CN110715134A - Branch pipe for pumped storage power station - Google Patents
Branch pipe for pumped storage power station Download PDFInfo
- Publication number
- CN110715134A CN110715134A CN201910842484.7A CN201910842484A CN110715134A CN 110715134 A CN110715134 A CN 110715134A CN 201910842484 A CN201910842484 A CN 201910842484A CN 110715134 A CN110715134 A CN 110715134A
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- pipe
- rib plate
- crescent rib
- crescent
- power station
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L41/00—Branching pipes; Joining pipes to walls
- F16L41/02—Branch units, e.g. made in one piece, welded, riveted
- F16L41/023—Y- pieces
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L55/00—Devices or appurtenances for use in, or in connection with, pipes or pipe systems
- F16L55/02—Energy absorbers; Noise absorbers
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Other Liquid Machine Or Engine Such As Wave Power Use (AREA)
Abstract
The invention discloses a branch pipe for a pumped storage power station, which comprises a Y-shaped branch pipe, wherein crescent rib plates and two guide plates are arranged in the Y-shaped branch pipe; the Y-shaped branch pipe comprises a main pipe and two branch pipes which are respectively communicated with the main pipe, the crescent rib plates are arranged at the joint interface of the inner cavities of the two branch pipes, each crescent rib plate comprises an inner edge and an outer edge, the inner edges face the water inlet direction of the main pipe, the outer edges are connected with the boundary line of the inner walls of the two branch pipes in a fitting manner, the two guide plates are symmetrically arranged on two sides of the crescent rib plates, one side surfaces of the guide plates facing the water flow are parabolic cylinder surfaces, one ends of the guide plates are connected with the inner wall surfaces of the branch pipes in a fitting manner, and the. The bifurcated pipe for the pumped storage power station can reduce the head loss of the bifurcated pipe part of the pumped storage power station.
Description
Technical Field
The invention relates to the technical field of pumped storage, in particular to a branch pipe for a pumped storage power station.
Background
The pumped storage power station is matched with a thermal power station, a hydropower station and the like for construction, is mainly used for power grid load adjustment and maintenance of power grid operation stability, pumps water from a lower reservoir to an upper reservoir for energy storage by utilizing electric power in the power grid during load valley, and discharges water to return to the lower reservoir for power generation when the power grid is loaded at peak.
The branch pipe is an essential structure for connecting the upper/lower water reservoir of the pumped storage power station with the generator set, and generates large bidirectional head loss due to the structure of the branch pipe in the operation process of the power station, so that the pumped storage power station has low power generation efficiency and large energy consumption of pumped storage, and the generated economic loss is not small or varied.
In recent years, hydropower stations develop towards high water head and high capacity, the requirement on the stability of branch pipe structures is improved, the crescent ribbed steel branch pipe structures are reliable and simple to manufacture, and the traditional three-beam type and welt type branch pipes are gradually replaced. The crescent rib steel bifurcated pipe body type design mainly comprises 3 aspects of arrangement type, bifurcation angle selection and rib width ratio design, and the advantages and disadvantages of the crescent rib steel bifurcated pipe body type design directly relate to the operating efficiency and long-term economic benefit of a power station. The main reason that head loss produces is the local sharp-pointed space that the crescent floor in the middle links to each other with the branch pipe and forms, and rivers form the vortex backward flow region in local sharp-pointed space because inertia striking face backward flow. At present, researchers have analyzed the law of influence of a rib width ratio, a bifurcation angle, a split ratio and the like on the head loss of the crescent rib bifurcated pipe by utilizing a CFD technology, and a basis is provided for optimizing the body type of the bifurcated pipe. However, the changeable space of the rib width ratio, the bifurcation angle and other factors is very small, the head loss reduction effect is not obvious, the construction of the pumped storage power station is in hot tide, the economic loss caused by the bifurcation head loss is not negligible, the existing body type optimization basis is not enough to deal with the loss, and the development and the research need to be continued in the aspect of the body type optimization design of the crescent rib bifurcated pipe, namely the body type of the guide plate bifurcated pipe of the pumped storage power station is provided.
Disclosure of Invention
The invention aims to provide a branch pipe for a pumped storage power station, which can reduce the head loss of the branch pipe part of the pumped storage power station.
The technical scheme adopted by the invention is that the branch pipe for the pumped storage power station comprises a Y-shaped branch pipe, wherein crescent rib plates and two guide plates are arranged in the Y-shaped branch pipe; the Y-shaped branch pipe comprises a main pipe and two branch pipes which are respectively communicated with the main pipe, the crescent rib plates are arranged at the joint interface of the inner cavities of the two branch pipes, each crescent rib plate comprises an inner edge and an outer edge, the inner edges face the water inlet direction of the main pipe, the outer edges are connected with the boundary line of the inner walls of the two branch pipes in a fitting manner, the two guide plates are symmetrically arranged on two sides of the crescent rib plates, one side surfaces of the guide plates facing the water flow are parabolic cylinder surfaces, one ends of the guide plates are connected with the inner wall surfaces of the branch pipes in a fitting manner, and the.
