CN117272455A - Tail water arrangement method for pumped storage power station penetrating through large-scale movable fracture - Google Patents
Tail water arrangement method for pumped storage power station penetrating through large-scale movable fracture Download PDFInfo
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Abstract
The invention discloses a method for arranging tail water of a pumped storage power station for traversing large-scale active fracture, which comprises the following steps: determining the position of the lower reservoir according to the position of the movable fracture and related data, and determining the position of the upper reservoir by combining the distance-to-height ratio and the related data; the position of a main factory building is planned according to the distance between the upper reservoir and the lower reservoir and related data; drawing up a tail water line; the tail water line comprises a tail water tunnel, a tail water forehearth and a tail water open channel which are sequentially communicated, and the tail water open channel penetrates through the movable fracture; and the rechecking water delivery system is regulated and ensured, so that the water pump turbine operates in a region with better speed regulation performance. According to the tail water arrangement method of the pumped storage power station, the tail water tunnel is connected with the lower reservoir through the tail water open channel, the open channel passes through the fracture at a large angle, the influence of movable fracture is reduced, and the anti-seismic safety is improved; the method is suitable for the topography of northwest areas, shortens the length of a tail water line, reduces engineering investment, ensures engineering safety, has simple arrangement mode, is safe and reliable, and is convenient to overhaul.
Description
Technical Field
The invention belongs to the technical field of pumped storage power stations, and relates to a method for arranging tail water of a pumped storage power station for traversing large-scale active fractures.
Background
The construction of the pumped storage power station in the northwest area rapidly develops, but the new generation is due to the movement of the plates of the crust, so that the construction of the pumped storage power station in the northwest area mostly encounters the movable fracture, and the activity fracture is high in the northwest area. According to the related requirements that water retaining buildings such as a dam and the like should not be built on a known movable fault, the treatment principle aiming at the movable fracture is generally based on avoidance, and certain avoidance distance should be met; when the line cannot avoid passing through, proper crossing measures are needed, and the investment influence of the hub arrangement scheme of the pumped storage power station on the whole project is greatly influenced, generally, the scheme of crossing the movable fault has better economical efficiency, but the technical risk is increased.
At present, the way of the pumped storage power station to pass through the living fracture mostly selects tunnel or tunnel internal exposed steel pipe schemes. However, the above-mentioned scheme of traversing still has certain drawbacks, for example, the current tunnel lining structure mostly resists the adverse effect of the active fault through the form of increasing rigidity such as grouting, reserve the clearance deformation layer between excavation face and tunnel upper portion, set up the energy dissipation buffer layer in the bottom, or install the bright steel pipe in the hole and set up the telescopic joint, the big deformation condition when the activity fracture causes the maintenance difficulty with difficulty to the measure above.
Disclosure of Invention
The invention aims to provide a method for arranging tail water of a pumped storage power station for crossing large-scale active fracture, which solves the problem that the crossing scheme in the prior art is difficult to adapt to the large deformation condition of the active fracture in the earthquake, so that the overhaul is difficult.
The technical scheme adopted by the invention is that the tail water arrangement method of the pumped storage power station for traversing large-scale active fracture is implemented according to the following steps:
step 1, determining the position of a lower reservoir according to the position of the movable fracture and related data, and determining the position of an upper reservoir by combining the distance-to-height ratio and the related data;
step 2, the position of the main factory building is planned according to the distance between the upper reservoir and the lower reservoir and related data;
step 3, drawing up tail water lines according to the positions of the main plant and the lower reservoir and related data; the tail water line comprises a tail water tunnel, a tail water forehearth and a tail water open channel which are sequentially arranged between the main factory building and the lower reservoir and are communicated with each other, and the tail water open channel penetrates through the movable fracture;
and step 4, checking the regulation guarantee of the water delivery system, so that the water pump turbine operates in a region with better speed regulation performance.
The invention is also characterized in that:
in step 1, the related data includes: topography geological conditions, environment-friendly water conservation sensitive factors, land and civil migration, construction conditions and earth and stone balance conditions;
the lower reservoir is located the cracked upper disc of activity, and the manger plate dam of lower reservoir satisfies with the cracked distance of activity: if the water retaining dam of the lower reservoir is positioned on the upper plate of the movable fracture, the distance between the water retaining dam and the movable fracture is not less than 400m; if the water retaining dam of the lower reservoir is positioned on the lower disc of the movable fracture, the distance between the water retaining dam and the movable fracture is not less than 600m.
In step 2, the main building is arranged in the depth of the mountain, is far away from the movable fracture, and simultaneously meets the regulation and guarantee requirements and shortens the length of the auxiliary cavern.
