CN114960568A - Emergency accident drainage system for leakage water collecting well of large hydropower station - Google Patents
Emergency accident drainage system for leakage water collecting well of large hydropower station Download PDFInfo
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- CN114960568A CN114960568A CN202210432347.8A CN202210432347A CN114960568A CN 114960568 A CN114960568 A CN 114960568A CN 202210432347 A CN202210432347 A CN 202210432347A CN 114960568 A CN114960568 A CN 114960568A
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 202
- 238000012423 maintenance Methods 0.000 claims abstract description 32
- 235000020681 well water Nutrition 0.000 claims abstract description 7
- 239000002349 well water Substances 0.000 claims abstract description 7
- 238000005192 partition Methods 0.000 claims abstract description 5
- 239000007788 liquid Substances 0.000 claims description 11
- 229910000831 Steel Inorganic materials 0.000 claims description 7
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- 238000004891 communication Methods 0.000 description 6
- 230000002159 abnormal effect Effects 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 239000011435 rock Substances 0.000 description 2
- 241000124879 Grus leucogeranus Species 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
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- 238000009826 distribution 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
- E03—WATER SUPPLY; SEWERAGE
- E03F—SEWERS; CESSPOOLS
- E03F5/00—Sewerage structures
- E03F5/02—Manhole shafts or other inspection chambers; Snow-filling openings; accessories
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- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03F—SEWERS; CESSPOOLS
- E03F5/00—Sewerage structures
- E03F5/04—Gullies inlets, road sinks, floor drains with or without odour seals or sediment traps
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- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03F—SEWERS; CESSPOOLS
- E03F5/00—Sewerage structures
- E03F5/22—Adaptations of pumping plants for lifting sewage
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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
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
The invention provides an emergency accident drainage system for a leakage water collecting well of a large hydropower station, which comprises the leakage water collecting well, an overhaul water collecting well and a drainage pump room, wherein a partition wall is arranged between the leakage water collecting well and the overhaul water collecting well and is independent of the leakage water collecting well and the overhaul water collecting well; a leakage drainage valve chamber is arranged above the leakage water collecting well in the main power house of the hydropower station, a whole plant leakage drainage main pipe is arranged in the leakage drainage valve chamber, and the whole plant leakage drainage main pipe is communicated with the leakage water collecting well emergency accident drainage pipe; a normally closed pneumatic ball valve and a first check valve are arranged on a factory-wide leakage drainage main pipe in the leakage drainage valve chamber, and a leakage water collecting well water inlet pipe is arranged in front of the normally closed pneumatic ball valve on the factory-wide leakage drainage main pipe in the leakage drainage valve chamber; the normally closed pneumatic ball valve is controlled to be opened or closed by a pneumatic shifting fork actuator. The invention has simple and reliable structure and convenient installation and maintenance, is suitable for leakage water collecting wells of large hydropower stations and other occasions with indirect drainage modes of the leakage water collecting wells.
Description
Technical Field
The invention belongs to the technical field of hydraulic and hydroelectric engineering, and particularly relates to an emergency accident drainage system for a seepage water collecting well of a large hydropower station.
Background
With the rapid improvement of the construction level of hydropower engineering in China, especially in recent years, the construction scale of underground plant cavern groups and the single-machine scale of hydroelectric generating sets are getting larger and larger as the hydropower stations of large underground plants such as Xiluodi, Udongde, white Crane beach and the like are put into production and generate power in succession. In order to collect and remove leakage water at hydraulic buildings, drainage galleries and the like in a factory building and leakage water at the positions of a unit main shaft seal, an elastic cushion layer, a large-shaft center hole air supply and drainage pipe and the like in time, the conventional large hydropower station is provided with a leakage water collecting well and a leakage drainage system, namely the leakage water firstly flows into the leakage water collecting well through the leakage drainage gallery, a leakage drainage main pipe of a whole factory and the like, and then the leakage water in the well is automatically and safely drained out of the factory by using a leakage drainage pump arranged in the leakage water collecting well according to the rising condition of the water level in the well. However, the effective volume of the leakage collecting well and the drainage capacity of the leakage drainage system are designed according to the amount of leakage water generated during normal operation of the power station, and if abnormal water inrush occurs at the surrounding rock of an underground factory building, a machine pit of a water turbine, a pressure steel pipe in front of a water inlet valve of the water turbine, or a drainage pump fails, the leakage collecting well and the leakage drainage system cannot meet the drainage requirement, so that the leakage collecting well, the drainage pump and a power distribution system thereof are submerged and cannot work, and finally the safe and stable operation of the power station is seriously affected.