The present invention is also characterized in that,
the parabolic cylinder satisfies the equation:
wherein: theta is an included angle between a ridge bus of the guide plate and the crescent rib plate;
a is the vertical projection length of the intersecting line of the crescent rib plate and the bifurcated pipe shell minus the width of the waist section of the crescent rib plate;
c is the distance between the intersection point O of the axis of the main pipe and the axes of the two branch pipes and the intersection point O' of the chord of the inner edge and the symmetry axis of the inner edge;
b is half of the height of the crescent rib plate.
The inner edge of the crescent rib plate is parabolic, and the equation is satisfied:
wherein: a is the vertical projection length of the intersecting line of the crescent rib plate and the bifurcated pipe shell minus the width of the waist section of the crescent rib plate; b is half of the height of the crescent rib plate.
A plurality of small holes are uniformly distributed on the surface of the guide plate.
The invention has the advantages of reducing the head loss of the branch pipe part of the pumped storage power station, increasing the power generation benefit, reducing the pumping cost and improving the economic benefit of the pumped storage power station.
Drawings
FIG. 1 is a schematic structural diagram of a bifurcated pipe for a pumped storage power station according to the present invention;
FIG. 2 is a drawing showing the dimensions of the crescent rib in the bifurcated pipe of the present invention;
FIG. 3 is an enlarged view of area A of FIG. 1;
FIG. 4 is an enlarged view of area e of FIG. 3;
FIG. 5 is a schematic of the on-way split used in the simulation test validation.
In the figure, 1 is a main pipe, 2 is a branch pipe, 3 is a crescent rib plate, 3-1 is an inner edge, 3-2 is an outer edge, 4 is a guide plate, 5 is a ridge bus and 6 is a cross line of a bifurcated pipe shell.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
The invention provides a Y-shaped branch pipe, which comprises a Y-shaped branch pipe as shown in figures 1-5, wherein a crescent rib plate 3 and two guide plates 4 are arranged in the Y-shaped branch pipe; the Y-shaped branch pipe comprises a main pipe 1 and two branch pipes 2 respectively communicated with the main pipe 1, a crescent rib plate 3 is arranged at a joint interface of inner cavities of the two branch pipes 2, the crescent rib plate 3 comprises an inner edge 3-1 and an outer edge 3-2, the inner edge 3-1 faces the water inlet direction of the main pipe 1, the outer edge 3-2 is in fit connection with an inner pipe wall boundary line of the two branch pipes 2, two guide plates 4 are symmetrically arranged on two sides of the crescent rib plate 3, one side face, facing water flow, of each guide plate 4 is a parabolic cylinder, one end of each guide plate 4 is in fit connection with the inner wall face of each branch pipe 2, and the other end of each guide plate 4 is in fit connection with the inner.
A first spatial rectangular coordinate system is created as shown in fig. 1, 3. The intersection O of the axis of the main pipe 1 and the axes of the two branch pipes 2 is the origin of coordinates, the Z axis is parallel to the ridge bus 5 of the guide plate 4 and points to the branch pipes 2, the X axis is vertical to the Z axis, the xoz plane is the symmetrical plane of the crescent rib plate 3 and the guide plate 4, the Y axis is orthogonal to the Z axis and the X axis, and the surface of the ejected paper is the positive direction. (the diversion plate ridge generatrix 5 is the intersection line of the plane formed by the main pipe axis and the branch pipe axis of the branch pipe and the diversion plate curved surface)
The guide plate 4 is a parabolic cylinder with a generatrix parallel to the z-axis and a quasi-line being a parabola under the first rectangular space coordinate system.
The parabolic cylinder satisfies the equation:
wherein: theta is an included angle between a ridge bus 5 of the guide plate 4 and the crescent rib plate 3;
a is the vertical projection length of the intersecting line of the crescent rib plate 3 and the bifurcated pipe shell minus the width of the waist section of the crescent rib plate 3;
c is the distance between the intersection point O of the axis (FO) of the main pipe 1 and the axes (OG, OH) of the two branch pipes 2 and the intersection point O' of the chord of the inner edge 3-1 and the symmetry axis of the inner edge 3-1;
b is half the height of the crescent rib plate 3.
