps:
s1: determining the grading of each particle component in the input first silt mixture, and determining the proportion a of the mass of particles with the particle diameter of more than 2.0mm to the mass of the total solid particles 1 And determining the ratio a of the mass of particles with the particle diameter of less than 0.062mm to the mass of the total solid particles 2 。
S2: the operating parameters of the stirring motor 101, the silt input pump 2, the clear liquid separation pump 5, the silt output pump 4 and the sand output pump 3 are determined according to the gradation of each particle component in the first silt mixture and the size of the stirring tank 1.
S3: the stirring motor 101, the silt input pump 2, the clear liquid separation pump 5, the mud output pump 4 and the sand output pump 3 are sequentially started according to the determined working parameters.
S4: the flow rates corresponding to the silt input pump 2, the clear liquid separation pump 5, the slurry output pump 4 and the sand output pump 4 are adjusted so that the flow rate of the sand output pump 3 is a1 time that of the silt input pump; the flow rate of the clear liquid separation pump 5 is a2 times that of the silt sand input pump. The sum of the flow rates of the clear liquid separation pump 5, the slurry output pump 4 and the sand output pump 4 differs from the flow rate of the silt input pump 2 by less than 5% of the flow rate of the silt input pump.
S5: clear fluid, a second silt mixture (i.e., dredged mud) and a third silt mixture (i.e., a sand, water mixture) are recovered through clear fluid output pipe 502, mud output pipe 402 and sand output pipe 302, respectively.
Specifically, step S2 further includes the following steps: the range of the circulation speed is calculated, and the rotation speed of the stirring motor is determined according to the range of the circulation speed. The specific calculation is as follows:
in the silt mixed solution in the stirring tank 1, the components with the particle size larger than 2.0mm are contained, and the sedimentation speed formula of the particles is shown as the formula (1):
wherein: omega is the sedimentation velocity of particles having a particle size greater than 2.0mm; the unit is cm/s;
ρ s is the sediment density;
ρ ω the density of the clean water is the density;
g gravity acceleration cm 3 /s；
D is the particle diameter of the particles.
In the silt mixed solution in the stirring tank 1, the particle size is 0.062 to 2.0mm, and the sedimentation speed satisfies the relation of the formula (2)
Wherein: omega is the sedimentation velocity of particles with the particle diameter of 0.062 to 2.0mm, and the unit is cm/s;
ρ s is the sediment density;
ρ ω the density of the clean water is the density;
g gravity acceleration cm 3 /s；
D is the particle size of the particles;
v is the kinematic viscosity coefficient of water.
In the silt mixed liquid in the stirring tank 1, the sedimentation velocity calculation formula is shown as the formula (3), wherein the particle size of the particles is smaller than 0.062 mm:
wherein: omega is the sedimentation velocity of particles with the particle size smaller than 0.062mm, and the unit is cm/s;
ρ s is the sediment density;
ρ ω the density of the clean water is the density;
g gravity acceleration cm 3 /s；
D is the particle size of the particles;
v is the kinematic viscosity coefficient of water.
In the circulation of the silt mixed solution in the stirring tank, silt particles gradually deposit downwards, and water with low silt content is left on the upper layer. In order to ensure that the particle size of slurry particles in the supernatant output pump is less than 0.062mm, the slurry circulation speeds V and h 2 、h 3 The relation of the formula (4) should be satisfied:
wherein r is 2 Is the inner diameter of the stirring tank 1;
ρ s is the sediment density; ρ ω The density of the clean water is the density;
h 2 is the distance between the first pipe orifice and the end face of the tank body; h is a 3 Is the distance between the second pipe orifice and the end face of the tank body.
In order to ensure that sand particles with the particle size of more than 2mm are deposited at the bottom of the stirring tank and are sucked by the sand output pump, the particles with the particle size of more than 2mm are required to be in 2 pi r from entering the stirring tank 2 Sedimentation exceeds h in time/(3ω) 1 -h 2 Thus, the mud circulation velocities V and h 2 、h 3 The relation of formula (5) should also be satisfied:
wherein r is 2 Is the inner diameter of the stirring tank 1;
ρ s is the sediment density; ρ ω The density of the clean water is the density;
h 1 is the distance between the third pipe orifice and the end face of the tank body; h is a 2 Is the distance between the first pipe orifice and the end face of the tank body.
Therefore, the circulation velocity should be satisfiedAt the same time satisfy the circulation velocity
Wherein ρ is s Is the sediment density; ρ ω The density of the clean water is the density; r is (r) 2 Is the inner diameter of the stirring tank 1;
h 1 is the distance between the third pipe orifice and the upper edge of the stirring tank;
h 2 is the distance between the first pipe orifice and the upper edge of the stirring tank;
h 3 is the distance between the second nozzle and the upper edge of the agitator tank.
