CN113018921A - Strong rotational flow forming device in limited fall - Google Patents
Strong rotational flow forming device in limited fall Download PDFInfo
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- CN113018921A CN113018921A CN202110217431.3A CN202110217431A CN113018921A CN 113018921 A CN113018921 A CN 113018921A CN 202110217431 A CN202110217431 A CN 202110217431A CN 113018921 A CN113018921 A CN 113018921A
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- horizontal pipe
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D21/00—Separation of suspended solid particles from liquids by sedimentation
- B01D21/26—Separation of sediment aided by centrifugal force or centripetal force
- B01D21/262—Separation of sediment aided by centrifugal force or centripetal force by using a centrifuge
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/20—Hydro energy
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Abstract
The invention discloses a strong rotational flow forming device in a limited fall, which comprises a horizontal pipe, wherein the horizontal pipe is arranged at the lower part of a section of a water diversion channel where sediment deposition is easy to occur, a rotation starting chamber is arranged between the horizontal pipe and the water diversion channel for communication, one end of the horizontal pipe is provided with a vent pipe, and the other end of the horizontal pipe is closed. The invention has simple structure, no rotating part and no problem of frequently replacing easily damaged components, and the invention independently sets the sand discharge pipeline, has low maintenance cost, high separation efficiency, short treatment time and sustainability, and is efficient and economic channel bottom impurity removal equipment.
Description
Technical Field
The invention belongs to the technical field of canal system pollution discharge, and relates to a strong rotational flow forming device in a limited fall.
Background
In the primary treatment process of a sewage treatment plant, a great amount of silt, impurities and flocculates exist in water flow, and are easy to deposit at the bottom of a channel when the flow rate is low, so that the cost for removing the granular impurities is high, and the method is also an important reason for high sewage treatment cost. In a diversion canal of a diversion power station or a channel in front of a pump station forebay, suspended and pushed sediment in water flow can be deposited at the bottom of a pool and a channel after the flow velocity of the water flow is reduced, so that sediment is deposited. And a step lift irrigation project is built on a river containing a large amount of silt, and after a pump station front pool is arranged, part of water flow containing silt enters a pump, so that the volume weight of water is increased, the flow is reduced, the efficiency of the pump is reduced, and an overflowing part is abraded and damaged. The sediment is usually deposited by a sedimentation tank or a grit chamber, but with the increase of the sum of water demands of industrial and agricultural production, the water diversion ratio of a channel is continuously improved, the contradiction between high water demand and high sand discharge water consumption of the grit chamber is gradually highlighted, and a feasible technology must be adopted to solve the contradiction. Meanwhile, in practical engineering, due to the limitation of terrain and other reasons, a sediment discharge pipe with a large fall is difficult to arrange, the flow velocity of water containing a large amount of sediment at the bottom of a channel is insufficient, and the sediment is difficult to discharge, so that the sediment is deposited in the discharge pipe. How to separate the water flow containing high concentration sediment from the main flow in a limited fall and discharge the sediment by increasing the flow velocity of the water flow is a topic worth studying.
Disclosure of Invention
The invention aims to provide a strong rotational flow forming device in a limited fall, which solves the problem of separating water flow containing high-concentration sediments from a main flow in the limited fall.
The invention adopts the technical scheme that the strong rotational flow forming device in the limited fall comprises a horizontal pipe, wherein the horizontal pipe is arranged at the lower part of the section of a water diversion channel where sediment deposition is easy to occur, a rotation starting chamber is arranged between the horizontal pipe and the water diversion channel for communication, one end of the horizontal pipe is closed and is provided with a vent pipe, and the other end of the horizontal pipe is open.
The invention is also characterized in that:
the horizontal pipe is communicated with the atmosphere through a vent pipe, the axis of the horizontal pipe and the length direction of the channel form an alpha angle, the value range of the alpha angle is 30-90 degrees, and the value range is generally 60 degrees.
The water diversion channel start-up chamber is of a direct cutting structure, one side wall surface of the start-up chamber is downward plumb and tangent with the horizontal pipe, and the other side wall surface of the start-up chamber is downward contracted and intersected with the horizontal pipe.
The length of the vent pipe in the horizontal pipe is consistent with the width of the channel inlet, and the other section of the vent pipe extends out of the horizontal pipe and is vertically communicated with the atmosphere after a certain distance.
The diameter of the horizontal pipe is D, and the diameter of the vent pipe is 1/5-1/2D.
