CN113216105A - Semi-gravity drainage system of pumped storage power station and control method - Google Patents
Semi-gravity drainage system of pumped storage power station and control method Download PDFInfo
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- CN113216105A CN113216105A CN202110465343.5A CN202110465343A CN113216105A CN 113216105 A CN113216105 A CN 113216105A CN 202110465343 A CN202110465343 A CN 202110465343A CN 113216105 A CN113216105 A CN 113216105A
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- 238000000034 method Methods 0.000 title claims abstract description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 166
- 230000005484 gravity Effects 0.000 claims abstract description 17
- 238000007667 floating Methods 0.000 claims description 14
- 239000007788 liquid Substances 0.000 claims description 11
- 238000012423 maintenance Methods 0.000 claims description 10
- 238000004891 communication Methods 0.000 claims description 6
- 229910000831 Steel Inorganic materials 0.000 claims description 4
- 239000010959 steel Substances 0.000 claims description 4
- 238000007789 sealing Methods 0.000 claims description 3
- 230000000903 blocking effect Effects 0.000 claims description 2
- 238000009412 basement excavation Methods 0.000 abstract description 2
- 238000005086 pumping Methods 0.000 description 5
- 238000013461 design Methods 0.000 description 3
- 238000005265 energy consumption Methods 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 238000012876 topography Methods 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02B—HYDRAULIC ENGINEERING
- E02B9/00—Water-power plants; Layout, construction or equipment, methods of, or apparatus for, making same
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02B—HYDRAULIC ENGINEERING
- E02B9/00—Water-power plants; Layout, construction or equipment, methods of, or apparatus for, making same
- E02B9/02—Water-ways
- E02B9/06—Pressure galleries or pressure conduits; Galleries specially adapted to house pressure conduits; Means specially adapted for use therewith, e.g. housings, valves, gates
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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
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
- Y02A20/20—Controlling water pollution; Waste water treatment
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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
Abstract
The invention provides a semi-automatic drainage system of a pumped storage power station and a control method thereof. The invention can greatly shorten the excavation length of the gravity drainage tunnel, even modify a plurality of schemes which originally only can use a water pump to pump, overhaul and leak drainage into a semi-gravity drainage scheme, modify the total gravity drainage scheme into the semi-gravity drainage scheme, greatly shorten the length of the gravity drainage tunnel and greatly reduce the investment of a power station.
Description
Technical Field
The invention belongs to the technical field of hydraulic engineering, and particularly relates to a semi-gravity drainage system of a pumped storage power station.
Background
Due to the improvement of the development technology of hydropower, more and more high-water-head hydropower stations and pumped storage power stations are gradually put into use in recent years. In order to avoid cavitation of water in a flow channel of the unit and structural damage to the unit, the installation buried depth of a water turbine (pump turbine) set needs to be correspondingly increased along with the increase of a water head, and the ground elevation of a power generation plant is reduced along with the increase of the water head. The unit installation elevation of a high-head hydropower station (pumped storage power station) is generally lower than the water level of a lower reservoir, and most of plants are arranged underground.
The drainage of the underground workshop is divided into workshop leakage drainage and unit maintenance drainage systems. The drainage system of the underground workshop comprises rock mass leakage water of the underground workshop, unit leakage water and the like, and accumulated water needs to be drained out of a factory through the drainage system. Underground powerhouse leakage drainage system generally has two kinds of modes: 1. if a water outlet with a water outlet level lower than the lowest floor ground elevation of the underground powerhouse is arranged near the power station (for example, within the range of 5km in diameter), a self-flowing water drainage hole can be excavated, and water leakage of the underground powerhouse can automatically flow and drain out of a factory through the water drainage hole; 2. if a proper gravity drainage outlet lower than the ground elevation of the bottom layer of the plant cannot be found near the power station, a water collecting well is generally arranged in the plant to collect leakage water of the underground plant, a deep well drainage pump is arranged in the water collecting well to pump and drain the leakage water to a higher elevation, and then the leakage water is automatically drained out of a factory through a drainage hole. In addition, a maintenance drainage system needs to be arranged in a hydropower station (pumped storage power station), and an underground workshop also has two unit maintenance drainage modes: 1. if the power station is provided with the self-flowing water drainage hole, the bottommost part of the tail water pipe is provided with a water outlet, and accumulated water is introduced into the self-flowing water drainage hole through a pipeline and a valve. 2. If the power station does not have the self-flowing drainage hole, a maintenance drainage pump needs to be arranged on the drainage pipeline, the accumulated water in the flow channel is pumped and drained to a higher elevation, and then the accumulated water is automatically drained out of the factory through the drainage hole.