The elevation of the tail water open channel bottom plate is the same as that of the reservoir bottom of the lower reservoir, the included angle between the axis of the tail water open channel and the movable fracture trend is not smaller than 60 degrees, and the excavation slope ratio of the tail water open channel is 1:1.4-1.7.
In the step 3, calculating the height difference between the elevation of the bottom plate of the front pool of the tail water and the elevation of the bottom plate of the open channel of the tail water according to a water inlet submerged depth calculation formula, wherein the front pool of the tail water and the open channel of the tail water adopt slope transition;
the downstream water inlet/outlet is arranged in the tailwater forehearth, the distance between the downstream water inlet/outlet and the movable fracture is larger than 50m, the downstream water inlet/outlet is communicated with the main factory building through the tailwater tunnel, and the downstream water inlet/outlet is communicated with the tailwater tunnel and the tailwater open channel.
The tail water tunnel comprises an upper flat section and a lower flat section, the upper flat section and the lower flat section are connected by adopting a slope, an inclined shaft or a vertical shaft, the axis of the upper flat section, the axis of the tail water forebay and the axis of the tail water open channel of the tail water tunnel are kept consistent, and the upper flat section is communicated with the downstream water inlet/outlet.
A tail water tunnel overhaul gate chamber is arranged at a position, close to the downstream water inlet/outlet, of the tail water tunnel.
A water retaining gate is arranged at the junction of the tailwater open channel and the lower reservoir, a tailgate chamber is arranged at the downstream of the main plant, and a main transformer chamber is arranged between the main plant and the tailgate chamber.
An emergency blow-down pipe is arranged in the lower reservoir.
In the step 4, a tail water pressure regulating chamber is arranged at the position, close to the main workshop, of the tail water tunnel.
The beneficial effects of the invention are as follows:
1) According to the tail water arrangement method for the pumped storage power station for crossing the large movable fracture, disclosed by the invention, the tail water open channel is used for connecting the tail water tunnel with the lower reservoir, the open channel is crossed and broken at a large angle, the influence range of the movable fracture on the open channel is reduced, the lower reservoir is arranged on the upper disc of the movable fracture, and the good digging and filling balance performance of the lower reservoir is ensured; the main power house is placed in the depth of a mountain, so that not only can the movable fracture be traversed, but also the reservoir dam, the downstream water inlet/outlet and the power generation main power house under the pumped storage power station can be ensured to be far away from the movable fracture, the influence of the movable fracture is reduced, and the anti-seismic safety is improved; the arrangement mode accords with the topography of northwest areas, the length of a tail water line can be greatly shortened, the engineering investment is reduced, the engineering safety is ensured, the method is suitable for construction of pumped storage power stations and new energy development in northwest areas, and the production and construction speed can be greatly improved;
2) The pressureless section tail water open channel is adopted to pass through the movable fracture, so that the excavation slope ratio of the tail water open channel can be slowed down, the construction risk is reduced, and the stability of the lower bank slope with greatly changed water level is ensured; a water retaining gate is arranged at the junction of the tailwater open channel and the lower reservoir, so that the water body flow between the upper reservoir and the tailwater open channel and between the tailwater open channel and the lower reservoir is ensured to be cut off rapidly in earthquake; the tail water open channel bottom plate is same as the lower reservoir bottom plate, the lower reservoir is provided with an emergency blow-down pipe, when destructive earthquake occurs, water flow between the upper reservoir and the lower reservoir can be cut off rapidly, water in the lower reservoir and the open channel is discharged rapidly, the tail water open channel can be repaired rapidly after the earthquake is finished, the function of the pumped storage power station is recovered as soon as possible, the loss is reduced to the minimum, the maintenance condition is easy to ensure, the arrangement mode is simple, and the system is safe and reliable.
Drawings
FIG. 1 is a schematic diagram of the method of tail water placement of a pumped storage power station of the present invention across a large active break;
fig. 2 is a cross-sectional view of fig. 1 of the present invention.
In the figure, a main plant, a main transformer chamber, a tail gate chamber, a tail water pressure regulating chamber, a tail water tunnel, a tail water overhauling gate chamber, a downstream water inlet/outlet, a tail water open channel, a water retaining gate, a lower reservoir, an emergency blow-down pipe, an active fracture, and a tail water forehearth are respectively arranged in the main plant, the main transformer chamber, the tail gate chamber, the tail water pressure regulating chamber, the tail water tunnel, the tail water overhauling gate chamber, the downstream water inlet/outlet, the tail water open channel, the tail water blocking gate, the lower reservoir, the emergency blow-down pipe, the active fracture and the tail water forehearth.
