CN112179729B - Pipeline sediment simulation experiment device, experiment system and experiment method - Google Patents
Pipeline sediment simulation experiment device, experiment system and experiment method Download PDFInfo
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- CN112179729B CN112179729B CN201910600656.XA CN201910600656A CN112179729B CN 112179729 B CN112179729 B CN 112179729B CN 201910600656 A CN201910600656 A CN 201910600656A CN 112179729 B CN112179729 B CN 112179729B
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- 239000013049 sediment Substances 0.000 title claims abstract description 108
- 238000004088 simulation Methods 0.000 title claims abstract description 46
- 238000002474 experimental method Methods 0.000 title claims abstract description 41
- 238000000034 method Methods 0.000 title claims abstract description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 354
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 18
- 239000001301 oxygen Substances 0.000 claims abstract description 18
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 18
- 238000010521 absorption reaction Methods 0.000 claims abstract description 6
- 239000012528 membrane Substances 0.000 claims description 31
- 230000007246 mechanism Effects 0.000 claims description 22
- 238000005273 aeration Methods 0.000 claims description 18
- 239000003570 air Substances 0.000 claims description 14
- 238000007789 sealing Methods 0.000 claims description 14
- 229910000831 Steel Inorganic materials 0.000 claims description 10
- 239000010959 steel Substances 0.000 claims description 10
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 8
- 239000007789 gas Substances 0.000 claims description 7
- 230000001105 regulatory effect Effects 0.000 claims description 6
- 229910052757 nitrogen Inorganic materials 0.000 claims description 4
- 238000001914 filtration Methods 0.000 claims description 3
- 238000005276 aerator Methods 0.000 claims description 2
- 238000009991 scouring Methods 0.000 abstract description 23
- 238000012360 testing method Methods 0.000 abstract description 12
- 230000003628 erosive effect Effects 0.000 description 11
- 238000011010 flushing procedure Methods 0.000 description 6
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- 235000015097 nutrients Nutrition 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 239000010865 sewage Substances 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
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- 239000000853 adhesive Substances 0.000 description 1
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- 238000006243 chemical reaction Methods 0.000 description 1
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- 230000001747 exhibiting effect Effects 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
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- 231100000719 pollutant Toxicity 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
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- 239000010802 sludge Substances 0.000 description 1
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- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/56—Investigating resistance to wear or abrasion
- G01N3/567—Investigating resistance to wear or abrasion by submitting the specimen to the action of a fluid or of a fluidised material, e.g. cavitation, jet abrasion
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
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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
- G01N5/02—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid by absorbing or adsorbing components of a material and determining change of weight of the adsorbent, e.g. determining moisture content
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Abstract
The invention discloses a pipeline sediment simulation experiment device, an experiment system and an experiment method. The system increases the number of the water tank components and the pipeline components on the basis of the pipeline sediment simulation experiment device, can simultaneously carry out the contrast experiments of various different sediments or different flow rates, and improves the experiment efficiency. The invention also discloses a pipeline sediment simulation experiment device which comprises a water tank component, a pipeline component and an internal circulating water pump, can be used for sediment oxygen absorption tests, sediment anti-scouring tests under anaerobic conditions and the like, and is an experiment device widely suitable for various pipeline sediment simulation tests.
Description
Technical Field
The invention relates to the technical field of water environment restoration, in particular to a pipeline sediment simulation experiment device, an experiment system and an experiment method.
Background
The scour resistance of the deposit is commonly known as erosion transport characteristics. The research of the method is initiated by the research of the stability of sediment sludge of tidal beaches and sea entrances by oceanographic students.
There are several different methods for quantitative investigation of deposit washout resistance.
The most common pipeline flushing experiment is to adopt a section of pipeline (circular or rectangular cross section) to lay the sediment therein, and observe and calculate the amount of the particles which are flushed and flooded by the sediment in a mode of increasing flushing water amount (hydraulic shearing force) in a stepped manner. According to the existing hydraulic formula, the shearing force generated by water flow at a specific flow rate is calculated, the erosion rate of the sediment is defined, and the shearing force of the water flow required by corresponding erosion of the sediment is obtained, so that the erosion resistance of the sediment is evaluated, and a foundation is laid for the erosion transport theory of the sediment.