If underground factory building seepage drainage adopts the water pump drainage mode, need excavate the sump pit to dispose corresponding drain pump and control system, water pump automatic start drainage after the sump pit water level rises to certain elevation, when the water level descends to design low water level, water pump automatic shutdown. The scheme has less one-time investment, but the later-stage overhaul and maintenance engineering quantity of the power station is larger; in addition, in the design life (50 years) of the power station, the energy consumption cost of the drainage equipment is high (for example, the estimated drainage energy consumption cost of a certain installed 1200MW pumping and storage power station can be larger than 5000 ten thousand yuan), in addition, if a water flooding factory accident occurs in the power station, the drainage flow of the factory building is limited by the design flow of the water pump, accumulated water in the factory building cannot be drained quickly, if the water level in the factory building rises to cause the water pump motor or the control equipment to be flooded, the water pump stops running, and the accident cannot be effectively limited from being enlarged. According to the scheme, the automatic drainage tunnel automatically drains water through the drainage gallery without digging a water collecting well or a drainage facility, if a power station has a water leakage accident, accumulated water in a plant can be quickly and effectively drained, the plant accident caused by water flooding of the power station can be effectively avoided or reduced, the risk that drainage equipment fails to drain water is avoided, and the scheme is a preferred mode of an underground plant drainage system. However, due to the limitation of the specific topography of hydropower stations (pumped storage power stations), proper water outlets cannot be found near many power stations or the water outlets are far away from the ground and the plant, and underground drainage galleries of several kilometers or even more than ten kilometers need to be excavated, so that the construction investment once is huge, the economy is relatively poor, and the situation that many power station construction units want to use the self-flowing drainage tunnel scheme but cannot use the scheme is caused.
Therefore, it is urgent to find a safe and reliable drainage scheme for underground plants with relatively low investment.
Disclosure of Invention
The invention aims to provide a semi-gravity drainage system of a pumped storage power station, aiming at the defects in the prior art.
For this reason, the above object of the present invention is achieved by the following technical solutions:
the utility model provides a semi-artesian drainage system of pumped storage power station, semi-artesian drainage system of pumped storage power station includes underground factory building seepage drainage system and unit maintenance drainage system, underground factory building seepage drainage system and unit maintenance drainage system's drainage all converges to artesian drainage hole, arranged work gate, its characterized in that between artesian drainage hole and the low reaches river course: an accident gate is arranged in a space between the working gate and the downstream river channel and is used for falling and blocking the communication between the gravity drainage hole and the downstream river channel when the working gate fails to fall or the seal fails after falling; a water collecting well is arranged in a space between the self-flowing water draining hole and the working gate, and a plurality of submersible pumps are arranged in the water collecting well.
While adopting the technical scheme, the invention can also adopt or combine the following technical scheme:
as a preferred technical scheme of the invention: a first floating ball liquid level switch is arranged in the water collecting well and used for indicating the height information of the water level in the water collecting well
As a preferred technical scheme of the invention: the submersible pump comprises a working pump and a standby pump, wherein the working pump and the standby pump are multiple.
As a preferred technical scheme of the invention: a frame-shaped operating rod is arranged above the emergency gate, one end of the frame-shaped operating rod is provided with a floating ball and is arranged in the water collecting well, the other end of the frame-shaped operating rod is provided with a lock catch, the lock catch is used for hanging the emergency gate in a non-working state, the middle part of the frame-shaped operating rod is provided with a rotating shaft, and the rotating shaft is fixed to the top of a gate chamber of the emergency gate; the frame-shaped operating rod can integrally rotate relative to the rotating shaft so as to slide the lock catch on the operating rod out of the top of the accident gate and drop the accident gate.
As a preferred technical scheme of the invention: the semi-gravity drainage system of the pumped storage power station is also provided with an electric hoist, the electric hoist is fixed to the top of a gate chamber of the accident gate, and the lower end of the electric hoist is fixed to the top of the accident gate through a steel wire.
