CN118008666B - System and method for improving suction height of pumped storage power station by changing conventional mixed-flow power station into pumped storage power station - Google Patents
System and method for improving suction height of pumped storage power station by changing conventional mixed-flow power station into pumped storage power station Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 10
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- 238000011144 upstream manufacturing Methods 0.000 claims abstract description 79
- 238000005086 pumping Methods 0.000 claims abstract description 13
- 238000009933 burial Methods 0.000 claims abstract description 9
- 238000009792 diffusion process Methods 0.000 claims description 67
- 238000002347 injection Methods 0.000 claims description 30
- 239000007924 injection Substances 0.000 claims description 30
- 230000006872 improvement Effects 0.000 claims description 21
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- 238000010248 power generation Methods 0.000 abstract description 24
- 238000010586 diagram Methods 0.000 description 2
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- 238000006467 substitution reaction Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
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Abstract
The invention discloses a suction height improving system and a suction height improving method for a conventional mixed flow power station, wherein the suction height improving system comprises a hydraulic lifting device immersed in water in a downstream water reservoir and a middle position water tank arranged above the downstream water level, the hydraulic lifting device is connected with the middle position water tank, water in the downstream water reservoir is lifted into the middle position water tank by utilizing the water level difference between an upstream water reservoir and the downstream water reservoir, the middle position water tank is connected with a second water pipe through a connecting pipe, a water pump water turbine unit pumps water in the middle position water tank into an upstream water reservoir under the water pump water pumping working condition, and the water in the middle position water tank is used for lifting the burial depth of the water pump water turbine unit so as to meet the suction height requirement of the water pump water turbine unit. The hydraulic lifting device can meet the requirement of the water pump and water turbine set on the suction height, and the conventional mixed flow power station is rebuilt into a pumped storage power station under the condition that the water delivery power generation system and the factory building structure are unchanged, so that the water pump and water turbine set can normally operate under the water pump pumping working condition.
Description
Technical Field
The invention belongs to the technical field of hydropower stations, and particularly relates to a suction height improvement system and method for a conventional mixed-flow power station to be changed into a pumped storage power station.
Background
With the increasing severity of world energy crisis, climate warming and other problems, more and more new energy forms are connected into a power system, by 2023, the installed capacity of full-caliber power generation in China is 27.9 hundred million kW in 9 months, the installed capacity of non-fossil energy power generation is 14.6 hundred million kW and the proportion of the installed capacity of full-caliber power generation is 52.3%, the installed capacity of wind power generation is 4.0 hundred million kW, the installed capacity of solar power generation is 5.2 hundred million kW, the installed capacity of hydroelectric power generation is 4.2 hundred million kW, and the total installed capacity of wind power generation and solar power generation is 63% of the installed capacity of non-fossil energy power generation. The ratio of new energy power generation such as wind power, solar energy and the like in the power system continuously rises, and due to the characteristics of intermittence, randomness and fluctuation of wind power generation and solar power generation, the new energy power generation with strong regulation is urgently needed to be matched with the new energy power generation, so that the low carbon of the energy system and the safety and stability of the power system are ensured.
The pumped storage has various functions such as peak regulation, valley filling, frequency modulation, phase modulation, accident standby and the like, has quick response and strong adjustability, and plays an important role in ensuring the safe, stable and economic operation of the power system. The main capacity of the pump storage power station arranged in the national pump storage medium and long term development planning (2021-2035) is about 4.21 hundred million kW, the installed capacity of the pump storage power station is 0.5 hundred million kW, and the installed capacity gap is 3.71 hundred million kW from the target. Most of the existing hydropower stations are conventional mixed-flow power stations, the units of the conventional mixed-flow power stations only have a power generation function and have no pumping function, so that the conventional mixed-flow power stations have a single function, the units of the pumped-storage power stations have both the power generation function and the pumping function, and therefore the pumped-storage power stations are complete in function.
