CN111551467A - Method for measuring and calculating scouring pollution amount of deposited particles - Google Patents
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- 239000002245 particle Substances 0.000 title claims abstract description 208
- 238000009991 scouring Methods 0.000 title claims abstract description 43
- 238000000034 method Methods 0.000 title claims abstract description 28
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 75
- 239000013049 sediment Substances 0.000 claims abstract description 50
- 238000005070 sampling Methods 0.000 claims abstract description 38
- 238000012360 testing method Methods 0.000 claims abstract description 14
- 238000005303 weighing Methods 0.000 claims abstract description 11
- 238000004088 simulation Methods 0.000 claims abstract description 7
- 238000001035 drying Methods 0.000 claims abstract description 6
- 239000011248 coating agent Substances 0.000 claims abstract description 3
- 238000000576 coating method Methods 0.000 claims abstract description 3
- 238000002156 mixing Methods 0.000 claims abstract description 3
- 230000008021 deposition Effects 0.000 claims description 41
- 239000008188 pellet Substances 0.000 claims description 5
- 230000003628 erosive effect Effects 0.000 claims description 3
- 239000011521 glass Substances 0.000 claims description 3
- 238000011109 contamination Methods 0.000 claims 2
- 238000011010 flushing procedure Methods 0.000 abstract description 6
- 239000000203 mixture Substances 0.000 abstract description 3
- 238000013508 migration Methods 0.000 description 12
- 230000005012 migration Effects 0.000 description 12
- 230000006870 function Effects 0.000 description 9
- 239000008187 granular material Substances 0.000 description 3
- 238000013178 mathematical model Methods 0.000 description 3
- 238000005406 washing Methods 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000012216 screening Methods 0.000 description 2
- 239000010865 sewage Substances 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 238000012935 Averaging Methods 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 238000012018 process simulation test Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 238000003911 water pollution Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N5/00—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid
- G01N5/04—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid by removing a component, e.g. by evaporation, and weighing the remainder
Abstract
The invention relates to a method for measuring and calculating the scouring pollution amount of deposited particles, which comprises the following steps: step 1: building a simulation test device; the water supply device comprises a water supply source, a water pump and a pipeline, wherein a notch is formed in the top of the pipeline, a sampling plate is arranged in the pipeline, a support is arranged below the pipeline, the water pump is arranged at the position of the water supply source, a water outlet pipe of the water pump is provided with a flow measuring device and an adjusting gate valve, and the water outlet pipe of the water pump is connected with the starting end of; step 2: sampling and measuring the test sediment; mixing the deposited particles with water, coating the mixture on a pipeline deposited area, starting a water pump to flush the deposited particles, taking out a sampling plate after the flushing is finished, drying the deposited particles, weighing the mass of the dried deposited particles, and obtaining and calculating the mass of the deposited particles on the sampling plate and the mass of the deposited particles in unit length of a pipeline; and step 3: calculating the sediment scouring rate according to a formula; the invention can measure and calculate the sediment scouring process, master the sediment scouring rule in the pipeline and solve the pollution problem caused by the sediment scouring in the pipeline.
Description
Technical Field
The invention relates to the technical field of calculation of scouring pollution amount of deposited particles, in particular to a method for measuring and calculating scouring pollution amount of deposited particles in a drainage pipeline.
Background
The drainage pipeline system is used as an important component of urban infrastructure, plays an important role in collecting and conveying rain and sewage, and has a great relation to stable urban development when the drainage pipeline system operates normally. However, suspended particles carried in rain and sewage can be settled under the influence of factors such as changes of water flow factors in the pipeline, so that the deposition phenomenon of the drainage pipeline is caused, and the deposition or sedimentation phenomenon in the drainage pipeline shows a general and gradually serious trend due to the reasons such as poor operation management, old pipeline and unreasonable design. The gradual accumulation of sediments in the pipeline can reduce the conveying capacity of the pipeline, cause pollutants, corrode the pipeline, and cause water pollution if the sediments enter a receiving water body along with water flow scouring under the condition of large flow.