The invention has the beneficial effects that:
(1) in the strong rotational flow forming device in the limited fall provided by the invention, the water flow containing high-concentration sediments vertically enters the rotating chamber under the action of gravity, so that the device is suitable for channels with any height and any gradient.
(2) The invention designs the swirling chamber at the bottom of the channel, and when water flows, the water with lower flow rate and higher sediment content at the bottom falls into the swirling chamber under the action of gravity, so that the impurities are prevented from being deposited at the bottom of the channel.
(3) After the breather pipe is arranged in the horizontal pipe, gas enters the horizontal pipe through the breather pipe, the pressure intensity in the middle section of the horizontal pipe can be effectively reduced, the pressure intensity difference between the channel inlet and the middle section of the horizontal pipe is increased, and the flow velocity of water flow in the horizontal pipe is increased.
(4) Set up the breather pipe in the horizontal pipe, effectively reduced the flow area of horizontal pipe anterior segment, can form the cavity whirl behind the horizontal pipe back end after setting up the breather pipe simultaneously, effectively reduced the flow area of horizontal pipe back end, consequently increased the rivers velocity of flow in the horizontal pipe under the same water consumption condition, and help forming stable rotatory rivers, make rivers carry the ability of deposit stronger, avoided the deposit of deposit in the horizontal pipe.
Drawings
FIG. 1 is a front view of a strong vortex forming device within a limited fall of the present invention;
FIG. 2 is a top view of a strong vortex forming device within a limited fall of the present invention;
in the figure, 1 is a horizontal pipe, 2 is a swirling chamber, 3 is a breather pipe, and 4 is a water diversion channel.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
A strong rotational flow forming device in a limited fall structurally comprises a horizontal pipe 1, wherein the horizontal pipe 1 is arranged at the lower part of a section of a water diversion channel 4 where sediment deposition easily occurs, one end of the horizontal pipe 1 is closed and provided with a vent pipe 3, and the other end of the horizontal pipe 1 is open.
The horizontal pipe 1 is communicated with the atmosphere through the vent pipe 3, the axis of the horizontal pipe 1 and the length direction of the channel form an alpha angle, the value range of the alpha angle is 30-90 degrees, and the value range is generally 60 degrees.
The spiral starting chamber 2 is of a straight-cut structure, one side wall surface of the spiral starting chamber 2 is vertical downwards and tangent to the horizontal pipe 1, and the other side wall surface is contracted downwards and intersected with the horizontal pipe 1.
The length of one section of the air pipe 3 positioned in the horizontal pipe 1 is consistent with that of the channel inlet, and the other section of the air pipe 3 extends out of the horizontal pipe 1.
The diameter of the horizontal pipe 1 is D, and the diameter of the vent pipe 3 is 1/5-1/2D.
The invention relates to a strong rotational flow forming device in a limited fall, which has the following working principle:
the invention relates to a strong rotational flow forming device in a limited fall, which utilizes the characteristic that the concentration of sediments in water flow at the bottom of a water guide channel 4 is high, a horizontal pipe 1 is arranged in a certain fall range (the flow rate is larger when the fall is larger) at the lower part of a cross section of the water guide channel 4 where the sediments are easy to deposit, and a direct cutting type spin-starting chamber is arranged between the water guide channel 4 and the horizontal pipe 1, namely the flow area is gradually reduced from the bottom of the water guide channel 4 to the horizontal pipe 1. When water flow enters the swirling chamber 2 at a certain pressure and initial speed in the tangential direction, the water flow is forced to turn under the constraint of the closed end of the horizontal pipe 1, and axial flow is formed in the horizontal pipe 1 under the action of axial pressure difference. After the vent pipe 3 is arranged, gas enters the horizontal pipe 1 through the vent pipe 3, so that the pressure in the middle section of the horizontal pipe 1 is effectively reduced, the pressure difference between the channel inlet and the middle section of the horizontal pipe 1 is increased, and the flow velocity of water flow in the horizontal pipe 1 is increased; simultaneously add breather pipe 3 in the horizontal pipe 1, effectively reduced the area of overflowing of 1 anterior segment of horizontal pipe, set up simultaneously and can form the cavity whirl behind the horizontal pipe 1 back end behind breather pipe 3, effectively reduced the area of overflowing of 1 back end of horizontal pipe to the rivers velocity of flow in the horizontal pipe 1 has been increased. The high-flow-rate rotational flow motion has the characteristics of strong entrainment capacity and energy concentration, for example, a strong rotational flow forming device is arranged at a position where sediment deposition is easy to occur at the bottom of the water diversion channel at a certain angle, so that not only can high-concentration sediment at the bottom of the channel be separated from main flow, but also the sediment is discharged out of the horizontal pipe 1 under the strong turbulent action of the rotational flow, and the sediment is prevented from being deposited in the horizontal pipe 1.
