One-key quick tail water discharge system and method for pumped storage power station
阅读说明：本技术 一种用于抽水蓄能电站一键快速排尾水系统及方法 (One-key quick tail water discharge system and method for pumped storage power station ) 是由 陈鹏 张晓倩 张子龙 李丰羽 董兴顺 李承龙 刘宏源 任青旭 刘世忠 朱光宇 于 2019-11-14 设计创作，主要内容包括：本发明属于抽水蓄能电站技术领域,尤其涉及一种用于抽水蓄能电站一键快速排尾水系统及方法。本发明系统是由压缩空气系统通过管路与机组的尾水管相连接,所述管路上设置有充气阀门。本发明抽水蓄能机组采用快速排尾水方式,一是大大缩短了排水时间,为机组检修、设备消缺提供了充足时间,有效的提高了设备可利用时间,使抽水蓄能机组充分的服务电网。二是利用压缩空气排水,节约了排水泵消耗的大量电能,特别是在设备检修期间,一般需要气罐同步排压。利用需要排除的压缩空气排水,有一举两得的作用。三是利用自动流程一键操作,提高了可靠性,降低了操作的风险。本发明很大程度上提高了抽水蓄能电站的效率、效益,使抽水蓄能电站更好的服务电网。(The invention belongs to the technical field of pumped storage power stations, and particularly relates to a one-key quick tail water discharge system and a method for a pumped storage power station. The system is characterized in that a compressed air system is connected with a tail water pipe of the unit through a pipeline, and an inflation valve is arranged on the pipeline. The pumped storage unit adopts a rapid tail water drainage mode, so that firstly, the drainage time is greatly shortened, sufficient time is provided for unit maintenance and equipment defect elimination, the available time of the equipment is effectively improved, and the pumped storage unit can fully serve a power grid. And secondly, the compressed air is used for draining water, so that a large amount of electric energy consumed by the drainage pump is saved, and especially during equipment maintenance, synchronous pressure drainage of the air tank is generally required. The compressed air which needs to be discharged is used for draining water, so that the effect of killing two birds with one stone is achieved. Thirdly, one-key operation is performed by utilizing an automatic process, so that the reliability is improved, and the operation risk is reduced. The invention improves the efficiency and the benefit of the pumped storage power station to a great extent, and enables the pumped storage power station to better serve a power grid.)
1. The utility model provides a be used for quick tail water system of arranging of pumped storage power station key which characterized by: the compressed air system is connected with a tail water pipe of the unit through a pipeline, and an inflation valve is arranged on the pipeline.
2. The one-key rapid tail water discharge system for the pumped storage power station as claimed in claim 1, wherein: the inflation valve is an inflation water pressurizing first valve or an inflation water pressurizing second valve.
3. A method for one-key rapid tail water drainage of a pumped storage power station is characterized by comprising the following steps: the method comprises the following steps:
step 1: the compressed air system is connected with a tail water pipe of the unit through a pipeline, and an inflation valve is arranged on the pipeline and used for controlling whether to open inflation. And when the unit is in a shutdown state, the first inflation pressurized water valve or the second inflation pressurized water valve is opened, compressed gas is conveyed to a unit tail water pipe, the compressed air extrudes unit tail water into a lower reservoir in the tail water pipe through gas expansion force, and a part of hollow positions are formed in a unit section.
Step 2: and (4) dropping the unit tail water accident gate, cutting off water flow, and calling an exhaust flow to remove expanded compressed air.
4. The method of claim 3 for one-touch rapid tailwater drainage for pumped storage power stations, wherein: the inflation time of the inflation quantity of the compressed gas is 12-20 s.
5. The method of claim 3 for one-touch rapid tailwater drainage for pumped storage power stations, wherein: the compressed gas exhaust time is 30s or more.
6. The method of claim 3 for one-touch rapid tailwater drainage for pumped storage power stations, wherein: under the unit shutdown state, open and aerify No. one valve of pressurized water or aerify No. two valves of pressurized water, carry compressed gas to unit draft tube, compressed air extrudes unit draft tube into lower reservoir through the gas expansion power in the draft tube, forms partial cavity position at the unit section, specifically indicates:
firstly, putting a speed regulator to provide a power source for valve operation;
then a mechanical braking device is put into the water drainage device to prevent the unit from creeping in the water drainage process;
and finally, closing the exhaust valve and opening the inflation valve to enable high-pressure gas to be filled into the unit tail water pipe, extruding the unit tail water out of the unit section, and delaying for 120 seconds to enable water flow to be stable.
7. The method of claim 3 for one-touch rapid tailwater drainage for pumped storage power stations, wherein: the unit tail water accident gate falls down, cuts off rivers, and the compressed air after the inflation is got rid of to the call flow of exhausting, indicates:
terminating the water pressing flow, opening a drain valve and discharging the residual compressed air in the unit section;
and (4) delaying for 120s to close the exhaust valve, resetting the mechanical brake, stopping the speed regulator, judging that the tail water pressure of the unit is reduced to 0, and ending the one-key drainage process.