In order to solve the pollution problem caused by the sediment scouring in the pipeline, the scouring rule of the sediment in the pipeline is mastered, the scouring process of the sediment is quantitatively calculated, and the contribution rate of the sediment scouring to the downstream pollution is evaluated. At present, in the research on the sediment scouring process of a pipeline, on one hand, the scouring rule of the sediment is described by establishing a mathematical or physical model, and on the other hand, the evolution process of the sediment is explored by monitoring the sediment and the scouring process in the drainage pipeline. But no simple and easy method is available for measuring and calculating the sediment scouring process. Therefore, it is necessary to design a new technical solution to solve the above problems comprehensively.
Disclosure of Invention
The invention aims to provide a method for measuring and calculating the scouring pollution amount of deposited particles, which can measure and calculate the scouring process of deposits, master the scouring rule of the deposits in a pipeline and solve the pollution problem caused by the scouring of the deposits in the pipeline.
In order to solve the technical problems, the invention adopts the following technical scheme:
a method for measuring and calculating the scouring pollution amount of deposited particles comprises the following steps:
step 1: building a simulation test device; the simulation experiment device comprises a water supply source, a water pump and a pipeline which is horizontally arranged, wherein a notch for placing sediments is formed in the top of the pipeline, the place where the sediments are placed is marked as a sediment area, sampling plates are arranged in the pipeline and are tightly attached to the inner wall of the pipeline at intervals, a support for adjusting the gradient of the pipeline is arranged below the pipeline, the water supply source is provided with the water pump, a water outlet pipe of the water pump is provided with a flow measurement device and an adjusting gate valve, and the water outlet pipe of the water pump is connected with the starting end of the pipeline;
step 2: sampling and measuring the test sediment; mixing the sediment particles with water, coating on the sediment region of the pipeline, and adjusting the water outlet rate of the water pump to v1Starting a water pump to flush the deposited particles, closing the water pump when the deposited particles do not migrate along with water flow any more, taking out the sampling plate to obtain deposited particles at corresponding positions, drying the deposited particles, weighing the dried deposited particles, and obtaining and calculating the mass of the deposited particles on the sampling plate at the corresponding positions and the mass of the deposited particles in unit length of the pipeline;
and step 3: calculating the erosion rate of the sediment;
the mass of deposited particles per unit length at a certain deposition position of the pipeline is as follows:
in the formula: x is the deposition position, cm; y is the mass of deposited particles per unit length, mg cm-1；a1，a2，b1And b2The numerical value is constant and is obtained from a fitting graph obtained by experimental data;
the total amount of deposited particles was:
in the formula: l is the length of the pipeline, cm; w is the mass of the deposited particles over the entire length of the pipeline, g;
the scouring rate is:
in the formula:
the washout rate,%; w0Is the initial total deposited mass, g, of the deposit area.
According to the measuring and calculating method for the scouring pollution amount of the deposited particles, the deposits are sampled and measured at the local positions in the pipeline, a mathematical model of the deposition positions and the deposition quality is established, and then the total amount and the scouring rate of the deposited particles in the whole pipeline are calculated; the method for locally sampling and measuring the deposited particles in the pipeline and establishing the mathematical model is simpler and more convenient to calculate, high in feasibility and accurate in result. The pipeline provided by the invention adopts transparent organic glass, so that the deposited particles in the pipeline can be conveniently observed, and the water flow can be conveniently controlled.
