CN101934160A - Netted rope-combing sedimentation tank - Google Patents
Netted rope-combing sedimentation tank Download PDFInfo
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- CN101934160A CN101934160A CN 201010279928 CN201010279928A CN101934160A CN 101934160 A CN101934160 A CN 101934160A CN 201010279928 CN201010279928 CN 201010279928 CN 201010279928 A CN201010279928 A CN 201010279928A CN 101934160 A CN101934160 A CN 101934160A
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- nettle
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Abstract
The invention belongs to the technical field of the process for treatment in water supply and drainage, particularly the treatment of sediment in water supply and drainage projects, more particularly a netted rope-combing sedimentation tank comprising a sedimentation tank, wherein flow-homogenizing netted ropes are arranged on the cross-section of the water inlet at the front end of the sedimentation tank; N ways of front netted ropes are arranged behind the flow-homogenizing netted ropes at the front end of the sedimentation tank; pyramidal collecting hoppers are respectively arranged at the bottom of the sedimentation tank between the flow-homogenizing netted ropes and a first layer of front netted ropes and between two adjacent layers of front netted ropes, and discharging pipes are mounted at the bottom of the pyramidal collecting hoppers; and the sedimentation tank is generally provided with four layers of front netted ropes, and 1 to 2 layers of middle netted ropes are arranged on the cross-section of the middle part of the sedimentation tank. By substituting the flow-homogenizing netted ropes for a water-inlet perforated wall at the front end of the sedimentation, the invention can reduce the construction cost by 10% and reduce the energy consumption by 30%; by adding the front netted ropes to the sedimentation area at the front part of the sedimentation tank, the invention can increase the capacity utilization coefficient of the sedimentation tank by more than 10%; and by adding the middle netted ropes to the middle part of the sedimentation tank, the invention can effectively prevent the sedimentation tank from being affected by turbulent burst and other natural factors and improve the operating efficiency of the sedimentation tank.
Description
Technical field
The invention belongs to feedwater and drainage position science and engineering technology field, the particularly feedwater and the precipitation process of drainage system, specifically a kind of nettle is combed sedimentation tank.
Background technology
Precipitation is the important process process that is used for the dried up solid particle of branch, and sedimentation basin extensively adopts in the water treatment of purification of water quality that feeds water and rain sewage.Rectangular sedimentation tank is because of its simple structure, and is cheap, convenient management and bringing into play important effect in the precipitation process of water quality.In general sedimentation basin, for current and entrained solid particle are evenly distributed on the cross section of sedimentation basin, one stifled water inlet perforated wall will be set at the flow inlet place of sedimentation basin, the water inlet perforated wall is generally made of reinforced concrete, but because execution conditions are limit perforation stream scooter 0.3～0.5m/s.So not only increased the loss of flood peak of water distribution, and easily made the flco fragmentation, worsened sedimentation effect, also the hydraulic disturbance because of the aperture jet influences deposition efficiency.
It is poor such as flow uniformity that rectangular sedimentation tank also has, and the short circuit trapping phenomena is serious, and sedimentation effect is undesirable, and capacity utilization hangs down inferior shortcoming.
Summary of the invention
At the shortcoming and defect of rectangular sedimentation tank, the technical problem to be solved in the present invention is to provide that a kind of flow uniformity is good, the precipitation nettle that usefulness is good and capacity utilization is high is combed sedimentation tank.
It is as follows that the present invention solves the problems of the technologies described above the technical scheme of being taked: a kind of nettle comb sedimentation tank, comprise sedimentation basin, it is characterized in that: on the flow inlet place cross-section of river of sedimentation basin front end the current-sharing nettle is set, sedimentation basin front end current-sharing nettle back is provided with the anterior nettle in N road, sedimentation basin bottom between the anterior nettle in current-sharing nettle and first road, between the adjacent anterior nettle of twice is respectively equipped with the taper sludge hopper, and discharge pipeline is equipped with in each taper sludge hopper bottom.
Anterior nettle is provided with four roads usually and can satisfies the demand.