Another approach is to have a deposit at one bottom. In the device with water at the upper part, a water flow shearing force is provided by stirring the overlying water, hydraulic shearing force under different stirring rotating speeds is calculated according to a formula, and the erosion rate of sediment at the bottom is represented by turbidity change in the overlying water, so that the stability of the sediment is evaluated. In addition, annular water tanks, adhesive force meters, etc. are also used to determine the erosion resistance of the deposit.
Unlike inorganic grits, natural sediments including tidal flat silt, estuary silt, river sediment, pipe sediment, etc. have biochemical activities, exhibiting cohesiveness and cohesion. And is therefore referred to as a tacky deposit. The research on the scouring resistance is the basis of engineering and related engineering projects related to water, in particular to the stability of river slopes and dykes, the movement of coastal sediments, the stability of salt biogas, the scouring around piers, navigation, water quality and the like. Prediction of short and long term erosion rates and deposition rates to detect marine environments is critical to coastal engineering.
At present, municipal sewage and rainwater pipeline scour resistance research is weak. Most researchers have studied their anti-scour properties by synthesizing or collecting the sediment in situ, culturing it in a specific environment for a period of time. The controlled environmental factors include the culture time, which is used for simulating the influence of the number of sunny days and the consolidation effect in the earlier stage. Temperature is an important environmental variable, a major factor affecting biological activity in the deposit; oxygen is another important condition affecting biological activity, and the amount of oxygen will directly lead to changes in the colony structure and diversity of microorganisms in the sediment, thereby affecting the hydraulic conditions of mass conversion rate. The stability change of the sediment is explored by changing the shearing force of water flow acting on the sediment and simulating the actual pipeline environment.
The experimental procedure included a preceding deposition period and a subsequent washout period. During the deposition period, the properties (due to biological growth) and structure (due to inter-particle bonding) of the high organic content deposit will change over time, resulting in a change in the erosion resistance of the deposit.
Disclosure of Invention
The invention aims at overcoming the technical defects in the prior art and provides a pipeline sediment simulation experiment device which comprises a circulating water tank assembly, a water tank assembly and a pipeline assembly and can be used for sediment simulation culture and sediment scouring resistance test.
Another object of the present invention is to provide a pipe sediment simulation experiment system, which increases the number of water tank components and pipe components based on the pipe sediment simulation experiment device, and can simultaneously perform a plurality of comparison experiments of different sediment or different flow rates, thereby improving the experiment efficiency.
The invention further aims to provide a pipeline sediment simulation experiment device which comprises a water tank assembly, a pipeline assembly and an internal circulating water pump, can be used for sediment oxygen absorption tests, sediment anti-scouring tests under anaerobic conditions and the like, and is widely suitable for various pipeline sediment simulation tests.
The technical scheme adopted for realizing the purpose of the invention is as follows:
the utility model provides a pipeline sediment simulation experiment device, includes the basin, sets up through angle adjustment mechanism pipeline reactor and the circulation water tank subassembly of basin top, wherein:
the pipeline reactor comprises a circular pipeline for containing sediment, and a water inlet and a water outlet are respectively formed at two ends of the circular pipeline;
The utility model discloses a water tank, including basin, filter membrane, pipeline, water inlet, water outlet, filter membrane detachable, the one end of basin is equipped with the inlet port, and the other end is equipped with the outlet port, be equipped with in the basin to the water through the inlet port filters and collects the filter membrane of filter media, filter membrane detachable assembles in the basin, the inlet port is located the below of delivery port so that the water flows automatically to in the inlet port, or the inlet port through the pipeline with the delivery port is linked together.
The circulating water tank assembly comprises a water tank main body, a water pump arranged in the water tank main body, a water pipe connected with the water pump and used for conveying water to the water inlet, and a water return port arranged on the side wall of the bottom of the water tank main body, wherein the water return port is communicated with a water return hole arranged at one end of the water tank through a water pipe.