Detailed Description
The invention will be described in detail below with reference to the drawings and the detailed description.
The invention relates to a method for arranging tail water of a pumped storage power station for crossing large-scale active fracture, which is implemented by the following steps:
step 1, determining the position of a lower reservoir 10 according to the position of an active fracture 12, the topography and geological conditions, environmental protection water conservation sensitivity factors, land and civil migration, construction conditions and earth and stone balance conditions, and determining the position of an upper reservoir according to the position of the lower reservoir 10, the distance-to-height ratio and related data;
the lower reservoir 10 is positioned on the upper disc of the movable fracture 12, and the distance between the water retaining dam of the lower reservoir 10 and the movable fracture 12 is as follows: if the water retaining dam of the lower reservoir 10 is positioned on the upper disc of the movable fracture 12, the distance between the water retaining dam and the movable fracture 12 is not less than 400m; if the water retaining dam of the lower reservoir 10 is positioned at the lower disc of the movable fracture 12, the distance between the water retaining dam and the movable fracture 12 is not less than 600m.
An emergency blow-down pipe 11 is arranged in the lower reservoir 10, and the emergency blow-down pipe is suitable for short length, small excavation amount and small land feature area.
Step 2, the position of the main workshop 1 is planned according to the distance between the upper reservoir 10 and the lower reservoir 10 and related data;
the main plant 1 is arranged in the depth of the mountain and is far away from the movable fracture 12 as far as possible, and simultaneously, the regulation and guarantee requirements are met and the length of the auxiliary chamber is shortened.
Step 3, drawing up tail water lines according to the positions of the main plant 1 and the lower reservoir 10 and related data;
the tail water circuit of the pumped storage power station comprises a tail water tunnel 5, a tail water forehearth 13 and a tail water open channel 8 which are sequentially communicated. The tailwater open channel 8 is communicated with the lower reservoir 10, and the tailwater tunnel 5 is communicated with the main plant 1.
And the tail water open channels 8 are arranged according to the relative relation between the lower reservoir 10 and the movable fracture 12, and the bottom plate elevation of the tail water open channels 8 is the same as the bottom elevation of the lower reservoir 10, so that the lower reservoir and the water body in the tail water open channels can be discharged in emergency.
The tail water open channel 8 passes through the movable fracture 12 in a large angle, so that the included angle between the axis of the tail water open channel 8 and the trend of the movable fracture 12 is not smaller than 60 degrees, and the side slope height of the tail water open channel is reduced as much as possible;
the excavation slope ratio of the tail water open channel 8 is 1:1.4-1.7, the excavation supporting is simple and convenient, and the construction risk is small; the top of the tail water open channel 8 is connected with an external road, so that the traffic is convenient, and the later operation, overhaul and maintenance are convenient.
The tail water front pool 13 is arranged at the outlet of the tail water tunnel 5, the height difference between the bottom plate height of the tail water front pool 13 and the bottom plate height of the tail water open channel 8 is calculated through a water inlet submerged depth calculation formula, and the tail water front pool 13 and the tail water open channel 8 adopt slope transition, so that the submerged depth of the outlet of the tail water tunnel 5 can be ensured, and the suction funnel is prevented from being generated at the outlet of the tail water tunnel 5 and the downstream water inlet/outlet 7.
A downstream water inlet/outlet 7 is arranged in the tail water forehearth 13, and the distance between the downstream water inlet/outlet 7 and the movable fracture 12 is ensured to be more than 50m; the downstream water inlet/outlet 7 communicates the tailwater tunnel 5 with the tailwater open channel 8.
The tail water tunnel 5 comprises an upper flat section and a lower flat section, wherein the upper flat section and the lower flat section are connected by adopting a slope, an inclined shaft or a vertical shaft according to the height difference and the horizontal distance, and the upper flat Duan Gaocheng is determined by the bottom plate Gao Chengjia of the downstream water inlet/outlet 7 and the diameter of the tail water tunnel 5 by 0.5 times. The axis of the upper flat section of the tail water tunnel 5, the axis of the tail water forehearth 13 and the axis of the tail water open channel 8 are kept consistent and are intersected with the trend of the movable fracture 12 at a large angle, so that the length of the tail water open channel 8 affected by the movable fracture 12 can be ensured to be as short as possible.
A tail water tunnel overhaul gate chamber 6 is arranged at the position, close to the downstream water inlet/outlet 7, of the tail water tunnel 5, so that the water body flow between the upper reservoir and the tail water open channel 8 is cut off under the earthquake condition.