Further, on the cross-section of river at sedimentation basin middle part, establish middle part, 1～2 road nettle, to prevent jumping up once more of deposit seed.
The current-sharing nettle that is installed in the sedimentation basin front portion is in order to uniform current.
Applied fluid mechanics principle of the present invention replaces the water inlet perforated wall with the current-sharing nettle, and a lot of nettle is set in rectangular sedimentation tank, way with nettle comb stream, increase Froude number, improve the flow condition of current and the deposition condition of solid particle, make precipitation usefulness be able to whole the lifting.
The research of helping people such as rattan according to Japanese scholar, when the horizontal flow velocity of sedimentation basin was 25mm/s, the jet of water inlet perforated wall influence length, and will to reach 5m far, reduced the service efficiency of sedimentation basin.
The first, use the water inlet perforated wall of present stage instead the current-sharing nettle after, the broken and hydraulic disturbance of flco will obviously reduce;
This is because crossing the water movement of net is a kind of motion of streaming, and its tail does not produce obviously precipitation and disturbs.Compare with the aperture jet of using the water inlet perforated wall, hydraulic loss also can reduce greatly under the identical situation of rectification effect.In general, the about 0.2～0.5m of the hydraulic loss of perforated wall, and the hydraulic loss of current-sharing nettle can be controlled in below the 0.1m.
The second, the anterior nettle in 4 roads that is provided with in the settling zone of sedimentation basin front portion is in order to improve the current situation of sedimentation basin;
For most sedimentation basin, its Reynolds number
Between 4000～20000, belong to turbulent category.Turbulent flow is a kind of vorticla motion at random, and big and small vortex is filling water body.The yardstick of maelstrom can be suitable with the width and the degree of depth of sedimentation basin.Clearly, maelstrom can seethe stirring to the current of sedimentation basin, is unfavorable for the precipitation of suspended particulate, and the volumetric efficiency of sedimentation basin is reduced greatly.Have data to show, the volumetric efficiency of general sedimentation basin is many about in the of 50%, seldom has to surpass 80%, in other words, has 20%～50% sediment space to be far from bringing into play its precipitation removal effect.
After placing nettle on the cross-section of river of sedimentation basin, each grid in the nettle all carries out combing to current, makes vortex behind the nettle be reduced to the magnitude of nettle grid.Referring to Fig. 2: if the length of side width of grid is M, then yardstick and the mesh width M of net back current vortex are the same order of magnitude, and this has just effectively prevented the disturbance of maelstrom to sedimentation basin, thus the volume utilization ratio of raising sedimentation basin.
For verifying this imagination, the inventor tests the hydraulics that adds nettle improvement sedimentation basin.
Test is tracer with the serge blue, and its advantage is that fluidised form is more clear, is convenient to sampling, and colorimetric analysis is also more convenient.The serge blue concentration that test is adopted is 1.74 grams per liters, and one time dosage is 20 milliliters, and the time of adding is 6～7 seconds.
Test is to carry out in the sedimentation basin of horizontal positioned, and running water is introduced into comprehensive blender, and dividing the present invention that do not flow through of two stocks then is nettle comb sedimentation tank and existing common horizontal sedimentation tank, is flowed out by outlet by the volume measurement counter device at last.Tracer from blender by the instantaneous adding of needle tubing and at exit timing acquiring water sample, sampling time be spaced apart 8 seconds, serge blue concentration is measured in the sampling back, and draws out the time dependent distribution curve of tracer concentration such as Fig. 3, and the rate of recovery of serge blue is between 87～100%.
Test with 600 liters/time and 910 liters/time two kinds of flows carried out the mensuration of the time of staying.