In order to solve the problem, chinese utility model patent CN205314233U discloses a multi-functional sump pit structure of power station, it is provided with the seepage sump pit at seepage sump pit top to overhauing the one-way UNICOM pipeline of sump pit, long handle valve and check valve, when seepage sump pit water level surpassed too high warning water level, the long handle valve on the above-mentioned UNICOM pipeline is opened to the manual work immediately, the above-mentioned UNICOM pipeline of seepage accessible was discharged into the maintenance sump pit in the seepage sump pit this moment, through utilizing idle maintenance sump pit and maintenance drainage system, in time get rid of the factory building with the infiltration in the sump pit, and then avoid seepage sump pit water level further to rise. However, the technical solution provided by the above patent is only suitable for small hydropower stations and not for large ones, mainly for the following reasons:
(1) the aperture of the one-way communication pipeline of the seepage and overhaul water collection well adopted by the patent is small (only DN 300-DN 500) and the position is high, the buffering volume of the seepage water collection well above the central elevation of the one-way communication pipeline is small, and when the drainage capacity of the one-way communication pipe is smaller than the seepage water inflow amount of the seepage water collection well, the water level of the seepage water collection well quickly rises to a pump room so as to cause a water flooding factory accident;
(2) the leakage and overhaul water collecting well one-way communication pipeline, the long-handle valve, the check valve and the like are fixed on the structure body in a hanging mode through the hanging bracket, the total weight of the DN 300-DN 500 one-way communication pipeline, the valve and other equipment is nearly more than 2.5 tons, so that the stability of a pipeline system is poor, and when the valve fails and needs to be overhauled and replaced, operation and maintenance personnel need to temporarily set up a ladder stand at the bottom of the leakage water collecting well, so that later overhaul and maintenance are very troublesome, and personal safety risks exist;
(3) the operating valve that seepage, the one-way UNICOM pipeline of maintenance sump pit of above-mentioned patent adopted is long handle valve (DN 300~ DN 500), and it opens, closes and all needs manual operation handle, wastes time and energy and compare in valves commonly used such as ball valve, eccentric hemisphere valve, and the reliability of long handle valve is relatively poor.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: aiming at the defects in the prior art, the leakage water collecting well emergency accident drainage system which is safe, reliable, convenient to operate and maintain and suitable for large hydropower stations is provided.
Therefore, the above purpose of the invention is realized by the following technical scheme:
an emergency accident drainage system for a leakage water collecting well of a large hydropower station comprises the leakage water collecting well, an overhaul water collecting well and a drainage pump room, wherein the leakage water collecting well and the overhaul water collecting well are arranged in a main power house of the hydropower station, and partition walls are arranged between the leakage water collecting well and the overhaul water collecting well and are independent of each other; the method is characterized in that:
a leakage drainage valve chamber is arranged above a leakage water collecting well in the hydropower station main plant, a factory wide leakage drainage main pipe penetrating through the whole leakage drainage valve chamber is arranged in the leakage drainage valve chamber, one end of the factory wide leakage drainage main pipe is led out of the hydropower station main plant, the other end of the factory wide leakage drainage main pipe is communicated with an emergency accident drainage pipe of the leakage water collecting well, and the other end of the emergency accident drainage pipe of the leakage water collecting well is communicated with a maintenance water collecting well;
a normally closed pneumatic ball valve and a first check valve are arranged on a factory-wide leakage drainage main pipe in the leakage drainage valve chamber, a leakage water collecting well water inlet pipe is arranged in front of the normally closed pneumatic ball valve on the factory-wide leakage drainage main pipe in the leakage drainage valve chamber, and the other end of the leakage water collecting well water inlet pipe is communicated to a leakage water collecting well;
the normally closed pneumatic ball valve is controlled to be opened or closed by a pneumatic shifting fork actuator;
the pneumatic shifting fork actuator control box is arranged in the drainage pump room and is used for pneumatically controlling the pneumatic shifting fork actuator.