A water retaining gate 9 is arranged at the junction of the tailwater open channel 8 and the lower reservoir 10, so that the water flow between the tailwater open channel 8 and the lower reservoir 10 is ensured to be cut off under the earthquake condition. Because of the lack of water resources and large evaporation capacity in northwest areas, water is stored in the lower reservoir 10 as much as possible, so that the waste of water resources is avoided;
a main transformer chamber 2 is arranged between the main plant 1 and the tail gate chamber 3.
And step 4, checking the regulation guarantee of the water delivery system, so that the water pump turbine operates in a region with better speed regulation performance. And a tail water pressure regulating chamber 4 is arranged at the position, close to the main workshop 1, of the tail water tunnel 5, and the tail water pressure regulating chamber 4 can be set according to the requirement of a water delivery system on regulation and guarantee conditions.
A tail sluice chamber 3 is arranged at the downstream of the main plant 1, a tail sluice accident gate can be quickly put down under the condition of earthquake shutdown, and a tail water tunnel overhaul gate is put down after the water flow of the tail water tunnel tends to be static, so that the water coming from the upper reservoir is prevented from entering a tail water open channel 8, and the water in the upper reservoir is prevented from leaking through the tail water open channel 8.
According to the method for arranging the tail water of the pumped storage power station penetrating through the large movable fracture, when an earthquake with intensity higher than the fortification occurs, the tail water open channel 8 penetrates through the movable fracture 12, so that the probability is destroyed, and the related operation modes are as follows: firstly, closing a water pump turbine, and closing a draft tube accident gate in the tail gate chamber 3; after the water in the tail water tunnel 5 tends to be static, closing a gate of the tail water tunnel overhaul chamber 6 to isolate water between the upper reservoir and the tail water open channel 8; closing a water retaining gate 9 of the tail water open channel 8, isolating water between the tail water open channel 8 and a lower reservoir 10, and pumping water in the tail water open channel 8 by using a movable water pump to overhaul the tail water open channel 8.
If the open tail water channel 8 is seriously damaged, opening an emergency blow-down pipe 11 to empty water in the lower reservoir 10, and simultaneously opening a water retaining gate 9 of the open tail water channel 8 to create a dry construction environment for repairing the open tail water channel 8.
The tail water arrangement method of the pumped storage power station for crossing large movable breaks has the advantages that the tail water open channel 8 is connected with the tail water tunnel 5 and the lower reservoir 10, the tail water open channel 8 crosses the movable breaks 12 at a large angle, the influence range of the movable breaks 12 on the open channel is reduced, the lower reservoir 10 is arranged on the upper disc of the movable breaks 12, and good digging and filling balance performance is guaranteed; the main power house 1 is placed in the depth of a mountain, so that the main power house 1 can pass through the movable fracture 12, the reservoir 10 dam under the pumped storage power station, the downstream inlet/outlet 7 and the main power house 1 are ensured to be far away from the movable fracture 12 as much as possible, the influence of the movable fracture 12 is reduced, and the main power house is ensured to have good anti-seismic performance; the arrangement mode accords with the topography of northwest areas, the length of a water delivery system can be greatly shortened, the engineering investment is reduced, the engineering safety is ensured, the method is suitable for construction of pumped storage power stations and new energy development in northwest areas, and the production and construction speed can be greatly improved.
The pressureless section tail water open channel 8 is adopted to pass through the movable fracture 12, so that the excavation slope ratio of the open channel can be slowed down, the construction risk is reduced, and the stability of the downbank slope with greatly changed water level is ensured; a water retaining gate 9 is arranged at the junction of the tail water open channel 8 and the lower reservoir 10, so that the water flow between the tail water open channel 8 and the lower reservoir is ensured to be cut off rapidly in an earthquake; the bottom plate of the tailwater open channel 8 is as high as the bottom plate 10 of the lower reservoir, the lower reservoir 10 is provided with an emergency blow-down pipe 11, when a destructive earthquake occurs, the water flow between the upper reservoir and the lower reservoir can be cut off rapidly, the water in the lower reservoir and the open channel can be discharged rapidly, the tailwater open channel 8 can be repaired rapidly after the earthquake is finished, the function of the pumped storage power station can be recovered as soon as possible, the loss is reduced to the minimum, the maintenance condition is easy to ensure, the arrangement mode is simple, and the system is safe and reliable.