The technical problem to be solved first time by rebuilding the conventional mixed-flow power station into the pumped storage power station is the contradiction between the suction height of the conventional mixed-flow power station unit and the suction height of the pumped storage power station unit on the premise of not changing the existing factory building structure, wherein the unit is arranged outside the downstream water reservoir, the height of the top end of the unit is lower than the water surface height of the downstream water reservoir, and the suction height represents the difference between the height of the position of the unit and the water surface height of the downstream water reservoir. The suction height Hs of the conventional mixed flow power station unit is basically in the (-10 m, -25 m) range, the suction height Hs of the pumped storage power station unit is mainly distributed in the (-30 m, -90 m) range, and the suction height of the pure pumped storage power station unit with ultra-high water head can break through-100 m. Under the condition that the upstream water level, the downstream water level and the kinetic energy are the same, the suction height of the pumped storage power station unit is lower than that of the conventional mixed flow power station unit, and the burial depth is large.
The water delivery power generation system and the factory building structure of the conventional mixed flow power station before transformation are shaped, and the unit suction height meets the unit requirement of the conventional mixed flow power station; the improved pumped storage power station needs to be lifted in depth under the condition that the original water delivery power generation system and the factory building structure are unchanged, and the requirement of the pumped storage power station on the suction height is guaranteed.
Disclosure of Invention
In view of the defects of the prior art, the invention provides a suction height improvement system and a suction height improvement method for a conventional mixed flow power station, which are changed into a pumped storage power station, wherein a hydraulic lifting device can meet the suction height requirement of a water pump turbine unit, so that the conventional mixed flow power station is changed into the pumped storage power station under the condition that the water delivery power generation system and the factory building structure are unchanged, and the water pump turbine unit can normally operate under the water pump pumping working condition.
The technical scheme adopted for solving the technical problems is as follows:
The suction height improvement system comprises a hydraulic lifting device immersed in the water body of the downstream water reservoir and a middle position water pool arranged above the water level surface of the downstream water reservoir, wherein the water level of the water pump water turbine set is lower than the water level of the downstream water reservoir, the water pump water turbine set is connected with the upstream water reservoir through a first water pipe and connected with the downstream water reservoir through a second water pipe, the hydraulic lifting device is connected with the middle position water pool and utilizes the water level difference between the upstream water reservoir and the downstream water reservoir to lift water in the downstream water pool into the middle position water pool, the middle position water pool is connected with the second water pipe, the water pump water turbine set pumps water in the water pool into the upstream water reservoir under the water pump water pumping working condition, and the water pump water turbine set is used for sucking water in the water pump water turbine set to meet the water demand of the water pump depth of the water turbine set.
Further, the hydraulic lifting device comprises a high-pressure injection pipe and a mixing diffusion pipe, wherein the upstream end of the high-pressure injection pipe is connected with an upstream water reservoir, the downstream end of the high-pressure injection pipe is connected with a jet nozzle, the upstream end of the mixing diffusion pipe is connected with one of the opening ends of the receiving chamber, the downstream end of the mixing diffusion pipe is connected with a median water pool, the jet end of the jet nozzle extends into the receiving chamber from the other opening end of the receiving chamber, and the hydraulic lifting device is used for mixing and exchanging energy between high-pressure water flow in the upstream water reservoir and low-pressure water flow in a downstream reservoir in the receiving chamber and the mixing diffusion pipe and guiding the formed median mixed water flow into the median water pool.
Further, the hydraulic lifting device further comprises a flow gathering cover, and the receiving chamber, the downstream section of the high-pressure injection pipe and the upstream section of the mixing diffusion pipe are all positioned in the flow gathering cover.
Further, the receiving chamber is in a horn shape, the small-diameter opening end of the receiving chamber is connected with the upstream end of the mixing diffusion pipe, and the injection end of the jet nozzle extends into the receiving chamber from the large-diameter opening end of the receiving chamber.
Further, the mixing diffusion pipe comprises a first mixing diffusion section, a second mixing diffusion section and a third mixing diffusion section which are sequentially connected from upstream to downstream, the inner diameter of the first mixing diffusion section is smaller than that of the third mixing diffusion section, and the second mixing diffusion section is in a round table shape.
Further, the axes of the jet nozzle, the receiving chamber, the first mixing diffusion section, the second mixing diffusion section and the flow gathering cover are coincident.
Further, the upstream end of the connecting pipe penetrates through the bottom wall of the middle water tank and extends into the middle water tank, and the downstream end of the connecting pipe is connected with the second water pipe; the downstream end of the mixing diffusion tube passes through the bottom wall of the neutral water tank and extends into the neutral water tank.
