阅读说明：本技术 长尾水系统检修排水系统及方法 (Long tail water system maintenance drainage system and method ) 是由 何峰 胡定辉 柳飞 王豪 章勋 陈笙 彭志远 于 2021-08-02 设计创作，主要内容包括：本发明涉及一种长尾水系统检修排水系统及方法,该检修排水系统,包括直接排水部分和间接排水部分,直接排水部分进水口通过管道经阀门V01和阀门V03与尾水管连通,出水口一路通过管道经阀门V05与集水井连通,另一路通过管道与竖井连通；间接排水部分进水口通过管道经阀门V02、阀门V04和压力变送器PT与尾水隧洞连通,出水口通过管道与竖井连通。采用直接排水和间接排水相结合的方式,将机组尾水管和尾水隧洞内的积水和隧洞、闸门的渗漏水及时排出,本发明兼顾了直接排水和间接排水方案的优势,无需开挖大规模的检修集水井,无需采取额外的防水淹厂房措施,减少了土建的开挖工程量,降低了土建的施工难度。(The invention relates to a long tail water system overhauls drainage system and method, should overhaul the drainage system, including direct drainage part and indirect drainage part, the water inlet of the direct drainage part is communicated with draft tube through the pipeline by valve V01 and valve V03, one route of water outlet is communicated with sump pit through the pipeline by valve V05, another route is communicated with vertical shaft through the pipeline; the water inlet of the indirect drainage part is communicated with the tail water tunnel through a valve V02, a valve V04 and a pressure transmitter PT through pipelines, and the water outlet is communicated with the vertical shaft through a pipeline. The invention adopts a mode of combining direct drainage and indirect drainage to drain accumulated water in a unit draft tube and a draft tunnel and leakage water of the tunnel and a gate in time, takes advantages of a direct drainage scheme and an indirect drainage scheme into consideration, does not need to dig a large-scale maintenance water collecting well, does not need to take extra water flooding-proof workshop measures, reduces the excavation engineering quantity of civil engineering and reduces the construction difficulty of the civil engineering.)

1. The utility model provides a long tail water system overhauls drainage system which characterized in that: the water inlet of the direct drainage part is communicated with a tail water pipe through a valve V01 and a valve V03 by pipelines, one path of the water outlet is communicated with a water collecting well through a valve V05 by a pipeline, and the other path of the water outlet is communicated with a vertical well by a pipeline; the water inlet of the indirect drainage part is communicated with the tail water tunnel through a valve V02, a valve V04 and a pressure transmitter PT through pipelines, and the water outlet is communicated with the vertical shaft through a pipeline.

2. The long tail water system service drainage system of claim 1, wherein: the direct water discharge part comprises a plurality of pipeline pumps which are arranged in parallel.

3. The long tail water system service drainage system of claim 2, wherein: the pipeline pump is manually controlled to be started, and the pipeline pump is automatically controlled to be stopped by adopting the water level.

4. The long tail water system service drainage system of claim 1, wherein: the indirect drainage part comprises a water collecting well and a plurality of submersible pumps which are arranged in parallel.

5. The long tail water system service drainage system of claim 4, wherein: the submersible pump is started and stopped by adopting automatic water level control.

6. A long tail water system overhaul drainage system according to any one of claims 1 to 5, wherein: the valve V01 and the valve V05 are manual valves, and the valve V02, the valve V03 and the valve V04 adopt electric valves.

7. A long tail water system maintenance drainage method is characterized in that: adopt the drainage mode that direct drainage and indirect drainage combined together, direct drainage mode: a drainage pump room is arranged at the bottom of a tail water tunnel of the tail water surge chamber, and accumulated water in the tail water system is drained through a pipeline system and a pipeline pump; the direct drainage mode: and a water collecting well is arranged in the pump room, and leakage water generated by a tail water tunnel rock layer and a gate when the tail water system is overhauled and leakage water of rock layers around the pump room are collected and discharged through a pipeline system and a submersible pump.

8. The long tail water system service drainage method of claim 7, wherein: accumulated water in the tail water pipe and the tail water tunnel is respectively drained, a valve V01 and a valve V02 are respectively opened, then a valve V03 and a pipeline pump are opened, the valve V04 and the valve V05 are kept in a closed state, and the accumulated water is drained to a tail water surge chamber of a downstream river channel or an adjacent unit; when the pressure transmitter PT monitors that the water level is reduced to the lowest operation water level requirement of the pipeline pump, the pipeline pump is automatically shut down, the valve V04 is opened, the valve V05 is manually opened, the residual accumulated water and the leakage water flow into the water collecting well, the water level reaches the operation water level of the submersible pump, the submersible pump is started to discharge to a downstream river channel or a tail water surge chamber of an adjacent unit, and when the water level is reduced to the stop water level of the submersible pump, the submersible pump is shut down.

Technical Field

The invention relates to the technical field of hydraulic and hydroelectric engineering, in particular to a long tail water system maintenance drainage system and a long tail water system maintenance drainage method.