Example 1
The invention relates to a method for arranging tail water of a pumped storage power station for crossing large-scale active fracture, which is implemented by the following steps:
step 1, determining the position of a lower reservoir 10 according to the position of an active fracture 12, the topography and geological conditions, environmental protection water conservation sensitivity factors, land and civil migration, construction conditions and earth and stone balance conditions, and determining the position of an upper reservoir according to the position of the lower reservoir 10, the distance-to-height ratio and related data;
the lower reservoir 10 is positioned on the upper disc of the movable fracture 12, and the distance between the water retaining dam of the lower reservoir 10 and the movable fracture is as follows: if the water retaining dam of the lower reservoir 10 is positioned on the upper disc of the movable fracture 12, the distance between the water retaining dam and the movable fracture is not less than 400m; if the water retaining dam of the lower reservoir 10 is positioned at the lower disc of the movable fracture 12, the distance between the water retaining dam and the movable fracture 12 is not less than 600m.
An emergency blow-down pipe 11 is arranged in the lower reservoir 10.
Step 2, the position of the main workshop 1 is planned according to the distance between the upper reservoir 10 and the lower reservoir 10 and related data;
the main factory building 1 is arranged in the depth of the mountain body, is far away from the movable fracture 12 as far as possible, and meets the regulation and guarantee requirements and shortens the length of the auxiliary cavern.
Step 3, drawing up tail water lines according to the positions of the main plant 1 and the lower reservoir 10 and related data;
the tail water circuit of the pumped storage power station comprises a tail water tunnel 5, a tail water forehearth 13 and a tail water open channel 8 which are sequentially communicated, wherein the tail water open channel 8 is communicated with a lower reservoir 10, and the tail water tunnel 5 is communicated with a main workshop 1.
The tail water open channels 8 are arranged according to the positions of the lower reservoir 10 and the movable fracture 12, and the height of the bottom plate of the tail water open channels 8 is the same as the height of the bottom of the lower reservoir 10.
The tail water open channel 8 passes through the movable fracture 12 in a large angle, so that an included angle between the axis of the tail water open channel 8 and the trend of the movable fracture 12 is 80 degrees, and the side slope height of the tail water open channel is reduced as much as possible;
the excavation slope ratio of the tail water open channel 8 is 1:1.5, the excavation support is simple and convenient, and the construction risk is small; the top of the tail water open channel 8 is connected with an external road, so that the traffic is convenient, and the later operation, overhaul and maintenance are convenient.
The tail water front pool 13 is arranged at the outlet of the tail water tunnel 5, the height difference between the bottom plate height of the tail water front pool 13 and the bottom plate height of the tail water open channel 8 is calculated through a water inlet submerged depth calculation formula, the bottom plate height of the tail water front pool 13 is lower than the bottom plate height 13m of the tail water open channel 8, the tail water front pool 13 and the tail water open channel 8 adopt slope transition, the submerged depth of the outlet of the tail water tunnel 5 can be ensured, and the suction funnel is prevented from occurring at the outlet of the tail water tunnel 5 and the downstream water inlet/outlet 7.
A downstream water inlet/outlet 7 is arranged in the tail water foretank 13, and the distance between the downstream water inlet/outlet 7 and the movable fracture 12 is ensured to be 80m; the downstream water inlet/outlet 7 is communicated with the main workshop 1 through a tail water tunnel 5.
The tailwater tunnel 5 comprises an upper flat section and a lower flat section, the downstream water inlet/outlet 7 is communicated with the upper flat section, the upper flat section and the lower flat section are connected by adopting inclined shafts, the upper flat Duan Gaocheng is determined by 0.5 times of the tailwater tunnel diameter of a bottom plate Gao Chengjia of the downstream water inlet/outlet 7, the lower flat Duan Gaocheng is generally determined by 0.5 times of the tailwater tunnel 5 diameter of a bottom plate Gao Chengjia of the tailwater pipe, and the axis of the upper flat section of the tailwater tunnel 5, the axis of a tailwater foretank 13 and the axis of a tailwater open channel 8 are kept consistent and intersect with the trend of the movable fracture 12 at a large angle.
A tail water tunnel overhaul gate chamber 6 is arranged at the position of the tail water tunnel 5 close to the downstream water inlet/outlet 7.
A water retaining gate 9 is arranged at the junction of the tail water open channel 8 and the lower reservoir 10;
a main transformer chamber 2 is arranged between the main plant 1 and the tail gate chamber 3.
And step 4, checking the regulation guarantee of the water delivery system, so that the water pump turbine operates in a region with better speed regulation performance. And a tail water pressure regulating chamber 4 is arranged at a position, close to the main workshop 1, of the tail water tunnel 5.
Downstream of the main building 1 a sluice chamber 3 is arranged.
