Arrangement structure for accelerating stability of super-long water delivery power generation system

Abstract

The utility model relates to an arrangement structure for accelerating the stability of a super-long water delivery power generation system, which comprises a water delivery tunnel, a surge chamber and an impedance hole, and the length direction of the water delivery tunnel extends along a preset direction; the number of the surge chambers is multiple, the multiple surge chambers are arranged at intervals in the length direction of the water conveying tunnel, the bottoms of the surge chambers communicate with the water conveying tunnel through communicating channels, and at least part of the surge chambers are reconstructed from the construction adit; the impedance hole is arranged in the communication channel. According to the arrangement structure for accelerating the stability of the super-long water delivery power generation system, a super-long water delivery power generation system unit has the same unit operation flexibility as a short water delivery power generation system, and meanwhile, the safety of the whole water delivery power generation system is greatly improved.

Description

Technical Field

[0001] This application relates to the technical field of hydropower engineering, and particularly relates to an arrangement structure for accelerating the stability of an ultra-long water conveyance power generation system. Background Art

[0002] At present, the construction of hydropower projects in China is gradually entering a new stage of high-quality development, and there are more and more ultra-long water diversion power generation systems. Ultra-long water diversion power stations usually need to set up one or more surge chambers (functionally equivalent to one) near the unit. The purpose is to fully reflect the water hammer and divide the water hammer wave to reduce the maximum water hammer pressure value. As a result, the gravity fluctuation formed between the water inlet and the surge chamber is extremely large, causing the surge chamber to have very high water level fluctuations and a very long time for the water level fluctuations to stabilize. For example, in a 16-km-long diversion power station in the western region, the fluctuation period is up to 10 minutes, and it takes up to 2 hours for the water level fluctuation in the surge chamber to stabilize to a level with less impact on the unit output. Thus, it can be seen that how to ensure the rapid stability of the power station water diversion system has become a technical problem to be solved in long diversion power stations. Utility Model Content

[0003] The embodiment of this application provides an arrangement structure for accelerating the stability of an ultra-long water conveyance power generation system. This arrangement structure for accelerating the stability of an ultra-long water conveyance power generation system can enable the units of the ultra-long water conveyance power generation system to have the same operating flexibility as those of a short water conveyance power generation system, and at the same time greatly improve the safety of the entire water conveyance power generation system.

[0004] The arrangement structure for accelerating the stability of an ultra-long water conveyance power generation system provided by the embodiment of this application includes: a water conveyance tunnel, and the length direction of the water conveyance tunnel extends along a preset direction;

[0005] Surge chambers, the number of the surge chambers is multiple, the multiple surge chambers are arranged at intervals along the length direction of the water conveyance tunnel, the bottom of the surge chamber is communicated with the water conveyance tunnel through a communication channel, and at least part of the surge chambers are rebuilt from construction access tunnels;

[0006] Resistance orifices, which are arranged in the communication channel.

[0007] In addition, the arrangement structure for accelerating the stability of an ultra-long water conveyance power generation system provided by the embodiment of this application may also have the following additional technical features:

[0008] In an alternative solution, the distance between two adjacent surge chambers is approximately equal; the surge chamber includes a rebuilt surge chamber and a newly built impedance surge chamber, and the rebuilt surge chamber is rebuilt from the construction access tunnel.

[0009] In an alternative solution, the water level fluctuation periods of the reconstructed surge chamber and the newly built impedance surge chamber are avoided, and the ratio of the fluctuation periods is less than 90% or greater than 110%; the cross-sectional plane of the construction adit is the stable cross-sectional area of the reconstructed surge chamber.

[0010] In an alternative solution, define the area of the surge chamber as S1 and the flow cross-sectional area of the impedance orifice as S2, then: 1 / 4 ≤ S2 / S1 ≤ 7 / 20.