Background

For the hydropower station with the long tail water system, after the initial water filling test of the hydropower station or after running for many years, the accumulated water in the draft tube and the draft tunnel needs to be drained when the hydraulic turbine unit is maintained and the draft tunnel needs to be checked, and meanwhile, the channel is prevented from being submerged by the leakage water of the tunnel and the gate, so that workers can conveniently enter the channel to overhaul and maintain.

The current tail water system drainage scheme has two types: (1) indirect drainage mode: a disc valve is arranged at the low point of the tail water system, the water body in the tail water system is discharged into an inspection water collecting well through a drainage gallery, and then the water is discharged into a river channel through a water pump; (2) the direct drainage mode: and directly connecting the water body in the tail water system into a water pump by using a pipeline for pumping and draining.

The two schemes are feasible for hydropower stations with short tail water systems and are applied to practical engineering cases, but the two schemes have defects for hydropower stations with long tail water systems. The long tail water system's tail water tunnel internal ponding volume is huge, need select large-traffic drain pump, and is equipped with tail water surge-chamber usually, divide into tail water pipe and tail water tunnel two parts with tail water system, and one set of drainage system is for giving consideration to the independent drainage maintenance work of two parts, and drainage system need arrange near tail water surge-chamber. If only an indirect drainage mode is adopted, not only a plurality of large-flow drainage pumps need to be arranged, but also a large-size overhaul water collecting well needs to be additionally excavated, so that the civil engineering quantity is large; on the other hand, the elevation of the wellhead of the water collecting well is lower than the downstream water level of the power station, and a water flooding prevention measure is adopted for the water collecting well; if only adopt direct drainage mode, need adopt large-traffic drain pump drainage ponding, during the maintenance of runner, in order to get rid of the percolating water of runner, the evacuation problem that frequently opens and stops drain pump and drainage pipe system appears easily, damages the drain pump easily and causes the interior electric system load of factory unstable.

Disclosure of Invention

In order to solve the problems, the invention provides a long tail water system maintenance drainage system and a long tail water system maintenance drainage method.

The technical scheme adopted by the invention is as follows: the utility model provides a long tail water system overhauls drainage system which characterized in that: the water inlet of the direct drainage part is communicated with a tail water pipe through a valve V01 and a valve V03 by pipelines, one path of the water outlet is communicated with a water collecting well through a valve V05 by a pipeline, and the other path of the water outlet is communicated with a vertical well by a pipeline; the water inlet of the indirect drainage part is communicated with the tail water tunnel through a valve V02, a valve V04 and a pressure transmitter PT through pipelines, and the water outlet is communicated with the vertical shaft through a pipeline.

Preferably, the direct drain section includes a plurality of pipe pumps arranged in parallel.

Preferably, the pipeline pump is manually controlled to be started, and is automatically controlled to be stopped by adopting the water level.

Preferably, the indirect drainage part comprises a water collecting well and a plurality of submersible pumps arranged in parallel.

Furthermore, the submersible pump is started and stopped by adopting automatic water level control.

Furthermore, the valve V01 and the valve V05 are manual valves, and the valve V02, the valve V03 and the valve V04 are electric valves.

A long tail water system maintenance drainage method is characterized in that: adopt the drainage mode that direct drainage and indirect drainage combined together, direct drainage mode: a drainage pump room is arranged at the bottom of a tail water tunnel of the tail water surge chamber, and accumulated water in the tail water system is drained through a pipeline system and a pipeline pump; the direct drainage mode: and a water collecting well is arranged in the pump room, and leakage water generated by a tail water tunnel rock layer and a gate when the tail water system is overhauled and leakage water of rock layers around the pump room are collected and discharged through a pipeline system and a submersible pump.

Preferably, accumulated water in the tail water pipe and the tail water tunnel is respectively drained, a valve V01 and a valve V02 are respectively opened, a valve V03 and a pipeline pump are then opened, the valve V04 and the valve V05 are kept in a closed state, and the accumulated water is drained to a downstream river channel or a tail water surge chamber of an adjacent unit; when the pressure transmitter PT monitors that the water level is reduced to the lowest operation water level requirement of the pipeline pump, the pipeline pump is automatically shut down, the valve V04 is opened, the valve V05 is manually opened, the residual accumulated water and the leakage water flow into the water collecting well, the water level reaches the operation water level of the submersible pump, the submersible pump is started to discharge to a downstream river channel or a tail water surge chamber of an adjacent unit, and when the water level is reduced to the stop water level of the submersible pump, the submersible pump is shut down.

The beneficial effects obtained by the invention are as follows: the mode of combining direct drainage and indirect drainage is adopted, accumulated water in a unit draft tube and a draft tunnel and leakage water of the tunnel and a gate are discharged in time. The invention takes the advantages of the direct drainage scheme and the indirect drainage scheme into consideration, does not need to excavate a large-scale overhaul water collecting well, does not need to take extra water flooding-proof workshop measures, reduces the excavation engineering quantity of civil engineering and reduces the construction difficulty of the civil engineering; meanwhile, the condition that a large-flow water pump is frequently started and stopped is avoided, the drainage equipment is protected, and frequent and large-amplitude fluctuation of the service load of the power station is avoided.