Example 2
The invention relates to a method for arranging tail water of a pumped storage power station for crossing large-scale active fracture, which is implemented by the following steps:
step 1, determining the position of a lower reservoir 10 according to the position of an active fracture 12, the topography and geological conditions, environmental protection water conservation sensitivity factors, land and civil migration, construction conditions and earth and stone balance conditions, and determining the position of an upper reservoir according to the position of the lower reservoir 10, the distance-to-height ratio and related data;
the lower reservoir 10 is positioned on the upper disc of the movable fracture 12, the water retaining dam of the lower reservoir 10 is positioned on the lower disc of the movable fracture 12, and the distance between the water retaining dam and the movable fracture 12 is 1000m.
An emergency blow-down pipe 11 is arranged in the lower reservoir 10.
Step 2, the position of the main workshop 1 is planned according to the distance between the upper reservoir 10 and the lower reservoir 10 and related data;
the main plant 1 is arranged in the depth of the mountain and is far away from the movable fracture 12 as far as possible, and simultaneously, the regulation and guarantee requirements are met and the length of the auxiliary chamber is shortened.
Step 3, drawing up tail water lines according to the positions of the main plant 1 and the lower reservoir 10 and related data;
the tail water circuit of the pumped storage power station comprises a tail water tunnel 5, a tail water forehearth 13 and a tail water open channel 8 which are sequentially communicated, wherein the tail water open channel 8 is communicated with a lower reservoir 10, and the tail water tunnel 5 is communicated with a main workshop 1.
The tail water open channels 8 are arranged according to the positions of the lower reservoir 10 and the movable fracture 12, and the height of the bottom plate of the tail water open channels 8 is the same as the height of the bottom of the lower reservoir 10.
The tail water open channel 8 passes through the movable fracture 12 in a large angle, so that an included angle between the axis of the tail water open channel 8 and the trend of the movable fracture 12 is ensured to be 70 degrees, and the side slope height of the tail water open channel is reduced as much as possible;
the excavation slope ratio of the tail water open channel 8 is 1:1.4, the excavation support is simple and convenient, and the construction risk is small; the top of the tail water open channel 8 is connected with an external road, so that the traffic is convenient, and the later operation, overhaul and maintenance are convenient.
The tail water front pool 13 is arranged at the outlet of the tail water tunnel 5, the height difference between the bottom plate height of the tail water front pool 13 and the bottom plate height of the tail water open channel 8 is calculated through a water inlet submerged depth calculation formula, and the tail water front pool 13 and the tail water open channel 8 adopt slope transition, so that the submerged depth of the outlet of the tail water tunnel 5 can be ensured, and the suction funnel is prevented from being generated at the outlet of the tail water tunnel 5 and the downstream water inlet/outlet 7.
A downstream water inlet/outlet 7 is arranged in the tail water foretank 13, and the distance between the downstream water inlet/outlet 7 and the movable fracture 12 is ensured to be 70m; the downstream water inlet/outlet 7 is communicated with the lower reservoir 10, and the downstream water inlet/outlet 7 is communicated with the main building 1 through the tail water tunnel 5.
The tail water tunnel 5 comprises an upper flat section and a lower flat section, the downstream water inlet/outlet 7 is communicated with the upper flat section, the upper flat section and the lower flat section are connected by a slope, and the upper flat Duan Gaocheng is determined by the bottom plate Gao Chengjia 0.5.5 times of the downstream water inlet/outlet 7. The axis of the upper flat section of the tail water tunnel 5, the axis of the tail water forehearth 13 and the axis of the tail water open channel 8 are all kept consistent, and are intersected with the trend of the movable fracture 12 at a large angle.
A tail water tunnel access gate chamber 6 is arranged near the downstream water inlet/outlet 7 of the tail water tunnel 5.
A water retaining gate 9 is arranged at the junction of the tail water open channel 8 and the lower reservoir 10;
a main transformer chamber 2 is arranged between the main plant 1 and the tail gate chamber 3.
And step 4, checking the regulation guarantee of the water delivery system, so that the water pump turbine operates in a region with better speed regulation performance. And a tail water pressure regulating chamber 4 is arranged at a position, close to the main workshop 1, of the tail water tunnel 5.
Downstream of the main building 1 a sluice chamber 3 is arranged.
Example 3
The invention relates to a method for arranging tail water of a pumped storage power station for crossing large-scale active fracture, which is implemented by the following steps:
step 1, determining the position of a lower reservoir 10 according to the position of an active fracture 12, the topography and geological conditions, environmental protection water conservation sensitivity factors, land and civil migration, construction conditions and earth and stone balance conditions, and determining the position of an upper reservoir according to the position of the lower reservoir 10, the distance-to-height ratio and related data;
the lower reservoir 10 is positioned on the upper disc of the movable fracture 12, the water retaining dam of the lower reservoir 10 is positioned on the upper disc of the movable fracture 12, and the distance between the water retaining dam and the movable fracture 12 is 800m.