The suction height improvement method for changing the conventional mixed-flow power station into the pumped storage power station adopts the suction height improvement system for changing the conventional mixed-flow power station into the pumped storage power station to improve, and specifically comprises the following steps: the hydraulic lifting device lifts water in the downstream reservoir to a middle-position water tank, the water in the middle-position water tank lifts the burial depth of a water pump turbine unit, the requirement of the water pump turbine unit on the suction height is met, the water pump turbine unit is guaranteed to normally operate under a water pump pumping working condition, and the water pump turbine unit pumps water in the middle-position water tank to the upstream reservoir through a connecting pipe, a second water pipe and a first water pipe in sequence under the water pump pumping working condition.
Further, the hydraulic lifting device lifts water in a downstream reservoir into a middle-position water pool, specifically: the high-pressure water in the upstream reservoir flows through the high-pressure injection pipe to be drained, low-pressure water flow which is formed at the jet nozzle and catches low-pressure water flow in the downstream reservoir is formed, the high-pressure water flow in the upstream reservoir and the low-pressure water flow in the downstream reservoir are mixed in the receiving chamber and the mixing diffusion pipe to exchange energy, and the formed medium-pressure mixed water flow is led into the middle-position water pool through the mixing diffusion pipe.
Further, the hydraulic lifting device lifts water in a downstream reservoir into a middle-position water pool, specifically: the high-pressure water in the upstream reservoir flows through the high-pressure injection pipe for drainage, low-pressure water flow which is formed at the jet nozzle and is sucked in the downstream reservoir is formed, a good sucking effect is formed under the rectifying and guiding effects of the flow collecting cover, the high-pressure water flow in the upstream reservoir and the low-pressure water flow in the downstream reservoir are mixed in the receiving chamber and the mixing diffusion pipe for energy exchange, and the formed medium-pressure mixed water flow is led into the middle-position water pool through the mixing diffusion pipe.
Compared with the prior art, the invention has the beneficial effects that:
The invention relates to a suction height improvement system of a conventional mixed flow power station, which is changed into a pumped storage power station, and comprises a hydraulic lifting device immersed in a water body of a downstream water reservoir and a middle position water tank arranged above a downstream water level, wherein the hydraulic lifting device is connected with the middle position water tank and is used for lifting water in the downstream water reservoir to the middle position water tank by utilizing the water level difference between an upstream water reservoir and the downstream water reservoir, the middle position water tank is connected with a second water pipe through a connecting pipe, a water pump water turbine unit pumps water in the middle position water tank to the upstream water reservoir under the water pump water pumping working condition, and the water in the middle position water tank is used for lifting the burial depth of the water pump water turbine unit; the hydraulic lifting device can lift water in the downstream reservoir to the middle position water pool by utilizing the water level difference between the upstream reservoir and the downstream reservoir, and the middle position water pool is positioned at the position above the downstream water level, so that the top end of the water pump water turbine unit is lower than the height of the downstream water level, and the middle position water pool is connected with the second water pipe of the water pump water turbine unit through the connecting pipe, thus the water in the middle position water pool can lift the burial depth of the water pump water turbine unit, further the requirement of the water pump water turbine unit on the suction height can be met, the conventional mixed-flow power station is changed into a pumped storage power station under the condition that the water delivery power generation system and the factory building structure are unchanged, the lower suction height requirement of the water pump water turbine unit of the pumped storage power station is guaranteed, and the water pump water turbine unit can normally run under the water pump suction condition.
The hydraulic lifting device comprises a high-pressure injection pipe and a mixing diffusion pipe, wherein the upstream end of the high-pressure injection pipe is connected with an upstream water reservoir, the downstream end of the high-pressure injection pipe is connected with a jet nozzle, the upstream end of the mixing diffusion pipe is connected with one opening end of a receiving chamber, the downstream end of the mixing diffusion pipe is connected with a middle-position water pool, the jet end of the jet nozzle extends into the receiving chamber from the other opening end of the receiving chamber, and the hydraulic lifting device is used for mixing high-pressure water flow in the upstream water reservoir and low-pressure water flow in a downstream reservoir in the receiving chamber and the mixing diffusion pipe, exchanging energy and guiding the formed middle-pressure mixed water flow into the middle-position water pool; the high-pressure water in the upstream reservoir flows through the high-pressure injection pipe to be led, low-pressure water flow in the downstream reservoir is formed at the jet nozzle and is sucked, the high-pressure water flow in the upstream reservoir and the low-pressure water flow in the downstream reservoir are mixed in the receiving chamber and the mixing diffusion pipe to exchange energy, and the formed medium-pressure mixed water flow is led into the middle-position water pool through the mixing diffusion pipe, so that the hydraulic lifting device can continuously and stably lift the water in the downstream reservoir into the middle-position water pool by utilizing the water level difference of the upstream reservoir and the downstream reservoir without external power.