In the technical scheme, the water pipe is provided with the valve and the flowmeter, and the water pipe is provided with the first one-way valve.
In the technical scheme, the water distribution flower walls are fixed at the openings at the two ends of the circular pipeline.
In the above technical scheme, the inside small backwater water tank that is provided with of water tank main part, be provided with the second check valve on the lateral wall of small backwater water tank so that the water in the small backwater water tank of backwater one-way inflow in the water tank main part.
The experimental method based on the pipeline sediment simulation experimental device comprises the following steps of:
Step 1: placing the sediment to be tested or cultivated in the pipeline reactor;
Step 2: the water pump is turned on, the water flow speed is regulated, water in the water tank main body is input into the uppermost pipeline reactor through the water pipe and the water inlet, after flowing through the pipeline reactor, the water enters the water tank through the water outlet, the filter membrane filters the flowing water in the water tank, and then flows back into the water tank main body through the water return hole for circulation
Step 3: after running for a preset time, the water pump is turned off, and sediment in the pipeline reactor is sampled and analyzed to complete sediment simulation culture experiments;
Or taking out the filter membrane in the water tank, collecting sediment on the filter membrane, weighing to determine the anti-scouring performance of the sediment under the experimental condition, and completing an anti-scouring simulation experiment.
The simulation experiment system based on the pipeline sediment anti-scouring experiment device comprises a circulating water tank assembly and at least two groups of water tanks and pipeline reactors which are arranged up and down in sequence, wherein a water pipe of the circulating water tank assembly transmits water to the uppermost pipeline reactor, and a water return port of the circulating water tank assembly is communicated with a water return hole on the lowermost water tank through a water pipe; the water inlet of each pipeline reactor is an arc-shaped groove with an opening at the top, and the water outlet of each water groove is a flashboard formed on the side wall of the water groove; two adjacent groups of water tanks and pipeline reactors are connected through an angle adjusting mechanism, and water flowing out of a water outlet port of the water tank above flows into a water inlet of the pipeline reactor below under the action of gravity.
The experimental method based on the simulation experimental system comprises the following steps:
Step 1: selecting a preset number of water tanks and pipeline reactors for assembly and fixation, and switching on a circulating water assembly, wherein sediment to be tested or cultivated is placed into the pipeline reactor (2);
Step 2: the water pump is started, the water flow speed is regulated, water in the water tank main body is input into the uppermost pipeline reactor through the water pipe and the water inlet, and the water flow flows through each pipeline reactor and the water tank to carry out sediment simulation culture or anti-scouring simulation experiment and then enters the water tank main body to carry out a circulation process;
Step 3: after running for a preset time, the water pump is turned off, and sediment in the pipeline reactor (2) is sampled and analyzed to complete sediment simulation culture experiments;
Or taking out the filter membrane (7) in the water tank (1), collecting sediment on the filter membrane (7), weighing to determine the anti-scouring performance of the sediment under the experimental condition, and completing an anti-scouring simulation experiment. .
The utility model provides a closed pipeline sediment simulation experiment device, includes the basin, sets up through angle adjustment mechanism pipeline reactor directly over the basin and will basin and pipeline reactor are linked together's circulation pipeline, wherein:
The pipeline reactor comprises a circular pipeline for containing sediment, two ends of the circular pipeline are respectively provided with a sealing plate, a water inlet and a water outlet are respectively formed in the sealing plates, and independent water inlets and independent air discharge pipes are also arranged in the sealing plates;
the water tank is a sealed water tank, a water inlet port is arranged on the side wall of the water tank, an aeration pipe is arranged in the water tank, a filter membrane for filtering water passing through the water inlet port and collecting filtered matters is arranged in the water tank, and the filter membrane is detachably assembled in the water tank;
The circulating pipeline comprises an internal circulating water pump placed in the water tank, a water inlet pipe with one end connected to the internal circulating water pump and the other end connected to the water inlet, and a water outlet pipe communicated with the water outlet and the water inlet port.