As a preferred technical scheme of the invention: the working gate is lowered or lifted by a winch.
As a preferred technical scheme of the invention: and a second floating ball liquid level switch is further arranged in the downstream riverway and is used for indicating the height information of the water level in the downstream riverway.
The invention also aims to provide a semi-gravity drainage control method for the pumped storage power station, aiming at the defects in the prior art.
For this reason, the above object of the present invention is achieved by the following technical solutions:
a pumped storage power station semi-gravity drainage control method is characterized by comprising the following steps: the semi-gravity drainage control method of the pumped storage power station is based on the semi-gravity drainage system of the pumped storage power station, and comprises the following steps:
when flood occurs in the downstream river channel and the water level in the downstream river channel rises to the gate falling water level of the working gate, the working gate is closed by falling to cut off a communication channel among the gravity drainage hole, the water collecting well and the downstream river channel, and the submersible pump in the water collecting well drains water;
when the water level in the downstream river channel rises to the falling gate water level of the working gate, the accumulated water in the water collecting well continuously rises due to failure of the falling gate mechanism of the working gate or sealing failure after falling gate of the working gate, so that the falling accident gate cuts off a communication channel between the gravity drainage hole, the water collecting well and the downstream river channel and is drained by a submersible pump in the water collecting well;
and after the flood of the downstream river channel passes, opening the working gate and/or the accident gate, enabling the water in the water collecting well to automatically flow into the downstream river channel, and stopping all the submersible pumps when the water level in the water collecting well drops to the pump stopping water level.
The invention provides a semi-gravity drainage system of a pumped storage power station and a control method thereof. Therefore, the requirement of water level of the outlet riverway of the drainage hole in semi-automatic drainage can be effectively reduced, and the originally required outlet check flood level of the drainage hole is required to be lower than the lowest floor bottom elevation of the factory building, so that the normal water storage level of the outlet of the drainage hole is lower than the lowest floor bottom elevation of the factory building. The invention can greatly shorten the excavation length of the gravity drainage tunnel, and even can modify a plurality of schemes which originally only can use a water pump to pump, overhaul and leak and drain into a semi-gravity drainage scheme. The self-flowing drainage scheme is modified into a semi-self-flowing drainage scheme, so that the length of the self-flowing drainage hole is greatly shortened, and the investment of a power station can be greatly reduced; the water pump pumping and draining scheme is modified into a semi-automatic flow water draining scheme, the starting times of the submersible pump at the outlet of the water draining tunnel are greatly reduced, the overhaul, operation, maintenance and energy consumption cost of equipment such as a water pump, a motor and the like can be reduced, and the risk that the water flooding factory accident is expanded due to the fact that the water pump pumping and draining scheme cannot be effectively reduced is overcome.
Drawings
Fig. 1 is a schematic diagram of a semi-gravity drainage system of a pumped storage power station provided by the invention.
Fig. 2 is a cross-sectional view of a semi-gravity drainage system of a pumped-storage power station provided by the invention.
Detailed Description
The invention is described in further detail with reference to the figures and specific embodiments.
Referring to fig. 1-2, a leakage drainage system 1 of an underground workshop of a semi-gravity drainage system of a pumped storage power station and a unit overhaul drainage system 2 are adopted, and drainage of the overhaul and leakage drainage systems is converged to a gravity drainage hole 3 through a pipeline, a drainage ditch and the like. The bottom of the gravity drainage hole 3 is provided with a slope, and under normal conditions, the water flows through the gravity drainage hole 3 and the water collecting well 4, flows into the downstream river channel 10 and is discharged to other drainage basins through the downstream river channel 10.