Drawings
FIG. 1 is a schematic structural diagram of a simulation test device for erosion rate of deposited particles according to the present invention;
FIG. 2 is a graph of experimental data and a fit for a single particle size deposited particle (0.125mm) of example 1 of the present invention;
FIG. 3 is a graph of experimental data and fit for two mixed particle size sedimentary granules (0.125mm, 0.5mm) according to example 2 of the present invention;
FIG. 4 is a graph of experimental data and a fit chart of particles with a particle size of 0.125mm in two types of particle size mixed deposition particles according to example 2 of the present invention;
FIG. 5 is a graph of experimental data and a fit for a particle size of 0.5mm in two types of mixed particle size sedimented particles according to example 2 of the present invention;
FIG. 6 is a graph of experimental data and fit for four mixed particle size sedimentary granules (0.125mm, 0.5mm, 0.85mm and 1mm) according to example 3 of the present invention;
FIG. 7 is a graph of experimental data and a fit chart of particles with a particle size of 0.125mm in four types of mixed deposition particles according to example 3 of the present invention;
FIG. 8 is a graph of experimental data and a fit for a particle size of 0.5mm from four mixed particle size sedimented particles according to example 3 of the present invention;
FIG. 9 is a graph of experimental data and a fit chart of particles having a particle size of 0.85mm among four types of particle size-mixed sediment particles in example 3 of the present invention;
FIG. 10 is a graph of experimental data and a fit for a particle having a particle size of 1mm from four mixed particle sizes of the sedimented particles according to example 3 of the present invention.
In the figure: 1. a water tank; 2. a submersible pump; 3. adjusting a gate valve; 4. a flow meter; 5. a pipeline; 6. a support; 7. a sediment zone; 8. and (4) sampling the plate.
Detailed Description
In order that the objects and advantages of the invention will be more clearly understood, the following description is given in conjunction with the accompanying examples. It is to be understood that the following text is merely illustrative of one or more specific embodiments of the invention and does not strictly limit the scope of the invention as specifically claimed.
The method for measuring and calculating the scouring pollution amount of the deposited particles comprises the following steps:
step 1: building a sediment scouring process simulation test device for a drainage pipeline; the simulation experiment device comprises a water tank, a water pump and a pipeline which is horizontally arranged, wherein the total length of the pipeline is 1200cm, the pipe diameter is 150mm, the pipeline is made of organic transparent glass, a notch for placing sediments is formed in the local top of the pipeline, specifically, a position 125-175 cm away from a pipe opening is marked as a sediment area; and marking sampling points at positions 225cm, 300cm, 375cm, 450cm, 700cm, 950cm and 1200cm away from the pipe orifice, and respectively placing light and thin sampling plates with the length of 14cm (along the water flow direction, namely the sampling plate is 14cm along the length of the pipeline) and the width of 20cm at the sampling points to enable the light and thin sampling plates to be tightly attached to the inner wall of the pipeline.
In the embodiment, the flushing water is provided by a flushing water tank, a submersible pump is arranged in the water tank, a flow meter and an adjusting gate valve are arranged on a water outlet pipe of the submersible pump to control the water outlet speed, and the water outlet pipe of the submersible pump is connected with the initial section of the pipeline.
Step 2: sampling and measuring the test sediment; before the test is started, the water outlet speed v of the submersible pump is adjusted by using an adjusting gate valve and a flowmeter1The water outlet rate v1The deposited particles can be flushed and floated and migrate along with the water flow, and part of the deposited particles are deposited again in the conveying process and are carried out of the pipeline by the water flow;
wherein the positions of the sampling plates are respectively 225cm, 300cm, 375cm, 450cm, 700cm, 950cm and 1200cm away from the pipe orifice, and the distances between the central position of the sampling plate and the original sediment area (175 cm away from the pipe orifice) at the front end of the pipeline are respectively as follows: 43cm, 118cm, 193cm, 268cm, 518cm, 768cm, 1018 cm. This distance serves as a position where the deposited particles are again deposited after being flushed.
Subsequent sampling and measurements were as follows:
example 1
Measuring and calculating the scouring rate of single-particle-size deposited particles in the drainage pipeline
In this example, 400g of sediment particles with a particle size of 0.125mm are selected, and a proper amount of water is added to be uniformly mixed and uniformly coated in a sediment area of a pipeline. After the submersible pump is started, water flow washes deposited particles in the pipeline at a constant flow rate of 1400L/H, the deposited particles are washed by the water flow to migrate, part of the deposited particles are deposited in the migration process, and part of the deposited particles flow out of the pipeline along with the water flow. And when the deposited particles are observed not to migrate along with the water flow, the water pump is closed, and the flushing test is completed.