While adopting the technical scheme, the invention can also adopt or combine the following technical scheme:
as a preferred technical scheme of the invention: and the seepage water collecting well and the overhaul water collecting well are internally provided with fixed drainage systems so as to automatically and safely drain seepage water in the seepage water collecting well and the overhaul water collecting well out of a factory according to the rising conditions of the water level in the seepage water collecting well and the overhaul water collecting well.
As a preferred technical scheme of the invention: a manual hydraulic pump, a two-position four-way manual reversing valve, a normally open high-pressure ball valve, a second check valve and a three-position four-way manual reversing valve are respectively arranged on a platform of the pneumatic shifting fork actuator control box; an oil tank is arranged in the control box of the pneumatic shifting fork actuator, and the oil tank is provided with an oil tank oil discharge pipe and an oil tank oil return pipe;
the two-position four-way manual reversing valve is connected into an oil tank oil discharge pipe, an oil tank oil return pipe, an oil inlet pipe of a pneumatic shifting fork actuator and an oil discharge pipe of the pneumatic shifting fork actuator;
the three-position four-way manual reversing valve is connected into a drain pump room maintenance air manifold, an air inlet pipe of a pneumatic shifting fork actuator and an air outlet pipe of the pneumatic shifting fork actuator;
a bypass pipe is arranged between an oil inlet pipe of the pneumatic shifting fork actuator and an oil outlet pipe of the pneumatic shifting fork actuator, and a normally open high-pressure ball valve is arranged on the bypass pipe to realize the switching of the pneumatic shifting fork actuator between an automatic mode and a manual mode.
As a preferred technical scheme of the invention: the control box of the pneumatic shifting fork actuator is made of channel steel and steel plates.
As a preferred technical scheme of the invention: and a second normally-open ball valve and a pressure gauge are sequentially arranged on the gas main pipe for overhauling the drainage pump room behind the three-position four-way manual reversing valve.
As a preferred technical scheme of the invention: and the top of the seepage drainage valve chamber is provided with a hanging hole.
As a preferred technical scheme of the invention: and the top of the leakage drainage valve chamber is provided with a manhole and a corresponding ladder stand.
As a preferred technical scheme of the invention: a floating ball type liquid level switch and a piezoresistive water level meter are arranged in the seepage water collecting well; the floating ball type liquid level switch and the junction box of the piezoresistive water level meter are arranged at proper positions in the leakage drain valve chamber.
As a preferred technical scheme of the invention: the elevation of the bottom plate of the seepage drainage valve chamber is higher than the height of the alarm water level in the seepage catchment well by more than 2 m.
As a preferred technical scheme of the invention: the air supply pressure of the air main pipe for overhauling the drainage pump room is about 0.8 MPa.
As a preferred technical scheme of the invention: and the air inlet and the air outlet ports of the pneumatic shifting fork actuator are provided with quick exhaust valves, and the quick exhaust valves are connected with the air inlet and the air outlet pipes of the pneumatic shifting fork actuator.
As a preferred technical scheme of the invention: the oil inlet pipe and the oil outlet pipe of the pneumatic shifting fork actuator adopt high-pressure rubber pipes;
as a preferred technical scheme of the invention: the pipe diameters of the emergency drainage pipe of the seepage water collecting well, the leakage drainage main pipe of the whole factory and the water inlet pipe of the seepage water collecting well are all more than DN 600.
The invention provides an emergency accident drainage system for a leakage water collecting well of a large hydropower station, which can manually arrange a three-position four-way manual reversing valve on a control box of a pneumatic shifting fork actuator at an opening gear when the water level in the leakage water collecting well exceeds an alarm water level, directly drain accumulated water in the leakage water collecting well to an overhaul water collecting well through an emergency accident drainage pipe of the leakage water collecting well, and avoid the further rise of the water level of the leakage water collecting well by utilizing the redundant volume of the overhaul water collecting well and the drainage capacity of the overhaul drainage system, thereby avoiding the occurrence of flooding factory accidents and greatly ensuring the safe and stable operation of the hydropower station.
