CN111411660A - Technical water supply system of large-scale unit - Google Patents
Technical water supply system of large-scale unit Download PDFInfo
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- CN111411660A CN111411660A CN202010358299.3A CN202010358299A CN111411660A CN 111411660 A CN111411660 A CN 111411660A CN 202010358299 A CN202010358299 A CN 202010358299A CN 111411660 A CN111411660 A CN 111411660A
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 321
- 238000004891 communication Methods 0.000 claims abstract description 22
- 238000010926 purge Methods 0.000 claims description 18
- 238000009434 installation Methods 0.000 claims description 12
- 238000010276 construction Methods 0.000 claims description 7
- 238000000034 method Methods 0.000 claims description 5
- 238000000926 separation method Methods 0.000 claims description 2
- 238000012423 maintenance Methods 0.000 claims 1
- 238000010248 power generation Methods 0.000 abstract description 2
- 238000009412 basement excavation Methods 0.000 description 4
- 239000010813 municipal solid waste Substances 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 230000002265 prevention Effects 0.000 description 3
- 239000000498 cooling water Substances 0.000 description 2
- 238000002955 isolation Methods 0.000 description 2
- 239000008400 supply water Substances 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 230000001050 lubricating effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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Classifications
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- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03B—INSTALLATIONS OR METHODS FOR OBTAINING, COLLECTING, OR DISTRIBUTING WATER
- E03B1/00—Methods or layout of installations for water supply
- E03B1/02—Methods or layout of installations for water supply for public or like main supply for industrial use
-
- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03B—INSTALLATIONS OR METHODS FOR OBTAINING, COLLECTING, OR DISTRIBUTING WATER
- E03B11/00—Arrangements or adaptations of tanks for water supply
- E03B11/10—Arrangements or adaptations of tanks for water supply for public or like main water supply
- E03B11/16—Adaptations of devices for putting pumping plants in and out of operation, e.g. automatic control devices
-
- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03B—INSTALLATIONS OR METHODS FOR OBTAINING, COLLECTING, OR DISTRIBUTING WATER
- E03B7/00—Water main or service pipe systems
- E03B7/07—Arrangement of devices, e.g. filters, flow controls, measuring devices, siphons or valves, in the pipe systems
- E03B7/078—Combined units with different devices; Arrangement of different devices with respect to each other
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- Engineering & Computer Science (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Public Health (AREA)
- Water Supply & Treatment (AREA)
- Structural Engineering (AREA)
- Pipeline Systems (AREA)
Abstract
The invention relates to a technical water supply system of a large unit. The invention aims to provide a technical water supply system of a large-scale unit so as to ensure the reliability, safety and operation flexibility of the large-scale unit and power generation equipment thereof. The technical scheme of the invention is as follows: a technical water supply system of a large-scale unit is characterized in that: a unit water supply system and a main transformer water supply system are respectively arranged corresponding to the unit and the main transformer; the water supply systems of the adjacent units are communicated through a unit communication water supply main pipe, and a unit electric valve is arranged on the unit communication water supply main pipe; the main transformer water supply systems of adjacent main transformers are communicated through a main transformer communication water supply main pipe, and main transformer electric valves are arranged on the main transformer communication water supply main pipe. The invention is suitable for the field of water conservancy and hydropower engineering.
Description
Technical Field
The invention relates to a technical water supply system of a large unit. Is suitable for the field of water conservancy and hydropower engineering.
Background
With the improvement of the technology of the Chinese water conservancy and hydropower engineering, the technology of the hydroelectric generating set is greatly improved in China, the hydroelectric generating set with higher single-machine power can be designed and manufactured, the capacity of the recently designed hydroelectric generating set reaches 1000MW and is at the head of the world hydropower. While the unit technology and capacity increase, the design of water supply systems for cooling and lubricating the unit and its transmission transformer (e.g., main transformer) also faces problems. Mainly comprises the following steps:
1. in the past, a single water pump is adopted to supply water for a unit and a main transformer simultaneously, but with the increase of the capacity of a single machine, a technical water supply pump with larger capacity needs to be adopted, and the power of a corresponding matched motor also needs to be increased. The self-powered system of a common unit adopts a low-voltage power supply system, the power of a matched motor of a technical water supply pump of a large-capacity unit reaches the limit position, a proper pump set cannot be selected, the distance between a unit section and a main transformer chamber is longer than that of the conventional engineering at the same time, and the hydraulic losses of the unit section and the main transformer chamber are different.