And taking out each sampling plate in the pipeline, transferring the particles deposited on the sampling plates to filter paper, weighing the particles by a drying and weighing method, repeating each group of tests for 3 times, and averaging to obtain the mass of the deposited particles on each sampling plate for calculating the scouring rate.
The mass of the deposited particles measured on 7 sampling plates is shown in Table 1, and the mass of the deposited particles per unit length of each deposition position is shown in Table 2.
TABLE 1 quality of deposited particles on different position sampling plates
Data fitting of the deposited particles having a particle size of 0.125mm As shown in FIG. 2, a is obtained from the fitting equation1Is 3896, a2Is 0, b1Is-0.01234, b2And 0, obtaining the mass of the deposited particles per unit length at a certain deposition position of the pipeline as follows:
y＝3896*e-0.01234x
in the formula: x is the deposition position, cm; y is the mass of deposited particles per unit length, mg cm-1。
Where the sum variance (SSE) was 20398, the coefficient (R-square) was determined to be 0.9938, and the Root Mean Square (RMSE) was 63.87.
The function was integrated over the range of pipe particulate migration, from the end of the original deposit region (noted "0" cm), to the end of the pipe (1025 cm from the end of the original deposit region), and the total deposit (W) was calculated:
that is, 315.72g of the 0.125mm diameter sedimented particles were co-sedimented in the piping. Calculating the scour rate
It was thus calculated that the washing rate of the deposited particles having a particle size of 0.125mm in the drain pipeline was 21.07% under the above conditions.
Example 2
Measuring and calculating the scouring rate of two particle size deposited particles in the drainage pipeline
In this example, 200g of each of the deposited particles with the particle sizes of 0.125mm and 0.5mm are selected and uniformly mixed, and then a proper amount of water is added and uniformly mixed, and the mixture is uniformly coated in the deposit area of the pipeline. After the submersible pump is started, water flow washes deposited particles in the pipeline at a constant flow rate of 1400L/H, the deposited particles are washed by the water flow to migrate, part of the deposited particles are deposited in the migration process, and part of the deposited particles flow out of the pipeline along with the water flow. And when the deposited particles are observed not to migrate along with the water flow, the water pump is closed, and the flushing test is completed.
Taking out 7 sampling plates in the pipeline, transferring the particles deposited on the sampling plates to filter paper, weighing the particles by a drying and weighing method, then screening by using a steel screen with the aperture of 0.35mm to obtain deposited particles with the particle diameters of 0.125mm and 0.5mm, and then weighing respectively. Each group of tests was repeated 3 times, and the average value was taken to obtain the mass of the mixed sediment, the particles with the particle size of 0.125mm and the particles with the particle size of 0.5mm on each sampling plate, which was used for calculating the washing rate.
The mass of the deposited particles measured on the 7 sampling plates is shown in Table 3, and the mass of the deposited particles per unit length of each deposition position is shown in Table 4.
TABLE 3 quality of deposited particles on different position sampling plates
TABLE 4 mass of deposited particles per unit length of pipe
Data fitting of mixed deposited particles of two sizes of 0.125mm and 0.5mm is shown in FIG. 3, and a is obtained from the fitting equation1Is 7463, a2 Is 0, b1Is-0.02021, b2And 0, obtaining the mass of the deposited particles per unit length at a certain deposition position of the pipeline as follows:
y0＝7463e-0.02021x
in the formula: x is the deposition position, cm; y is0Mass of deposited particles per unit length, mg cm-1。
Where the sum variance (SSE) was 13.92, the coefficient of certainty (R-square) was 1, and the Root Mean Square (RMSE) was 1.669.
The function was integrated over the range of pipe particulate migration, from the end of the original deposit region (noted "0" cm), to the end of the pipe (1025 cm from the end of the original deposit region), and the total deposit (W) was calculated:
that is, 369.27g of the mixed particle size of 0.5mm and 0.125mm was co-deposited in the tubeCalculating the scour rate
It was thus calculated that the washout rate of the mixed settled particles of 0.125mm and 0.5mm in the drainline under the above conditions was 7.68%.