Compared with the prior art, the invention has the following beneficial effects:
1) the leakage water collecting well emergency accident drainage system in the invention communicates the whole plant leakage drainage main pipe with the water collecting well emergency accident drainage pipe, when abnormal water gushing occurs at the positions of a water turbine machine pit and the like and the leakage water amount in the whole plant leakage drainage main pipe is far higher than the designed water amount or the water level in the leakage water collecting well is higher than the alarm water level, the three-position four-way manual reversing valve on the pneumatic shifting fork actuator control box can be manually arranged at an opening gear, the normally closed pneumatic ball valve is rapidly and automatically opened under the action of air pressure, and at the moment, the leakage water in the whole plant leakage drainage main pipe is partially shunted to the maintenance water collecting well and is drained out of a plant through the maintenance drainage system, so that the accident can be prevented from further expanding.
2) If abnormal water gushing occurs at places such as surrounding rocks of an underground powerhouse and the water level in the seepage water collecting well exceeds the high alarm water level or the water level in the seepage water collecting well directly submerges a seepage water drainage valve chamber, the seepage water collecting well and the maintenance water collecting well are communicated in a one-way mode by the seepage water collecting well emergency drainage pipe with a large diameter and a low installation position, the normally closed pneumatic ball valve and the check valve (more than DN 600), and at the moment, redundant accumulated water in the seepage water collecting well or the seepage water drainage valve chamber can be directly drained to the maintenance water collecting well through the seepage water collecting well emergency drainage pipe, and the redundant maintenance water collecting well volume and the maintenance drainage system drainage capacity are utilized, so that the water level of the seepage water collecting well is prevented from further rising, the occurrence of water logging powerhouse accidents is avoided, and the safe and stable operation of the hydropower station is greatly guaranteed.
3) Because the seepage water collecting well emergency accident drainage system is provided with the seepage drainage valve chamber, the valve chamber is internally provided with the related measures such as a hanging hole, an inlet, a ladder and the like, equipment such as a large-diameter seepage water collecting well emergency accident drainage pipe, a whole-plant seepage drainage header pipe, a normally closed pneumatic ball valve, a check valve (more than DN 600) and the like can be directly fixed on the bottom plate of the seepage drainage valve chamber through the sitting support, the stability of a pipeline system of the drainage system is obviously enhanced, and meanwhile, operation and maintenance personnel can directly operate the related equipment on the ground of the valve chamber, so that the overhaul and maintenance convenience is greatly improved, and the personal safety risk is reduced.
4) The leakage water collecting well emergency accident drain pipe is isolated by the normally closed pneumatic ball valve with the pneumatic shifting fork actuator, the mounting position of the control box of the pneumatic shifting fork actuator is high, and operation and maintenance personnel can realize automatic opening and closing of the valve only through simple operation, so that time and labor are saved. In addition, the pneumatic ball valve has no relevant electrical components, so that the pneumatic ball valve can be opened and closed normally even if the pneumatic ball valve is submerged by water. When the air supply source of the pneumatic shifting fork actuator fails and cannot be used, the operation and maintenance personnel can press the pressure rod of the manual hydraulic pump to manually open and close the valve.
5) The invention has simple and reliable structure and convenient installation and maintenance, is suitable for other occasions with indirect drainage modes of the seepage water collecting well besides the seepage water collecting well of the large hydropower station, and has good application scenes.
Drawings
Fig. 1 is a schematic structural diagram of an emergency drainage system for a seepage sump of a large hydropower station provided by the invention;
FIG. 2 is a schematic axial view of a control box of a pneumatic fork actuator;
FIG. 3 is a three-dimensional isometric view of a pneumatic fork actuator and piping;
in the figure: 1-a first normally open ball valve; 2-normally closed pneumatic ball valve; 3-a pneumatic shifting fork actuator; 4-a first check valve; 5-a quick-discharge valve; 6-an oil tank; 7-a manual hydraulic pump; 8-two-position four-way manual reversing valve; 9-normally open high pressure ball valve; 10-three-position four-way manual reversing valve; 11-pressure gauge; 12-a piezoresistive water level gauge; 13-a float ball type liquid level switch; 14-a second check valve; 15-a control box of a pneumatic shifting fork actuator; 16-a second normally open ball valve; 101-leakage drainage main pipe of the whole plant; 102-a seepage sump inlet pipe; 103-leakage water collecting well emergency accident drain pipe; 104-air inlet pipe of pneumatic shifting fork actuator; 105-pneumatic fork actuator exhaust; 106-oil inlet pipe of pneumatic shifting fork actuator; 107-oil drain pipe of pneumatic shifting fork actuator; 108-a drain pump house maintenance air manifold; 109-oil tank return pipe; 110-tank drain pipe; 111-a bypass pipe; 201-a seepage collecting well; 202-overhauling a water collecting well; 203-a leaky drain valve chamber; 204-a drainage pump room; 205-concrete partition walls; 206-manhole; 207-fixed ladder stand; 208-hanging the object hole.