Fig. 3 be 910 liters/time distribution curve of tracer in common sedimentation basin and nettle comb sedimentation tank, solid line is the settling curve of nettle comb sedimentation tank, dotted line is the settling curve of common sedimentation basin, as can be seen from the figure, tracer in the theoretical time of staying of time of occurrence, extinction time, peak concentration time, reaction tank in exit and the average actual time of staying of reaction tank is: common sedimentation basin: t
1'=5 ' 15 ", t
2'=8 ', t
p'=5 ' 57 ", T '=6 ' 32 ", t
a'=6 ' 04 "; Nettle comb sedimentation tank: t
1=5 ' 43 ", t
2=7 ' 45 ", t
p=6 ' 13 ", T=6 ' 20 ", t
a=6 ' 15 ".
Draw thus, the peak value surrounding time of nettle comb sedimentation tank is basic identical, illustrates that flow-shape is stable, more approaches desirable sedimentation basin than common sedimentation basin.
Table 1 is the characteristic parameter table of time of staying test.
The characteristic parameter table of table 1 time of staying test
In the table: the theoretical time of staying of T-reactor
The average actual time of staying of ta-reactor
Tp-peak value time corresponding
t
1-tracer is initial time of occurrence in the exit
t
2-tracer is at the exit extinction time
T in the table
1/ T value has reflected the degree that short stream exists, and its value shows more for a short time that short stream is more serious, and test of many times shows the t of common horizontal sedimentation tank
1/ T value illustrate that less than nettle comb sedimentation tank the nettle precipitation is better than common precipitation, will make the improvement greatly of short stream after adding nettle.Learn from showing really: 910 liters of flows/time, the short stream low 11.1% that the short stream that common pond produces produces than the present invention; 600 liters of flows/time; The short stream low 15% that the short stream that common pond produces produces than the present invention.
Tp/T represents the degree that plug-flow exists, the high explanation of this value sedimentation basin has good hydraulic efficiency, compare the tp/T value of the present invention of two kinds of different flows and the tp/T of common horizontal sedimentation tank, the tp/T value of nettle comb sedimentation tank all is higher than the tp/T of common horizontal sedimentation tank, and the tp/T of nettle comb sedimentation tank approaches 1, illustrate that the nettle precipitation near desirable pulling flow type precipitation, has good hydraulic efficiency.The test data of last table shows, add nettle after, hydraulic efficiency can improve more than 10%.
Ta/T is the ratio of the actual time of staying and theoretical time, and promptly so-called volumetric efficiency is a major parameter that characterizes the sedimentation basin hydraulic characteristic, and the weak point that can weigh because of slough and non-uniform flow formation flows and circulation.Test the gained data several times, ta/T value of the present invention is all high than the ta/T value of common horizontal sedimentation tank, and the ta/T of nettle precipitation also approaches 1, illustrate that nettle precipitates to approach desirable pulling flow type sedimentation basin, and very high capacity utilization is arranged.
t
2/ t
1Being the ratio of current time of staying in the pond of the current of minimum flow velocity and Peak Flow Rate, being called the diffusion coefficient of current, reflecting the severity of mixing up of current, also is the sign that there is quantity in the large scale eddy current in the water, the t of nettle comb sedimentation tank
2/ t
1Be lower than the t of common horizontal sedimentation tank
2/ t
1, nettle has been controlled whirlpool body yardstick just, has improved the important symbol of HYDRODYNAMIC CONDITION RELATING TO.The hybrid perturbation fierceness of the high explanation of this value current, the large scale vortex is more, is unfavorable for precipitation.The t of common horizontal sedimentation tank
2/ t
1Value is greater than the t of nettle comb sedimentation tank
2/ t
1Value, this illustrates that also nettle has the effect of control eddy size, can eliminate to be unfavorable for the large scale eddy current that precipitates, makes the proportion increasing of microvovtex body in the distribution of whole whirlpool body.
Can find out obviously that from above discussion these four hydraulic parameters of the present invention all have advantage in different flow, and near desirable plug-flow sedimentation basin, particularly nettle comb sedimentation tank can be with the t of reflection whirlpool body yardstick
2/ t
1Value is controlled on the lower numerical value, and this is the high major reason of nettle comb sedimentation tank efficient.