Data fitting of 0.125mm sediment particles of the two mixed sediment particles As shown in FIG. 4, a is obtained from the fitting equation1Is 3398, a2 Is 0, b1Is-0.01949, b2And 0, obtaining the mass of the deposited particles per unit length at a certain deposition position of the pipeline as follows:
y1＝3398e-0.01949x
in the formula: x is the deposition position, cm; y is1Mass of deposited particles per unit length, mg cm-1。
Where the sum variance (SSE) is 7.717, the coefficient (R-square) is determined to be 1, and the Root Mean Square (RMSE) is 1.242.
The function was integrated over the range of pipe particulate migration, from the end of the original deposit region (noted "0" cm), to the end of the pipe (1025 cm from the end of the original deposit region), and the total deposit (W) was calculated:
namely, 174.35g of 0.125 mm-diameter deposit particles in the two mixed deposit particles were co-deposited in the pipeline, and the washout rate was calculated
It was thus calculated that, under the above conditions, the rate of washing out of the deposited particles having a particle size of 0.125mm among the mixed deposited particles in the drain pipeline was 12.82%.
Data fitting of 0.5mm sediment particles of the two mixed sediment particles As shown in FIG. 5, a is obtained from the fitting equation1Is 4075, a2 Is 0, b1Is-0.02088, b2And 0, obtaining the mass of the deposited particles per unit length at a certain deposition position of the pipeline as follows:
y2＝4075e-0.02088x
in the formula: x is the deposition position, cm; y is2Mass of deposited particles per unit length, mg cm-1。
Where the sum variance (SSE) is 0.9793, the coefficient (R-square) is determined to be 1, and the Root Mean Square (RMSE) is 0.4426.
The function was integrated over the range of pipe particulate migration, from the end of the original deposit region (noted "0" cm), to the end of the pipe (1025 cm from the end of the original deposit region), and the total deposit (W) was calculated:
namely, 195.16g of 0.5 mm-diameter deposit particles in the two mixed deposit particles were co-deposited in the pipeline, and the washout rate was calculated
Therefore, under the conditions, the scouring rate of the deposited particles with the particle size of 0.5mm in the mixed deposited particles in the drainage pipeline is calculated to be 2.42 percent.
Example 3
Measuring and calculating the scouring rate of the deposited particles with various particle sizes in the drainage pipeline
In the embodiment, 200g of four kinds of deposition particles with the particle sizes of 0.125mm, 0.5mm, 0.85mm and 1mm are selected and uniformly mixed, then a proper amount of water is added and uniformly mixed, and the mixture is uniformly coated in a deposition area of a pipeline. After the submersible pump is started, water flow washes deposited particles in the pipeline at a constant flow rate of 2500L/H, the deposited particles are washed by the water flow to migrate, part of the deposited particles are deposited in the migration process, and part of the deposited particles flow out of the pipeline along with the water flow. And when the deposited particles are observed not to migrate along with the water flow, the water pump is closed, and the flushing test is completed.
Taking out 7 sampling plates in the pipeline, transferring the particles deposited on the sampling plates to filter paper, weighing the particles by a drying and weighing method, and then sequentially screening the particles by using steel sieves with the aperture of 0.35mm, 0.7mm and 0.9mm to obtain the deposited particles with the particle diameters of 0.125mm, 0.5mm, 0.85mm and 1mm respectively and then weighing the particles. Each group of experiments is repeated for 3 times, and the average value is taken to obtain the deposition mass of the mixed deposition particles, 0.125mm particle size particles, 0.5mm particle size particles, 0.85mm particle size particles and 1mm particle size particles on each sampling plate for calculating the scouring rate.
The mass of the deposited particles measured on the 7 sampling plates is shown in Table 5, and the mass of the deposited particles per unit length of each deposition position is shown in Table 6.