In the invention, the hydraulic lifting device also comprises a flow gathering cover, and the receiving chamber, the downstream section of the high-pressure injection pipe and the upstream section of the mixing diffusion pipe are all positioned in the flow gathering cover; thus, high-pressure water in the upstream reservoir is drained through the high-pressure injection pipe, low-pressure water in the downstream reservoir is sucked by the jet nozzle, and a good sucking effect is formed under the rectifying and guiding effects of the flow gathering cover.
Drawings
FIG. 1 is a schematic perspective view of an upstream reservoir and a downstream reservoir not shown in a pumped-storage power station suction height improvement system of a conventional mixed-flow power station of the present invention;
FIG. 2 is a schematic perspective view of another direction of FIG. 1;
FIG. 3 is a schematic perspective view of another direction of FIG. 2;
FIG. 4 is a schematic diagram of the construction of the pumped storage power station suction height improvement system of the present invention showing the upstream reservoir and downstream reservoir in a conventional mixed flow power station;
FIG. 5 is a schematic view of a perspective and enlarged structure of the hydraulic lifting device in FIG. 3 in another direction;
FIG. 6 is a schematic perspective view of another direction of FIG. 5;
fig. 7 is a simulation vector diagram of the hydraulic lifting device of the present invention.
The reference numerals in the drawings illustrate: 1. the water pump turbine unit, 2, the downstream reservoir, 3, the downstream water level, 4, first raceway, 401, the upstream water inlet, 5, the upstream water reservoir, 6, the second raceway, 601, the downstream water inlet, 7, the middle position pond, 8, the connecting pipe, 9, the high-pressure injection pipe, 901, the lifting water inlet, 10, the mixed diffusion pipe, 1001, the first mixed diffusion section, 1002, the second mixed diffusion section, 1003, the third mixed diffusion section, 11, the jet nozzle, 12, the receiving chamber, 13, the collection cover.
Detailed Description
The following describes the embodiments of the present invention in further detail with reference to the accompanying drawings. These embodiments are merely illustrative of the present invention and are not intended to be limiting.
In the description of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, merely to facilitate description of the present invention and simplify the description, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
As shown in fig. 1-4, a suction height improvement system of a conventional mixed flow power station is changed into a suction height improvement system of a pumped storage power station, a water pump water turbine unit 1 of the pumped storage power station is the same as a water turbine unit of the conventional mixed flow power station in installation position, the water pump water turbine unit 1 is arranged outside a downstream reservoir 2, the top height of the water pump water turbine unit 1 is lower than the water surface height of the downstream reservoir 2, the water surface of the downstream reservoir 2 forms a downstream water level 3, the water pump water turbine unit 1 is connected with an upstream reservoir 5 through a first water pipe 4 and is connected with the downstream reservoir 2 through a second water pipe 6, the suction height improvement system comprises a hydraulic lifting device immersed in water in the downstream reservoir 2 and a middle position water pool 7 arranged above the downstream water level 3, the hydraulic lifting device is connected with the middle position water pool 7, water in the downstream reservoir 2 is lifted to the middle position water pool 7 by utilizing the water level difference between the upstream reservoir 5 and the downstream reservoir 2, the middle position water pool 7 is connected with the second water pipe 6 through a connecting pipe 8, the water pump water turbine unit 1 is connected with the downstream water turbine unit 2 through a second water pipe 6, the water pump water turbine unit 1 is lifted into the water pump water pool 7 under the water pump height requirement of the water turbine unit 1, and the water pump 1 is high in the water pump water level water pump 1. Wherein the junction of the first water pipe 4 and the upstream water reservoir 5 forms an upstream water gap 401, the upstream water gap 401 is positioned at a position below the water surface of the upstream water reservoir 5, the junction of the second water pipe 6 and the downstream water reservoir 2 forms a downstream water gap 601, and the downstream water gap 601 is positioned at a position below the water surface of the downstream water reservoir 2.