[0011] The beneficial effects of the embodiments of the present application are as follows:

[0012] This layout structure makes full use of the construction adits arranged to shorten the construction time during the construction of the power station water conveyance tunnel. Some construction adits that should be blocked after the completion of some projects are reconstructed into surge chambers that can accelerate the attenuation speed of the water hammer pressure fluctuation and the gravity fluctuation in the whole system, and the adits excavated during the construction stage are efficiently utilized, thus achieving the effects of cost saving, convenient maintenance and convenient construction. At the same time, by properly determining the cross-sectional areas of the surge chamber reconstructed from the construction adit and the newly built impedance surge chamber, the water level fluctuation periods between the two are avoided, and the possible water level oscillation phenomenon is avoided, effectively solving the problems of the ultra-long period caused by the water level fluctuation of the surge chamber of the ultra-long tunnel and the slow attenuation speed of the water hammer pressure fluctuation and the gravity fluctuation in the system, accelerating the stability of the whole water conveyance and power generation system, so that the units of the ultra-long water conveyance and power generation system have the same unit operation flexibility as the short water conveyance and power generation system, and at the same time greatly improving the safety of the whole system.

[0013] It should be understood that the above general description and the following detailed description are only exemplary and do not limit the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a layout schematic diagram of the layout structure for accelerating the stability of the ultra-long water conveyance and power generation system provided by the present application.

[0015] Reference numerals: water conveyance tunnel 1, surge chamber 2, newly built impedance surge chamber 3, impedance orifice 4.

[0016] The accompanying drawings herein are incorporated into the specification and form a part of the specification, showing embodiments consistent with the present application, and are used together with the specification to explain the principles of the present application. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0017] In order to better understand the technical solutions of the present application, the embodiments of the present application will be described in detail below with reference to the accompanying drawings.

[0018] It should be clear that the described embodiments are only a part of the embodiments of this application, rather than all embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of this application.

[0019] The terms used in the embodiments of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The singular forms "a", "the" and "said" used in the embodiments of this application and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise.

[0020] It should be understood that the term "and / or" used herein is only a description of the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B may represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " herein generally represents an "or" relationship between the associated objects before and after.

[0021] It should be noted that the orientation terms such as "upper", "lower", "left", and "right" described in the embodiments of this application are described from the angles shown in the drawings and should not be construed as a limitation of the embodiments of this application. In addition, in the context, it should also be understood that when it is mentioned that a component is connected "above" or "below" another component, it can not only be directly connected "above" or "below" another component, but also be indirectly connected "above" or "below" another component through an intermediate component.

[0022] As Figure 1 shown, the embodiments of this application provide an arrangement structure for accelerating the stability of an ultra-long water conveyance and power generation system. This arrangement structure for accelerating the stability of the ultra-long water conveyance and power generation system can reduce the ultra-long period problem caused by the water level fluctuation in the surge chamber of the ultra-long tunnel and accelerate the attenuation speed of the water hammer pressure fluctuation and gravity fluctuation in the whole system, thereby accelerating the stability of the whole water conveyance and power generation system. Specifically, this arrangement structure mainly includes a water conveyance tunnel 1, a surge chamber 2, and an impedance orifice 4. Among them, the length direction of the water conveyance tunnel 1 extends along a preset direction; the number of surge chambers 2 is multiple, and the multiple surge chambers 2 are arranged at intervals along the length direction of the water conveyance tunnel 1. The bottom of the surge chamber 2 is connected to the water conveyance tunnel 1 through a communication channel, and at least part of the surge chambers 2 are reconstructed from construction access tunnels; the impedance orifice 4 is arranged in the communication channel.

[0023] This layout structure makes full use of the construction access tunnels arranged during the construction of the power station water conveyance tunnel 1 to shorten the construction time. Some of the construction access tunnels that should have been blocked after the completion of the project are rebuilt into surge chambers 2 that can accelerate the attenuation rate of water hammer pressure fluctuations and gravity fluctuations in the entire system, efficiently utilizing the access tunnels excavated during the construction stage, thus achieving the effects of cost savings, convenient maintenance, and easy construction. At the same time, by properly determining the cross-sectional areas of the surge chamber 2 rebuilt from the construction access tunnel and the newly built impedance surge chamber 3, the water level fluctuation periods between the two are avoided, preventing the possible occurrence of water level oscillations, effectively solving the problems of the ultra-long period caused by the water level fluctuations in the surge chamber 2 of the ultra-long tunnel and the slow attenuation rate of water hammer pressure fluctuations and gravity fluctuations in the system, accelerating the stability of the entire water conveyance and power generation system, so that the units of the ultra-long water conveyance and power generation system have the same operating flexibility as those of the short water conveyance and power generation system, while significantly enhancing the safety of the entire system.