An emergency blow-down pipe 11 is arranged in the lower reservoir 10.
Step 2, the position of the main workshop 1 is planned according to the distance between the upper reservoir 10 and the lower reservoir 10 and related data;
the main plant 1 is arranged in the depth of the mountain and is far away from the movable fracture 12 as far as possible, and simultaneously, the regulation and guarantee requirements are met and the length of the auxiliary chamber is shortened.
Step 3, drawing up tail water lines according to the positions of the main plant 1 and the lower reservoir 10 and related data;
the tail water circuit of the pumped storage power station comprises a tail water tunnel 5, a tail water forehearth 13 and a tail water open channel 8 which are sequentially communicated, wherein the tail water open channel 8 is communicated with a lower reservoir 10, and the tail water tunnel 5 is communicated with a main workshop 1.
The tail water open channels 8 are arranged according to the positions of the lower reservoir 10 and the movable fracture 12, and the height of the bottom plate of the tail water open channels 8 is the same as the height of the bottom of the lower reservoir 10.
The tail water open channel 8 passes through the movable fracture 12 in a large angle, so that an included angle between the axis of the tail water open channel 8 and the trend of the movable fracture 12 is ensured to be 75 degrees, and the side slope height of the tail water open channel is reduced as much as possible;
the excavation slope ratio of the tail water open channel 8 is 1:1.7, the excavation support is simple and convenient, and the construction risk is small; the top of the tail water open channel 8 is connected with an external road, so that the traffic is convenient, and the later operation, overhaul and maintenance are convenient.
The tail water front pool 13 is arranged at the outlet of the tail water tunnel 5, the height difference between the bottom plate height of the tail water front pool 13 and the bottom plate height of the tail water open channel 8 is calculated through a water inlet submerged depth calculation formula, and the tail water front pool 13 and the tail water open channel 8 adopt slope transition, so that the submerged depth of the outlet of the tail water tunnel 5 can be ensured, and the suction funnel is prevented from being generated at the outlet of the tail water tunnel 5 and the downstream water inlet/outlet 7.
A downstream water inlet/outlet 7 is arranged in the tail water forehearth 13, and the distance between the downstream water inlet/outlet 7 and the movable fracture 1 is ensured to be 60m; the downstream water inlet/outlet 7 is communicated with the lower reservoir 10 through the tailwater open channel 8, and the downstream water inlet/outlet 7 is communicated with the main plant 1 through the tailwater tunnel 5.
The tail water tunnel 5 comprises an upper flat section and a lower flat section, the downstream water inlet/outlet 7 is respectively communicated with the upper flat section, vertical shaft transition is adopted between the upper flat section and the lower flat section, the upper flat Duan Gaocheng is determined by the tail water tunnel diameter which is 0.5 times that of the bottom plate Gao Chengjia of the downstream water inlet/outlet 7, and the axis of the upper flat section of the tail water tunnel 5, the axis of the tail water forebay 13 and the axis of the tail water open channel 8 are kept consistent and are intersected with the trend of the movable fracture 12 at a large angle.
A tail water tunnel access gate chamber 6 is arranged near the downstream water inlet/outlet 7 of the tail water tunnel 5.
A water retaining gate 9 is arranged at the junction of the tail water open channel 8 and the lower reservoir 10;
a main transformer chamber 2 is arranged between the main plant 1 and the tail gate chamber 3.
And step 4, checking the regulation guarantee of the water delivery system, so that the water pump turbine operates in a region with better speed regulation performance. And a tail water pressure regulating chamber 4 is arranged at a position, close to the main workshop 1, of the tail water tunnel 5.
Downstream of the main building 1 a sluice chamber 3 is arranged.
Claims (10)
1. The tail water arrangement method of the pumped storage power station for crossing the large-scale movable fracture is characterized by comprising the following steps of:
step 1, determining the position of a lower reservoir (10) according to the position of the movable fracture (12) and related data, and determining the position of an upper reservoir by combining the distance-to-height ratio and the related data;
step 2, the position of a main workshop (1) is planned according to the distance between the upper reservoir and the lower reservoir (10) and related data;
step 3, drawing up tail water lines according to the positions of the main plant (1) and the lower reservoir (10) and related data; the tail water line comprises a tail water tunnel (5), a tail water forehearth (13) and a tail water open channel (8) which are sequentially arranged between the main plant (1) and the lower reservoir (10) and are communicated with each other, and the tail water open channel (8) passes through the movable fracture (12);
and step 4, checking the regulation guarantee of the water delivery system, so that the water pump turbine operates in a region with better speed regulation performance.