The invention relates to a strong rotational flow forming device in a limited fall, which has the beneficial effects that:
1. in the water flow speed increasing device in the limited fall, the water flow containing high-concentration sediments enters the cyclone chamber vertically due to the fall between the channel and the cyclone chamber, so that the water flow speed increasing device is suitable for most channels.
2. After the vent pipe is arranged in the horizontal pipe, gas enters the horizontal pipe through the vent pipe, so that the pressure in the middle section of the horizontal pipe can be effectively reduced, the pressure difference between the channel inlet and the middle section of the horizontal pipe is increased, and the flow velocity of water flow in the horizontal pipe is increased;
3. set up the breather pipe in the horizontal tube, effectively reduced the flow area of horizontal hole anterior segment, can form the cavity whirl behind the horizontal tube back end after setting up the breather pipe simultaneously, effectively reduced the flow area of horizontal hole back end, consequently increased the rivers velocity of flow in the horizontal tube under the same water consumption condition, and help forming stable rotatory rivers, make rivers carry the ability of deposit stronger, avoided the deposit of deposit in the horizontal tube.
4. The structure is simple, no rotating part is arranged, and the problem of frequent replacement of a vulnerable component is avoided;
5. the sand discharge pipeline is independently arranged, so that the maintenance cost is low, the separation efficiency is high, the processing time is short, the sustainability is realized, and the device is efficient and economic for removing impurities at the bottom of the channel.
Example 1
The method comprises the following steps of setting the width of a water diversion channel to be 30cm, the height of the water diversion channel to be 40cm, the inlet width of a contraction section to be 10cm, the outlet width of the contraction section to be 3.5cm, the diameter of a horizontal pipe 1 to be 7cm, the diameters of a vent pipe 3 and a solid pipe to be 2cm, and the average inlet speed of the water diversion channel to be 0.5m/s, carrying out numerical simulation on a strong rotational flow forming device in a limited fall by using commercial software Fluent, setting the horizontal pipe 1 to be hollow, setting the vent pipe 3 to the edge of the channel in the horizontal pipe 1, setting the solid pipe to the edge of the channel in the horizontal pipe 1, and setting a through solid pipe in the horizontal pipe 1. The sand discharge water consumption rate is one of important indexes for measuring the performance of the strong rotational flow forming device in the limited fall, and the sand discharge water consumption rate of the scheme of the vent pipe arranged to the edge of the channel in the horizontal pipe is obtained by comparing the sand discharge water consumption rates of different embodiments.
TABLE 1 Sand and Water consumption Rate for different solutions
The flow state, the flow speed and the distribution range of the flow state and the flow speed in the horizontal 1 pipe are important references for measuring the acceleration effect of the strong rotational flow forming device in the limited fall. By comparing the flow velocity vector diagrams of the four embodiments, the horizontal tube 1 is a hollow scheme, the maximum flow velocity of the horizontal tube 1 is smaller in all the schemes, and the high flow velocity area in the horizontal tube 1 is smaller in range; the scheme flow state of the vent pipe arranged to the edge of the channel in the horizontal pipe 1 is most stable, the maximum flow rate is similar to the scheme I and the scheme III, and the range of a high-flow-rate area in the horizontal pipe 1 is the maximum; the maximum flow velocity of the solid pipe arranged to the channel edge in the horizontal pipe 1 is similar to that of the first two schemes, and the range of the high flow velocity area in the horizontal pipe 1 is larger than that of the first scheme and the fourth scheme, and is only second to the second scheme; the through solid pipe arranged in the horizontal pipe 1 has the best acceleration effect in the horizontal pipe 1 due to the smallest outlet section area, and the high flow velocity area range in the horizontal pipe is small.
The comprehensive sand-discharging water consumption rate, the flow state, the flow speed and the distribution range in the horizontal pipe, the scheme II: the air pipe arranged in the horizontal pipe to the edge of the channel is an optimal scheme, and the scheme is four: solid tubes running through the horizontal tubes are used as an alternative.