In the technical scheme, one end of the aeration pipe is provided with aeration holes which are arranged in a combined way, and the other end of the aeration pipe is connected with a fan or a gas steel cylinder.
An experimental method based on the closed pipeline sediment simulation device comprises the following steps:
step A: placing sediment to be tested or cultivated into the pipeline reactor, and covering a sealing plate;
and (B) step (B): opening a gas steel bottle or a fan, introducing nitrogen, oxygen or air into the water tank through the aeration pipe, and simultaneously opening the air release pipe;
step C: after aeration is completed, closing a gas steel bottle or a fan, an independent water inlet and a gas release pipe, opening an internal circulating water pump, and adjusting the water flow so that circulating water circularly flows between a water tank and a pipeline reactor;
step D: after a predetermined period of circulating flow, the oxygen content in the circulating water is measured, an oxygen absorption curve is drawn, or the filter membrane in the water tank is taken out and weighed to determine the sediment scouring resistance under anaerobic conditions.
In the above-mentioned pipeline sediment simulation experiment device, the angle adjusting mechanism includes two height adjusting parts that symmetry set up, the height adjusting parts is including setting up be used for carrying on the basin the diaphragm of pipeline reactor and set up the pipeline reactor with the altitude mixture control bracing piece between the diaphragm.
Compared with the prior art, the invention has the beneficial effects that:
1. compared with the traditional pipeline sediment experiment device, the pipeline sediment anti-scouring experiment device has multiple functions, and sediment simulation culture and anti-scouring experiment can be realized through simple component assembly.
2. The simulation experiment system has the advantages of densely integrated parts, small occupied space, capability of simultaneously carrying out a plurality of parallel experiments or experiments with different flow rates and powerful functions.
3. The closed pipeline sediment simulation device can realize various experimental operation functions, is simple to operate and has higher automation degree.
Drawings
FIG. 1 is a schematic diagram showing the construction of a pipe deposit anti-scour test apparatus in example 1.
Fig. 2 is a schematic view showing the structure of the circulation tank assembly in embodiment 1.
FIG. 3 is a schematic diagram showing the structure of a simulation experiment system in example 2.
Fig. 4 is a schematic diagram showing the structure of a closed type pipe deposit simulation device in example 3.
In the figure: the device comprises a water tank, a 2-pipeline reactor, a 3-water inlet, a 4-water outlet, a 5-water inlet, a 6-water outlet, a 7-filter membrane, an 8-water tank main body, a 9-water pump, a 10-water delivery pipe, an 11-water return port, a 12-first one-way valve, a 13-sealing plate, a 14-internal circulating water pump, a 15-water inlet pipe, a 16-water outlet pipe, a 17-aeration pipe, a 18-aeration hole, a 19-cross plate, a 20-height adjusting knob, a 21-water return hole, a 22-independent water inlet, a 23-air release pipe, a 24-water distribution flower wall, a 25-water return small water tank, a 26-second one-way valve, a 27-valve and a 28-flowmeter.
Detailed Description
The present invention will be described in further detail with reference to specific examples. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
Example 1
The utility model provides a pipeline deposit anti-scour experimental apparatus, includes basin 1 and passes through angle adjustment mechanism setting up pipeline reactor 2 directly over the basin 1, wherein:
as shown in fig. 1, the pipe reactor 2 comprises a circular pipe for accommodating the sediment, and a water inlet 3 and a water outlet 4 are respectively formed at two ends of the circular pipe;
The one end of basin 1 is equipped with inlet port 5, and the other end is equipped with outlet port 6, thereby outlet port 6 is for setting up the flashboard of adjustable size regulation water velocity that opens and shuts in basin 1 one end, be equipped with in the basin to pass through inlet port 5's water filters and collects filter membrane 7 of thing, filter membrane 7 passes through recess pull detachable assembly on the inner wall of basin 1 both sides is in basin 1 and be located outlet port 6's top, inlet port 5 is located directly under the delivery port 4 or through the pipeline with delivery port 4 is linked together.