2. The pumped storage power station tail water disposal method for traversing large-scale active fractures according to claim 1, wherein in step 1, said related information comprises: topography geological conditions, environment-friendly water conservation sensitive factors, land and civil migration, construction conditions and earth and stone balance conditions;
the lower reservoir (10) is positioned on the upper disc of the movable fracture (12), and the distance between the water retaining dam of the lower reservoir (10) and the movable fracture (12) is as follows: if the water retaining dam of the lower reservoir (10) is positioned on the upper disc of the movable fracture (12), the distance between the water retaining dam and the movable fracture (12) is not less than 400m; if the water retaining dam of the lower reservoir (10) is positioned at the lower disc of the movable fracture (12), the distance between the water retaining dam and the movable fracture is not less than 600m.
3. The method for arranging tail water of a pumped storage power station passing through a large movable fracture according to claim 1, wherein in the step 2, the main plant (1) is arranged deep in a mountain and far away from the movable fracture (12), and simultaneously meets the regulation guarantee requirement and shortens the length of an auxiliary cavity.
4. The method for arranging tail water of a pumped storage power station for traversing large-scale active fractures according to claim 1, wherein the elevation of a bottom plate of the tail water open channel (8) is the same as the elevation of a bottom of a reservoir bottom of the lower reservoir (10), an included angle between the axis of the tail water open channel (8) and the trend of the active fractures (12) is not less than 60 degrees, and the excavation slope ratio of the tail water open channel (8) is 1:1.4-1.7.
5. The method for arranging tail water of a pumped storage power station for traversing large-scale active fractures according to claim 1, wherein in the step 3, the height difference between the bottom plate height of the front tail water pool (13) and the bottom plate height of the open tail water channel (8) is calculated through a water inlet submerged depth calculation formula, and the front tail water pool (13) and the open tail water channel (8) are in slope transition;
a downstream water inlet/outlet (7) is arranged in the tailwater forehearth (13), the distance between the downstream water inlet/outlet (7) and the movable fracture (12) is larger than 50m, the downstream water inlet/outlet (7) is communicated with the main workshop (1) through the tailwater tunnel (5), and the downstream water inlet/outlet (7) is communicated with the tailwater tunnel (5) and the tailwater open channel (8).
6. The method for arranging tail water of a pumped storage power station for traversing large-scale movable fractures according to claim 5, wherein the tail water tunnel (5) comprises an upper flat section and a lower flat section, the upper flat section and the lower flat section are connected by adopting a slope, an inclined shaft or a vertical shaft, the axis of the upper flat section of the tail water tunnel (5), the axis of the tail water foretank (13) and the axis of the tail water open channel (8) are kept consistent, and the upper flat section is communicated with a downstream water inlet/outlet (7).
7. The method of arranging tail water of a pumped storage power station through a large-scale active fracture according to claim 6, characterized in that a tail water tunnel access gate chamber (6) is arranged near the downstream water inlet/outlet (7) of the tail water tunnel (5).
8. The method for arranging tail water of a pumped storage power station passing through large-scale movable fracture according to claim 1, wherein a water retaining gate (9) is arranged at the junction of a tail water open channel (8) and a lower reservoir (10), a tail gate chamber (3) is arranged at the downstream of a main plant (1), and a main transformer chamber (2) is arranged between the main plant (1) and the tail gate chamber (3).
9. The method for arranging tail water of a pumped storage power station for traversing large-scale active fractures according to claim 1, wherein an emergency blow-down pipe (11) is arranged in the lower reservoir (10).
10. The method for arranging tail water of a pumped storage power station for traversing large-scale movable fractures according to claim 1, wherein in step 4, a tail water pressure regulating chamber (4) is arranged in the tail water tunnel (5) close to the main plant (1).
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| CN202311132277.5A CN117272455A (en) | 2023-09-04 | 2023-09-04 | Tail water arrangement method for pumped storage power station penetrating through large-scale movable fracture |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117574518A (en) * | 2024-01-15 | 2024-02-20 | 国网湖北省电力有限公司经济技术研究院 | Modeling method and system for three-dimensional geological model of underground factory building of pumped storage power station |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117574518A (en) * | 2024-01-15 | 2024-02-20 | 国网湖北省电力有限公司经济技术研究院 | Modeling method and system for three-dimensional geological model of underground factory building of pumped storage power station |
| CN117574518B (en) * | 2024-01-15 | 2024-04-09 | 国网湖北省电力有限公司经济技术研究院 | Modeling method and system for three-dimensional geological model of underground factory building of pumped storage power station |
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