2. Because the capacity of the unit and the main transformer configured by the unit is large, although in the past projects, each unit and the main transformer are configured with two water pump water supply systems, most managers still consider that more pump groups need to be configured to ensure that more reliable technical water supply sources can be provided for the unit and the main transformer compared with the position of the unit in a power grid system. Technical water supply pump package between adjacent unit can each other be reserve water source, because water supply route and pipe diameter are different, the difficult matching of water pump parameter even if realized the water supply of adjacent unit reserve, but because the boundary condition difference is great, brought great hidden danger to the stability operation safety of water pump.
3. The water supply amount of the large-capacity unit is large, and the selected technical water supply pipeline has large caliber and large quantity; typically, the technical water intake and discharge openings are provided in the side walls of the tailrace tunnel, which necessitates an enlarged excavation of the side walls of the tailrace tunnel where the water intake is located. As the section size of the tail water tunnel is larger, other caverns are arranged for the tail water tunnel with poor geological conditions, and the expanding excavation is carried out on the basis, so that the stability of the caverns is very unfavorable.
4. At present, compressed air purging interfaces are arranged on exposed pipe sections of technical water supply pipelines for dredging and purging large-caliber water inlets on water supply pipelines of large-scale units, as a purging gas source is far away from the water inlets of the technical water supply systems, and the diameter of a compressed air purging pipe orifice is small and is generally one tenth of that of the technical water supply pipelines, the ratio of the caliber of the compressed air purging pipe to a trash rack is smaller, when the trash rack at the water inlet is not completely blocked, the pressure of the compressed air is reduced more when the compressed air used for purging is sent to the trash rack at the water inlet through the technical water supply pipelines, and the impurities on the trash rack at the water inlet cannot be cleaned.
5. When the water turbine generator set is shut down, the power system needs to provide power support for a plant power system of a power station through the large main transformer, meanwhile, when the water turbine generator set is shut down, cooling water supply of the main transformer of the unit needs to be drained to a technical water supply unit where an adjacent main transformer is located, and due to the fact that the water quantity and the path are long, the operation parameters of a water pump of the technical water supply hydraulic unit where the adjacent main transformer is located are greatly changed.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: aiming at the existing problems, the technical water supply system of the large-scale unit is provided to ensure the reliability, the safety and the operation flexibility of the large-scale unit and the power generation equipment thereof.
The technical scheme adopted by the invention is as follows: a technical water supply system of a large-scale unit is characterized in that: a unit water supply system and a main transformer water supply system are respectively arranged corresponding to the unit and the main transformer;
the water supply systems of the adjacent units are communicated through a unit communication water supply main pipe, and a unit electric valve is arranged on the unit communication water supply main pipe;
the main transformer water supply systems of adjacent main transformers are communicated through a main transformer communication water supply main pipe, and main transformer electric valves are arranged on the main transformer communication water supply main pipe.
The unit water supply system and the main transformer water supply system are both provided with two water taking ports, two water taking header pipes and an overhaul valve, and the two water taking header pipes are connected with the two pump sets in a one-to-one correspondence manner.
The water supply system of the unit is provided with two sets of water supply pump sets, water inlets of the two sets of water supply pump sets are respectively communicated with two water intake ports of the water supply system of the unit through water intake pipelines of the unit, the two water intake ports are arranged in an upper layer and a lower layer, water outlets of the two sets of water supply pump sets are connected with the unit through a water supply and drainage pipeline of the unit together, and a check valve is arranged on the water supply and drainage pipeline; the unit water supply pipes of two adjacent unit water supply systems are communicated through the unit communication water supply main pipe;
the main transformer water supply system is provided with two groups of main transformer water supply pump sets, two water intake ports are arranged in an upper layer and a lower layer, water intake ports of the two main transformer water supply pump sets are respectively communicated with the two water intake ports of the main transformer water supply system through main transformer water intake pipelines, water outlet ports of the two groups of main transformer water supply pump sets are jointly connected with main transformers through a main transformer water supply and drainage pipeline, and a check valve is arranged on the water supply and drainage pipeline; the main transformer water supply pipes of two adjacent main transformer water supply systems are communicated through the main transformer communication water supply main pipe.
And the water intake ports of the unit water supply system and the main transformer water supply system are arranged in a construction channel used for excavating a tailwater tunnel in the earlier stage.