The hydraulic lifting device can lift water in the downstream reservoir 2 to the middle position water tank 7 by utilizing the water level difference between the upstream reservoir 5 and the downstream reservoir 2, and the middle position water tank 7 is positioned above the downstream water level 3, so that the top end of the water pump water turbine unit 1 is lower than the height of the downstream water level 3, and the middle position water tank 7 is connected with the second water pipe 6 of the water pump water turbine unit 1 through the connecting pipe 8, thus the water in the middle position water tank 7 can lift the burial depth of the water pump water turbine unit 1, further the requirement of the water pump water turbine unit 1 on the suction height can be met, the conventional mixed flow power station is rebuilt into a pumped storage power station under the condition of unchanged water delivery power generation system and factory building structure, and the lower suction height requirement of the water pump water turbine unit 1 of the pumped storage power station is ensured, so that the water pump water turbine unit 1 can normally operate under the water pump suction working condition is ensured.
Wherein the first water pipe 4 and the second water pipe 6 form a water delivery power generation system.
Preferably, the upstream end of the connecting pipe 8 passes through the bottom wall of the neutral water tank 7 and extends into the neutral water tank 7, and the downstream end of the connecting pipe 8 is connected to the second water pipe 6.
In one embodiment of the present invention, in one embodiment,
As shown in fig. 5 to 6, the hydraulic lifting device comprises a high-pressure injection pipe 9 and a mixing diffusion pipe 10, wherein the upstream end of the high-pressure injection pipe 9 is connected with the upstream reservoir 5, the downstream end of the high-pressure injection pipe is connected with a jet nozzle 11, the upstream end of the mixing diffusion pipe 10 is connected with one opening end of a receiving chamber 12, the downstream end of the mixing diffusion pipe passes through the bottom wall of a middle-position water pool 7 and stretches into the middle-position water pool 7, the jet end of the jet nozzle 11 stretches into the receiving chamber 12 from the other opening end of the receiving chamber 12, and the hydraulic lifting device is used for mixing and exchanging energy between the high-pressure water flow in the upstream reservoir 5 and the low-pressure water flow in the downstream reservoir 2 in the receiving chamber 12 and the mixing diffusion pipe 10 and guiding the formed middle-pressure mixed water flow into the middle-position water pool 7. Wherein, the joint of the upstream end of the high-pressure injection pipe 9 and the upstream water reservoir 5 forms a lifting water gap 901, and the lifting water gap 901 is positioned at a position below the water surface of the upstream water reservoir 5.
Thus, the high-pressure water in the upstream water reservoir 5 is led through the high-pressure injection pipe 9, low-pressure water in the downstream water reservoir 2 is formed at the jet nozzle 11 and is sucked, the high-pressure water in the upstream water reservoir 5 and the low-pressure water in the downstream water reservoir 2 are mixed in the receiving chamber 12 and the mixing diffusion pipe 10 and are subjected to energy exchange, and the formed medium-pressure mixed water flow is led into the middle-position water pool 7 through the mixing diffusion pipe 10, so that the hydraulic lifting device can continuously and stably lift the water in the downstream water reservoir 2 into the middle-position water pool 7 by utilizing the water level difference of the upstream water reservoir 5 and the downstream water reservoir 2 without external power.
Preferably, the hydraulic lifting device further comprises a flow-gathering hood 13, the receiving chamber 12, the downstream section of the high-pressure injection pipe 9 and the upstream section of the mixing and diffusing pipe 10 being located inside the flow-gathering hood 13, see fig. 5-6. Thus, high-pressure water in the upstream water reservoir 5 is drained through the high-pressure injection pipe 9, low-pressure water is formed at the jet nozzle 11 and sucked into the downstream water reservoir 2, and a good sucking effect is formed under the rectifying and guiding effects of the flow collecting cover 13.