TABLE 5 quality of deposited particles on different position sampling plates
TABLE 6 mass of deposited particles per unit length of pipe
Data fitting was performed on mixed deposit granules of four particle sizes of 0.125mm, 0.5mm, 0.85mm and 1mm as shown in FIG. 6, and a was obtained from the fitting equation121420, a2 Is 0, b1Is-0.03058, b2And 0, obtaining the mass of the deposited particles per unit length at a certain deposition position of the pipeline as follows:
y0＝21420e-0.03058x
in the formula: x is the deposition position, cm; y is0Mass of deposited particles per unit length, mg cm-1。
Where the sum variance (SSE) is 21220, the coefficient (R-square) is determined to be 0.9992, and the Root Mean Square (RMSE) is 65.15.
The function was integrated over the range of pipe particulate migration, from the end of the original deposit region (noted "0" m), to the end of the pipe (1025 cm from the end of the original deposit region), and the total deposit (W) was calculated:
namely, 700.46g of the mixed particle size particles with four particle sizes are co-deposited in the pipeline, and the scouring rate is calculated
Therefore, under the conditions, the scouring rate of the four particle size mixed deposition particles in the drainage pipeline is calculated to be 12.44%.
Data fitting of 0.125mm sediment pellet of the four mixed sediment pellets as shown in FIG. 7, a is obtained from the fitting equation1Is 5065, a2 Is 0, b1Is-0.03104, b2And 0, obtaining the mass of the deposited particles per unit length at a certain deposition position of the pipeline as follows:
y1＝5065e-0.03104x
in the formula: x is the deposition position, cm; y is1Mass of deposited particles per unit length, mg cm-1。
Where the sum variance (SSE) was 5761, the coefficient (R-square) was determined to be 0.996, and the Root Mean Square (RMSE) was 33.94.
The function was integrated over the range of pipe particulate migration, from the end of the original deposit region (noted "0" cm), to the end of the pipe (1025 cm from the end of the original deposit region), and the total deposit (W) was calculated:
namely, 163.18g of 0.125 mm-size particles in the four-particle-size mixed deposition particles are co-deposited in the pipeline, and the scouring rate is calculated
It was thus calculated that, under these conditions, the washout rate of the deposited particles in the duct for 0.125mm deposited particles among the four kinds of mixed deposited particles in the duct was 18.41%.
Data fitting of 0.5mm sediment pellet of the four mixed sediment pellets as shown in FIG. 8, a is obtained from the fitting equation1Is 5350, a2Is 84.46, b1Is-0.03309, b2And 0.006481, obtaining the mass of deposited particles per unit length at a certain deposition position of the pipeline as follows:
y2＝5350e-0.03309x+84.46e-0.006481x
in the formula: x is the deposition position, cm; y is2Mass of deposited particles per unit length, mg cm-1. Where the sum variance (SSE) is 0.02602, the coefficient (R-square) is determined to be 1, and the Root Mean Square (RMSE) is 0.09314.
The function was integrated over the range of pipe particulate migration, from the end of the original deposit region (noted "0" cm), to the end of the pipe (1025 cm from the end of the original deposit region), and the total deposit (W) was calculated:
namely, 0.5mm particles in the four-particle-size mixed sediment particlesThe accumulated particles are co-deposited in the pipeline at 174.70g, and the scouring rate is calculated
It is thus calculated that under the conditions, the scouring rate of 0.5mm deposited particles in the four particle size mixed deposited particles in the pipeline is 12.65%.
Data fitting of 0.85mm deposit particle of the four mixed deposit particles As shown in FIG. 9, a is obtained from the fitting equation1Is 5519, a2 Is 0, b1Is-0.03004, b2And 0, obtaining the mass of the deposited particles per unit length at a certain deposition position of the pipeline as follows:
y3＝5519e-0.03004x
in the formula: x is the deposition position, cm; y is3Mass of deposited particles per unit length, mg cm-1。
Where the sum variance (SSE) was 493, the coefficient (R-square) was determined to be 0.9997, and the Root Mean Square (RMSE) was 9.93.
The function was integrated over the range of pipe particulate migration, from the end of the original deposit region (noted "0" cm), to the end of the pipe (1025 cm from the end of the original deposit region), and the total deposit (W) was calculated:
namely, 183.72g of 0.85 mm-size particles in the four-particle-size mixed deposition particles were co-deposited in the pipeline, and the washout rate was calculated
It was thus calculated that, under these conditions, the washout rate of 0.85mm deposited particles among the four particle size mixed deposited particles in the duct was 8.14%.