A second planar orthogonal coordinate system is created as shown in fig. 2 and 4. The intersection O ' of the chord of the inner edge 3-1 of the crescent rib plate 3 and the symmetrical axis (O ' X ') of the inner edge 3-1 is the origin of coordinates;
the inner edge 3-1 of the crescent rib plate 3 satisfies the equation:
wherein: a is the vertical projection length of the intersecting line of the crescent rib plate 3 and the bifurcated pipe shell minus the width of the waist section of the crescent rib plate 3; b is half the height of the crescent rib plate 3.
A plurality of small holes are uniformly distributed on the surface of the guide plate 4. The guide plate 4 mainly has the function of changing the flow state of water flow in the bifurcated pipe and has small thickness, so small holes with the diameter of 5mm are uniformly distributed on the plate surface and are used for balancing the water pressure at two sides of the guide plate.
The working principle is as follows: the guide plate 4 provided by the invention seals a sharp region at the junction of the crescent rib plate 3 and the branch pipe 2, and is attached to the inner edge 3-1 of the crescent rib plate 3 and the inner wall surface of the branch pipe 2. When the diversion function is played, water is separated from the middle, and directly flows into the branch pipe 2 along the smooth transition of the guide plate 4 surface, so that the vortex backflow area is reduced, the water flow state is improved, and the water head loss is reduced. When the confluence function is performed, water is converged from the two branch pipes 2 to the main pipe 1, the guide plate 4 smoothly introduces the water into the main pipe 1 from the branch pipes 2, the impact formed by the water flow impacting on the crescent rib plate surface is weakened, and the backflow formed inside the water body is avoided.
And (3) simulation test verification:
establishing two three-dimensional models in the CATIA, wherein one model is an original branch pipe model without a guide plate, and the other model is the branch pipe model with the guide plate, and the model proportion is 1: 1; the on-way split flow diagram used in the simulation test validation is shown in fig. 5;
introducing ANSYS to perform fluid numerical simulation after the model is built, wherein the flow rate of a water inlet is selected from 4m/s, 5m/s and 6m/s, outputting a solving result to obtain the flow rate of the inlet, the pressure intensity of the inlet, the flow rate of the outlet and the pressure intensity of the outlet, and solving the head loss at the branch pipe by using a Bernoulli equation, wherein the formula is as follows:
in the formula: z is the height of the position, this simulation z1＝z2＝z3；
P is the average pressure of the section;
v is the average speed of the section;
hw1-2head loss is 1-1 section and 2-2 section;
hw1-3head loss for sections 1-1 and 3-3.
The branch head loss calculation results are as follows:
TABLE 1 Power Generation Condition head loss Change Meter
TABLE 2 Water-pumping working condition head loss variation table
As can be seen from tables 1-2, the branch pipe with the additional flow guide plate can reduce the local head loss of the branch pipe part in the operation process of the pumped storage power station compared with the traditional branch pipe.
Taking a certain pumped storage power station as an example, the economic flow rate of the power station is 5m/s, the original body type has no guide plate, the head loss of the branch pipe section under the water pumping working condition is 63.6cm, the head loss of the power generation working condition is 44.3cm, and the power generation sales income of the design year is 151767 ten thousand yuan; if the branch pipe is adopted, the head loss of the branch pipe can be reduced by 29.62% under the working condition of pumping water, the head loss of the branch pipe can be reduced by 12.43% under the working condition of power generation, only 40 ten thousand yuan is needed to be added to the guide plate at the initial stage of the power station, the annual power generation sales income can be increased by 153 ten thousand yuan, and the economic benefit is obviously improved.
The invention has the advantages that: compared with the traditional branch pipe, the branch pipe additionally provided with the guide plate can reduce the local head loss of the branch pipe part and increase the economic benefit of the pumped storage power station in the operation process of the pumped storage power station, can reduce the water pressure on the crescent rib plates, protects the rib plates from being washed away, and prolongs the service life of the branch pipe in the pumped storage power station. The guide plates are additionally arranged on the two sides of the crescent rib plates, so that the water head loss can be reduced, the manufacturing process is simple and convenient, and the water-storage power station has wide popularization and practical values in the project construction process of the water-storage power station.
Claims (4)
1. A bifurcated pipe for a pumped storage power station is characterized by comprising a Y-shaped bifurcated pipe, wherein a crescent rib plate (3) and two guide plates (4) are arranged in the Y-shaped bifurcated pipe; the Y-shaped branch pipe comprises a main pipe (1) and two branch pipes (2) which are respectively communicated with the main pipe (1), the crescent rib plate (3) is arranged at a joint interface of inner cavities of the two branch pipes (2), the crescent rib plate (3) comprises an inner edge (3-1) and an outer edge (3-2), the inner edge (3-1) faces towards the water inlet direction of the main pipe (1), the outer edge (3-2) is connected with an inner pipe wall boundary line of the two branch pipes (2) in an attaching mode, the two guide plates (4) are symmetrically arranged on two sides of the crescent rib plate (3), one side face, facing water flow, of each guide plate (4) is a parabolic cylinder, one end of each guide plate (4) is connected with the inner wall face of the corresponding branch pipe (2) in an attaching mode, and the other end of each guide plate (4) is connected with the inner edge (3-1).