Preferably, the receiving chamber 12 has a horn shape, the small diameter open end of the receiving chamber 12 is connected to the upstream end of the mixing diffusion tube 10, and the injection end of the jet nozzle 11 extends from the large diameter open end of the receiving chamber 12 into the receiving chamber 12, see fig. 5 to 6. This facilitates the collection of the low-pressure water flow in the downstream reservoir 2 entrained at the jet nozzle 11 through the receiving chamber 12 into the mixing diffuser 10, aided by the trumpet-shaped receiving chamber 12.
Preferably, the mixing diffusion pipe 10 includes a first mixing diffusion section 1001, a second mixing diffusion section 1002, and a third mixing diffusion section 1003 connected in this order from upstream to downstream, the first mixing diffusion section 1001 having an inner diameter smaller than that of the third mixing diffusion section 1003, the second mixing diffusion section 1002 having a circular truncated cone shape, see fig. 5. Thus, the flow rate of the high-pressure water flow in the upstream water reservoir 5 and the low-pressure water flow in the downstream water reservoir 2 sucked up at the jet nozzle 11 increases when the high-pressure water flow enters the first mixing and diffusing section 1001 having a smaller inner diameter from the receiving chamber 12 having a larger space, and since the inner diameter of the first mixing and diffusing section 1001 is smaller than the inner diameter of the third mixing and diffusing section 1003, the second mixing and diffusing section 1002 has a truncated cone shape, the first mixing and diffusing section 1001 and the third mixing and diffusing section 1003 are connected by the second mixing and diffusing section 1002, so that the flow rate of the medium-pressure mixed water flow formed in the first mixing and diffusing section 1001 is larger than the flow rate in the second mixing and diffusing section 1002 is larger than the flow rate in the third mixing and diffusing section 1003.
Preferably, the axes of the jet nozzle 11, the receiving chamber 12, the first mixing diffuser 1001, the second mixing diffuser 1002 and the flow-gathering cap 13 coincide, see fig. 5.
The suction height improvement method for changing the conventional mixed-flow power station into the pumped storage power station adopts the suction height improvement system for changing the conventional mixed-flow power station into the pumped storage power station to improve, and specifically comprises the following steps: the high-pressure water flow in the upstream water reservoir 5 is led through the high-pressure injection pipe 9, the low-pressure water flow which is formed at the jet nozzle 11 and is sucked into the downstream water reservoir 2 is formed, a good sucking effect is formed under the rectifying and guiding effects of the flow gathering cover 13, the high-pressure water flow in the upstream water reservoir 5 and the low-pressure water flow in the downstream water reservoir 2 are mixed in the receiving chamber 12 and the mixing diffusion pipe 10 and are subjected to energy exchange, the formed medium-pressure mixed water flow is led into the middle-position water pool 7 through the mixing diffusion pipe 10, the water in the middle-position water pool 7 lifts the burial depth of the water pump water turbine unit 1, the requirement of the water pump water turbine unit 1 on the sucking height is met, the water pump water turbine unit 1 is guaranteed to normally operate under the water pump pumping working condition, and the water in the middle-position water pool 7 is pumped into the upstream water reservoir 5 through the connecting pipe 8, the second water pipe 6 and the first water pipe 4 in sequence.
Under the power generation working condition of the water turbine, the water in the upstream water reservoir 5 flows into the water pump turbine unit 1 through the first water pipe 4 and pushes the water pump turbine unit 1 to generate power, and then the water in the water pump turbine unit 1 is discharged into the downstream water reservoir 2 from the second water pipe 6.
Wherein, as shown in fig. 7, the high-pressure water flow forms a high-speed jet flow at the jet nozzle 11, the low-pressure water flow in the downstream water reservoir 2 is sucked and converged into the receiving chamber 12 at a low speed in the flow collecting cover 13, and the high-pressure water flow and the low-pressure water flow exchange energy in the mixing and diffusing pipe 10, and finally a medium-pressure mixed water flow is formed, wherein, the black arrow at the jet nozzle 11 in fig. 7 represents a high-pressure water flow velocity vector, the black arrow in the flow collecting cover 13 represents a sucked low-pressure water flow velocity vector, and the black arrow in the mixing and diffusing pipe 10 represents a formed medium-pressure mixed water flow velocity vector.