As shown in fig. 2, the circulating water tank assembly comprises a water tank main body 8, a water pump 9 arranged in the water tank main body 8, a water pipe 10 connected with the water pump 9 and used for conveying water to the water inlet 3, and a water return port 11 arranged on the side wall of the bottom of the water tank main body 8, wherein the water return port 11 is communicated with a water return hole 21 arranged at one end of the water tank 1 through a water pipe.
During experiments, sediment is placed in the pipeline reactor 2, the water pump 9 is turned on, water in the water tank main body 8 is added into the pipeline reactor 2 through the water pipe 10 and the water inlet 3, flushing is formed on the sediment when the water flows in the pipeline reactor 2, the water mixed with sediment flows into the water tank 1 through the water outlet 4 and the water inlet port 5, the sediment is filtered through the filter membrane 7, the sediment is remained on the filter membrane 7, the water is discharged through the water inlet port 5, and the anti-flushing performance of the sediment can be considered by calculating the quality of the sediment on the filter membrane 7.
The angle adjusting mechanism comprises two symmetrically arranged height adjusting parts, wherein each height adjusting part comprises a transverse plate 19 arranged on the water tank 1 and used for bearing the pipeline reactor 2, and a height adjusting supporting rod 20 arranged between the pipeline reactor 2 and the transverse plate 19. The height-adjusting support bar 20 includes a pole fixed to the upper pipe reactor 2, another pole fixed to the cross plate 19, and a height-adjusting knob connecting both poles. The height adjusting knob can adjust the relative position between the two struts, thereby adjusting the height of the entire height adjusting support bar 20.
By adjusting the heights of the two height adjustment support rods 20 in the angle adjustment mechanism, the inclination angle of the pipe reactor 2 can be adjusted, so that the pipe reactor 2 has different slopes, and the larger the slope is, the larger the water flow speed is, and the smaller the slope is, the smaller the water flow speed is. The flow rate of the water flow is adjusted by adjusting the angle adjusting mechanism, and the influence of the flow rate on the anti-scouring performance of the sediment is considered. Simultaneously, the inclination of the pipeline reactor 2 is adjusted, and the anti-scouring performance of sediments in pipelines with different gradients can be simulated.
As a preferred mode, the water pipe 10 is provided with a valve 27 and a flowmeter 28, the water flow of the water pipe 10 can be controlled by the valve 27 under the condition that the water pump 9 is not closed, the switching frequency of the water pump 9 is reduced, the service life is prolonged, and the water flow can be controlled. The first check valve 12 allows water to flow only from the water tank 1 into the tank body 8.
Preferably, the openings at two ends of the circular pipeline are respectively fixed with a water distribution wall 24, and the water pipe is provided with a first one-way valve 12. The distribution wall 24 is a baffle provided with a plurality of small holes for reducing the flow rate of the water flow entering the pipe reactor 2, preventing the water flow from striking the sediment deposited in the pipe reactor 2.
Preferably, a small backwater tank 25 is arranged in the tank body 8, and a second one-way valve 26 is arranged on the side wall of the small backwater tank 25 so that water in the small backwater tank 25 flows into the tank body 8 in a one-way manner. The sewage that contains various pollutants is stored to water tank main part 8 inside, in order to practice thrift the space, the height of water tank main part 8 is higher, and the cross-sectional area is less, and so the pressure of water tank main part 8 bottom just is bigger, and the little water tank 25 of return water's the joining has avoided water tank main part 8 bottom water pressure too big, causes the problem that water that bottom basin 1 comes out can't get back to in the water tank main part 8.
Example 2
The simulation experiment system based on the pipeline sediment anti-scouring experiment device of the embodiment 1 comprises a circulating water tank assembly and at least two groups of water tanks 1 and pipeline reactors 2 which are arranged up and down and are connected through an angle adjusting mechanism, a water pipe 10 of the circulating water tank assembly is used for conveying water to the uppermost pipeline reactor 2, and a water return port 11 of the circulating water tank assembly is communicated with a water return hole 21 on the lowermost water tank 1 through a water pipe; the water inlet 3 of each pipeline reactor 2 is an arc-shaped groove with an opening at the top, the water outlet 6 of each water tank 1 is a flashboard formed on the side wall of the water tank, and the water flow speed can be controlled by controlling the opening and closing of the flashboard; two adjacent groups of water tanks 1 and pipeline reactors 2 which are connected through an angle adjusting mechanism, and water flowing out from a water outlet port 6 of the water tank 1 above flows into a water inlet 3 of the pipeline reactor 2 below under the action of gravity.