[0024] As Figure 1 shown, in a specific embodiment, the distances between adjacent surge chambers 2 are approximately equal; the surge chamber 2 includes a rebuilt surge chamber 2 and a newly built impedance surge chamber 3, and the rebuilt surge chamber 2 is rebuilt from the construction access tunnel.

[0025] During the construction of the water diversion system, to meet the construction technical requirements and improve the construction efficiency, it is usually necessary to arrange multiple construction access tunnels along the water conveyance tunnel 1, and then block the construction access tunnels after the completion of the water diversion system construction task. In this embodiment, several construction access tunnels are selected as the basis to be rebuilt into surge chambers 2, and newly built impedance surge chambers 3 are arranged in the parts where it is not possible to arrange construction access tunnels; it is required that the positions of the surge chambers 2 rebuilt from the construction access tunnels and the newly built impedance surge chambers 3 are basically located at the equal division points of the tunnel length. At the same time, the connection between the water conveyance tunnel 1 and the construction access tunnel is transformed into an impedance orifice 4.

[0026] As Figure 1 shown, in a specific embodiment, the water level fluctuation periods of the rebuilt surge chamber 2 and the newly built impedance surge chamber 3 are avoided, and the ratio of the fluctuation periods is less than 90% or greater than 110%, that is, the ratio of the fluctuation periods is outside 90% - 110%. While accelerating the overall attenuation, the occurrence of water level oscillations is avoided. In addition, if the area of the surge chamber 2 is defined as S1 and the flow cross-sectional area of the impedance orifice 4 is defined as S2, then: 1 / 4 ≤ S2 / S1 ≤ 7 / 20, that is, the area of the impedance orifice 4 is determined according to 25% - 35% of the area of the impedance surge chamber 2, so as to play the role of reducing the amplitude of water level fluctuations, accelerating the pressure attenuation, and reducing the reconstruction construction workload.

[0027] When arranging the construction access adit, it is necessary to overall consider the elevation of its inlet according to the highest surge water level of the surge chamber 2 to ensure no overflow occurs during the highest surge. The cross-sectional area of the horizontal section of the construction access adit is used as the cross-sectional area for calculating the stable section of the surge chamber 2. The determination of the specific cross-sectional value needs to analyze the water level fluctuation and surge range in combination with the calculation results of the transient process, on the premise of meeting the requirement of no resonance.

[0028] The above are only the preferred embodiments of the present application and are not used to limit the present application. For those skilled in the art, various changes and modifications can be made to the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. An arrangement structure for accelerating the stability of an ultra-long water conveyance and power generation system, characterized in that Including: A water conveyance tunnel, the length direction of the water conveyance tunnel extends along a preset direction; Surge chambers, the number of the surge chambers is multiple, the multiple surge chambers are arranged at intervals along the length direction of the water conveyance tunnel, the bottom of the surge chamber is communicated with the water conveyance tunnel through a connecting channel, and at least part of the surge chambers are rebuilt from construction access tunnels; Resistance holes, the resistance holes are arranged in the connecting channel.

2. The layout structure for stabilizing the accelerated ultra-long water conveyance power generation system according to claim 1, wherein The distance between two adjacent surge chambers is substantially equal; the surge chamber includes a rebuilt surge chamber and a newly built impedance surge chamber, and the rebuilt surge chamber is rebuilt from the construction access tunnel.

3. The layout structure for stabilizing the acceleration of the ultra-long water conveyance power generation system according to claim 2, wherein, Avoid the water level fluctuation periods of the rebuilt surge chamber and the newly built impedance surge chamber, and the ratio of the fluctuation periods is less than 90% or greater than 110%; the cross-sectional area of the construction access tunnel in the horizontal section is the stable cross-sectional area of the rebuilt surge chamber.

4. The layout structure for stabilizing the accelerated ultra-long water conveyance power generation system according to any one of claims 1-3, characterized in that, Define the area of the surge chamber as S1 and the flow cross-sectional area of the resistance hole as S2, then: 1 / 4 ≤ S2 / S1 ≤ 7 / 20.

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