In addition, when the conventional mixed current power station is a conventional mixed current power station with high water head, the water in the downstream water reservoir 2 is lifted into the middle water pool 7 by the hydraulic lifting device and by utilizing the water level difference between the upstream water reservoir 5 and the downstream water reservoir 2, the potential energy loss of the high-pressure water flow of the upstream water reservoir 5 is large, and a lifting pump can be arranged in the water body of the downstream water reservoir 2 based on the arranged middle water pool 7, wherein a water outlet pipe of the lifting pump is connected with the middle water pool 7, and the water quantity in the middle water pool 7 is supplemented by the lifting pump.
The foregoing is merely a preferred embodiment of the present invention, and it should be noted that modifications and substitutions can be made by those skilled in the art without departing from the technical principles of the present invention, and these modifications and substitutions should also be considered as being within the scope of the present invention.
Claims (10)
1. The utility model provides a conventional mixed flow power station changes into pumped storage power station suction height improvement system, pumped storage power station's water pump turbine unit (1) is the same with conventional mixed flow power station's turbine unit's mounted position, water pump turbine unit (1) set up outside low water reservoir (2) and the top height of water pump turbine unit (1) is less than the surface of water height of low water reservoir (2), and wherein the surface of water of low water reservoir (2) forms low water level (3), water pump turbine unit (1) are connected with high water reservoir (5) through first raceway (4) to be connected with low water reservoir (2) through second raceway (6), its characterized in that: the suction height improvement system comprises a hydraulic lifting device immersed in water in a downstream water reservoir (2) and a middle position water tank (7) arranged above the downstream water level (3), wherein the hydraulic lifting device is connected with the middle position water tank (7), water in the downstream water reservoir (2) is lifted to the middle position water tank (7) by utilizing the water level difference between an upstream water reservoir (5) and the downstream water reservoir (2), the middle position water tank (7) is connected with a second water pipe (6) through a connecting pipe (8), water in the middle position water tank (7) is pumped into an upstream water reservoir (5) by a water pump water turbine unit (1) under a water pump pumping working condition, and water in the middle position water tank (7) is used for lifting the burial depth of the water pump water turbine unit (1) so as to meet the suction height requirement of the water pump water turbine unit (1).
2. A conventional mixed flow power plant change-over pumped storage power plant suction height improvement system according to claim 1, characterized by: the hydraulic lifting device comprises a high-pressure injection pipe (9) and a mixing diffusion pipe (10), wherein the upstream end of the high-pressure injection pipe (9) is connected with an upstream water reservoir (5) and the downstream end of the high-pressure injection pipe is connected with a jet nozzle (11), the upstream end of the mixing diffusion pipe (10) is connected with one of the opening ends of a receiving chamber (12) and the downstream end of the mixing diffusion pipe is connected with a middle-position water pool (7), the jet end of the jet nozzle (11) extends into the receiving chamber (12) from the other opening end of the receiving chamber (12), and the hydraulic lifting device is used for mixing and exchanging energy between high-pressure water flow in the upstream water reservoir (5) and low-pressure water flow in a downstream water reservoir (2) in the receiving chamber (12) and the mixing diffusion pipe (10) and guiding formed middle-pressure mixed water flow into the middle-position water pool (7).
3. A conventional mixed flow power plant change-over pumped storage power plant suction height improvement system according to claim 2, characterized by: the hydraulic lifting device further comprises a flow gathering cover (13), and the receiving chamber (12), the downstream section of the high-pressure injection pipe (9) and the upstream section of the mixing diffusion pipe (10) are all positioned in the flow gathering cover (13).
4. A system for improving suction height of a conventional mixed-flow power station instead of a pumped-storage power station according to claim 3, characterized in that: the receiving chamber (12) is in a horn shape, the small-diameter opening end of the receiving chamber (12) is connected with the upstream end of the mixing diffusion pipe (10), and the injection end of the jet nozzle (11) extends into the receiving chamber (12) from the large-diameter opening end of the receiving chamber (12).
5. A system for improving suction height of a conventional mixed-flow power station instead of a pumped-storage power station according to claim 3, characterized in that: the mixing diffusion pipe (10) comprises a first mixing diffusion section (1001), a second mixing diffusion section (1002) and a third mixing diffusion section (1003) which are sequentially connected from upstream to downstream, the inner diameter of the first mixing diffusion section (1001) is smaller than the inner diameter of the third mixing diffusion section (1003), and the second mixing diffusion section (1002) is in a round table shape.