Claims (5)
1. The strong rotational flow forming device in the limited fall is characterized by comprising a horizontal pipe (1), wherein the horizontal pipe (1) is arranged at the lower part of a section of a water diversion channel, which is easy to deposit sediment, a rotation starting chamber (2) is arranged between the horizontal pipe (1) and the water diversion channel for communication, one end of the horizontal pipe (1) is provided with a vent pipe (3), and the other end of the horizontal pipe (1) is sealed.
2. A strong swirl creating device within a limited fall according to claim 1 characterised in that the level pipe (1) is connected to the atmosphere through a vent pipe (3), the axis of the level pipe (1) and the length direction of the penstock are at an angle α, said angle α being in the range of 30-90 °, typically 60 °.
3. A strong swirling flow forming device within a limited fall according to claim 1, characterized in that the swirling chamber (2) is of a straight cut type structure, one side wall surface of the swirling chamber (2) is downward vertical and tangent to the horizontal pipe (1), and the other side wall surface is downward contracted and intersected with the horizontal pipe (1).
4. A strong turbulence creating device within a limited fall according to claim 2, characterized in that the aeration pipe (3) is located in one section of the horizontal pipe (1) and has a length corresponding to the width of the channel entrance, and another section of the aeration pipe (3) extends out of the horizontal pipe (1).
5. A strong swirl inducing device within a limited fall according to claim 4 characterised in that the diameter of the horizontal tube (1) is D and the diameter of the aeration tube (3) is 1/5-1/2D.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110217431.3A CN113018921B (en) | 2021-02-26 | 2021-02-26 | Strong rotational flow forming device in limited fall |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110217431.3A CN113018921B (en) | 2021-02-26 | 2021-02-26 | Strong rotational flow forming device in limited fall |
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| Publication Number | Publication Date |
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| CN113018921A true CN113018921A (en) | 2021-06-25 |
| CN113018921B CN113018921B (en) | 2022-06-03 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202110217431.3A Active CN113018921B (en) | 2021-02-26 | 2021-02-26 | Strong rotational flow forming device in limited fall |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20090020466A1 (en) * | 2007-07-20 | 2009-01-22 | Gregory Richard Williams | Separator Tank |
| CN201823617U (en) * | 2010-10-22 | 2011-05-11 | 重庆大学 | Cyclone desander with central air guide pipe |
| CN105369769A (en) * | 2015-12-09 | 2016-03-02 | 西华大学 | Sediment removal system and method for preventing sediment accumulation at canal bed of canal and |
| CN107413085A (en) * | 2016-05-23 | 2017-12-01 | 中石化洛阳工程有限公司 | A kind of online desanding device of oil-gas pipeline |
| CN108458252A (en) * | 2018-03-29 | 2018-08-28 | 四川省宏茂环保咨询有限公司 | A kind of anti-deposition pipe-line equipment of sewage disposal |
| CN111074859A (en) * | 2019-12-18 | 2020-04-28 | 兰州理工大学 | Rotational flow sand discharging device and rotational flow sand discharging channel |
| CN111270657A (en) * | 2020-02-04 | 2020-06-12 | 新疆农业大学 | Sand discharge funnel |
-
2021
- 2021-02-26 CN CN202110217431.3A patent/CN113018921B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20090020466A1 (en) * | 2007-07-20 | 2009-01-22 | Gregory Richard Williams | Separator Tank |
| CN201823617U (en) * | 2010-10-22 | 2011-05-11 | 重庆大学 | Cyclone desander with central air guide pipe |
| CN105369769A (en) * | 2015-12-09 | 2016-03-02 | 西华大学 | Sediment removal system and method for preventing sediment accumulation at canal bed of canal and |
| CN107413085A (en) * | 2016-05-23 | 2017-12-01 | 中石化洛阳工程有限公司 | A kind of online desanding device of oil-gas pipeline |
| CN108458252A (en) * | 2018-03-29 | 2018-08-28 | 四川省宏茂环保咨询有限公司 | A kind of anti-deposition pipe-line equipment of sewage disposal |
| CN111074859A (en) * | 2019-12-18 | 2020-04-28 | 兰州理工大学 | Rotational flow sand discharging device and rotational flow sand discharging channel |
| CN111270657A (en) * | 2020-02-04 | 2020-06-12 | 新疆农业大学 | Sand discharge funnel |
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| CN113018921B (en) | 2022-06-03 |
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