The air supply system is provided with a purging air supply pipeline, and a purging port of the purging air supply pipeline is aligned with water inlets of the unit water supply system and the main transformer water supply system.
The method comprises the following steps that an upper equipment installation layer and a lower equipment installation layer of a space separation layer beside a main power plant unit section are arranged, and equipment and pipelines of a unit water supply system and a main transformer water supply system are respectively arranged on the upper equipment installation layer and the lower equipment installation layer.
The invention has the beneficial effects that:
(1) the unit and the main transformer water supply system are respectively arranged to reduce the capacity of a motor of the technical water supply pump, and can be started successively, so that the impact of the water supply pump on service power during starting is reduced, the operation flexibility of the technical water supply system is increased, the interference of water distribution among equipment is reduced, and the operation stability of the technical water supply system is improved;
(2) according to the height difference condition of a pump room of a factory building, a unit technical water supply pump and a main transformer water supply pump are respectively arranged in two layers, so that the excavation length of the factory building is reduced; the pipelines have clear trend, so that the mutual interference of the pipelines is avoided;
(3) the water supply system is provided with the double water taking ports and the double water taking pipelines, so that the problem of operation stability when the water pumps are standby mutually is solved, and the reliability of the water supply system is improved; the construction channel arrangement of the tail water tunnel of the power station is combined, so that the collapse risk of the tail water tunnel during excavation is reduced, and the utilization efficiency of an excavated cavern is improved;
(4) the two water supply connection header pipes are arranged to respectively connect all unit technical water supply pipelines and all main transformer water supply pipelines of the power station, so that the water supply standby of an adjacent unit technical water supply system and the water supply standby of an adjacent main transformer technical water supply system can be realized, the electric valves are arranged on the connection header pipes, the normal operation is respectively isolated, and the reliability of the single-machine operation is improved;
(5) the purging air supply pipeline from the water intake to the main workshop is arranged, the purging port is directly aligned to the water intake, and the risk of blockage of the water intake is reduced.
Drawings
Fig. 1 is a schematic diagram of the present embodiment.
In the figure: 1. a water intake; 2. a tailwater tunnel; 3. a unit water supply pump set; 4. a unit water supply pipe; 5. a water taking pipeline of the unit; 6. a four-way valve; 7. a main transformer electric valve; 8. a main transformer water supply pipe; 9. a main transformer water supply pump set; 10. purging the gas supply line; 11. a main transformer water taking pipeline; 12. (ii) a 13. A water supply and drainage pipe of the machine set; 14. main transformer drain pipe.
Detailed Description
The embodiment is a technical water supply system of large-scale unit, and it is equipped with unit water supply system to correspond the unit, corresponds the main water supply system that becomes that is equipped with, and the main unit contact water supply house steward intercommunication of having unit electric valve between the unit water supply system of adjacent unit through taking, and the main water supply system that becomes adjacent main changes is through the main contact water supply house steward 8 intercommunication that becomes main electric valve 7 that becomes between the main water supply system that becomes, makes each other between the adjacent unit water supply system reserve the water source for each other, and each other is reserve the water source between.
The unit water supply system has two water intakes 1 in this embodiment, all sets up in being used for excavating in the construction passageway of tailwater tunnel 2 in earlier stage with tailwater tunnel 2 together. The unit water supply system in the embodiment comprises two sets of unit water supply pump sets 3, water inlets of the two sets of unit water supply pump sets 3 are respectively communicated with two water intake ports 1 of the unit water supply system through a unit water intake pipeline 5, water outlets of the two sets of unit water supply pump sets 3 are connected with the unit through a unit water supply and drainage pipe 13 together, the unit and the unit water supply and drainage pipe 13 are arranged to a water outlet of another construction channel communicated with the tail water tunnel 2, and the unit water supply and drainage pipe 13 is provided with a check valve and an isolation valve for backflow prevention and backflow prevention.
In this example, a four-way valve 6 is connected to the unit water supply pipe 4, the unit water supply pipe 4 is respectively communicated with the unit water supply pipes 4 on the left and right adjacent unit water supply systems through the four-way valve 6, and the unit water supply pipe is communicated with the four-way valve 6 on the left and right adjacent unit water supply systems through a main transformer communication water supply header pipe with a main transformer electric valve 7 between the four-way valve 6 on the unit water supply pipe and the four-way valve 6 on the.