In the above simulation experiment system, a proper number of the tanks 1 and the pipe reactors 2 may be selected to be assembled according to actual experiment needs. During assembly, the positions of the water outlets, the water inlets, the water inlet ports and the water outlet ports are required to be connected, so that water flow is prevented from flowing out of the system. In order to ensure stable water flow from the water pipe 10, a single water tank 1 can be added at the uppermost part, water is injected into the water tank 1 by the water pipe, and then the water flows out of the flashboard at the other end stably and enters the pipeline reactor 2, as shown in fig. 3.
An experimental method for carrying out a simulation culture experiment by using the simulation experiment system comprises the following steps:
step 1: the water tank 1 and the pipeline reactor 2 which are connected through the angle adjusting mechanism are selected to be assembled and fixed, the water tank 1 and the pipeline reactor 2 are placed on a welded steel frame, a circulating water assembly is turned on, sediment to be cultivated is placed into the pipeline reactor 2, and a filter membrane 7 does not need to be installed in the water tank 1;
Step 2: adding nutrient solution required by culture into the water tank main body 8, opening the water pump 9, adjusting the water flow speed through the valve 27 and the inclination angle of the pipeline reactors 2, inputting water in the water tank main body 8 into the uppermost pipeline reactor 2 through the water pipe 10 and the water inlet 3, and allowing the water flow to flow through each pipeline reactor 2 and the water tank 1 for sediment simulation culture and enter the water tank main body 8 for circulation;
step 3: after a period of operation, the water pump 9 is turned off to complete the sediment simulation culture.
In the experiment, the inclination angle of the pipeline reactor 2 is adjusted to enable the pipeline reactor 2 to have a smaller gradient, so that water flow slowly flows through sediment, and flushing of the sediment by the water flow is reduced. The simulation experiment system can be used for culturing different sediments under the same environment and water flow speed, and multiple groups of parallel experiments can be simultaneously carried out.
An experimental method for detecting the anti-scouring performance by using the simulation experimental system comprises the following steps:
Step 1: selecting a proper number of groups of water tanks 1 connected through an angle adjusting mechanism, assembling and fixing the water tanks and a pipeline reactor 2, and connecting a circulating water component, and placing sediment to be tested into the pipeline reactor 2, wherein a filter membrane 7 is arranged in each water tank 1;
Step 2: the water pump 9 is turned on, the water flow speed is regulated through the valve 27 and the inclination angle of the pipeline reactor 2, water in the water tank main body 8 is input into the pipeline reactor 2 positioned at the uppermost part through the water pipe 10 and the water inlet 3, the water flows through each pipeline reactor 2 and the water tank 1 to carry out sediment anti-scouring simulation experiment and then enters the water tank main body 8 to carry out a circulation process, in the circulation process, sediment is scoured through the water flow of the pipeline reactor 2, and the scoured and scattered sediment enters the water tank 1 below along with the water flow, is filtered by the filter membrane 7 and is collected;
Step 3: after a period of operation, the water pump 9 was turned off, and the filter membrane 7 in each water tank 1 was taken out and weighed to determine the anti-scour properties of the sediment under the experimental conditions.
The erosion resistance test of the sediment is mainly carried out by detecting the drifting amount of the sediment under the condition of water flow scouring. In the sediment anti-scouring test, the pre-weighed removable filter membranes 7 are fixed on the inner walls of the two sides of the water tank 1, and sediment which drifts along with water flow is collected. And after the test is finished, the removable filter membrane 7 is extracted and weighed, and the weight difference between the two times of weighing is the sediment drifting amount in the sediment anti-scouring test.