Technical Field
The invention belongs to the technical field of pumped storage power stations, and particularly relates to a one-key quick tail water discharge system and a method for a pumped storage power station.
Background
The pumped storage power station is provided with a main water inlet valve and a tail water gate, and the frequency of a power grid is adjusted by the pumped storage power station and the power generation working condition. A main water inlet valve is arranged between machine set runners and mainly plays a role in cutting off upstream water flow, and a tail water accident gate is arranged and mainly plays a role in cutting off downstream water flow. Sometimes, the water between the main water inlet valve and the tail water accident gate needs to be emptied, so that conditions are created for the work of entering a flow channel to inspect a flow passing part, welding (corrosion prevention and flaw detection) the flow passing part, inspecting the water leakage of the gate, inspecting the downstream sealed water leakage of the main water inlet valve and the like.
The traditional drainage mode is shown in fig. 1, wherein a main
When in drainage, firstly, the tail water gate is dropped down to cut off water flow, and the tail water is drained to a lower reservoir through a drain pipe below the tail water gate by a maintenance drain pump. The method comprises the following specific steps:
firstly, the method for discharging tail water originally adopted by the pumped storage power station is introduced, and comprises the following steps:
step 1: firstly, the unit tail water accident gate falls down, so that a closed water area space is formed from the main water inlet valve to the tail water accident gate.
Step 2: and opening the drain valve and the exhaust valve. And starting the maintenance drainage pump, and pumping the water body from the main water inlet valve to the tail water accident gate to the rear side of the tail gate by the maintenance drainage pump acting. The air is naturally supplied through the exhaust valve, so that the vacuum is prevented from being formed.
At present, the tail water drainage of a pumped storage power station adopts a maintenance drainage pump drainage mode, namely, a maintenance drainage pipe is arranged at a lower position between a main water inlet valve and a tail water accident gate, the outlet of the drainage pipe is isolated by a drainage valve, and a plurality of maintenance drainage pumps are generally arranged behind the valve. And when the tail water needs to be drained, the drain valve is opened, and the unit tail water is drained to a lower reservoir or a surge shaft with higher elevation through the suction of the maintenance drain pump. The drainage mode generally needs 4-10 hours according to different quantities of tail water in the runners of the pumped storage power stations, and the electricity consumption of 1600-4000 kwh is consumed in each drainage. On one hand, the overhaul outage time of the unit is influenced, on the other hand, a large amount of electric energy resources are consumed, the operation is complicated, and the safety and stability of equipment are influenced. Because the drainage takes a long time, the working efficiency cannot be further improved, and certain operation risk also exists in the drainage process.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a one-key rapid tail water drainage method for a pumped storage power station, and aims to provide a rapid tail water drainage method which can rapidly drain water in an energy-saving manner, effectively improve the working efficiency and reduce the working risk.
In order to achieve the above object, the present invention is achieved by the following technical solutions:
a one-key quick tail water discharge system for a pumped storage power station is characterized in that a compressed air system is connected with a tail water pipe of a unit through a pipeline, and an inflation valve is arranged on the pipeline.
The inflation valve is an inflation water pressurizing first valve or an inflation water pressurizing second valve.
A method for one-key quick tail water drainage of a pumped storage power station comprises the following steps:
step 1: the compressed air system is connected with a tail water pipe of the unit through a pipeline, and an inflation valve is arranged on the pipeline and used for controlling whether to open inflation. And when the unit is in a shutdown state, the first inflation pressurized water valve or the second inflation pressurized water valve is opened, compressed gas is conveyed to a unit tail water pipe, the compressed air extrudes unit tail water into a lower reservoir in the tail water pipe through gas expansion force, and a part of hollow positions are formed in a unit section.
Step 2: and (4) dropping the unit tail water accident gate, cutting off water flow, and calling an exhaust flow to remove expanded compressed air.
The inflation time of the inflation quantity of the compressed gas is 12-20 s.
The compressed gas exhaust time is 30s or more.
Under the unit shutdown state, open and aerify No. one valve of pressurized water or aerify No. two valves of pressurized water, carry compressed gas to unit draft tube, compressed air extrudes unit draft tube into lower reservoir through the gas expansion power in the draft tube, forms partial cavity position at the unit section, specifically indicates:
firstly, putting a speed regulator to provide a power source for valve operation;
then a mechanical braking device is put into the water drainage device to prevent the unit from creeping in the water drainage process;
and finally, closing the exhaust valve and opening the inflation valve to enable high-pressure gas to be filled into the unit tail water pipe, extruding the unit tail water out of the unit section, and delaying for 120 seconds to enable water flow to be stable.
The unit tail water accident gate falls down, cuts off rivers, and the compressed air after the inflation is got rid of to the call flow of exhausting, indicates:
terminating the water pressing flow, opening a drain valve and discharging the residual compressed air in the unit section;
and (4) delaying for 120s to close the exhaust valve, resetting the mechanical brake, stopping the speed regulator, judging that the tail water pressure of the unit is reduced to 0, and ending the one-key drainage process.