The main water supply system that becomes in this embodiment has two water intakes 1, all sets up in the construction passageway that is used for excavating tail water tunnel 2 in earlier stage with tail water tunnel 2 together. The main transformer water supply system in this example has two groups of main transformer water supply pump sets 9, the water inlets of the two main transformer water supply pump sets 9 are respectively communicated with two water intake ports 1 of the main transformer water supply system through a main transformer water intake pipeline 11, the water outlets of the two groups of main transformer water supply pump sets 9 are commonly connected with a main transformer through a main transformer water supply pipe 8, the main transformer and the main transformer water discharge pipe 14 are discharged to a water discharge port where another construction channel communicated with a tail water tunnel 2 is located, and the main transformer water discharge pipe 14 is provided with a check valve and an isolation valve for backflow prevention.
In this example, a four-way valve 6 is connected to a main-transformer water supply pipe 8, the main-transformer water supply pipe 8 is respectively communicated with the main-transformer water supply pipes 8 on the adjacent main-transformer water supply systems on the left side and the right side through the four-way valve 6, and the main-transformer water supply pipes are communicated with the four-way valves 6 on the adjacent main-transformer water supply systems on the left side and the right side through a main-transformer communication water supply header pipe with a main-transformer electric valve.
In the embodiment, the purging air supply pipeline 10 extending from the main plant to the water intake 1 is provided, and the purging port of the purging air supply pipeline is directly aligned with the water intake 1, so that the possibility of blockage of the water intake 1 is reduced.
In the embodiment, the concrete space beside the main plant unit section is isolated into an upper equipment installation layer and a lower equipment installation layer on the upper elevation difference, and the upper equipment installation layer is provided with the equipment and the pipelines of the main transformer water supply system; the lower installation layer is provided with equipment and pipelines of a unit water supply system.
In this embodiment, the unit and the main transformer are respectively provided with the water supply system, so that the safety of users can be ensured respectively, the unit and the main transformer can be started respectively, the intercrossing procedure of the unit and the main transformer on the operation procedure can be simplified, the impact on the plant power system which supplies power to the water supply system when the water supply pump set is started is reduced, and the safety of plant power is ensured.
The unit and the main transformer water supply system are provided with two water taking ports 1 and two water taking pipelines which can be mutually standby, so that the clogging of the pipelines is reduced to the greatest extent, and the water supply system is in failure; directly sweep the mouth that sweeps of air supply line 10 on water intaking mouth 1, when guaranteeing that water intaking mouth 1 to appear blockking up, can guarantee that there is the air supply of sufficient pressure directly to send to water intaking mouth 1, realize the clearance of water intaking mouth 1, reinforcing clearance effect. The drain pipe is provided with a check valve which has the function of ensuring that the pipeline does not flow off when the vacuum flow off occurs on the drain pipeline with low water level at the downstream of the drain pipeline; when the drain pipe damaged, the tail water has the pressurized water can end in the pipeline, can prevent to follow the tail water that the drainage pipe directly links and can not flow backward to the main building, can guarantee the safety of main building.
In the embodiment, the unit and main transformer water supply system is provided with two water intake ports 1 and two water intake pipelines, a communication water supply main pipe is arranged between adjacent units or main transformer water supply systems, and an electric valve is arranged on the main pipe; when the unit or the main transformer needs to supply water by a standby water source, an electric valve on the communication water supply main pipe can be opened; and starting the other water supply pump set of the unit or the main transformer water supply system, supplying water through the two water taking pipelines respectively, and supplying water to the two generator sets or the main transformer through the communication water supply main pipe.
In the operation process, water is respectively taken through the two water taking pipes, water sources are respectively provided for the two adjacent units or the main transformer through different water supply pump sets and are respectively discharged to respective water supply pipes, the water supply paths are basically the same, the operation working conditions and parameters of the water supply pump sets are basically the same, the operation range of the water pump is reduced, stable cooling water volume is provided for the units or the main transformer, and the stability of a water supply system of the units or the main transformer is improved.
In this embodiment, a water supply pump set of one unit or main transformer can provide a standby water source for a left unit or main transformer adjacent to the water supply pump set, and can also provide a standby water source for a right unit or main transformer adjacent to the water supply pump set; the pump set equipment for providing a spare water source for the unit or the main transformer is sufficient in quantity, and the spare water pressure and the spare water quantity are basically the same.