The simulation experiment system can be used for detecting the scouring resistance of different sediments under the same environment and water flow speed, and multiple groups of parallel experiments can be simultaneously carried out. The inclination angle of each angle adjusting mechanism or the opening and closing angle of each water outlet port 6 flashboard can be adjusted, different water flow speeds can be generated in a set of simulation experiment system, and the influence of the different water flow speeds on the sediment scour resistance can be detected.
Example 3
As shown in fig. 4, the closed pipeline sediment simulation device comprises a water tank 1, a pipeline reactor 2 arranged right above the water tank 1 through an angle adjusting mechanism and a circulating pipeline for communicating the water tank 1 and the pipeline reactor 2, wherein: the pipeline reactor 2 comprises a circular pipeline for containing sediment, two ends of the circular pipeline are respectively provided with a sealing plate 13, a water inlet 3 and a water outlet 4 are respectively formed on the sealing plates, and the sealing plates 13 are also provided with an independent water inlet 22 and an independent air release pipe 23; the water tank 1 is a sealed water tank, a water inlet port 5 is arranged on the side wall of the water tank 1, an aerator pipe 17 is arranged in the water tank 1, a filter membrane 7 for filtering water passing through the water inlet port 5 and collecting filtered matters is arranged in the water tank 1, and the filter membrane 7 is detachably assembled in the water tank 1; the circulating pipeline comprises an inner circulating water pump 14 arranged in the water tank 1, a water inlet pipe 15 communicated with the inner circulating water pump 14 and passing through the water outlet port 6 and the water inlet port 3, and a water outlet pipe 16 communicated with the water outlet port 4 and the water inlet port 5.
Preferably, the angle adjusting mechanism comprises two symmetrically arranged height adjusting parts, wherein the height adjusting parts comprise a transverse plate 19 arranged on the water tank 1 and used for bearing the pipeline reactor 2, and a height adjusting supporting rod 20 arranged between the pipeline reactor 2 and the transverse plate 19. The height-adjusting support bar 20 includes a pole fixed to the upper pipe reactor 2, another pole fixed to the cross plate 19, and a height-adjusting knob connecting both poles. The height adjusting knob can adjust the relative position between the two struts, thereby adjusting the height of the entire height adjusting support bar 20.
By adjusting the heights of the two height adjustment support rods 20 in the angle adjustment mechanism, the inclination angle of the pipe reactor 2 can be adjusted, so that the pipe reactor 2 has different slopes, and the larger the slope is, the larger the water flow speed is, and the smaller the slope is, the smaller the water flow speed is. The flow rate of the water flow is adjusted by adjusting the angle adjusting mechanism, and the influence of the flow rate on the sediment is considered.
Preferably, one end of the aeration pipe 17 is provided with aeration holes 18 arranged in a combined manner, and the other end is connected with a fan or a gas steel cylinder.
The using method for measuring the sediment oxygen absorption rate based on the closed pipeline sediment simulation device comprises the following steps:
Step A: placing sediment to be tested into the pipeline reactor 2, and covering a sealing plate 13;
And (B) step (B): through said separate water inlet 22, a water flow containing the specific nutrients required for deposit growth is injected into the device. Opening an oxygen steel bottle or a fan, introducing oxygen or air into the water tank 1 through the aeration pipe 17, and simultaneously opening the air release pipe 23;
Step C: after aeration for 10-30min, the oxygen concentration in the circulating water is saturated, an oxygen steel cylinder or a fan, an independent water inlet 22 and a deflation pipe 23 are closed, an internal circulating water pump 14 is opened, and the water flow is regulated by the inclination angle of an angle regulating mechanism, so that the circulating water circularly flows between the water tank 1 and the pipeline reactor 2;
step D: after circulating for a certain time, measuring the oxygen content in the circulating water at intervals, and drawing an oxygen absorption curve.
In the experiment, the inclination angle of the angle adjusting mechanism is adjusted to enable the pipeline reactor 2 to have a smaller gradient, so that water flow slowly flows through sediment, and flushing of the sediment by the water flow is reduced.