The invention has the advantages and beneficial effects that:
the pumped storage unit adopts a rapid tail water drainage mode, so that firstly, the drainage time is greatly shortened, sufficient time is provided for unit maintenance and equipment defect elimination, the available time of the equipment is effectively improved, and the pumped storage unit can fully serve a power grid. And secondly, the compressed air is used for draining water, so that a large amount of electric energy consumed by the drainage pump is saved, and especially during equipment maintenance, synchronous pressure drainage of the air tank is generally required. The compressed air which needs to be discharged is used for draining water, so that the effect of killing two birds with one stone is achieved. Thirdly, one-key operation is performed by utilizing an automatic process, so that the reliability is improved, and the operation risk is reduced.
The method for rapidly discharging tail water by one key in the pumped storage power station can improve the efficiency and the benefit of the pumped storage power station to a great extent, so that the pumped storage power station can better serve a power grid.
Drawings
In order to facilitate the understanding and practice of the present invention for those of ordinary skill in the art, the following detailed description of the present invention is provided in conjunction with the accompanying drawings and the detailed description, the following examples are provided to illustrate the present invention, but it should be understood that the scope of the present invention is not limited by the detailed description.
FIG. 1 is a diagram of a prior art drain pump;
FIG. 2 is a schematic diagram of the drainage method of the present invention;
FIG. 3 is a schematic flow diagram of the drainage method of the present invention.
In the figure: the system comprises a main
Detailed Description
The technical solution in the embodiment of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiment of the present invention. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. Other embodiments, which can be derived by one of ordinary skill in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention relates to a one-key quick tail water discharging system and a method for a pumped storage power station, wherein the water discharging mode of the invention is shown in figure 2, and figure 2 is a schematic diagram of the water discharging method of the invention.
The invention is updated and improved based on the original drainage of the drainage pump, and the further improvement is to discharge tail water in an air pressure drainage mode.
The invention relates to a one-key quick tail water discharge system for a pumped storage power station, which is characterized in that a
The invention provides a one-key rapid tail water discharge method for a pumped storage power station, which comprises the following steps:
step 1: the
Step 2: the unit tail
In the practice of the present invention, as shown in FIG. 3, FIG. 3 is a schematic flow chart of the drainage method of the present invention.
The water discharge mode of the invention is to discharge tail water by a compressed air inflation mode, and the middle pressure gas is pumped into a unit tail water pipe by a middle pressure gas system, and the tail water is pressed downwards by air pressure to be pressed into a reservoir direction. At this time, the
The relevant constants of the present invention are selected as follows:
according to boyle-martial's law, a certain amount of gas is inversely proportional to pressure at isothermal temperatures (negligible temperature effect in the same environment). Calculating the required inflation quantity according to the pressure of the compressed air and the pressure after gas expansion: and (3) the expanded gas pressure = downstream reservoir water pressure, and the inflation time is determined according to the expanded gas pressure = downstream reservoir water pressure, and is generally 12-20 s.
The exhaust time is generally selected to be 30s, and manual exhaust valves are manually kept at the opening position for ensuring safety.
The automatic process of the invention comprises the following steps:
in order to realize the automation of the drainage process, a monitoring automatic process control mode is adopted, and the control process is automatically executed according to the steps shown in figure 3, and comprises the following steps:
firstly, a command is put into a speed regulator to provide a power source for valve operation;
then a mechanical braking device is put into the water drainage device to prevent the unit from creeping in the water drainage process;
closing the exhaust valve and opening the charging valve to enable high-pressure gas to be charged into the unit tail water pipe, extruding the unit tail water out of the unit section under the action of expansion force and gravity of the gas, and delaying for 120 seconds to enable water flow to be stable;
and closing the unit tail water accident gate, wherein the unit section forms a cavity area at the moment.
And stopping the water pressing flow, opening a drain valve, and discharging the residual compressed air in the unit section, wherein the tail water accident gate is closed, so that water cannot flow back to the unit section, and the purpose of tail water drainage is realized.
And (4) delaying for 120s to close the exhaust valve, resetting the mechanical brake, stopping the speed regulator, judging that the tail water pressure of the unit is reduced to 0, and ending the one-key drainage process.
Those of ordinary skill in the art will understand that: the discussion of any embodiment above is meant to be exemplary only, and is not intended to intimate that the scope of the disclosure, including the claims, is limited to these examples; within the idea of the invention, also features in the above embodiments or in different embodiments may be combined, steps may be implemented in any order, and there are many other variations of the different aspects of the invention as described above, which are not provided in detail for the sake of brevity.
The embodiments of the invention are intended to embrace all such alternatives, modifications and variances that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, substitutions, improvements and the like that may be made without departing from the spirit and principles of the invention are intended to be included within the scope of the invention.
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