When the water supply systems of the unit or the main transformer do not need to be mutually standby, the electric valve on the contact water supply main pipe is closed, and the independent and stable operation of the water supply systems of the unit or the main transformer can be realized.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (7)
1. A technical water supply system of a large-scale unit is characterized in that: a unit water supply system and a main transformer water supply system are respectively arranged corresponding to the unit and the main transformer;
the water supply systems of the adjacent units are communicated through a unit communication water supply main pipe, and a unit electric valve is arranged on the unit communication water supply main pipe;
the main transformer water supply systems of adjacent main transformers are communicated through a main transformer communication water supply main pipe, and main transformer electric valves are arranged on the main transformer communication water supply main pipe.
2. Technical water supply system for large units according to claim 1, characterized in that: the unit water supply system and the main transformer water supply system are both provided with two water taking ports, two water taking main pipes and a maintenance valve; the two water taking main pipes are connected with the two pump sets in a one-to-one correspondence manner.
3. Technical water supply system for large units according to claim 2, characterized in that:
the water supply system of the unit is provided with two sets of water supply pump sets, the water inlets of the two sets of water supply pump sets are respectively communicated with two water intake ports of the water supply system of the unit through two water intake pipelines of the unit, the two water intake ports are arranged in an upper layer and a lower layer, the water outlets of the two sets of water supply pump sets are connected with the unit through a water supply and drainage pipeline of the unit together, and a check valve is arranged on the water supply and drainage pipeline; the unit water supply pipes of two adjacent unit water supply systems are communicated through the unit communication water supply main pipe;
the main transformer water supply system is provided with two main transformer water supply pump sets, water inlets of the two main transformer water supply pump sets are respectively communicated with two water intake ports of the main transformer water supply system through two main transformer water intake pipelines, the two water intake ports are arranged in an upper layer and a lower layer, water outlets of the two main transformer water supply pump sets are jointly connected with a main transformer through a main transformer water supply and drainage pipeline, and a check valve is arranged on the water supply and drainage pipeline; the main transformer water supply pipes of two adjacent main transformer water supply systems are communicated through the main transformer communication water supply main pipe.
4. Technical water supply system for large units according to claim 1 or 2 or 3, characterized in that: and the water intake ports of the unit water supply system and the main transformer water supply system are arranged in a construction channel used for excavating a tailwater tunnel in the earlier stage.
5. Technical water supply system for large units according to claim 4, characterized in that: the air supply system is provided with a purging air supply pipeline, and a purging port of the purging air supply pipeline is aligned with water inlets of the unit water supply system and the main transformer water supply system.
6. Technical water supply system for large units according to claim 1, characterized in that: the method comprises the following steps that an upper equipment installation layer and a lower equipment installation layer of a space separation layer beside a main power plant unit section are arranged, and equipment and pipelines of a unit water supply system and a main transformer water supply system are respectively arranged on the upper equipment installation layer and the lower equipment installation layer.
7. Technical water supply system for large units according to claim 1 or 2 or 3 or 4, characterized in that:
the closing of the unit electric valve is arranged on the unit contact water supply main pipe communication, so that the unit water supply systems of the adjacent units are communicated or isolated through the unit contact water supply main pipe, and the water supply of the unit water supply system of the unit is supplied to the adjacent unit water supply systems;
be equipped with on this main transformer contact water supply main on the intercommunication and become the electric valve and open or close, realize that this unit water supply system supplies water to adjacent unit water supply system through main transformer contact water supply main intercommunication between the main transformer water supply system that realizes adjacent main transformer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010358299.3A CN111411660A (en) | 2020-04-29 | 2020-04-29 | Technical water supply system of large-scale unit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010358299.3A CN111411660A (en) | 2020-04-29 | 2020-04-29 | Technical water supply system of large-scale unit |
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| CN111411660A true CN111411660A (en) | 2020-07-14 |
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| CN202010358299.3A Pending CN111411660A (en) | 2020-04-29 | 2020-04-29 | Technical water supply system of large-scale unit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113433978A (en) * | 2021-07-01 | 2021-09-24 | 华能国际电力股份有限公司上安电厂 | Unit water supply control system optimization method |
-
2020
- 2020-04-29 CN CN202010358299.3A patent/CN111411660A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113433978A (en) * | 2021-07-01 | 2021-09-24 | 华能国际电力股份有限公司上安电厂 | Unit water supply control system optimization method |
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