6. A conventional mixed flow power plant change-over pumped storage power plant suction height improvement system according to claim 5, characterized by: the axes of the jet nozzle (11), the receiving chamber (12), the first mixing diffusion section (1001), the second mixing diffusion section (1002) and the flow gathering cover (13) are coincident.
7. A system for improving suction height of a conventional mixed-flow power station instead of a pumped-storage power station according to claim 3, characterized in that: the upstream end of the connecting pipe (8) penetrates through the bottom wall of the middle water tank (7) and extends into the middle water tank (7), and the downstream end of the connecting pipe (8) is connected with the second water pipe (6); the downstream end of the mixing diffusion pipe (10) penetrates through the bottom wall of the middle water tank (7) and extends into the middle water tank (7).
8. A method for improving suction height of a conventional mixed-flow power station to a pumped storage power station, which is improved by adopting the suction height improving system of the conventional mixed-flow power station to the pumped storage power station according to any one of claims 3-7, and is characterized by comprising the following steps: the hydraulic lifting device lifts water in a downstream water reservoir (2) into a middle-position water tank (7), water in the middle-position water tank (7) lifts the burial depth of a water pump water turbine unit (1), the requirement of the water pump water turbine unit (1) on the suction height is met, the water pump water turbine unit (1) is guaranteed to normally operate under a water pump pumping working condition, and the water pump water turbine unit (1) sequentially pumps water in the middle-position water tank (7) into an upstream water reservoir (5) through a connecting pipe (8), a second water pipe (6) and a first water pipe (4) under the water pump pumping working condition.
9. The suction height improvement method for a conventional mixed flow power station to a pumped-storage power station according to claim 8, wherein the hydraulic lifting device lifts water in a downstream water reservoir (2) into a neutral water tank (7), specifically: the high-pressure water in the upstream water reservoir (5) flows through the high-pressure injection pipe (9) for drainage, low-pressure water flow which is formed at the jet nozzle (11) and is sucked into the downstream water reservoir (2) is formed, the high-pressure water flow in the upstream water reservoir (5) and the low-pressure water flow in the downstream water reservoir (2) are mixed in the receiving chamber (12) and the mixing diffusion pipe (10) for energy exchange, and the formed medium-pressure mixed water flow is led into the middle-position water pool (7) through the mixing diffusion pipe (10).
10. The suction height improvement method for a conventional mixed flow power station to pumped storage power station according to claim 9, wherein the hydraulic lifting device lifts water in the downstream water reservoir (2) into the neutral water reservoir (7), specifically: the high-pressure water in the upstream water reservoir (5) flows through the high-pressure injection pipe (9) for drainage, the low-pressure water flow which is formed at the jet nozzle (11) and is sucked in the downstream water reservoir (2) is formed, a good sucking effect is formed under the rectifying and guiding effects of the flow collecting cover (13), the high-pressure water flow in the upstream water reservoir (5) and the low-pressure water flow in the downstream water reservoir (2) are mixed in the receiving chamber (12) and the mixing diffusion pipe (10) for energy exchange, and the formed medium-pressure mixed water flow is led into the middle-position water reservoir (7) through the mixing diffusion pipe (10).
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| Application Number | Priority Date | Filing Date | Title |
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| CN202410259996.1A CN118008666B (en) | 2024-03-07 | System and method for improving suction height of pumped storage power station by changing conventional mixed-flow power station into pumped storage power station |
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| CN202410259996.1A CN118008666B (en) | 2024-03-07 | System and method for improving suction height of pumped storage power station by changing conventional mixed-flow power station into pumped storage power station |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107341320A (en) * | 2017-07-25 | 2017-11-10 | 中国水利水电科学研究院 | A kind of down stream surge-chamber of hydroenergy storage station sets method of discrimination |
| CN111809582A (en) * | 2020-08-17 | 2020-10-23 | 华北水利水电大学 | Pumped storage power station constructed by utilizing conventional hydropower station resources |
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107341320A (en) * | 2017-07-25 | 2017-11-10 | 中国水利水电科学研究院 | A kind of down stream surge-chamber of hydroenergy storage station sets method of discrimination |
| CN111809582A (en) * | 2020-08-17 | 2020-10-23 | 华北水利水电大学 | Pumped storage power station constructed by utilizing conventional hydropower station resources |
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