All there is a common problem in sedimentation basin commonly used at present, and promptly flow uniformity is poor, and the short circuit trapping phenomena is serious, is difficult to precipitation is controlled at comparatively ideal state.Because the big portion of its hydraulic loss of common sedimentation basin commonly used concentrates on boundary vicinity, the speed difference is big on the cross section, and velocity gradient skewness, the maelstrom that forms in the sedimentation basin cause the disturbance on a large scale of current, and be unfavorable to precipitating.
And nettle has carried out " arrangement " to current, and the distribution of current on the cross section is tending towards evenly, and current whenever promptly form a large amount of small whirlpools body by a nettle, has improved the turbulent fluctuation structure of current, has avoided short circuit and delay, for precipitation provides advantage.
In a word, nettle comb sedimentation tank current are even, avoided short circuit and delay, and high capacity utilization is arranged, and good plug-flow situation is arranged, and reached the purpose of efficient precipitation with more excellent hydraulics.
The 3rd, middle part, 1～2 road nettle that is provided with on the cross-section of river at sedimentation basin middle part can prevent jumping up once more of deposit seed;
Modern age, hydrodynamics studies show that, the phenomenon of bursting of turbulent flow will impact solids precipitation, turbulent flow is burst and can be occurred in any time of water movement, and its current that show as low speed fluxion strap at the bottom of the pond can be lifted to the middle part at the bottom of the pond, and the current of middle part hyper tape are mopped up at the bottom of the pond immediately.The lifting of bursting and mopping up at sedimentation basin frequently takes place, and can make jump up once more water body after the clarification of deposit seed, and the precipitation operating mode is damaged.Famous scholar's Sa
Systematic observation rises to the water body middle part to the bottom sediment that reaches 20% under the effect that turbulent flow is burst in flume test, has destroyed sedimentation effect.Add the middle part nettle at the cross-section of river of sedimentation basin, influence and then raising deposition efficiency to precipitation just can reduce to burst.
Horizontal sedimentation tank causes the pond body length longer because of the sedimentation time is long, and the density current that caused by bias current that wind-force causes and density contrast also forms very big the influence to the operating mode of sedimentation basin.The middle part nettle that installs additional has improved the flox condition of sedimentation basin, can obviously reduce the influence of bias current and density current and improves the working condition of sedimentation basin.
The present invention compared with prior art, its outstanding effect is:
1, replaces the water inlet perforated wall at the sedimentation basin front end with the current-sharing nettle and can reduce cost 10%, cut down the consumption of energy 30%.
2, the anterior nettle that adds of the settling zone of sedimentation basin front portion can make the volumetric efficiency of sedimentation basin improve more than 10%.
3, sedimentation basin middle part adds the middle part nettle, prevented effectively that turbulent flow from bursting and other natural cause to the influence of sedimentation basin, improved the task performance of sedimentation basin.
In a word, the nettle that is based upon on the modern fluid mechanics theoretical foundation precipitates the hydraulics that has improved sedimentation basin greatly, replaces and transform existing common horizontal sedimentation tank deposition efficiency will be improved greatly with nettle comb sedimentation tank, saves investment, cuts down the consumption of energy; At the development low-carbon economy, improve and will play a significant role aspect the environment looks.
Description of drawings
Fig. 1 is a structural representation of the present invention,
Fig. 2 is the principle schematic of grid to the current combing,
Fig. 3 for the present invention and common horizontal sedimentation tank tracer test flow be 910 liters/time the tracer distribution curve,
Fig. 4 is the structural representation of current-sharing nettle.
Among the figure: 1-current-sharing nettle, the anterior nettle of 2-, the 201-Di-anterior nettle of Dao, 3-middle part nettle, the 4-sludge hopper, the 5-discharge pipeline,
The specific embodiment
As shown in Figure 1: a kind of nettle comb sedimentation tank, comprise sedimentation basin, it is characterized in that: on the flow inlet place cross-section of river of sedimentation basin front end current-sharing nettle 1 is set, sedimentation basin front end current-sharing nettle 1 back is provided with the anterior nettle 2 in N road, sedimentation basin bottom between the anterior nettle 201 in current-sharing nettle 1 and first road, between adjacent anterior nettle 2 in each road is respectively equipped with taper sludge hopper 4, and discharge pipeline 5 is equipped with in each taper sludge hopper 4 bottom.