Detailed Description
The invention is described in further detail with reference to the figures and specific embodiments.
As shown in fig. 1 to 3, in an emergency drainage system for a leakage water collecting well of a large hydropower station, a leakage water collecting well 201 and an overhaul water collecting well 202 are respectively arranged at appropriate positions of a main building of the hydropower station. The seepage sump 201 is separated from the service sump 202 by a concrete partition 205 and is in communication with the seepage sump emergency drain 103. A drainage pump room 204 is arranged above the leakage water collecting well 201 and the maintenance water collecting well 202, and a pneumatic shifting fork actuator control box 15 and a drainage pump room maintenance air manifold 108 are arranged in the pump room.
A leakage drainage valve chamber 203 is arranged at a proper position at the upper part of the leakage water collecting well 201; a leakage drainage main pipe 101 led from the whole factory of the main factory building is arranged in the leakage drainage valve chamber 203 and is connected with the leakage water collecting well emergency drainage pipe 103. A leakage water collecting well water inlet pipe 102 is led out from a leakage water collecting main pipe 101 of the whole factory and is arranged to a leakage water collecting well 201 side by side, and a first normally-open ball valve 1 is arranged in front of a branch of the leakage water collecting well water inlet pipe 102 of the leakage water collecting main pipe 101 of the whole factory.
Fixed drainage systems are arranged in the leakage water collecting well 201 and the overhaul water collecting well 202, and the drainage systems can automatically and safely drain water seeping in the water collecting well out of a factory according to the rising condition of the water level in the water collecting well.
The pneumatic shifting fork actuator control box 15 is made of channel steel and steel plates, and a manual hydraulic pump 7, a two-position four-way manual reversing valve 8, a normally-open high-pressure ball valve 9, a second check valve 14 and a three-position four-way manual reversing valve 10 are respectively arranged on a platform of the pneumatic shifting fork actuator control box; an oil tank 6 is arranged in the control box 15 of the pneumatic shifting fork actuator.
A hanging hole 208, a manhole 206 and a fixed ladder 207 are arranged in the seepage drainage valve chamber 203, and a piezoresistive water level gauge 12 and a floating ball type liquid level switch 13 are arranged in the water collecting well; the floating ball type liquid level switch 12 and the junction box of the piezoresistive water level meter 13 are arranged at proper positions in the leakage drainage valve chamber 203; the elevation of the bottom plate of the leakage drainage valve chamber 203 is more than 3m higher than the alarm water level of the leakage water collecting well 201;
a factory leakage drainage main pipe 101 communicated with a leakage water collecting well emergency accident drainage pipe 103 is provided with a normally closed pneumatic ball valve 2, a pneumatic shifting fork actuator 15 and a first check valve 4; the normally closed pneumatic ball valve 2 is connected with the pneumatic shifting fork actuator 15 through a valve shaft; the pneumatic shifting fork actuator 15 is provided with related interfaces and is respectively connected with an air inlet pipe 104, an exhaust pipe 105, an oil inlet pipe 106 and an oil outlet pipe 107 of the pneumatic shifting fork actuator;
the air inlet pipe 104 of the pneumatic shifting fork actuator, the air outlet pipe 105 and the air main pipe 108 for draining the pump room to be overhauled are connected to the three-position four-way manual reversing valve 10 together; the air supply pressure of the air main pipe 108 for overhauling the drainage pump room is about 0.8 MPa;
an oil inlet pipe 106 and an oil outlet pipe 107 of the pneumatic shifting fork actuator, an oil return pipe 109 of an oil tank and an oil outlet pipe 110 are connected to the two-position four-way manual reversing valve 8 together; a bypass pipe 111 and a normally open high pressure ball valve 9 are arranged between the oil inlet pipe 106 and the oil outlet pipe 107 of the pneumatic shifting fork actuator;
a pressure gauge 11 and a second normally open ball valve 16 are arranged on the air main pipe 108 for overhauling the drainage pump room;
the oil tank 6, the manual hydraulic pump 7 and the check valve 14 are connected in series by the oil tank discharge pipe 110 and are connected into the two-position four-way manual reversing valve 8;
the air inlet and outlet interfaces of the pneumatic shifting fork actuator 3 are provided with a quick exhaust valve 5 and are connected with an air inlet pipe 104 and an exhaust pipe 105 of the pneumatic shifting fork actuator;
the oil inlet pipe 106 and the oil outlet pipe 107 of the pneumatic shifting fork actuator are both high-pressure rubber pipes.