An experimental method for carrying out an influence experiment of erosion resistance of different sediments under anaerobic conditions based on the closed pipeline sediment simulation device comprises the following steps:
step A: placing sediment to be tested into the pipeline reactor 2, covering a sealing plate 13, and installing a filter membrane 7 in the water tank 1;
and (B) step (B): opening a nitrogen steel bottle, introducing nitrogen into the water tank 1 through the aeration pipe 17, and simultaneously opening the air release pipe 23 to remove oxygen in the device;
Step C: after aeration for 10-30min, closing the gas steel cylinder, the independent water inlet 22 and the air release pipe 23, opening the internal circulating water pump 14, and adjusting the water flow size through the inclination angle of the angle adjusting mechanism to enable circulating water to circularly flow between the water tank 1 and the pipeline reactor 2;
Step D: after a certain period of circulating flow, the filter membrane 7 in the water tank 1 was taken out and weighed to determine the deposit anti-scour properties under the experimental conditions.
The foregoing is merely a preferred embodiment of the present invention and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the present invention, which are intended to be comprehended within the scope of the present invention.
Claims (3)
1. The experimental method of the closed pipeline sediment simulation experiment device is characterized by comprising a water tank (1), a pipeline reactor (2) arranged right above the water tank (1) through an angle adjusting mechanism and a circulating pipeline for communicating the water tank (1) with the pipeline reactor (2), wherein:
the pipeline reactor (2) comprises a circular pipeline for containing sediment, sealing plates (13) are arranged at two ends of the circular pipeline, a water inlet (3) and a water outlet (4) are respectively formed in the sealing plates, and an independent water inlet (22) and an independent air release pipe (23) are further arranged on the sealing plates (13);
the water tank (1) is a sealed water tank, a water inlet port (5) is formed in the side wall of the water tank (1), an aerator pipe (17) is arranged in the water tank (1), a filter membrane (7) for filtering water passing through the water inlet port (5) and collecting filtered matters is arranged in the water tank (1), and the filter membrane (7) is detachably assembled in the water tank (1);
The circulating pipeline comprises an inner circulating water pump (14) arranged in the water tank (1), a water inlet pipe (15) with one end connected to the inner circulating water pump (14) and the other end connected with the water inlet (3), and a water outlet pipe (16) communicated with the water outlet (4) and the water inlet port (5);
The experimental method comprises the following steps:
Step A: placing sediment to be tested or cultivated into the pipeline reactor (2), and covering a sealing plate (13);
And (B) step (B): introducing nitrogen, oxygen or air into the water tank (1) through the aeration pipe (17), and simultaneously opening the air release pipe (23);
Step C: after aeration is completed, the air source, the independent water inlet (22) and the air release pipe (23) are closed, the internal circulating water pump (14) is opened, and the water flow is regulated to enable circulating water to circularly flow between the water tank (1) and the pipeline reactor (2);
Step D: after a predetermined period of circulating flow, the oxygen content in the circulating water is measured, an oxygen absorption curve is drawn, or the filter membrane (7) in the water tank (1) is taken out and weighed to determine the sediment scour resistance under anaerobic conditions.
2. The experimental method according to claim 1, characterized in that one end of the aeration pipe (17) is provided with aeration holes (18) which are arranged in combination, and the other end is connected with a fan or a gas steel cylinder.
3. The method according to claim 1, characterized in that the angle adjustment mechanism comprises two symmetrically arranged height adjustment members comprising a cross plate (19) arranged on the water tank (1) for carrying the pipe reactor (2) and a height adjustment support bar (20) arranged between the pipe reactor (2) and the cross plate (19).
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| CN112920945A (en) * | 2021-01-27 | 2021-06-08 | 华东交通大学 | Intelligent simulation device for microbial growth of domestic water pipeline in research room |
| CN114675003B (en) * | 2022-03-21 | 2023-09-05 | 中建三局绿色产业投资有限公司 | Experimental device for researching starting and scouring rate of municipal sewage sediment |
| CN115420659A (en) * | 2022-08-11 | 2022-12-02 | 中建三局绿色产业投资有限公司 | Device for researching sedimentation and scouring characteristics of suspended particles in urban sewage pipeline |
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