For preventing jumping up once more of deposit seed, on the cross-section of river at sedimentation basin middle part, establish middle part, 2 roads nettle 3.
Referring to Fig. 4: current-sharing nettle 1 is mesh-structured as the fishing net shape with polypropylene (PP) woollen yarn knitting, and mesh is generally 5 * 5mm.
The structure of anterior nettle 2 and middle part nettle 3 is identical with current-sharing nettle 1, and just mesh is generally 10 * 10mm to 12 * 12mm.
The height of sedimentation basin water inlet end greater than with the height of sedimentation basin water side, make the silt of sedimentation basin bottom flow to taper sludge hopper 4, discharge from discharge pipeline 5.
Claims (5)
1. a nettle is combed sedimentation tank, comprise sedimentation basin, it is characterized in that: on the flow inlet place cross-section of river of described sedimentation basin front end current-sharing nettle (1) is set, the described current-sharing nettle of described sedimentation basin front end (1) back is provided with the anterior nettle (2) in N road, described sedimentation basin bottom between the anterior nettle in described current-sharing nettle (1) and first road (201), between the adjacent described anterior nettle in each road (2) is respectively equipped with taper sludge hopper (4), and discharge pipeline (5) is equipped with in each described taper sludge hopper (4) bottom.
2. a kind of nettle comb sedimentation tank as claimed in claim 1 is characterized in that: establish middle part, 1～2 road nettle (3) on the cross-section of river at described sedimentation basin middle part.
3. a kind of nettle comb sedimentation tank as claimed in claim 1, it is characterized in that: described anterior nettle (2) is four roads.
4. as any described a kind of nettle comb sedimentation tank of claim 1 to 3, it is characterized in that: described current-sharing nettle (1), described anterior nettle (2) and described middle part nettle (3) are mesh-structured with the polypropylene woollen yarn knitting; The mesh of described current-sharing nettle (1) is 5 * 5mm, and the mesh of described anterior nettle (2) and described middle part nettle (3) is 10 * 10mm to 12 * 12mm.
5. a kind of nettle comb sedimentation tank as claimed in claim 4 is characterized in that: the height of described sedimentation basin water inlet end greater than with the height of described sedimentation basin water side.
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| CN 201010279928 CN101934160A (en) | 2010-09-07 | 2010-09-07 | Netted rope-combing sedimentation tank |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103830940A (en) * | 2014-03-19 | 2014-06-04 | 常州神力热喷涂技术有限公司 | Non-turbulence sediment box |
| CN106925003A (en) * | 2017-05-10 | 2017-07-07 | 扬州大学 | Mixing perforation water distribution tracery wall and its method for rectifying of a kind of water intake pumping station preliminary sedimentation aeration tank |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2303835Y (en) * | 1997-07-25 | 1999-01-13 | 王绍文 | Grid horizontal flow sedimentation tank |
-
2010
- 2010-09-07 CN CN 201010279928 patent/CN101934160A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2303835Y (en) * | 1997-07-25 | 1999-01-13 | 王绍文 | Grid horizontal flow sedimentation tank |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103830940A (en) * | 2014-03-19 | 2014-06-04 | 常州神力热喷涂技术有限公司 | Non-turbulence sediment box |
| CN103830940B (en) * | 2014-03-19 | 2016-02-03 | 常州神力热喷涂技术有限公司 | Without turbulent settling tank |
| CN106925003A (en) * | 2017-05-10 | 2017-07-07 | 扬州大学 | Mixing perforation water distribution tracery wall and its method for rectifying of a kind of water intake pumping station preliminary sedimentation aeration tank |
| CN106925003B (en) * | 2017-05-10 | 2022-05-10 | 扬州大学 | Mixed perforated water distribution tracery wall of pre-settling aeration tank of water intake pump station and rectification method thereof |
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Application publication date: 20110105 |