Drawings

FIG. 1 is a view of the service drain line of the present invention;

reference numerals: 1. a tail water surge chamber; 2. a tailwater tunnel; 3. a draft tube; 4. a direct water discharge section; 5. an indirect water discharge section; 6. a water collecting well; 7. and (4) a shaft.

Detailed Description

The invention will be further described with reference to the following drawings and specific embodiments.

As shown in fig. 1, the long tail water system overhaul drainage system of the invention comprises a direct drainage part 4 and an indirect drainage part 5, wherein the direct drainage part 4 is that a tail water pipe 3 at the bottom of a tail water tunnel 2 of a tail water surge chamber 1 is provided with a direct drainage pump room, accumulated water in the tail water system is drained through a pipeline system and a large-flow water pump (in the embodiment, a pipeline pump is adopted), a water inlet of the direct drainage pump room is communicated with the tail water pipe through a valve V01 and a valve V03 through a pipeline, one path of a water outlet is communicated with a water collecting well 6 through a valve V05 through a pipeline, and the other path is communicated with a vertical shaft 7 through a pipeline; the indirect drainage part 5 is that an indirect drainage pump room is arranged at the bottom of the tail water tunnel 2 of the tail water surge chamber 1, a small-sized leakage water collecting well 7 is arranged in the indirect drainage pump room, and leakage water generated by a tail water tunnel rock stratum and a gate when a tail water system is overhauled and leakage water of rock strata around the pump room are collected and drained away through a pipeline system and a small-flow water pump (a submersible pump is adopted in the embodiment).

In the embodiment, a plurality of pipeline pumps arranged in parallel are arranged in the direct drainage pump room, the plurality of pipeline pumps are manually controlled to be started, and the pipeline pumps are automatically controlled to be stopped; the direct drainage pump room is internally provided with a water collecting well 6 and a plurality of submersible pumps which are arranged in parallel, and the submersible pumps are automatically controlled by water level when being started and stopped. The high-flow pipeline pump can be prevented from being started and stopped frequently, the high-flow pipeline pump motor is effectively protected, and the frequent and large-amplitude fluctuation of the service load of the power station is avoided.

In this embodiment, the valve V01 and the valve V05 are manual valves, and the valve V02, the valve V03 and the valve V04 are electric valves.

Taking an underground hydropower station of a long tail water system as an example, the drainage pump house is arranged near the lower part of the tail water pressure regulating well, and the tail water tunnel is about 5.5km long. The volume of the accumulated water of the tail water system is 1.19 multiplied by 106m3, if the tail water system is emptied in 7 days, the direct water discharging part adopts 4 pipeline pumps with 500L/s flow, and the power of a single pipeline pump is about 460kW in consideration of the requirement of the lift. The leakage water of the tunnel, the pump room and the gate is 20L/s in total, 3 submersible pumps with the water discharge of 40L/s are adopted in the indirect water discharge part, 2 working submersible pumps are reserved for 1, and the power of each submersible pump is about 60kW in consideration of the requirement of the lift.

The invention relates to a long tail water system maintenance drainage method, which adopts a drainage mode combining direct drainage and indirect drainage, wherein the direct drainage mode comprises the following steps: a drainage pump room is arranged at the bottom of a tail water tunnel 2 of the tail water surge chamber 1, and accumulated water in the tail water system is drained through a pipeline system and a pipeline pump; the direct drainage mode: and a water collecting well is arranged in the pump room, and leakage water generated by a tail water tunnel rock layer and a gate when the tail water system is overhauled and leakage water of rock layers around the pump room are collected and discharged through a pipeline system and a submersible pump.

The maintenance drainage of the tail water system of the power station is divided into 3 working conditions: and the tail water pipe overhauls and drains water, the tail water tunnel overhauls and drains water and the two overhauls and drains water simultaneously. Accumulated water in the tail water pipe 3 and the tail water tunnel 2 is respectively drained, a valve V01 and an electric valve V02 are respectively opened, then the electric valve V03 and a pipeline pump are opened, the electric valve V04 and the valve V05 are kept in a closed state, and the accumulated water is drained to a tail water surge chamber of a downstream river channel or an adjacent unit; when the pressure transmitter PT monitors that the water level is reduced to the lowest operation water level requirement of the pipeline pump, the pipeline pump is automatically shut down, the electric valve V04 is opened, the valve V05 can be manually opened according to requirements, the residual accumulated water and leakage water flow into the water collecting well 6 to reach the operation water level of the submersible pump, the submersible pump is started to be discharged to a downstream river channel or a tail water surge chamber of an adjacent unit, and when the water level is reduced to the pump stop water level of the submersible pump, the submersible pump is shut down.

The foregoing shows and describes the general principles and principal structural features of the present invention. The present invention is not limited to the above examples, and various changes and modifications may be made without departing from the spirit and scope of the invention, which fall within the scope of the claimed invention. The scope of the invention is defined by the appended claims and equivalents thereof.