The pipe diameters of the emergency drainage pipe 103 of the seepage water collecting well, the seepage drainage main pipe 101 of the whole factory and the water inlet pipe 102 of the seepage water collecting well are more than DN600
The operation process of the emergency accident drainage system of the leakage water collecting well of the large hydropower station provided by the invention is as follows:
(1) automatic mode
S101, after the equipment of the emergency accident drainage system of the leakage water collecting well of the large hydropower station is installed, debugged and checked and has commissioning conditions, enabling a normally-open high-pressure ball valve 9 on a control box 15 of a pneumatic shifting fork actuator to be in an open state;
s102, when the floating ball type liquid level switch 13 or the piezoresistive water level meter 12 in the seepage water collecting well 201 sends out a high water level alarm signal, the operation and maintenance personnel should manually place the three-position four-way manual reversing valve 10 on the pneumatic shifting fork actuator control box 15 in an opening gear in time, and the pneumatic shifting fork actuator rapidly acts under the action of air pressure and automatically opens the normally closed pneumatic ball valve 2. At this time, the leakage water in the leakage drainage main pipe 101 or the leakage water collecting well 201 of the whole plant is drained to the maintenance water collecting well 202 through the leakage water collecting well emergency drainage pipe 103. Finally, a fixed drainage system arranged in the overhaul water collection well 202 automatically drains the leakage water of the overhaul water collection well 202 out of a factory in time according to the rising condition of the water level in the water collection well, so that the problem that the water level of the leakage water collection well is further raised is effectively solved, and the occurrence of flooding factory accidents is avoided;
s103, when the floating ball type liquid level switch 13 or the piezoresistive water level meter 12 in the seepage water collecting well 201 sends a pump stopping water level signal, the operation and maintenance personnel select to manually place the three-position four-way manual reversing valve 10 on the pneumatic shifting fork actuator control box 15 in a closing gear, and the pneumatic shifting fork actuator rapidly acts under the action of air pressure and automatically closes the normally closed pneumatic ball valve 2.
(2) Manual mode
S201, when a floating ball type liquid level switch 13 or a piezoresistive water level meter 12 in the seepage water collecting well 201 sends a high water level alarm signal and data of a pressure gauge 11 on a drainage pump house maintenance air main pipe 108 is obviously lower than the design pressure of 0.8 MPa, an operation and maintenance worker should timely enable a normally open high-pressure ball valve 9 on a pneumatic shifting fork actuator control box 15 to be in a closed state, meanwhile, a two-position four-way manual reversing valve 8 is manually arranged at an opening gear, and the pneumatic shifting fork actuator 3 rapidly acts under the action of oil pressure and completely opens a normally closed pneumatic ball valve 2 in a short time by manually pressing a pressure rod of a manual hydraulic pump 7. At this time, the leakage water in the leakage drainage main pipe 101 or the leakage water collecting well 201 of the whole plant is drained to the maintenance water collecting well 202 through the leakage water collecting well emergency drainage pipe 103.
S202, when a floating ball type liquid level switch 13 or a piezoresistive water level meter 12 in the seepage water collecting well 201 sends a pump stopping water level signal, operation and maintenance personnel select to manually place the two-position four-way manual reversing valve 8 on the pneumatic shifting fork actuator control box 15 in a closing gear. By manually pressing the pressure lever of the manual hydraulic pump 7, the pneumatic shifting fork actuator 3 rapidly acts under the action of oil pressure and completely closes the normally closed pneumatic ball valve 2 in a short time.