When flood occurs and the water level in the downstream river channel 10 rises to the gate falling water level of the working gate 7, the second floating ball liquid level switch 9 in the river channel sends a control signal, the winch 11 is started, the working gate 7 is closed, and a channel between the self-flowing drainage hole 3, the water collecting well 4 and the downstream river channel 10 is cut off. Because of the drainage channel is cut by the working gate 7, along with the drainage of the underground powerhouse is converged into the water collecting well 4, the water level in the water collecting well 4 continuously rises, when the water level rises to the working pump starting water level, the first floating ball liquid level switch 5 sends out a working pump starting signal, 3 main submersible pumps 6 automatically start drainage, if the drainage of the underground powerhouse is large and the drainage of the 3 submersible pumps is insufficient, the water level in the water collecting well 4 continuously rises to the standby pump starting water level, the first floating ball liquid level switch 5 sends out a standby pump starting signal, the rest 2 standby submersible pumps start drainage, the water level of the water collecting well falls along with the water level, and when the water level in the water collecting well falls to the pump stopping water level, all the drainage pumps 6 stop. After the pump is stopped, when the water level in the water collecting well 4 rises to the starting water level of the working pump again, the submersible pump 6 automatically starts to drain water again. The above steps are repeated to ensure that the water level in the water collecting well 4 is maintained within a certain range, so that the water cannot flow back into the underground workshop.
As shown in fig. 2, when the water level of the downstream river 10 rises to the gate falling water level of the working gate 7, if the gate falling mechanism of the working gate 7 fails or the sealing of the working gate 7 fails after the gate falling, the downstream river 10 will leak water seriously to the side of the water collecting well, if all the submersible pumps 6 in the water collecting well 4 are started, the pumping flow rate is smaller than the flow rate of the water flowing backward in the river, the accumulated water in the water collecting well 4 will continuously rise, when the water level in the water collecting well 4 rises to the gate falling water level of the accident gate, the floating ball 12a at the tail end of the accident gate operating rod 12 rises along with the water level to drive the accident gate operating rod 12 to rotate around the rotating shaft 13, the accident gate 8 is originally hung at the bottom of the top beam of the gate chamber by the locking device at the bottom of the accident gate operating rod, when the operating rod 12 rotates for a certain angle, the lock catch 12b at the bottom of the operating rod falls off, the emergency gate 8 falls off under the action of self gravity to cut off the water flow in the gravity drainage hole 3, the water collecting well 4 and the downstream river 10. The water level of the water collecting well 4 is below the pumping drainage of the drainage pump 6, the water level descends, the first floating ball liquid level switch 5 sends a pump stopping signal after the water level descends to the pump stopping water level, all the water pumps 6 stop running, the water level in the water collecting well 4 slowly ascends after the pump is stopped, when the water level ascends to the pump starting water level again, the first floating ball liquid level switch 5 sends a pump starting signal, the submersible pump 6 starts running, and the operation is repeated so as to ensure that the water level in the water collecting well 4 fluctuates in a certain range and the water is unlikely to flow back into an underground workshop.
When the water level of the river channel is restored to the normal water storage level or below after the flood of the downstream river channel 10, a second floating ball liquid level switch 9 arranged in the river channel sends a low water level control signal, a winch 11 is started, a working gate 7 is opened, meanwhile, an accident gate 8 is lifted by an electric hoist 14 and a steel wire rope 15, and the accident gate 8 is suspended and fixed at the bottom of a beam by an operating rod 12. After the accident gate 8 and the working gate 7 are completely opened, because the water level in the downstream river channel 10 is lower than the water level of the water collecting well 4, water in the water collecting well 4 automatically flows and is discharged to the river channel, the water level in the well is reduced to be lower than the pump stop water level, the first floating ball liquid level switch 5 sends a pump stop signal, and the drainage pump 6 stops running. The drainage system returns to the gravity drainage state.
Wherein, electric block 14 inserts remote control system, and when the flood receded, not only can open accident gate 8 through electric block 14 after the door falls. And in the non-flood season, the electric block 14 is controlled to tighten the bottom steel wire rope 15, so that the accident gate 8 cannot be closed by mistake.
The above-described embodiments are intended to illustrate the present invention, but not to limit the present invention, and any modifications, equivalents, improvements, etc. made within the spirit of the present invention and the scope of the claims fall within the scope of the present invention.
Claims (8)
1. The utility model provides a semi-artesian drainage system of pumped storage power station, semi-artesian drainage system of pumped storage power station includes underground factory building seepage drainage system and unit maintenance drainage system, underground factory building seepage drainage system and unit maintenance drainage system's drainage all converges to artesian drainage hole, arranged work gate, its characterized in that between artesian drainage hole and the low reaches river course: an accident gate is arranged in a space between the working gate and the downstream river channel and is used for falling and blocking the communication between the gravity drainage hole and the downstream river channel when the working gate fails to fall or the seal fails after falling; a water collecting well is arranged in a space between the self-flowing water draining hole and the working gate, and a plurality of submersible pumps are arranged in the water collecting well.