Further, when the inner diameter r of the stirring tank is 2 After the determination, the average angular velocity of the stirring blade was:
note that the above is only a preferred embodiment of the present application and the technical principle applied. Those skilled in the art will appreciate that the present application is not limited to the particular embodiments described herein, but is capable of numerous obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the present application. Therefore, while the present application has been described in connection with the above embodiments, the present application is not limited to the above embodiments, but may include many other equivalent embodiments without departing from the spirit of the present application, the scope of which is defined by the scope of the appended claims.
Claims (10)
1. A silt particle stirring and separating device, comprising: a stirring tank, a mud and 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, wherein 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 tank body is provided with a first pipe orifice, a second pipe orifice and a third pipe orifice;
the mud sand input pump, the clear liquid separation pump and the slurry output pump are respectively connected with the first pipe orifice, the second pipe orifice and the third pipe orifice through a mud sand output pipe, a clear liquid input pipe and a slurry input pipe which are connected;
the bottom of the conical bottom is connected with the sand output pump through a sand input pipe;
the silt input pump is used for inputting a first silt mixture into the stirring tank; the clear liquid separation pump is used for outputting clear liquid; the slurry output pump is used for outputting a second silt mixture; the sand output pump is used for outputting a third silt mixture; wherein the particle diameter of the third silt mixture is greater than the particle diameter of the second silt mixture;
the second pipe orifice is higher than the first pipe orifice; the third pipe orifice is arranged at the position close to the lower end of the tank body.
2. The silt particle agitation and separation apparatus of claim 1 wherein:
the particle size of the second silt mixture is more than or equal to 0.062mm and less than or equal to 2.0mm;
the particle size of the third muddy sand mixture is larger than 2.0mm.
3. A silt mixing and separating apparatus according to claim 2 wherein:
in the first silt mixture, the proportion a of the mass of the particles with the particle diameter of more than 2.0mm to the mass of the total solid particles 1 ；
The proportion a of the mass of the particles with the particle diameter of less than 0.062mm to the mass of the total solid particles 2 ；
The flow rate of the sand output pump is a 1 The flow of the silt is input into the pump;
the flow rate of the clear liquid separation pump is a 2 The flow of the silt is input into the pump.
4. A silt mixing and separating apparatus according to claim 3 wherein:
the included angle between the mud sand output pipe and the tangential direction of the tank body is smaller than 5 degrees;
the sum of the flow rates of the clear liquid separation pump, the slurry output pump and the sand output pump is different from the flow rate of the mud sand input pump by less than 5 percent.
5. A silt particle agitation separation apparatus according to any one of claims 1 to 4 wherein:
the ratio of the stirring radius of the stirring blade to the radius of the tank body is 1/3 to 2/3.
6. The silt mixing and separating apparatus of claim 5 wherein:
the stirring direction of the stirring blade is consistent with the direction of inputting the first silt mixture into the stirring tank;
the output directions of the clear liquid input pipe and the slurry input pipe are consistent with the stirring directions of the stirring blades.
7. A method for stirring and separating muddy sand, which is applied to the muddy sand stirring and separating device according to any one of claims 1 to 6, and is characterized by comprising the following steps:
s1: determining the grading of each particle component in the input first silt mixture, and determining the proportion a of the mass of particles with the particle diameter of more than 2.0mm to the mass of the total solid particles 1 And determining the ratio a of the mass of particles with the particle diameter of less than 0.062mm to the mass of the total solid particles 2 ；
S2: according to the grading of each particle component in the first silt mixture and the size of the stirring tank, working parameters of a stirring motor, a silt input pump, a clear liquid separation pump, a mud output pump and a sand output pump are determined;
s3: sequentially starting the stirring motor, the silt input pump, the clear liquid separation pump, the mud output pump and the sand output pump according to the determined working parameters;
s4: and adjusting the flow rates corresponding to the silt input pump, the clear liquid separation pump, the slurry output pump and the sand output pump respectively, so that the difference between the sum of the flow rates of the clear liquid separation pump, the slurry output pump and the sand output pump and the flow rate of the silt input pump is less than 5% of the flow rate of the silt input pump.
8. The method for stirring and separating the muddy sand according to claim 7, which is characterized in that:
the step S2 further includes the steps of: and calculating the range of the circulation speed, and determining the rotating speed of the stirring motor according to the range of the circulation speed.
9. The method for stirring and separating the muddy sand according to claim 8, which is characterized in that:
the circulation velocityAnd circulation speed +.>
Wherein ρ is s Is the sediment density; ρ ω The density of the clean water is the density; r is (r) 2 Is the inner diameter of the stirring tank;
h 1 is the distance between the third nozzle and the upper edge of the stirring tank;
h 2 is the distance between the first nozzle and the upper edge of the stirring tank;
h 3 is the distance between the second nozzle and the upper edge of the agitator tank.
10. The method for stirring and separating the muddy sand according to claim 9, characterized in that:
the average angular velocity of the stirring blade is as follows:
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