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 (10)
1. An emergency accident drainage system for a leakage water collecting well of a large hydropower station comprises the leakage water collecting well, an overhaul water collecting well and a drainage pump room, wherein the leakage water collecting well and the overhaul water collecting well are arranged in a main power house of the hydropower station, and partition walls are arranged between the leakage water collecting well and the overhaul water collecting well and are independent of each other; the method is characterized in that:
a leakage drainage valve chamber is arranged above a leakage water collecting well in the hydropower station main plant, a factory wide leakage drainage main pipe penetrating through the whole leakage drainage valve chamber is arranged in the leakage drainage valve chamber, one end of the factory wide leakage drainage main pipe is led out of the hydropower station main plant, the other end of the factory wide leakage drainage main pipe is communicated with an emergency accident drainage pipe of the leakage water collecting well, and the other end of the emergency accident drainage pipe of the leakage water collecting well is communicated with a maintenance water collecting well;
a normally closed pneumatic ball valve and a first check valve are arranged on a factory-wide leakage drainage main pipe in the leakage drainage valve chamber, a leakage water collecting well water inlet pipe is arranged in front of the normally closed pneumatic ball valve on the factory-wide leakage drainage main pipe in the leakage drainage valve chamber, and the other end of the leakage water collecting well water inlet pipe is communicated to a leakage water collecting well;
the normally closed pneumatic ball valve is controlled to be opened or closed by a pneumatic shifting fork actuator;
the pneumatic shifting fork actuator control box is arranged in the drainage pump room and is used for pneumatically controlling the pneumatic shifting fork actuator.
2. The emergency drainage system of a leaky collector well of a large hydropower station according to claim 1, wherein: and the seepage water collecting well and the overhaul water collecting well are internally provided with fixed drainage systems so as to automatically and safely drain seepage water in the seepage water collecting well and the overhaul water collecting well out of a factory according to the rising conditions of the water level in the seepage water collecting well and the overhaul water collecting well.
3. The emergency drainage system of a leaky collector well of a large hydropower station according to claim 1, wherein: a manual hydraulic pump, a two-position four-way manual reversing valve, a normally-open high-pressure ball valve, a second check valve and a three-position four-way manual reversing valve are respectively arranged on a platform of the pneumatic shifting fork actuator control box; an oil tank is arranged in the control box of the pneumatic shifting fork actuator, and the oil tank is provided with an oil tank oil discharge pipe and an oil tank oil return pipe;
the two-position four-way manual reversing valve is connected into an oil tank oil discharge pipe, an oil tank oil return pipe, an oil inlet pipe of a pneumatic shifting fork actuator and an oil discharge pipe of the pneumatic shifting fork actuator;
the three-position four-way manual reversing valve is connected into a drain pump room maintenance air manifold, an air inlet pipe of a pneumatic shifting fork actuator and an air outlet pipe of the pneumatic shifting fork actuator;
a bypass pipe is arranged between an oil inlet pipe of the pneumatic shifting fork actuator and an oil outlet pipe of the pneumatic shifting fork actuator, and a normally open high-pressure ball valve is arranged on the bypass pipe to realize the switching of the pneumatic shifting fork actuator between an automatic mode and a manual mode.
4. The emergency drainage system of a leaky collector well of a large hydropower station according to claim 3, wherein: the control box of the pneumatic shifting fork actuator is made of channel steel and steel plates.
5. The emergency drainage system of a large hydropower station seepage sump well according to claim 1 or 3, wherein: and a second normally-open ball valve and a pressure gauge are sequentially arranged on the gas main pipe for overhauling the drainage pump room behind the three-position four-way manual reversing valve.
6. The emergency drainage system of a leaky collector well of a large hydropower station according to claim 1, wherein: and the top of the leakage drainage valve chamber is provided with a hanging hole.
7. The emergency drainage system of a leaky collector well of a large hydropower station according to claim 1, wherein: and the top of the leakage drainage valve chamber is provided with a manhole and a corresponding ladder stand.
8. The emergency drainage system of a leaky collector well of a large hydropower station according to claim 1, wherein: a floating ball type liquid level switch and a piezoresistive water level meter are arranged in the seepage water collecting well; the floating ball type liquid level switch and the junction box of the piezoresistive water level meter are arranged at proper positions in the leakage drain valve chamber.
9. The emergency drainage system of a leaky collector well of a large hydropower station according to claim 1, wherein: the elevation of the bottom plate of the seepage drainage valve chamber is higher than the height of the alarm water level in the seepage catchment well by more than 2 m.
10. The emergency drainage system of a leaky collector well of a large hydropower station according to claim 1, wherein: the air supply pressure of the air main pipe for overhauling the drainage pump room is about 0.8 MPa.
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