2. The pumped-storage power station semi-gravity drainage system of claim 1, wherein: a first floating ball liquid level switch is arranged in the water collecting well and used for indicating water level height information in the water collecting well.
3. The pumped-storage power station semi-gravity drainage system of claim 1, wherein: the submersible pump comprises a working pump and a standby pump, wherein the working pump and the standby pump are multiple.
4. The pumped-storage power station semi-gravity drainage system of claim 1, wherein: the emergency gate is characterized in that a frame-shaped operating rod is arranged above the emergency gate, a floating ball is arranged at one end of the frame-shaped operating rod and arranged in the water collecting well, a lock catch is arranged at the other end of the frame-shaped operating rod and used for hanging the emergency gate in a non-working state, a rotating shaft is arranged in the middle of the frame-shaped operating rod, and the rotating shaft is fixed to the top of a gate chamber of the emergency gate.
5. The pumped-storage power plant semi-gravity drainage system of claim 1 or 4, wherein: the semi-gravity drainage system of the pumped storage power station is also provided with an electric hoist, the electric hoist is fixed to the top of a gate chamber of the accident gate, and the lower end of the electric hoist is fixed to the top of the accident gate through a steel wire.
6. The pumped-storage power station semi-gravity drainage system of claim 1, wherein: the working gate is lowered or lifted by a winch.
7. The pumped-storage power station semi-gravity drainage system of claim 1, wherein: and a second floating ball liquid level switch is further arranged in the downstream riverway and is used for indicating the height information of the water level in the downstream riverway.
8. A pumped storage power station semi-gravity drainage control method is characterized by comprising the following steps: the pumped storage power station semi-gravity drainage control method is based on the pumped storage power station semi-gravity drainage system of claim 1, and includes:
when flood occurs in the downstream river channel and the water level in the downstream river channel rises to the gate falling water level of the working gate, the working gate is closed by falling to cut off a communication channel among the gravity drainage hole, the water collecting well and the downstream river channel, and the submersible pump in the water collecting well drains water;
when the water level in the downstream river channel rises to the falling gate water level of the working gate, the accumulated water in the water collecting well continuously rises due to failure of the falling gate mechanism of the working gate or sealing failure after falling gate of the working gate, so that the falling accident gate cuts off a communication channel between the gravity drainage hole, the water collecting well and the downstream river channel and is drained by a submersible pump in the water collecting well;
and after the flood of the downstream river channel passes, opening the working gate and/or the accident gate, enabling the water in the water collecting well to automatically flow into the downstream river channel, and stopping all the submersible pumps when the water level in the water collecting well drops to the pump stopping water level.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110465343.5A CN113216105A (en) | 2021-04-28 | 2021-04-28 | Semi-gravity drainage system of pumped storage power station and control method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110465343.5A CN113216105A (en) | 2021-04-28 | 2021-04-28 | Semi-gravity drainage system of pumped storage power station and control method |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN204212124U (en) * | 2014-11-12 | 2015-03-18 | 中国电建集团成都勘测设计研究院有限公司 | The anti-flood system of impact type unit |
| CN105369779A (en) * | 2015-11-12 | 2016-03-02 | 李春劲 | Flood gate and drainage pump station integrated structure |
| CN205780984U (en) * | 2016-06-01 | 2016-12-07 | 河海大学 | A kind of Auto-drainage valve for controlling paddy field water level |
-
2021
- 2021-04-28 CN CN202110465343.5A patent/CN113216105A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN204212124U (en) * | 2014-11-12 | 2015-03-18 | 中国电建集团成都勘测设计研究院有限公司 | The anti-flood system of impact type unit |
| CN105369779A (en) * | 2015-11-12 | 2016-03-02 | 李春劲 | Flood gate and drainage pump station integrated structure |
| CN205780984U (en) * | 2016-06-01 | 2016-12-07 | 河海大学 | A kind of Auto-drainage valve for controlling paddy field water level |
Non-Patent Citations (1)
| Title |
|---|
| 汪德楼等: "抽水蓄能电站地下厂房排水系统设计方案选择及研究", 《抽水蓄能电站工程建设文集2020》 * |
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Application publication date: 20210806 |