2. The bifurcated pipe for pumped-storage power station of claim 1, wherein said parabolic cylinder satisfies the equation:
wherein: theta is an included angle between a ridge bus (5) of the guide plate (4) and the crescent rib plate (3);
a is the vertical projection length of the intersecting line (6) of the crescent rib plate (3) and the bifurcated pipe shell minus the waist section width of the crescent rib plate (3);
c is the distance between the intersection point O of the axis of the main pipe (1) and the axes of the two branch pipes (2) and the intersection point O' of the chord of the inner edge (3-1) and the symmetry axis of the inner edge (3-1);
b is half of the height of the crescent rib plate (3).
3. The branch pipe for pumped storage power stations according to claim 2, characterized in that the inner edge (3-1) of the crescent rib plate (3) is parabolic, satisfying the equation:
wherein: a is the vertical projection length of the intersecting line (6) of the crescent rib plate (3) and the bifurcated pipe shell minus the waist section width of the crescent rib plate (3); b is half of the height of the crescent rib plate (3).
4. The bifurcated pipe for the pumped storage power station as claimed in claim 1, wherein the plate surface of the guide plate (4) is uniformly distributed with a plurality of small holes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910842484.7A CN110715134A (en) | 2019-09-06 | 2019-09-06 | Branch pipe for pumped storage power station |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910842484.7A CN110715134A (en) | 2019-09-06 | 2019-09-06 | Branch pipe for pumped storage power station |
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| CN110715134A true CN110715134A (en) | 2020-01-21 |
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| CN201910842484.7A Pending CN110715134A (en) | 2019-09-06 | 2019-09-06 | Branch pipe for pumped storage power station |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111541204A (en) * | 2020-04-29 | 2020-08-14 | 国网河北省电力有限公司保定供电分公司 | Underground branch wiring pipe of buried line |
| CN112594470A (en) * | 2020-12-16 | 2021-04-02 | 中国电建集团昆明勘测设计研究院有限公司 | Method for arranging crescent rib bifurcated pipe stiffening beam |
| CZ308857B6 (en) * | 2020-05-15 | 2021-07-14 | České vysoké učení technické v Praze | Economical fitting for connecting two pressure pipes to one outlet pipe |
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| JPH11287378A (en) * | 1998-04-03 | 1999-10-19 | Kurimoto Ltd | Branch pipe |
| CN102853193A (en) * | 2012-09-24 | 2013-01-02 | 武汉大学 | Flat steel bifurcated pipe and manufacturing method thereof |
| CN205000310U (en) * | 2015-06-19 | 2016-01-27 | 中国电建集团华东勘测设计研究院有限公司 | Reinforced concrete bifurcated pipe of reposition of redundant personnel crotch portion belted steel lining |
| CN206233202U (en) * | 2016-11-24 | 2017-06-09 | 中国电建集团贵阳勘测设计研究院有限公司 | A kind of steel bifurcated deflector structure |
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2019
- 2019-09-06 CN CN201910842484.7A patent/CN110715134A/en active Pending
Patent Citations (4)
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| JPH11287378A (en) * | 1998-04-03 | 1999-10-19 | Kurimoto Ltd | Branch pipe |
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| CN205000310U (en) * | 2015-06-19 | 2016-01-27 | 中国电建集团华东勘测设计研究院有限公司 | Reinforced concrete bifurcated pipe of reposition of redundant personnel crotch portion belted steel lining |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111541204A (en) * | 2020-04-29 | 2020-08-14 | 国网河北省电力有限公司保定供电分公司 | Underground branch wiring pipe of buried line |
| CN111541204B (en) * | 2020-04-29 | 2021-05-28 | 国网河北省电力有限公司保定供电分公司 | Underground branch wiring pipe of buried line |
| CZ308857B6 (en) * | 2020-05-15 | 2021-07-14 | České vysoké učení technické v Praze | Economical fitting for connecting two pressure pipes to one outlet pipe |
| EP3910226A1 (en) * | 2020-05-15 | 2021-11-17 | Ceske vysoke uceni technicke v Praze | Economical fitting connecting two pressure pipelines into one outlet pipeline |
| CN112594470A (en) * | 2020-12-16 | 2021-04-02 | 中国电建集团昆明勘测设计研究院有限公司 | Method for arranging crescent rib bifurcated pipe stiffening beam |
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Application publication date: 20200121 |