Data fitting of 1mm deposited particles of the four mixed deposited particles As shown in FIG. 10, a was obtained from the fitting equation1Is 6159, a2 Is 0, b1Is-0.03213, b2And 0, obtaining the mass of the deposited particles per unit length at a certain deposition position of the pipeline as follows:
y4＝6159e-0.03213x
in the formula: x is the deposition position, cm; y is4Mass of deposited particles per unit length, mg cm-1。
Where the sum variance (SSE) is 790.2, the coefficient of certainty (R-square) is 0.9996, and the Root Mean Square (RMSE) is 12.57.
The function was integrated over the range of pipe particulate migration, from the end of the original deposit region (noted "0" cm), to the end of the pipe (1025 cm from the end of the original deposit region), and the total deposit (W) was calculated:
namely, 191.69g of 1 mm-size particles in the mixed sediment of four particle sizes were co-deposited in the pipeline, and the washout rate was calculated
From this, it was calculated that, under the above conditions, the flush rate of 1mm deposited particles out of the four kinds of mixed deposited particles in the pipeline was 4.16%.
In a word, the method for measuring and calculating the scouring pollution amount of the deposited particles provided by the invention is simple and convenient and has high feasibility, the deposited particles are sampled and measured at the local position in the pipeline, a mathematical model of the deposition position and the deposition quality is established, and the total amount and the scouring rate of the deposited particles in the whole pipeline are calculated.
The present invention is not limited to the above embodiments, and those skilled in the art can make various equivalent changes and substitutions without departing from the principle of the present invention after learning the content of the present invention, and these equivalent changes and substitutions should be considered as belonging to the protection scope of the present invention.
Claims (3)
1. A method for measuring and calculating the scouring pollution amount of deposited particles is characterized by comprising the following steps:
step 1: building a simulation test device; the simulation experiment device comprises a water supply source, a water pump and a pipeline which is horizontally arranged, wherein a notch for placing sediments is formed in the top of the pipeline, the place where the sediments are placed is marked as a sediment area, sampling plates are arranged in the pipeline and are tightly attached to the inner wall of the pipeline at intervals, a support is arranged below the pipeline, the water supply source is provided with the water pump, and a water outlet pipe of the water pump is connected with the starting end of the pipeline;
step 2: sampling and measuring the test sediment; mixing the sediment particles with water, coating on the sediment region of the pipeline, and adjusting the water outlet rate of the water pump to v1Starting a water pump to flush the deposited particles, closing the water pump when the deposited particles do not migrate along with water flow any more, taking out the sampling plate to obtain deposited particles at corresponding positions, drying the deposited particles, weighing the dried deposited particles, and obtaining and calculating the mass of the deposited particles on the sampling plate at the corresponding positions and the mass of the deposited particles in unit length of the pipeline;
and step 3: calculating the erosion rate of the sediment;
the mass of deposited particles per unit length at a certain deposition position of the pipeline is as follows:
in the formula: x is the deposition position, cm; y is deposition particle per unit lengthMass of pellets, mg. cm-1；a1，a2，b1And b2Is a constant;
the total amount of deposited particles was:
in the formula: l is the length of the pipeline, cm; w is the mass of the deposited particles over the entire length of the pipeline, g;
the scouring rate is:
in the formula:
the washout rate,%; w0Is the initial total deposited mass, g, of the deposit area.
2. The method for measuring and calculating the amount of deposited particulate washout contamination of claim 1, wherein: and a flow measuring device and an adjusting gate valve are arranged on a water outlet pipe of the water pump.
3. The method for measuring and calculating the amount of deposited particulate washout contamination of claim 1, wherein: the pipeline is made of transparent organic glass.
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| CN202010568075.5A CN111551467A (en) | 2020-06-19 | 2020-06-19 | Method for measuring and calculating scouring pollution amount of deposited particles |
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Application publication date: 20200818 |